JPH1177585A - Sheet member cutting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a spiral drive sheet member cutting device to stably cut a wide sheet member. SOLUTION: A shaft body 1 furnishing a spiral guide route 2 formed by combining reverse spirals each other at the outer diameter is driven to rotate, a moving body 4 having an engaging member 18 engaged to the spiral guide route 2 is moved along a guide rail 3, and cutting edges 5a and 5b supported to the moving body 4 are reciprocated to cut a sheet member. A bracing member 21 furnishing bracing bearings 21a and 21b of the shaft body 1 is provided, and the bracing bearings 21a and 21b are provided to hold the front and the rear sides in the reciprocating direction of the moving body 4, and installed movable to reciprocate to the guide rail 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet material cutting apparatus incorporated in OA equipment such as a copying machine, a printer, a facsimile, etc., and more particularly to a cutting apparatus which moves a cutting blade by driving a spiral shaft. The present invention relates to a blade-movable sheet material cutting apparatus for cutting a wide sheet material.

[0002]

2. Description of the Related Art O copiers, printers, facsimile machines, etc.
As a sheet material cutting device mounted on the apparatus A, a circular blade or a knife-shaped blade is pressed against a fixed blade to move and cut (Japanese Utility Model Application Laid-Open No. 4-128195), or a blade edge is pressed. There is a cutter moving type cutting device which cuts a sheet material by moving a tool rest having two circular blades (Japanese Patent Laid-Open No. 7-52085). Such blade-moving type cutting devices require less power to drive the blades than other rotary and slide type sheet material cutting devices, and there are few restrictions on the cutting width. This is advantageous in that it can be performed.

As a means for moving the blade of such a blade moving type cutting device, a moving device that reciprocates by pulling a tool post with a wire or a toothed belt has been used. At the time of conversion, there is a problem that the tool post collides with a stopper or the like due to inertia, generating noise and lacking quietness. Therefore, the present applicant has developed a helical shaft corresponding to a male screw and a cutting device driven by an engaging member corresponding to a screw to be provided on the turret, and further, a helical guide of the shaft. Disclosed is a screw driven type excellent sheet material cutting device which excels in quietness by reciprocating a tool post simply by rotating a shaft body in one direction by using a reciprocating screw having windings opposite to each other (Japanese Patent Application Laid-Open No. 9-123090). .

[0004]

However, with the demand for a lighter and smaller cutting device, the diameter of the helical shaft of the screw-driven moving device has also been reduced, and in particular, a long sheet material for cutting a wide material. In the cutting device, there is a problem that the helical shaft causes rotational runout at an intermediate portion in the longitudinal direction. Further, the cutting device in which the spiral guide path of the shaft is a reciprocating screw has the advantage that the mechanism is simplified and the quietness is increased. There is a problem in that the bending strength of the shaft body is smaller than that of the shaft body having the spiral groove, and rotational runout is likely to occur. On the other hand, since the moving body is driven by the spiral shaft and reciprocates, there is a problem that a steady rest cannot be provided at an intermediate portion of the shaft.

[0005] In order to solve the above-mentioned problems, the present invention has studied a steady rest which does not hinder the movement of the moving body by moving the steady rest of the helical shaft together with the moving body. It is another object of the present invention to provide a quiet blade-moving sheet material cutting apparatus capable of performing stable cutting without causing rotational vibration of a screw shaft body.

[0006]

In order to achieve the above object, a sheet material cutting apparatus according to the present invention rotates a shaft provided with a spiral guide path on its outer diameter to engage with the spiral guide path. Moving the moving body having the mating engaging portion along the guide rail,
In a sheet material cutting apparatus for cutting a sheet material by reciprocating a cutting blade supported by the moving body, a plurality of steady rest bearings for preventing rotational runout of the shaft body are connected at predetermined intervals. A stop member, wherein the steady rest member is disposed so that the plurality of steady rest bearings are spaced at predetermined intervals before and after in the reciprocating direction across the moving body, and is mounted on the guide rail so as to be reciprocally movable. It is characterized by having.

