JP2000263491A - Sheet cutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect an abnormality in cutting and returning strokes to quickly stop a device by providing a sensor for detecting at least the access of a cutter support means to the terminal point of its going stroke on one position except both ends of the cutter support means. SOLUTION: A motor 10 having a pulley 3a connected to the output shaft end is fixed to the left end of a frame body 8, and a pulley 3b is rotatably supported on the right end. A wire 5 is suspended between both the pulleys, and both the ends are connected to a cutter support means 2, so that the cutter support means 2 is laterally driven by normally and reversely rotating the motor 10. A sensor actuating member 7 is movable in respective directions with projections 7b and 7c being contact with the cutter support means 2 in the final stage of the cutting stroke and returning stroke of the cutter support means 2. A sensor projection 7a actuates a sensor 6 fixed to the center of the frame body 8 by this movement, and this state is continued after overrun stoppage. When the sensor 6 is not actuated within a set time, occurrence of a trouble is judged to interrupt the current to the motor 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is mainly applied to a recording device such as a facsimile, a printer, a copying machine or the like, and is provided with a blade attached to a blade supporting means which reciprocates along a guide track. The present invention relates to a sheet cutting device for cutting a long sheet material.

[0002]

2. Description of the Related Art As a cutting device for cutting a long sheet material in a horizontal direction, various types are used in addition to a rotary type and a guillotine type, and a blade support that reciprocates along a guide track is used. There are also many sheet cutting devices in which a moving blade is attached to the means. Among them, there is a device that presses a circular moving blade such as a disk to a flat blade having a straight cutting edge, moves the blade, and cuts while rotating and moving the blade. An apparatus for cutting while rotating and rotating the circular blades by pressing the circular blades together, a cutting apparatus for cutting the knife-shaped moving blade by pressing and sliding the flat blade having a straight cutting edge, and a knife-shaped moving blade. There is a cutting device or the like that cuts into a groove by moving it.

FIG. 4 shows an example of a conventional sheet cutting apparatus having blade support means. The blade support means 2 uses the frame 8 as a guide track, and its drive is performed by a drive motor 10 arranged at one end of the cutting device. Blade support means 2
Pulleys 3a (motor drive) and 3b (idle) are arranged on both outer sides of the movement range of the carriage 2 (hereinafter also referred to as a carriage), and the wire 5 circulates between the pulleys. And the drive force of the motor 10 is transmitted. When the drive motor 10 is rotated forward and backward, the pulley 3
A driving force is transmitted to the carriage 2 via the wire 5a, 3b, and the disc blade 1 reciprocates in the longitudinal direction while rotating while being pressed against the flat blade 4a having a straight cutting edge, and a sheet not shown. Cut the material.

In the sheet cutting device having such a structure, a total of two switches 6 are provided as sensors for detecting the carriage at both ends of the starting point and the end point in the moving direction of the blade. The cutting device disclosed in Japanese Patent Application Laid-Open No. 4-330931 also has sensors for detection at both ends. The cutting device having this structure includes a drive motor 10
Is rotated forward to move the carriage 2 from the standby position to the end point side of the other end to cut the sheet, and at the end point side, the carriage 2 operates the switch 6 on the end point side to stop the drive motor 10; When the drive motor 10 is operated in reverse,
The carriage 2 moves from the end point side to the return side, and stops the drive motor 10 by operating the switch 6 on the return side (standby position side). On the other hand, Japanese Patent Application Laid-Open No. 8-99288 discloses a sheet cutting device in which a detection switch is provided at one end and a driving force is transmitted to a carriage by a flexible long material such as a wire.

Usually, in a sheet cutting apparatus, when a paper jam (paper jam) or the like occurs, it is necessary to stop the cutting apparatus and provide a mechanism capable of preventing damage to the entire apparatus, particularly to the motor. In such a cutting device, if the other sensor does not operate within a certain period of time after the drive motor starts, it is determined that an abnormality has occurred and the motor is shut off by cutting off the current, resulting in damage to the device and safety. The structure is such that the problem can be solved. In addition, 4-8968
No. 9 discloses that the above-described switch is omitted and the driving time of the motor as the driving means is set to a predetermined time, thereby applying a current in the normal rotation direction for a predetermined time to move the carriage. There is disclosed a sheet cutting apparatus in which the driving means is similarly rotated in reverse for a predetermined time to return to the original state, and is operated by controlling the time.

