JPH07195293A - Cutter unit for sheet - Google Patents

Abstract

PURPOSE:To make the preceding part of a peripheral cutting blade of a circular cutter convergently contact with a stationary blade irrespective of the shifting direction of a carriage by tilting the circular cutter to this carriage. CONSTITUTION:A round hole 38 and a long hole 40 are installed in a carriage 10, making these holes support both ends of a support shaft 30. A circular cutter 22 is clamped to this support shaft 30 via a sleeve 24, and a rubber roller 26 is attached to a large diametral part of this sleeve 24, using this roller as a friction roller. The carriage 10 is slidably fitted in a carriage guide frame 58, and the friction roller is frictionally contacted with this frame 58, and the circular cutter 22 is pressed to a stationary blade 42 by dint of a spring 28. When the carriage 10 is shifted, the support shaft 30 is tilted to some extent centering on the part supported by the round hole 38 by dint frictional force lying between the circular blade 22 and the stationary blade 42 as well as between the friction roller and the frame 58, whereby the circular cutter 22 is tilted to the carriage 10, so a preceding part of the peripheral cutting blade is convergently contacted with the stationary blade 42.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutter device for cutting a sheet, and more particularly to a cutter device for a sheet which shears a sheet in cooperation with a circular blade which moves while rotating and a fixed blade.

[0002]

2. Description of the Related Art A sheet cutter device of this type is known, for example, from Japanese Examined Patent Publication No. 63-59835 and Japanese Unexamined Patent Publication No. 3-10790. In these sheet cutter devices, a carriage is moved along a carriage guide by a carriage moving device, and a circular blade rotatably supported by the carriage around an axis substantially perpendicular to the carriage moving direction contacts a fixed blade. While rotating, it is configured to cut the sheet in cooperation with the fixed blade.

Since these sheet cutters cut the sheet by shearing between the circular blade and the fixed blade, in order to surely cut the sheet, the outer peripheral cutting blade of the circular blade and the straight cutting of the fixed blade are cut. It is required to make contact with the blade without any gap. In order to meet this requirement in spite of the existence of manufacturing error and the like, the rotation center line of the circular blade is inclined in a plane substantially parallel to the carriage movement direction and substantially perpendicular to the circular blade, and It is effective to incline the circular blade such that the leading side portion comes into contact with the fixed cutting edge and the trailing side portion moves away from the fixed blade during movement.

When the circular blade moves in one direction when cutting a sheet, the center line of rotation of the circular blade may be fixedly inclined, but the cutting is performed in both directions of the reciprocating movement of the circular blade. In the case of (1), it is necessary to change the direction of inclination of the rotation center line of the circular blade according to the moving direction of the circular blade. Therefore, the Japanese Patent Publication No. 63-598
In the sheet cutter device described in Japanese Patent No. 35, the carriage is divided into two members, a first member and a second member,
While the first member is guided by the carriage guide, the second member is rotatably connected to the first member by a rotation shaft,
A circular blade is rotatably attached to the second member. By the relative rotation of the second member with respect to the first member, the direction of inclination of the circular blade with respect to the fixed blade can be changed. In the sheet cutter device disclosed in Japanese Patent Laid-Open No. 3-10790, the carriage itself can be tilted by a small angle with respect to the carriage guide, so that the rotation center line of the circular blade supported by the carriage is The direction of inclination changes depending on the moving direction of the carriage and the circular blade.

[0005]

However, if the carriage is divided into a first member and a second member and connected so as to be rotatable relative to each other, the structure of the carriage is inevitably complicated and large. This problem can be solved by making the carriage itself tiltable with respect to the carriage guide, but in order to make the carriage tiltable with respect to the carriage guide, it is necessary to increase the fitting gap between the two. Another problem is that the carriage guiding function of the carriage guide is deteriorated and the movement of the carriage becomes unstable.
Against the background of the above circumstances, the invention of claim 1 avoids both the problem of the structure of the carriage becoming complicated and the size thereof and the problem of the deterioration of the guide function of the carriage guide, and the fixed blade of the circular blade. It is an object to make it possible to change the direction of the inclination with respect to the carriage movement direction.

According to the second aspect of the present invention, the support shaft can be tilted by utilizing the frictional force generated between the circular blade and the fixed blade as a result of the circular blade being pressed against the fixed blade by the biasing means. It was done as an issue. A third aspect of the present invention has an object to utilize a rotary drive device for rotationally driving a circular blade as a part of a support shaft tilting device for tilting a support shaft. The invention of claim 4 is
It is an object to simplify the structure of a carriage that supports a support shaft so as to be tiltable.

