JPH0222240Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention relates to cutting machines used in printing, bookbinding, various paper industries, clothing industries, wall materials industry, leather, synthetic resin sheet processing industries, etc. In particular, the present invention relates to a cutting machine whose clamping force can be easily adjusted.

(Prior Art) Recently, as it has become more common for computers to process paper and the like cut by cutting machines, demands on the processing accuracy of objects to be cut have become stricter. Generally, in order to accurately cut an object with a cutting machine, it is most important that the feed be accurate, that the grinding angle of the knife be appropriate, and that the clamping pressure be appropriate. For feeding, a computer-controlled feeding mechanism has already been adopted, and a unique solution has been taken for the sharpening angle of the knife, but for clamping, a manual hydraulic control valve V (no. 1) was operated to adjust the output of the hydraulic cylinder and the clamping force.

(Problem that the invention aims to solve) When cutting with a cutting machine, it is necessary to change the clamping force as the properties of the material to be cut, such as paper quality and thickness, and the width of the material to be cut, change. However, as previously mentioned, the hydraulic control valve V was placed on the side under the table due to the hydraulic piping, so in order to adjust the hydraulic pressure, it was necessary to bend down and reach out to operate it, making it difficult to adjust it one by one. It was very troublesome to do so. Therefore, even if the width of the workpiece changes as the workpiece is successively cut into smaller pieces, the current situation is that the workpiece is cut without adjusting the clamping force. As a result, the clamp pressure becomes too high and the knife escapes during cutting, or the clamp pressure becomes too low and the knife digs inward, resulting in an error of about 0.2 to 2 mm, making it impossible to perform highly accurate machining. This was the cause of many defective products. Further, there was a problem in that working efficiency was significantly reduced if adjustments were made one by one.

Therefore, an object of the present invention is to provide a cutting machine whose clamping force can be easily adjusted.

(Means for Solving the Problems) In order to solve the problems of the conventional methods, the present invention uses an electromagnetic proportional pressure valve as the pressure control valve to electrically adjust the pressure, thereby allowing the pressure to be adjusted above the table. This makes the operation possible. That is, the present invention provides a cutting machine in which a clamp member is driven by a hydraulic cylinder, and is provided with an electromagnetic proportional pressure valve that adjusts the hydraulic pressure supplied to the hydraulic cylinder, and an electric signal that controls the electromagnetic proportional pressure valve is adjusted. The present invention provides a cutting machine in which an adjustment means is placed at an appropriate position above a table.

(Function) According to this configuration, the hydraulic pressure supplied to the hydraulic cylinder can be adjusted by the electromagnetic proportional pressure valve by simply operating the adjusting means such as a variable resistor located at an appropriate position above the table, and the clamping force can be adjusted. It can be adjusted very easily. By making it possible to easily adjust the clamping force in this way, highly accurate cutting becomes possible.

(Example) Next, an example of the present invention will be described based on the drawings. In FIGS. 1 and 2, a feeding member 2 is disposed on a table 1 and is movable in the front-back direction. The feed member 2 is computer-controlled and moved back and forth by a feed screw mechanism 3 driven by a motor (not shown), and a handle 4 for manual feed is attached to the front end of the feed screw.
Further, this feeding member 2 pushes the rear end of an object to be cut, such as paper, stacked on the table 1 and sends it forward, and its front portion is formed in a comb-teeth shape. A knife 5 is provided near the forward moving end of the feeding member 2.
is arranged so that it can be raised and lowered. The knife 5 is detachably attached to a tool rest 6 that is guided up and down in an oblique direction, and the tool rest 6 is connected to a drive motor 10 via a clamp mechanism 7, a worm gear mechanism 8, and a belt 9.
It is driven up and down. A clamp member 11 is disposed at a position immediately behind the knife 5 so as to be movable up and down, and one end of a pair of links 12 (schematically shown in FIG. 1) is connected to both sides of the clamp member 11. It is connected to one end of a bifurcated rotating lever 13, and the other end of the rotating lever 13 is connected to a hydraulic cylinder 15. Reference numeral 14 denotes a connecting rod that connects the other ends of the rotating levers 13 to each other. The hydraulic cylinder 15
Pressure oil is supplied from a hydraulic pump 17 driven by the drive motor 10 via a belt 16. As shown in FIG. 3, an electromagnetic switching valve 18 is interposed between the hydraulic cylinder 15 and the hydraulic pump 17, and an electromagnetic switching valve 18 is interposed between the hydraulic pump 17 and the electromagnetic switching valve 18. An electromagnetic proportional pressure valve (hereinafter referred to as a servo valve) 20 that also adjusts the hydraulic pressure supplied to the hydraulic cylinder 15 is provided in a relief passage connected to the hydraulic cylinder 15 . Reference numeral 19 denotes a relief valve disposed in the relief passage, and the servo valve 20 is disposed as a pilot valve of this relief valve.

