JPS59153768A - Sag amount control device for linear material in measured length feeder - Google Patents

Abstract

PURPOSE:To feed measured length correctly in a wire cutter and the like by obtaining the difference of linear material feeding amount between an auxiliary feeding roller and a measured length feeding roller by an encoder in a main control unit for making storage amplification to output a command speed. CONSTITUTION:Outputs from encoders 6 and 8 provided in an auxiliary feeding roller and a measured length feeding roller are inputted in a main control unit 10a to correct the difference of linear material feeding amount one by one and an auxiliary control unit 10b to correct rapidly. The main control unit 10a gives D/A conversion to both signals to obtain the difference of linear material feeding amount, which is inputted into a comparator 20 via a proportional amplifier 15, an integral amplifier 16, an inversion amplifier 18 and so on. Consequently, an output voltage V2 from an adder 24 is gradually reduced, and maintained constant as it is balanced with the output from an inversion amplifier 19. This construction permits to maintain the sag part of the linear material at a proper amount constantly, and make correct feeding of measured length by quiet operation even if there are some slips on the side of the auxiliary feeding roller.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wire rod slack amount control device in a length measurement feeder 9 device that intermittently feeds wire rods to a power wire cutting machine or the like.

Conventionally, as this type of length measuring device, for example,
There is one disclosed in Japanese Patent No. 7-43965. That is, this length measuring and feeding device 9 is provided with a pair of continuously driven pre-feed rollers that can be changed in speed between the wire supply source and the target working mechanism, and the pre-feed rollers are connected to the shaft. 2 equipped with an encoder that is intermittently driven and spaced appropriately downstream.
A wire rod slack portion is formed between these two feed rollers, and a predetermined minimum or maximum slack amount is detected in relation to this wire rod slack portion, and the preliminary feed roller is By installing a detector that generates a signal to speed up or slow down the wire for a certain period of time, a suitable amount of slack is always provided in the slack part of the wire, and the length measurement feed roller takes up the slack wire with almost no resistance while measuring the length. It is set to be sent.

However, in the case of the above-mentioned length measuring and feeding device, since the speed increase value and deceleration value are fixed, the speed increase and deceleration of the pre-feed roller are both performed rapidly.

If the speed of the pre-feed roller is rapidly increased in this manner, the wire may stretch between the roller and the wire supply reel or become wedged deep into the reel. Furthermore, if the pre-feed roller is suddenly decelerated, the wire side supply reel will over-rotate due to inertia, and the wire rod that has come out of the supply reel may become slack and tangled in the middle (71c#).

In view of the above-mentioned circumstances, the present invention provides an encoder on the pre-feed roller side as well, and sequentially inputs information regarding the wire feed amount from both encoders, and constantly outputs a speed command to the drive motor of the pre-feed roller based on this information. The speed control device consists of a main control section and an auxiliary control section. Of these, the main control section converts the input signals from both encoders into analogs, and also converts the analog value difference between the two, that is, the measurement Find the difference in the wire rod feeding amount between the long feed roller and the pre-feed roller, and output this difference without integrally amplifying it as appropriate.
In addition, the auxiliary control section integrates the input signals from both encoders individually and inputs them to the clip-flop every time a predetermined value is reached, and the output of the flip 70 knob is combined with the output of the main control section to issue a speed command to the drive motor. It is an object of the present invention to provide a wire rod slack amount control device in which the speed of the pre-feed roller is always gradually increased and gradually decreased, thereby eliminating the above-mentioned drawbacks.

A detailed description will be given below based on the embodiments shown in the drawings. 1 is a supply reel for wire rod W as a wire rod supply source, 2 is a guide roller, 3 is two groups of wire drawing rows, and 4 and 4' are pre-feed rollers consisting of a set of two rollers, which are connected to one roller 4. The motor Ml is operated continuously at a variable speed.

5 and 5' are wire drawing roller group 3 and preliminary feeding rollers 4 and 4'
One of the rollers 5 is connected to the first encoder 6, and the wire W is continuously fed by the rotation of the pre-feeding rollers 4 and 4'. Feed amount can be measured.

7 and 7' are wire rod slack sY from preliminary feeding rollers 4 and 4'
A pair of length measuring feed rollers are disposed on the downstream side of the roller 7, and are intermittently operated by a motor M2 connected to one of the rollers 7, and the roller 7 is connected to a second encoder 8 and length measurement feed rollers 7 and 7'.
It is possible to measure the amount of wire fed intermittently.

Reference numeral 9 denotes a cutting device as a working mechanism section, which has a pair of cutting blades 9a and 9b facing each other, and cuts the wire W fed by length measuring feed rows 27 and 7' through the feeding port to 7.・It operates while 7' is stopped and cuts to a predetermined size.

