JPH09174485A - Sheet cutting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify a structure supporting a rolling element and efficiently rotate a rotary blade with the rolling element by moving and rotating the spherical rolling element in contact with a frame when a tool rest is moved, and rotating the rotary blade with the spherical rolling element. SOLUTION: This sheet cutting device uses a spherical rolling element 30 rotatably supported by a support section 31 provided on a tool rest 24 without being specified for the rotating direction, i.e., the spherical rolling element 30 having no shaft at both end sections, as a means rotating a rotary blade 27 via the movement of the tool rest 24. A shaft support section for supporting the shaft of the rolling element 30 is not required to be specially formed on the support section 31 for supporting the rolling element 30 provided on the tool rest 24. When the spherical rolling element 30 is moved together with the tool rest 24, the frictional resistance caused when a shaft is kept in contact with another part is not applied to the spherical rolling element 30. The spherical rolling element 30 is lightly rotated, and the rotary blade 27 can be efficiently rotated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet cutting apparatus for cutting a sheet by combining a rotary blade and a fixed blade.

[0002]

2. Description of the Related Art For example, in a heat-sensitive facsimile apparatus using roll-shaped recording paper, a sheet cutting device for cutting a recording paper in a width direction is provided. Conventionally, as this type of sheet cutting apparatus, there is one disclosed in Japanese Patent Laid-Open No. 5-200694.

6 and 7 show this conventional sheet cutting apparatus. That is, reference numeral 1 in the drawing denotes a support member movably provided on the frame 2 along the sheet cutting direction,
The support member 1 is screwed onto the feed screw 3. Reference numeral 4 denotes a disk-shaped rotary blade, and a shaft 5 provided on the rotary blade 4 is rotatably supported by the support member 1. Reference numeral 6 is a long fixed blade provided along the sheet cutting direction, which comes into contact with the rotary blade 4 to cut the sheet S. The rotary blade 4 is pressed from the outside by a spring 11 attached to the support member 1.

Reference numeral 7 denotes a roller-shaped rolling element, and shafts 8 located on the central axis are provided at both ends of the roller-shaped rolling element 7. The roller-shaped rolling elements 7 are arranged in grooves 9 formed in the support member 1 along the sheet cutting direction. The groove 9 extends on both sides in the sheet cutting direction with the shaft 5 of the rotary blade 4 as the center, and the rail-shaped guide 10 formed on the frame 2 with the bottom open is exposed. In addition, the groove 9 is formed with a shaft support portion 9a for mounting and supporting the shaft 8 of the roller-shaped rolling element 7 with the bottom portion sandwiched therebetween. The roller-like rolling element 7 is rotatably and movably supported by placing the shaft 8 on the shaft supporting portion 9a of the groove 9. In this state, the roller-like rolling element 7 contacts the guide 10 at the bottom of the groove 9. As it does, it contacts the back surface of the rotary blade 4.

That is, when the roller-shaped rolling element 7 moves with the movement of the support member 1, it comes into contact with the guide 10 and is rotated, and at the same time, it comes into contact with the rotary blade 4 to rotate the rotary blade 4.
In this case, the shaft 8 of the roller-shaped rolling element 7 is connected to the shaft support portion 9a of the groove 9.
Rotated supported on. In addition, the roller-shaped rolling elements 7 have grooves 9
When moving inside, the shaft 8 moves while rotating on the shaft support portion 9a of the groove 9. In addition, as shown in FIG. 6, the point Q where the roller-shaped rolling element 7 contacts the rotary blade 4 is fixed to the rotary blade 4 and the fixed blade 6.
It is assumed that it is located behind the center of gravity connecting the contact point P with the center of rotation O of the rotary blade 4 in the moving direction of the support member 1.

Then, the feed screw 3 is rotated by an electric motor (not shown) to move the support member 1 in the A direction or B direction in the figure. For example, when the support member 1 moves in the A direction, the roller-shaped rolling element 7 moves inside the groove 9 of the support member 1 to the end portion in the B direction, and at that position moves together with the support member 1 to guide the frame 2. The shaft support portion 9 of the groove 9
It rotates about an axis 8 supported on a. The rotation of the roller-shaped rolling elements 7 causes the rotary blade 5 to come into contact with the fixed blade 6 and rotate, cutting the sheet S passing between the rotary blade 4 and the fixed blade 6.