[0006]

An apparatus for detecting a carriage by the operation of sensors provided at both ends of the apparatus, such as the above-mentioned sheet cutting apparatus, includes a drive motor,
The work for connecting the sensor and the control unit to each other is very complicated, and the wires and the like also hinder the assembly, increasing the number of assembly steps and consequently the price of the apparatus.
Furthermore, in the case of a structure in which the carriage is driven by a wire, a space in the width direction is increased because pulleys are provided at both ends,
There is a limit in reducing the size or space. Also, in a device that controls the reciprocation of the blade only by time control, the carriage is stopped or congested due to some abnormality, for example, the occurrence of paper jam, while the drive motor is driven to rotate forward and the blade is moved from the standby position to the other end. In this case, the drive command of the motor is canceled when the time set in the control unit elapses even if the blade has not arrived at the other end, and then the drive motor is driven in reverse to move the blade to the standby position.
Then, if the blade is ready for the return operation, the blade returns to the standby position, and the drive command of the motor is released when the set time has elapsed. If the blade cannot return and move, the motor is kept stopped and the motor drive command is maintained until a set time has elapsed. If there is a cut command again without removing the cause of paper jam, etc., the carriage is repeatedly moved forward or stopped, and the motor is repeatedly commanded to rotate in the normal and reverse directions. Failures, paper jams, and the like continue, and damage such as damage to the motor may increase.

As described above, in order to perform reliable control in the cutter in which the blade supporting means reciprocates, after the sensor confirms that the blade supporting means has completed or almost completed the predetermined process without any abnormality, It is necessary to shift the control to the next step, such as stopping the motor and moving to the next step. In the above description, as the reciprocating drive method of the blade support means, the drive source is described as rotating forward and backward, but the present invention, for example, the left and right spirals on one or both ends on the same shaft body It is also possible to rotate the drive source in the same direction, such as smoothly connecting and engraving.In this case, after confirming with the sensor that one or both of the forward and backward strokes has been completed or almost completed, The control may be shifted to the next step. Hereinafter, the former will be mainly described. A sheet cutting device that reciprocates the blade supporting means also requires miniaturization. In particular, the ends of this type of device require a large amount of space, and consequently the entire device is likely to be bulky. That is, at the end of the device of this type, a space for mounting the device to the main device and a space for disposing components such as a motor, a speed reducer, a pulley, and a bearing without disturbing assembly and maintenance are required. . In addition to the above, the present inventors have paid attention to a disadvantage of disposing a sensor for confirming that the blade support means has completed or almost completed a predetermined process without abnormality at the end. . Therefore, in order to solve the above-mentioned disadvantages of the conventional cutting device, the present invention performs reliable control by detecting blade support means close to both ends of a reciprocating stroke, and arranges a sensor avoiding both ends. By doing so, it is possible to detect the presence or absence of an abnormality in the cutting and returning processes, to stop immediately in the case of an abnormality, to notify the abnormality, and to reduce the complicated work at the time of assembling the device. It is another object of the present invention to provide a sheet cutting apparatus that can reduce the size of a sheet and reduce the size of the sheet alone or in combination.

[0008]

SUMMARY OF THE INVENTION The present invention has been studied to eliminate the above-mentioned drawbacks of the conventional sheet cutting apparatus. As a result, the present invention relates to a sheet cutting apparatus having blade support means which reciprocates along a guide track. Even if the blade support means reaches any end, it is sufficient to confirm the presence with a sensor, and this sensor does not necessarily need to be installed at the end, and of the reciprocating motion range of the blade support means, The present invention has been made based on the finding that it may be provided at one place except for both ends. A specific example of confirming the existence of the blade supporting means close to each end by one sensor is a sensor operation in which the end is brought into contact with the blade supporting means to enable movement or change in posture. There is a method of using members together. However, the present invention is not limited to this, and a wire, a belt or the like provided with a projection or the like may be used. Then, it is confirmed by the operation of the sensor that the blade support means has approached the end portion, thereby stopping the motor which is the driving source,
The control is shifted to the next step, for example, the normal rotation and the reverse rotation are mutually converted.

That is, a first invention of the present application is a sheet cutting apparatus provided with a blade supporting means having a blade and reciprocating along a guide track, wherein the reciprocating drive of the blade supporting means is a normal / reverse rotation of a driving source. The sheet cutting device according to the second aspect of the present invention, wherein the blade supporting means is provided with a sensor for detecting at least an end point of the forward stroke at one position except both ends. The invention is
In the same sheet cutting apparatus, the forward and backward drive of the blade support means is based on the rotation of the drive source in the same direction, and the blade support means is provided with one or both of the forward and backward strokes. And a sensor for detecting the proximity of the end point of the sheet cutting device is provided at one position except for both ends.

