JP6856408B2 - Driving tool - Google Patents

Description

The present invention relates to a driving tool for driving a driving material into a workpiece by driving the driving material.

There is known a driving tool configured to drive a driving material such as a nail by moving a driver in a straight line. For example, in the driving tool disclosed in Patent Document 1, a follower driven by an actuator presses a driver against a flywheel rotating below the driver. As a result, the rotational energy of the flywheel is transmitted to the driver. The driver is pushed forward along a predetermined drive shaft and a nail is driven out from the nose.

U.S. Pat. No. 9,126,319

In the above driving tool, the follower presses a specific area of the driver in the stopped state against the flywheel in the state of rotating at high speed, so that area is more likely to be worn than other parts. Therefore, from the viewpoint of improving the durability of the driver, there is room for further improvement in the above-mentioned driving tool.

An object of the present invention is to provide a technique that contributes to improving the durability of a driver in a driving tool for driving a driving material into a work piece by driving the driving material with a driver.

According to one aspect of the present invention, there is provided a driving tool configured to drive the driving material into a workpiece by driving the driving material. This driving tool includes a flywheel, a driver, a ring member, and a driver moving mechanism.

The flywheel is configured to be rotationally driven around the first axis of rotation. The driver is arranged so as to face the outer circumference of the flywheel in the radial direction of the flywheel, and is held so as to be movable between the initial position and the driving position along the operation line. The ring member is configured to be able to transmit the rotational energy of the flywheel to the driver. The driver movement mechanism is configured to move the driver relative to the ring member from an initial position to a transmission position where the ring member can transmit rotational energy to the driver.

The ring member is loosely fitted to the outer circumference of the flywheel when the driver is placed in the initial position. Further, when the driver is moved to the transmission position by the driver moving mechanism, the ring member is frictionally engaged with the driver and the flywheel, and is rotated by the flywheel around a second rotation axis different from the first rotation axis to rotate. By transmitting energy to the driver, the driver is configured to be pushed out in the driving direction from the transmission position to the driving position.

According to the driving tool having such a configuration, the driver is pushed toward the driving position by the rotational energy of the flywheel transmitted through the ring member. The ring member is loosely fitted to the flywheel when the driver is in the initial position, but when the driver is moved to the transmission position, it frictionally engages with the driver and flywheel to fly. It is rotated by a wheel. Therefore, the driver is not directly pressed against the flywheel that rotates at high speed. Therefore, the wear of the driver can be reliably suppressed. That is, the durability of the driver can be improved. When the ring member is worn, it needs to be replaced. However, since the ring member is cheaper than the driver, the cost of the replacement part can be reduced.

Further, the ring member rotates around a second rotation axis different from the first rotation axis when the rotational energy is transmitted to the driver. Therefore, since the area of the ring member that comes into contact with the flywheel at the start of transmission is not always the same, it is possible to prevent the ring member from being worn only at a specific portion.

According to one aspect of the present invention, the driving tool further includes a holding mechanism that movably holds the ring member between a separated position separated from the outer circumference of the flywheel and a contact position in which a part of the ring member contacts the outer circumference. You may. The holding mechanism holds the ring member at a separated position when the driver is placed in the initial position, and moves according to the movement of the driver when the driver is moved to the transmission position by the driver moving mechanism. The ring member may be configured to hold the ring member in a contact position.

In the driving tool of this aspect, the ring member is held in the separated position when the driver is placed in the initial position, so that the ring member is not rotated by the flywheel. On the other hand, the ring member moves to the contact position according to the movement of the driver to the transmission position and is held by the holding mechanism, and a part of the ring member contacts the outer circumference of the flywheel and is rotated. According to the holding mechanism having such a configuration, the timing of starting rotation of the ring member can be appropriately linked to the movement of the driver to the transmission position.

According to one aspect of the present invention, the transmission position may be located between the initial position and the driving position in the operation line direction. Then, the driver moving mechanism may be configured to push the driver from the initial position toward the transmission position along the operation line. According to such a configuration, since there is a transmission position in the middle of the driver moving from the initial position to the driving position along the operation line, the driver can be smoothly moved to the driving position by a series of operations.

According to one aspect of the present invention, the driving tool may further include a regulating portion that restricts the driver from moving away from the flywheel in the direction opposite to the driver and the outer circumference. The driver may have an inclined portion provided to abut the ring member in the process of moving the driver from the initial position to the transmission position. Then, the inclined portion may be configured so that the thickness of the inclined portion in the facing direction gradually increases in the direction opposite to the driving direction. According to such a configuration, the driver moves from the initial position to the transmission position in a state where the movement in the direction away from the flywheel is restricted by the regulation unit. In this process, the inclined portion whose thickness gradually increases in the direction opposite to the driving direction comes into contact with the ring member, so that the inclined portion functions as a cam and also exerts a wedge effect to put the ring member on the outer circumference of the flywheel. It can be moved efficiently toward.

According to one aspect of the present invention, the driving tool may further include a regulating portion that restricts the driver from moving away from the flywheel in the direction opposite to the driver and the outer periphery of the flywheel. The regulating unit may include a contact member configured to be able to contact the driver and an urging member that urges the driver toward the flywheel via the contact member in the opposite direction. The driver may have a contact surface that contacts the contact member as the driver moves from the transmission position to the driving position. Then, in the driver, at least a part of the region corresponding to the contact surface in the operation line direction may be formed so that the thickness in the facing direction gradually increases in the direction opposite to the driving direction. According to such a configuration, the driver moves from the transmission position to the driving position in a state of being in contact with the contact surface of the contact member and being urged toward the flywheel. At this time, since at least a part of the region corresponding to the contact surface of the driver is formed so that the thickness gradually increases in the direction opposite to the driving direction, the urging force of the urging member is increased as the driver moves. Increases. As a result, it is possible to prevent the driver from slipping with respect to the ring member due to the reaction force from the driving material.

According to one aspect of the invention, the driver may have two engaging portions extending in the direction of the line of motion across the line of motion. Then, the driving tool may include two ring members that can be engaged with each of the two engaging portions of the driver. According to such a configuration, since the two ring members engage with the two engaging portions with the operation line in between, the driver can be moved in a stable posture in the driving direction.

According to one aspect of the invention, the ring member may have a first engaging portion that can engage the driver and a second engaging portion that can engage the flywheel. The first engaging portion and the second engaging portion are configured as convex portions that can be engaged with each of a groove formed in the operation line direction of the driver and a groove formed in the circumferential direction on the outer circumference of the flywheel. You may. Alternatively, the first engaging portion and the second engaging portion are recesses that can be engaged with the ridges formed on the driver in the direction of the operating line and the ridges formed on the outer circumference of the flywheel in the circumferential direction. It may be configured. According to such a configuration, the certainty of transmission of rotational energy from the flywheel to the driver can be ensured.

According to one aspect of the present invention, the first engaging portion is configured to engage the groove or convex portion of the driver at two engaging positions in the second rotation axis direction, and the second engaging portion. The portion may be configured to engage the groove or convex portion of the flywheel at two engaging positions in the second rotation axis direction. In this case, the virtual plane orthogonal to the second rotation axis and passing through the midpoint between the two engagement positions of the first engagement portion and the driver in the second rotation axis direction is the second in the second rotation axis direction. It is preferable to pass through the midpoint between the two engaging positions of the two engaging portions and the flywheel. According to this configuration, the ring member and the driver, and the ring member and the flywheel are engaged with each other about the same virtual plane in the second rotation axis direction, so that the ring member has a stable posture with the flyhole and the driver. Can be engaged and rotated with.

According to one aspect of the present invention, both the first engaging portion and the second engaging portion may be formed symmetrically with respect to the virtual plane of the above aspect. In other words, the first engaging portion and the second engaging portion may be formed symmetrically with respect to the same position in the second rotation axis direction. According to such a configuration, it is possible to easily form a ring member capable of engaging with the fly hole and the driver in a stable posture and rotating.