In a blade moving type cutting device for moving a moving body supporting a blade by a helical shaft such as a screw shaft, the shaft is small in diameter and the length of the shaft is long due to wide cutting. However, there has been a problem that rotational run-out occurs near the center of the shaft body and noise is generated, and stable cutting cannot be performed. In the sheet material cutting device of the present invention, a plurality of steady rest bearings supporting the shaft are provided at predetermined intervals before and after in the reciprocating direction so as to sandwich the moving body. Is supported, and even in the case of a long helical shaft, rotation of the shaft is prevented.

The steady rest member provided with the steady rest bearing is mounted on the guide rail so as to be reciprocally movable, and at the cutting stand-by position, of the steady rest bearings, the rearwardly advanced bearing is pivoted at the end of the starting end side of the shaft. The bearing at the front of the axle supports a substantially central portion of the shaft body. Even if the moving body moves after the cutting starts, the steadying member does not move at first, so that the cutting proceeds while the steady rest bearing in front of the axle supports the substantially central portion of the shaft body. When the cutting progresses and the moving body moves substantially near the center, the moving body hits the steady-state bearing in front of the moving body and moves the steady member together with the moving body. As a result, the steady rest bearing at the advancing rear moves from the rear end toward the center while supporting the rear of the shaft body. When the moving body reaches the end point after the cutting is completed, the steady rest bearing in front of the steady rest member supports the end point side end of the shaft body, and the steady rest bearing in the rear pivots almost in the center. Become. The same applies to the case where the mobile body moves on the return path after the cutting is completed. Therefore, during the reciprocating movement of the moving body, any one of the steady rest bearings of the steady rest member always supports the vicinity of the central portion of the shaft body, so that the rotational shake can be prevented. The starting point of the cutting
In order to support the central portion of the shaft body where the rotational runout becomes the largest at the end point, it is desirable that the interval between the plurality of anti-vibration bearings of the anti-vibration member is set to approximately 1/2 of the moving distance.

The guide rail of the sheet material cutting device according to the present invention is formed of a profile member having a hollow cross section extending in the direction of the reciprocating path, and the shaft is disposed within the hollow cross section of the guide rail. Has a sliding portion that slides and moves on the inner surface of the hollow section of the guide rail, and the sliding portion is provided with an engaging member that engages with the spiral guide path. It is desirable that a plurality of steady rest bearings are disposed at predetermined intervals before and after in the reciprocating direction across the sliding portion, and are slidably mounted in the hollow section.

[0010] That is, if the shaft is disposed in the guide rail having a hollow cross section as described above, the rotating portion is not exposed, which is safe and advantageous for miniaturization, and the engaging member provided on the sliding portion of the moving body. Is engaged with the spiral guide path of the shaft body, and the sliding portion is driven by sliding the inner surface of the guide rail, so that the upper surface of the guide rail can be used as the mounting surface of the sheet to be cut when cutting. In addition, it is easy to provide a free-set structure that can be cut simply by placing the sheet to be cut on the upper surface of the guide rail. Further, with such a structure, it is easy to dispose the steady rest member slidably in the hollow cross section, and the steady rest bearing easily and reliably supports the shaft body.

It is desirable that the steadying member be a U-shaped member provided with the steadying bearings at both ends of the legs in order to achieve the above object with a simple and inexpensive structure.

