JPS59223127A - Numerical control roll feed device - Google Patents

Abstract

PURPOSE:To obtain a titled device which is capable of executing a fine correction of a band material position by following a press operation, by providing a means for cutting off a motor current, when a pilot pin of a punch holder of a press is inserted into a punch hole of a band material. CONSTITUTION:In a roll feed device for executing a numerical control, when a feed of a band material 1 by rolls 2, 3 is stopped, a punch holder descends, and a pilot pin 11 is inserted into a punch hole 13 of the band material 1. This timing is detected by a rotary cam switch 14, and a relay X is operated. By this operation, the base of output stage transistors 16, 17, 18 and 19 of a motor controlling circuit 15 is grounded. As a result, a current supplied to a motor 4 from power sources 20, 21 is cut off and driving of the motor 4 is stopped. accordingly, the lower roll 3 is released from driving of the motor 4, therefore, a fine correction of the band material 1 is executed, and thereafter, a press work is executed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a roll feed device for press working in which a motor is driven by numerical control.

This type of apparatus normally holds a strip between an upper roll and a lower roll, and drives one of the rolls with a motor to feed the strip a fixed length at a time to perform press working. However, at this time, the length of the strip material fed by the motor is not exactly constant each time, and contains errors, so the length of the strip material is It is necessary to make minor adjustments to the position. For this purpose, a pilot pin with a hemispherical tip is provided in the upper mold holder of the press, and the pilot pin is inserted into the punch hole drilled in the strip material in the previous process, and the center of the pilot pin and the punch hole is Even if there is a slight deviation in the strip, by lowering the pilot bin with a certain amount of force, it will slide around the hole along the curve of the tip of the pilot bin, and the position of the strip material can be moved to make slight corrections. is taken.

However, a loop is usually formed at a position before the strip material is sent to the roll, and a force that always acts on the strip material toward the loop. Therefore, in a numerically controlled roll feed device, even when the strip is stopped, current flows through the motor to keep the strip in place so that the strip does not slide down toward the loop. . Therefore, in such a state, it is not possible to move the strip material to make fine adjustments to the position. For this reason, in the past, a signal was output at the same time as the tip of the pilot pin was inserted into the punch hole, and that signal caused the roll that was not driven by the motor to move away from the strip material using pneumatic actuation. An opening was made and the strip material moved freely to make slight adjustments to its position.

However, with this conventional method using pneumatic actuation,
There was a problem in that there was a delay in the response of opening the roll, and if the number of presses per certain time exceeded a certain value, it became impossible to follow the press operation.

An object of the present invention is to provide a numerically controlled roll feed device that solves the above-mentioned problems and is capable of finely correcting the position of a strip using pilot pins by following the press operation even when the speed of the press operation increases. The goal is to provide the following.

To achieve this objective, the present invention provides a pilot pin provided in the upper die holder of the press.

A motor current cut-off means is provided to cut off the motor current at the timing when the pilot pin is inserted into the punch hole drilled in the strip material, thereby eliminating the rotational force of the motor and allowing the roll to rotate freely when the pilot pin is inserted. It is characterized by the following.

Hereinafter, the present invention will be explained in detail based on illustrated embodiments.

FIG. 1 is a sketch of functional parts of an embodiment of the present invention,
FIG. 2 is a circuit diagram showing an output portion of the motor control circuit of the embodiment shown in FIG.

A strip material 1 is held between an upper roll 2 and a lower roll 3 of a roll feed device. Motor 4 is.

It is driven by numerical control, and its rotation is transmitted to the lower roll 3 via the small pulley 5, belt 6, and large pulley 7, and the lower roll 3 rotates together with the upper roll 2 to roll the strip material 1 at a constant length
is fed onto the lower mold 8.

A punch 10, a pilot pin 11, and an outline cutting die 12 are fixed to the upper die holder 9. The feed length of the strip 1 corresponds to the distance between the punch 10 and the pilot pin 11.

