JP3010096B2 - Paper cutting device - Google Patents

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 operating a movable blade.

[0002]

2. Description of the Related Art In various processing systems for handling sheets such as forms, sheets are often cut by a sheet cutting device. For example, in a form processing system using continuous paper, continuous paper on which printing has been performed by a printer or the like is sent to a paper cutting device. It has been cut (double cut).

In a paper cutting device, a sheet carried into the paper cutting device is transported in a certain direction by a transport mechanism having a feed roller or the like. The transport mechanism stops and starts the transport of the paper. Control is performed so as to be repeated at a predetermined timing. At the same time, the movable blade of the cutting mechanism is controlled so as to repeatedly operate at a predetermined timing,
Paper cutting is performed.

[0004] A movable blade for cutting the paper is connected to a driving source via an interrupter in which an electromagnetic clutch and an electromagnetic brake are integrally assembled, and the interrupter is turned on / off by a control system. The movable blade is started or stopped. In one step of paper cutting, first, the electromagnetic brake of the interrupter is switched from the on state to the off state, and the electromagnetic clutch is switched from the off state to the on state with a delay of a predetermined time. As a result, the movable blade that has been stopped at the initial position starts to operate, and the paper is cut. On the other hand, immediately before the movable blade after the disconnection returns to the initial position, the electromagnetic clutch of the interrupter is switched from the on state to the off state, and the electromagnetic brake is switched from the off state to the on state after a predetermined time. As a result, the movable blade that has been in operation until then is stopped at the initial position.

At this time, the stopping operation of the movable blade is executed based on a detection signal from a sensor such as a photo interrupter. That is, when the movable blade after cutting reaches the scheduled position immediately before the stop, the sensor is turned on, a position detection signal of the movable blade is issued, and the braking start issued from the control system based on the movable blade position detection signal is started. The switching operation of the interrupter as described above is performed by the signal, and the movable blade is stopped. The stop position of the movable blade depends on the weight of the movable blade, the characteristics of the electromagnetic clutch and the electromagnetic brake, and the like. Therefore, the timing at which the braking start signal is output to the interrupter exactly matches the stop position of the movable blade with the initial setting position. So that they are individually adjusted.

[0006]

However, in general, in the paper cutting apparatus, the characteristics and the like of the electromagnetic clutch and the electromagnetic brake often change due to environmental changes and aging. For this reason, there may be a variation in the time from when the braking start signal is output to the interrupter until the movable blade actually stops, and as a result, the stop position of the movable blade may change. If the stop position of the movable blade fluctuates as described above, the conveyance of the sheet is obstructed by the movable blade, and the paper cannot be transported, or the cutting position is deviated.
Therefore, in the conventional apparatus, when the stop position of the movable blade fluctuates, it is necessary to manually adjust the control start timing of the interrupter each time.

Further, in the conventional apparatus, when an abnormality such as a foreign object being caught in the movable blade occurs, the movable blade cannot be stopped immediately even if the movable blade abnormality is detected. Only after it is stopped will it be in a stopped state. For this reason, conventionally, the movable blade may be greatly damaged.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a paper cutting apparatus capable of accurately controlling the operation of a movable blade, particularly, the stop control of the movable blade.

[0009]

In order to achieve the above object, a paper cutting apparatus according to the present invention outputs a braking start signal and an operation start signal to an interrupter in which an electromagnetic clutch and an electromagnetic brake are integrally assembled. In the paper cutting apparatus having a control system for stopping and operating the movable blade for paper cutting, the control system detects a rotation state of an output side portion of the interrupter, and determines an operating position of the movable blade. And a processing device that outputs a braking start signal to the interrupter at a timing obtained based on a detection signal issued from the blade position detecting means.

