JPH08281592A - Sheet cutting device - Google Patents

Abstract

PURPOSE: To dispense with a limit switch or a control circuit for reversal, and restrain generation of abnormal sound from a cutting device, in a cutter moving device, by providing a guide passage in the cutting direction and a guide passage in the returning passage having helixes continuing in the vicinity of the terminal end in the cutting direction and being in relation of reverse winding to each other. CONSTITUTION: By transmitting torque from a power source 14 to a shaft body 1 through a gear 13, the shaft body 1 is rotated. Accompanying this rotation, force in the cutting direction is applied to a moving body induction member 18 built in a guide passage 2, and the moving body induction member 18 moves a moving body 4 in the cutting direction while sliding in the guide passage 2. At this time, by arranging a sheet material on the upper face of a hollow rod 3, the sheet material is cut off between the first disc cutting blade 6a and the second disc cutting blade 6b of the moving body 4. After completing this cutting, when the moving body 4 reaches the rear end in the cutting direction, the moving body induction member 18 is turned following to the change of curvature of the guide passage 2, helix in the cutting direction is changed to helix in the returning direction, and hence the moving body 4 is moved in the returning direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet cutting device for cutting a sheet-shaped object to be cut, and more particularly to an improvement of a cutting blade moving device.

[0002]

2. Description of the Related Art As a sheet cutting device mounted on a recording device such as a copying machine, a printer or a facsimile, there are two sheet cutting devices having a width corresponding to a cutting width as disclosed in Japanese Patent Publication No. 50-24466. There is a so-called rotary-type cutting device that uses a cutting tool to rotate one cutting tool to cross-contact the other cutting tool to cut the sheet material. Further, by using two blades having a width corresponding to the cutting width as described in Japanese Utility Model Publication No. 58-37594, one blade is moved up and down to press and slide with the other blade to form a sheet material. There is a so-called guillotine type sheet cutting device for cutting. These devices correspond to a cutting width of 2
Since two blades are used, there is an advantage that the sheet material can be quickly cut. Since these sheet material cutting devices need to drive a blade corresponding to the cutting width, there is a problem that a large cutting width drives a large-sized blade, which increases the load on the drive mechanism. Therefore, these sheet material cutting devices are disadvantageous for downsizing as a device for cutting a sheet material having a wide cutting width.

In contrast to the above-described sheet material cutting device, Japanese Utility Model Laid-Open No. 4-128195 or Japanese Utility Model Laid-Open No. 3-8868.
A blade having a width corresponding to the cutting width as described in Japanese Patent Publication No. 8 is moved by sliding a circular blade or a knife-edge-shaped blade while sliding under pressure, and a blade for cutting by this moving distance is cut. A movable sheet material cutting device has been proposed. This blade moving type sheet material cutting device is one in which the cutting blade itself moves, and since the size of the moving blade is small without being restricted by the cutting width, the load of the blade driving mechanism is the rotary type or the above. Compared with guillotine type blades, it is advantageous for downsizing of a device for cutting a wide sheet. Furthermore, JP-A-7-52085,
Japanese Unexamined Patent Publication No. 2-250793 or Japanese Utility Model Laid-Open No. 1-14
As described in Japanese Patent No. 9288, an assembly is formed by combining two circular blades so that they are in pressure contact with each other, and the assembly itself is moved so that the sheet material comes to the press contact portion of the blade, and the sheet material is moved. Another type of blade moving type sheet material cutting device for cutting a sheet has been proposed. This type of sheet cutting device that moves the assembly requires only two small circular blades as compared with the above-described blade moving type cutting device having a fixed blade, and the size and weight of the device can be further reduced. The advantage is that

[0004]

The blade moving type sheet material cutting device described above has a structure advantageous for downsizing of the sheet material cutting device. By the way, in this blade moving type sheet material cutting apparatus, a moving mechanism for moving the blade is naturally required. As a conventionally used moving mechanism, there is a structure in which a supporting member for a cutting tool to be moved is connected to a wire and the cutting tool is moved by moving the wire, as described in JP-A-7-52085. Are known. Further, as described in Japanese Patent Application Laid-Open No. 1-240295, there is also one that uses a belt having a rack-shaped blade type instead of the above-mentioned wire.

