JPS6350097B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control circuit for driving a leveler feeder for feeding a material into a press machine.

A press machine that presses in continuous operation is designed to feed a coil material (material) wound around an uncoiler to the required length via a leveler feeder in conjunction with the press operation. At this time, the coil material is removed by a leveler to remove curling curls formed while being wound into a coil, and is then fed to a press machine by a feeder. The leveler has a plurality of work rolls arranged one above the other, and removes the curl by passing the material between the work rolls.

In a leveler, the work roll of the leveler and the feed roll of the feeder are simultaneously rotated and stopped 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. On the other hand, the work rolls of a leveler are used to flatten curled materials, so while the material is moving, it flattens the material, but when the material is stopped, roll marks are created on the material by the pressure of the rolls. However, a problem arose in that the flatness was impaired.

An object of the present invention is to provide a control circuit for a leveler feeder that eliminates the above-mentioned drawbacks.

Therefore, the feature of the present invention is that the leveler and feeder are separated and slightly separated, the work roll motor and the feed roll motor are operated independently, and they are operated simultaneously to feed the material. At the same time, the work roll motor is rotated at an extremely low speed even when the feed roll is stopped.

The illustrated embodiment will be described below. FIG. 1 is an overall side view of a leveler feeder using a control circuit according to an embodiment of the present invention, in which a material 1 such as an iron plate wound into a coil is unwound by an uncoiler 2 and guided to a leveler 3. The control circuit consisting of the coil pressers 4, 5, the coil opener 6, the light emitting element 7 and the light receiving elements 8, 8 for controlling the amount of rewinding is not particularly different from the conventional one.

In this leveler feeder, the leveler 3 and feeder 9 are mounted on a stand 10 with the leveler 3 and feeder 9 separated. The leveler 3 itself has a side guide roll 11 for determining the width of the material 1, a pinch roll 12, a work roll 13, a work roll pressure handle 14 for adjusting the pressure of the work roll, and a motor 15, as in the prior art. Similarly, feeder 9 also has side guide roll 1.
6. Feed roll 17 and feed roll 17
It has a motor 18 that rotates. In this embodiment, both motors 15 and 18 are independent, and operate simultaneously by a control circuit to be described later, but when stopped, only the motor 18 is stopped, and the motor 15 is rotated at an extremely low speed. It is structured as follows.

A circuit for driving and controlling these motors is shown in FIG. The feed length setting device 19 consists of a digital switch or the like that 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 used for one operation. It is for sending in. The value set by the feed length setting device 19 is latched to the register 21 of the creep amount setting counter 20, and in response to the starting signal 22 after the end of pressing of the press machine, the value set by the feed length setting device 19 is sent to the deviation counter 24 of the leveler via the auxiliary counter 23. and is directly input to the deviation counter 25 of the feeder. The motors 15 and 18 are provided with pulse generators 26 and 27, respectively.
is attached, and the output of the pulse generator 27 is directly input to the negative input of the deviation counter 25. On the other hand, the output of the pulse generator 26 is inputted to the minus input of the deviation counter 24 and the auxiliary counter 23 via the pulse switching circuit 28. The creep amount setting counter 20 has register 2 as described above.
1 and an auxiliary counter 23, and a value obtained by subtracting the value counted by the auxiliary counter 23 from the value set by the feed length setting device 19 is input to the deviation counter 24. The deviation counter 24 is configured to output a feed completion signal 29 to the pulse switching circuit 28 when the number of remaining pulses reaches a pulse.

The pulse switching circuit 28 includes two AND gates 3
0, 31 and an inverter 32, the output of the pulse generator 26 is used as one input of both gates, and the feed completion signal 29 and its inverted signal are given to the other input. The output of the AND gate 31 is connected to the negative input of the deviation counter 24, and the output of the AND gate 30 is connected to the auxiliary counter 23.
is input. The outputs of the respective deviation counters 24 and 25 are converted into analog quantities by D/A converters 33 and 34, and amplified by amplifiers 35 and 36 to rotate the motors 15 and 18, respectively.

A voltage application circuit for applying a bias voltage to the amplifier 35 is further provided in the drive circuit of the leveler motor 15. This voltage application circuit sends the voltage generated on the sliding piece 38 of the variable resistor 37 and applies it to the amplifier 35 in response to the completion signal 29.
Motor 15 with the voltage added to the output of the D/A converter
It is becoming more and more like driving.

