JP2009000797A - Cutting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To always shorten time taken for a series of processes of cutting, regardless of the height of an object to be cut. <P>SOLUTION: This cutting device has a pressing member vertically and reciprocatively driven by driving a motor 24 and a cutting blade vertically and reciprocatively driven by driving a motor 28, and presses the object 1 to be cut positioned on a base by lowering the pressing member and cuts the object 1 by lowering the cutting blade. The motor 24 is provided with an encoder 38 to detect height and position of the object 1 to be cut. Prescribed amount is added to the height of the object 1 detected by the encoder 38, and the added amount is set as a standby position of the pressing member in a setting memory 31d. Further, prescribed amount is added, and the added amount is set as a standby position of the cutting blade in the setting memory 31d. The pressing member and the cutting blade are made to stand by at positions having each of the set values, and the cutting is performed by lowering the pressing member and the cutting blade from the positions. As a result, the time taken for a cutting one cycle is shortened since the pressing member and the cutting blade are made to stand by at the positions corresponding to the height of the object 1. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a cutting apparatus, and more particularly to adjustment of a standby position of a pressing member and a cutting blade.

  FIG. 4 shows an example of a conventional cutting machine for cutting a cut object such as paper, a book or a sheet material such as resin or wood. In FIG. 4, 1 is an object to be cut and 2 is a sheet to be cut. A mounting table for positioning and mounting the object 1, a pressing member 3 for pressing and clamping the workpiece 1 to the mounting table 2 so that the cutting object 1 does not shift during cutting, and a cutting member 4 pressed by the pressing plate 3. A cutting blade for cutting the object 1.

  The holding plate 3 is connected to the tension spring 5 via the chain 6 and is connected to the piston rod 8a of the single-acting hydraulic cylinder 8, and the holding plate 3 is normally positioned above the mounting table 2 by the spring force of the tension spring 5. The piston rod 8a of the hydraulic cylinder 8 at the time of cutting is driven and descends against the spring force of the tension spring 5, and presses and clamps the workpiece 1 on the mounting table 2. After cutting, the spring force of the tension spring 5 returns to the upper position of the mounting table 2. Reference numeral 7 denotes a sprocket that guides the chain 6.

  The cutting blade 4 is connected to the piston rod 9a of the double-acting hydraulic cylinder 9. The cutting blade 4 waits at a position above the mounting table 2 by the normal hydraulic cylinder 9, and the piston rod 9a of the hydraulic cylinder 9 at the time of cutting is driven downward. Cut the cut object 1 on 2. After the cutting, the piston rod 9a of the hydraulic cylinder 9 is driven upward to return to the upper position of the mounting table 2 and wait.

Such a cutting machine is provided with a timer for setting the time between the drive of the hydraulic cylinder 8 and the drive of the hydraulic cylinder 9, and the drive of the time cutting blade 4 set in this timer is started by the press plate 3. Control is performed so that cutting is performed in a state in which the object to be cut 1 is securely pressed by the pressing plate 3 later than the start of driving. That is, every time the cutting instruction switch is pressed, the timer is driven, and the cutting blade 4 is lowered after the lowering of the pressing member 3 to cut the workpiece 1, and then the pressing member 3 and the cutting blade 4 are moved back to the original. To the standby position. A series of steps in which the pressing member 3 and the cutting blade 4 return to the original standby position from the lowering of the pressing member 3 takes a substantially constant time regardless of the height of the object 1 to be cut. In order to do this, it is considered that when the height of the cut object 1 is high, the start of the lowering of the cutting blade 4 is accelerated.
JP 2000-254892 A JP 2006-43807 A

However, in the cutting apparatus that has accelerated the start of the lowering of the cutting blade in this way, when the height of the material to be cut is always high, the time required for a series of steps of cutting can be shortened. When the height of the sheet becomes low, there is a problem that the time required for a series of cutting processes cannot be shortened.

The problem to be solved by the present invention is to always reduce the time required for a series of cutting processes regardless of the height of the object to be cut, and to solve such problems.