A control electric signal is inputted to the servo valve 20 from a servo amplifier 21, and the servo amplifier 2
As shown in FIGS. 1, 4, and 5, the output signal of 1 can be adjusted by a variable resistor 22 arranged on an operation panel 24 provided on an upper frame 23 above the table 1. It is configured. Furthermore, in this embodiment, as shown in FIGS. 6 and 7, a controller 25 having a built-in microcomputer is configured to automatically perform a plurality of cutting processes, and each cutting process is A plurality of variable resistors 22 are arranged on the operation panel 24 so that the supply pressure to the hydraulic cylinder 15 can be adjusted accordingly, and these variable resistors are selectively connected to the servo amplifier 21 for each cutting process. It is composed of That is, in FIGS. 6 and 7, 26 is a count switch such as a limit switch that is turned on for each cutting process to output a signal, and 27 is a count stop button used when cutting with the same clamping force as in the previous cutting process. , 28 are end buttons for ending the cutting process and instructing to return to the base point;
1 to R10 are a plurality of relays that selectively connect the variable resistor 22 to the servo amplifier 21, and are sequentially switched by the controller 25 according to the cutting process.

In the above configuration, in order to cut the object, the cutting process is programmed in advance on the operation panel 24, and each variable resistor 22 is sequentially adjusted in accordance with the change in the width of the object in each cutting process. I'll keep it. In addition, when cutting with the same clamping force as in the previous process, press the count stop button 27 placed on the side of the variable resistor 22 to connect the same variable resistor 22 again, and press the end button in the final cutting process. Press 28. Then, the object to be cut is loaded on the table 1, and the cutting machine is operated.
Then, the object to be cut is sent out to a predetermined position according to the programmed cutting process, and
An electric signal corresponding to the width of the object to be cut, which is set in advance by the variable resistor 22, is input from the servo amplifier 21 to the servo valve 20, and the supply pressure to the hydraulic cylinder 15 is adjusted. Next, when the two-handed button switch is pressed, the clamp member 11 is lowered by the hydraulic cylinder 15, and after the object to be cut is clamped with an appropriate clamping pressure, the knife 5 is lowered and the object to be cut is cut. When the cutting is finished, the clamp member 11
And the knife 5 stops at the top dead center. The end of the first cutting process is detected by the count switch 26, and the controller 25 is set to the second cutting process. Therefore, change the posture of the object to be cut, set it up again, and restart the operation. Thereafter, the same operation as above is repeated.

In the above embodiment, the hydraulic pressure is adjusted only in accordance with the width of the object to be cut, but the servo amplifier 2
If a variable resistor is connected to 1 to adjust the clamping pressure according to the properties of the material to be cut, such as the quality of paper, or a variable resistor is connected to adjust the clamping pressure according to the degree of wear on the knife 5, even more precise cutting can be achieved. becomes possible. Further, the adjusting means is not limited to a variable resistor, and a variable capacitor or the like may be used.

(Effect of the invention) As is clear from the above explanation, the cutting machine of the invention is provided with an electromagnetic proportional pressure valve that adjusts the hydraulic pressure supplied to the hydraulic cylinder that drives the clamp member. Since the adjustment means for adjusting the electrical signal to be controlled is placed at the appropriate location above the table, the clamping force can be easily adjusted by simply adjusting the adjustment means above the table. This eliminates the possibility of producing defective products due to improper cutting, and there is no reduction in work efficiency due to adjustment. Since no force is applied, it maintains the accuracy of the machine and extends its service life, which has great practical effects.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Fig. 1 is an overall front view, Fig. 2 is a side view, Fig. 3 is a hydraulic circuit diagram,
FIG. 4 is a front view of the operation panel, FIG. 5 is an enlarged view of section A in FIG. 4, and FIGS. 6 and 7 are control circuit diagrams. DESCRIPTION OF SYMBOLS 1... Table, 2... Feeding member, 5... Knife, 11... Clamping member, 15... Hydraulic cylinder, 17... Hydraulic pump, 20... Servo valve (electromagnetic proportional pressure valve), 21... Servo Amplifier, 22...
...variable resistance (adjustment means).

Claims (1)

[Claims for Utility Model Registration] (1) A feeding member that sends out a workpiece loaded on a table, a knife that cuts the workpiece by moving up and down, and a clamp member that presses the workpiece when cutting with the knife. In the cutting machine, the clamping member is driven by a hydraulic cylinder, and an electromagnetic proportional pressure valve is provided for adjusting the hydraulic pressure supplied to the hydraulic cylinder, and an electric signal for controlling the electromagnetic proportional pressure valve is adjusted. A cutting machine characterized in that an adjusting means for adjusting the adjustment is arranged at a proper position above the table. (2) The cutting machine according to claim 1, wherein the adjusting means comprises a plurality of variable resistors selectively connected to a servo amplifier that outputs an electric signal to an electromagnetic proportional pressure valve.