In the present invention, the both ends are, as described above, a space for attaching the device to the main device,
It means the space for arranging parts that should be arranged at the ends, such as the motor, the speed reducer, the pulley, and the feed screw bearing, and the space occupied by the tool support means at both stroke ends. Since paper jams are mostly generated during the cutting process, it is desirable to confirm the reciprocation process with a sensor in the first invention of the present application. It can be omitted. In the first invention of the present application, the mechanism for reciprocating the blade support means rotates the drive source forward and backward, and a known mechanism such as a pulley method or a normal feed screw method can be adopted. According to the second invention of the present application, there is a feed screw engraved by connecting left and right spirals at one or both ends on the same shaft. Among the above, the feed screw type does not require a pulley, and thus has an advantage that the size of the apparatus in the reciprocating direction can be reduced. Also, the feed screw formed by connecting the left and right spirals at the ends on the same shaft body is particularly useful for overrun at the time of shifting from forward movement to return movement (the blade support means due to the inertia of the drive source). There is an advantage that there is no moving distance after a stop command) and there is little dead time.

In the present invention, the sensor is provided so as to avoid both ends, and the center is preferably the least troublesome in assembly with parts provided at both ends and maintenance and inspection. Further, in the present invention, as the blade attached to the blade supporting means, the various types described above can be applied.
Of these, the disk blade rotatably mounted on the blade support means has a smooth cut edge, and the portion in contact with the sheet material extends over the entire circumference of the disk blade, which is advantageous in terms of abrasion resistance. It is. It should be noted that cutting can be performed with only a single disk blade, but in order to cut more reliably and smoothly, cooperate with a counterpart material. The counterpart material has a simple flat blade and is easy to mount, but may be a disk blade. If a structure is adopted in which the disk blades are pressed against each other, a smoother cut edge can be obtained. The sensor according to the present invention is the simplest to use a mechanical method as the limit switch method, but the optical type,
Others such as magnetic type, capacitance type, etc. are also possible,
Also, the shape of each sensitive part may be determined according to the type of sensor, overrun, and the like. The signal output form of the sensor may be any as long as the output changes when the blade support means approaches a predetermined distance from the stroke end. Of these, O
It is desirable to change from N to OFF or from OFF to ON, and to change from ON to OFF at one end and from OFF to ON at the other end (or vice versa). In other words, it is desirable that the sensor keeps the same state despite the overrun of the carriage after the operation, since the control unit can be easily integrated. However, the present invention is not limited to this.
This method may be changed to N (or vice versa), and in this method, it may be necessary to store the fact that it has been turned on in the control unit, and the device may be slightly complicated.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, since the sensor is provided at one central portion, it is possible to suppress the end of the device from being complicated by parts, and to increase the size of the portion, and hence the overall size. This has the effect of preventing the operation of the apparatus, ensuring the reliability of the operation of the apparatus, and preventing the production from being complicated. Recently, the reciprocating speed of the blade supporting means has been increased, and accordingly, the overrun of the blade supporting means has been increasing despite the use of a braking device. In order to continue the state after the operation of the sensor by the blade supporting means itself as in the conventional device, it is necessary to attach a cam portion (protrusion for sensor) of an overrun or longer to the blade supporting means. It is necessary, and it is difficult to reduce the size of the blade support means and the like. In the case where a sensor operating member is interposed in the present invention, it is easy to form a cam portion having a length corresponding to the overrun or longer on the sensor side or the blade support means side in the sensor operating member.

In a typical example of the present invention, a time is set in the control unit so that the blade supporting means moves each stroke with a margin during normal operation. If the sensor starts operating within the set time after the motor starts to be driven, it is determined that there is no abnormality, and the control proceeds to the next step, such as waiting for the next cutting command. On the other hand, if the sensor does not operate within the set time, it is determined that a trouble has occurred for some reason, such as stoppage of the blade support means or traffic jam, and the control unit cuts off the motor drive current and issues an abnormality notification signal as necessary. Output to notify abnormal condition. The same applies to the time required for one reciprocation in the second invention. However, if a sensor for confirming an abnormality is provided at the end of the outward stroke, more reliable control can be achieved.
If the detection sensor does not operate within a predetermined time during the cutting process, the motor is rotated in the reverse direction to temporarily return to the standby position, the sensor is operated to detect that the sensor is at the standby position, and the program is started from there again. May be set, or it may be set so that it cannot be restarted. In this way, one or one set of sensors detects that there is no abnormality such as paper jam, stops the motor, and waits for a return stroke or a new cutting command, and returns control to the next step. It is a transition.

