JPH0321246B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a control device for driving a leveler feeder that feeds a material to a press machine.

(Prior Art) A press machine that operates continuously is designed to feed a required length of material wound into a coil into the press machine via a leveler feeder in conjunction with the press operation. At this time, the coil material is fed to a press machine by a feeder after the curling curls formed while being wound into a coil are removed by a leveler. The leveler has a plurality of work rolls arranged above and below, and the material is passed between the work rolls to remove curls.

In conventional leveler feeders, the work roll of the leveler and the feed roll of the feeder are simultaneously rotated by the same motor to feed a certain length of material into a press machine. Therefore, while being pressed by the press machine, the material is stopped within the leveler feeder. In addition, since the work roll of the leveler is used to flatten the curled material, it flattens the material while it is moving, but when the feeder is stopped, the pressure of the work roll flattens the material. The problem is that it creates roll marks on the material, which in turn impairs its flatness.

(Problems to be Solved by the Invention) The present invention solves the above problems and prevents roll marks from forming on the material by continuing to operate the leveler at an extremely low speed even when the feeder is stopped. It is an object of the present invention to provide a control device for a leveler feeder that prevents the above problems.

(Means for solving the problem) Means for solving the problem in the present invention are as follows:
a feed length setter that sets the length of material required for one press; and a feeder motor drive that operates the feeder drive motor according to the value set in the feed length setter when a start signal is input. circuit and
and a leveler motor drive circuit that operates the leveler drive motor according to the value set in the feed length setting device when a start signal is input, and the leveler motor drive circuit operates according to the rotation of the leveler drive motor. a leveler-side pulse generator that generates a feedback pulse; an auxiliary counter that subtracts a value counted when the feedback pulse is input from the value of the feed length setter; and a leveler-side pulse generator that generates a feedback pulse; The value subtracted from the value by the auxiliary counter is used as a positive input, and the feedback pulse is used as a negative input to output the difference to drive the leveler drive motor, and immediately before the difference becomes zero, the leveler is driven. a leveler-side deviation counter that keeps the motor at an extremely low speed and outputs a feed completion signal; and, in response to the feed completion signal, the feedback pulse is input from the leveler-side deviation counter to the auxiliary counter. This is characterized by comprising a pulse switching circuit that switches to the input of the pulse switching circuit.

(Function) The feed length set by the feed length setter 19 is latched to the creep amount setter 20 by the first start signal 22, and the same number of pulses is sent to the leveler side deviation counter 24.
Then, it is sent to the feeder side deviation counter 25, and the leveler drive motor 15 and feeder drive motor 18 are rotated.

The feeder side deviation counter 25 sets the speed command voltage to zero when the number of remaining pulses becomes zero, and therefore the feeder drive motor 18 stops. On the other hand, the leveler side deviation counter 24 outputs a feed completion signal 29 to the pulse switching circuit 28 when there are several pulses remaining. When the feed completion signal 29 is output, the AND gate 31 closes and the AND gate 30 opens.

Since the feedback pulse from the leveler side pulse generator 26 is cut off by the pulse switching circuit 28, the pulses of the leveler side deviation counter 24 are not subtracted, but a state in which the speed command voltage corresponding to several pulses continues to be generated continues. Therefore, the leveler drive motor 15 continues to rotate at a slow speed due to the speed command voltage. The amount of rotation at this time is fed back to the auxiliary counter 23 of the creep amount setter 20 by the pulse switching circuit 28, and is accumulated as the number of pulses until the next activation signal 22 is received.

When the second start signal 22 comes, the creep amount setter 20 reads the feed length again, sends a pulse corresponding to the feed length to the feeder side deviation counter 25, and sends a pulse to the feeder side that corresponds to the feed length to the leveler side. Pulses obtained by subtracting the pulses accumulated by the auxiliary counter 23 are sent to the feeder side deviation counter 24. Repeat this from now on.

(Example) FIG. 1 is a side view of a leveler feeder using a control device of the present invention, in which a material 1 wound into a coil is unwound by an uncoiler 2 and drawn out to a leveler 3. The coil pressers 4, 5, coil opener 6, and a control circuit consisting of a light emitting element 7 and a light receiving element 8 for controlling the amount of unwinding are not particularly different from the conventional ones.

