JPS59104215A - Control circuit of leveler feeder used for press machine - Google Patents

Abstract

PURPOSE:To keep always a metallic sheet flat and free from roll mark by driving a leveller at a low speed even when a feeder is in a stopped state, in the continuous press working of a coil-shaped metallic sheet. CONSTITUTION:The amount of feed by a feeder 9 is inputted to a register 21 from a setter 19. A counting signal is inputted to a feeder deviation counter 25 by a starting signal outputted from a press to drive a feeder motor 18. A pulse of the amount of feed is inputted to the deviation counter 25 from a pulse generating circuit 27 to stop the motor 18 after completing a prescribed amount of feed. A counting signal after passing through an ancillary counter 23 is inputted to a leveler deviation counter 24 to drive a motor 15 of a leveler 3. A pulse of the amounts of feed is inputted to the deviation counter 24 from a pulse generating circuit 26. A signal of the remaining number of counts of the circuit 26 is inputted to the ancillary counter 23. On the other hand, electricity is supplied to the motor 15 from a variable resistor 37 to drive it at a low speed. By a restarting signal 22 of the press, the motor 15 is driven again after shifting its starting time by the remaining counts of the counter 23.

Description

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

A press machine that presses in continuous operation feeds a coiled material (material) wound around an uncoiler to the required length via a level feeder in conjunction with the press operation. At that time, the coil material is leveled to remove any curls that may have formed while it was being wound into a coil.

It is fed to the press machine by a feeder. The leveler has a plurality of work rolls arranged above and below, and the material is passed between the work rolls to remove the curl.

The work roll of the leveler and the feed roll of the feeder were simultaneously rotated and stopped by the same motor to feed a fixed length of material into the press machine. Therefore, the material is stopped in the leveler feeder while being pressed by the press machine. On the other hand, the work roll of a spatula is used to flatten curled materials, so while the material is moving, it flattens the material, but when it stops, the pressure of the roll causes roll marks on the material. Attach
On the contrary, a problem occurred in that the flatness was impaired.

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

Therefore, two features of the present invention are 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. The work roll motor is rotated at an extremely low speed at the same time as the feed roll is stopped.

The embodiments shown in nine figures will be described below. FIG. 1 is an overall side view of a level 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 level feeder 3. A control circuit consisting of a coil presser 4.5, a coil opener 6, and a light emitting element 7 and a light receiving element 8.8 for controlling the amount of rewinding is not particularly different from the conventional one.

In the book feeder feeder, the level 3 and the feeder 9 are separated from each other and attached to a stand 1o. Level 3 itself is the same as before.
Cytokit roll for determining the width of material 111. Pinch roll 12. 'Foo crawl 13. It has a work roll pressure coupler 14 and a motor 15 for regulating the pressure of the work rolls. Similarly, the feeder 9 has a side guide roll 16°, a feed roll 17, and a feed roll 17.
It has a motor 18 that rotates. In this embodiment, both motors 1!5.18 are operated independently.

While operating simultaneously by the control circuit described below.

When stopped, only the motor 18 is stopped, and the motor 15 is configured to rotate at an extremely low speed.

A circuit for driving and controlling these motors is shown in FIG. The feed length setting device 19 consists of a digital switch, etc. 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 in one operation. It is intended to be sent by The value set by the feed length setting device 19 is latched in the register 21 of the creep amount setting counter 20, and the level deviation counter is sent via the auxiliary counter in response to the start signal 22 of the press machine after pressing. 24 and.

It is directly input to the deviation counter 5 of the feeder.

A pulse generator 26, 27 is attached to each of the motors 15, 18, and the output of the pulse generator 27 is directly input to the negative input of the deviation counter 5.

On the other hand, the output of the pulse generator 26 is connected to the negative input of the deviation counter via the pulse switching circuit 28.

Input to auxiliary counter %. As mentioned above, the creep amount setting counter is connected to the register 21 and the auxiliary counter n, and the value set by the feed length setting device 19 minus the value counted by the auxiliary counter n is added to the deviation counter. is input. The deviation counter 2 is configured to output a feed completion signal 29 to the pulse switching circuit when there are only a few pulses remaining.

The pulse switching circuit section includes two AND gates 3o.

31 and an inverter 32, the output of the pulse generator 26 is connected to one input of both gates, and the feed completion signal 29 and its inverted signal are applied to the other input. The output of the AND gate 31 is connected to the negative input of the deviation counter Sae, and the output of the AND gate 30 is input to the auxiliary counter n.