[0007]

In the sheet cutter device according to the invention of claim 1, in order to solve the above-mentioned problems, a circular blade is supported by a supporting shaft, and the supporting shaft is carried by a carriage and a carriage moving direction. A portion that is tiltably supported in a plane that is substantially parallel to and that is substantially perpendicular to the circular blade, and that the support shaft is located forward of the circular blade support shaft in the carriage movement direction based on the relative movement of the carriage with respect to the carriage guide. Includes a support shaft tilting device that tilts a portion located closer to the fixed blade and rearward of the support shaft in the carriage movement direction in a direction away from the fixed blade.

According to the second aspect of the present invention, the support shaft is substantially perpendicular to the circular blade by the carriage about the portion of the circular blade located on the side opposite to the fixed blade with respect to the fixed blade. The circular blade is rotatably supported in a plane, and the circular blade is axially biased toward the fixed blade by the biasing means, and the support shaft tilting mechanism is supported by the carriage and the biasing means. The device is configured.

According to the third aspect of the present invention, the support shaft is substantially perpendicular to the circular blade by the carriage about the portion of the circular blade located on the opposite side of the fixed blade from the fixed blade. The outer peripheral surface of a friction roller, which is rotatably supported in a plane and is concentrically and integrally rotatably fixed to the circular blade, is brought into frictional contact with the carriage guide. The circular blade rotation drive device is configured, and the support blade tilting device is configured by the circular blade rotation drive device and the support structure of the support shaft by the carriage.

According to another aspect of the present invention, the carriage has a round hole in a portion of the carriage located on the opposite side of the fixed blade from the fixed blade, and the portion having the round hole is opposite to the round blade. The portion located on the side has elongated holes extending substantially parallel to the carriage movement direction, and the support shaft is fitted in the round holes and the elongated holes.

[0011]

In the sheet cutter device according to the first aspect of the present invention, when the carriage is moved along the carriage guide, the support shaft is tilted by the support shaft tilting device based on the relative movement thereof, and as a result, the circular shape is obtained. A portion of the blade located forward of the support shaft in the carriage movement direction approaches the fixed blade, and a portion of the blade located rearward of the support shaft in the carriage movement direction is tilted in a direction away from the fixed blade. as a result,
A part of the outer peripheral cutting edge of the circular blade on the leading side in the carriage movement direction comes into intensive contact with the linear cutting edge of the fixed blade, and the sheet is satisfactorily cut. Since the support shaft is tilted based on the relative movement of the carriage with respect to the carriage guide, if the moving direction of the carriage is reversed, the tilt direction of the support shaft, that is, the tilt direction of the circular blade is also reversed.
During the forward and backward movements of the carriage, the leading edge of the outer peripheral cutting edge is brought into contact with the linear cutting edge of the fixed blade in a concentrated manner. Moreover, the support shaft and the circular blade only tilt with respect to the carriage, and the carriage itself does not need to be tiltable (rotatable) with respect to the carriage guide.

In the sheet cutter device according to the second aspect of the present invention, the circular blade is axially biased toward the fixed blade by the biasing means, and as a result, a gap is formed between the circular blade and the fixed blade. It is well prevented from occurring, the cutting function of the cutter device is enhanced, and a frictional force is generated between the circular blade and the fixed blade. The support shaft is supported by the carriage so as to be rotatable in a plane substantially perpendicular to the carriage movement direction and substantially perpendicular to the circular blade about a portion located on the side opposite to the fixed blade with respect to the circular blade. Therefore, the line of action of the frictional force does not match the line of action of the reaction force applied from the carriage to the support shaft, and a rotational moment is generated in the support shaft to tilt the support shaft. A portion located forward of the carriage movement direction approaches the fixed blade, and a portion located rearward of the support shaft in the carriage movement direction is tilted in a direction away from the fixed blade.

In the sheet cutter device according to the third aspect of the present invention, the friction roller is moved relative to the carriage as the carriage and the circular blade move in a state where the friction roller is frictionally engaged with the carriage guide. It is rotated by the frictional force of. Since the friction roller is fixed to the circular blade, the circular blade is rotated, but the frictional force is supported similarly to the frictional force between the circular blade and the fixed blade in the invention of claim 2. A rotary moment is generated on the shaft to tilt the circular blade with respect to the fixed blade.

