CN101301694B - Saws with dust-collecting devices - Google Patents

Abstract

The present invention provides dust collection device and saw and bench saw with dust collection device. The dust collection device includes: entrance member, with axis; Ontology, which defines the dust collecting chambers being connected with the entrance member; Attachment device is arranged and configured to the entrance member being connected to the ontology, and the entrance member can be pivoted relative to the ontology around pivotal axis in scheduled angular range as a result, which is approximately perpendicular to the axis of the entrance member.

Description

Saws with dust collection device

This application is a divisional application of an invention patent application whose applicant is Makita Co., Ltd., whose application date is July 18, 2005, and whose application number is 200510087607.9, and whose invention title is "dust collection device and cutting device with dust collection device". the

technical field

The present invention relates to a dust collection device for collecting dust, such as cutting chips, generated during a cutting operation of a cutting device. The invention also relates to saws and table saws with such a dust collection device. the

Background technique

Japanese Patent Laid-Open No. 10-180713 teaches a known cutting device configured as a table saw and having a dust collecting device. The dust collection device has a duct and a dust collection bag. One end of the conduit is attached to the blade cover used to cover the circular saw blade of the table saw. A dust collection bag is attached to the other end of the conduit. A fan is provided in the duct so that the air blowing force generated by the fan plus the air blowing force generated by the rotating saw blade can send cutting chips generated during the cutting operation of the saw blade into the dust collection bag. Dust collection bags are generally made of fabric. Thus, the mesh of the fabric separates the cut debris from the air, which collects the cut debris in the dust collection bag. the

However, during the long-term use of the dust collecting device, the mesh of the fabric may be clogged with cut debris. As a result, air is prevented from passing through the dust collection bag. Thus, the dust collection efficiency will be reduced. the

Additionally, to dispose of cutting debris, it is necessary to tap the dust collection bag to dislodge or remove the dust that clogs the mesh. This may cause cutting debris to fly through the air. It is therefore not possible to cleanly dispose of the cutting chips. the

In addition, in order to compensate for the reduction in collection efficiency, a fan is required to provide external force for the blowing force generated by the rotating saw blade. the

In addition, the table saw of Japanese Patent Application Laid-Open No. 10-180713 is equipped with a table top and a saw part that can rotate vertically relative to the table top. The dust collection bag is connected to the blade cover through a cylindrical tubular mounting portion provided on the rear side of the blade cover. US Patent No. 6,289,778 also teaches the same structure. the

However, according to this configuration, the dust collection bag extends rearwardly from the blade cover. Thus, when the saw unit is rotated downward to perform the cutting operation, the dust collection bag moves upwardly against the movement of the saw unit, so that the rear end of the dust collection bag extends upwardly. Additionally, after the cutting operation is complete, the saw unit may remain in the downwardly rotated position for transport or storage at a predetermined location. Difficult to handle table saws with dust collection bags extending upwards. In addition, in order to store the table saw, it is necessary to ensure a storage space with a large height. These difficulties can be resolved by removing the dust collection bag from the table saw. However, in various situations where table saws are stored, the operation of removing the dust collection bag is cumbersome. In addition, the operation of disposing of the collected cutting chips is also cumbersome in various situations where table saws are stored. the

Contents of the invention

It is therefore an object of the present invention to teach an improved dust collection device capable of effectively collecting dust. Another object is to teach an improved saw with such a dust collection device. the

According to one aspect of the teachings of the present invention, a dust collection device for collecting cutting debris produced by a cutting device is taught. The dust collection device includes a separator for separating the cutting chips from the carrier air by using the gravity of the cutting chips. A dust container or dust collector collects the cut debris separated by the separator. The separator includes a separator body having a cut debris discharge pipe and an exhaust pipe. The separated carrier air is discharged upwards from the separator body through the exhaust pipe. The separated cut chips are discharged downward from the separator main body through the cut chip discharge pipe. The dust container is connected to the cut debris discharge pipe of the separator. the

Thus, the separator uses gravity to separate the cut debris from the carrier air. The separated cut pieces can be collected in a dust container. Dust collection efficiency can be improved since there is no need to use a fabric bag filter that may become clogged with cut debris during prolonged use. In addition, the cut pieces can be disposed of cleanly because there is no need to tap the fabric bag to remove clogged cut pieces as is required in the prior art. the

According to one embodiment, the separator body has an inlet duct such that cutting chips enter the separator body with the carrier air through the inlet duct. The position of the inlet pipe is offset from the central axis of the separator body so that the cut debris entering the separator body through the inlet pipe moves downwards towards the cut debris discharge pipe under the force of gravity, while the cut debris travels along the separator body within the separator body The inner wall of the body rotates in the circumferential direction. the

According to this arrangement, the cutting chips are forced to move towards the inner wall of the separator body as they rotate within the separator body. This effectively separates the cutting chips from the carrier air by centrifugal force in addition to gravity. In other words, the separator is configured as a cyclone. the

According to another aspect of the teachings of the present invention, a cutting device comprising a dust collecting device is taught. The cutting device may include a cutting tool, a cover covering the cutting tool, and a conduit connected between the cover and the dust collection device, so that cutting chips generated by the cutting tool are sent from the cover to the dust collection device together with carrying air. the

According to one embodiment, the cutting tool is a circular saw blade. In addition, the cutting tool also includes a motor that rotates the circular saw blade so that the rotating circular saw blade generates a flow of carrying air that is blown into the conduit through the cover together with cutting chips generated by the circular saw blade. the

According to another embodiment, the cutting device further includes a tool part having a cutting tool and a cover, a base mounted on the worksite floor, and a slider slidable relative to the base. Tool parts and separators are mounted on the slide. the

With this arrangement, the separator can move with the cover as the tool part slides relative to the base. In this way, the positional relationship between the separator and the cover does not change during the sliding of the tool part. Therefore, the sliding of the tool part does not unduly bend the conduit connected between the cover and the separator. This allows the cut pieces to be fed smoothly into the separator. the

According to yet another embodiment, the dust container is removably mounted on the slide. According to this arrangement, it is easy to dispose of the cutting chips from the dust container after the dust container has been removed from the slide. the

According to a further embodiment, the cutting device further comprises a motor driving the cutting tool and a fan generating an air flow for cooling the motor. A suction pipe is connected between the upstream side of the fan and the exhaust pipe of the separator body. In this way, the air in the separator body can be sucked from the separator body by negative pressure generated by the fan. As a result, the air pressure within the separator body will drop, enabling effective suction of cutting debris from the side of the cutting tool via the cover and conduit. the

According to another aspect of the teachings of the present invention, a saw is taught that includes a rotating circular saw blade, a cover covering the saw blade, and a dust collection device connected to the cover such that the cutting debris is carried along with the flow of air carried by the saw blade as it rotates within the cover. sent to the dust collection device. The dust collection device includes a first dust collector, a cyclone unit, and a second dust collector. The first dust collector defines a first dust collection chamber and is used to collect at least a portion of cutting debris, such as large and heavy cuts, which are fed in from one side of the saw blade together with the carrying air and fall into the first dust collection chamber under the action of gravity. debris. The cyclone unit receives the carrier air and the remaining flow of cutting debris, which was not collected in the first dust collector. The main body of the cyclone is used to make the cutting debris rotate along the circumference of the inner wall with the carrying air, while the cutting debris falls under the action of gravity. The separated carrier air is discharged upwards from the main body of the cyclone through the exhaust pipe. The separated cutting chips are discharged downward from the main body of the cyclone through the cutting chip discharge pipe. The second dust collector defines a second dust collection chamber and is connected to the cutting debris discharge pipe of the cyclone main body, so that the cutting debris discharged from the cutting debris discharge pipe is collected in the second dust collection chamber. the

According to this arrangement, the first dust collector can collect large and heavy cutting chips. Small and light cutting chips not collected by the first dust collector can be sent to the cyclone unit, where the cutting chips are separated from the carrier air by gravity and centrifugal force, and then sent to and collected in the second dust collector . This allows efficient collection of cut debris without the use of prior art fabric bag filters. the

According to one embodiment, the saw further comprises an adjustment device for adjusting the position of the dust collection device relative to the cover. This enables the position of the dust collection device to be adjusted to properly collect the cut debris. For example, the angular position of the dust collection device can be adjusted such that the cyclone unit can effectively separate the cutting chips. the

According to another embodiment, the dust collecting device is vertically rotatably mounted on the cover. The adjustment means is operable to adjust the vertical rotation angle of the dust collection means relative to the cover. the

According to a further embodiment, the saw further includes a base vertically rotatably supporting the cover between an uppermost position and a lowermost position. The adjusting device adjusts the relative vertical angle between the cover and the dust collecting device, so that the relative vertical angle when the cover is in the uppermost position or the uppermost position is smaller than that when the cover is in the lowermost position or the lowermost position. the

In this way, the cover can be moved to the uppermost or uppermost position without interference from the dust collection device, since the dust collection device can be rotated to reduce the relative vertical angle. On the contrary, when the cover is moved to the lowermost position or the lowermost position, a larger relative angle can be ensured between the dust collecting device and the cover. This prevents the cyclone unit from being tilted too much relative to the vertical. As a result, the separation efficiency of the inclined unit can be better maintained. the

According to a further embodiment, the adjusting means comprises a limiting means and a supporting means. Restricting means prevents relative rotational movement between the cover and the dust collecting means so that the dust collecting means rotates with the cover when the cover is rotated downwardly from an intermediate position between the lowermost position and the uppermost position. When the cover rotates upwards from the middle position, the supporting device is used to support the dust collecting device at a predetermined position relative to the base, such as a horizontal position, against gravity. the

According to yet another embodiment, the dust collecting device further includes a single bottom cover defining the bottom of the first and second dust collecting chambers. Opening the bottom cover can simultaneously discharge the cutting chips collected in the first and second dust collection chambers at one time. the

According to yet another embodiment, the first dust collector defining the first dust collecting means has a front portion detachably connected to the cover, and the front portion has a narrower width than the remaining portion. According to this arrangement, it is easier for the operator to hold the narrower width front portion in order to connect and disconnect the dust collection device to the cover. the

According to yet another embodiment, the first dust collector defining the first dust collecting means has engaging grooves formed on lateral sides, said engaging grooves being adjacent to and extending along the upper edge of the first dust collector, thereby An operator can hold the dust collection device with fingers that cooperate with these slots. According to this arrangement, the operator can firmly hold the dust collection device after the collection device has been removed from the cover. The engaging groove is preferably formed at a position substantially corresponding to the center of gravity of the dust collecting device. the

According to yet another aspect of the present teachings, a table saw is taught that includes a table top, a saw component, a dust collection device, and an attachment device. The table defines a surface for seating a workpiece. The saw unit is vertically rotatably mounted on the table, and includes a saw blade and a cover for covering the saw blade. The dust collection device is used to collect cutting debris produced by the saw blade during the cutting operation of the workpiece. The attachment means vertically rotatably attaches the dust collecting means to the saw part. the

According to this arrangement, the position of the dust collection device can be kept independent of the vertical position of the saw unit. For example, the dust collection device can be positioned in the lowest position, while the saw unit is also positioned in the lowest position. This makes it easier to transport the table saw with dust collection to the designated location. In particular, it is convenient to store the table saw in a storage space with a relatively small height. the