[0007]

The conventional sheet cutting apparatus thus constructed has the following problems. In the conventional sheet cutting apparatus, the rotary blade 4 is moved by the movement of the supporting member 1.
Roller-shaped rolling elements 7 having shafts 8 at both ends are used as means for rotating the roller. Therefore, it is necessary to specially form a shaft support portion 9a for supporting the shaft 8 in the groove 9 provided in the support member 1, and the configuration of the groove 9 which is a support portion for supporting the roller-shaped rolling element 7 is complicated. In addition, the processing cost becomes high.

In addition to the frictional resistance of the roller-shaped rolling element 7 itself when it comes into contact with parts such as the guide 10 when the support member 1 moves, the shaft support portion 9 of the groove 8 is provided by the shaft 8.
Since the frictional resistance that accompanies contact with a acts, the frictional resistance applied to the roller-shaped rolling elements 7 increases. For this reason,
When the support member 1 moves, the roller-shaped rolling element 7 with a shaft cannot rotate lightly, and the movement of the support member 1 causes the roller-shaped rolling element 7 to rotate and the rotary blade 4 to rotate efficiently. bad.

Further, the roller-shaped rolling element 7 having the shaft 8 can rotate only in one specific direction defined by the position where it is arranged. In FIG. 6, the roller-shaped rolling element 7 is easily rotated in accordance with the movement of the supporting member 1, and the sheet-cutting is performed by moving the roller-shaped rolling element 7 as the supporting member 1 is moved in both A and B directions. For this reason, the roller-shaped rolling element 7 is provided such that its shaft 8 is oriented in a direction perpendicular to the moving direction of the support member 1. However, the rotary blade 4 is provided so that the shaft 5 is perpendicular to the shaft 8. Therefore, the rotation direction of the roller-shaped rolling elements 7 is along the moving direction of the support member 1, and the rotary blade 4 cannot be efficiently rotated by utilizing the rotational force of the roller-shaped rolling elements 7.

Incidentally, as another conventional example, the actual fairness is 5-538.
There are sheet cutting devices disclosed in Japanese Patent Publication No. 90 and Japanese Utility Model Publication No. 6-15595.
Since a rolling element having a shaft is used as a means for rotating the rotary blade as in the case of 694, there are the same problems as those described above.

The present invention has been made in view of the above circumstances. By using a spherical rolling element having no shaft as means for rotating the rotary blade, the structure for supporting the rolling element is simplified and added to the rolling element. An object of the present invention is to provide a sheet cutting device that reduces frictional resistance to lighten the rotation of a rolling element due to movement of a tool rest, and can efficiently rotate a rotary blade by the rolling element.

[0012]

According to another aspect of the present invention, there is provided a sheet cutting device including a frame provided along a sheet cutting direction, and a tool rest movably provided on the frame along the sheet cutting direction. , A rotary blade that is rotatably provided on the tool rest and is moved together with the tool rest, a fixed blade that contacts the rotary blade to cut the sheet, and is rotated by contacting the frame when the tool rest is moved. A rolling element having a spherical shape that comes into contact with the rotary blade to rotate it, and a rolling element support portion that is provided on the tool post and rotatably supports the spherical rolling element without specifying the rotation direction,
And a moving mechanism for moving the tool rest.

According to this structure, when the tool rest moves,
The spherical rolling element moves and rotates while contacting the frame, and the spherical rolling element contacts the rotary blade that moves together with the tool rest, and rotates the rotary blade.

As means for rotating the rotary blade by moving the tool rest, spherical rolling members, that is, both end portions, are rotatably supported by the rolling member support portion provided on the tool rest without specifying the rotation direction. A spherical roller-shaped rolling element without a shaft is used. Therefore, it is not necessary to specially form a shaft support portion for supporting the shaft of the rolling element in the rolling element support portion provided on the tool post, and the structure of the supporting portion for supporting the rolling element is simplified and processed. Cost is reduced.