It is explanatory drawing which shows the whole structure of the nail gun when the driver is arranged in the initial position. It is a perspective view from above of a driver. It is a perspective view from the bottom of the driver. It is explanatory drawing which shows the whole structure of the nail gun when a driver is arranged at a driving position. It is an enlarged view of the main body part of FIG. FIG. 5 is a perspective view of a flywheel, a ring member, a holding mechanism, and a pressing roller when the driver is in the initial position. It is a perspective view of a flywheel. It is a perspective view of a ring member. It is sectional drawing in the IX-IX line of FIG. It is an enlarged view of one of the ring members of FIG. 9 and the peripheral portion thereof. It is a perspective view of a support member. It is a perspective view of a leaf spring. It is a perspective view of a stopper. It is explanatory drawing which shows the driver and the driver drive mechanism arranged in the transmission position. It is sectional drawing in the XV-XV line of FIG. It is an enlarged view of one of the ring members of FIG. 15 and the peripheral portion thereof. It is explanatory drawing which shows the driver and the driver drive mechanism arranged in the striking position. FIG. 6 is a cross-sectional view taken along the line XVIII-XVIII of FIG. It is an enlarged view of one of the ring members of FIG. 18 and the peripheral portion thereof. It is a perspective view from above of the driver of a modification. It is a side view of the driver of a modification. It is explanatory drawing which shows the driver and the driver drive mechanism of the modification example arranged at the striking position.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the embodiment, an electric nail gun 1 will be described as an example of the driving tool. The nailing machine 1 is a tool capable of performing a nailing operation of driving a nail 101 into a work piece (for example, wood) 100) by driving the nail 101 in a straight line.

First, a schematic configuration of the nail gun 1 will be described with reference to FIG. As shown in FIG. 1, the nail gun 1 is mainly composed of a main body portion 10, a nose portion 12, a handle 13, and a magazine 17.

The main body 10 includes a housing 11, a driver 3, a driver drive mechanism 9, and a return mechanism (not shown). The housing 11 forms an outer shell of the main body 10, and houses a driver 3, a driver drive mechanism 9, and a return mechanism. The driver 3 is configured to be movable linearly along a predetermined operation line L. The driver drive mechanism 9 is configured to launch the nail 101 from the nail gun 1 by moving the driver 3 along the operation line L. The return mechanism is configured to return the driver 3 to its original position after the nail 101 is driven out.

The nose portion 12 is connected to one end of the housing 11 in the extending direction of the operation line L (hereinafter, simply referred to as the operation line L direction), and is a driver passage (not shown) penetrating the nose portion 12 in the operation line L direction. ). One end of the driver passage is open to the inside of the housing 11, and the other end is open to the outside of the nail gun 1 as an injection port 123 into which the nail 101 is ejected. At the front end of the nose portion 12, a contact arm 125 that can advance and retreat in the front-rear direction is provided adjacent to the injection port 123. The contact arm 125 is electrically connected to a contact arm switch (not shown).

The handle 13 extends from the central portion of the housing 11 in the direction of the motion line L in the direction intersecting the motion line L. The handle 13 is a portion gripped by the operator. A trigger 14 that is pulled by an operator is provided at a base end portion (end portion connected to the housing 11) of the handle 13. The trigger 14 is electrically connected to a trigger switch (not shown). Further, a battery mounting portion 15 provided with terminals and the like is provided at the tip end portion (end portion on the side opposite to the base end portion) of the handle 13. The battery 19 is detachably mounted on the battery mounting portion 15. Inside the steering wheel 13, a controller 18 or the like for controlling the driver drive mechanism 9 is arranged. The contact arm switch, the trigger switch, the motor 2, the solenoid 715, and the like described below are electrically connected to the controller 18.

The magazine 17 is configured to be able to fill a plurality of nails 101, and is attached to the nose portion 12. The nails 101 filled in the magazine 17 are supplied one by one to the driver passage by a nail feeding mechanism (not shown).

In the following description, for convenience, the L direction of the operation line of the driver 3 (horizontal direction in FIG. 1) is defined as the front-rear direction of the nail gun 1, and the side provided with the injection port 123 is the front side of the nail gun 1 ( The right side in FIG. 1) and the opposite side (left side in FIG. 1) are defined as the rear side. Further, the direction orthogonal to the operation line L direction and corresponding to the extending direction of the handle 13 (vertical direction in FIG. 1) is defined as the vertical direction of the nail gun 1, and the handle 13 is attached to the main body 10 (housing 11). The connected side (upper side in FIG. 1) is defined as the upper side, and the side where the tip end portion (end portion in which the battery 19 is mounted) of the handle 13 is arranged (lower side in FIG. 1) is defined as the lower side.

Hereinafter, details of the internal structure of the main body 10 will be described with reference to FIGS. 1 to 13. In addition, in FIG. 1 and FIG. 5, for convenience of explanation, a part of the ring member 5 described later is shown in a broken state.

First, a detailed configuration of the driver 3 will be described with reference to FIGS. 2 and 3. As shown in FIGS. 2 and 3, the driver 3 is a long member, and is formed in a symmetrical shape with respect to the long axis. The driver 3 has a main body portion 30 formed in a substantially rectangular thin plate shape as a whole, a striking portion 31 formed to be narrower in the left-right direction than the main body portion 30 and extending forward from the front end of the main body portion 30, and a main body. A pair of arm portions 35 projecting from the rear portion of the portion 30 to the left and right are included.

The main body 30 is a portion that is pressed by a pressing roller 83 (see FIG. 5), which will be described later, and frictionally engages with the ring member 5. The main body portion 30 has a pair of roller contact portions 301, a lever contact portion 305, and a pair of ring engaging portions 306. Hereinafter, these elements will be described in order.

The pair of roller contact portions 301 are integrally formed with the main body portion 30 so as to project upward from the upper surface of the main body portion 30 and extend in the front-rear direction along the left and right ends of the main body portion 30. The surface portion formed at the protruding end (upper end) of the roller contact portion 301 is formed as a contact surface that abuts on the outer peripheral surface of the pressing roller 83. Further, the front end portion of the roller contact portion 301 is formed as an inclined portion 302 whose height (thickness in the vertical direction) gradually increases toward the rear. The inclined portion 302 may be formed in a straight line as a whole in a side view, or at least a part of the inclined portion 302 may be formed in a gentle arc shape. That is, the contact surface of the inclined portion 302 may be entirely flat, may be entirely curved, or may be partially flat and partially curved. Further, the degree of inclination of the inclined portion 302 may change on the way. On the other hand, the rear portion of the inclined portion 302 of the roller contact portion 301 has a constant height. The lever contact portion 305 is provided so as to project upward from the upper surface of the main body portion 30, and extends in the left-right direction so as to connect the left and right roller contact portions 301 at the rear portion of the main body portion 30. The lever contact portion 305 is a portion where the lever 711, which will be described later, comes into contact with the lever 711 from the rear.

The pair of ring engaging portions 306 are integrally formed with the main body portion 30 so as to project downward from the lower surface of the main body portion 30 and extend in the front-rear direction along the left and right end portions of the main body portion 30. .. The front end portion of the ring engaging portion 306 is formed as an inclined portion 307 whose height (vertical direction) gradually increases toward the rear. Like the inclined portion 302, the inclined portion 307 may be formed in a linear shape as a whole in a side view, or at least a part of the inclined portion 307 may be formed in a gentle arc shape. Further, the degree of inclination of the inclined portion 307 may change on the way. The pair of ring engaging portions 306 are each formed with engaging grooves 308 that can be engaged with the outer peripheral engaging portions 51 of the two ring members 5, which will be described later. Each engaging groove 308 is formed so as to be recessed upward from the protruding end of the ring engaging portion 306, and extends in the front-rear direction over the entire length of the ring engaging portion 306. Further, the width of the engaging groove 308 in the left-right direction is narrowed upward (in other words, the wall surface of the ring engaging portion 306 defining the engaging groove 308 is approaching upward in the left-right direction). ) Is formed (see FIG. 10). The engagement mode between the driver 3 and the ring member 5 will be described in detail later.

The rear end 32 of the main body 30 defines the rear end of the driver 3. The rear end 32 is a portion that restricts the driver 3 from moving further rearward by abutting on the rear stopper portion 118 (see FIG. 1) fixed in the rear end portion of the housing 11. The front end 310 of the striking portion 31 defines the front end of the driver. The front end 310 is a portion where the head of the nail 101 (see FIG. 1) is hit, and the nail 101 is driven forward to be driven into the workpiece 100.