According to one embodiment, the saw blade is a rotary saw blade and the cover has a discharge tube connected to the cover. The cutting chips produced by the saw blade are blown into the discharge duct together with the flow of carrying air produced by the rotating saw blade. The connection means includes an inlet pipe member rotatably mounted on the dust collection device, the pipe member having a first end connected to the discharge pipe and a second end leading to the dust collection chamber. the

According to another embodiment, the connection means is configured for connection to the dust collection device such that the dust collection device can rotate freely relative to the saw part under the force of gravity. According to this arrangement, the dust collecting device can normally be kept in the lowermost position under the action of gravity. the

According to a further embodiment, the connecting means are adapted to be connected to the dust collecting device such that the dust collecting device can be rotated relative to the saw part within a limited rotational range. Furthermore, a retaining device temporarily holds the dust collecting device in an intermediate position within a limited rotational range. the

According to this arrangement, when the dust collecting device is held in the neutral position, the dust collecting device can rotate vertically together with the saw part, for example during a rotary movement of the saw part during a cutting operation. This enables the dust collection device to be positioned in such a way that the dust collection device can effectively collect the cutting debris. Releasing the retainer allows the dust collection device to rotate downward under the force of gravity, thereby holding the dust collection device in the lowest position for transport or storage. the

According to another embodiment, the table saw further includes a restricting member for supporting the dust collecting device from a lower side to restrict a lower pivot end of the dust collecting device. According to this arrangement, it is possible to prevent the dust collecting device from affecting other elements, such as the movable element, in particular the sliding support of the saw part. This prevents the dust collecting device and the restraint from being damaged. the

According to yet another embodiment, the support means mounted on the table supports the saw unit so as to be vertically rotatable and horizontally movable. Restrictions are mounted on the support means. the

According to another embodiment, the limiting member elastically supports the dust collecting device from the underside against the force of gravity. This absorbs potential shocks or vibrations applied to the dust collecting device when the dust collecting device is moved to the lowermost position. Therefore, generation of impact sound or vibration sound can be prevented or minimized. the

According to another embodiment, a rolling member is provided on the restricting member, so that the restricting member comes into contact with the dust collecting means through the rolling member. According to this arrangement, it is possible to ensure smooth movement of the dust collecting device in the horizontal direction in response to the vertical rotational movement of the saw unit. In this way, the possible damage to the dust collecting device and the limiting member can be further reduced, thereby improving the durability of the dust collecting device. the

According to another aspect of the present teachings, a table saw is taught that includes a table top, a saw component, and a dust collection device. The table defines a surface for seating a workpiece. The saw unit is vertically and laterally rotatably mounted on the table, and includes a rotatable circular saw blade and a housing for covering the saw blade. The dust collection device is mounted on the saw part and includes a first dust collector, a cyclone unit and a second dust collector assembled with each other. The first dust collector defines a first dust collection chamber and is connected to the cover such that cutting debris generated by the saw blade during a cutting operation is fed into the first dust collection chamber together with the flow of carrying air and is partially collected by gravity In the first dust collection chamber. The cyclone unit receives cutting chips carried by the air and not collected in the first dust collection chamber. The cyclone unit includes a cyclone main body, a cutting debris discharge pipe and an exhaust pipe. The cyclone body has an inner wall and is arranged and constructed such that the cutting debris rotates with the carrying air along the circumference of the inner wall while the cutting debris descends under the force of gravity. The separated carrier air is discharged upwards from the main body of the cyclone through the exhaust pipe. The separated cutting chips are discharged downward from the main body of the cyclone through the cutting chip discharge pipe. The position of the cyclone unit is determined such that the cyclone unit moves to the upper side of the first dust collection chamber when the saw unit is laterally rotated in one direction together with the dust collection device. the

According to this arrangement, the first dust collector collects large and heavy cutting chips, and the second dust collector can collect small and light cutting chips separated by the cyclone unit using gravity plus centrifugal force. In addition, since the cyclone unit moves to the upper side of the first dust collection chamber when the saw unit rotates laterally in one direction together with the dust collection device, cutting chips collected in the first dust collection chamber do not move to the cyclone unit. In this way cutting debris is effectively collected even when the saw unit is tilted laterally in order to perform an oblique cutting operation. the

According to one embodiment, the cyclone unit is positioned on a side of the first dust collection chamber opposite to the transverse direction of rotation of the saw element. the

According to another embodiment, the first dust collection chamber includes an inlet, a terminal and an outlet. The terminal is opposite the inlet in the direction of the flow of cutting debris entering the inlet, causing the cutting debris to impinge on the terminal. The outlet is provided on the lateral side of the collection chamber and is positioned at a predetermined distance from the terminal in the direction toward the inlet, thereby defining a space between the outlet and the terminal to prevent cutting chips from entering due to rebounding after impact with the terminal. exit. the

According to this arrangement, the flow of cutting chips is moderately buffered by the space between the outlet and the terminal before entering the cyclone unit. In other words, this space is used as a buffer. In this way, the cutting debris can be effectively collected in the first dust collector, and the cutting debris will not enter the cyclone unit due to the rebound force. Thus, the dust collection efficiency can be improved. the

According to one embodiment, the cross-sectional area of the first dust collection chamber increases gradually in the direction of the flow of cutting chips in the first dust collection chamber. For example, the first dust collection chamber may have a streamlined configuration. the

According to this arrangement, the air pressure of the carrying air flowing through the first dust collection chamber gradually decreases in the direction toward the outlet. In this way, the flow velocity of the cutting chips and the flow velocity of the carrier air is gradually reduced without creating turbulence in the carrier air. As a result, it is ensured that most of the cutting chips fall into the first dust collecting chamber to be collected therein. This improves the dust collection efficiency. the

According to yet another aspect of the present teachings, a circular saw is taught that includes a saw element and a dust collection device. The saw unit includes a rotatable circular saw blade and a housing for covering the saw blade. The dust collection device is connected to the saw part and includes a first dust collector, a cyclone unit and a second dust collector assembled with each other. The first dust collector defines a first dust collection chamber including an inlet, a terminal and an outlet. The terminal is opposed to the inlet in the direction in which the cutting chips flow into the inlet, so that the cutting chips collide with the terminal. The outlet is provided on the lateral side of the collection chamber and is positioned at a predetermined distance from the terminal in the direction toward the inlet, thereby defining a space between the outlet and the terminal to prevent cutting chips from entering due to rebounding after impact with the terminal. exit. the

According to this arrangement, cutting chips can also be efficiently collected by incorporating a cyclone unit. In addition, by incorporating a buffer space between the outlet and the terminal, it is also possible to efficiently collect cutting chips within the first dust collection chamber. the

Description of drawings

1 is a front view of a sliding table saw according to a first representative embodiment of the present invention;

Fig. 2 is the plan view of Fig. 1, also represented with a broken line according to a suction pipe of the table saw of the second representative embodiment;

Figure 3 is a vertical cross-sectional view of a separator body of a sliding table saw;

Figure 4 is a front view of a sliding table saw according to a third representative embodiment;

Figure 5 is a perspective view of a sliding table saw according to a fourth representative embodiment;

6 is a side view of a sliding table saw according to a fourth representative embodiment, showing the saw components when the blade cover is rotated to the lowermost position;

Figure 7 represents a side view similar to Figure 6, but showing the saw parts with the cover turned to the uppermost position;

Figure 8 is a plan view of a sliding table saw according to a fourth representative embodiment;

9 is a perspective view of a dust collection device of a sliding table saw according to a fourth representative embodiment;

Figure 10 is a side view of the dust collection device;

Fig. 11 is a sectional view extracted along line XI-XI in Fig. 10;

Figure 12 is a partially exploded perspective view of the dust collection device;

Figure 13 is an exploded perspective view of the dust collection device;

Figure 14 is a vertical cross-sectional view seen from the lateral side of the dust collection device, and shows the position of the first outer wall and the inlet piece when the saw component is in the lowermost position;

Figure 15 is a vertical cross-sectional view similar to Figure 14, but showing the position of the first outer wall and inlet piece when the saw assembly is in the uppermost position;

Fig. 16 is a side view of the dust collecting device, and represents the state that the bottom cover is opened;

17 to 19 are schematic diagrams of a sliding table saw according to a fourth representative embodiment, and show different vertical rotational positions of the saw components;

20 is a perspective view of a dust collection device of a sliding table saw according to a fifth representative embodiment;

Figure 21 is a plan view of the dust collection device shown in Figure 20;

Fig. 22 is the view of the dust collection device seen from the direction shown by arrow XXII in Fig. 21;

Figure 23 is a cross-sectional view extracted along line XXIII-XXIII in Figure 21;

Figure 24 is a cross-sectional view extracted along line XXIV-XXIV in Figure 22;

Fig. 25 is a side view of the sliding table saw according to the sixth representative embodiment, and shows the saw parts at the uppermost position;

Figure 26 is a perspective view of the sliding table saw shown in Figure 25, and showing the saw components in the uppermost position;

Figure 27 is a side view similar to Figure 25, but showing the saw components in the lowermost position;

Figure 28 is a perspective view similar to Figure 26, but showing the saw components in the lowermost position;

29 is an exploded perspective view of a dust collection device of a sliding table saw according to a sixth representative embodiment;

Figure 30 is a cross-sectional view extracted along the XXX-XXX line in Figure 29, and shows the connection structure between the inlet part of the dust collection device and the discharge pipe of the saw part cover;

Figure 31 is a schematic cross-sectional view of a part of the dust collection device seen along the XXXI arrow direction in Figure 29;

32 is a perspective view of an inlet piece of a dust collection device for a sliding table saw according to a seventh representative embodiment;

FIG. 33 is a side view of a sliding table saw according to a seventh representative embodiment, and showing the saw components at the lowermost position;

Fig. 34 is the right side view of the sliding table saw according to the eighth representative embodiment;

Figure 35 is a perspective view of the sliding table saw seen from the left rear side in Figure 34;

Figure 36 is a view similar to Figure 34, but showing the saw components in the lowermost position;

Figure 37 is a perspective view similar to Figure 35, but showing the saw components in the lowermost position;

38 is an exploded perspective view of a dust collection device of a sliding table saw according to an eighth representative embodiment;

Figure 39 is a schematic plan view of the dust collection device;

Figure 40 is a schematic cross-sectional view of a part of the dust collection device;

Figure 41 is a schematic front view of the dust collection device; and

Figure 42 is a schematic front view similar to Figure 41 but showing the position of the dust collection device when the saw unit is rotated laterally. the

Detailed ways

Each of the additional features and teachings disclosed above and below can be utilized alone or in combination with other features and teachings to achieve an improved dust collector and table saw having such a dust collector. Representative examples of the present invention utilize many of these additional features and teachings, alone or in combination with other features and teachings, which are described in detail below with reference to the accompanying drawings. This detailed description is only for teaching those skilled in the art to realize the preferred solution of the present invention in more detail, and is not intended to limit the scope of the present invention. Only the claims define the protection scope of the present invention. Therefore, combinations of features and steps disclosed in the following detailed description may not be necessary to practice the invention in the broadest sense, but are instead taught only specific representative examples of the invention. Furthermore, the various features of the representative examples and of the dependent claims may be combined in ways not specifically listed in order to provide other useful embodiments of the invention. the