Further, when the spherical rolling element moves together with the tool rest, friction resistance due to the contact of the spherical rolling element shaft with other parts is not added to the spherical rolling element shaft. Therefore, the frictional resistance when the spherical rolling element rotates while moving is small, and the spherical rolling element can rotate lightly and rotate the rotary blade efficiently.

Further, the spherical rolling element has no shaft,
It is rotatably supported so that the direction of rotation is not specified. Therefore, when the tool rest moves, the spherical rolling element rotates along a direction inclined with respect to the moving direction of the tool rest in the rotation direction of the rotary blade. Therefore, the spherical rolling element can efficiently apply the rotational force to the rotary blade.

According to a second aspect of the invention, in the sheet cutting apparatus according to the first aspect, the rolling element support portion rotatably supports the spherical rolling element by point contact. According to this structure, the spherical rolling element is supported in the state in which the frictional resistance is smallest in the rolling element supporting portion of the tool rest due to the point contact, and the spherical rolling element can be rotated most lightly to efficiently apply the rotational force to the rotary blade. it can.

According to a third aspect of the present invention, in the sheet cutting apparatus according to the first or second aspect, the rolling element support portion is formed on the tool rest along the sheet cutting direction, and the rotation axis of the rotary blade is formed. It is characterized in that it has a groove shape extending on both sides in the sheet cutting direction with the sheet being sandwiched therebetween, and rotatably and movably supports the spherical rolling element.

According to this structure, when the tool rest moves in one direction or the other direction, the spherical rolling element moves to the end of the rolling member support portion of the tool rest opposite to the tool rest moving direction, The spherical rolling element comes into contact with the rotary blade at a position where the rotary blade comes into contact with the fixed blade at an inclination according to the moving direction of the rotary blade. As a result, when the tool rest moves in both the one direction and the other direction, the sheet is cut and the sheet can be cut efficiently.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIGS.

1 and 2 show the entire sheet cutting apparatus, and FIGS. 3 and 4 are enlarged views of the tool rest. The sheet cutting apparatus according to this embodiment is equipped to cut a recording sheet on which information is recorded in a width direction, for example, in a thermosensitive facsimile apparatus using a roll-shaped recording sheet (sheet). In addition, the sheet cutting device according to this embodiment performs cutting when the tool rest moves in one direction (A direction).

In FIGS. 1 to 4, reference numeral 21 denotes a frame, which has a length corresponding to at least the width dimension of the sheet S to be cut and is arranged horizontally along the width direction of the sheet S to be cut. ing. A sheet receiving portion 2 for receiving a sheet S to be cut on one side portion of the frame 21.
1a is formed along the length direction, and a tool rest receiving portion 21b and a rolling element guide surface 21c are formed below the portion 1a along the length direction. Each of these parts 21a-
21c has at least a length corresponding to the width dimension of the sheet S to be cut.

Reference numeral 22 denotes a fixed blade, which is horizontally long and has a length corresponding to the width dimension of the sheet S to be cut.
One side edge portion along the length direction is a blade portion 22a. The fixed blade 22 is oriented horizontally so that the blade portion 22a is located on one side of the frame 21, and is horizontally arranged above the sheet receiving portion 21a of the frame 21 with a predetermined space therebetween. 1 and FIG. 2, both ends are attached to the frame 21 by bolts 23.

As shown in FIGS. 2 and 3, the sheet S is conveyed along the direction C, which is perpendicular to the length direction of the frame 21, and passes between the fixed blade 22 and the sheet receiving portion 21a. To do.

24 is a tool rest, and this tool rest 24 has a projection 24a as shown in FIG. The tool rest 24 is arranged on one side of the frame 21, and the protrusion 24 a is slidably fitted and supported on the tool rest receiving portion 21 b of the frame 21. As a result, the tool rest 24 is provided on the frame 21 so as to be movable in the A direction and the B direction along the sheet cutting direction.