The present invention includes a mounting table on which the object to be cut is mounted, a holding member that waits above the mounting table, presses the object to be cut that has been lowered during cutting and mounted on the mounting table, The cutting blade that waits above the mounting table, cuts the workpiece that is lowered and placed on the mounting table at the time of cutting, and the height of the cutting object that is placed on the mounting table with the upper standby position of the pressing member. And an upper standby position setting means for the cutting blade that sets the upper standby position of the cutting blade according to the height of the workpiece to be cut placed on the mounting table. At the time of cutting, the main feature is that the pressing member and the cutting blade are waited at the upper standby position set in the upper standby position setting means of the pressing member and the cutting blade, and are lowered from the standby position.

  In the present invention, since the upper standby position of the pressing member and the cutting blade is set according to the height of the object to be cut at the time of cutting, the time required for a series of cutting processes is always required regardless of the height of the object to be cut. It is possible to shorten the time, and in particular, it is possible to greatly reduce the time required for the cutting process when continuously cutting a cut object having a low height.

Regardless of the height of the material to be cut, the pressing member and the cutting blade are each driven by a motor for the purpose of always reducing the time required for a series of cutting processes. The position of the pressing member and the cutting blade and the height of the object to be cut are detected, and the holding member and the cutting blade are made to wait at the time of cutting at a position corresponding to the height of the object to be cut, and cutting is performed from that position. Realized by starting.

Embodiments of the present invention will be described below with reference to FIGS. FIG. 1 is a circuit block diagram of a cutting control apparatus according to an embodiment of the present invention, FIG. 2 is an operation explanatory view of the cutting control apparatus shown in FIG. 1, and FIG. 3 is a perspective view showing the configuration of the cutting machine. In FIG. 3, reference numeral 1 denotes an object to be cut, 20 a mounting table for positioning and mounting the object to be cut, and 21 a pressing member that presses and clamps the object 1 to the mounting table 20 so that the object to be cut 1 does not shift during cutting. , 22 is a cutting blade for cutting the workpiece 1 pressed by the pressing member 20.

  The holding member 21 is connected to one end of a lever 23 that swings around a fulcrum shaft P. The other end of the lever 23 that swings is screwed into a feed screw 25 that rotates by the rotation of a motor (servo motor) 24. It is held by a moving mechanism 26 that moves upward or downward as the feed screw 25 rotates. The cutting blade 22 is connected to one end of a rod 27, and the other end of the rod 27 is screwed into a feed screw 29 that rotates by rotation of a motor (servo motor) 28, and moves upward or downward by rotation of the feed screw 29. Is held by the moving mechanism 30.

Initially, the pressing member 21 and the cutting blade 22 are stopped at a standby position above the mounting table 20, and the workpiece 1 is positioned and mounted on the mounting table 20 at that time. Thereafter, the motor 24 is rotationally driven, the pressing member 21 is lowered to press the workpiece 1 against the mounting table 20, the motor 28 is rotationally driven, and the cutting blade 22 is lowered to cut the workpiece 1. After the cutting, the motors 24 and 28 are reversed, and the cutting blade 22 and the pressing member 21 are raised to the standby position to be on standby. This completes one cycle of cutting.

This cutting cycle is performed by an output signal from the cutting control device shown in FIGS. In FIG. 1, 31 is a cutting control device, 32 is a display device for displaying control contents, 33 is an input operation device for inputting setting values, and 34 is a motor drive of a motor 24 for driving a pressing member 21 (see FIG. 3). Circuit 35, a motor drive circuit of a motor 28 that drives the cutting blade 22 (see FIG. 3), 36 a current detector that detects a current flowing through a power supply line of the motor 24, 37 a rotation direction detector, and 38 a motor 24. The rotary encoder 39 is attached to the rotary shaft of the motor 28, and the rotary encoder 39 is attached to the rotary shaft of the motor 28. The detection outputs of the current detector 36, the rotational direction detector 37, and the rotary encoders 38 and 39 are sent to the cutting control device 31. It is done.

The cutting control device 31 pressurizes a central processing unit (CPU) 31a, a ROM 31b storing a program for executing the CPU, an input / output interface 31c, a standby position of the pressing member 21, a standby position of the cutting blade 22, and the pressing member 21. A setting value memory 31d for storing a setting value such as torque is provided. When cutting is started based on a cutting start signal, the operation is performed as shown in FIG.