[0014]

Next, the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a perspective view of an example in which the present invention is applied to a reciprocating type sheet cutting device of a pulley / wire type blade supporting means. The frame body 8 has a groove-shaped cross section and a window-like opening 8a is provided in a web portion thereof, and the blade support means 2 is slidably mounted on the upper side of the opening as a guide rail. A motor 10 having a pulley 3a connected to an output shaft end is fixed to a left end of the frame 8, and a pulley 3b is rotatably supported at a right end. A wire 5 is stretched between the two pulleys, and both ends of the wire 5 are connected to the blade supporting means 2. By rotating the motor 10 forward and reverse, the blade supporting means 2 can be driven right and left. it can. A pair of upper and lower disk blades 1 and 4b are rotatably mounted on the blade support means 2 while pressing the circumferential blade edges against each other. The sheet material to be cut (not shown) has the height of the intersection of the pair of circumferential cutting edges,
a, and is cut by the rightward movement of the pair of disk blades 1 and 4b. On the upper flange surface of the frame body 8, the pins 8 b, 8 b guide the inner surface of the elongated hole to be movable in the left-right direction, and the sensor operating member 7 is provided with an appropriate frictional resistance to the movement. The sensor operating member 7 has its projections 7b and 7c connected to the blade support means 2 at the final stage of the cutting stroke (right stroke) and the return stroke (left stroke) of the blade support means 2 respectively. Abut,
It is possible to move in each direction, and by this movement, the sensor projection 7a activates the sensor 6 fixed to the central portion of the frame 8, and this state is maintained even after the overrun is stopped.

In a control unit (not shown), a set time is set for each stroke. If the sensor 6 does not operate within the set time, it is determined that a trouble has occurred for some reason and the motor 10 The current is cut off, and an abnormality notification signal is issued to notify the abnormality with a lamp or the like.
If the sensor 6 operates within the set time, the motor 10
In addition to interrupting the current to the motor and braking, the control is shifted to the next step, such as issuing a command for a return stroke and waiting for the next disconnection command. According to the present invention, it is possible to reduce the size of the blade supporting means by using one sensor substantially at the center and using the sensor operating member together. In this embodiment, the driving mechanism is used as a pulley-wire system, the price is reduced by using a limit switch as a sensor, and the sensor operating member 7 is used.
The present invention achieves simplification of the mounting mechanism as a device that slides and translates on a plane, and achieves higher safety by operating sensors in both reciprocating strokes. However, in the present invention, the attitude of the sensor operating member 7 may be changed, for example, the angle around the longitudinal axis is changed.

Next, another embodiment of the present invention will be described. FIG. 2 is a perspective view of a second embodiment of the present invention. A flat blade 4a having a straight cutting edge is fixed to the frame 8, and a drive shaft 9 engraved on the same axis so as to smoothly connect the left spiral groove and the right spiral groove at both ends is connected to the frame body 8 at both ends. The driving force is transmitted from the driving motor 10 via a gear at the left end while being rotatably supported by the driving motor 10. The blade support means (carriage) 2 is screwed into a spiral groove of the drive shaft 9 via a spiral follower (not shown), is slidably guided by the frame 8, and is mounted movably in the left-right direction. A disk blade 1 as a moving blade is rotatably supported on the carriage 2 and a peripheral edge thereof is pressed against the flat blade 4a. Switch 6 as a sensor
Is fixed to the frame 8 substantially at the center of the cutting device. FIG. 3 is a view in which the motor of FIG. 2 is removed. In this figure, the sensor operating member 7 has a projection 7a for operating the actuator of the sensor 6 at the center, a projection 7b that contacts the carriage 2,
7c at both ends, and can move in the left-right direction, and a moderate frictional resistance is given to this movement.