A frame 21 as shown in FIGS.
Is provided with a device for driving the tool rest 24. For example, 25 is a belt, and this belt 25 has pulleys 26A, 2A provided on both ends of the frame 21 in the longitudinal direction.
It is wound around 6B and both ends thereof are respectively connected to both ends of the tool rest 22 in the moving direction.
One pulley 26A is rotated by an electric motor (not shown) provided on the frame 21. Therefore, when the pulley 26A is rotated by the electric motor, a rotational force is applied to the belt 25,
Further, the other pulley 26B is rotated together with the belt 25. As a result, the belt 25 rotates and the tool rest 24 connected to the belt 25 moves along the length direction (horizontal direction) of the frame 21.

Reference numeral 27 is a rotary blade having a disk shape, and a blade portion 27a is formed on the entire periphery of the rotary blade. As shown in FIG. 4, a shaft 28 made of a round shaft is provided at the center of the rotary blade 27.
have. The rotary blade 27 is disposed on one side of the tool rest 24, and the shaft 28 is rotatably inserted and supported in a support hole 29 formed in the tool rest 24. The support hole 29 is a circular hole formed at a right angle to the lengthwise direction of the frame 21 and along the horizontal direction.
Has a larger hole diameter than the diameter of the shaft 28 to allow the rotary blade 27 to tilt and tilt into contact with the fixed blade 22. That is, the shaft 28 can be tilted inside the support hole 29 around the central axis of the support hole 29 over the entire circumferential direction.

As shown in FIGS. 3 to 4, 30 is a spherical rolling element, and this spherical rolling element 30 is formed of a true spherical body and has no shaft. The spherical rolling element 30 is rotatably fitted and supported by a rolling element support portion 31 formed on the tool rest 24, moves along with the movement of the tool rest 24, and comes into sliding contact with the rolling element guide surface 21c of the frame 21. While rotating, the rotary blade 27 is rotated by contacting the back surface of the rotary blade 27.

The spherical rolling element 30 is fitted and supported by the rolling element supporting portion 31 of the tool rest 24, so that it comes into contact with the back surface of the rotary blade 27 at point E, and the blade portion 24a of the tool rest 24 is fixed. The tool rest 24 so as to contact the blade portion 22a of 22 at the point F
Is placed in a position to tilt. That is, the spherical rolling element 30
Is a downstream side in the direction A in which the tool rest 24 moves with respect to the shaft 28 of the rotary blade 27 as shown in FIG.
It is located in the lower region with respect to the shaft 28 of No. 7 and contacts the back surface of the rotary blade 27 at point E.

For this reason, the rotary blade 27 has the spherical rolling element 30.
Contacting with each other at the above-described position causes the shaft 28 to be inclined in the state described below. That is, on the upstream side in the direction A in which the tool rest 24 moves relative to the shaft 28,
On the other hand, the blade portion 27a in the upper region is lowered, and the portion of the blade portion 27a is inclined so as to contact the blade portion 22a of the fixed blade 22. The rolling element support portion 31 of the tool rest 24 is formed at a position where the spherical rolling element 30 can be arranged in such a position.

The rolling element support portion 31 of the tool rest 24 is the tool rest 2
4 is a quadrangular concave portion opened on one side surface, and four side surfaces forming four sides of the quadrangle of the rolling element support portion 31 are formed on the spherical rolling element 30 fitted and supported by the rolling element support portion 31. Each is in point contact. Further, the bottom surface of the rolling element support portion 31 is opened and the rolling element guide surface 2 formed on the frame 21 is formed.
1c is exposed. The rolling element guide surface 21c is in point contact with the spherical rolling element 30 fitted and supported by the rolling element support portion 31. As a result, the spherical rolling element 30 moves to the rolling element support portion 3
The inner surface of the four sides of No. 1 and the rolling element guide surfaces 21c of the frame 21 exposed on the bottom are in point contact with each other and are rotatably supported without specifying the rotation direction. Spherical rolling element 3
The diameter of 0 is a size that protrudes from the rolling element support portion 31 and is in point contact with the back surface of the rotary blade 27 while being fitted and supported by the rolling element support portion 31.

