JPH08229882A - Sheet material cutting device - Google Patents

Abstract

PURPOSE: To perform the forced rotation of a disc positively at low cost and reciprocate a disc blade holding base smoothly so as to reduce the driving loss of a motor by combining a timing belt with a pulley to forcibly rotate the disc blade for cutting sheet material. CONSTITUTION: A cutter for cutting sheet material 7 is made a disc blade 1, and a mating blade is made a second disc blade 21 to constitute a slitter type cutting device. A disc blade holding base 3 is slidably fitted to a guide rail formed integrally with a frame 4, and a drive source 5 is disposed at one end part of the cutting device. When the motor 51 of the drive source 5 is driven, a gear 53 and a driving side pulley 54 are rotated through a pinion gear 52, and a timing belt 6 is also rotated. The disc blade holding base 3 is thereby moved, and the sheet material 7 is cut by the cooperation of the disc blade 1 and second disc blade 21. The cutting of the sheet material 7 is stabilized by thus actuating the disc blade 1 itself.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is to press the blade edges of disk blades into contact with each other, or press the blade edges of disk blades into contact with a fixed blade having a straight blade edge to reciprocate the disk blades left and right. ,paper,
The present invention relates to a sheet material cutting device that cuts a sheet material such as cloth and film.

[0002]

2. Description of the Related Art A sheet material cutting apparatus is structurally mainly composed of a roller type, a rotary type, a slide type (guillotine type),
It is classified into a slitter type or the like, and an optimal structure is appropriately selected and used according to the application. Among them, a cutting device that resembles a slitter type that presses a disc blade against a straight fixed blade to reciprocate the disc blade left and right and freely rotates the disc blade by press contact force is well known. ing.

This sheet material cutting device comprising a disc blade and a straight fixed blade is also called a roller type, and is slidably held by a guide rail provided parallel to the longitudinal direction of the straight fixed blade. A disc blade is rotatably supported on the disc blade holding table so as to be freely rotatable. Then, by transmitting the driving force to the disc blade holder, the fixed blade and the disc blade among the disc blades pressed against each other move to the left and right, and are inserted between the fixed blade and the guide rail. The cut sheet material. As a cutting device having this structure, the one described in Japanese Patent Publication No. 50-24466 is known.

Further, in a slitter type sheet material cutting device composed of a pair of disc blades, a disc blade holding base is slidably supported by a guide rail provided in parallel with the cutting direction. On the blade holder, a pair of disc blades are pivotally supported so that they can rotate freely and the tips of the blades are in pressure contact with each other. When the disc blade holder moves to the left and right, and when it moves in the cutting direction, the sheet material is cut by rotating in the direction in which the sheet material is bitten. As a cutting device having this structure, the one described in JP-A-5-177585 is known. In the slitter type sheet material cutting device as described above, it is necessary to forcibly rotate at least one disc blade. Further, in the roller-type sheet material cutting device, the disc blade naturally rotates due to the frictional force between the disc blade and the fixed blade. In some cases, the structure is forcibly rotated so that it can be cut.

In the forced rotation mechanism of the disc blade, the disc blade is arranged so as to come into pressure contact with the guide rail and the fixed blade via a roller,
When the disc blade holder and the disc blade holder move along the guide rail, the rollers rotate due to frictional force, and this rotation causes the disc blade to be forcibly rotated.
-17091. Furthermore, the actual fair 4-
No. 22955 is a sheet material cutting device in which pulleys are provided at both ends of a cutting device, and wires are attached to the pulleys so as to circulate in a ring shape, and the disk blade holding table is moved by the operation of the wire. Cutting that presses the wire against a pulley that is integrally attached and rotates coaxially, and installs two idle pulleys for the purpose of increasing the pressing force and operates the disc blade holder to forcibly rotate the disc blade The device is described. On the other hand, the applicant proposed a roller-type cutting device in Japanese Patent Application No. 6-238792, and moves the disc blade holding base using a timing belt, but the disc blade does not rotate by force, and the straight blade is straightened. It is designed to rotate when pressed against a fixed blade. That is, the disc blade moves back and forth due to the movement of the disc blade holding base by the timing belt, but the rotation is free rotation due to the frictional force with the fixed blade.

