JP2001088090A - Cutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cutter with an increased cutting accuracy by precisely adjusting the pressing force of a sheet retaining plate. SOLUTION: A servo-motor 4 with a large drive torque provides a pressing force against a sheet put on a ruler 3 with a sheet retaining plate 2, and a servo-motor 5 with a small drive torque is used for soft clamping. When the servo-motor is driven, a rotating shaft 9 is rotated to raise a moving table 11 engaged through a groove with a feed screw 10 formed in the rotating shaft 9. By this, the sheet retaining plate 2 is withdrawn, uniformly at both ends, by a connection plate 19 connected to a swing arm 13 and a connection plate 20 connected to a swing arm 14, and comes in contact horizontally with the sheet put on the ruler 3. A motor 30 for driving a cutter blade is formed with a servo-motor, a normal motor, or a hydraulic motor.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting apparatus in which the pressing force of a sheet pressing plate is adjusted precisely and easily and the cutting accuracy of a sheet is improved.

[0002]

2. Description of the Related Art In a bookbinding process, a cutting apparatus is used which cuts one side or three sides of laminated paper and trims the end faces. FIG. 6 shows such a cutting apparatus 3.
It is a schematic front view which shows an example of 0.

In FIG. 5, a predetermined number of sheets P stacked on a table (mounting table) T are positioned and mounted. A cutting blade 31 is attached to the holder 32 and moves up and down in an oblique direction in the arrow X direction. 33 is a first connecting portion.
Reference numeral 34 denotes a first hydraulic mechanism for driving the cutting blade 31.

Reference numeral 35 denotes a clamp member (paper press plate) for pressing the paper P; 36, a second connecting portion; and 37, a second hydraulic mechanism for moving the clamp member 35 up and down in the Y direction. 38 is a first spring holding portion, 39 is a first chain, 40 is a first pulley, and 41 is a first connecting portion.

Reference numeral 42 denotes a second spring holding portion,
3 is a second chain, 44 is a second pulley, and 45 is a second connecting portion. When the second hydraulic mechanism 37 is operated, the clamp member 35 descends against the elastic holding of the first spring holding portion 38 and the second spring holding portion 42 and stops at the position where the paper P is pressed. When the operation of the second hydraulic mechanism 37 is stopped and the operating oil is discharged, the clamp member 35 is raised by the elasticity of the first spring holding portion 38 and the second spring holding portion 42 and returns to the home position.

In such a cutting apparatus, it is necessary to adjust the pressing force (pressing pressure) of the clamp member 35 in accordance with the material of the paper placed on the table T and the stacking height. For this reason, although not shown, the pressure of the second hydraulic mechanism 37 is adjusted by operating a pressure adjusting knob provided at a lower portion of the main body frame of the cutting apparatus.

[0007]

As described above, in the conventional cutting apparatus, when adjusting the pressing force of the clamp member (paper pressing plate), the cutting member is provided below the main body frame of the cutting apparatus. Operating the pressure adjustment knob
There is a problem that the accuracy of the pressure adjustment becomes coarse and the cutting accuracy is reduced, and there is a problem that the operation of the pressure adjustment is difficult to perform and the work load increases.

Further, the result of adjusting the set pressure has been judged on the display of the pressure gauge. Since such a pressure gauge is an analog display, there is a problem that the adjustment result of the set pressure cannot be minutely displayed, and it is not possible to accurately judge what kind of pressure it is.

Further, when the pressing force of the paper pressing plate against the paper is detected, it is necessary to install a load cell, which complicates the configuration, increases the installation space of the cutting device and increases the cost. There was a problem.

The present invention has been made in view of the foregoing problems, and has as its object to provide a cutting apparatus in which the pressing force of a sheet pressing plate is adjusted precisely and easily and the cutting accuracy of a sheet is improved.

[0011]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a cutting apparatus, comprising: a cutting device; a first driving means for driving a sheet pressing plate; and a second driving means for driving a cutting blade. Means, and a control device for driving the second drive means after the first drive means is driven, wherein the sheet positioned on the mounting table is pressed by the press plate and cut by the cutting blade. The apparatus is achieved by using a servomotor as the first driving means.

According to a second aspect of the present invention, in the cutting apparatus according to the first aspect, the pressing force of the sheet pressing plate is set by numerical input.

