JP2008296352A - Cutting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cutting device reducing the time required for one cycle of cutting and driving a cutter blade while a material to be cut is securely pressed by a pressing member. <P>SOLUTION: In the cutting device provided with: the pressing member that reciprocates vertically; and the cutter blade that also reciprocates vertically, the material to be cut is positioned on a table, pressed by the descent of the pressing member, and cut by the descent of the cutter blade. The drive of the pressing member is performed by a motor 6, and an electric current detector 14 is provided to detect an electric current flowing to the motor 6. A cutting control device 11 acquires a detected current value from the electric current detector 14 when the pressing member descends, compares a torque value based on the acquired detected electric current value with a torque value previously set, and drives the cutter blade downward at the point when the torque value based on the detected electric current reaches the torque value previously set. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a cutting device, and more particularly to driving timing of a cutting blade.

  FIG. 3 shows an example of a cutting machine for cutting a material to be cut such as paper or a bookbinding product. The mounting table 2 for positioning and placing the material to be cut 1 and the material to be cut 1 are not shifted during cutting. It is mainly configured by a pressing member 3 that presses and clamps the workpiece 1 to the mounting table 2 and a cutting blade 4 that cuts the workpiece 1 pressed by the pressing member 3.

  In this case, the pressing member 3 is connected to one end of a lever 5 that swings around a fulcrum shaft P, and the other end of the lever 5 that swings is held by a moving mechanism 7 that moves up and down by the rotation of the motor 6. . The cutting blade 4 is connected to one end of a rod 8, and the other end of the rod 8 is connected to a moving mechanism 10 that moves up and down by the rotation of a motor 9. That is, the initial pressing member 3 and the cutting blade 4 are stopped at the upper standby position, and the workpiece 1 is positioned and mounted on the mounting table 2 at that time. Thereafter, the motor 6 is driven to rotate, the pressing member 3 is lowered, and the workpiece 1 is pressed against the mounting table 2. The motor 6 is driven to rotate, and the motor 9 is driven to rotate after a lapse of a certain period of time, the cutting blade 4 is lowered to cut the object 1 to be cut, and then the cutting blade 4 and the pressing member 3 are raised to a standby position to stand by. Let This completes one cycle of cutting. The cutting blade 4 may be driven by hydraulic pressure.

By the way, the height of the object to be cut is not constant, the motor 6 is driven to rotate, and the above-described method of rotating the motor 9 that moves down the cutting blade 4 after a constant time has elapsed, the object to be cut 1 When the height of the sheet becomes high, the cutting blade 4 does not descend until a certain time elapses even though the workpiece 1 is already pressed by the pressing member 3, so that the time required for one cycle of cutting is reached. There was a drawback that it was longer than necessary. In order to eliminate this drawback, there is one in which the movement of the pressing member 3 is detected by a pulse generator, and the cutting blade 4 is lowered when the pulse from the pulse generator stops for a certain period of time.
JP 2000-254892 A JP 2006-43807 A

However, in the case where the cutting blade is driven by detecting the movement stop of the pressing member in this way, the time required for one cycle of cutting is shortened as the height of the workpiece is increased. There is a problem in that a cutting failure may occur because it does not confirm whether or not it is pressed.

The problem to be solved by the present invention is that the time required for one cycle of cutting can be shortened and the cutting blade can be driven in a state where the pressing member is surely pressing the object to be cut. It is in the point to cancel.

  The present invention has a pressing member that reciprocates up and down and a cutting blade that reciprocates up and down, and is formed by pressing a material to be cut positioned on a table by lowering the pressing member and cutting by lowering the cutting blade. In the apparatus, the pressing member is driven by a motor, and a current detector for detecting a current flowing to the motor is provided, and a torque value based on a detected current value of the current detector is compared with a preset torque value, The main feature is that the cutting blade is driven downward when the torque value based on the detected current reaches the set torque value.