The pair of arm portions 35 are provided at substantially the same positions as the lever contact portion 305 described above in the front-rear direction of the driver 3, and project to the left and right of the main body portion 30. The arm portion 35 is a portion that restricts the driver 3 from moving further forward by abutting against a pair of front stopper portions 117 (see FIG. 1) fixed inside the front end portion of the housing 11. Although detailed description and illustration are omitted, the arm portion 35 is connected to the return mechanism by a connecting member. In the nail gun 1 of the present embodiment, any known configuration may be adopted as the return mechanism. For example, it is possible to adopt a return mechanism configured to pull the driver 3 that has been moved forward to the driving position to the initial position along the operation line L by the elastic force of the compression coil spring via the connecting member.

The driver 3 configured as described above is arranged so that its long axis coincides with the operation line L and extends in the front-rear direction of the nail gun 1. Further, the driver 3 is movably held between the initial position and the driving position along the operation line L (also referred to as the front-rear direction of the nail gun 1 or the long axis direction of the driver 3). ing.

Here, the initial position and the driving position of the driver 3 will be described with reference to FIGS. 1 and 4. The initial position is a position where the driver 3 is held in a state where the driver drive mechanism 9 is not operating (hereinafter, referred to as an initial state). In the present embodiment, as shown in FIG. 1, the initial position of the driver 3 is set to a position where the rear end 32 of the driver 3 comes into contact with the rear stopper portion 118. The driving position is a position where the driver 3 moved forward by the driver driving mechanism 9 drives the nail 101 into the workpiece. In the present embodiment, as shown in FIG. 4, the driving position of the driver 3 is set to a position where the front end 310 of the driver 3 slightly protrudes from the injection port 123. The driving position is also a position where the front ends of the pair of arm portions 35 come into contact with the pair of front stopper portions 117 from the rear. From the above arrangement, in the present embodiment, the initial position and the driving position can be rephrased as positions that define both ends of the moving range of the driver 3 that moves along the operation line L. The front stopper portion 117 and the rear stopper portion 118 are formed of a cushioning material in order to soften the impact when the driver 3 collides.

Hereinafter, the detailed configuration of the driver drive mechanism 9 will be described with reference to FIGS. 5 to 13. In the present embodiment, the driver drive mechanism 9 includes a motor 2, a flywheel 4, two ring members 5, a holding mechanism 6, an operating mechanism 7, and a pressing mechanism 8. Hereinafter, details of these configurations will be described in order.

The motor 2 will be described with reference to FIG. The motor 2 as a drive source is arranged in the housing 11 so that the rotation axis of the output shaft extends in the left-right direction orthogonal to the operation line L. In the present embodiment, as the motor 2, a DC motor driven by a battery 19 as a power source is adopted. A pulley 21 that rotates integrally with the output shaft is connected to the output shaft of the motor 2. In the present embodiment, when the contact arm 125 (see FIG. 1) of the nose portion 12 is pressed against the workpiece 100 and the contact arm switch is turned on, the controller 18 causes the current from the battery 19 to the motor 2. Is supplied, and the driving of the motor 2 is started.

The flywheel 4 will be described with reference to FIGS. 5 and 7. The flywheel 4 is formed in a cylindrical shape, and as shown in FIG. 5, a shaft (not shown) inserted and fixed in a through hole 40 (see FIG. 7) is inserted and fixed to the front side of the motor 2 in the housing 11. It is rotatably supported through. The flywheel 4 is rotationally driven around the rotation shaft A1 by the motor 2. The rotation axis A1 extends in the left-right direction orthogonal to the operation line L of the driver 3 in parallel with the rotation axis of the motor 2. A pulley 41 that rotates integrally with the support shaft and the flywheel 4 is connected to the support shaft of the flywheel 4. A belt 25 is bridged between the pulley 21 and the pulley 41. Therefore, when the motor 2 is driven, the rotation of the motor 2 is transmitted to the flywheel 4 via the belt 25, and the flywheel 4 rotates in the clockwise direction of FIG.

As shown in FIG. 7, the outer peripheral 45 of the flywheel 4 includes a pair of engaging grooves 47 that can be engaged with the inner peripheral engaging portion 53 of the two ring members 5, which will be described later. The pair of engaging grooves 47 are arranged apart from each other in the rotation axis A1 direction (left-right direction), are formed so as to be recessed in the radial direction (rotation axis A1), and cover the entire circumference of the flywheel 4. It is postponed. Further, the engaging groove 47 is formed so that the width in the left-right direction becomes narrower in the radial direction (in other words, the wall surface in the left-right direction defining the engaging groove 47 approaches inward in the radial direction). (See FIG. 10). The engagement mode between the flywheel 4 and the ring member 5 will be described in detail later.

The two ring members 5 will be described with reference to FIGS. 6 and 8 to 10. As shown in FIG. 6, each ring member 5 is formed in a ring shape having a diameter larger than that of the flywheel 4. In the present embodiment, the inner diameter of the ring member 5 is set to be larger than the outer diameter of the flywheel 4 (strictly speaking, the diameter from the rotating shaft A1 of the flywheel 4 to the bottom of the engaging groove 47). The two ring members 5 are arranged radially outward with respect to the flywheel 4 in a state of being separated from each other in the left-right direction so as to correspond to the pair of engagement grooves 47 of the flywheel 4. In the present embodiment, the two ring members 5 are separated from the outer circumference 45 (more specifically, the engagement groove 47) of the flywheel 4 by the holding mechanism 6 described later, and the outer circumference 45 (more specifically, the outer circumference 45). It is movably held between the contact position where a part of the groove 47) comes into contact with the groove 47).

Each ring member 5 is a member for transmitting the rotational energy of the flywheel 4 to the driver 3, and is configured to be frictionally engaged with the driver 3 and the flywheel 4. Specifically, as shown in FIGS. 8 to 10, the outer peripheral side portion and the inner peripheral side portion of the ring member 5 are respectively engaged with the engaging groove 308 of the driver 3 and the engaging groove 47 of the flywheel 4. An outer peripheral engaging portion 51 and an inner peripheral engaging portion 53 that can be fitted are provided.

As shown in FIG. 10, the outer peripheral engaging portion 51 is formed as a convex portion protruding outward in the radial direction of the ring member 5, while the inner peripheral engaging portion 53 is formed inward in the radial direction of the ring member 5. It is formed as a convex portion that protrudes toward it. Further, the radial cross-sectional shape of the ring member 5 is formed in a substantially hexagonal shape, and the outer peripheral engaging portion 51 is formed so that the thickness in the axial direction becomes smaller toward the radial outer side of the ring member 5. On the other hand, the inner peripheral engaging portion 53 is formed so that the thickness in the axial direction becomes smaller toward the inner side in the radial direction of the ring member 5. Further, in the present embodiment, both the outer peripheral engaging portion 51 and the inner peripheral engaging portion 53 are formed symmetrically with respect to the virtual plane VP orthogonal to the rotation axis A2 (see FIG. 14) of the ring member 5. ing. In other words, both the outer peripheral engaging portion 51 and the inner peripheral engaging portion 53 are configured as convex portions centered on the same position in the rotation axis A2 direction. The engagement mode between the ring member 5 and the driver 3 and the flywheel 4 will be described in detail later.

The holding mechanism 6 will be described with reference to FIGS. 5, 6 and 11 to 13. As described above, the holding mechanism 6 is configured to movably hold the ring member 5 between the separated position and the contact position. As shown in FIGS. 5 and 6, the holding mechanism 6 of the present embodiment includes a pair of ring urging portions 60 and a pair of stoppers 66.

The pair of ring urging portions 60 are configured to support the ring member 5 in a state of being urged from the lower side to the upper side. In the present embodiment, the pair of ring urging portions 60 are arranged diagonally forward and downward and diagonally backward and downward with respect to the ring member 5. Each of the pair of ring urging portions 60 includes a support member 61, a support shaft 62, and a pair of leaf springs 63.