Reference numeral 32 is a rotary blade retainer, which is formed of a metal leaf spring. As shown in FIGS. 3 and 4, the rotary blade retainer 32 is arranged outside the rotary blade 27, one end of which abuts on the central portion of the rotary blade 27 and the other end of which is fixed to the tool rest 24 by a bolt 33. Has been done. As a result, the rotary blade holder 32 presses the rotary blade 27 at one end against the tool rest 24 from the outside.

The rotary blade 27 pressed by the rotary blade holder 32
As shown in FIG. 3, the spherical rolling element 30 fitted and supported by the rolling element supporting portion 31 is in contact with the spherical rolling element 30 at a point E to be inclined, and the blade portion 2
7a contacts the blade portion 22a of the fixed blade 22 at the point F. That is, the rotary blade 27 is on the upstream side in the direction A in which the tool rest 24 moves with respect to the shaft 28 of the rotary blade 27, and
The blade portion 27a in the upper region with respect to the shaft 28 becomes lower and tilts so as to come into contact with the blade portion 22a of the fixed blade 22 at the point F. In this case, the shaft 28 of the rotary blade 27 is the hole 2 of the tool rest 24.
The tilting of the rotary blade 27 is made possible by tilting together with the rotary blade 27 inside 9.

The operation of the sheet cutting device thus configured will be described. First, the tool rest 24 is located at the right end of the frame 21 in FIGS. The sheet S is conveyed in the C direction shown in FIGS. 2 and 4, and passes between the sheet receiving portion 21 a of the frame 21 and the fixed blade 22. Therefore, the pulley 26A is driven by an electric motor (not shown).
By rotating the belt 25 by the operation of the belt 25 described above.
4 is moved along the length direction (horizontal direction) of the tool rest receiving portion 21b of the frame 21 in the direction A of FIGS. 1 to 3.

By the movement of the tool rest 24, the spherical rolling elements 30 move together while contacting the rolling element guide surfaces 21c of the frame 21. Therefore, the rolling element support portion 3 of the tool rest 24
The spherical rolling element 30 fitted to and supported by the first rolling element guide surface 2
It rotates due to friction with 1c. Further, the rotary blade 27 is given a rotational force by friction with the rotating spherical rolling element 30 and rotates about the shaft 28 in the direction of the arrow in the figure. The upper end of the rotating rotary blade 27 passes through the blade portion 22b of the fixed blade 22 along the length direction.

The rotary blade 27 has a tool rest 24 with respect to the shaft 28.
The blade portion 27a, which is located on the upstream side in the direction A in which A moves and is located above the shaft 28, is inclined so that the blade portion 27a contacts the fixed blade 22 at a point F. Due to the inclination of the rotary blade 27, the rotary blade 27 cuts the sheet S with a small shearing force. And the turret 24
Moves across the width of the sheet S
The whole width direction of is cut continuously.

Here, the above-mentioned sheet cutting device is rotatable as a means for rotating the rotary blade 27 by the movement of the tool rest 24 without the rotation direction being specified by the support portion 31 provided on the tool rest 24. Supported spherical rolling elements 3
1, that is, spherical rolling elements 30 having no shafts at both ends are used. For this reason, it is not necessary to specially form a shaft support portion for supporting the shaft of the rolling element 30 in the support portion 31 for supporting the rolling element provided on the tool rest 24, and the support portion 31 for supporting the rolling element can be formed. The structure is simplified and the processing cost is reduced.

Further, when the spherical rolling element 30 moves together with the tool rest 24, frictional resistance due to the contact of the shaft with other parts is not added to the spherical rolling element 30. Therefore, the frictional resistance when the spherical rolling element 30 rotates while moving is small, and the spherical rolling element 30 rotates lightly to rotate the rotary blade 2
7 can be rotated efficiently.

Further, the spherical rolling element 30 has no shaft and is rotatably supported so that the direction of rotation is not specified. Therefore, when the tool rest 24 moves, the spherical rolling element 30 rotates along a direction (arrow direction in FIG. 3) inclined with respect to the moving direction of the tool rest 24 in the transfer direction of the rotary blade 27. Therefore, in the spherical rolling element 27, the rotational force of the spherical rolling element 27 can efficiently act on the rotary blade 27.