In the invention of claim 4, one of the two portions of the support shaft that are separated in the axial direction is supported by the inner peripheral surface of the round hole, and the other is supported by the inner peripheral surface of the elongated hole. The elongated hole allows the support shaft to move in a direction substantially parallel to the carriage movement direction. On the other hand, the round hole does not allow substantial movement of the support shaft in the radial direction, but allows a small angle of inclination due to the gap between the support hole and the support shaft. Therefore, the support shaft can rotate at a small angle around the portion supported by the inner peripheral surface of the round hole.

[0015]

According to the invention of claim 1, the carriage itself can be tilted with respect to the carriage guide.
The circular blade can be tilted with respect to the fixed blade without dividing the carriage into two parts and connecting the two parts so as to be rotatable relative to each other. It is possible to solve the problem of complicated and large structure of. According to the invention of claim 2, the biasing means for improving the contact of the circular blade with the fixed blade can also function as a component of the support shaft tilting device, so that the structure of the sheet cutter device can be simplified. The effect is obtained.

According to the third aspect of the present invention, since the rotary drive device for rotationally driving the circular blade can function as a part of the support shaft tilting device for tilting the support shaft, the sheet cutter device is configured. The effect which can be made easy is acquired. Claim 4
According to the invention, it is only necessary to form the simple round hole and the elongated hole in the carriage, and the support shaft can be tilted (rotated) by the carriage having a simple structure.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A sheet cutter device as an embodiment common to the inventions of claims 1 to 4 will be described in detail below with reference to the drawings. In the sheet cutter device of FIGS. 1 to 3, 10 is a carriage, 12 is a frame, 14 is a motor as a driving device, and 16 is a coil member. Carriage 10
Is a bottomless box-shaped member that supports the circular blade 22, the sleeve 24, the rubber roller 26, the spring 28, the support shaft 30, and the washer 32, and is slidably fitted to the frame 12.

A cutting edge 34 is formed on the periphery of the circular edge 22,
A hole 36 is formed in the center. The sleeve 24 has a large diameter portion and a small diameter portion, and the large diameter portion has a rubber roller 26.
The circular blade 22 is fitted in the hole 36 at the small diameter portion and is caulked. Further, the support shaft 30 is press-fitted into the sleeve 24, and the rubber roller 26, the sleeve 24, the circular blade 22, and the support shaft 30 are integrated. One end of the support shaft 30 is inserted into a round hole 38 formed in the front wall of the carriage 10, and the other end is inserted into a long hole 40 formed in the rear wall. The long hole 40 extends in the horizontal direction and allows the support shaft 30 to rotate by a small angle in the horizontal plane around the portion fitted into the round hole 38.

A spring 28 and a washer 32 are provided in a portion of the support shaft 30 between the front wall of the carriage 10 and the circular blade 22.
Are fitted. The spring 28 urges the circular blade 22 to contact the fixed blade 42, and also supports the support shaft 30.
The carriage 10 is prevented from coming out of the elongated hole 40. Further, a gap is formed between the sleeve 24 and the rear wall of the carriage 10 so that the sleeve 24 does not get in the way when the support shaft 30 moves in the elongated hole 40.

Further, both side walls of the carriage 10 have a stepped shape in which the heights of the rear half portion and the front half portion are different, and the stepped portion is a shoulder 44. Dogs 48 and 49 project from the lower end of the front half of the side wall at right angles to the side wall, and these dogs 48 and 49 are left sensor 51 and right sensor 5 respectively.
The left moving end and the right moving end of the carriage 10 are detected by acting on the respective two detection end portions 53 and 54. Further, two bosses 56 are provided on the outer surface of the rear wall so as to project as shown in FIG. 4, and these bosses 56 serve as engaging portions that engage with the coil member 16 in a direction perpendicular to the longitudinal direction thereof. Has become.

The frame 12 has a longitudinal shape extending along the longitudinal direction of the coil member 16 and includes a carriage guide frame 58. Both ends of the lower surface of the carriage guide frame 58 in the longitudinal direction are the spacers 6, respectively.
0 and the mounting frame 62 via the fixed blade 42
Fixed to the carriage guide frame 58 and the fixed blade 4
A space for sending the sheet is formed between the sheet 2 and the sheet.
The left sensor 51 and the right sensor 52 are fixed to the left end and the right end of the mounting frame 62, respectively.
A side frame 64 is provided at one end of the carriage guide frame 58, and a motor mounting frame 66 is provided at the other end.
And a motor 14 are attached respectively. The fixed blade 42, the carriage guide frame 58, the mounting frame 62, the side frame 64, the motor mounting frame 66, etc. constitute the frame 12.