When the carriage 2 is in the standby position (position shown), the projection 7a of the sensor operating member (switch operating plate) 7 turns the switch 6 ON. When the motor 10 starts rotating according to a command from a control unit (not shown) and the carriage 2 moves to the other end (left side in the figure), and the disk blade 1 approaches the other end while cutting the sheet material, the carriage 2 is moved. The switch operating plate 7 is moved to the left by contacting the projection 7b of the switch operating plate 7. As a result, the projection 7a separates from the switch 6 at a preset position and turns it off. This confirms that most of the outbound journey has been completed successfully. Motor 10, and therefore drive shaft 9
Still continues to rotate, but the spiral on the shaft is connected at the shaft end from left to right (or vice versa), and the spiral follower follows this, so that the carriage 2 moves in the traveling direction. Changed automatically. When the carriage 2 moves to the original standby position side and approaches the extreme end of the stroke, the carriage 2 comes into contact with the projection 7c of the switch operating plate 7 and moves the switch operating plate 7 to the standby position side (right side). Move. As a result, the projection 7a is set to the switch 6 at the preset position.
Is turned on, the switch is turned on, and it is detected that the disk blade 1 has moved to the standby side and a normal cutting has been performed. Is stopped as much as possible to stop the round blade support member at the regular standby position.

In this embodiment, the pulley is ejected by using a drive shaft as a drive means, thereby reducing the size of the apparatus in the cutting direction, and keeping the drive system continuously rotating at the non-standby end to achieve overrun. No round-trip time
It has features such as ensuring the safety by confirming the reciprocating stroke with a sensor, and simplifying the control system by keeping the rotation direction of the drive source constant. However, instead of the drive shaft 9, a single screw can be used as a feed screw that rotates forward and backward, for example, a continuous spiral from the right spiral to the left spiral only at the non-standby side shaft end. By changing the pitch of the left and right spirals as the feed screw 9 in the above embodiment, quick return can be easily performed.

As described above, the present invention provides a cutting apparatus in which a blade reciprocates, in which a sensor for detecting blade support means is provided at a central portion and a member for operating the sensor for detecting the position is provided. By employing a structure in which the sensor is turned on and off, the complexity of wiring work at the time of assembly is reduced, and a reliable cutting operation can be performed by causing the sensor to detect the blade supporting means. Even if the blade causes a trouble for some reason, the control unit can quickly detect the occurrence of the abnormality, stop the operation, and output an abnormality signal to notify the abnormality, which is very effective. . In addition, the one that transmits the driving force to the carriage by the screw shaft is to minimize the total length dimension, which was a technical bottleneck of the sheet cutting device, in which the support member of this kind of blade moves left and right and cuts. Can be.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a sheet cutting apparatus according to the present invention.

FIG. 2 is a perspective view showing another embodiment of the sheet cutting apparatus of the present invention.

FIG. 3 is a perspective view showing a state where a motor of the embodiment of FIG. 2 is removed.

FIG. 4 is a perspective view showing an example of a conventional sheet material cutting apparatus.

[Explanation of symbols]

1 disk blade, 2 carriage, 3a, 3b pulley, 4
Mating material, 4a flat blade, 4b second disk blade, 5 long material (wire), 6 switch, 7 sensor operation plate, 7a,
7b, 7c protrusion, 8 frame, 8a window-like opening, 8b,
8c pin, 9 drive axes, 10 motors

Claims (5)

[Claims] 1. A sheet cutting apparatus comprising a blade supporting means having a blade and reciprocating along a guide track, the reciprocating drive of the blade supporting means is performed by forward / reverse rotation of a driving source, and the blade supporting means is provided. A sheet cutting apparatus, wherein a sensor for detecting that the means has approached at least the end point of the forward stroke is provided at one position except for both ends. 2. A sheet cutting apparatus comprising a blade supporting means having a blade and reciprocating along a guide track, wherein the forward and backward driving of the blade supporting means is performed by rotation of a driving source in the same direction. A sheet cutting device, wherein a sensor for detecting that the blade supporting means is close to one or both end points of the forward and backward strokes is provided at one position except for both end portions. 3. The sheet cutting device according to claim 1, wherein the sensor is provided at a central portion. 4. The sensor is operated by a movement or a change in posture of the sensor operating member, and the movement or the posture change is applied to the sensor operating member when the blade support means approaches an end point of the moving stroke. 4. The sheet cutting device according to claim 1, wherein the sheet cutting device is in contact with the sheet cutting device. 5. The method according to claim 1, wherein the control is shifted to the next normal step only when the sensor is activated within a set time.
2, 3 or 4 sheet cutting devices.