Further, a mechanism for sliding a blade supporting member on a screw-screw-shaped guide path as described in JP-A-3-88688 or JP-A-4-315594 to move in a direction in which the screw screw extends. Has also been adopted. Common to such a moving mechanism, it is necessary to move the blade in the cutting direction and then return it in the returning direction. In the conventional switching between the cutting direction and the returning direction, at the trailing end of the cutting, the movement is stopped by a limit switch or the like, and the driving mechanism such as a motor is reversely switched to perform the returning operation.

However, according to the study by the present inventor, when the movement of the cutting tool is stopped by the limit switch at the rear end in the cutting direction, the cutting tool moves at the end portion due to the inertia caused by the movement of the cutting tool in addition to the increase in the number of parts. Since it collides with a device or a brake mechanism to generate a collision noise, it is not preferable as a device requiring quietness. Further, switching the drive mechanism such as a motor at the trailing end of cutting requires an extra control circuit for reversing, which is a problem for a small-sized, low-cost cutting device. In view of the problems of the above-described blade moving type sheet material cutting device, an object of the present invention is to suppress the generation of abnormal noise from the cutting device by a mechanism that does not require a control circuit for a limit switch or reversal, It is an object of the present invention to provide a sheet cutting device that can be reduced in size and cost.

[0007]

DISCLOSURE OF THE INVENTION The inventor of the present invention has examined the simplification of the moving mechanism of the above-mentioned cutter movable type cutter, and has a spiral guide path which is in a reverse winding relationship with each other at the end in the cutting direction. It has been found that it is effective for a cutter of a blade moving type to adopt a mechanism for changing the direction from the cutting direction to the returning direction by continuous writing, so that the present invention has been reached. That is, the present invention is a sheet cutting apparatus provided with a blade moving device that reciprocates a cutting blade in a cutting direction and a returning direction, wherein the blade moving device is a spiral in a reverse winding relationship continuous near the end of the cutting direction. A sheet cutting device having a cutting direction guide path and a returning direction guide path, and capable of continuously moving a blade along the guiding path from the cutting direction to the returning direction.

As a preferable concrete moving device of the present invention, a shaft extending in the cutting direction and the returning direction, a spiral guide path formed on the surface of the shaft, and the shaft are rotationally driven. The drive means is provided, and a moving body that supports the blade and slides along the guide path by the rotation of the shaft body to reciprocate in the cutting direction and the returning direction is further provided. The guide path is composed of a spiral in the cutting direction that forms a guide path in the cutting direction and a spiral in the return direction that forms the guide path in the return direction, and the spiral in the cutting direction and the spiral in the return direction are in opposite winding relations. And the spiral in the cutting direction and the spiral in the return direction are continuous near the end of the cutting direction.

In the present invention, preferably, the spiral in the cutting direction and the spiral in the returning direction are continuous at the starting point and the ending point of the cutting direction, and by forming an endless guide path, the cutting is performed without changing the rotating direction of the shaft body. It is desirable to allow continuous turning in direction and return direction. Further, in the present invention, it is possible to change the moving speed of the blade by changing the pitch of the spiral. For example, by increasing the pitch of the spiral in the return direction relative to the pitch of the spiral in the cutting direction, the speed in the return direction with less load can be increased, and the cutting blade can be quickly returned to the first standby position, which is effective. Is.

Further, as shown in FIG. 1 of an embodiment to be described later, the shaft 1 described above is arranged so as to be enclosed in a hollow rod 3 having an opening extending in the same direction as the shaft 1. If the hollow rod and the moving body 4 slide to form a moving body guide in the cutting direction and the returning direction, the rotating portion is not exposed, which is advantageous for downsizing. Also,
The moving body 4 has a guideway contact surface longer than the width of the guideway, and the contact surface is slid with respect to the guideway to transmit the driving force in the cutting direction or the returning direction to the moving body. It is desirable to provide a moving body guiding member in order to prevent derailment from the guide path. The moving body guiding member slides on the guide path 2 as shown in FIG. 7, for example.