[0006]

In recent years, facsimiles, printers, etc. equipped with a sheet material cutting device have been downsized,
Lighter weight and lower price are required, and accordingly, the sheet material cutting device also needs to be smaller, lighter and lower in price, and various measures are taken. In the slitter type cutting device in which the disc blade is pressed against the disc blade, one of the disc blades must be forced to rotate, and in the roller type cutting device in which the disc blade is pressed against the straight fixed blade. , It is not necessary to forcibly rotate the disc blade because it rotates naturally if the disc blade is pressed against the fixed blade and moves, but if the disc blade is forcibly rotated, smoother cutting can be achieved. Since it is possible, a forced rotation device may be attached to the disc blade. Also, regarding this forced rotation device, from the viewpoint of downsizing, weight reduction, and cost reduction of the entire device, it is a device that does not increase various parts, is easy to manage, and is capable of reliably rotating the disc blade. Will be required.

In the cutting device disclosed in Japanese Utility Model Laid-Open No. 4-17091, the number of parts is increased and the frictional force alone is used for forced rotation, so that environmental conditions change (for example, temperature rise). Also, there is a drawback in that the rotational force applied to the disc blade changes due to changes in the contact area and pressure associated therewith, and a stable rotational force cannot be obtained. Therefore, in the cutting device described in Jpn. Pat. Appln. KOKAI No. 4-22955, two separate rollers are provided in order to strongly press the wire against the pulley. However, because the structure is simply pressing the wire against the pulley, in some situations, slippage may occur between the wire and the pulley, causing uneven rotation of the disk blade and uneven movement of the disk blade support. In some cases, smooth cutting may not be possible, or the initial purpose of obtaining smooth cutting may not be achieved due to variations in the required cutting time. SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems of the conventional cutting device, and to provide a sheet material cutting device having an inexpensive and reliable disc blade forced rotation mechanism and a disc blade holding table moving mechanism. .

[0008]

Means for Solving the Problem
The cutting device that proposed the mechanism of the sensor that detects the position of the disc blade in No. 238792 also has unstable rotation because the disc blade is pressed against the straight fixed blade and rotates only by friction with the mating blade. Therefore, we studied to obtain stable rotation. As a result, they have found that the disc blade should be rotated by utilizing the reciprocating movement of the timing belt for moving the disc blade holder. The disc blade pulley is pivotally supported integrally with the disc blade, and the movement of the timing belt is transmitted to the disc blade pulley. Therefore, of the reciprocating movements of the timing belt in the present invention, one has a mechanism for moving the disc blade holder and the other has two driving functions for rotating the disc blade.

Specifically, according to the present invention, specifically, a disc blade is rotatably supported integrally with a disc blade pulley on a disc blade holding base, and a driving side mounted near both ends of a cutting device. A pulley, a driven pulley, and the disc blade holder are mounted, and a timing belt that is stretched around the drive pulley and the driven pulley to rotate the disc blade pulley and the disc blade The sheet material cutting device comprises a mating blade that is pressed against and cuts the sheet material, and the timing belt moves by the rotation of the driving pulley to rotationally drive the disc blade. Then, normally, as a counterpart blade that is pressed against each other with the disc blade to cut the sheet material, a second circle that is rotatably supported by the disc blade holding base together with the disc blade and moves simultaneously with the disc blade. A plate blade or a fixed blade having a straight cutting edge parallel to the cutting direction of the sheet is used.

The method of transmitting a rotational driving force using a timing belt having a tooth profile is widely used in various mechanical devices. In the slitter type or roller type cutting device to which the present invention is applied, the conventional timing belt is
The only function was to move the disc blade holder.
However, according to the present invention, when the timing belt having the disc blade holder mounted thereon reciprocates, the movement is utilized to simultaneously rotate the disc blade supported by the disc blade holder. It is a mechanism. Then, by using the reciprocating motion of the timing belt together to drive the disc blade, as compared with the conventional unstable sheet cutting device in which the disc blade rotates due to the frictional force with the mating blade, This realizes a sheet material cutting device with much higher cutting stability.

[0011]

A pulley is provided at both ends of the sheet material cutting device, and an endless ring-shaped timing belt is stretched around the pulley. A disc blade holder is attached to this timing belt. If the same tooth profile as the timing belt is formed in the portion of the disc blade holder that is attached to the timing belt, the disc blade holder can be attached to the timing belt reliably. When a timing belt equipped with a disc blade holder is stretched over pulleys provided at both ends of the cutting device, a circle is formed coaxially with the disc blade at a position opposite to the mounting position of the disc blade holder. The disc blade pulley integrally mounted with the plate blade and the timing belt are pressed against each other.