(first embodiment)

A first representative embodiment of the present invention will be described below with reference to FIGS. 1 to 3 . Referring to FIG. 1, a representative sliding table saw 1 is shown comprising a base 10 suitably positioned on the worksite floor, a turntable 11 rotatable relative to the base 10 in a generally horizontal The first sliding plate 12 that slides relative to the turntable 11 in the direction, and the second sliding plate 13 that can slide relative to the first sliding plate 12 in the left and right directions. Furthermore, the sliding table saw 1 also includes a saw part 2 with a circular saw blade 14 . The sliding table saw 1 also includes a dust collection device for collecting cutting debris generated during the cutting operation, which will be described below. the

As shown in FIG. 2, the turntable 11 has a disk-shaped portion 11a and is integrally formed with the disk-shaped portion 11a and is radially outward from a part of the outer circumference of the disk-shaped portion 11a (the rightmost part shown in FIG. 2). An extension 11b extending to. A fixing member 11c is operable to fix the turntable 11 at a desired rotational position relative to the base 10 . the

As shown in FIG. 1 , a fence 10 a is fixedly mounted on the base 10 and extends across the turntable 11 . Therefore, in order to cut the workpiece, the workpiece can be placed on the turntable 11 such that one side of the workpiece is in contact with the fence 10a. The workpiece may be pressed against the upper surface of the turntable 11 by a jig (not shown). the

The first sliding plate 12 has a sliding member 12a and a rotating member 12b. As shown in FIG. 1 , the slider 12 a is provided at a position close to the left portion of the turntable 11 . The rotary piece 12b is provided adjacent to the left side of the slider 12a. The turntable 11 supports the slider 12a through a pair of parallel horizontal arms 12c so that the slider 12a can slide in the left and right directions shown in FIG. 1 . The rotating member 12b is laterally rotatably mounted on the sliding member 12a via a shaft 12d so that the rotating member 12b can rotate in the thickness direction of the plate in FIG. 1 . A handle 12e is mounted on the slider 12a to fix the rotating member 12b at a desired rotation angle relative to the slider 12a, so that the cutting operation can be performed with the saw blade 14 and the saw unit 2 inclined laterally with respect to the turntable 11. the

As shown in FIG. 2, the second sliding plate 13 has a pair of parallel horizontal arms 13a and 13b and a pair of clamping arms 13c and 13d. As shown in FIG. 1, the arms 13a and 13b extend horizontally through the upper portion of the rotating member 12b so that the arms 13a and 13b can slide in left and right directions relative to the rotating member 12b. A clip arm 13c is mounted on the left ends of the arms 13a and 13b so as to be connected therebetween. A clip arm 13d is mounted on the right ends of the arms 13a and 13b so as to be connected therebetween. The saw unit 2 is mounted on the right side of the clamp arm 13d. the

As shown in FIG. 2, the saw unit 2 has a motor housing 21, a main housing 24, and a cover 20 integrally formed with each other. The motor housing 21 is disposed on the right side of the main housing 24 as viewed from the operator's direction (upper right in FIG. 2 ). A motor 22 and a cooling fan 23 are provided inside the motor housing 21 . The cooling fan 23 generates air flow from the outside to the inside of the motor housing 21 to cool the motor 22 . A handle 24a is mounted on the main housing 24 for an operator to hold during cutting operations. the

The cover 20 is engaged on the left side of the main housing 24 as viewed from the operator's direction (see FIG. 2 ). As shown in FIG. 1, the cover 20 has a mounting portion 20a vertically rotatably mounted to the clamp arm 13d, so that the saw unit 2 is vertically rotatably coupled to the clamp arm 13d via the mounting portion 20a. The cover 20 has a hollow portion 20b substantially covering the upper half of the saw blade 14 . The saw blade 14 can be driven by the motor 22 so that the saw blade 14 rotates clockwise as shown by arrow A in FIG. 1 to cut the workpiece. Cut chips of the workpiece can be blown into the hollow portion 20 b by the air flow generated by the rotating saw blade 14 . the

As shown in FIG. 1, an upper portion of a splash guard 27 is fixed in the hollow portion 20b so that the splash guard 27 is positioned at the peripheral portion of the lower opening of the cover 20 against the flow of blown cutting chips. This prevents the cutting chips from splashing to the surrounding area and is effectively guided into the hollow portion 20b. the

Together with the cover 20, a discharge pipe 20c is formed to discharge cut chips blown into the hollow portion 20b. In this way, the inside of the discharge pipe 20c communicates with the inside of the hollow portion 20b. In addition, the discharge pipe 20c extends in a direction substantially corresponding to the direction in which the cut chips are blown. A conduit 3 is connected to the upper end of the discharge pipe 20c. the

The dust collection device includes a cover 20 and a conduit 3 , and also includes a separator 4 and a dust container 5 . The conduit 3 includes a hose 3c and joint portions 3a and 3b installed at opposite ends of the hose 3c. The joint parts 3 a and 3 b are connected to the discharge pipe 20 c of the cap 20 and the inlet pipe 41 of the separator 4 , respectively, so that the cap 20 and the separator 4 are connected to each other through the conduit 3 . the

Referring to FIG. 1 , the separator 4 has a tubular separator body 40 preferably made of resin. The tubular separator body 40 includes a substantially cylindrical upper tubular portion 40a and a lower tubular portion 40b, the diameter of which is gradually reduced in a downward direction away from the upper tubular portion 40a. Together with the lower end of the lower tubular portion 40b, a cutting chip discharge pipe 42 is formed to discharge the cutting chips. As shown in FIG. 3, an annular plate 40c is mounted on the upper end of the upper tubular portion 40a. A tubular exhaust duct 43 is mounted in the central opening of the annular plate 40c such that the exhaust duct 43 extends vertically into the upper tubular portion 40a and is coaxial with the central axis of the separator body 40 . the

As shown in FIG. 3, the exhaust pipe 43 has an outlet opening 43a at its upper end and an inlet opening 43b communicating with the inner space of the upper tubular portion 40a at its lower end. In this way, the exhaust pipe 43 is configured to allow air to enter the inlet opening 43 b from the center axis position of the separator body 40 and to discharge the air to the outside of the separator body 40 . The diameters of the outlet opening 43 a and the inlet opening 43 b are preferably the same as each other and larger than the inner diameter of the cut chip discharge pipe 42 . According to this arrangement, the air inside the separator main body 40 tends to flow through the exhaust pipe 43 instead of the cut chip discharge pipe 42 . the

As shown in FIG. 1 , the inlet pipe 41 is mounted on the upper tubular portion 40 a and connected to the joint portion 3 b of the conduit 3 . As shown in FIG. 2 , the inlet pipe 41 is positioned at a position offset from the central axis of the separator body 40 . The inlet pipe 41 extends substantially tangentially along the outer circumference of the upper tubular portion 40a in a horizontal plane. In this way, the cutting chips entering the upper tubular portion 40a through the inlet pipe 41 will rotate along the inner peripheral wall of the separator main body 40 and gradually move downward toward the cutting chip discharge pipe 42 through which the cutting chips are discharged from the separator main body 40 . In this way, the separator 4 is configured as a cyclone separator. the

The dust container 5 has an inlet pipe 5 a joined to a cut chip discharge pipe 42 . As shown in FIG. 1 , the dust container 5 is roughly in the shape of a cuboid, and an inlet pipe 5 a is arranged at its upper end, so that cutting debris can be collected in the dust container 5 . The dust container 5 is preferably made of resin. In particular, the dust container 5 does not have any fabric-like holes or perforations. the

A detachable mounting device 15 is fixedly mounted on the clamp arm 13c, so that the dust container 5 is detachably mounted on the clamp arm 13c, and then mounted to the second slide plate 13 by the mounting device 15. This allows the separator 4 to be detachably mounted on the second sliding plate 13 together with the dust container 5 . the

Although not shown in the drawings, the dust container 5 may be divided into upper and lower parts pivotally connected by a hinge means. In order to dispose of the cutting chips collected in the dust container 5 , the dust container 5 can be removed from the detachable mounting device 15 . The upper and lower parts of the dust container 5 can then be rotated relative to each other by hinge means so that an opening is formed between the upper and lower parts. The cutting chips can then be removed from the dust container 5 through the opening thus formed. the

The operation of the representative embodiment will be described below in conjunction with the cutting operation and the operation of the dust collecting device to collect the cut debris. the

First, in order to cut a workpiece, the saw unit 2 can be turned upward from the lowermost position shown in FIG. 1 to an appropriate turned upward position through the mounting portion 20a. The workpiece is then placed on the turntable 11 . Then start the motor 22 to rotate the saw blade 14 in the direction indicated by the arrow A. The operator can turn the saw unit 2 downwards in the direction of arrow B in FIG. 1 , thereby cutting the workpiece with the rotating saw blade 14 . The cutting chips produced in the cutting operation can be blown by the rotating saw blade 14 and then sent into the conduit 3 and through the hollow portion 20b of the cover 20 and the discharge pipe 20c to the separator 4 . the

If a wide workpiece is to be cut, the saw unit 2 can be slid in the direction indicated by the arrow C by means of the first sliding plate 12 and/or the second sliding plate 13 . This makes it possible to efficiently cut wide workpieces with the saw blade 14 . In this case, the cutting chips are also fed into the conduit 3 and on to the separator 4 . the

The separator 4 is capable of separating the cutting chips fed into the separator 4 from the air carrying the cutting chips. The cutting chips are then collected in the dust container 5 . the

More specifically, a separator 4 is provided between the conduit 3 and the dust container 5 . The separator main body 40 has a cut debris discharge pipe 42 that discharges downward the cutting debris that falls into the separator main body 40 under the force of gravity. The dust container 5 is provided on the downstream side of the cut chip discharge pipe 42 . In addition, the separator main body 40 has an exhaust duct 43 through which the carrier air after being separated from the cutting chips can be discharged upward. the

In this way, the cutting chips and the carrying air in the separator main body 40 can be separated and discharged in opposite directions (ie, upward and downward directions), respectively. This prevents the dust collection efficiency from being lowered due to the clogging of the mesh of the fabric dust collection bag for separating the cutting chips in the prior art. In addition, cutting chips can be disposed of cleanly, as there is no need to tap the dust collection bag to remove clogged cutting chips. the

More specifically, the position of the inlet pipe 41 of the separator body 40 for connecting the conduit 3 deviates from the central axis of the separator body 40 as shown in FIG. 2 . Therefore, while the cutting chips rotate along the circumferential direction of the inner wall of the separator main body 40, the cutting chips entering the separator main body 40 through the inlet pipe 41 fall into the separator main body 40 toward the cutting chip discharge pipe 42 (see FIG. 3 ). The cutting chips rotating in the circumferential direction will be biased towards the peripheral wall of the separator body 40 due to the centrifugal force, so that the cutting chips can be effectively separated from the carrying air. In this way, the cutting fragments can be separated from the carrier air by gravity plus centrifugal force. the