The carriage guide frame 58 is a member in which a circular groove 70 serving as a coil member supporting member is formed at the bottom of a rectangular groove 68 serving as a carriage guide. Square groove 68
The rear half of the carriage 10 is fitted in the carriage 10, and the engagement between the shoulder 44 and the engaging wall 72 hanging from the upper front end of the square groove 68 prevents the carriage 10 from being separated from the square groove 68. Further, the rubber roller 26 is in contact with the groove wall surface 76 on the lower side of the rectangular groove 68, and the carriage 1
When 0 moves, the rubber roller 26 is rotated by the frictional force between the rubber roller 26 and the groove wall surface 76, and the circular blade 2
2 is rotated.

The circular groove 70 covers the outer circumference of the coil member 16 more than half the circumference to substantially prevent the movement of the coil member in the radial direction.
The boss 56 is engaged in the longitudinal direction of the coil member 16 so as not to move relatively. One end of the coil member 16 is a free end, and the other end is concentrically fixed to a drive shaft 80 of the motor 14 via a holder 78. Since the winding direction of the coil member 16 is right, when the motor 14 rotates the coil member 16 clockwise, the carriage 10 is moved to the right, and when it is rotated counterclockwise, the carriage 10 is moved to the left. The motor 14, the coil member 16, the boss 56 and the like constitute a carriage moving device.

In the sheet cutter device configured as described above, the carriage guide frame 58 and the fixed blade 42 with the carriage 10 positioned at either the left or right end (here, the left end) in FIG. The sheet S is inserted into the gap formed between the fixed blade 42 and the carriage guide frame 58 by the spacer 60 from the wedge-shaped gap formed between the sheet S and the sheet, and is fed in the direction indicated by the arrow in FIGS. After the sheet S protrudes from the tip of the fixed blade 42 by an appropriate length, the feeding is stopped.

Next, the motor 14 rotates the coil member 16 in the clockwise direction, whereby the carriage 10 is moved to the right and the circular blade 22 is rotated.
The sheet S is cut by the cutting blade 34 and the tip of the fixed blade 42. After the cutting of the sheet S is completed, the dog 4 of the carriage 10
When 9 and the detection end 54 of the right sensor 52 come into contact with each other, it is detected that the carriage 10 has reached the right end, the driving of the motor 14 is stopped, and the carriage 10 is stopped at the right end position. Next, when the sheet S reaches the position to be cut, the motor 14 rotates the coil member 16 counterclockwise, and the carriage 10 is moved to the left.

When the carriage 10 moves as described above, the support shaft 30 is rotated by a small angle along the elongated hole 40 by the frictional force between the circular blade 22 and the rubber roller 26 with the frame 12, and is fitted therein. The circular blade 22 is tilted at a small angle with respect to the fixed blade 42. That is, the leading side of the circular blade 22 and the fixed blade 42 are in close contact with each other, and the trailing side and the fixed blade 42 are separated from each other, whereby the sheet S is satisfactorily cut.

As is apparent from the above description, in the present embodiment, the spring 28 functions as a biasing means for biasing the circular blade 22 toward the fixed blade 42 in the axial direction, and the biasing force of the spring 28 is applied. Based on the frictional force between the circular blade 22 and the fixed blade 42, the support shaft 30 is rotated around the portion fitted into the round hole 39. A spring 28 as a biasing means is provided with a round hole 38 of the carriage 10.
The support shaft tilting device is configured in cooperation with the support structure of the support shaft 30 by the elongated holes 40 and. Further, a friction roller formed by fitting a rubber roller 26 to the large diameter portion of the sleeve 24 is fixed to the circular blade 22, and the friction roller is brought into frictional contact with a carriage guide frame 58 as a carriage guide. By this, the relative movement between the carriage 10 and the carriage guide frame 58 is converted into the rotational movement of the circular blade 22. The friction roller and the carriage guide frame 58 form a circular blade rotation drive device. Further, the frictional force between the friction roller and the carriage guide frame 58 tilts the support shaft 30 for the same reason as the frictional force between the circular blade 22 and the fixed blade 42. In this sense, the circular blade rotation driving device is used as the circular hole 3 of the carriage 10.
It may be considered that the support shaft tilting device is configured in cooperation with the support structure of the support shaft 30 by the eight and the elongated hole 40.