With such a structure, when the timing belt is operated by the drive unit to move the disc blade holder, the timing belt at the position pressed by the disc blade pulley is opposite to the disc blade holder. Since the disk blade pulley is pressed against the belt, the disk blade pulley is rotated in the direction in which the sheet material is forcibly engaged with the sheet material to enable smooth cutting. In the sheet material cutting device having such a structure, the timing belt needs to be stretched around the pulleys arranged at both ends of the cutting device. And
Since the disc blade that is driven to rotate must be close to the sheet material to be cut, the timing belt that goes around the pulley is closer to the sheet material, and the disc blade that is integrally attached to the disc blade is The pulley is pressed against the sheet material, and the disc blade holder is mounted at a position distant from the sheet material. Furthermore, when the timing belt is rotated around the pulleys at both ends of the sheet material cutting device, the passage of the sheet material is arranged outside the ring-shaped timing belt.

[0013]

The present invention will now be described in more detail with reference to the examples and the drawings. 1 and 2 are views showing a first embodiment of the present invention, FIG. 1 is a perspective view of a slitter type sheet material cutting device according to the present invention, and FIG. 2 is a sectional view of the vicinity of a disc blade holder. is there. In FIGS. 1 and 2, the blade directly involved in the cutting of the sheet material is the disc blade 1 and the mating blade 2 is the second disc blade 21, which is a normal slitter type cutting device. The frame 4 is made of sheet metal and is bent, and the disc blade holding base 3 is slidably attached to a guide rail 41 integrally formed with the frame 4. Disk blade holder 3 is holder A
31, holding table B32, holding table C33 and holding table D34
Each member is assembled and molded, and the disc blade 1 and the second disc blade 21 are rotatably supported on the disc blade holding base 3 through the disc blade supporting shaft 13 and the second disc blade supporting shaft 21a. Then, the blade edges were pressed against each other by the spring 12. Further, a disc blade pulley 11 is integrally fixed to the disc blade 1.

On the motor 51 side of the drive source 5 at one end of the cutting device, a gear 53 and a drive side pulley 54 are integrally fixed and arranged, and on the opposite side of the motor 51, a driven side pulley is provided. 55 is rotatably supported on the frame 4, and a ring-shaped timing belt 6 is attached so as to circulate the drive pulley 54 and the driven pulley 55. Its timing belt 6
61 of the sheet material, which is separated from the sheet material, is attached to the holding table D34 so as to be fixed, and the one 62, which is closer to the sheet material, is pressed against the disc blade pulley 11 that is coaxially integrated with the disc blade 1. I chose

When the motor 51 is rotated, the gear 53 and the driving pulley 54 are rotated via the pinion gear 52 and the timing belt 6 is operated, so that the disc blade holder 3 is moved from right to left in the drawing. Then, the disc blade 1 and the second disc blade 21 cooperate to cut the sheet material 7. Since the disc blade pulley 11 is rotated by the operation of the timing belt 6 at this time, the disc blade 1 is given a rotational force in the direction in which the sheet material 7 is bitten and is forcedly rotated. In the conventional cutting device, since the rotation of the disc blade depends on the frictional force with the mating blade, the rotation tends to be unstable and the cutting tends to be unstable. In the present invention, since the disc blade itself is driven by the timing belt, it is possible to surely perform stable rotation, which in turn enables stable cutting of the sheet material. After the cutting, by changing the polarity of the input power source to the motor 51, the motor 51 reversely rotates and the disc blade holder 3 moves from the left to the right of the cutting device on the drawing to return to the standby position.

3 and 4 are views showing a second embodiment of the present invention. FIG. 3 is a perspective view of a roller type cutting device according to the present invention, and FIG. FIG. In this embodiment, the frame 4 is made of sheet metal and is bent,
A fixed blade 22 having a straight cutting edge line which is the mating blade 2 in parallel with the guide rail 41 integrally formed with the frame 4.
Attached. The disc blade holder 3 slidably attached to the guide rail 41 is formed of two members, a holder A31 and a holder B32, and the disc blade 1 is mounted via the disc blade support shaft 13. It is rotatably supported and its blade edge is fixed to the fixed blade 22 by a spring 1.
Pressed by 2.