Reference numeral 10 denotes a speed control device for the motor M1, which sequentially corrects the difference in wire feeding amount between the preliminary feeding rollers 4 and 4' and the length measuring feeding rollers 27 and 7', as shown in the block diagram in FIG. and an auxiliary control section 10b that joins the main control section 10a every fixed feed amount on the length measuring feed rows 27 and 7' side to more quickly correct the feed amount difference. First, the main control section 10a will be explained. The Norms signals of the first and second encoders 6 and 8 are applied to the input terminals of the D/A converters 11 and 12, respectively,
The analog output signals of both D/A converters 11 and 12 are applied to the input terminal of a comparator 13. The output signal of the comparator 13 is input to a proportional amplifier 15 and an integral amplifier 16 via a comparator 14. The output signals of the two amplifiers 15 and 16 are input to an adder 170, and the output signal of the adder 17 is input to an inverting amplifier 18 and fed back to the comparator 14 via an inverting amplifier 19. The output signal of the inverting amplifier 18 is input to a comparator 20, and the output signal of the inverting amplifier 18 is input to a comparator 20.
Two inputs are obtained from the D/A converter 12 via an inverting amplifier 21 and an integrating amplifier 22. The output signal of the comparator 20 is input to an adder 24 via a proportional amplifier 23,
The output signal of the adder 24 is applied to the armature of the motor 1 as a speed command value.

Next, to explain the auxiliary control section 10b, 25.
Numerals 26 and 26 are integration counters, respectively, which input pulse signals from the first encoder 6 and second encoder 8, integrate them, and input their outputs to matching circuits 27 and 28, respectively. Reference numeral 29 denotes a count setting device which sets a count number corresponding to an arbitrarily determined constant wire rod feeding amount, and inputs its output to the coincidence circuits 27 and 28. The coincidence output signals of the coincidence circuits 27 and 28 are applied to the reset terminal R and the set input terminal S of the flip-flop 70 and the set input terminal S, respectively, and also to the reset terminals of the integration counters 25 and 26. The output signal becomes another input of the adder 24 via a proportional amplifier 31.

Next, the effect will be explained. Now, the wire rod W of the supply reel 17 is connected to the guide roller 21, the line roller group 3, between the length measuring rollers 5 and 5', between the preliminary feeding rollers 4 and 4'; and the length measuring feeding rollers 7 and 7. 1, and the slack portion Y of the wire shall be sufficiently slack as shown by the solid line in FIG. The cutting device 9 is stopped with a pair of cutting blades 9a and 9b in an open state.

The count setting device 29 also has a wire length, for example, 1, which is slightly shorter than the amount of wire initially slackened in the slack portion Y of the wire.
A count number N corresponding to m) is set in advance.

When an operation button (not shown) is pressed in this state, the motor M2 is activated and the length measuring and feeding rollers 7 begin to rotate. As a result, the wire W is fed toward the cutting device 9 while being taken off from the slack portion Y of the wire. As the length measurement feed rollers 7'' and 7' rotate, the second encoder 8 starts measuring the length and sends the generated pulse signal to the speed control device 10.This output pulse signal is transmitted to the D/A It enters the converter 1-h and is converted into a voltage value -Vl as an analog value, and this output voltage is sent to an inverting amplifier 21, an integrating amplifier 22, and a comparator 2.
The signal is sequentially amplified through a 0° proportional amplifier 23, and finally becomes one input to an adder 240. Although the output pulse signal from the second encoder 8 is also input to the integration counter 26 and integrated, the flip-flop 30 is not activated unless this count reaches the set count N. There is no input to 24. Therefore, the input from the proportional amplifier 23 to the adder 24 becomes the output of the adder 24 as it is, and this command output voltage V
.

is applied to the armature of motor M1. Since this command output voltage (2) is integrated and outputted by the integral intensifier 22, it gradually increases according to its integral constant. In this way, the motor M1 gradually increases the rotational speed from zero, rotates the preliminary feed rows 24 and 4', and feeds the wire W from the supply reel 1 toward the wire slack portion Y.

On the other hand, the length measuring rollers 5 and 5' also begin to rotate in accordance with the wire feeding operation of the preliminary feeding rows 24 and 4', and the pulse signal generated in the encoder 6 is sequentially transferred to the D/A converter 11 and the integrating roller. It is sent to the counter 25. Therefore, the output signal from the above-mentioned A/A converter 11 is combined with the output signal from the D/A converter 12 in the main control section 10a to the comparator 13.
14 and proportional amplifier 15, integral amplifier 16, adder 1
7. Since it is input to the comparator 20 via the inverting amplifier 18 etc., the output voltage v2 from the adder 24 is once gradually lowered, and the input values from the inverting amplifier 19 and the comparator 13 to the comparator 14 are balanced. By the way, the output voltage ■.

is held constant.

Thereafter, when the length measuring and feeding rows 27 and 7' finish feeding a predetermined amount of wire W, the motor M2 is stopped, and during this time the cutting device 9 is operated to cut the wire W into a predetermined size. Then, when the cutting blades 9a and 9b open, the motor M2 is driven again. The stopping time of the motor M2 depends on the length of one cycle time of the target working mechanism, but if the cutting device 9 is used only to simply cut the wire W, the stopping time of the motor M2 is extremely short; Ml is not slowed down, the rotational speed is maintained at a constant rate, and there is almost no increase or decrease in the amount of slack in the slack portion Y of the wire.