Particularly, since the spherical rolling element 30 is rotatably supported by the point of contact with the support portion 31 provided on the tool rest 24, the spherical rolling element 30 is supported by the point contact with the least frictional resistance. ing. Therefore, the spherical rolling element 3
0 is the easiest to rotate and the rotational force can be efficiently applied to the rotary blade. The rolling element support portion 31 of the tool rest 24 is not limited to the shape shown in the drawing, and various shapes such as a cross shape can be adopted.

The second embodiment will be described with reference to FIG. This is an application example of the first embodiment,
5, the same parts as those in FIG. 3 are designated by the same reference numerals.

In this embodiment, the sheet S is cut by the rotary blade 27 even when the tool rest 24 is moved in the direction B shown in FIG.

A groove-shaped rolling element support portion 41 extending in the A-moving direction side and the B-direction side with the shaft 28 sandwiched therebetween is provided in a portion of one side portion of the tool rest 24 below the shaft 28 of the rotary blade 27. Has been formed. The groove-shaped rolling element support portion 41 includes the spherical rolling element 3
0 is movably and rotatably fitted and supported, and the inner surfaces on both sides extending in the lengthwise direction make point contact with the fitted and supported spherical rolling element 30. The bottom surface of the grooved rolling element support portion 41 is open as in the case of the first embodiment, and is in point contact with the rolling element guide surface 21c of the spherical rolling element 30 frame 21.

One end 41 of the groove-shaped rolling element support portion 41
a is located on the back surface of the rotary blade 27, in which the spherical rolling element 30 is located in the area in the direction B in which the tool rest 24 moves relative to the shaft 28 of the rotary blade 27 and below the shaft 28. It is a position where the point E contacts. The other end 41b of the groove-shaped rolling element support portion 41 has the spherical rolling element 30 on the A direction side where the tool rest 24 moves with respect to the shaft 28 of the rotary blade 27 and the shaft 2
8 is located in a lower region with respect to 8, and is in contact with the back surface of the rotary blade 27 at a point Ea.

When the tool rest 24 moves in the direction A shown in the drawing, the spherical rolling element 30 as shown by the solid line in the drawing.
Is located at one end 41a of the grooved rolling element support portion 41. Therefore, the rotary blade 27 is pushed by the spherical rolling element 30 and the shaft 2
The blade portion 27a, which is on the side of the A direction in which the tool rest 24 moves with respect to 8 and is located in the upper region with respect to the shaft 28, is inclined so as to be low, and the blade portion 27a is fixed at a point F. It contacts the blade portion 22b of the blade 22. The operation of cutting the sheet S in this case is the same as in the case of the first embodiment.

When the tool rest 24 moves in the direction B in the drawing, the spherical rolling element 30 moves and is positioned at the other end 41b of the groove-shaped rolling element supporting portion 41 as shown by the phantom line in the figure.
The rotary blade 27 is pushed by the spherical rolling element 30 so that the blade portion 27a at the position in the area on the B direction where the tool rest 24 moves with respect to the shaft 28 and above the shaft 28 is lowered. The blade 27a is inclined toward the fixed blade 22 at the point G.
It contacts the blade portion 22a. The operation of cutting the sheet S in this case is the same as in the case of the first embodiment.

According to this structure, in addition to the effects of the first embodiment described above, when the tool rest 24 moves in one direction or the other, the spherical rolling elements 30 cause the groove-shaped rolling of the tool rest 24 to move. The spherical rolling element 30 is moved to the end of the moving body supporting portion 41 opposite to the tool rest moving direction, and the rotary blade 27 contacts the fixed blade 22 at an inclination according to the moving direction.
Contacts the rotary blade 27. As a result, when the tool rest 24 moves in both the one direction and the other direction, the sheet S is cut and the sheet can be cut efficiently.

The present invention is not limited to the above-mentioned embodiments, but can be modified in various ways. For example, the solid blade is not limited to attaching a long one over the entire sheet cutting length to the frame 21 as in the above-described embodiment, but a short fixed blade is attached to the tool rest 24, and this fixed blade is attached to the tool rest. It may be moved together with. In the above-described embodiment, the fixed blade 22 is attached to the frame 2
1, the spherical rolling element 30 is provided on the upper side of the shaft 1 of the rotary blade 27.
Although it is provided on the lower side, the fixed blade 2 is not limited to this.
2 may be provided below the frame 21, and the spherical rolling element 30 may be provided above the shaft 28 of the rotary blade 27.