Similar to the first embodiment, a drive side pulley 54 and a driven side pulley 55 are arranged at both ends of the cutting device, and a ring-shaped timing belt 6 is attached to the pulley so as to circulate. The distant 61 is attached so as to be fixed to the holding base A31, and the 62 closer to the sheet material 7 is pressed against the disc blade pulley 11 attached so as to be coaxially integrated with the disc blade 1. The disc blade 1 was forced to rotate. Therefore, similarly to the first embodiment, by rotating the motor 51, the disc blade holding base 3 is actuated and the disc blade 1 is rotated in the direction in which the sheet member 7 is bitten, so that the sheet member 7 is rotated. Can be cut smoothly.

FIG. 5 shows the concept of the combination state of the timing belt 6 and the disc blade holder 3 and the meshing state of the timing belt 6 and the disc blade pulley 11 in the sheet material cutting apparatus of the present invention. It is a figure demonstrated using the slitter type cutting device shown in FIG. If the tooth profile of the timing belt is processed into a part of the disk blade holder 3 and the tooth profile of the timing belt is fitted into this tooth profile, the disk blade holder can be attached to the timing belt. Can be done easily and reliably. Further, if the disc blade pulley 11, the drive side pulley 54, and the driven side pulley 55 are provided with the same tooth profile as the timing belt, the transmission of drive becomes more reliable.

With such a structure, when the disc blade pulley 11 is rotated by the timing belt 6, a force in the direction of disengagement from the timing belt 6 may be exerted. So that the blade 1 rotates
As shown in FIG. 6, a backup 8 may be provided on the opposite side so as to sandwich the timing belt 6 together with the disc blade pulley 11. As the backup, various things such as a flat plate shape and a roller shape may be arbitrarily used as shown in FIG.

[0020]

As described above, according to the sheet material cutting apparatus of the present invention, not the conventional forced rotation of the disc blade only by the frictional force using the wire but the forced rotation of the combination of the timing belt and the pulley. Therefore, it is possible to obtain inexpensive and reliable forced rotation of the disc blade, and use a timing belt that is often used to transmit the rotational force from one shaft to the other, and use the disc blade for the timing belt. By using the structure in which the holding base is fixed and the disc blade pulley is also combined, the reciprocating movement of the disc blade holding base can be performed smoothly and reliably, so that the driving force of the motor is not lost.
Further, since the timing belt is made of a material that does not produce any sound in terms of composition, a noise-free cutting device can be obtained.

[Brief description of drawings]

FIG. 1 is a perspective view of a slitter type cutting device showing a first embodiment of a sheet material cutting device of the present invention.

FIG. 2 is a sectional view of a slitter type cutting apparatus showing a first embodiment of the sheet material cutting apparatus of the present invention.

FIG. 3 is a perspective view of a roller type cutting device according to a second embodiment of the sheet material cutting device of the present invention.

FIG. 4 is a cross-sectional view of a roller type cutting device according to a second embodiment of the sheet material cutting device of the present invention.

FIG. 5 is a conceptual diagram showing a state of combination with a timing belt according to the sheet material cutting device of the present invention.

FIG. 6 is a schematic view of an apparatus for preventing the timing belt from coming off according to the sheet material cutting apparatus of the present invention.

[Explanation of symbols]

1 disc blade, 11 disc blade pulley, 12 spring, 13
Disc blade shaft, 2 counter blades, 21 2nd disc blade, 21a 2nd disc blade support shaft, 22 fixed blade, 3 disc blade holding base, 31
Holding table A, 32 Holding table B, 33 Holding table C, 34
Holding base D, 4 frames, 41 guide rails, 5 drive sources, 51 motors, 52 pinion gears, 53 gears,
54 drive side pulley, 55 driven side pulley, 6 timing belt, 61 part far from sheet material, 62 part close to sheet material, 7 sheet material, 8 backup

Claims (2)

[Claims] 1. A disc blade rotatably supported integrally with a disc blade pulley on a disc blade holder, and a drive side pulley and a driven side pulley mounted near both ends of a cutting device.
The disc blade holder is mounted, and the timing belt that is stretched around the drive-side pulley and the driven-side pulley to rotate the disc blade pulley and the disc blade is pressed against each other to form a sheet material. A sheet material cutting device comprising a mating blade to be cut, and the timing belt moves by the rotation of a drive side pulley to rotationally drive the disc blade. 2. A second blade which is pressed against the disk blade to cut the sheet material and is rotatably supported by the disk blade holder together with the disk blade so as to move simultaneously with the disk blade. The sheet material cutting device according to claim 1, wherein the sheet material cutting device is a disc blade or a fixed blade having a straight cutting edge line parallel to a cutting direction of the sheet.