Further, the present invention relates to a structure in which the spiral guide path is reversely wound at least at one end so that the movable body is driven to reciprocate by one-directional rotation of the shaft body. The present invention is more effective when applied to a sheet material cutting device formed by a spiral in the forward direction and a spiral in the backward direction. That is, with such a structure, the moving body can reciprocate by rotating the shaft body in one direction. Therefore, the reciprocating conversion of the moving body can be performed without reversing the rotation driving means of the shaft body, and a switching mechanism of the reciprocating direction of the driving means is not required, thereby simplifying the moving body. A quiet cutting device can be obtained without generating noise due to collision with the like. On the other hand, since the reciprocating spiral is formed in the shaft having the above-described configuration, there is a disadvantage that the bending strength is lower than that of a normal one-way spiral, and the shaft easily swings. By adopting the structure using the steady rest member, the disadvantage is covered, and the effect of the reciprocating spiral is further utilized.

Further, the sheet material cutting apparatus of the present invention cuts the sheet material by slidingly contacting the cutting edges of a first disk blade and a second disk blade rotatably supported by a moving body. Or a sheet for cutting a sheet material by sliding one movable disk blade rotatably supported by a moving body or a knife-shaped movable blade mounted on the moving body against a substantially linear fixed blade edge. Any of them can be applied to a material cutting device.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a conceptual diagram of the assembly of the sheet material cutting device according to the embodiment of the present invention, FIG. 2 is a front view of the sheet material cutting device, and FIG. 3 is a diagram for explaining the operation of the steadying member.

In these figures, a hollow rod 3 having a substantially U-shaped cross section forms a guide rail, and a shaft body 1 is included in the U-shaped hollow cross section of the hollow rod 3, and both shaft ends are hollow. The rod 3 is rotatably supported by a bearing 11 mounted on a side plate 12 opposite to the end plate 3 a of the rod 3. The spiral guide path 2 provided on the outer diameter of the shaft body 1 is formed by a curved groove in which the spiral in the forward direction and the spiral in the backward direction are continuous at the start point and the end point in the forward direction. That is, the spiral guide path 2 is formed of two endless guide paths having opposite twist directions.
Thus, the moving body 4 reciprocates simply by rotating the helical shaft body in one direction.

The moving body 4 is provided with a sliding portion 4a, and the sliding portion 4a is arranged to slide on the inner surface of the hollow U-shaped section of the hollow rod 3 to reciprocate the moving body 4. . Sliding part 4a
The shaft body 1 is inserted through the insertion hole 4c provided in the
A movable body guiding member 18 serving as an engaging member is rotatably mounted in a hole (not shown) orthogonal to c. Two projections 18a forming an engagement portion provided on the moving body guiding member 18 are
The movable body 4 is moved by the rotation of the shaft body 1 by engaging with the spiral guide path 2 of the shaft body 1 inserted into the insertion hole.

The moving body 4 is provided with a first disk blade shaft 9.
An elastic roller 6a that rotates integrally with the first disk blade 5a is rotatably supported on the first disk blade shaft 9 by the shaft hole of the main body and the shaft hole of the lid 16. Further, a coil spring 8 for urging the blade edge of the first disk blade 5a so as to press against the second disk blade 5b is provided. Also, the second disk blade shaft 1
0 is implanted in the shaft hole of the main body of the moving body 4 and the second disk blade shaft 1
At 0, a second disk blade 5b and an elastic roller 6b that rotates integrally are rotatably supported by a shaft. The first disk blade 5a and the second disk blade 5b are arranged so as to intersect with each other, and both blade edges are pressed against each other by a coil spring 8. The elastic roller 6a is in contact with the upper surface of the paper passage surface 3a of the hollow rod 3, and the elastic roller 6b is in contact with the lower surface of the hollow rod 3 and is rotated by the movement of the moving body 4, respectively. The plate blade 5b is provided with a rotational force that bites into the sheet material. The moving body 4 shown in FIG.
A standby position detection switch 17 for detecting that the camera has returned to the standby position at the left end is attached.