[0011]

As described above, the greatest feature of the present invention is that a cutting direction guide path and a returning direction guide path having spirals in a reverse winding relationship which are continuous with each other at the cutting direction end are formed. By moving the above-mentioned guide path so that the cutting tool can be continuously moved in the cutting direction and the returning direction. The guide path is formed by forming the above-mentioned spiral on the surface of a shaft body extending in the cutting direction and the returning direction as shown in FIG. 3, for example. If the shaft is rotated using a drive means such as a motor and the guide path and the moving body supporting the blade are slid, the rotational movement of the spiral is converted into a linear movement, and the blade can be moved. it can. At this time, first, the cutting direction is moved from the starting point to the ending point, and while moving toward the spiral side of the returning direction at the ending point of the cutting direction, it is moved like a single stroke in the returning direction as shown by the arrow in FIG. Will be things. That is, the present invention can move in the cutting direction and the returning direction only by rotating the shaft of the spiral in one direction, and a mechanism for switching the moving direction of the driving device between the cutting direction and the returning direction is not required, and the device Miniaturization can be achieved.

Further, this structure does not require a control device such as a limit switch, which is required at the rear end in the cutting direction in the sheet cutting device that cuts in only one direction. Furthermore, by using a continuous spiral as the guide path, it is possible to prevent generation of abnormal noise due to collision with a component such as a stopper due to the inertia of the blade at the rear end in the cutting direction, which has been a problem in the conventional sheet cutting apparatus. There is an advantage that you can. In order to prevent such abnormal noise from occurring, it is preferable that the continuous portion in the cutting direction and the returning direction be a smooth continuous curve. In the present invention, not only the groove-shaped spiral shown in FIG. 1 but also a projection-shaped spiral may be used.
However, in the projecting spiral, a gap is provided in the spiral portion at a portion where the spiral in the cutting direction intersects with the spiral in the return direction, for example, a gap is provided at a point where the railroad track intersects with the moving body. It is necessary to prevent interference with the protruding spiral.

In the present invention, the spiral in the cutting direction and the spiral in the returning direction are continuous at the starting point and the end point in the cutting direction,
By forming the endless guide path, it is possible to continuously change the cutting direction and the return direction without reversing the rotation direction of the shaft body by the driving means such as the motor. This eliminates the need for a control circuit for reversing the driving device, which enables further cost reduction. Further, since it is endless, it is possible to prevent abnormal noise from being generated due to collision with a stopper or the like due to the inertia of the blade when returning, which is preferable as a sheet cutting device used for OA equipment such as a facsimile machine, which requires quietness.

Further, in the present invention, it is possible to change the moving speed of the blade by changing the pitch of the spiral. In the sheet cutting device, for example, if the pitch of the spiral in the return direction is longer than the pitch of the spiral in the cutting direction, the speed in the return direction can be increased if the number of rotations of the shaft body is the same. When the blade is moved in the return direction without cutting, the load accompanying the movement in the return direction may be small, and it is desirable to make the pitch of the spiral wider in this way and perform the quick return.

Since the sheet cutting device is often used by being incorporated in an OA device such as a facsimile, not only is the device downsized, but the drive unit is not exposed as much as possible for safety, or It is necessary to simplify the shape of the device as much as possible and avoid interference with the device into which it is installed. In the present invention, the shaft body 1 as shown in FIG. 1 is arranged so as to be enclosed in the hollow rod 3,
It is arranged so as to be enclosed in a hollow rod 3 having an opening extending in the same direction as the shaft body, and the hollow rod and the moving body slide,
By forming the moving body guide in the cutting direction and the returning direction, the rotating part is not exposed, which is advantageous for downsizing, and the outer shape of the device is substantially hollow and the moving blade part is simple. Since it has a shape, it is possible to reduce interference with other devices when incorporated in a facsimile or the like. However, since the interference with the sheet cutting device of the present invention may not be a problem depending on the arrangement of other devices, the combination of the shaft body and the hollow rod in the present invention is not always an essential condition.

Further, in the present invention, since the spiral in the cutting direction and the spiral in the returning direction are provided so as to be wound in mutually opposite directions, there is an intersection portion of the spiral in the cutting direction and the spiral in the returning direction as shown in FIG. Will be things. When the moving body supporting the blade passes through this intersection, there is a possibility that it will deviate from the proper trajectory if the load is large. In order to move on the regular spiral guideway more reliably, the above-mentioned moving body has a guideway contact surface longer than the width of the guideway, and the contact surface is slid on the guideway. And transmits a driving force in the cutting direction or the returning direction to the moving body, for example, by providing a moving body guiding member 18 as shown in FIG. 7 of an embodiment described later, to prevent the moving body from deviating from the track at the above-mentioned intersection. Good to do.