The leveler 3 and feeder 9 are mounted on a machine base 10 with a slight distance between them. The leveler 3 includes a side guide roll 11 for determining the width of the material 1, a pinch roll 12, a work roll 13, and a pressure adjustment handle 1 for adjusting the pressure of the work roll 13.
4 and a leveler drive motor 15. or,
The feeder 9 has a side guide roll 16, a feed roll 17, and a feeder drive motor 18 for rotating the feed roll 17.

In the embodiment, both of the drive motors 15 and 18 described above are independent and are operated simultaneously by a control circuit to be described later, while only the feeder drive motor 18 is stopped when feeding of the material is completed, and the leveler drive motor 15 is stopped. is configured to continue rotating at an extremely low speed.

FIG. 2 shows a circuit for controlling these drive motors. The feed length setting device 19 consists of a digital switch, etc., which sets the length of the material 1 required for one press according to the object to be pressed, and only the length set there is set in one operation. It is for sending. The value set by the feed length setting device 19 is latched in the register 21 of the creep amount setting device 20, and is sent to the leveler side deviation counter 2 via the auxiliary counter 23 in response to the starting signal 22 of the press machine.
4 and input directly to the feeder side deviation counter 25 without going through the auxiliary counter 23. A leveler-side pulse generator 26 and a feeder-side pulse generator 27 are attached to the leveler drive motor 15 and feeder drive motor 18, respectively. In addition,
The output of the feeder side pulse generator 27 is directly input to the negative input of the feeder side deviation counter 25.

On the other hand, the output of the leveler side pulse generator 26 is inputted to the negative input of the leveler side deviation counter 24 and the auxiliary counter 23 via a pulse switching circuit 28. Further, the output of the leveler deviation counter 24 is converted into an analog signal by a D/A converter 33, and amplified by an amplifier 35 to rotate the leveler drive motor 15, and when there are only a few pulses remaining, the output is converted to analog. It is configured to output a completion signal 29 to the pulse switching circuit 28. Furthermore, the output of the feeder-side deviation counter 25 is converted into analog by a D/A converter 34 and amplified by an amplifier 36 to rotate the feeder drive motor 18.

The pulse switching circuit 28 is composed of two AND gates 30, 31 and an inverter 32, and the output of the leveler side pulse generator 26 is used as one input of both gates, and the other input is used as the feed completion signal 29 and the inverter 32. This is the determined signal. The output of the AND gate 31 is connected to the negative input of the leveler side deviation counter 24, and the output of the AND gate 30 is input to the auxiliary counter 23.

In the operation of the present invention, first, the feed length is set by the feed length setting device 19. The auxiliary counter 23 does not count before the press machine operates. When the operation is started and the start signal 22 is sent to the creep amount setter 20, the latched feed length is displayed on the auxiliary counter 2.
3 to the leveler side deviation counter 24,
As the leveler drive motor 15 starts rotating,
The latched feed length is also directly sent to the feeder side deviation counter 25, and the feed drive motor 18 is rotated. That is, two drive motors 15, 18
rotate at the same time and send out the material 1 to the press machine.
At that time, according to the rotation of each drive motor 15, 18, a feedback pulse from the leveler side pulse generator 26 is sent to the pulse switching circuit 28, and a feedback pulse from the feeder side pulse generator 27 is sent to the feeder side deviation. It is sent to the counter 25. Since the feed completion signal 29 is not generated at this time, the AND gate 31 is opened by the inverter 32, and the feedback pulse from the leveler side pulse generator 26 is applied to the deviation counter 24.

As the drive motors 15 and 18 rotate, the value set by the feed length setting device 19 decreases. When the leveler side deviation counter 24 has only a few pulses remaining, a feed completion signal is generated from the leveler side deviation counter 24, and the AND gate 31 is closed and the AND gate 30 is opened. Therefore, the value of the leveler side deviation counter 24 is fixed at that value, and the feedback pulse from the leveler side pulse generator 26 is given to the auxiliary counter 23. Since the leveler side deviation counter 24 is maintained in a state in which a few pulses remain due to the switching of the pulse switching circuit 28, the leveler drive motor 15 is kept at an extreme level that does not stop due to the speed command voltage for the few pulses. Rotates at low speed. The number of rotations at this time is counted by the auxiliary counter 23.