Furthermore, as shown in FIG. 1 , the saw blade 14 and the cover 20 are mounted on a second slide plate 13 slidable relative to the base 10 . Furthermore, the separator 4 is mounted on the second slide 13 via the dust container 5 and the detachable mounting device 15 . Thus, when the cover 20 or the saw unit 2 is moved relative to the base 10, the separator 4 will move with the cover 20. Therefore, even if the second sliding plate 13 is slid relative to the base 10, the positional relationship between the cover 20 and the separator 4 does not change. This prevents excessive bending of the conduit 3 connected between the cover 20 and the separator 4 . Furthermore, this positional relationship ultimately prevents the occurrence of situations where the cutting chips cannot be efficiently fed from the cover 20 into the separator 4 due to excessive bending of the conduit 3 . As a result, the cut chips can be fed into the separator 4 smoothly and efficiently. the

In addition, since the dust container 5 is detachably mounted on the second slide plate 13 through the detachable mounting device 15 , the dust container 5 can be detached from the second slide plate 13 in order to dispose of the cut debris collected in the dust container 5 . This facilitates disposal of cut debris. In addition, since the separator 4 and the dust container 5 are installed together on the second slide plate 13, even if the second slide plate 13 is slid, the positional relationship between the dust container 5 and the separator 4 will not change. As a result, the cut chips can be fed from the separator 4 into the dust container 5 by a simple mechanism constituted by the cut chip discharge pipe 42 and the inlet pipe 5a. the

(Second representative embodiment)

The second representative embodiment is a modification of the first representative embodiment, and its only difference from the first representative embodiment is the addition of a straw 7 indicated by a dotted line in FIG. 1 . Suction tube 7 is made of a flexible pipe. Further, the suction pipe 7 has joint portions at opposite ends of the exhaust pipe 43 respectively connected to the outlet opening 43 a and the inlet opening formed in the motor case 21 on the upstream side of the cooling fan 23 . According to this arrangement, the suction force generated by the fan 23 will draw air into the separator body 40 through the suction pipe 7 . In this way, the blowing force of the rotary saw blade 14 and the suction force generated by the fan 23 can be used to convey the cutting chips from the side of the saw blade 14 to the separator 4 . the

As described above, the separator 4 and the motor housing 21 are mounted on the second slide plate 13 as shown in FIG. 2 . Therefore, the suction pipe 7 connected between the separator 4 and the motor housing 21 will not bend excessively, because the suction pipe 7 can move relative to the base 10 along with the second sliding plate 13. As a result, the suction tube 7 does not interfere with the sliding of the second sliding plate 13 . Furthermore, the suction tube 7 can have a length that just corresponds to the distance between the separator 4 and the motor housing 21 because the suction tube 7 is not affected by the sliding of the second slide 13 . the

As described above, according to this modification, the air in the separator main body 40 can be sucked by the suction force generated by the fan 23 because the upstream side of the fan 23 and the exhaust pipe 43a of the separator main body 40 are connected to each other through the suction pipe 7. This reduces the air pressure inside the separator main body 40 , thereby effectively sucking cutting chips from the saw blade 14 side through the cover 20 and the duct 3 . As a result, the dust collection efficiency can be improved. the

(Third representative embodiment)

A third representative embodiment will be described below with reference to FIG. 4 . The third representative embodiment differs from the first representative embodiment only in that the dust collection container 5 and the detachable mounting device 15 are respectively replaced by the dust container 6 and the detachable mounting device 16 shown in FIG. 4 . The third representative embodiment is otherwise the same as in the first representative embodiment. the

As shown in FIG. 4, the dust container 6 includes a non-porous bag 6b made of plastic or the like and a frame member 6a defining an upper opening of the bag 6b so that the upper opening of the bag 6b remains open. The handle 6c and the engaging member 6d are formed or mounted on the frame member 6a. the

The removable mounting device 16 is mounted on the clip arm 13c and includes a mounting portion 16a and an arm 16b. The mounting portion 16 a is detachably engaged with the engaging piece 6 d of the dust container 6 . The arm 16b is used to fix and support the separator main body 40 of the separator 4 so that the dust container 6 is located below the cutting debris discharge pipe 42 of the separator 4 while the upper opening of the bag 6b is opposite to the cutting debris discharge pipe 42 . Also according to this arrangement, substantially the same functions and effects as those of the first representative embodiment can be obtained. the

(the first to the third represent possible modifications of the embodiment)

The first to third representative embodiments described above can be modified in various ways. the

For example, in the representative embodiments described above, the separator 4 separates cut debris from the carrier air using gravity and centrifugal force. However, it is also possible to separate the cut pieces solely by gravity. For example, the separator body may have walls or plates defining a vertical plane against which cut debris in the carrier air strikes. Optionally, a labyrinth-shaped flow channel is formed in the main body of the separator, so that cutting debris in the carrying air hits the wall of the flow channel. In this way, when the cutting debris hits a vertical wall or walls in the flow path, the flow velocity of the cutting debris is reduced, causing the cutting debris to fall under the force of gravity. In the same manner as in these embodiments, the cut chips can be discharged from the cut chip discharge pipe. Carrier air can be vented upwards from the exhaust pipe. the

In addition, although the above representative embodiments are described in conjunction with a sliding table saw, the structure of the dust collection device described above is equally applicable to a table saw in which the saw part cannot slide relative to the base, and to a table saw without a base. A portable circular saw without a sliding mechanism. the

Additionally, in order to create a circulating flow of cut debris within the separator body, the inlet pipe is positioned off the center axis of the separator body. Optionally, in order to form a circulating flow, a deflector such as a vane can also be provided in the separator body. the

In a second representative embodiment, the suction pipe is connected to the upstream side of the fan. However, the suction tube can also be connected to a separate reduced pressure generating device such as a vacuum pump. the

(Fourth representative embodiment)

A fourth representative embodiment will be described below with reference to FIGS. 5 to 19 . The fourth representative embodiment is a modification of the first representative embodiment. Therefore, in Figs. 5 to 19, the same elements as those in the first representative embodiment are given the same reference numerals as in Figs. 1 to 3, and descriptions of these elements will not be repeated. the

Referring to Figures 5 and 6, a representative sliding table saw 101 is shown. Similar to the sliding table saw 1 of the first representative embodiment, the sliding table saw 101 includes a base 10 , a turntable 11 , a first slide 12 , and a second slide 13 . The saw unit 102 is installed on the second slide plate 13, and its main difference from the saw unit 2 of the first representative embodiment is that the main body housing 24 of the saw unit 102 has an auxiliary handle 24b in addition to the handle 24a, and the motor housing 21 Instead of extending horizontally, it extends obliquely upwards. In addition, the cover 20 of the saw unit 102 is vertically rotatably supported on the clamp arm 13d through the pivot 26, similar to the role of the mounting portion 20a in the first embodiment. Furthermore, a dust collection device 103 is mounted on the saw unit 2 . the

As shown in FIG. 6 , a fixing bolt 109 is mounted on the turntable 11 for fixing the position of the arm 12 c of the first slider 12 relative to the turntable 11 . In addition, a fixing bolt 110 is mounted on the clamp arm 13c for securing the arms 13a and 13b in position relative to the clamp arm 13c and thereby relative to the pivot member 12b. In this way, when the fixing bolts 109 and 110 are tightened, the saw unit 2 will not slide horizontally, but can only rotate vertically. the

Furthermore, as shown in FIG. 5 , the lower half of the saw blade 14 is covered by a rotatable safety cover 25 so as to expose the lower half of the saw blade 14 when the saw unit 2 moves downward. In addition, a trigger 24a1 (see FIG. 6 ) is installed on the handle 24a. When the operator pulls the trigger 24a1, the motor 22 starts to rotate the saw blade 14 . the

The dust collecting device 103 will now be explained. The dust collection device 103 is connected to the discharge pipe 20b of the cover 20, and includes a first collection chamber 3a, a cyclone unit 3c, and a second dust collection chamber 3b as shown in FIG. 13 . As shown in FIG. 11 , the first dust collection chamber 3 a is defined between the first outer wall 30 and the intermediate partition wall 31 . The second dust collection chamber 3 b is defined between the intermediate partition wall 31 and the second outer wall 32 . the

As shown in FIG. 13 , the inlet piece 33 is installed and supported between the first outer wall 30 and the intermediate partition wall 31 . One end of the inlet piece 33 opens into the first dust collection chamber 3a. The other end of the inlet piece 33 is joined to the discharge pipe 20c of the cap 20 (see FIG. 6 ). Therefore, the inner space in the hollow portion 20b of the cover 20 communicates with the first dust collection chamber 3a through the inlet piece 33 . As shown in FIG. 13 , an outlet hole 31 c is formed in the intermediate partition wall 31 . One end of the outlet hole 31c leads to the first dust collection chamber 3a. The other end of the outlet hole 31c is connected to the cyclone unit 3c. Therefore, the first dust collection chamber 3a communicates with the inner space of the cyclone unit 3c through the outlet hole 31c. Preferably, the outlet hole 31c is located at a higher position than the inlet piece 33 . the

As shown in FIG. 9, a cyclone unit 3c is provided between the first dust collection chamber 3a and the second dust collection chamber 3b. The function of the cyclone unit 3 c is similar to that of the separator 4 of the first representative embodiment, and the cyclone unit 3 c includes a cyclone main body 36 and an exhaust member 37 . The cyclone main body 36 includes a substantially cylindrical upper tubular portion 36a and a lower tubular portion 36b integrally formed with the upper tubular portion 36a (see FIG. 10 ). The diameter of the lower tubular portion 36b gradually decreases downward. the

An inlet pipe 36c (see FIG. 13 ) is formed together with the peripheral wall of the upper tubular portion 36a, and is joined to the outlet hole 31c of the intermediate partition wall 31 . the

The first dust collection chamber 3a communicates with the inner space of the upper tubular portion 36a of the cyclone main body 36 through the outlet hole 31c and the inlet pipe 36c. the

The inlet tube 36c is positioned offset from the central axis of the upper tubular portion 36a and extends generally tangentially from the outer circumference of the upper tubular portion 36a. Thus, cutting chips and carrying air entering the inner space of the upper tubular portion 36a through the inlet pipe 36c rotate in the circumferential direction along the inner wall of the upper tubular portion 36a (see FIG. 8 ). The rotating cutting chips gradually fall down and are discharged into the second dust collecting chamber 3b through the cutting chip discharge pipe 36d formed on the lower end of the lower tubular portion 36b (see FIG. 13). the

As shown in FIG. 13, the exhaust member 37 has an annular portion 37a and an exhaust pipe portion 37b extending through the central opening of the annular portion 37a. As shown in FIG. 9 , the annular portion 37 a is installed such that it covers the upper opening of the upper tubular portion 36 a of the cyclone main body 36 . The exhaust pipe portion 37 b extends into the cyclone main body 36 along the central axis of the cyclone main body 36 . The exhaust pipe portion 37b has an exhaust opening 37b1 and an intake opening 37b2 at the upper and lower ends of the exhaust pipe portion 37b, respectively. Accordingly, the carrier air sent into the cyclone main body and separated from the cutting chips can flow into the intake opening 37b2 of the exhaust duct portion 37b, and be discharged from the exhaust opening 37b1. Preferably, a wire mesh 37c extending across the inner space of the exhaust pipe portion 37b is provided near the exhaust opening 37b1 to prevent unauthorized entry into the cyclone main body 36 or to prevent foreign matter from entering the cyclone main body 36. Preferably, the mesh of the wire mesh 37c is designed to be large enough not to block the flow of air. the