If the movable body has a guideway contact surface longer than the width of the guideway, stable traveling is facilitated. Particularly, in the case of the groove-shaped guide path, the movable body cannot be supported at the intersection at the contact surface narrower than the width. In addition, since it is difficult to change the direction substantially at the end of the cutting direction with a contact surface having a length equal to or longer than half the circumference of the spiral, the contact surface is preferably shorter than the half circumference of the spiral. Further, in the present invention, since the spiral is inverted at the end of the cutting direction, the movable body guiding member is rotatably provided on the main body of the movable body so as to follow the change in the angle at the time of the reverse. Is desirable.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to embodiments and drawings. FIG. 1 is an assembly conceptual diagram showing an example of the sheet cutting apparatus of the present invention, and FIG. 2 is a front view of the sheet cutting apparatus based on FIG. 1 and 2, the shaft body 1
Is enclosed in the hollow rod 3 having a substantially U-shaped cross section, and the side plate 12
Is rotatably supported via a bearing 11 between
A gear 13 is fixed to the shaft 1 at an end of the shaft 1 on the side plate 12 side, and meshes with a pinion gear of a motor, which serves as a driving source 14 for rotation, and transmits a driving force. The moving body 4 is movably attached so as to slide between the outer peripheral surface of the shaft body 1 and the inner surface of the hollow rod 3. Further, a movable body guide member 18 for transmitting a driving force to the movable body 4 by sliding the contact surface with respect to the guide path is rotatably attached to the movable body 4. As shown in FIG. 7, the moving body guiding member has a contact surface longer than the width of the guide path 12, and can prevent the track from deviating from the track at the intersection of the guide paths.

The first disc blade 5a fixed to the first disc blade shaft 6a and the second disc blade 5b fixed to the second disc blade shaft 6b are arranged so as to intersect each other. . These are set screws 15 while being pressed against each other by the compression coil spring 8.
Is rotatably mounted by means of a first disc blade shaft bearing 9 and a first disc blade shaft bearing 10. Further, the elastic roller 7 fixed to the first disc blade shaft bearing 9 comes into contact with the upper surface of the hollow rod 3 in FIG. 1, and imparts a rotational force to the first disc blade 5a as the moving body 4 moves. Has become. Further, the position detecting switch 17 for detecting the completion of the return is attached to the side plate 12 as shown in FIG.

In the guide path 2 which constitutes the moving device which is a feature of the present invention, the spiral in the cutting direction and the spiral in the returning direction shown in FIG. 3 are formed by grooves formed on the surface of the shaft 1. It is formed by continuous curved grooves at the starting and ending points in the cutting direction. That is, the guide path 2 shown in FIGS. 1 to 3 is an endless guide path 2. The operation of the sheet cutting apparatus of the present invention will be described below with reference to FIG. First, the shaft 1 is rotated by transmitting a rotational force from the power source 14 to the shaft 1 via the gear 13. When the shaft 1 rotates, a force in the cutting direction is applied to the moving body guiding member fitted in the guide path 2, and the moving body guiding member 18 moves the moving body 4 in the cutting direction while sliding along the guide path 2. At this time, by disposing a sheet material (not shown) on the upper surface of the hollow rod 3, the sheet material can be cut between the first disc blade 5a and the second disc blade 5b.

In the present invention, as shown in FIG. 1, in order to guide the sheet material to the cutting position, it is desirable that the upper surface of the hollow rod 3 is a flat surface. At this time, the first disc blade 5a is rotated by the elastic roller 7 in the direction of pulling the sheet material. When the moving body 4 reaches the rear end in the cutting direction, which is the right end in FIG. 2, after the cutting of the sheet material, the moving body guiding member 2 rotates following the change in the curvature of the guide path to change the cutting direction. The spiral is switched to the spiral in the return direction.