As shown in FIG. 11, the support member 61 is formed in a cylindrical shape and has a through hole 615 extending in the axial direction. A pair of support grooves 613 for rotatably supporting the pair of ring members 5 are provided at both ends of the support member 61 in the axial direction over the entire circumference. In the present embodiment, each support groove 613 is formed as a gap between a pair of flange portions 612 protruding in the radial direction of the support member 61. As shown in FIG. 6, the support shaft 62 is inserted into the through hole 615 of the support member 61, and both ends of the support shaft 62 are fixed to the support member 61 in a state of protruding from both ends of the through hole 615. As shown in FIG. 12, the leaf spring 63 is formed in a substantially U shape as a whole.

As shown in FIG. 5, each ring urging portion 60 is arranged so that the support shaft 62 extends in the left-right direction, and both ends of the support shaft 62 are fixed in the housing 11 of the support 115 (front side). Only shown), it is supported via a leaf spring 63.

The pair of stoppers 66 are configured to restrict the upward movement of the ring member 5. As shown in FIG. 13, each stopper 66 has a pair of guide grooves 665. Each guide groove 665 is configured such that the outer peripheral engaging portion 51 of the ring member 5 is slidable inside. As shown in FIG. 6, in each of the pair of stoppers 66, the guide groove 665 faces the outer peripheral engaging portion 51 below the driver 3 and diagonally forward and upward and diagonally rearward and upward with respect to the ring member 5. Is located in.

Here, a mode of holding the ring member 5 by the holding mechanism 6 in the initial state will be described with reference to FIGS. 6, 9 and 10. As shown in FIG. 6, the outer peripheral engaging portion 51 of the ring member 5 arranged on the radial outer side of the flywheel 4 is arranged in the support groove 613 of the support member 61, respectively. The leaf spring 63 supported by the support 115 (see FIG. 5) urges the ring member 5 upward via the support shaft 62 and the support member 61. On the other hand, the pair of stoppers 66 come into contact with the outer peripheral engaging portion 51 of the ring member 5 from diagonally front and upper and diagonally rear and upper, and restrict the ring member 5 from moving further upward. As a result, the ring member 5 is held at a separated position away from the outer circumference 45 of the flywheel 4. More specifically, as shown in FIGS. 9 and 10, the ring member 5 is held at a position where the inner peripheral engaging portion 53 is slightly separated from the engaging groove 47 of the flywheel 4. Although only the upper end portion of the flywheel 4 is shown, the ring member 5 similarly extends from the outer circumference 45 of the flywheel 4 (more specifically, the engagement groove 47) over the entire circumference of the flywheel 4. It is separated.

The operating mechanism 7 will be described with reference to FIG. The operating mechanism 7 is arranged in the housing 11 above the driver 3 and behind the flywheel 4. The operating mechanism 7 is a mechanism configured to move the driver 3 arranged at the initial position to a transmission position described later. In the present embodiment, the operating mechanism 7 is mainly composed of a lever 711 and a solenoid 715.

The lever 711 is rotatably arranged with the pin 712 extending in the left-right direction as a fulcrum. The solenoid 715 is arranged on the front side of the lever 711, and has an action portion 717 that protrudes rearward from the frame 716 and can move forward and backward. In the initial state, the lever 711 is held in a state where its front end is in contact with the rear end of the acting portion 717 and its rear end is urged upward and backward by the tension coil spring 713. At this time, the rear end portion of the lever 711 is arranged above the driver 3 and behind the lever contact portion 305 of the driver 3.

In the present embodiment, when the contact arm switch (not shown) of the contact arm 125 (see FIG. 1) is turned on and the trigger 14 is pulled to turn on the trigger switch (not shown), The controller 18 (see FIG. 1) supplies current to the solenoid 715. As a result, the acting portion 717 is extended rearward, and the front end portion of the lever 711 is pressed rearward by the acting portion 717. As a result, the lever 711 rotates around the pin 712 as a fulcrum, and the rear end portion of the lever 711 presses the lever contact portion 305 of the driver 3 from the rear to the front, thereby moving the driver 3 forward. The details of the operation of the driver 3 and the driver drive mechanism 9 will be described later.

The pressing mechanism 8 will be described with reference to FIGS. 5 and 9. As shown in FIG. 5, the pressing mechanism 8 is arranged in the housing 11 so as to be above the driver 3 and facing the flywheel 4 from above. The pressing mechanism 8 is configured to restrict the driver 3 from moving away from the flywheel 4 (that is, upward). Further, the pressing mechanism 8 is a mechanism configured to press the driver 3 downward toward the ring member 5 in the process of moving the driver 3 forward from the initial position. In the present embodiment, the pressing mechanism 8 is mainly composed of a frame 81, a roller holding portion 82, a pair of pressing rollers 83, and a disc spring 85.

As shown in FIG. 9, the frame 81 is formed in a hollow shape having a storage space 811 capable of accommodating a part of the roller holding portion 82 and the disc spring 85, and is fixed in the housing 11 (see FIG. 5). There is. A pair of left and right pressing rollers 83 are rotatably supported on the lower end portion 823 of the roller holding portion 82 via a roller support shaft 84. The upper portion 821 of the roller holding portion 82 is formed in a columnar shape. A spring receiving portion 822 that projects radially outward of the upper portion 821 is formed on the lower side of the upper portion 821. The upper portion 821 is accommodated in the accommodating space 811 of the frame 81 with the disc spring 85 arranged on the outer periphery thereof. The upper end of the disc spring 85 is in contact with the lower surface of the upper wall of the frame 81, and the lower end of the disc spring 85 is in contact with the upper surface of the spring receiving portion 822. The frame 81 is provided with a locking portion 813 that projects inward of the accommodation space 811. In the initial state, the spring receiving portion 822 is urged downward by the disc spring 85 and becomes the locking portion 813. It is held in the lowest position in a state where it abuts from above and the downward movement is restricted.

Hereinafter, with reference to FIGS. 1, 4, 5, 9, 10, and 14 to 19, the operation of the nail gun 1 configured as described above, more specifically, the driver 3 The change in arrangement and the accompanying operation of the driver drive mechanism 9 (particularly, the change in the engagement mode between the ring member 5 and the driver 3 and the flywheel 4) will be described.

As described above, in the initial state of the nail gun 1, the driver 3 is arranged at the initial position shown in FIGS. 1 and 5. At this time, as shown in FIGS. 9 and 10, the ring member 5 is separated from the outer circumference 45 (more specifically, the engagement groove 47) of the flywheel 4 in the radial direction by the holding mechanism 6. It is held in. Further, the pressing roller 83 held at the lowermost position at this time is in contact with the front end portion of the main body 30 of the driver 3 in a sliding state from above, but is not in a state of pressing the driver 3 downward. .. In this state, the ring member 5 is held at a position separated from the driver 3. More specifically, the ring member 5 is held at a position where the outer peripheral engaging portion 51 is slightly separated downward from the engaging groove 308 of the driver 3.

With the driver 3 arranged at the initial positions shown in FIGS. 1 and 5, the contact arm 125 at the front end of the nose portion 12 is pressed against the workpiece 100, and the contact arm switch (not shown) is turned on. Then, the motor 2 is driven and the rotation of the flywheel 4 is started. However, at this stage, since the ring member 5 is arranged at a separated position, the rotational energy of the flywheel 4 cannot be transmitted to the driver 3. Therefore, even if the flywheel 4 rotates, the ring member 5 and the driver 3 do not operate. In other words, the ring member 5 and the driver 3 are in a stationary state.

After that, the trigger 14 is pulled by the operator, and the trigger switch (not shown) is turned on to operate the solenoid 715. As a result, the lever 711 rotates, and the rear end portion of the lever 711 presses the lever contact portion 305 of the driver 3 from the rear to the front. The driver 3 starts moving forward along the operation line L from the initial position to the driving position. The driver 3 also moves relative to the ring member 5 held at the separated position.