According to a third aspect of the present invention, in the cutting apparatus according to the first or second aspect, the first driving means includes a first servo motor having a large driving torque, and a driving means. A second servo motor having a small torque is provided, and the first servo motor and the second servo motor are switched and used according to the magnitude of the load.

According to a fourth aspect of the present invention, in the cutting apparatus according to any one of the first to third aspects, the rotational position of the servomotor is detected and compared with a target value.
A first feedback control system for performing position control based on the deviation signal; and a second feedback system for detecting the current value of the servomotor and comparing the detected current value with a target value, and performing torque control based on the deviation signal.
A feedback control system, and a switching means for switching from the first feedback control system to the second feedback control system when the detected current value is equal to or more than a predetermined value.

As described above, according to the first aspect of the present invention, the first driving means for driving the sheet pressing plate is provided with a support.
A vote motor is used. For this reason, the pressing force of the sheet pressing plate can be precisely adjusted, and the cutting accuracy of the sheet can be improved. Further, since the adjustment of the pressing force can be easily performed, the work load can be reduced.

According to the second aspect of the present invention, since the pressing force of the paper pressing plate is set by inputting a numerical value, the result of the pressure adjustment can be accurately determined.

According to a third aspect of the present invention, there is provided a first servo motor having a large driving torque and a second servo motor having a small driving torque. In particular, when a soft clamping process is required, a servomotor with a small driving torque can be operated to ensure safety.

Further, the invention according to claim 4 includes a first feedback control system for performing position control and a second feedback control system for performing torque control, and each feedback control system is provided in accordance with a current value. -The feedback control system is being switched. For this reason, it is possible to lower the sheet pressing plate by position control until the sheet presses the sheet, and to control the torque so as to obtain the set pressing force after the sheet presses the sheet. In addition,
By detecting the current value of the motor, the pressing force of the paper pressing plate can be detected.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a cutting apparatus according to the present invention will be described below with reference to the drawings. FIG. 1 is a schematic perspective view of the cutting apparatus. In FIG. 1, an operation panel 1b is provided on a front surface of a main body frame 1a of the cutting apparatus 1, and the operation panel 1b is provided with a display section 1c and a key input section 1d. The key input unit 1d inputs the pressing force of the paper pressing plate as a numerical value, and displays the numerical input on the display unit 1c.

Reference numeral 2 denotes a sheet press plate, and reference numeral 3 denotes a fixed tree fitted in a groove formed in the mounting table.
It is positioned and placed on the. When a cutting blade (not shown) cuts the sheet, the position of the fixed wood 3 becomes the position of the bottom dead center of the cutting blade.

Reference numeral 4 denotes a first servomotor having a large driving torque.
Reference numeral 5 is a second servo motor having a small driving torque. To cut a normal sheet, the first servomotor 4 is driven to apply a predetermined pressing force to the sheet pressing plate 2 to press the sheet placed on the fixed wood. Assuming that the rated output of the first servomotor 4 is 1.5 kW, the pressing force is about 2.5 tons.

However, when a small amount of thin paper is cut, it is necessary for the operator to move the paper holding plate 2 while holding the paper with one hand. This type of work is called a soft clamp, in which the pressing force of the paper pressing plate 2 is at most about 50 kg, and the pressing force at the rated output of the first servomotor 4 having a large driving torque. About 1/50.

It is difficult to control the torque of the first servomotor 4 having a large driving torque so as to obtain such a low pressing force. Therefore, during the operation of the soft clamp, the first servo motor 4 having a large driving torque is required.
Is switched to the second servomotor 5 having a small driving torque, and the paper pressing plate 2 is driven.

The first servomotor 4 and the second servomotor 4
The output shaft of the motor 5 is connected by a coupling,
The first pulley 6 is connected to one of these output shafts. Therefore, when power is supplied to one of the servomotors and driven, the output shaft of the other servomotor runs idle. Reference numeral 7 denotes a second pulley, and reference numeral 8 denotes a belt stretched between the first pulley 6 and the second pulley 7.

9 is a rotary shaft, 10 is a feed screw formed on the rotary shaft 9, 11 is a moving table, 12 is a holding plate, 13,
14 is a swing arm, 13a and 14a are fulcrum shafts of the swing arm, 15 and 16 are rollers supported by the swing arms 13 and 14, and 17 and 18 are swing arms. 13 and 14 fixed parts. A groove for engaging with the feed screw 10 is formed in the movable base 11, and an opening through which the feed screw 10 is inserted is provided in the holding plate 12.