Specifically, the movable body guiding member 18 which was oriented in the direction of arrow a shown in FIG. 3 is rotated at the terminal end in the direction of arrow b, then in the direction of arrow c, and further rotated. The arrow d faces in the returning direction. Then, a force in the returning direction is applied to the moving body guiding member 18 this time, and the moving body is moved in the returning direction. The moving body 4, which has reached the end point of the spiral in the returning direction, switches from the spiral in the returning direction to the spiral in the cutting direction, as in the case of reaching the end of the cutting direction, as shown by the arrow in FIG. At this time, the driving force is cut off by the position detection switch 17 that detects the standby position, the moving body stops at the standby position, and the cutting operation ends.

As described above, according to the sheet cutting apparatus of the present invention shown in FIGS. 1 and 2, the blade can be moved in the cutting direction and the returning direction only by rotating the drive source 14 in one direction. . Therefore, a control circuit for reversing the shaft 1 is unnecessary. Further, a limit switch at the end of the cutting direction is not required, and the sheet cutting device can be simplified and the cost can be reduced. Further, in the device shown in FIGS. 1 and 2, since the spiral is continuously inverted, it is possible to prevent the occurrence of a collision noise at the rear end in the cutting direction or the rear end in the returning direction, and the quietness is excellent. It becomes a thing.

Furthermore, as an additional action, even if the rotation direction of the drive source is wrong, the operation in the cutting direction and the returning direction is possible, and the accident that the motor polarity is mistaken and the motor is damaged by heating. Can be prevented. Further, as shown in FIG. 2, the sheet cutting portion of this sheet cutting device has a simple shape having the outer shape of the hollow rod 3, and it is sufficient to provide only the moving body 4 and the moving space of the blade installed therein. Will be things. As described above, the simple sheet cutting apparatus of the present invention can reduce interference with other components when incorporated in a facsimile or the like.

Next, another example of the blade moving device of the sheet cutting device of the present invention will be described. FIG. 4 shows a guide path 2 in which the spiral in the cutting direction and the spiral in the returning direction are continuous only at the end of the spiral in the cutting direction, and are not continuous at the first end in the cutting direction.
It is an example of a shaft body having. When the shaft body 1 is replaced with the shaft body 1 having the endless guide path as shown in FIGS. 1 to 3, the shaft body is reversely rotated in order to perform the next cutting operation after the completion of the returning operation. There is a need to. In the shaft body shown in FIG. 4, it is necessary to reverse the rotation of the shaft body 1 after the returning operation, and a control circuit is required. Therefore, the endless guide path shown in FIG. It is disadvantageous as compared with the case of using the shaft body having. But,
The edged shaft shown in FIG. 4 is advantageous in that it is easy to detect the exact stop position at the cutting start position. In addition, the device shown in FIG. 4 has an advantage that it can be stopped by a change in torque at the end of the return direction.

Further, FIG. 5 shows an example in which a guide path in which the spiral pitch in the return direction is larger than the pitch in the cutting direction shown in FIG. 3 is formed. If the pitch in the return direction is increased as shown in FIG. 5, the movement in the return direction with less load can be completed in a short time, and the cutting operation can be shortened. Further, in FIG. 6, the pitch between the first end and the terminal end in the cutting direction is smaller than that in the central portion in the cutting direction. With the configuration shown in FIG. 6, the moving speed at the initial stage of cutting and at the time of changing the direction from the cutting direction to the return direction becomes slow, so that the load applied to the shaft can be reduced. Further, reducing the pitch of the rear end in the cutting direction as shown in FIG. 6 is effective, for example, when it is necessary to secure a time until the cut sheet is removed.

The above-described blade moving device has shown the type in which the moving body 4 is combined with two disc blades, but the sheet cutting device of the present invention has the fixed blade 16 and the first blade as shown in FIG. It can also be used as a blade moving device of a sheet cutting device that cuts by combining the disc blades 5a.
The sheet cutting apparatus shown in FIG. 8 includes a guide shaft 19 for guiding the moving body 4, but a hollow rod having a hollow cross section shown in FIG. 1 may be used instead of the guide shaft 19.