On the other hand, the feeder drive motor 18 continues to send feedback pulses from the feeder-side pulse generator 27 to the feeder-side deviation counter 25 until the speed command becomes zero, and reaches the value given by the feed length setting device 19. Stop when

That is, just before finishing feeding the material 1 by a predetermined amount, the leveler drive motor 15 of the leveler 3 is set to an extremely low speed,
While continuing the low speed, the feeder 9 stops after feeding the material 1 by a predetermined amount. Even when the feeder is stopped, the material 1 continues to be fed slowly from the leveler 3 without stopping, and a loop is formed by the material 1 between the feeder 9 and the leveler 3.

During this time, when the start signal 22 is again given to the creep amount setter 20 from the press machine, the creep amount setter 20 reads the feed length again and sends a pulse to each deviation counter 24, 25. The feeder drive motor 15 starts rotating by the pulse given to the feeder side deviation counter 25. However, since the value counted by the creep operation of the leveler while the feeder is stopped remains in the auxiliary counter 23, the pulses subtracted by that amount are given to the leveler-side deviation counter 24, and the subtracted pulses drive the leveler. Rotate the motor 15. Then, when there are only a few pulses remaining, the feed completion signal 29 is generated as described above, and this operation is repeated thereafter.

If the press spm (stroke per minute) is constant, the loop amount between the leveler part and the feeder part will always be the same and can be synchronized with a small loop amount.

(Effects of the Invention) The present invention inputs the value set by the feed length setting device and the feedback pulse generated by the rotation of the leveler drive motor and the feeder drive motor into each deviation counter, and uses the difference to input the feedback pulses generated by the rotation of the leveler drive motor and the feeder drive motor. On the other hand, the leveler drive motor stops inputting the feedback pulse to its deviation counter and switches to the input to the auxiliary counter just before the end of feed, and the leveler drive motor is driven at the same time. Since the leveler is continuously rotated at a low speed, that is, at a low speed that does not stop, it is possible to minimize the occurrence of roll marks caused by the work roll of the leveler.

Furthermore, the present invention rotates the leveler drive motor at an extremely low speed compared to the normal feed speed while waiting to feed the material, so the distance between the leveler and the feeder is short and the amount of slack in the material can be increased. It is possible to continuously supply material to the press machine even when there is no press machine available.

[Brief explanation of the drawing]

FIG. 1 is a side view of a leveler feeder using the control device of the present invention, and FIG. 2 is a block diagram of the control circuit. 1... Material, 2... Uncoiler, 3... Leveler, 4, 5... Coil holder, 6... Coil opener, 7... Light emitting element, 8... Light receiving element, 9... Feeder, 10... Machine Base, 11... Side guide roll, 12... Pinch roll, 13... Work roll, 14... Pressure adjustment handle, 15... Leveler drive motor, 16... Side guide roll, 1
7...Feed roll, 18...Feeder drive motor, 19...Feed length setter, 20...Creep amount setter, 21...Register, 22...Start signal, 23...Auxiliary counter, 24...Leveler Side deviation counter, 25...Feeder side deviation counter,
26...Leveler side pulse generator, 27...Feeder side pulse generator, 28...Pulse switching circuit, 2
9... Completion signal, 30, 31... And gate,
32...Inverter, 33, 34...D/A converter, 35, 36...Amplifier.

Claims (1)

[Claims] 1 A leveler feeder that integrates an uncoiler, a leveler, and a feeder in order to intermittently feed a coiled metal material to a press machine, and the leveler and feeder are separated and the leveler drive motor and feeder drive motor are In a control device for a leveler feeder that is controlled and driven separately, there is a feed length setter that sets the length of material required for one press, and a value set in the feed length setter when a start signal is input. It has a feeder moder drive circuit that operates the feeder drive motor, and a leveler motor drive circuit that operates the leveler drive motor according to a value set in the feed length setting device when a start signal is input. a leveler side pulse generator in which a leveler motor drive circuit generates a feedback pulse in accordance with the rotation of the leveler drive motor;
an auxiliary counter that subtracts the value counted at the time of inputting the feedback pulse from the value of the feed length setting device; and an auxiliary counter that adds the value subtracted by the auxiliary counter from the value set in the feed length setting device. As an input, the feedback pulse is used as a negative input to output the difference to drive the leveler drive motor, and just before the difference becomes zero, the leveler drive motor is set to an extremely low speed and continues in that state, and the feeding is completed. The leveler side deviation counter outputs a signal, and a pulse switching circuit switches the feedback pulse from being input to the level side deviation counter to being input to the auxiliary counter in response to the feed completion signal. Leveler feeder control device used in press machines.