[0010]

In the paper cutting apparatus having such a configuration, the movement of the movable blade is constantly monitored by the blade position detecting means, and the control start timing for the interrupter is determined based on the detection signal from the blade position detecting means. Therefore, the stop control of the movable blade is always performed appropriately.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings. As shown in FIGS. 1 and 2, in the paper cutting apparatus according to the present invention, a transport path 1 constituting a transport mechanism is provided in the apparatus main body so as to extend substantially horizontally. A pair of feed rollers 2 and 2 are arranged so as to sandwich the transport path 1 from above and below. Of the pair of feed rollers 2, 2, the upper one in the figure is a driven roller, and the lower one in the figure is a drive roller, and the continuous form paper fed from the right side in the figure is , 2 and is fed to the right in the figure. A pulley 3 is provided on the axis of the driving roller 2,
A pulley 5 is provided on the output shaft of the drive motor 4 arranged slightly apart from the drive roller 2, and a timing belt 6 is stretched between the pulleys 3 and 5. Further, the drive motor 4 is provided with an encoder 7 for detecting a rotation state of the drive motor 4 and detecting a paper transport state by the feed rollers 2 and 2.

A movable blade 8 constituting a cutting mechanism is disposed downstream (left side in the drawing) of the pair of feed rollers 2 and 2 constituting the transport mechanism in the paper feeding direction. The movable blade 8 is guided and supported by a plurality of guides 9 in the upper portion of the transport path 1 so as to be able to reciprocate up and down in the figure. The fixed blade 10 to be performed is arranged at a lower portion of the transport path 1 in the figure.

One end of a link arm 11 is rotatably attached to the side of the movable blade 8 via a pin 12. It is rotatably attached to a pin 14 eccentrically provided on the rotating plate 13. That is, the movable blade 8 is configured to be moved up and down by the rotational drive of the rotary plate 13. Further, the drive shaft 15 of the rotating plate 13 is connected to the output side of the interrupter 16. This interrupter 16 is obtained by integrally assembling an electromagnetic clutch 16a and an electromagnetic brake 16b.
A timing belt 19 is stretched between an input side of the interrupter 16 and a pulley 18 attached to an output shaft of the drive motor 17. Drive motor 17
Is always in a rotationally driven state, and the operation of the movable blade 8 is started and stopped, that is, the cutting and starting of the paper is performed by turning on and off the interrupter 16.

On the output side of the interrupter 16, an encoder 21 for detecting the rotation state of the output side of the interrupter 16 and detecting the operating position of the movable blade 8 is mounted as blade position detecting means. Have been. This encoder 2
For 1, an absolute type is adopted.

The control system of such a paper cutting device is shown in FIG.
Has a configuration as shown in FIG. That is, the central processing unit (hereinafter, referred to as CPU) 31 has a RAM
A memory 32 composed of a ROM or the like is provided, and a paper transport state detection signal is applied to the CPU 31 from the encoder 7 of the transport mechanism. Start / stop command signal is output. In addition, the CPU 31 includes:
The movable blade position detection signal from the encoder 21 of the cutting mechanism is applied, and
, A command signal for starting / stopping the paper cutting is output.

A more specific configuration example of the control unit in this control system will be described with reference to FIGS. 4 (a) and 4 (b).
In one process of paper cutting, first, the movable blade 8
The continuous form paper is fed by a predetermined amount and set at the cutting position while being held immovably at the initial set position of the top dead center shown in FIG. Then, an operation start signal is issued from the CPU 31 to the interrupter 16, and as shown in FIG. 4B, the electromagnetic brake 16b is switched from the on state to the off state, and the residual torque is removed. The electromagnetic clutch 16a is switched from the off state to the on state with a delay of the fixed time c. As a result, the movable blade 8 that has been stopped at the top dead center, which is the initial position, starts operating toward the bottom dead center, and the paper is cut. The operating position of the movable blade 8 is determined by the encoder 21
Is constantly monitored by a detection signal (0 ° to 360 °) from the camera.

On the other hand, at timing A immediately before the movable blade 8 after cutting the paper returns to the top dead center which is the initial position, that is, when the movable blade 8 is at a position corresponding to 240 °, the CPU 31 A braking start signal is issued, and conversely, the electromagnetic clutch 16a is switched from the on state to the off state, and the electromagnetic brake 16b is switched from the off state to the on state with a delay of a predetermined set time c. As a result, the movable blade 8 that has been in the operating state is stopped. The stop position of the movable blade 8 differs depending on the weight of the movable blade, the characteristics of the electromagnetic clutch and the electromagnetic brake, and the like, and after a predetermined time d from the timing A when the braking start signal is issued to the interrupter 16 described above, The movable blade 8 is adjusted so as to be stopped at the initial setting position, that is, the reference position corresponding to 360 °.