As shown in FIG. 13, an inlet hole 32a is formed in the second outer wall 32 together with the intermediate partition wall 31, which defines the second dust collection chamber 3b. One end of the inlet hole 32a leads to the second dust collection chamber 3b. The other end of the inlet hole 32 a is connected to a cut debris discharge pipe 36 d of the cyclone main body 36 . This enables the cut chips that have been separated from the carrier air in the cyclone unit 3c to be discharged into the second dust collection chamber 3b through the inlet hole 32a. the

As shown in FIG. 7, the cyclone unit 3c is connected to the inlet hole 32a, while the cyclone unit 3c is positioned relative to the second outer wall 32 such that the cyclone unit 3c is inclined at about 25° (for example, 25°±10°) relative to the vertical direction. angle. This ensures a large space portion in the second dust collecting chamber 3b below the inlet hole 32a. the

As shown in FIGS. 10 and 16 , the dust container 3 includes: a cover 34 configured as a tray for disposing of collected cutting chips; and an engaging member 35 for engaging the cover 34 . As shown in FIG. 11, the position of the cover 34 extends below between the first and second dust collection chambers 3a and 3b to define the bottoms of these chambers. As shown in FIG. 13, attached to one end (the left end in FIG. 13) of the cover 34 is a rod 34 having opposite ends rotatably connected to the first and second outer walls 30 and 32, respectively. the

As shown in FIG. 13, the engaging member 35 has a pair of rods 35b which are disposed at an intermediate position with respect to the vertical direction and which extend from both sides of the engaging member 35. As shown in FIG. The rod 35b is rotatably connected to the first and second outer walls 30 and 32, respectively, such that the engaging member 35 can rotate about a substantially horizontal axis defined by the rod 35b. the

At the lower end of the engaging piece 35 is formed a pawl 35a capable of engaging with the lower surface of one end of the cover 34 opposite to the joint portion of the rod 34a. An elastic member 38 (coil spring in this representative embodiment) is provided between the upper end of the engaging member 35 and the first outer wall 30 so that the engaging member 35 is biased in the direction in which the pawl 35a engages with the cover 34 . the

Referring to FIGS. 14 and 15 , the dust container 103 further includes a rotation angle adjusting device for adjusting a rotation angle relative to the cover 20 . As shown in Figure 13, the rotation angle adjusting device includes a rotating shaft portion 33a formed on the inlet piece 33. The shaft portion 33 a has a substantially cylindrical configuration and has an axis substantially perpendicular to the longitudinal axis of the inlet piece 33 . The rotating shaft portion 33 a has opposite end portions which are interposed between the inlet piece 33 and the first outer wall 30 and between the inlet piece 33 and the intermediate partition wall 31 , respectively. The rotation restricting portion 33b is formed on the shaft portion 33a, and protrudes radially from the peripheral wall of the shaft portion 33a. the

The first outer wall 30 and the middle partition wall 31 respectively have rotation supporting grooves 30b and 31b for rotatably supporting opposite ends of the shaft portion 33a so that the dust container 103 can rotate vertically relative to the cover 20 around the axis of the shaft portion 33a. In addition, the first outer wall 30 and the intermediate partition wall 31 have wall portions 30a and 31a extending from the circumference of the support grooves 30b and 31b, respectively, for engaging with the rotation restricting portion 33b to restrict the rotation angle of the shaft portion 33a. the

The operation of the above-mentioned fourth representative embodiment will be described below in connection with the cutting operation of the workpiece. First, as shown in FIG. 17, the saw unit 2 is rotated vertically upward to a proper rotational position (in this representative embodiment, a position at an angle of approximately 40° from the horizontal position). Here, the horizontal position of the saw unit 2 refers to the lowermost position of the saw unit 2 in which the discharge pipe 22c of the cover 20 extends substantially in the horizontal direction. The workpiece W is then placed on the turntable 11 and fixed from the top with a holding device (not shown). In this step, the right end of the dust container 103 (viewed from FIG. 17 ) is in contact with the second slide plate 13 under the force of gravity, so that the dust container 103 is in the substantially horizontal position shown in FIG. 15 with the cover 34 and the discharge pipe 22c. Extends approximately horizontally. the

The operator then starts the motor 22 to make the saw blade 14 rotate in the direction indicated by the arrow R in FIG. 17 . Then, the operator rotates the saw part 2 downward about 15° (for example, 15°±5°) from the position shown in FIG. The horizontal position is rotated by an angle of approximately 25°. As the saw unit 2 is turned, the inlet piece 33 is turned counterclockwise by the same 15° angle from the position shown in FIG. 17 . In the rotated position, the rotation restricting portion 33b of the shaft portion 33a is engaged with the peripheral ends of the wall portions 30a and 31a. the

When the saw unit 2 is further rotated downward by an angle of about 25° (for example, 25°±5°) from the position shown in FIG. 18 , the saw unit 2 is in the substantially horizontal position shown in FIG. 19 . As the saw part 2 turns, the inlet piece 33 turns further in the counterclockwise direction together with the saw part 2 . In addition, the dust collecting device 103 also rotates together with the inlet piece 33 by the same angle of 25° through the engagement between the rotation restricting portion 33b and the peripheral ends of the wall portions 30a and 31a. As a result, as shown in FIG. 19, the cyclone unit 3c will be in a substantially vertical position, wherein the central axis of the cyclone unit 3c extends at an angle of approximately 90° (eg, 90°±5°) relative to the horizontal direction. In the state shown in FIG. 19, the inlet piece 33 is inclined at an angle of about 40° relative to the horizontal (see FIG. 14). the

The saw blade 14 cuts the workpiece W when the saw unit 2 is rotated from the state shown in FIG. 18 to the state shown in FIG. 19 . Cut chips generated during the cutting operation are blown upward by the rotating saw blade 14 from the right side of the saw blade 14 as shown in FIG. 6 together with air. The cutting chips are sent into the dust container 103 through the hollow portion 20b of the cover 20 and the discharge pipe 20c. the

More specifically, the cutting chips are sent into the first dust collection chamber 3a through the inlet piece 33 (see FIGS. 5 and 11). Those cutting fragments with a relatively large mass will fall into the first collection chamber 3a under the action of gravity and be collected therein. Other small and light cut pieces that do not fall into the first collection chamber 3a under the action of gravity will move along with the carrying air to the inlet pipe 36c of the cyclone main body 36 . the

As shown in FIG. 12 , a baffle plate 31 d is installed in the first dust collection chamber 3 a to prevent large-mass cutting debris from entering the cyclone main body 36 . More specifically, a baffle 31d is formed on the intermediate partition wall 31 and extends below the inlet pipe 36c. the

As shown in FIG. 8, the cutting debris entering the cyclone main body 36 through the inlet pipe 36c rotates along the inner wall of the cyclone main body 36 in the circumferential direction indicated by the arrow T, and meanwhile, the cutting debris gradually falls under the action of gravity. In this way, the cutting fragments that do not fall into the first dust collection chamber 3a can be separated by centrifugal force and gravity, and then sent into the second dust collection chamber 3b. As noted above, during a cutting operation, the cyclone body 36 may be in a generally vertical position. This makes it possible to effectively separate the cut chips by the cyclone unit 3c. the

When the saw unit 2 is in the lowermost position shown in FIG. 5, the dust container 103 can be positioned such that it extends toward the upper right as shown in FIG. This facilitates collecting the cut debris in the lower left part of the first dust collection chamber 3a, away from the outlet hole 31c, and in the lower left part of the second dust collection chamber 3b, away from the inlet hole 32a. It is therefore possible to increase the amount of cutting chips collectable in the first dust collection chamber 3a and the second dust collection chamber 3b. the

As described above, it is possible to collect large and heavy cutting chips in the first dust collection chamber 3a, and collect small and light cutting chips in the second dust collection chamber 3b. When the first dust collection chamber 3a is filled with cutting chips, the second dust collection chamber 3b can be used as an auxiliary chamber. the

In order to cut a large-sized workpiece W, as shown in FIG. 5 , the operator may push the saw unit 2 to the right as shown in FIG. 5 . The saw element can thus be slid to the right by means of the first slide 12 and the second slide 13 . the

After the cutting operation, the operator can turn the saw unit 2 upwards (see FIG. 18 ), so that the dust collecting device 3 rotates with the saw unit 2 while the right side part of the saw unit 2 gradually moves down. The dust collecting device 103 will contact with the second slide plate 13 then. When the saw part 2 continued to rotate upwards (see FIG. 17 ), the inlet piece 33 rotated relative to the dust collecting device 103, such as at an angle of about 15°±5°, so that the rotation limiting portion 33b was away from the circumferential ends of the wall portions 30a and 31a, and at the same time The dust collecting device 103 maintains a substantially horizontal position. This makes it possible to continue to rotate the saw part 22 upwards from the horizontal position by large angles, for example a maximum rotation angle of 40°±5°. the

In order to dispose of the cutting chips collected in the first dust collection chamber 3a and the second dust collection chamber 3b as shown in FIGS. The operator can push the upper part of the engaging part 35 to rotate the engaging part 35 against the biasing force of the elastic part 38 , so that the claw part 35 a of the engaging part 35 is detached from the cover 34 . Then, the operator can rotate the cover 34 around the rod 34a, so that the bottoms of the first and second dust collection chambers 3a and 3b are simultaneously opened, and the collected cutting chips are processed at the same time. the

As described above, according to the fourth representative embodiment, as shown in FIG. 5, the dust collecting device 103 has the first dust collecting chamber 3a, the cyclone unit 3c and the second dust collecting chamber 3b. Cutting chips carried by the air and blown out from the side of the saw blade 14 fall into the first dust collection chamber 3a under the force of gravity and are collected therein. Cutting chips that do not fall into the first dust collection chamber 3a enter the cyclone unit 3c, wherein the cutting chips rotate along the inner peripheral wall of the cyclone unit 3c together with the carrying air, and fall therein. This separates the cutting debris from the carrier air by centrifugal force and gravity. The cutting chips are then discharged from the bottom of the cyclone unit 3c into the second dust collection chamber 3b through the cutting chip discharge pipe 36d, while the carrying air is discharged from the cyclone main body 36 from the top of the cyclone unit 3c through the exhaust pipe 37b1. In this way, the first dust collection chamber 3a separates relatively heavy and large cutting chips from the carrying air, while relatively small and light cutting chips are separated from the carrying air through the cyclone unit 3c. the

A non-woven filter is provided in the dust collection device 103 for separating cutting debris from the carrier air. Thus, the flow of carrying air generated by the rotating saw blade 14 is not blocked by the fabric filter. In addition, there is no gradual reduction in dust collection performance due to cut debris clogging the mesh of the fabric filter. In this way, the cut debris can be effectively collected in the dust collecting device 103 . the