The steady rest member 21 is a U-shaped member in which the steady rest bearings 21a and 21b at both ends bent at a right angle are connected by a connecting portion 21c. Steady rest bearing 21 at both ends
The interval between a and 21b is desirably about 1/2 of the moving length of the moving body 4 reciprocating. As shown in FIG. 3, one of the steady rest bearings 21 a and 21 b supports the substantially central portion of the shaft body 1 when the steady rest member 21 is located at the left and right start and end positions. Steady rest bearing 2
The outer shells 1a and 21b each have a rectangular shape that slides on the hollow cross section of the hollow rod 3, and have a bearing hole in which the shaft 1 slides at a position where the shaft 1 is inserted. The width of the connecting portion 21c is reduced, and is movably inserted into a groove provided in the lower portion 4b of the sliding portion 4a. The lower portion of the sliding portion 4a slides directly on the lower cross section of the hollow rod 3. Thereby, when the sliding portion 4a is located between the steady rest bearings 21a and 21b at both ends, the sliding portion 4a
Does not move, the sliding part 4a does not move.
When the end of the shaft rests on one of the steady rest bearings 21a, 21b, the steady rest member 21 moves in that direction.

In this embodiment, the connecting portion 21c is connected to the sliding portion 4
a, a space is provided between the corner of the inner section of the hollow rod 3 and the corner of the sliding portion 4a, and the connecting portion 21c is formed by the connecting rod inserted into this space. It may be configured. Further, as shown in FIG. 4, the width of the connecting portion 21c is widened and placed below the cross section of the hollow rod 3, so that the lower surface 4b of the sliding portion 4a of the moving body 4 is placed on the connecting portion 21c. You may. In this case, the sliding portion 4a rides on the connecting portion 21c and slides on the connecting portion 21c, or reciprocates by sliding in the hollow section of the hollow rod 3 together with the steady member 21. Further, in the present embodiment, the connecting portion 21c is placed below the hollow section of the hollow rod 3, but may be on the side surface, the upper surface, or the corner as described above.

The side plate 12 is fixed to the end face of the hollow rod 3, and its motor mounting portion 12a has a motor 14 serving as a rotation driving means.
Is attached. A gear 13 is fixed to a shaft end of the shaft body 1 on the side of the side plate 12, and meshes with a pinion gear 15 of a motor 14 to transmit a driving force to the shaft body 1.

With the above configuration, when the motor 14 drives the shaft 1 via the pinion gear 15 and the gear 13, the moving body guiding member 18 is engaged with the helical guide path 2 of the shaft 1, so that it moves. The body 4 is guided by the hollow cross section of the hollow rod 3 and moves in the leftward outward direction to start cutting. At this time the first
The disk blade 5a and the second disk blade 5b are rotationally driven by elastic rollers 6a and 6b, move while rotating in the direction of drawing in the sheet material to be cut, and move on the upper surface of the hollow rod 3 while not shown. The material is cut between the first disk blade 5a and the second disk blade 5b.

When the shaft body 1 rotates and the moving body 4 reaches the end in the forward direction, which is the left end in the figure, the cutting of the sheet material ends. Even if the cutting of the sheet material is completed, if the rotation of the shaft body 1 continues further, the moving body guiding member 18 rotates following the change in the curvature of the spiral guide path 2, and the spiral in the forward direction at the end of the forward direction. To the spiral guideway in the return direction,
In the backward direction, and stops when the moving body 4 reaches the end in the backward direction. This position detection is performed by the standby position detection switch 1
7.

Hereinafter, the operation of the steadying member 21 of the sheet material cutting apparatus of the present invention in the above cutting operation will be described. FIG. 3 is a diagram illustrating the operation of the steady rest member 21. 3A shows a state in which the moving body 4 is at a standby position at the start of cutting at the right end of the guide rail, and FIG. 3B shows a state in which the moving body 4 has moved to a position slightly closer to the end than the center of the outward path.
(C) is a diagram showing a state in which the moving body 4 has moved to the left end position at the end of cutting.