In the first step, a hole 13 is punched with a punch 10. Although this punch hole 13 is a punch hole for the processed product, it also serves as a punch hole into which the pilot pin 11 is inserted. Second
In the process, the outline of the workpiece is cut out using the outline cutting die 12, and at this time, the position of the strip material 1 is slightly corrected by inserting the pilot pin 11 into the punching hole 13. The operation at this time will be explained in detail below.

When the roll 2.3 stops feeding out the strip 1, the upper mold holder 9 is lowered for press working.

First, a pilot pin 11 having a hemispherical tip is inserted into a punch hole 13 in the strip 1. This timing is detected by a rotary cam switch 14 that operates in conjunction with the crankshaft (not shown) of the press. The rotary cam switch 14 is turned on in synchronization with the timing when the pilot pin 11 is inserted into the punch hole 13. When the rotary cam switch 14 is turned on, the power supply voltage (2) is supplied to the relay X, and the relay X is activated. Contact X turns on due to the operation of relay X.

Output stage transistor 16゜17. of motor control circuit 15.
A pace of 18.19 is grounded. As a result, the motor current that has been supplied to the motor 4 from the positive power source 20 and the negative power source 21 is cut off, and the driving of the motor 4 is stopped. Therefore, the lower roll 3 is released from being driven by the motor 4 and can freely rotate. Therefore, the position of the strip 1 can be corrected, and after the position of the strip 1 is slightly corrected by the downward force of the pilot pin 11, press working is performed. When the press work is completed and the upper mold holder 9 rises and the pilot pin 11 comes out of the punch hole 13, the rotary cam switch 14 is turned off and the contact X is turned off.
Motor current is supplied to the motor 4 again, and the motor 4 is driven again.

In the embodiment shown in FIG. 2, the output stage transistor 16°17.1
The motor current was cut off by a method called base cutoff, in which the base of 8.19 was grounded, but as shown in Fig. 3, a contact X was provided between the motor 4 and the motor control circuit 15, and A method of cutting off the motor current is also possible. In this case, contact X is turned off by the operation of relay X.

The output current supply to the motor 4 is cut off. This method is
Compared to the method shown in Figure 2, a larger current must be interrupted at contact There is no delay in response as seen in .

In the embodiment shown in FIG. 2 or 3, the rotary cam switch 14, relay X, and contact X correspond to the motor current interrupting means of the present invention.

As explained above, according to the present invention, the motor current is cut off in synchronization with the timing when the pilot pin provided in the upper mold holder of the press is inserted into the punched hole drilled in the strip material. By providing a means, when inserting the pilot pin, the rotational force of the motor is applied and the roll is freely rotated, so even if the speed of the press operation (7) becomes faster, the pilot will follow the press operation and rotate freely. Minor adjustments can be made to the position of the strip using the bin.

[Brief explanation of the drawing]

FIG. 1 is a sketch of one embodiment of the present invention, FIG. 2 is a circuit diagram of the output portion of the motor control circuit of the embodiment of FIG. 1, and FIG. 3 is a diagram of the motor control circuit of another embodiment of the present invention. It is a circuit diagram of an output part. 1...Band material, 2...Upper roll, 3...Lower roll,
4--motor, 8--lower mold, 9--upper mold holder,
11-... Pilot bin, 13... Punch hole, 14-
...Rotary cam switch, 15...Motor control circuit, X...Relay, X...Contact. Patent applicant: Orii Automatic Machinery Co., Ltd. Representative Minoru Nakamura (8) Figure 1 Figure 2

Claims (1)

[Claims] 1. In a numerically controlled roll feed device equipped with a motor driven by numerical control and a roll driven by the motor, a pilot pin provided in the upper die holder of the press is inserted into a punched hole drilled in the strip material. A numerically controlled roll feed device, characterized in that it is provided with a motor current cutoff means that cuts off the motor current in accordance with the timing of insertion into the roll feed device.