In addition, according to this representative embodiment, angle adjusting means (30a, 31a, 33b) are provided between the cover 20 and the dust collecting means 103 as shown in FIGS. This makes it possible to adjust the angular position of the dust collection device 103 to a suitable position, for example, for efficient collection of cutting chips by the cyclone unit 3c. the

Particularly, according to this representative embodiment, the angle adjusting device adjusts the relative angle between the cover 20 and the dust container 103 in such a way that the relative angle generated when the cover 20, i.e., the saw unit 2 is in the uppermost position, is smaller than that of the cover 20, i.e., the saw unit 2. The relative angle created when in the bottommost position. Thus, when the cover 20 or the saw unit 2 is in the uppermost position shown in FIG. 17, the relative angle between the cover 20 and the dust collecting device 103 is 140°±5°. And when the cover 20 or the saw part 2 is in the lowermost position shown in FIG. 19, the relative angle can be 155°±5°, so that the cyclone unit 3c can extend substantially vertically. the

With this adjustment, the cover 20 approaches the dust collecting device 103 during the movement of the cover 20 or the saw unit 2 from a predetermined position below the uppermost position to the uppermost position. However, the dust collection device 103 does not interfere with the movement of the cover 20 . the

During the movement of the cover 20 or the saw unit 2 from a predetermined position above the lowermost position to the lowermost position, the relative angle between the dust collecting device 103 and the cover 20 is relatively large. Therefore, when the cover 20 or the saw part 2 is in the lowermost position, the angle of the dust collecting device 103 relative to the horizontal direction (i.e. 25°±5°) is smaller than the angle of the cover 20 relative to the horizontal direction (i.e. 40°±5°). °). This minimizes the inclination of the cyclone unit 3c relative to the vertical. As a result, it is possible to prevent the separation efficiency of the cyclone unit 3c from being lowered due to inclination. the

Furthermore, according to the present representative embodiment, the cover 34 extends between and below the first and second dust collection chambers 3a and 3b as shown in FIGS. 13 and 16 . This makes it possible to dispose of the cutting chips collected in the first and second dust collection chambers 3a and 3b simultaneously by opening the cover 20. the

Furthermore, the dust collection device 103 can be readily used with existing table saws having a dust collection device by simply removing the dust collection device from the discharge pipe and connecting the inlet piece 33 of the dust collection device 103 to the discharge pipe. This can expand the scope of use of the present invention. the

(fifth representative embodiment)

A fifth representative embodiment will be described below with reference to FIGS. 20 to 24 . The fifth representative embodiment is a modification of the fourth representative embodiment, and differs from the fourth representative embodiment only in that dust collecting device 103 is replaced by dust collecting device 104 . In addition, the basic structure of the dust collection device 104 is the same as that of the dust collection device 103, but the difference mainly lies in the arrangement of some elements such as the cover. Therefore, the fifth representative embodiment will be described only in connection with the different arrangements of the dust collecting device 104 and the dust collecting device 103 . the

Referring to Fig. 20, the dust collection device 104 has a first dust collection chamber 104a, a cyclone unit 104c and a second dust collection chamber 104b, respectively corresponding to the first dust collection chamber 3a of the fourth representative embodiment, the cyclone unit 3c and the second dust collection chamber. Collection chamber 3b. The first dust collection chamber 104a and the second dust collection chamber 104b are defined by a first tubular member 140 and a second tubular member 142 (as shown in Figures 21 and 24), respectively, molded by, for example, a blow molding process. The first and second tubular members 140 and 142 each have a closed first end and an open second end opposite the first end (left and right ends as viewed in FIGS. 21 and 24 ). The open second ends of the first and second tubular members 140 and 142 are closed by a removable cover 144 formed into a plate-like structure by, for example, an injection molding process. the

As shown in FIG. 20, a pair of arms 144b are formed on lateral sides of the upper end of the cover 144, and are pivotally connected to the first and second tubular members 140 and 142, respectively. As shown in FIG. 23 , at the lower end of the cover 144 is formed an engaging portion 144c capable of engaging with the lower surface of the right end of the second tubular member 142 . In addition, an installation opening 144a is formed on the cover 144, and this opening leads to the first dust collection chamber 104a to be connected with the cover 20 (see FIG. 8). the

As shown in FIG. 20 , the cyclone unit 104 c has a cyclone main body 146 and an exhaust member 147 . The cyclone main body 146 has a substantially cylindrical upper tubular portion 146a and a lower tubular portion 146b. The lower tubular portion 146b is integrally formed with the upper tubular portion 146a and has a diameter that gradually decreases downward. The connecting pipe 141 is connected between the upper tubular part 146 a and the first tubular member 140 . More specifically, one end of the connection pipe 141 is connected to an upper portion of the first tubular member 140 . The other end of the connecting pipe 141 is connected to the upper tubular part 146a at a position deviated from the central axis of the upper tubular part 146a or the cyclone body 146 so that the connecting pipe 141 extends tangentially from the circumference of the upper tubular part 146a. As shown in FIG. 23, a cut chip discharge hole 146d is formed at the lower end of the lower tubular portion 146b, and this opening leads to the second dust collection chamber 104b. the

As shown in Figure 20, the central axis of the cyclone main body 146 of the cyclone unit 104 is inclined relative to the longitudinal axis of the second tubular member 142, so that when the saw part 2 is in the lowermost position (see Figure 6), the cyclone main body 146 The central axis of the axis extends approximately along the vertical direction (for example, at 90°±5° relative to the horizontal direction). the

As shown in FIGS. 20 and 23 , the exhaust member 147 has a ring portion 147 a and an exhaust pipe 147 b inserted into the central opening of the exhaust member 147 . The annular portion 147a is fitted to the upper tubular portion 146a to cover the upper opening of the upper tubular portion 146a. The exhaust duct 147b is positioned such that it extends into the cyclone body 146 along the central axis such that the exhaust duct 147b has an exhaust opening 147b1 at an upper end and an intake opening 147b2 at a lower end. the

Also, the fifth representative embodiment can achieve substantially the same operations and effects as those of the fourth representative embodiment. the

(possible modifications of the fourth and fifth representative embodiments)

The dust collecting device of the fourth and fifth representative embodiments can be used in combination with a non-sliding table saw or a circular saw without a rotary disc. the

The angle adjusting device of the fourth representative embodiment is configured such that the rotation restricting portion and the stopper are separated from each other to allow the dust collecting device to move relative to the cover or when the dust collecting device is in the horizontal position shown in FIGS. The saw part rotates. However, the angle adjustment means may also be arranged such that the dust collecting means rotates positively relative to the cover or saw unit so as to reduce the angle relative to the cover or saw unit as the saw unit moves from a predetermined position below the uppermost position to the uppermost position . the

In addition, although the angle adjusting device is provided between the dust collecting device 103 (104) and the discharge pipe 20c of the cover 20, the angle adjusting device may also be provided between the cover 20 and the discharge pipe 20c or between the dust collecting device and the saw unit 2. any other position in between. the

(sixth representative embodiment)

A sixth representative embodiment will be described below with reference to FIGS. 25 to 31 . The sixth representative embodiment is a modification of the fourth representative embodiment. Therefore, the same components as those of the fourth representative embodiment are assigned the same reference numerals and will not be described in detail again. the

The sliding table saw 201 of the present representative embodiment is basically the same as the sliding table saw 101 of the fourth representative embodiment. Therefore, the configuration of the sliding table saw 201 will be described mainly in connection with the configuration different from the sliding table saw 101 of the fourth representative embodiment. the

As shown in FIG. 25 , a light emitting device 217 such as a fluorescent lamp or an incandescent lamp is mounted on the handle 24 a of a saw unit 210 corresponding to the saw unit 2 . The light emitting device 217 is located on the rear side (the right side in FIG. 25 ) of the handle 24a. the

The dust collecting device 203 corresponding to the dust collecting device 103 has an inlet piece 223 (see FIG. 29 ). The inlet piece 223 corresponds to the inlet piece 33 and has a cylindrical shaft portion 223 a (corresponding to the shaft portion 33 a ) and a connecting pipe portion 223 b for connecting to the discharge pipe 20 c of the cap 20 . The opposite sides of the shaft portion 223a are sealed by a circular cover 223c. The connecting pipe portion 223b extends radially from the circumference of the rotating shaft portion 223a, and has a diameter capable of sealingly connecting to the discharge pipe 20c. On the side opposite to the shaft portion 223a, an opening 223d (see FIG. 30 ) is formed on the circumference of the shaft portion 223, the diameter of which is approximately equal to the inner diameter of the connecting pipe portion 223b, and the opening always leads to the first dust collection chamber 3a. . In this way, the inner space of the casing 20 and the first dust collection chamber 3 a can be always communicated through the inlet piece 223 . the

As shown in FIG. 29 , opposite ends of the shaft portion 223 a are rotatably accommodated in circular support grooves 222 c formed in the inner surfaces of the first outer wall 30 and the intermediate partition wall 31 , respectively. Therefore, at the front position of the first dust collection chamber 3a, the inlet piece 223 can rotate relative to the first outer wall 30 and the intermediate partition wall 31, so that the inlet piece 223a can rotate freely in the vertical direction. As shown in FIG. 30, the connection pipe portion 223b extends outward from the first dust collection chamber 3a through an opening 222d formed at the front end of the first dust collection chamber 3a. The opening 222d is configured to have an elongated opening in the vertical direction so that the inlet piece 223 can be rotated vertically. In the state where the inlet piece 223 is connected to the discharge pipe 20c of the cover 20, the dust collecting device 203 can be turned downwards relative to the longitudinal axis J of the discharge pipe 20c by a maximum angle of 5°. In addition, the dust collecting device 203 can also be rotated upward relative to the longitudinal axis J, with a maximum angle of 40°. The dust collection device 203 can rotate freely within this range, and if no opposite force is applied to the dust collection device 203, it can also move to the lowermost rotation position under the action of gravity. the

The opening 222d at the front of the first dust collection chamber 3a is sealed from the inside of the first dust collection chamber 3a to prevent the cutting chips collected in the first dust collection chamber 3a from splashing to the outside and to prevent the air carrying the cutting chips from leaking to the outside. To this end, a seal 224 made of felt is wound around the shaft portion 223a so as to extend longitudinally continuously along opposite sides of the shaft portion 223a and radially across the cover 223c. According to this connection, a pair of wall portions 222e are formed which are continuous with the inner walls of the respective support grooves 222c of the first outer wall 30 and the intermediate partition wall 31 . Each of the wall portions 222e has a substantially arc-shaped cross section. The pair of wall portions 222e face each other in the radial direction of the corresponding support groove 222c or with respect to the rotation axis of the rotation shaft portion 223a. The pair of wall portions 222e of the first outer wall 30 and the pair of outer walls 222e of the intermediate partition wall 31 extend toward each other in the width direction of the first dust collection chamber 3a, so that the terminal ends of the wall portions 222e of the first outer wall 30 are respectively connected to the intermediate partition wall 31. The corresponding terminals of the wall portion 222e are in close contact without forming any significant gap. The seal member 224 is in sliding contact with the two pairs of wall portions 222e and the bottom of the receiving groove 222c to seal the first dust collection chamber 3a from the outside. the