The pressing roller 83 abuts from the front on the contact surface of the inclined portion 302 whose thickness gradually increases toward the rear. As the inclined portion 302 moves forward while being pressed by the pressing roller 83, a part of the outer peripheral engaging portion 51 of the ring member 5 enters the engaging groove 308 (see FIG. 3) of the driver 3. It abuts on the open end of the engagement groove 308. Since the inclined portion 307 is formed at the front end portion of the ring engaging portion 306 and the width of the engaging groove 308 in the left-right direction is wider on the open end side, the outer peripheral engaging portion 51 is , Can smoothly enter the engagement groove 308. When the driver 3 moves further forward with the pressing roller 83 in contact with the contact surface of the inclined portion 302 and a part of the outer peripheral engaging portion 51 in contact with the open end of the engaging groove 308, the inclined portion 302 Functions as a cam and also has a wedge effect. Therefore, the ring member 5 held at the separated position is pushed downward against the urging force of the leaf spring 63, and the pressing roller 83 held at the lowermost position resists the urging force of the disc spring 85. And it is pushed upward.

When the driver 3 moves to the transmission position shown in FIG. 14, a part of the inner peripheral engaging portion 53 of the ring member 5 that has been moved downward enters the engagement groove 47 (see FIG. 7) of the flywheel. The ring member 5 comes into contact with the open end of the engaging groove 47, and the ring member 5 is prohibited from moving further downward. At this time, the ring member 5 is rotatably supported by the ring urging portion 60 at the lowermost position while being separated from the stopper 66, and only a part of the inner peripheral engaging portion 53 is on the upper part of the flywheel 4. It is in contact. That is, the ring member 5 is held at the contact position by the holding mechanism 6. Since the width of the engaging groove 47 in the left-right direction is wider on the opening end side, the inner peripheral engaging portion 53 can smoothly enter the engaging groove 47.

Further, as shown in FIG. 15, the ring member 5 is pressed against the flywheel 4 via the driver 3 by the elastic force of the disc spring 85 compressed by pushing up the pressing roller 83 by the inclined portion 302. ing. Therefore, as shown by points P1 and P2 in FIG. 16, a part of the outer peripheral engaging portion 51 of the driver 3 and the ring member 5 is placed in a frictional engaging state at the open end of the engaging groove 308 of the driver 3. .. Further, as shown as points P3 and P4, a part of the inner peripheral engaging portion 53 of the flywheel 4 and the ring member 5 is placed in a frictional engaging state at the open end of the engaging groove 47 of the flywheel 4. As described above, since the outer peripheral engaging portion 51 and the inner peripheral engaging portion 53 are both formed as convex portions symmetrical with respect to the virtual plane VP orthogonal to the rotation axis A2, the points P1 and P2 , Points P3 and P4 are respectively symmetrical with respect to the virtual plane VP. In other words, the virtual plane VP passing through the midpoint between the points P1 and P2 in the rotation axis A2 direction (horizontal direction) passes through the midpoint between the points P3 and P4 in the rotation axis A2 direction (horizontal direction).

By placing the ring member 5 in a frictionally engaged state with the driver 3 and the flywheel 4 in this way, the ring member 5 can transmit the rotational energy of the flywheel 4 to the driver 3. The "friction engagement state" refers to a state in which two members are engaged with each other by frictional force (including a sliding state). In the ring member 5, only the portion of the inner peripheral engaging portion 53 of the ring member 5 pressed against the flywheel 4 by the driver 3 is frictionally engaged with the flywheel 4, and the ring member 5 is around the rotation axis A2 by the flywheel 4. Is rotated to. In the present embodiment, as shown in FIG. 14, the ring member 5 is formed to have a larger diameter than the flywheel 4, and the inner diameter of the ring member 5 is the outer diameter of the flywheel 4 (strictly speaking, the flywheel). It is larger than the diameter from the rotation shaft A1 of 4 to the bottom of the engagement groove 47). Therefore, the rotation axis A2 of the ring member 5 is different from the rotation axis A1 of the flywheel 4, and is located below the rotation axis A1 (in the direction away from the driver 3). The rotation axis A2 extends parallel to the rotation axis A1. The ring member 5 pushes the driver 3 in a state of frictional engagement with the ring member 5 from the transmission position shown in FIG. 14 toward the front.

As shown in FIG. 16, the inner peripheral engaging portion 53 engaged with the flywheel 4 rotating at high speed wears more rapidly than the outer peripheral engaging portion 51 engaging with the driver 3 moving at a relatively low speed. In view of the above, the ring member 5 engages with the flywheel 4 rather than the thickness of the engaging portion with the driver 3 (the distance between the points P1 and P2 of the outer peripheral engaging portion 51 in the left-right direction). The thickness of the portion (the distance between the points P3 and the points P4 of the inner peripheral engaging portion 53 in the left-right direction) is formed to be larger. Further, in order to make it easier for the ring member 5 to engage with the flywheel 4 rotating at high speed due to the wedge effect, the inclination angle of the inclined surface (both left and right side surfaces) of the inner peripheral engaging portion 53 with respect to the vertical direction is set. It is preferable that the angle is set smaller than the inclination angle of the inclined surfaces (left and right side surfaces) of the outer peripheral engaging portion 51.

As shown in FIGS. 17 to 19, when the driver 3 is pushed forward from the transmission position and the pressing roller 83 comes into contact with the contact surface of the rear portion of the inclined portion 302 of the roller contact portion 301, the pressing roller 83 is pressed. The roller 83 is pushed up to the uppermost position, and the ring member 5 is further pressed against the flywheel 4 via the driver 3 by the elastic force of the disc spring 85. Therefore, the driver 3 and a part of the outer peripheral engaging portion 51, and the flywheel 4 and a part of the inner peripheral engaging portion 53 are in a state of being more firmly frictionally engaged. As a result, the ring member 5 can more efficiently transfer the rotational energy of the flywheel 4 to the driver 3. Note that FIG. 17 shows a state in which the driver 3 is arranged at a striking position for striking the nail 101 (see FIG. 1).

As shown in FIG. 4, the driver 3 pushed forward by the ring member 5 moves to the driving position along the operation line L, launches the nail 101 from the injection port 123, and drives it into the workpiece. When the front end of the arm portion 35 of the driver 3 comes into contact with the front stopper portion 117 from the rear, the movement of the driver 3 is stopped. The controller 18 stops the current supply to the solenoid 715 after a predetermined time required for the driver 3 to reach the striking position after the trigger switch of the trigger 14 is turned on, thereby stopping the current supply to the solenoid 715. To return to the initial position. As a result, the lever 711 also returns to the initial position. In this state, when the operator releases the pressing of the contact arm 125 (see FIG. 1) against the workpiece 100, the controller 18 stops driving the motor 2. Along with this, the rotation of the flywheel 4 is stopped, and the return mechanism (not shown) is activated to return the driver 3 to the initial position.

As described above, the nail gun 1 of the present embodiment is configured to move the driver 3 for driving the nail 101 into the workpiece from the initial position to the driving position along the operation line L. The driver drive mechanism 9 is provided. The driver drive mechanism 9 transmits the flywheel 4, a ring member configured to transmit the rotational energy of the flywheel 4 to the driver 3, and the driver 3, and the ring member 5 transfers the rotational energy to the driver 3 from the initial position. Includes an actuating mechanism 7 configured to move relative to the ring member 5 to a transmission position capable of transmitting.

When the driver 3 is arranged at the initial position, the ring member 5 is arranged loosely with respect to the outer circumference 45 (more specifically, the engaging groove 47) of the flywheel 4. Further, when the driver 3 is moved to the transmission position by the operating mechanism 7, the ring member 5 is frictionally engaged with the driver 3 and the flywheel 4, and is rotated around the rotation axis A2 by the flywheel 4 to generate rotational energy. By transmitting to the driver 3, the driver 3 is configured to be pushed forward from the transmission position to the driving position. Therefore, the driver 3 is not directly pressed against the flywheel 4 that rotates at high speed. Therefore, the wear of the driver 3 can be reliably suppressed. That is, the durability of the driver 3 can be improved. When the ring member 5 is worn, it needs to be replaced. However, since the ring member 5 is cheaper than the driver 3, the cost of the replacement part can be reduced.

Further, the ring member 5 rotates around a rotation axis A2 different from the rotation axis A1 of the flywheel 4 when the rotational energy is transmitted to the driver 3. Therefore, since the region of the ring member 5 that comes into contact with the flywheel 4 at the start of transmission is not always the same, it is possible to prevent the ring member 5 from being worn only at a specific portion.