However, as the operating time of the machine increases, 6111
& Small errors due to slips of the rollers 5, 5' accumulate, and the difference in feeding amount between the two feeding rollers 4, 4'; 7, 7' gradually increases. As a result, the amount of slack in the wire slack portion Y is reduced as shown by the two-dot chain line in Figure 1.
The wire loop rises. In order to correct this, the auxiliary control section 10b operates every fixed feeding amount (1 m in this embodiment) as follows.

That is, when the count of the integration counter 26 reaches N, a coincidence signal is output from the coincidence circuit 28, and the slip-flop 3
Input to set input terminal S of 0.

This slip-flop 3 (N''j:, if the count of the other integration counter 25 has not yet reached N, it transmits an output signal and inputs it to the adder 24 via the proportional multiplier 31. The output voltage (2) of 24 increases, and the motor Ml is driven at an even higher speed.

Therefore, the wire rod loop descends rapidly due to the high speed rotation of the preliminary feeding rollers 4, 4'. When the count of the integration counter 25 reaches N, a coincidence signal is outputted from the coincidence circuit 27) and inputted to the reset terminal of the slip-flop 30, so that the seven slip-flops 30 are reset and the motor M1 returns to the original main control. Only the section 10a receives speed control.

Finally, when a stop button (not shown) is pressed to stop the machine, the motor M2 first stops and the second encoder 8 no longer outputs a pulse signal, so that from then on, the pulse signal is transmitted from the integrating amplifier 22 to the comparator 20. The input gradually decreases according to the constant of integration and eventually reaches zero.

Therefore, since the output voltage V2 from the adder 24 also gradually decreases, the drive of the motor M1 also gradually slows down and stops.

Incidentally, if the working time in the target working mechanism section is long and the stopping time of the motor M2 is long, the motor M1 gradually decelerates and stops, and gradually increases the speed as the motor M2 is driven again. That is, when the intermittent stop time of the motor M2 is long, the motor M1 is also substantially driven intermittently.

Specifically, when using the wire rod slack amount control device of the present invention as described in detail above, the speed control device for the drive motor of the preliminary feeding roller is divided into a main control section and an auxiliary control section, and the main control section has two
The wire feeding amount difference between the pre-feed roller and length-measuring feed roller is determined by sequentially inputting data from two encoders, and this difference is integrated and amplified to output the command speed, so the response speed is relatively slow and the drive speed is relatively slow. The speed of the motor increases and decreases gradually9, preventing sudden tension on the wire upstream of the pre-feed roller and over-rotation of the supply reel, and the auxiliary control unit automatically increases and decelerates the wire at regular feed rate intervals. We checked to see if there was a difference in quantity, and if there was a difference, the command speed was increased further to the main control unit to make the difference zero, so even if there was some slip on the pre-feed roller side, the slack part of the wire would be eliminated. An appropriate amount of slack can be maintained at all times, and accurate length measurement feeding 9 can be performed with quiet operation.

[Brief explanation of the drawing]

FIG. 1 is an overall schematic diagram of the length measuring and feeding device, and FIG. 2 is a control block diagram of the speed control device. In the figure, 4 and 4' are preliminary feeding rollers, 6 is a first encoder, 7 and 7' are length measurement feeding rollers, 8 is a second encoder, and 1
0 is a speed control device, 10a is a main control section, iob is an auxiliary control section, W is a wire rod, Y is a slack portion of the wire rod, and Ml and M2 are motors. Applicant's agent Takashi Higashi

Claims (1)

[Claims] (1) Between the wire supply source and the target working mechanism section, a set of variable-speed pre-feed rollers and a long-feed roller that is driven intermittently are placed upstream and downstream via the wire slack portion, respectively. The preliminary feeding roller feeds the wire toward the slack portion of the wire, and the length measuring feed roller takes up the wire at the slack portion of the wire and intermittently feeds the wire toward the wire processing section while measuring the length. In the long feed device, an encoder is provided in relation to the preliminary feed roller and the length measurement feed roller, and information regarding the wire feed amount from both encoders is inputted to control the speed of the drive motor of the preliminary feed roller. A speed control device that outputs commands is provided, and the speed control device consists of a main control section and an auxiliary control section, and the main control section is a D/A converter that sequentially converts input signals from each degree encoder into analog signals. a comparator that takes the difference between the output values of both the D/A converters, an amplifier group including an integrating amplifier that amplifies the output value of the comparator, and an adder that inputs the output of the amplifier group. The auxiliary control section also includes an integration counter that sequentially integrates input signals from each of the encoders, and a flip-flop that inputs a set signal or a reset signal when the contents of each integration counter reach a predetermined value. Line slack amount control in a length measurement feeder, characterized in that the output of the flip-flop is input to the adder, and the output of the adder is used as a command output to the drive motor. Device.