[0049]

According to the sheet cutting apparatus of the first aspect of the invention, as means for rotating the rotary blade by moving the tool rest, the support portion provided on the tool rest can rotate freely without specifying the rotation direction. A spherical rolling element supported by, that is, a spherical rolling element having no shaft at both ends is used. Therefore, it is not necessary to specially form a shaft supporting portion for supporting the shaft of the rolling element in the supporting portion for supporting the rolling element provided on the tool rest, and the structure of the supporting portion for supporting the rolling element is simplified. In addition, the processing cost is reduced.

Further, when the spherical rolling element moves together with the tool rest, friction resistance due to the contact of the shaft with other parts is not added to the spherical rolling element. Therefore, the frictional resistance when the spherical rolling element rotates while moving is small, and the spherical rolling element can rotate lightly and rotate the rotary blade efficiently.

Further, the spherical rolling element has no shaft,
It is rotatably supported so that the direction of rotation is not specified. Therefore, when the tool rest moves, the spherical rolling element rotates along a direction inclined to the moving direction of the tool rest in the transfer direction of the rotary blade. Therefore, the spherical rolling element efficiently causes the rotational force to act on the rotary blade.

According to the second aspect of the present invention, since the spherical rolling element is supported by the point contact in the state where the frictional resistance is the smallest, the spherical rolling element can be rotated most lightly and the rotational force can be efficiently applied to the rotary blade. it can.

According to the invention of claim 3, when the tool rest moves in one direction or the other direction, the spherical rolling element moves to the end of the support part of the tool rest on the side opposite to the tool rest movement direction. The spherical rolling element comes into contact with the rotary blade at a position where the rotary blade comes into contact with the fixed blade at an inclination according to the moving direction. This allows the turret to move both in one direction and the other,
Each sheet can be cut to efficiently cut the sheet.

[Brief description of the drawings]

FIG. 1 is a front view showing a sheet cutting apparatus according to a first embodiment of the invention of the present application.

FIG. 2 is a plan view showing the sheet cutting apparatus of the same embodiment.

FIG. 3 is a front view showing a tool rest in the sheet cutting apparatus according to the same embodiment.

FIG. 4 is a cross-sectional view taken along the line DD of FIG.

FIG. 5 is a front view showing a tool rest in the sheet cutting apparatus according to the second embodiment.

FIG. 6 is a front view showing a tool rest in a conventional sheet cutting apparatus.

FIG. 7 is a cross-sectional view showing a tool rest in the conventional sheet cutting apparatus.

[Explanation of symbols]

 21 ... Frame, 22 ... Fixed blade, 24 ... Turret, 25 ... Belt, 26A ... Pulley (moving device), 26B ... Pulley (moving device), 27 ... Rotating blade, 28 ... Shaft, 29 ... Support hole, 30 ... Spherical rolling element, 31 ... Spherical rolling element support portion 33 ... Pressing body.

Claims (3)

[Claims] 1. A frame provided along a sheet cutting direction, a tool rest movably provided on the frame along the sheet cutting direction, and a rotatably provided on the tool rest together with the tool rest. A rotating blade that is moved, a fixed blade that contacts the rotating blade to cut the sheet, and a spherical shape that rotates while contacting the rotating blade and rotating while contacting the frame when the tool rest moves. A rolling element support portion that is provided on the tool rest and that rotatably supports the spherical rolling element without specifying a rotation direction; and a moving mechanism that moves the tool rest. Sheet cutting device. 2. The sheet cutting device according to claim 1, wherein the rolling element support portion rotatably supports the spherical rolling element by point contact. 3. The rolling element support portion is formed in the tool rest along the sheet cutting direction and has a groove shape extending on both sides in the sheet cutting direction with the rotation axis of the rotary blade interposed therebetween, and the spherical shape. The sheet cutting device according to claim 1, wherein the rolling element is rotatably and movably supported.