JPS6065151A - Controller of weft yarn feeder - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a weft yarn feeding device, and more particularly to a control device for continuously rotating a flyer thereof.

A weft feed device is used in the rapier loom and jet loom. This weft yarn feeding device has a function of winding the weft yarn around the outer periphery of the drum using a flyer and storing the weft yarn necessary for weft insertion.

Conventional fryers rotate intermittently, combining high-speed rotation and stops. In other words, the thread on the drum runs out (then the fryer rotates at high speed,
It accumulates the required amount of weft yarn on the drum, but then stops and waits for the next revolution.

However, with such discontinuous rotation, when the yarn is wefted in a rapier loom or jet loom, vibrations occur when the yarn is stopped, making it impossible to achieve desirable wefting.

Therefore, an object of the present invention is to rotate the fryer continuously at low speed, to prevent the occurrence of stretching of the twine, and to stabilize weft insertion.

Based on the above object, the present invention rotates a flyer at the basic speed of a variable speed motor, detects the amount of yarn remaining on the drum at a certain timing during weaving, and responds to the above variable speed in response to the excess or deficiency. The rotational speed of the motor is corrected so that the fryer is continuously rotated within a certain target value range.

Hereinafter, one embodiment of the present invention will be specifically described based on the drawings.

First, FIG. 1 shows a weft feed device 1 and a control device 2 of the present invention, which are the premise of the present invention. The weft feed device 1 includes a drum 3 in a stopped state and a flyer 5 that winds the weft 4 around the outer peripheral surface of the drum 3. This flyer 5 rotates around the axis of the drum 3, draws out the weft thread 4 inside, and sequentially wraps the weft thread 4 around the outer peripheral surface of the drum 3 at its tip (.

The fryer 5 is driven by a variable speed motor 6. This variable speed motor 6 is placed under the control of a drive amplifier 7.

A basic speed setting device 8 and a correction signal generation circuit 9 as the main parts of the control device 2 are connected to the input side of the drive amplifier 7.
is connected. That is, the basic speed setting device 8 is constituted by a variable resistor, etc., and is connected to the input terminal of the drive amplifier 7 via the operation contact 11 and the summing points 13a and 13b. Further, the correction signal generation circuit 9 is similarly connected to the drive amplifier 7 via the operation contact 12 and the addition points 13a and 13b. This correction signal generation circuit 9 is connected to the output end side of a sensor 10 for detecting the amount of remaining yarn and a timing signal generation circuit 14. This timing signal generating circuit 14 is connected to a proximity switch 15 in order to detect the rotation angle of the main shaft 16 of the loom.

Note that a tacho generator 17 is connected to the variable speed motor 6, and its output is applied to the addition point 13b as a feedback signal.

Next, FIG. 2 shows a specific example of the correction signal generation circuit 9. The remaining yarn amount signal Sa and the timing signal St pass through the input gate 18 and become input signals of the sample hold circuit 19, and the output thereof, together with the output of the target setter 20, passes through the addition point 26 and is input by the PID type node amplifier 21. This becomes the correction signal Vc.

Further, FIG. 3 shows the timing signal generation circuit 14. As shown in FIG. A clear terminal of the ring counter 22 is connected to a reset switch 24, and a precent terminal is connected to a setter 23.

The output signal Cp of the proximity switch 15 becomes the input terminal of the ring counter 22 and one input of the AND gate 25, and the output of the ring counter 22 is connected to the other input terminal of the AND gate 25. The output of this AND gate 25 becomes a timing signal St and is input to the correction signal generation circuit 9.

Next, the operation of the control device 2 will be explained. The basic speed setting device 8 generates a basic speed command signal vO determined by the rotational speed of the loom and the weaving width, and sends this to the input side of the drive amplifier 7 via the operating contact 11 which is in an on state during operation. Here, the drive amplifier 7 controls the rotation of the variable speed motor 6 based on the basic speed command, and gives the fryer 5 rotation at the basic speed. The rotational speed of the variable speed motor 6 is negatively fed back to the addition point 13b as a feedback signal by the tacho generator 17, so the variable speed motor 6 maintains the set target rotational speed under feedback control. .