[0028]

According to the present invention, it is possible to eliminate the conventional control circuit required for switching between the cutting direction and the return direction, which is essential in the sheet cutting apparatus, and reduce the number of parts. . Further, the present invention eliminates the need for a limit switch or the like required to stop the movement of the blade, and further eliminates collision noise due to inertia generated at the rear end of the cutting position, and OA equipment requiring quietness. Is useful as a sheet cutting device. In addition, if an endless guide path is provided, collision noise due to inertia can be eliminated even at the rear end in the return direction, and even if the shaft rotates in only one direction, the cutting direction and the return direction can be eliminated. Can be continuously changed, the number of parts can be further reduced, and the simplification and cost reduction of the sheet cutting device can be further promoted. In the present invention,
If the shaft body is enclosed in the hollow rod, the structure does not need to expose the rotating portion to the surface, which is safe and the sheet cutting device has a simple shape. Therefore, there is little interference with other parts when installed inside a facsimile or the like, and it is useful for downsizing of OA equipment itself such as a facsimile.

[Brief description of drawings]

FIG. 1 is an assembly conceptual diagram showing an example of a sheet cutting apparatus of the present invention.

FIG. 2 is a front view of an example of the sheet cutting apparatus of the present invention.

FIG. 3 is a diagram showing an example of an endless guide path of the present invention.

FIG. 4 is a diagram showing an example of a guide path in which the spiral is not continuous at the rear end in the return direction of the present invention.

FIG. 5 is a diagram showing an example of a guide path in which the pitch in the return direction of the present invention is made larger than the pitch in the cutting direction.

FIG. 6 is a diagram showing an example of a guide path in which the pitch of the first end and the rear end of the product is smaller than that in the center in the cutting direction.

FIG. 7 is a diagram showing an example of a relationship between a moving body guiding member and a guide path used in the present invention.

FIG. 8 is a perspective view showing another example of the sheet cutting apparatus of the present invention.

[Explanation of symbols]

1 shaft body, 2 guideways, 3, hollow rod, 4 moving body, 5
a first disc blade, 5b second disc blade, 6a first disc blade shaft, 6b second disc blade shaft, 7 elastic roller, 8 compression coil spring, 9 first disc blade bearing, 10 second circle Plate blade bearing, 1
DESCRIPTION OF SYMBOLS 1 bearing, 12 side plates, 13 gears, 14 drive system 15 mounting screws, 16 fixed blades, 17 position detection switch, 18 moving body guiding member, 19 guide shaft

Claims (6)

[Claims] 1. A sheet cutting apparatus comprising a blade moving device for reciprocating a cutting blade in a cutting direction and a returning direction, wherein the blade moving device is configured to continuously turn spirals in a reverse winding relationship near a terminal end of the cutting direction. A sheet cutting device comprising a guide path in the cutting direction and a guide path in the return direction, the blade being capable of continuously moving along the guide path from the cutting direction to the return direction. 2. A sheet cutting device comprising a blade moving device that reciprocates a cutting blade in a cutting direction and a returning direction, wherein the blade moving device includes a shaft body extended in the cutting direction and the returning direction, and the shaft. A spiral guide path formed on the surface of the body, a drive means for rotationally driving the shaft body, and a reciprocating in a cutting direction and a return direction by sliding the guide path by supporting the blade and rotating the shaft body. And a guideway formed on the shaft body, wherein the guide path formed on the shaft body is a cutting direction spiral forming a cutting direction guide path, and a return direction spiral forming a return direction guide path. The cutting-direction spiral and the returning-direction spiral have a reverse winding relationship with each other, and the cutting-direction spiral and the returning-direction spiral are continuous near the end of the cutting direction. Sheet cutting device. 3. The sheet cutting apparatus according to claim 1, wherein the spiral in the cutting direction and the spiral in the returning direction are continuous at a starting point and an ending point in the cutting direction to form an endless guide path. . 4. The spiral pitch in the return direction is larger than the pitch of the spiral in the cutting direction.
4. The sheet cutting device according to any one of 3 to 3. 5. The shaft body is encapsulated in a hollow rod having an opening extending in the same direction as the shaft body, and the hollow rod and the moving body slide to move in the cutting direction and the returning direction. The sheet cutting device according to claim 2, wherein the sheet cutting device forms a guide. 6. The moving body has a guideway contact surface longer than the width of the guideway, and the contact surface is slid with respect to the guideway to apply a driving force in the cutting direction or the returning direction to the moving body. The sheet cutting device according to claim 2, further comprising a moving body guiding member that transmits the sheet.