Further, in the nail gun 1, the ring member 5 is separated from the outer circumference 45 (more specifically, the engagement groove 47) of the flywheel 4 and the outer circumference 45 (more specifically, the engagement groove 47). The holding mechanism 6 is provided so as to be movablely held between the contact positions where a part of the wheel is in contact with the wheel. The holding mechanism 6 holds the ring member 5 at a separated position when the driver 3 is arranged at the initial position, and when the driver 3 is moved to the transmission position by the operating mechanism 7, the driver 3 It is configured to hold the ring member 5 that has been moved in response to the movement at the contact position. Therefore, the ring member 5 is not rotated by the flywheel 4 when the driver 3 is arranged at the initial position. On the other hand, the ring member 5 moves to the contact position as the driver 3 is moved to the transmission position, and a part of the ring member 5 comes into contact with the outer circumference 45 (more specifically, the engagement groove 47) of the flywheel 4. It is rotated. According to the holding mechanism 6 having such a configuration, the timing of starting the rotation of the ring member 5 can be appropriately linked to the movement of the driver 3 to the transmission position.

Further, in the present embodiment, the transmission position is located between the initial position and the driving position in the operation line L direction of the driver 3. Then, the operating mechanism 7 is configured to push the driver 3 from the initial position toward the transmission position along the operating line L. That is, since the driver 3 has a transmission position in the middle of moving from the initial position to the driving position along the operation line L, the driver 3 can be smoothly moved to the driving position by a series of operations.

Further, the nail gun 1 is provided with a pressing mechanism 8 that regulates the driver 3 from moving in the direction away from the flywheel in the opposite direction (vertical direction) between the driver 3 and the outer circumference 45 of the flywheel 4. Further, the front end portion (the portion provided with the inclined portion 302) of the driver 3 is formed so that the thickness in the vertical direction gradually increases toward the rear, and the process in which the driver 3 moves from the initial position to the transmission position. It is provided so as to come into contact with the ring member 5. The front end portion (inclined portion 302) of the driver 3 functions as a cam and exerts a wedge effect to efficiently move the ring member 5 toward the outer circumference 45 (engagement groove 47) of the flywheel 4. Can be done.

In the present embodiment, two ring members 5 are provided corresponding to the left and right ends of the driver 3 extending in the direction of the operation line L with the operation line L in between. Therefore, the driver 3 can be moved along the operation line L in a stable posture.

Further, the ring member 5 has an outer peripheral engaging portion 51 configured as a convex portion that can be engaged with the engaging groove 308 of the driver 3, and a convex portion that can be engaged with the engaging groove 47 of the outer peripheral 45 of the flywheel 4. It has an inner peripheral engaging portion 53 configured as. Therefore, the certainty of transmission of rotational energy from the flywheel to the driver can be ensured. In particular, both the outer peripheral engaging portion 51 and the inner peripheral engaging portion 53 are formed symmetrically with respect to the virtual plane VP orthogonal to the rotation axis A2 of the ring member 5, respectively, of the driver 3 and the flywheel 4. And engage at two points symmetrical with respect to the virtual plane VP. Therefore, the ring member 5 can rotate by engaging with the flywheel 4 and the driver 3 in a stable posture.

The above embodiment is merely an example, and the driving tool according to the present invention is not limited to the configuration of the illustrated nail gun 1. For example, the changes illustrated below can be made. It should be noted that any one or more of these modifications may be adopted in combination with the nail gun 1 shown in the embodiment or the invention described in each claim.

For example, the configuration of the driver 3 may be changed to the driver 33 described below with reference to FIGS. 20 to 22. The driver 33 of this modification has substantially the same configuration as the driver 3 of the first embodiment (see FIG. 2) except that the configuration of the roller contact portion 330 is different from that of the roller contact portion 301 of the above embodiment. .. Therefore, the same configuration is designated by the same reference numerals to omit or simplify the description, and below, different configurations will be mainly described with reference to the drawings.

As shown in FIG. 20, the driver 33 includes a main body portion 30, a striking portion 31, and a pair of arm portions 35, similarly to the driver 3. The main body portion 30 is formed in a substantially rectangular thin plate shape as a whole, and has a pair of roller contact portions 330, a lever contact portion 305, and a pair of ring engaging portions 306.

The pair of roller contact portions 330 are provided so as to project upward from the upper surface of the main body portion 30 and extend in the front-rear direction along the left and right ends of the main body portion 30. Further, as shown in FIG. 21, the roller contact portion 330 includes a first inclined portion 332, a first straight portion 334, a second inclined portion 336, and a second straight portion 338. The first inclined portion 332 is a portion provided at the front end portion of the roller contact portion 330 in which the height in the vertical direction gradually increases toward the rear. The first straight portion 334 is a portion continuous to the rear of the first inclined portion 332, and is formed to have a constant height. The second inclined portion 336 is a portion continuous to the rear of the first straight portion 334, and is formed so that the height gradually increases toward the rear. The second straight portion 338 is a portion continuous to the rear of the second inclined portion 336, and is formed to have a constant height.

The first inclined portion 332 and the second inclined portion 336 may be formed in a linear shape as a whole in a side view, or at least a part of the first inclined portion 332 and the second inclined portion 336 may be formed in a gentle arc shape. That is, the entire upper surface (contact surface with the pressing roller 83) of the first inclined portion 332 and the second inclined portion 336 may be a flat surface, a curved surface as a whole, or a part thereof. May be a flat surface and partly a curved surface. Further, the degree of inclination of the first inclined portion 332 and the second inclined portion 336 may change in the middle.

With such a configuration of the roller contact portion 330, the driver 33 of the present modification example has a first region corresponding to the first inclined portion 332 in order from a position corresponding to the front end of the roller contact portion 330 toward the rear. It can be divided into R1, a second region R2 corresponding to the first straight portion 334, a third region R3 corresponding to the second inclined portion 336, and a fourth region R4 corresponding to the second straight portion 338. ..

The first region R1 and the third region R3 are regions in which the thickness of the driver 3 is gradually increased by the first inclined portion 332 and the second inclined portion 336, respectively. The thickness of the driver 33 is specifically the thickness of the portion of the driver 33 that is arranged between the pressing roller 83 and the ring member 5 (in other words, the upper surface of the roller contact portion 330 (the pressing roller 83). The vertical distance from the contact surface) to the engagement position of the ring member 306 with the ring member 5). The second region R2 and the fourth region R4 are regions in which the thickness of the driver 3 is constant. The first inclined portion 332 of this modified example has the same configuration as the inclined portion 302 of the above-described embodiment. Further, the height of the first straight portion 334 is the same as the height of the rear portion of the inclined portion 302 of the roller contact portion 301 of the above embodiment. Therefore, it can be said that the driver 33 of this modification is thicker than the driver 3 because the thickness is gradually increased in the third region R3.

Hereinafter, the operation of the nail gun 1 when the driver 33 of this modified example is driven by the driver driving mechanism 9 will be described with reference to FIGS. 1, 4, 14 and 22. Although the driver 3 is shown in FIGS. 1, 4, and 14, the arrangement relationship between the driver 33 and the driver drive mechanism 9 at the initial position, the transmission position, and the driving position is basically the driver 3. Since the arrangement relationship between the driver and the driver drive mechanism 9 is the same, FIGS. 1, 4, and 14 are used as they are for the description.

When the driver 33 is in the initial position, the pressing roller 83 is in the lowermost position in the roller contact portion 330 in a state of being in contact with the upper surface of the front end portion of the first inclined portion 332, as shown in FIG. It is being held. On the other hand, the ring member 5 is held at a separated position away from the ring engaging portion 306. When the trigger 14 is pulled and the lever 711 pushes the driver 33 forward, the driver 33 moves forward with the first region R1 corresponding to the first inclined portion 332 pressed by the pressing roller 83 from above. , A part of the outer peripheral engaging portion 51 of the ring member 5 comes into contact with the open end of the engaging groove 308 (see FIG. 20) of the driver 33. The driver 33 moves further forward while the first region R1 pushes the pressing roller 83 upward against the urging force of the disc spring 85 and pushes the ring member 5 downward against the urging force of the leaf spring 63. Moving.