As already mentioned, if only this basic speed control system is used, excess or deficiency will occur in the actual yarn storage amount, and weft insertion will not be performed smoothly. Therefore, the sensor 10 detects the amount of yarn remaining on the circumferential surface of the drum 3 in an analog manner, generates a remaining yarn amount signal Sa proportional to the detected amount, and sends this to the correction signal generation circuit 9. Here, the correction signal generating circuit 9 generates a signal 1 determined by the number of repeats determined by the texture of the woven fabric and a certain crank angle of the loom.
At a certain timing during rotation, that is, timing signal St
In response, the remaining thread amount signal Sa is sampled by the sample and hold circuit 19, and the remaining yarn amount signal Sa is sampled by the sample and hold circuit 19,
After that, a correction signal VC is generated. The above repeat number is
It is set by the setting device 23. When the loom reaches a certain rotation angle, the proximity switch 15 generates a signal Cp, which is sent to one input terminal of the AND gate 25 and the input terminal of the ring counter 22.
When the set number of repeats is reached, a timing signal St is generated. On the other hand, during the sampling period of the remaining thread amount signal Sa, the input gate 18 is open, and the same voltage change as the analog input appears at both ends of the capacitor. When the hold mode is entered, the input gate 18 is closed and the voltage across the capacitor 27 becomes high impedance, so the voltage immediately before the hold is continued to be held. In this way, the sample and hold voltage, that is, the correction signal Vc is obtained. This correction signal Vc passes through addition points 13a and 13b and is input to the drive amplifier 70, so that
This drive amplifier 7 has a basic speed signal vO and a correction signal Vc.
The rotational speed of the variable speed motor 6 is determined by the sum of the values. This timing signal generation circuit 9 is connected to the drum 3.
This is necessary due to the variation in the amount of yarn stored in the weft yarn 4 on the circumferential surface of the weft yarn 4.

That is, generally, the weft thread 4 is accumulated on the circumferential surface of the drum 3 when it is not the weft insertion period, and the weft thread 4 is suddenly pulled out when the weft insertion starts. This is because if such a change in the amount of stored yarn is directly used as the analog remaining yarn signal Sa, the above-mentioned fluctuation will become larger as the rotational fluctuation of the flyer 5 becomes larger. With the control system described above, the fryer 5 does not stop,
Control that allows continuous rotation is possible.

In the present invention, the flyer rotates continuously, and the weft yarn is drawn out continuously without being unwound intermittently, so that the weft yarn does not sag when the flyer stops, which is the case in the past. This makes it possible to easily control the weft thread tension and achieve stable and ideal weft insertion. In addition to twine, the same effect can also be obtained with yarn or flat yarn with a large mass.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a control device for a weft thread feeding device according to the present invention, FIG. 2 is a block diagram of a correction signal generation circuit, and FIG. 3 is a block diagram of a timing signal generation circuit. 1. Weft feed device, 2. Control device, 3. Drum, 4. Weft, 5. Flyer, 6. Variable speed motor, 7. Drive amplifier, 8. Basic speed setting device, 9
・・Correction signal generation circuit, 1°・・Sensor, 14・・Timing signal generation circuit, 15・・Proximity switch, 19・
・Sample hold circuit. Figure 7 Noah＼ Figure 2

Claims (1)

[Claims] In a feeding device that collects the necessary weft yarn on the outer circumferential surface of a stationary drum by rotating a fryer, a variable speed motor that rotates the fryer, a drive amplification circuit for this variable speed motor, and a drive amplification circuit for this drive amplification circuit are connected to the basics of the fryer. A basic speed setting device that provides a basic speed signal corresponding to the speed, a sensor that detects the amount of yarn remaining on the drum and generates a remaining yarn amount signal, and a timing signal that is synchronized with the rotation of the loom and generates a timing signal at a certain timing. A control device for a weft thread feeding device, comprising a timing signal generation circuit and a correction signal generation circuit that determines excess or deficiency of weft from the amount of remaining thread and applies a correction signal to the drive amplifier circuit.