In addition, the wall portion 222e extends along the circumference of the corresponding supporting groove 222c to such an extent that the wall portion 222e does not interfere with the vertical rotation of the connecting pipe portion 223b and does not block the front of the opening 222d in the flow direction of the cutting chips. However, the wall portion 222e has sufficient circumferential length to ensure that the sealing member 224 can contact the wall portion 222e within the entire vertical rotation range of the inlet piece 223 or the dust collection container 203 . the

A rotation restricting portion 223e corresponding to the rotation restricting portion 33b is formed on the rotating shaft portion 223a and appropriately contacts the peripheral edge of the wall portion 222e so as to restrict the rotational range of the inlet piece 223 . the

As shown in FIG. 29, a coil spring 228 is fixed to the rod 34a of the cover 34 so as to normally bias the cover 34 in the opening direction. the

A limiting member 250 (see FIGS. 25-28 ) for limiting the end point of the downward stroke of the dust collecting device 203 is mounted on the clamp arm 13c and serves to support the dust collecting device 203 from below. Preferably, the restraint 250 is made of steel wire having a suitable diameter. Viewed from above, the steel wire is bent into a substantially inverted U-shaped structure, and viewed from a lateral direction, has a substantially inverted L-shaped structure, so that the upper part of the limiting member 250 crosses the clamp arm 13c and faces forward under the dust collecting device 203 (in the case of the operator side) extending obliquely. The opposite ends of the restricting member 250 are fixed to the clamp arm 13c by bolts 251 and 252 . In this way, the restricting member 250 can be elastically deformed in the vertical direction, so that the upper portion of the restricting member 250 can change its inclination angle relative to the lower portion. the

A rotating member 253 is rotatably fixed on the upper end of the restricting member 250 . The rotating member 253 may be made of a steel wire wound on the upper end of the restricting member 250 . In this way, the dust collecting device 203 can be elastically supported by the restricting member 250 , while the lower surface of the cover 34 of the dust collecting device 203 contacts the upper end of the restricting member 2250 through the rotating member 253 . As a result, the dust collecting device 203 can slide in the front and rear directions in response to the vertical movement of the saw unit 201 . Thus, the saw unit 10 can move smoothly in the vertical direction. the

According to the sixth representative embodiment, the dust collecting device 203 is free to rotate relative to the saw unit 210 within an angular range of a maximum of 45°. More specifically, the dust collecting device 203 is rotatable relative to the longitudinal axis J of the discharge pipe 20c downwardly by an angle of up to 5° and relative to the longitudinal axis J upwardly by an angle of 40°. Thus, when the saw assembly 210 is in the upwardly rotated position shown in Figures 25 and 26, the dust collection device 203 is positioned generally in a horizontal position, where the cover 34 extends generally horizontally and is generally parallel to the arms 13a and 13b. . In this horizontal position, the collecting container 203 is supported by the restricting member 250 while the lower surface of the cover 34 is in contact with the rotating member 253 provided at the upper end of the restricting member 250 . the

The discharge pipe 20c is able to move downward as the saw unit 210 is turned downward. However, since the inlet piece 223 is rotatable relative to the discharge pipe 20c, the dust collection container 203 can be maintained in a horizontal position. the

Also as shown in FIGS. 27 and 28, even if the saw unit 210 has been rotated to the lowermost position, the dust collecting device 203 can remain in the horizontal position. In this way, the sliding table saw 201 can be stored in a storage space, so that the dust collecting device 203 below is in a horizontal direction. Therefore, the sliding table saw 201 can be stored even in a limited storage space having a small height. the

Furthermore, according to the present representative embodiment, the dust collecting device 203 can be maintained in a substantially horizontal position regardless of changes in the vertical position of the saw unit 201 . Therefore, when the dust collecting device 203 is in the horizontal direction, by setting the position of the cyclone unit 3c so that the central axis of the separator body 36 extends in the vertical direction, the cutting chips can always be effectively separated by the cyclone unit 3c. the

Also, since the dust collecting device 203 is supported from below by the restricting member 250, it is possible to reliably prevent the dust collecting device 203 from interacting with the arms 13a and 13b of the second slider 13. This ensures smooth sliding of the saw unit 210 in the horizontal direction. the

Furthermore, in order to fix the limiter 250 to the clamp arm 13c, bolts for fixing the clamp arm 13c in position relative to the arms 13a and 13b may also be used as the bolts 251 and 252. In this way, no additional bolts or additional mechanical operations are required in order to secure the limiter 250 . the

(The sixth represents a possible modification of the embodiment)

The sixth representative embodiment can be modified in various ways. For example, although the restricting member 250 is mounted on the clamp arm 13c in the above representative embodiment, the restricting member 250 may also be mounted on the other clamp arm 13d (which supports the saw member 210), or on the dust collecting device 203. superior. the

According to the representative embodiment described above, the dust collection device 203 is freely rotatable within a range of 45° of angular rotation, and can be rotated to the lowermost rotational position (rotated downward at an angle of about 5° relative to the longitudinal axis J of the discharge pipe 20c) under the force of gravity. s position). However, it may also be designed such that the position of the dust collecting device 203 is maintained at a predetermined position within the rotational range with respect to the discharge pipe 20c or the saw unit 210 . This modified embodiment will be described below using a seventh representative embodiment with reference to FIGS. 32 and 33. FIG. the

(The seventh representative embodiment)

32 and 33, the dust collecting device 255 has an inlet piece 256 having a structure different from the inlet piece 223 of the sixth representative embodiment. Other structures other than the inlet piece 256 are the same as those of the dust collecting device 203 of the sixth representative embodiment, and thus will not be described again. the

The inlet member 256 of the seventh representative embodiment has a stop means called a ball plunger mechanism. The braking means includes a compression coil spring 257, a rigid ball 258 biased in one direction by the coil spring 257, and a fixing plate 259 having a fixing hole 259a engaged with the rigid ball 258. The compression coil spring 257 may be received in one of the receiving holes 256c formed on the cover 256b. The cover 256 closes the open right end of the cylindrical rotating portion 256a. The receiving hole 256c does not extend completely through the thickness of the cover 256b and is closed at the bottom. Thus, the inner space of the connecting pipe portion 256c can be reliably sealed from the outside like the connecting pipe portion 223b of the sixth representative embodiment. A rigid ball 258 is held at one end of the compression coil spring 257 . The fixing plate 259 is accommodated in the supporting groove 222c of the intermediate partition wall 31 such that it is located at the bottom of the supporting groove 222c of the middle partition wall 31 . The fixing hole 259a is configured as a slit formed in the fixing plate 259, and extends for a short distance in the circumferential direction. the

In the fixing plate 259, an engaging groove 259b configured as a cut groove extending radially inward from the peripheral edge of the fixing plate 259 is formed. An engaging protrusion (not shown) is formed on the bottom of the supporting groove 222c, which engages with the engaging groove 259b, thereby preventing the fixing plate 259 from rotating relative to the supporting groove 222c. This allows the right end of the shaft portion 256a to be rotatably accommodated in the support groove 222c, while the fixing plate 259 is interposed between the right end of the shaft portion 256a and the bottom of the support groove 222c. The left end of the shaft portion 256a is rotatably accommodated in a corresponding support groove 222c formed in the first outer wall 30 in the same manner as the sixth representative embodiment. Also, the connecting pipe portion 256c is connected to the discharge pipe 20c of the cover 20 of the saw unit 210 in the same manner as the sixth representative embodiment. the

According to the seventh representative embodiment, the rigid ball 258 is pressed against the fixing plate 259 by the biasing force of the compression coil spring 257 . As long as the rigid ball 258 is not engaged with the fixing plate 259a, when the dust collecting device 255 is vertically rotated relative to the saw unit 210, the fixing plate 259 can rotate with the dust collecting device 255 relative to the cover 256c of the shaft portion 256a. In other words, the dust collecting device 255 can freely rotate vertically under the force of gravity. However, when the rigid ball 258 is brought into opposition to the fixing hole 259a during the rotation of the dust collecting device 255, the rigid ball 258 is engaged with the fixing hole 259a by the biasing force of the compression coil spring 257, which prevents the dust collecting device from 255 continues to rotate. For this reason, the biasing force of the compression coil spring 257 is set to be sufficient to prevent the dust collecting device 255 from rotating against gravity. the

In this representative embodiment, the position of the rigid ball 258 and the position of the fixing hole 259 are determined such that the rotation angle of the dust collecting device 255 is in the entire range of 0° to 45° and at a distance from 0° to 45°. The rigid ball 258 engages the fixing hole 259 within about 15° of the upper limit of the full rotational range. In this way, when the saw member 210 is rotated to the lowermost position or moved up from the lowermost position by a predetermined angle (for example, a position within the rotational range of cutting the workpiece W with the saw blade 14 as shown in FIG. 33 ), the rigid ball 258 can Engage with the fixing hole 259 . Therefore, the dust collecting device 255 may be inclined such that the rear portion (the right portion shown in FIG. 33 ) of the dust collecting device 255 is located upward relative to the front portion. In other words, the dust collecting device 255 is inclined downward toward the front (left direction shown in FIG. 33 ). In contrast, in the case of the sixth representative embodiment, the dust collecting device 203 is positioned in a horizontal position when the saw unit 210 is at the lowermost position, as shown in FIG. 27 . the

With this arrangement, the dust collector 255 is kept tilted downward in the forward direction during the cutting operation. In this way, the second outer wall 32 or the second dust collection chamber 3b is also inclined downward in the forward direction. Since the cyclone unit 3c is located behind the second outer wall 32, the cutting chips discharged by the cyclone unit 3c move toward the front of the second dust collection chamber 3b (the left part shown in FIG. 33) under the force of gravity. In other words, cut debris can be collected at the front inside the second dust collection chamber 3b. In this way, the cut debris can be efficiently collected in the second dust collection chamber 3b without blocking the inlet hole 32a of the second dust collection chamber 3b. As a result, the dust collection efficiency of the dust collection device 255 can be improved. the

To store the sliding table saw 201 in the storage space, the operator can manually press down the rear of the dust collection device 255 from the state shown in FIG. 33 . As a result, the rigid ball 258 can be disengaged from the fixing hole 259a against the biasing force of the compression coil spring 257, thereby moving the dust collecting device 255 to a horizontal position. This enables storage of the sliding table saw 201 by lowering the overall height of the sliding table saw 201 . the

As described above, according to the seventh representative embodiment, when the rotation angle of the dust collecting device 255 is in the range of about 15° from the upper rotation limit of the entire rotation range of 0° to 45°, the dust container 255 is temporarily fixed to the relative to the position of the saw member 210 . In this way, the cutting chips can be stored in the front of the second dust collection chamber 3b during the cutting operation because the second dust collection chamber 3b is kept inclined downward in the forward direction. As a result, the dust collection efficiency of the dust collection device 255 can be improved. the