However, at this time, the characteristics and the like of the electromagnetic clutch 16a and the electromagnetic brake 16b may change due to environmental changes and changes over time. In that case, the time d from the timing A at which the braking start signal is issued to the interrupter 16 to the actual stop of the movable blade 8 fluctuates, and the stop position of the movable blade 8 is shown in FIG. About to change as indicated by the broken line. However, in the present embodiment, the movement of the movable blade 8 is constantly monitored by the encoder 21, and a braking start signal is issued to the interrupter 16 at a timing obtained based on a detection signal from the encoder 21. Has become.

That is, as described above, when the time d from when the braking start signal is output to the interrupter 16 to when the movable blade 8 actually stops varies, the stop time d varies. The correction is performed by shifting the braking start signal output timing A to the interrupter 16 by the amount corresponding to the shift. Therefore, the movable blade 8 always performs appropriate stop control without greatly changing the stop position. A slight allowable range is set at the stop reference position of the movable blade 8 at this time. For example, within a range of ± 5 ° where no paper jam occurs, the movable blade 8 is treated as having stopped at the reference position.

When an abnormality such as a foreign object being caught in the movable blade 8 occurs, a braking start signal is transmitted from the CPU 31 to the interrupter 16 as shown by a dashed line in FIG. It is output immediately and the stop control of the movable blade 8 is executed as early as possible.

As described above, in this embodiment, the movement of the movable blade 8 is constantly monitored by the encoder 21, so that the braking start timing of the interrupter 16 is appropriately determined according to the situation at that time. As a result, the stop control of the movable blade 8 is always performed appropriately.

The blade position detecting means in the present invention is not limited to an encoder, but may be any means as long as it can constantly monitor the movement of the movable blade. For example, a linear sensor or the like in which minute sensor segments are arranged in the operating direction of the movable blade can be employed.

As the movable blade, various types such as a guillotine type as in this embodiment, a rotary cutter type and the like can be adopted. Further, the type of paper to be handled is not limited to continuous paper, and cut-sheet paper can be handled similarly.

[0024]

As described above, the control system of the paper cutting apparatus according to the present invention always detects the operating position of the movable blade by the blade position detecting means and based on the detection signal generated from the blade position detecting means. Since the start timing of the interrupter is appropriately determined according to the situation and the stop control of the movable blade is appropriately performed, the operation control of the movable blade, particularly the stop control of the movable blade, is accurately performed. And the reliability of the paper cutting device can be improved.

[Brief description of the drawings]

FIG. 1 is a schematic side view illustrating a transport mechanism and a cutting mechanism of a paper cutting apparatus to which the present invention is applied.

FIG. 2 is a schematic front explanatory view showing a cutting mechanism of the paper cutting device in FIG. 1;

FIG. 3 is a block diagram illustrating a configuration of a control system used in the sheet cutting apparatus in FIGS. 1 and 2;

FIG. 4 is a timing chart showing one embodiment of a control operation by a control system according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Conveyance path 4,17 Drive motor 7,21 Encoder (blade position detecting means) 8 Movable blade 16 Interrupter 31 CPU

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-63-108922 (JP, A) JP-A-4-69191 (JP, A) Fully open 1988-137825 (JP, U) Really open 1983 191996 (JP, U) Japanese Utility Model Showa 61-5593 (JP, U) Japanese Utility Model Utility Model Showa 63-47893 (JP, U)

Claims (1)

(57) [Claims] 1. A control system for stopping and operating a sheet cutting movable blade by outputting a braking start signal and an operation start signal to an interrupter in which an electromagnetic clutch and an electromagnetic brake are integrally assembled. In the paper cutting apparatus, the control system detects a rotation state of an output side portion of the interrupter, and constantly detects an operating position of the movable blade, and a detection emitted from the blade position detecting means. A processing device for outputting a braking start signal to the interrupter at a timing obtained based on the signal.