The rotating shaft 9 is arranged near the center in the width direction of the sheet pressing plate 2, and the swing arms 13 and 14 have the same length. One end of each of the connecting plates 19 and 20 is a swing arm.
The other ends are fixed to the sheet pressing plate 2 by mounting portions 21 and 22, respectively, and the sheet pressing plate 2 and the swing arms 13 and 14 are connected. I do.

Numeral 30 denotes a motor for driving the cutting blade, which is not limited to a servomotor, but may be a motor having a normal configuration or a hydraulic motor. Reference numeral 31 denotes a pump connected to the output shaft of the motor 30.
, 32 is a pulley for power transmission, 33 is a pulley 31, 3
A belt stretched between the two, 34 is a nut, and 35 is a feed screw.

When the motor 30 is driven, pulleys 31, 3
2. The driving force of the motor 30 is transmitted by the power transmission system of the belt 33, the nut 34 rotates, and the feed screw 35 moves up and down. For this reason, when the feed screw 35 rises, the cutting blade attached to the tip of the feed screw 35 moves in the direction of the paper placed on the fixed wood, and cuts the paper.

By the way, in the cutting apparatus, in order to effectively perform the sheet cutting operation, the sheet holding plate 2 first descends on the sheet placed on the fixed wood to press the sheet. In this state, the cutting blade cuts a predetermined position of the sheet. Therefore, the servomotor 4 or 5 is driven first to lower the paper holding plate 2 to the paper position, and then the motor 30 is driven to lower the cutting blade to the paper position. In addition, the control device controls the operation of each drive source.

Next, the sheet pressing plate 2 of the cutting apparatus of the present invention
2 will be described with reference to the front views of FIGS.
FIG. 2 shows an initial state. In this state, when one of the servo motors, for example, the first servo motor 4 having a large driving torque is driven, the power transmission of the first pulley 6, the belt 8, and the second pulley 7 is performed. The driving force of the motor 30 is transmitted by the system, and the rotating shaft 9 rotates.

The rotation of the rotating shaft 9 causes the rotating shaft 9 to rotate.
The moving table 11 engaged with the feed screw 10 formed in the groove in the groove rises in the arrow X direction. At this time, the swing arm 1
The rollers 15 and 16 supported by the rollers 3 and 14 are held by the movable base 11 and the holding plate 12 and roll on the movable base 11,
One swing arm 13 rotates in the direction of arrow R with the fulcrum shaft 13a as a fulcrum. The other swing arm 14 rotates in the arrow S direction with the fulcrum shaft 14a as a fulcrum.

For this reason, the sheet pressing plate 2 is provided with a swing arm 1
3 and a swing arm 14
The two ends are evenly drawn by the connecting plate 20 connected to the sheet 3, and comes into horizontal contact with the sheet placed on the fixed wood 3.

FIG. 4 is a block diagram showing a feedback control system of the cutting apparatus according to the present invention. In FIG.
Is a feedback control system for controlling the position of the servomotor 40c. The target value Ra of the movement position of the sheet press plate 2 is input to the comparator 40a, and the rotation angle signal Rb (position signal of the rotation axis) of the servo motor 40c is fed back. The rotation angle signal Rb is obtained as an encoder (encoder) signal, and corresponds to a signal indicating the position of the sheet pressing plate 2 moved from the reference position.

The comparator 40a compares the target value Ra with the feedback signal Rb to form a deviation signal Rc. The deviation signal Rc is input to the proportional gain circuit 40b to form a speed command signal. The speed of the servo motor 40c is controlled by the speed command signal, and the position of the servo motor 40c is controlled by the feedback control system 40 until the rotation position signal Rb of the servo motor coincides with the target value Ra. Perform control.

Reference numeral 50 denotes a feedback control system for controlling the torque of the servomotor 40c. The target value Ia of the torque is input to the comparator 50a. Here, since the torque of servo motor 40c can be converted by the current value, target value Ia is inputted by the current value. The current value Ib of the servomotor 40c is detected, and the detected value is fed back to the comparator 50a. Comparator 5
0a, the target value Ia and the feedback current value I
b to generate a deviation signal Ic. The deviation signal Ic is input to the proportional gain circuit 50b to form a current command signal, and controls the servo motor 40c.

Reference numeral 60 denotes a controller which constantly detects the current value Ib of the servomotor 40c and outputs a control signal S according to the magnitude of the current value Ib. A switch 61 switches between the position control feedback control system 40 and the torque control feedback control system 50. The switch 61 is provided with contacts Ca and Cb whose on-off operations are opposite to each other.