When the driver 33 reaches the transmission position, the ring member 5 moves to the contact position, a part of the outer peripheral engaging portion 51 of the driver 3 and the ring member 5 is placed in a frictional engagement state, and the flywheel 4 and the ring member 5 are placed. A part of the inner peripheral engaging portion 53 of 5 is placed in a frictionally engaged state. At this time, as shown in FIG. 14, the pressing roller 83 is in contact with the upper surface of the rear end portion of the first inclined portion 332 of the roller contact portion 330. The driver 3 receives the rotational energy of the flywheel 4 transmitted by the ring member 5 and moves forward from the transmission position. Along with this, when the pressing roller 83 comes into contact with the upper surface of the first straight portion 334, the ring member 5 is further pressed against the flywheel 4 via the driver 3 by the elastic force of the disc spring 85. Be done. Therefore, the driver 3 and a part of the outer peripheral engaging portion 51, and the flywheel 4 and a part of the inner peripheral engaging portion 53 are in a state of being more firmly frictionally engaged. In this state, the driver 33 reaches the striking position shown in FIG.

As shown in FIG. 22, when the driver 33 is in the striking position, the pressing roller 83 is in contact with the vicinity of the boundary between the upper surface of the first straight portion 334 and the upper surface of the second inclined portion 336. Therefore, when the driver 33 hits the nail 101 and moves further forward, the pressing roller 83 comes into contact with the upper surface of the second inclined portion 336. Therefore, the driver 33 moves further forward while the third region R3 corresponding to the second inclined portion 336 pushes up the pressing roller 83 against the urging force of the disc spring 85. The driver 33 reaches the driving position shown in FIG. 4 in a state where the pressing roller 83 is pushed up to the uppermost position and is in contact with the upper surface of the second straight portion 338. At this stage, the elastic force of the disc spring 85 is maximized.

As described above, in the present modification, when the driver 33 moves from the initial position to the transmission position, the pressing roller 83 comes into contact with the upper surface of the first inclined portion 332, as in the above embodiment. The first region R1 (front end portion of the driver 33) corresponding to the contact surface is formed so that the thickness in the vertical direction gradually increases toward the rear. As a result, the first region R1 functions as a cam and exerts a wedge effect so that the ring member 5 can be efficiently moved toward the outer circumference 45 (engagement groove 47) of the flywheel 4. Further, in the present modification, the driver 33 is also provided with a third region R3 formed so that the thickness in the vertical direction gradually increases toward the rear. The third region R3 corresponds to a part of the contact surface (that is, the upper surface of the second inclined portion 336 and the second straight portion 338) that comes into contact with the pressing roller 83 when the driver 33 moves from the striking position to the striking position. doing. The driver 33 receives a reaction force (resistance) from the nail 101 until the driver 33 strikes the nail 101 at the striking position and completes the driving of the nail 101 into the workpiece 100 at the striking position. In particular, after the tip of the nail 101 is pierced by the workpiece 100, the reaction force (resistance) increases as the nail 101 is buried. On the other hand, the third region R3 pushes up the pressing roller 83 to increase the elastic force of the disc spring 85, thereby suppressing the driver 33 from slipping with respect to the ring member 5 due to the reaction force of the nail 101. Can be done.

In this modified example, when the driver 33 moves from the striking position to the striking position, the region corresponding to the contact surface (that is, the upper surface of the second inclined portion 336 and the second straight portion 338) with which the pressing roller 83 abuts. Only the third region R3, which is a part of the above, is formed so that its thickness gradually increases rearward. However, when the driver 33 moves from the transmission position to the driving position, the entire upper surface from the contact surface with which the pressing roller 83 abuts (that is, the rear end portion of the first inclined portion 332 to the rear end portion of the second straight portion 338). The other part of the region corresponding to) may be formed so that its thickness gradually increases rearward. For example, only the second region R2 may be formed so that its thickness gradually increases rearward. A part of the region including the third region R3 and the fourth region R4 may be formed so that the thickness thereof gradually increases rearward. Both the third region R3 and the fourth region R4, or the entire second region R2 to the fourth region R4 may be formed so that the thickness thereof gradually increases rearward.

The driving tool may be a tool for driving a driving material other than the nail 101. For example, it may be embodied as a tacker or staple gun that launches studs, pins, staples, or the like. Further, the drive source of the flywheel 4 is not particularly limited to the motor 2. For example, an AC motor may be adopted instead of the DC motor.

The mode of engagement between the ring member 5 and the driver 3 and the flywheel 4 is not limited to the mode exemplified in the above embodiment. For example, the number of the ring members 5 and the number of the engagement grooves 308 of the driver 3 corresponding to the ring members 5 and the engagement grooves 47 of the flywheel 4 may be 1 or 3 or more. .. Further, for example, the shapes, arrangements, numbers, engagement positions, etc. of the outer peripheral engaging portion 51 and the inner peripheral engaging portion 53, and the corresponding engaging grooves 308 and the engaging grooves 47 can be appropriately changed. For example, the outer peripheral engaging portion 51 and the inner peripheral engaging portion 53 provided on the ring member 5 are both configured as convex portions, but either one or both may be configured as concave portions. In this case, one or both of the driver 3 and the flywheel 4 may be provided with ridges that can be engaged with the recesses, corresponding to the recesses.

Further, in the above embodiment, the ring member 5 is formed to have a larger diameter than the flywheel 4. Therefore, in the radial direction of the flywheel 4, the ring member 5 is always interposed between the driver 3 and the flywheel 4, and it is possible to reliably prevent the driver 3 from coming into contact with the flywheel 4. However, if the ring member 5 and the flywheel 4 can rotate around different rotation axes while the ring member 5 is frictionally engaged with the flywheel 4, the configuration of the ring member 5 and the flywheel 4 is appropriate. It can be changed. For example, the central portion of the flywheel 4 in the direction of the rotation axis A1 is formed to have a smaller diameter than both ends, and the outer circumference of the central portion has an inner diameter larger than that of the central portion and smaller than both ends of the flywheel 4. The ring member 5 having an outer diameter may be arranged so as to be frictionally engaged. Then, the driver 3 may be configured to be frictionally engaged with the ring member 5 in a state of being separated from the flywheel 4.

The ring member 5 is arranged so that the rotational energy of the flywheel 4 cannot be transmitted to the driver 3 when the driver 3 is arranged at the initial position, and starts transmission when the driver 3 is moved to the transmission position. It suffices if it is retained. For example, the configurations of the ring urging portion 60 and the stopper 66 of the holding mechanism 6 can be changed as appropriate.

As a mechanism for moving the driver 3 from the initial position to the transmission position, a mechanism other than the operating mechanism 7 may be adopted. For example, a roller arranged above the driver 3 arranged at the initial position presses and moves the driver 3 in a direction approaching the ring member 5, so that the driver 3 is moved by the ring member 5 as a flywheel. A mechanism configured to move the rotational energy of 4 to a transmission position capable of being transmitted to the driver 3 may be adopted.

In the above embodiment, the pressing mechanism 8 uses the disc spring 85 as an urging member to press the driver 3 downward toward the ring member 5 in the process of moving the driver 3 from the initial position to the driving position. It is configured in. However, the driver 3 does not necessarily have to be pressed toward the ring member 5. For example, instead of the pressing mechanism 8, a mechanism that only restricts the driver 3 from moving in the direction away from the flywheel 4 (upward) may be provided. For example, a guide roller may be adopted that guides the driver 3 to move along the operation line L while being held immovably in the vertical direction and in contact with the driver 3 from above. Further, in the pressing mechanism 8, the number of pressing rollers 83, the type of spring, and the like may be appropriately changed.

Further, in view of the gist of the present invention and the above-described embodiment, the following configuration (aspect) is constructed. Only one or more of the following configurations may be adopted in combination with the nail gun 1 shown in the embodiment or the invention described in each claim.
[Aspect 1]
The ring member may be formed to have a diameter larger than that of the flywheel.
[Aspect 2]
The holding mechanism is
A support member that rotatably supports the ring member and
An urging member that urges the ring member supported by the support member toward the outer circumference, and
The ring member may be provided with a stopper that holds the ring member at the separated position against the urging force of the urging member.
[Aspect 3]
The driver moving mechanism is
An actuating member movably arranged between a first position separated from the driver and a second position abutting the driver.
It includes an actuator configured to move the actuating member from the first position to the second position.
The actuating member may be configured to push the driver from the initial position to the transmission position when moved from the first position to the second position by the actuator.
[Aspect 4]
The regulatory department
The contact member that comes into contact with the driver and
In the facing direction, the driver may be provided with an urging member that urges the driver toward the flywheel via the abutting member.
[Aspect 5]
The driving tool according to claim 9.
The contact surface includes a specific portion that comes into contact with the contact member while the driver moves from the position where the driver hits the driving material to the driving position.
At least a part of the area may be at least a part of the driver corresponding to the specific part of the contact surface.