The operation of the above embodiment will be described below. First, the feed length is set by the feed length setting device 19 in consideration of the length of the material required for one press.
The auxiliary counter 23 is not counting before the press is operated. When the operation is started and the start signal 22 is sent to the creep amount setting counter 20, the latched feed length is sent to the deviation counter 24 via the auxiliary counter 23, and at the same time as the motor 15 starts rotating, the deviation counter 25 The value of the feed length setting device 19 is also given to the motor 18, and the motor 18 rotates. That is, the motors 15 and 18 begin to rotate and feed the material 1 to the press machine. At this time, feedback pulses from pulse generators 26, 27 are sent to deviation counters 24, 25 in accordance with the rotation of the motor. Since the feed completion signal 29 has not yet been generated, the gate 31 is opened by the inverter 32 and the feedback pulse is applied to the deviation counter 24.
As the motor rotates, the value set by the feed length setting device decreases, and when there are only a few pulses remaining, the deviation counter 24 generates a feed completion signal, and the AND gate 3
1 and open the AND gate 30. Therefore,
The feedback pulse from the pulse generator 26 is not applied to the minus input side of the deviation counter 24, but is applied to the auxiliary counter 23. Since no feedback pulse is applied to the deviation counter 24, a speed command voltage corresponding to several pulses is applied, and the motor 15 rotates at an extremely low speed. The number of rotations is counted by an auxiliary counter 23. This motor 1
When the motor 15 rotates at low speed, the voltage generated in the sliding piece 38 of the variable resistor 37 by the feed completion signal 29 is applied to the amplifier 35, and this voltage is added to the voltage for the several pulses. to drive. This additional voltage reduces the speed difference when transitioning from high-speed operation to low-speed operation.

Meanwhile, on the feeder side, the feedback pulse from the pulse generator 27 continues until the speed command becomes zero in the deviation counter 25, and the feed length setting device 1
It will stop when it reaches the value supported by 9.

That is, as shown in FIG. 1, just before feeding a predetermined amount of material 1, the motor 15 of the leveler 3 is set to an extremely low speed, and while this low speed is continued, the feeder 9 is
Then, the feed material 1 is stopped after being fed a predetermined amount.

During this stop period, the material 1 continues to be fed slowly from the leveler 3 without stopping, and the material 1 becomes slack between the feeder 9 and the leveler 3.

During this time, when the press machine finishes operating, the start signal 22 is again applied to the creep amount setting counter 20, and simultaneously applied to the deviation counter 25 of the feeder 9, so that the motor 15 starts rotating. In the motor 15 of the leveler 3, since the value counted during the stop period remains in the auxiliary counter 22, that amount is subtracted and input to the deviation counter 24, and the motor 15 is rotated by the subtracted value. This low speed portion is for correcting the slack portion.

When there are only a few pulses remaining, the feed completion signal 29 is generated as described above, and the aforementioned operation is repeated.

As described above, according to the present invention, while a predetermined amount of material is fed into the press machine and stopped, the leveler continues to feed the material at an extremely low speed, thereby minimizing the occurrence of roll marks caused by the work roll of the leveler. The flatness of the material can be better maintained. In addition, the voltage application circuit speeds up the rotation of the leveler motor slightly at low speeds, so the effect on the material when shifting to low speeds can be minimized and the flatness of the material can be improved. can.

In other words, if the speed was suddenly reduced, the speed would drop to a lower speed than the planned speed due to the reaction, and there was a risk that roll marks would be formed.However, by increasing the voltage, this can be made faster and the flatness can be further improved.

[Brief explanation of the drawing]

FIG. 1 is a side view of a leveler feeder of a press using the present invention, and FIG. 2 is a block diagram of an embodiment of the present invention. 1...Material, 2...Uncoiler, 3...Leveler, 9...Feeder, 13...Work roll, 1
5, 18...Motor, 19...Feed length setting device,
20... Creep amount setting counter, 24, 25...
... Deviation counter, 26, 27... Pulse generation circuit, 28... Pulse switching circuit, 37... Variable resistor.

Claims (1)

[Claims] 1 A leveler feeder that integrates an uncoiler, a leveler, and a feeder in order to intermittently feed a coiled metal sheet material to a press machine.The leveler and feeder are separated, and a leveler drive motor and a feeder drive motor are installed. In the control circuit of the leveler feeder, which drives the motor and the motor separately according to the value set in the feed length setting device that sets the length of material required for one press, the drive circuit of the leveler drive motor includes: A deviation counter is provided to issue a feed completion signal several pulses before the value set in the feed length setting device becomes zero, and the motor is operated with the voltage for the few pulses remaining after the feed completion signal is generated, A control circuit for a leveler feeder used in a press machine, comprising a voltage application circuit that applies a bias voltage to the voltage based on the feed completion signal.