The controller 60 turns on the contact Ca of the switch 61 while the current value Ib of the servomotor 40c is small.
A control signal S for turning off Cb is output. For this reason, the position control feedback control system 40 operates, and the servomotor 40c lowers the sheet presser plate 2.

When the paper holding plate 2 comes into contact with the paper and the current value Ib
Is greater than or equal to a certain value, the controller 60 outputs a control signal S for turning off the contact Ca of the switch 61 and turning on the contact Cb. Therefore, the position control feedback control system 40
The control is switched to the torque control feedback control system 50 to control the torque of the servomotor 40c. In addition,
Such switching from the position control feedback control system 40 to the torque control feedback control system 50 can be performed by software using a computer program.

As described above, in the present invention, the feedback control system 50 for controlling the torque is provided, so that the current target value of the servo motor is set to an arbitrary value, so that the paper pressing plate 2 can be controlled. The pressing force for pressing the sheet can be freely changed. Further, by detecting the current value of the servomotor, it is possible to determine the pressing force with which the sheet pressing plate 2 presses the sheet. In the above example, a servo motor is used as the second motor having a small driving torque, but other normal motors may be used.

[0040]

As described above, according to the first aspect of the present invention,
According to the invention, a servomotor is used as the first driving means for driving the sheet pressing plate. For this reason, the pressing force of the sheet pressing plate can be precisely adjusted, and the cutting accuracy can be improved. Further, since the adjustment of the pressing force can be easily performed, the work load can be reduced.

According to the second aspect of the present invention, since the pressing force of the paper pressing plate is set by inputting a numerical value, the result of the pressure adjustment can be finely determined.

According to a third aspect of the present invention, there is provided a first servo motor having a large driving torque and a second servo motor having a small driving torque. In particular, when a soft clamp is required, a servomotor with a small driving torque can be operated to ensure safety.

Further, the invention according to claim 4 is provided with a first feedback control system for performing position control and a second feedback control system for performing torque control, and each feedback is controlled in accordance with a current value. -The feedback control system is being switched. For this reason, it is possible to lower the sheet pressing plate by position control until the sheet presses the sheet, and to control the torque so as to obtain the set pressing force after the sheet presses the sheet. In addition,
By detecting the current value of the motor, the pressing force of the paper pressing plate can be detected.

[Brief description of the drawings]

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

FIG. 2 is a front view showing the operation of the holding plate of FIG. 1;

FIG. 3 is a front view showing the operation of the holding plate of FIG. 1;

FIG. 4 is a block diagram of a feedback control system.

FIG. 5 is a front view of a conventional cutting apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cutting device 1b Operation panel 1d Key input part 2 Paper press plate 3 Fixed wood 4 First servo motor with large driving torque 6 Second servo motor with small driving torque 9 Rotating shaft 10 Feed screw DESCRIPTION OF SYMBOLS 11 Moving table 13, 14 Swing arm 19, 20 Connecting plate 30 Motor for driving cutting blade

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masaru Nakajima 1601 Asahi Jinoshita, Asahi-machi, Takashima-gun, Shiga In-house Horizon International Co., Ltd. 1601 Asahi Jinoshita Horizon International Co., Ltd. In-house F-term (reference) 3C021 AA06 BB00 BE02 EA08

Claims (4)

[Claims] 1. A first driving unit for driving a sheet pressing plate, a second driving unit for driving a cutting blade, and a control device for driving the second driving unit after driving the first driving unit. A cutting device configured to press the sheet positioned on the mounting table with the pressing plate and cut the sheet with the cutting blade, wherein a servo motor is used as the first driving means. Cutting device. 2. The cutting apparatus according to claim 1, wherein the pressing force of the paper pressing plate is set by numerical input. 3. The first drive means includes a first servo motor having a large drive torque and a second motor having a small drive torque. 3. The cutting apparatus according to claim 1, wherein the second motor is switched and used according to the magnitude of the load. 4. A first control for detecting a rotational position of the servomotor, comparing the detected rotational position with a target value, and performing position control based on a deviation signal.
And a second feedback control system for detecting a current value of the servomotor, comparing the detected current value with a target value, and performing torque control based on a deviation signal. 4. A switching means for switching from the first feedback control system to the second feedback control system if is more than a predetermined value.
The cutting device according to any one of the above.