In addition, it is also possible to move the dust collecting device 255 from the inclined position to the horizontal position when the saw unit 210 is in the lowermost position. Therefore, in the same manner as the sixth representative embodiment, the sliding table saw 201 can be stored in a storage space while making the overall height of the sliding table saw 201 more compact. the

(Other possible modifications of the sixth and seventh representative embodiments)

There are various modifications of the sixth and seventh representative embodiments. For example, the detent employing the spring-biased rigid ball 258 and the fixing hole 259 may be replaced by any other means that temporarily fixes the rotational position of the dust collection device 255 . For example, this detent can be replaced by a fastening screw or a pin which can be releasably inserted into a corresponding pin receiving hole. the

In addition, the structure of the pivotal movement of the dust containers 203 and 255 in the sixth and seventh representative embodiments can be applied to other types of dust collecting devices, such as not having the cyclone unit 3c and the second dust collecting chamber 3b but only the second dust collecting chamber 3b. A dust collecting device of a dust collecting chamber 3a, or such a dust collecting device having a fabric dust collecting bag and a frame for fixing the bag. the

Also, although the dust containers of the sixth and seventh representative embodiments have been described in connection with portable sliding saws, such dust containers can also be used in combination with any other type of cutting device, such as a stationary mounted cutting device. the

(eighth representative embodiment)

An eighth representative embodiment will be described below with reference to FIGS. 34 to 42 . The eighth representative embodiment is basically the same as the sixth representative embodiment. However, the eighth embodiment is added to illustrate specific features not explicitly described in the sixth representative embodiment or other representative embodiments. For this reason, similar components are designated with the same reference numerals in FIGS. 34 to 42 and their description will not be repeated. the

The eighth representative embodiment will be described below with respect to a structure different from that of the sixth representative embodiment, and specific features that substantially exist in some of the preceding representative embodiments but are not specifically described. the

Referring to FIGS. 34 to 37 , a sliding table saw 301 of an eighth representative embodiment includes a saw unit 310 and a dust collecting device 303 . As described in connection with the first representative embodiment (see FIG. 1), the rotary member 12b is laterally rotatably mounted on the slide member 12a via the shaft 12d so that the rotary member 12b can laterally rotate. In addition, a handle 12e is mounted on the slider 12a to fix the rotating member 12b at a desired rotation angle relative to the slider 12a so that the cutting operation can be performed with the saw blade 14 and the saw part 2 inclined laterally with respect to the turntable 11. . These features are also included in the sliding table saw 301 of the eighth representative embodiment and in the table saws disclosed in the second to seventh representative embodiments. the

More specifically, the turning member 12b is capable of turning the saw unit 310 in left and right directions. Typically, however, most operators are right-handed. Therefore, the operator can hold the handle 24 a with the right hand and place the workpiece W naturally on the left side of the turntable 11 . Furthermore, since the motor 12 is located on the right side of the cover 20, it is easier for the operator to see the left side of the saw member 310d rather than the right side. Thus, the operator generally turns the saw unit 310 to the left (relative to the direction of operation) and fixes the saw unit 310 in the desired rotational position by operating the handle 12e. the

34, the first outer wall 30 defining the first dust collection chamber 3a of the dust collection device 303 is extended toward the front and rear (left and right in FIG. 34), and has a substantially triangular structure when viewed laterally. In other words, the first dust collection chamber 3a has a streamlined configuration like the first outer wall 30, and the height gradually increases in the rearward direction. the

As shown in FIGS. 38 and 39, the first outer wall 30 has a lateral extension 30i on the left side shown in FIG. backend. The middle partition wall 31 extends from a position corresponding to a substantially central portion of the first outer wall 30 to a position corresponding to a rear end of the first outer wall 30 . Therefore, the dust collection device 303 has a narrower width of 30 m at the front or side of the inlet piece 223 . Thus, the operator can stably hold the dust collecting device 303 by holding the front portion having a narrower width of 30 m, and easily perform the operation of connecting and disconnecting the dust collecting device 303 to the discharge pipe 20 c of the saw unit 310 . the

Furthermore, as shown in FIG. 40, the first dust collection chamber 3a defines a rear end surface 30g. Cutting chips provided from the front side will hit this rear end surface 30g. The outlet hole 31c is formed in the middle partition wall 31 provided on the right side of the first outer wall 30, and is positioned at a predetermined distance from the rear end surface 30g, so as to avoid or minimize sharply moving cutting chips directly entering after hitting the rear end surface 30g. 31 opportunities for exit hole. That is, a space 3h is ensured between the outlet hole 31c and the rear end surface 30g in order to buffer the flow of the cutting chips hitting and bouncing before the cutting chips reach the outlet hole 31c. This makes it possible to effectively collect the cut debris in the first dust collection chamber 3a. the

As shown in FIGS. 34 and 35 , at the first outer wall 30 defining the left side of the dust collecting device 303 and the portion of the middle partition wall 31 exposed to the outside and defining the right side of the dust collecting device 303 , finger engagement is formed respectively. Slots 3j and 3k. The finger engaging grooves 3j and 3k are located near the upper edges of the first outer wall 30 and the middle partition wall 31 respectively, and extend along the corresponding upper edges. More specifically, the middle positions of the finger engaging grooves 3j and 3k correspond to the positions of the center of gravity of the dust collecting device 303 . Thus, after detaching from the saw unit 310, the operator can hold the dust collecting device 303 with one hand by engaging the fingers with the finger engaging grooves 3j and 3k in a balanced state. the

As shown in FIG. 40, the cyclone main body 36 of the cyclone unit 3c is positioned in such a way that the frontmost and rearmost parts of the cyclone main body 36 are respectively positioned at the front of the substantially aligned outlet hole 31c and the first outer wall 30 and the middle partition wall 31 ( The first outer wall 30 and the intermediate partition wall 31 define the rear end of the rear end surface 3g) of the first dust collection chamber 3a. Since the first outer wall 30 and the middle partition 31 have the greatest height at their rear ends, the cyclone body 36 can be positioned so that it does not extend upwards a greater distance beyond the top of the rear ends of the first outer wall 30 and the middle partition 31 (see FIG. 36 ). In this way, a larger space can be ensured below the cyclone main body 36, so as to increase the cutting debris capacity in the second dust collection chamber 3b. the

The operation of the eighth representative embodiment will be described below with reference to the specific features. First, the cyclone unit 3 c integrally formed with the first outer wall 30 , the middle partition wall 31 and the second outer wall 32 is disposed on the right side of the middle partition wall 31 . Therefore, in order to cut a workpiece with the saw blade 14 inclined relative to the workpiece (oblique cutting operation), when the saw unit 310 is turned leftward with respect to the turntable 11 from the vertical position, the right side of the intermediate partition wall 31 can follow the cyclone unit 3c. Turn up together, as shown in Figures 41 and 42. the

Thus, the cyclone unit 3c will be positioned above the intermediate partition wall 31 or the first dust collection chamber 3a during the oblique cutting operation. This prevents the cutting chips collected in the first dust collecting chamber 3a and/or the cutting chips sent from the housing 20 into the first dust collecting chamber 3a from accidentally flowing into the cyclone unit 3c due to gravity. Therefore, dust collection efficiency can be improved. the

Next, as shown in Figures 36 and 40, the cutting debris entering from the front of the first dust collection chamber 3a will hit the end surface 30g of the first dust collection chamber 3a. Since a space 3h is ensured between the outlet hole 31c and the end surface 30g, the violently flowing flow of cutting chips due to impact does not directly enter the outlet hole 31c. In this way, the cut debris can be efficiently collected in the first dust collection chamber 3a, thereby improving the dust collection efficiency. the

Third, the first dust collection chamber 3a is streamlined and has a gradually increasing vertical height in the rearward direction. In other words, the vertical cross-sectional area of the first dust collection chamber 3a increases toward the rear direction. In this way, the air pressure of the carrying air blown into the first dust collecting chamber 3a will gradually decrease toward the rear without generating turbulent flow, so that the flow velocity of the carrying air will gradually decrease. As a result, the flow velocity of the cutting chips carried by the carrying air is also gradually reduced. In this way, large and heavy cutting chips can be effectively dropped into the first dust collection chamber 3a, thereby improving the dust collection efficiency. the

Although the above features are described in connection with a sliding table saw, these features can also be applied to different types of table saws. For example, although the above features are described in connection with a table saw that can be turned left and right, these features can also be applied to a table saw that can only turn left or only right. If the features described are applied to a table saw that can only be turned to the right, the cyclone unit is preferably located on the left side of the dust collection means so that the cyclone unit is located on the upper side of the first dust collection chamber during oblique cutting operations. Additionally, although the above features have been described in connection with a dust collection device that is rotatable vertically relative to the saw member, these features may also be applied to a dust collection device that is in a fixed position relative to the saw member. the

Claims (4)

1. A saw comprising: rotary circular saw blade (14); and a cover (20) arranged and configured to cover the saw blade (14); A dust collection device (103) connected to the cover (20) such that cutting debris is fed into the dust collection device (103) together with the flow of carrying air generated when the saw blade (14) rotates within the cover (20) );and adjustment means arranged and configured for adjusting the position of the dust collection means relative to the cover; It is characterized by: The dust collection device consists of: A first dust collector, which defines a first dust collection chamber (3a) and is arranged and constructed for collecting dust which is fed in with the carrier air from one side of the saw blade (14) and which is at least partly under the force of gravity At least a part of cutting fragments remaining in the first dust collection chamber (3a) under action; a cyclone unit (3c) which receives the carrying air together with the flow of remaining cutting debris which is not collected into the first dust collector, Wherein the cyclone unit (3c) comprises a cyclone main body (36), a cutting debris discharge pipe and an exhaust pipe (37); Wherein the cyclone body (36) has an inner wall and is arranged and configured for rotating the remaining cutting debris with the carrying air along the circumference of the inner wall while causing the separated remaining cutting debris to fall at least partially under the force of gravity ; Wherein the separated carrying air is discharged from the cyclone main body (36) through the exhaust pipe (37); wherein the separated remaining cutting chips are discharged from the cyclone main body (36) through the cutting chip discharge pipe; and A second dust collector, which defines a second dust collection chamber (3b), and is connected to the cutting chip discharge pipe of the cyclone main body (36), so that the separated remaining cutting chips discharged from the cutting chip discharge pipe are collected in In the second dust collection chamber (3b). 2. The saw according to claim 1, characterized in that: the dust collecting device (103) is rotatably mounted on the cover (20); and The adjustment device is operable to adjust the angle of rotation of the dust collection device relative to the cover (20). 3. The saw of claim 2, wherein: The saw also includes a base that rotatably supports the cover (20) between a lowermost position and an uppermost position; The adjustment device includes a restriction device and a support device; The restricting means is arranged and configured for restricting relative rotational movement between the cover (20) and the dust collecting device so as to rotate downwardly when the cover (20) is intermediate between the lowermost position and the uppermost position Make the dust collection device rotate together with the cover (20); and The supporting device is arranged and configured so that when the cover (20) rotates upward from the middle position, the supporting device is used to support the dust collecting device at a predetermined position relative to the base against gravity. 4. The saw of claim 3, wherein: The predetermined position is a substantially horizontal position.

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