In the state where the moving body 4 in FIG. 3A is at the right end standby position, the steady rest member 21 has the steady rest bearing 21a on the right side of the shaft body 1 and the steady rest bearing 2 on the left side.
1b is in a state of supporting substantially the center of the shaft body 1.

The shaft body 1 rotates, the moving body 4 moves from the standby position in the leftward outward direction, and the cutting is started. At this time, the shaft body 1 is fixed to the steady rest bearing 2 on the left side of the steady rest member 21.
At 1b, it rotates with its substantially center pivotally supported. Therefore, in this state, the shaft 1 is mounted on the bearings 1 at both ends of the guide rail.
Since the shaft body 1 is supported at three points of the center and steady rest bearing 21b, even if the shaft body 1 has a small diameter and a long length, the rotational runout can be suppressed.

At first, even if the moving body 4 moves, the steady rest member 21 does not move and remains stationary.
The moving body 4 moves and the cutting proceeds while the shaft 1 supports the substantially central portion of the shaft body 1. When the moving body 4 further moves leftward and reaches near the middle of the outward path, and the left end of the moving body 4 contacts the steady rest bearing 21b on the left side of the steady rest member 21, FIG.
As shown in (b), the steady member 21 is moved to the left along with the movement of the moving body 4. In this state, the sliding portion 4a
The shaft body insertion hole rotates while supporting the vicinity of the central portion of the shaft body 1, so that there is no rotational vibration of the shaft body 1.

As shown in FIG. 3C, when the moving body 4 reaches the end of the forward path, which is the left end in the figure, the cutting of the sheet material is completed. At this time, the steady rest bearing 2 on the left side of the steady rest member 21.
1b is at the left end, and the right steady rest bearing 21a is the shaft 1
Will be in the state of supporting almost the center of. When the cutting of the sheet material is completed and the rotation of the shaft body 1 is further continued, the moving body guiding member 18 is engaged with the spiral guide path of the backward path, and the moving body 4 starts to move in the backward direction as described above. In this state, the shaft body 1 is supported by the right steady rest bearing 21a in the vicinity of the center, so that there is no rotational runout. The same operation is performed on the return path of the moving body as on the outward path.

As described above, according to the sheet material cutting apparatus of the embodiment of the present invention, when the moving body supporting the blade is moved by the helical shaft, the moving body is disposed so as to sandwich the front and rear in the reciprocating direction of the moving body. Since the vicinity of the central portion of the shaft is supported by the steady rest bearing of the steady rest member, rotational shake does not always occur in the shaft. The steady member is supported by the guide rail so as to be reciprocally movable. When the movable body moves and hits one of the steady rest bearings, the steady member moves together with the movable body, so that the movable body is positioned at the starting point of cutting. Even in the case where the length between both fulcrums of the shaft body near the end point is long, one of the steady rest bearings supports the vicinity of the central portion, thereby preventing rotational runout. As a result, if the length of the shaft body is long due to wide cutting, or if the diameter of the shaft body is small, rotational runout occurs near the center of the shaft body and noise is generated, so that stable cutting cannot be performed. The problem of the conventional cutting device is eliminated.

Further, in the sheet material cutting apparatus according to the embodiment of the present invention, the guide rail is formed into a shape having a hollow cross section,
Since the sliding part of the moving body provided with the helical shaft and the engaging part that engages with the shaft is arranged in the hollow cross section of the guide rail, the rotating part is not exposed, and it is small and safe. Moreover, it is easy to obtain a free-set structure that can be cut only by placing the sheet to be cut on the upper surface of the guide rail. Further, the steady rest member can be easily slidably disposed in the hollow cross section, and the above-mentioned effect can be obtained easily.

Further, since the anti-sway member is formed by a U-shaped member having anti-sway bearings at both ends as described above, it is simple and inexpensive. In addition, by forming the spiral guide path of the shaft body at least with the spiral of the reverse winding and the backward path continuous at one end thereof, the moving body is reciprocated only by rotating the shaft body in one direction. A reciprocating conversion mechanism is not required, and noise can be prevented. In addition, by providing the reciprocating path spiral in the shaft body, the strength of the shaft body can be reliably prevented from being reduced and rotational runout can be prevented. A quiet cutting device is obtained.