  In the present invention, when the pressing member presses the object to be cut, the current to the motor that drives the pressing member, that is, the torque suddenly increases, and the increase is detected to drive the cutting blade. Therefore, the time required for one cycle of cutting However, the optimum time according to the height of the material to be cut is obtained, and as the height of the material to be cut increases, the time required for one cycle of cutting can be shortened. Cutting can be performed in a state where the object is pressed reliably. Thereby, it is possible to shorten the cutting processing work time and to prevent the occurrence of cutting defects.

In order to shorten the time required for one cycle of cutting and to provide a cutting device capable of driving the cutting blade in a state where the pressing member is surely pressing the workpiece, the pressing member is used to cut the workpiece. This was realized by detecting an increase in current flowing in the motor that drives the pressing member when pressed, and driving the cutting blade based on the detection.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a control circuit block diagram of a cutting device according to an embodiment of the present invention, and FIG. 2 is a flowchart of a control device unit. The cutting machine in this embodiment has the same mechanism as the cutting machine shown in FIG. In FIG. 1, 6 is a motor for driving a pressing member, 9 is a motor for driving a cutting blade, 11 is a cutting control device, 12 is a driving circuit for the motor 6, 13 is a driving circuit for the motor 9, and 14 is a current detector. is there.

The cutting control device 11 is composed of a microcomputer, operates according to a program stored in the ROM based on a cutting start signal, sends a signal to the drive circuit 12 of the motor 6 and the drive circuit 13 of the motor 9, and each motor 6 , 9, 9, and 9, that is, the vertical movement of the pressing member and the cutting blade and the movement stop at the standby position are controlled.

The current detector 14 is disposed on the power supply line of the motor 6 that drives the pressing member, detects the current flowing through the power supply line, and sends the detection signal to the cutting control device 11. The cutting control device 11 acquires a current detection signal of the current detector 14 when the motor 6 is rotating forward, that is, when the pressing member is lowered, and the current detection signal value is converted into a torque value (unit: N) as shown in FIG. ) And is compared with a preset torque value (larger than the torque when the pressing member is moved downward). When the torque value based on the current detection signal becomes equal to a preset torque value in the comparison, a forward rotation drive signal is sent to the drive circuit 13 of the motor 9. As a result, the cutting blade descends to cut the object to be cut positioned on the table.

When the cutting is completed, a reverse rotation driving signal is sent from the cutting control device 11 to the drive circuits 12 and 13 of the motors 6 and 9, and the motors 6 and 9 are rotated in reverse, that is, the pressing member and the cutting blade are moved up and down. When the cutting blade reaches the preset standby position, the rotation of the motors 6 and 9 is stopped, and the pressing member and the cutting blade are held at the standby position. The standby position can be set to a position corresponding to the height of the object to be cut by attaching an encoder or the like to the rotating shaft of the motor 6 and a signal from the encoder.

In the above embodiment, the motor is used to drive the cutting blade, but the cutting blade may be driven by a hydraulic cylinder. In this case, what is necessary is just to control the electromagnetic control valve of the fluid circuit sent to a hydraulic cylinder.

It is a control circuit block diagram of the cutting device which concerns on the Example of this invention. It is a flowchart of the control apparatus part shown in FIG. It is a perspective view which shows an example of the structure of a cutting machine.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cut object 2 Mounting stand 3 Holding member 4 Cutting blade 6 Holding member drive motor 9 Cutting blade drive motor 11 Cutting control device 12, 13 Motor drive circuit 14 Current detector

Claims (2)

  In a cutting apparatus having a pressing member that drives up and down reciprocating and a cutting blade that drives up and down reciprocating, and presses a workpiece positioned on a table by lowering the pressing member and cutting by lowering the cutting blade, The holding member is driven by a motor, and a current detector for detecting a current flowing to the motor is provided. A torque value based on a detected current value of the current detector is compared with a preset torque value, and the detected current is The cutting device, wherein the cutting blade is driven downward when a torque value based on the torque value is set. The cutting device according to claim 1, wherein the cutting blade is driven by a motor.

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