The correspondence between each component of the above-described embodiment and modification and each component of the present invention is shown below. The nail gun 1 is a configuration example corresponding to the "driving tool" of the present invention. The nail 101 is a configuration example corresponding to the "driving material" of the present invention. The flywheel 4 is a configuration example corresponding to the "flywheel" of the present invention. Drivers 3 and 33 are configuration examples corresponding to the "driver" of the present invention. The ring member 5 is a configuration example corresponding to the "ring member" of the present invention. The operating mechanism 7 is a configuration example corresponding to the "driver moving mechanism" of the present invention. The holding mechanism 6 is a configuration example corresponding to the "holding mechanism" of the present invention. The pressing mechanism 8 is a configuration example corresponding to the "regulatory portion" of the present invention. The outer peripheral engaging portion 51 and the inner peripheral engaging portion 53 are configuration examples corresponding to the "first engaging portion" and the "second engaging portion" of the present invention, respectively. The engaging groove 308 and the engaging groove 47 are configuration examples of "a groove formed in the driver in the operation line direction" and "a groove formed in the circumferential direction on the outer circumference", respectively. The pressing roller 83 is a configuration example corresponding to the “contact member” of the present invention. The disc spring 85 is a configuration example corresponding to the “biasing member” of the present invention. The entire upper surface of the rear end portion of the first inclined portion 332, the first straight portion 334, the second inclined portion 336, and the second straight portion 338 is a configuration example corresponding to the “contact surface” of the present invention. The region including the rear end portion of the first region R1, the second region R2, the third region R3, and the fourth region R is a configuration example corresponding to the "region corresponding to the contact surface" of the present invention. The upper surfaces of the second inclined portion 336 and the second straight portion 338 are configuration examples corresponding to the "specific portion of the contact surface" of the present invention, and the third region R3 and the fourth region R are the "specific portions of the contact surface" of the present invention. This is a configuration example corresponding to "a region corresponding to a specific portion of the contact surface".

1: Nail gun 10: Main body 11: Housing 115: Support 117: Front stopper 118: Rear stopper 12: Nose 123: Injection 125: Contact arm 13: Handle 14: Trigger 15: Battery mounting 17 : Magazine 18: Controller 19: Battery 2: Motor 21: Pulley 25: Belt 3, 33: Driver 30: Main body 301, 330: Roller contact portion 302: Inclined portion 332: First inclined portion 334: First straight portion 336: Second inclined portion 338: Second straight portion 305: Lever contact portion 306: Ring engaging portion 307: Inclined portion 308: Engaging groove 31: Strike portion 310: Front end 32: Rear end 35: Arm portion 4: Flywheel 40: Through hole 41: Pulley 45: Outer circumference 47: Engagement groove 5: Ring member 51: Outer peripheral engaging portion 53: Inner peripheral engaging portion 6: Holding mechanism 60: Ring urging portion 61: Support member 612: Flange 613: Support groove 615: Through hole 62: Support shaft 63: Belleville spring 66: Stopper 665: Guide groove 7: Acting mechanism 711: Lever 712: Pin 713: Tension coil spring 715: Solenoid 716: Frame 717: Acting part 8 : Pressing mechanism 81: Frame 811: Accommodating space 813: Locking portion 82: Roller holding portion 821: Upper portion 822: Spring receiving portion 823: Lower end portion 83: Pressing roller 84: Roller support shaft 85: Belleville spring 9: Driver drive mechanism 100: Work piece 101: Nail A1: Rotation axis A2: Rotation axis L: Operation line VP: Virtual plane R1: First region R2: Second region R3: Third region R4: Fourth region

Claims (9)

It is a driving tool configured to drive the driving material into the work piece by driving the driving material.
A flywheel that is rotationally driven around the first axis of rotation,
A driver that is arranged to face the outer circumference of the flywheel in the radial direction of the flywheel and is movably held between an initial position and a driving position along an operation line.
A ring member configured to be able to transmit the rotational energy of the flywheel to the driver, and
The driver is provided with a driver moving mechanism configured to move the driver relative to the ring member from the initial position to a transmission position where the ring member can transmit the rotational energy to the driver.
When the driver is arranged at the initial position, the ring member is arranged so as to be loosely fitted with respect to the outer circumference.
When the driver is moved to the transmission position by the driver moving mechanism, the ring member frictionally engages with the driver and the flywheel, and the second rotating shaft different from the first rotating shaft by the flywheel. A driving tool characterized in that the driver is configured to be rotated around and transmit the rotational energy to the driver to push the driver in the driving direction from the transmission position to the driving position. The driving tool according to claim 1.
Further, a holding mechanism for holding the ring member movably between a separation position separated from the outer circumference of the flywheel and a contact position in which a part of the flywheel comes into contact with the outer circumference is provided.
The holding mechanism is
When the driver is arranged at the initial position, the ring member is held at the separated position and the driver is held at the separated position.
A driving tool characterized in that when the driver is moved to the transmission position by the driver moving mechanism, the ring member moved in response to the movement of the driver is held at the contact position. The driving tool according to claim 1 or 2.
The transmission position is located between the initial position and the driving position in the operation line direction.
The driver moving mechanism is a driving tool characterized in that the driver is configured to push out the driver from the initial position toward the transmission position along the operation line. The driving tool according to claim 3.
Further provided with a regulating unit that regulates the driver from moving away from the flywheel in the direction opposite to the driver and the outer circumference.
The driver has an inclined portion provided so as to come into contact with the ring member in the process of moving the driver from the initial position to the transmission position.
A driving tool characterized in that the thickness of the inclined portion in the facing direction gradually increases in a direction opposite to the driving direction. The driving tool according to claim 3.
Further provided with a regulating unit that regulates the driver from moving away from the flywheel in the direction opposite to the driver and the outer circumference.
The restricting portion includes a contact member configured to be able to contact the driver and an urging member that urges the driver toward the flywheel via the contact member in the facing direction. ,
The driver has a contact surface that comes into contact with the contact member when the driver moves from the transmission position to the driving position.
Among the drivers, at least a part of the region corresponding to the contact surface in the operation line direction is formed so that the thickness in the facing direction gradually increases in the direction opposite to the driving direction. Driving tool. The driving tool according to any one of claims 1 to 5.
The driver has two engaging portions extending in the direction of the motion line with the motion line in between.
A driving tool comprising two ring members that can be engaged with each of the two engaging portions of the driver. The driving tool according to any one of claims 1 to 6.
The ring member has a first engaging portion that can be engaged with the driver and a second engaging portion that can be engaged with the flywheel.
The first engaging portion and the second engaging portion are
The driver is configured as a convex portion that can be engaged with each of a groove formed in the operation line direction and a groove formed in the circumferential direction on the outer periphery of the flywheel.
A driving tool characterized in that the driver is configured as a ridge formed in the operation line direction and a recess formed on the outer periphery of the driver in the circumferential direction so as to be engaged with each of the ridges. The driving tool according to claim 7.
The first engaging portion is configured to engage the groove or the convex portion of the driver at two engaging positions in the second rotation axis direction.
The second engaging portion is configured to engage the groove or the convex portion of the flywheel at two engaging positions in the second rotation axis direction.
The virtual plane orthogonal to the second rotation axis and passing through the midpoint between the two engagement positions of the first engagement portion and the driver in the second rotation axis direction is the second rotation axis direction. A driving tool characterized in passing through an intermediate point between the two engaging positions of the second engaging portion and the flywheel in the above. The driving tool according to claim 8.
A driving tool characterized in that both the first engaging portion and the second engaging portion are formed symmetrically with respect to the virtual plane.

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