In the above embodiment, the sheet material cutting apparatus in which the moving body is provided with the two blades of the first disk blade and the second disk blade has been described, but one movable disk blade is provided in the moving body. Alternatively, the present invention can be applied to a sheet material cutting apparatus in which a knife-like blade is provided and these are slid and brought into contact with a linear fixed blade to cut.

[0032]

As described above, according to the sheet material cutting apparatus of the present invention, in the sheet material cutting apparatus for moving and moving the movable body supporting the blade by the helical shaft, the steady member during cutting is used. Since the vicinity of the center of the shaft is always supported, even if the length of the shaft is long as in a wide sheet material cutting device, the shaft can be stably cut without rotational vibration. This makes it possible to reduce the diameter of the shaft body, facilitate the use of a reciprocating spiral shaft body that reciprocates and drives the movable body in one direction, and reduce the size of the cutting device with a simple mechanism.

[Brief description of the drawings]

FIG. 1 is an assembly conceptual diagram showing an embodiment of a sheet material cutting apparatus according to the present invention.

FIG. 2 is a front view of the sheet material cutting apparatus of FIG.

FIG. 3 is a view showing the operation of the steady rest member of the sheet material cutting device of the present invention.

FIG. 4 is a view showing another example of the steadying member of the sheet material cutting device of the present invention.

[Explanation of symbols]

 Reference Signs List 1 shaft body 2 spiral guide path 3 hollow rod (guide rail) 3a end plate 3b paper passing surface 4 moving body 4a sliding portion 4b bottom surface 4c insertion hole 5a first disk blade 5b second disk blade 6a elastic roller 6b elasticity Roller 8 Coil spring 9 First disk blade shaft 10 Second disk blade shaft 11 Bearing 12 Side plate 13 Gear 14 Motor (drive means) 15 Pinion gear 16 Cover 17 Standby position detection switch 18 Moving member guiding member (engaging member) 18a Projection (engaging portion) 21 Steady member 21a Steady bearing 21b Steady bearing 21c Connecting portion

Claims (4)

[Claims] 1. A shaft body having a spiral guide path on its outer diameter is rotationally driven to move a moving body having an engaging portion that engages with the spiral guide path along a guide rail. In a sheet material cutting apparatus for cutting a sheet material by reciprocating a cutting blade supported by a body, a steady member in which a plurality of steady rest bearings for preventing rotational runout of the shaft body are connected at predetermined intervals. Wherein the steady rest member is disposed so that the plurality of steady rest bearings are spaced at predetermined intervals before and after in the reciprocating direction across the moving body, and is mounted on the guide rail so as to be reciprocally movable. A sheet material cutting device characterized by the above-mentioned. 2. The guide rail is made of a mold member having a hollow cross section extending in a reciprocating direction, the shaft body is disposed in the hollow cross section of the guide rail, and the moving body is provided with a hollow of the guide rail. A sliding portion that slides and moves on the inner surface of the cross section is provided on the sliding portion, and an engaging member that engages with the helical guide path is provided. 2. The sheet material cutting device according to claim 1, wherein the sheet material cutting device is disposed so as to be spaced a predetermined distance before and after in the reciprocating direction across the sliding portion, and is slidably mounted in the hollow section. 3. The sheet material cutting device according to claim 1, wherein the steady member is a U-shaped member provided with the steady bearing at both ends. 4. The forward spiral direction having at least one end continuous with each other so that the movable body is reciprocally driven by rotation of the shaft body in one direction. The sheet material cutting device according to any one of claims 1 to 4, wherein the sheet material cutting device is formed by a spiral and a spiral in a backward direction.