That is, a forward drive signal is output to the motor drive circuit 34, and the pressing member is lowered. At this time, a current value is input from the current detector 36, the current value is converted into a torque value, compared with a preset torque value, and the converted torque value reaches the set torque value (the pressing member is to be cut). When the torque is pressed, the torque increases rapidly), and the rotary encoder 38 stores the position of the pressing member at the time of arrival in the set value memory 31d. This stored value is the height of the object to be cut. Based on this height, 20 to 30 mm is added to the height, and the value is set in the set value memory 31d as the standby position of the pressing member, and further, the set value of the standby position of the pressing member is about 5 mm. And is set in the set value memory 31d as a standby position of the cutting blade.

Next, a forward drive signal is output to the motor drive circuit 35, the cutting blade is lowered, and when the lowermost position is reached, a reverse drive signal is output to the motor drive circuit 35 to raise the cutting blade. When the cutting edge of the cutting blade rises and reaches the position of the pressing member, a reverse drive signal is output to the motor drive circuit 34 to raise the pressing member. When the cutting blade continues to rise and reaches the standby position of the cutting blade set in the set value memory 31d, a stop signal is output to the motor drive circuit 35 to stop the cutting blade. Further, when the pressing member reaches the standby position of the pressing member set in the set value memory 31d by raising the pressing member, a stop signal is output to the motor drive circuit 34 to stop the pressing member. The next cutting is started in a state where the pressing member and the cutting blade are in the stop position, that is, the standby position. As a result, the holding member 21 and the cutting blade 22 stand by at an upper position corresponding to the height of the workpiece 1 when the height of the workpiece 1 is high and low when the workpiece 1 is low. The time required for the cycle is reduced. The positions of the pressing member and the cutting blade are acquired from the rotary encoders 38 and 39.

In the embodiment, the height of the object to be cut is acquired by driving the pressing member, but the height of the object to be cut may be input from the input operation device as a value measured in advance. In this case, it is convenient to provide a scale or height detector for measuring the height of the object to be cut on the mounting table. Further, whether or not to change the upper standby position of the cutting blade and the pressing member can be selected at any time by operating the input operation device.

It is a circuit block diagram of the cutting control apparatus which concerns on the Example of this invention. It is operation | movement explanatory drawing of the cutting control apparatus shown in FIG. It is a perspective view which shows the structure of the cutting machine which concerns on the Example of this invention. It is a front view which shows the structure of the conventional cutting machine.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cut object 20 Mounting base 21 Holding member 22 Cutting blade 23 Oscillating lever 24 Holding member drive motor 25 Feed screw 26 Holding member moving mechanism 27 Rod 28 Cutting blade drive motor 29 Feed screw 30 Cutting blade moving mechanism 31 Cutting control device 31a CPU
31b ROM
31c I / O
31d Setting memory 32 Display device 33 Input operation device 34 Motor drive circuit 35 for motor driving the pressing member Motor drive circuit 36 for motor driving the cutting blade 36 Current detector 37 Rotation direction detector 38, 39 Encoder

Claims (3)

  A mounting table on which the object to be cut is placed, a holding member that waits above the mounting table, descends at the time of cutting, and presses the workpiece to be placed on the mounting table, and above the mounting table The cutting blade that cuts the workpiece that is lowered and placed on the mounting table upon cutting, and the upper standby position of the pressing member is set according to the height of the workpiece that is placed on the mounting table. An upper standby position setting means for the pressing member to be cut, and an upper standby position setting means for the cutting blade for setting the upper standby position of the cutting blade according to the height of the workpiece to be cut placed on the mounting table. The cutting device is characterized in that the pressing member and the cutting blade are waited at an upper standby position set in the upper standby position setting means of the pressing member and the cutting blade and are lowered from the standby position. The cutting device according to claim 1, wherein the pressing member and the cutting blade are moved up and down by a servo motor. A measuring means for measuring the height of the workpiece placed on the mounting table is provided, and a value obtained by adding a predetermined value to the measured value of the measuring means is set in the upper standby position setting means of the pressing member and the cutting blade. The cutting apparatus according to claim 1 or 2, wherein the cutting apparatus is configured as follows.

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