The output of each deviation counter 24, 25 is output from the D/A converter 3.
3.34, it is converted into an analog quantity, and amplified by amplifiers 35, 36 to rotate the motors 15 and 18i, respectively.

The drive circuit for the leveling motor 15 further includes:

A voltage application circuit for applying a bias voltage to the amplifier 35 is provided. This voltage application circuit.

The voltage generated in the sliding piece 38 of the variable resistor 37 is sent, and in response to the completion signal 29, the amplifier 351 (in addition, the motor 15 is driven by the voltage added to the output of the DIλ converter).

The operation of the above embodiment will be described below. First, consider the length of material needed for one press.

The feed length is set by the feed length setting device 19.

Auxiliary counter B does not count before the press machine operates. 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 the motor 1
5 starts rotating, the value of the feed length setter 19 is also applied to the deviation counter 5, and the motor 18 rotates.

That is, the motors 15 and 18 start rotating at the same time, and the material 1
is sent to the press machine. Feedback pulses from the pulse generators 26, 27 are then sent to the 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 given to the deviation counter U. As the motor rotates, the value set by the feed length setting device decreases, and when there are only a few pulses remaining, a feed completion signal is generated from the deviation counter Sae, and the AND gate 31 is closed and the AND gate 30'ff: opens. . Therefore, the feedback pulse from pulse generator 26 is:

Not given to the minus input side of the deviation counter 24.

An auxiliary counter is given. Since no feedback pulse is given to the deviation counter 24.

A speed command voltage of 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. When the motor 15 rotates at a 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, and the motor 15 Fully driven. 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 reaches zero in the deviation counter 5, and stops when it reaches the value supported by the feed length setting device J9.

That is, as shown in FIG. 1, the motor 15 of the level 3 is stopped at a very low speed just before feeding a predetermined amount of the material 1, and the motor 15 of the level 3 is kept at a very low speed, and when the material 1 is fed a predetermined amount from the feeder 9, the motor 15 is stopped at a very low speed. make it stop.

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

During this time, when the press machine finishes operating, the start signal 22 is again applied to the creep amount setting counter 2o, and simultaneously applied to the deviation counter 5 of the feeder 9, causing the motor 15 to start rotating. The motor 15 at level 3 is connected to the auxiliary counter 22.
Since the value counted during the stop period remains, that amount is subtracted and input to the deviation counter, and the motor 15 is rotated by the subtracted value. This slump is used to correct the slack.

When the remaining p pulses become several pulses, 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 being fed into the press and stopped.

Since the leveler continues to feed at a very low speed, the occurrence of roll marks due to the leveler's work roll can be minimized, and the flatness of the material can be maintained well.

In addition, the voltage application circuit slightly speeds up the rotation of the leveling motor at low speeds (1), so it is possible to minimize the effect on the material when shifting to low speeds, and improve the flatness of the material. can.

In other words, if the speed was suddenly lowered, 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, the flatness can be improved quickly.

[Brief explanation of the drawing]

FIG. 1 is a side view of a level feeder of a press using the present invention, and FIG. 2 is a block diagram of an embodiment of the present invention. 1...Material 13...Work roll 2...Uncoiler 15, 18...Motor 3...Level 19...Feed length setting device 9
...Feeder addition...Creep amount setting counter, 25...Deviation counter 28-・Nokuru switching circuit 26.27...Pulse generation circuit 37...Variable resistance patent applicant AIDA Engineering Co., Ltd. Representative Patent Attorney Kiyoshi Nakayama (and 1 other person)

Claims (1)

[Claims] This is a level feeder that integrates an uncoiler, leveler, and feeder to intermittently feed coiled metal sheet material to a press machine.The leveler and feeder are separated, and the leveler drive motor and feeder drive and the motor for
In the control circuit of the level feeder, which is driven separately according to the value set in the feed length setting device that sets the length of the material required for one press, the feed length is set in the drive circuit of the level drive motor. A deviation counter is installed that outputs a feed completion signal several pulses before the value set on the setting device reaches zero.
A level feeder for use in a press machine, characterized in that a voltage application circuit is provided that operates the motor with a voltage for several pulses remaining after generation of a feed completion signal and applies a bias voltage to the voltage in response to the feed completion signal. control circuit.