In the present embodiment, since the carriage 10 is moved by rotating the coil member 16, the number of parts can be reduced and the structure can be simplified. Further, in order to increase the moving speed of the carriage 10, the pitch of the coil members 16 is made larger than that of a normal coil spring. Motor 14 by increasing the pitch
Since the moving speed of the carriage 10 can be increased without increasing the number of rotations of 1, the inexpensive motor can be used. Further, in order to increase the rigidity of the coil member 16, the ratio of the average winding diameter D to the wire diameter d was made smaller than that of a normal coil spring, and the wire used had excellent strength and hardness. By reducing the average winding diameter D, the bending rigidity and the torsional rigidity of the coil member 16 can be increased.

Since the coil member 16 is fitted in the circular groove 70 and rotated in the circular groove 70, the bending deformation of the coil member 16 is less likely to occur and the coil member 16 and the carriage 10 are engaged with each other. It became hard to come off.

The coil member supporting member does not necessarily have to have a circular groove shape, but may have a polygonal groove shape. Any shape may be used as long as it allows rotation of the coil member while substantially preventing movement in the radial direction, and may have a shape capable of contacting at least three portions of the coil member over a half circumference.

The number of bosses on the carriage is not limited to two, but may be one or three or more. Since the engaging portion of the carriage may have a shape capable of engaging the coil member relatively immovably in the longitudinal direction of the coil member and allowing the coil spring to rotate, it is not limited to the illustrated boss, As shown in FIG. 5, it is also possible to use an ear piece 86 or the like having a through hole 84 that allows passage of the coil member winding.

Although not illustrated, the present invention can be carried out in variously modified and modified forms based on the knowledge of those skilled in the art without departing from the scope of the claims.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a sheet cutter device according to an embodiment of the present invention.

FIG. 2 is a front view (partially sectional view) of the above embodiment.

FIG. 3 is an enlarged view of an AA cross section of the above embodiment.

FIG. 4 is a rear perspective view of the carriage used in the above embodiment.

FIG. 5 is a plan sectional view showing a part of another embodiment of the present invention.

[Explanation of symbols]

 10 Carriage 12 Frame 22 Circular Blade 24 Sleeve 26 Rubber Roller 28 Spring 30 Support Shaft 38 Round Hole 40 Long Hole 42 Fixed Blade 58 Carriage Guide Frame

Claims (4)

[Claims] 1. A carriage is moved along a carriage guide by a carriage moving device, and a circular blade rotatably supported by the carriage about an axis substantially perpendicular to the carriage moving direction is rotated while being in contact with a fixed blade. Then
In a sheet cutter device for cutting a sheet in cooperation with a fixed blade, the circular blade is supported by a supporting shaft, and the supporting shaft is a plane substantially parallel to the carriage and substantially perpendicular to the carriage moving direction. Is supported so as to be tiltable therein, and a portion of the support shaft located forward of the support shaft of the circular blade in the carriage movement direction approaches the fixed blade based on relative movement of the carriage with respect to the carriage guide, A sheet cutter device, comprising: a support shaft tilting device that tilts a portion located behind the shaft in the carriage movement direction in a direction away from the fixed blade. 2. The support shaft is provided by the carriage,
The circular blade is rotatably supported in a plane substantially perpendicular to the carriage moving direction about a portion located on the opposite side of the fixed blade from the fixed blade, and the circular shape. The blade is axially biased toward the fixed blade by a biasing means, and the support shaft tilting device is constituted by the support structure of the support shaft by the carriage and the biasing means. The sheet cutter device according to claim 1. 3. The support shaft is provided by the carriage.
The circular blade is rotatably supported in a plane substantially perpendicular to the carriage moving direction about a portion located on the opposite side of the fixed blade from the fixed blade, and the circular shape. An outer peripheral surface of a friction roller concentrically and integrally rotatably fixed to the blade is brought into frictional contact with the carriage guide, and the carriage guide and the friction roller form a circular blade rotation drive device. The sheet cutter device according to claim 1, wherein the support shaft tilting device is configured by a circular blade rotation drive device and a support structure for supporting the support shaft by the carriage. 4. The carriage has a round hole in a portion located on the opposite side of the circular blade from the fixed blade, and is located on the opposite side of the circular blade from the portion having the round hole. The sheet cutter according to claim 2 or 3, characterized in that an elongated hole extending substantially parallel to the carriage movement direction is provided in a portion to be formed, and the support shaft is fitted into the round hole and the elongated hole. apparatus.