JPS63101279A - Controller of bobbin winder for net making machine - Google Patents

Abstract

PURPOSE:To keep yarn tension constant as well as to prevent any yarn winding failure from occurring, by setting the yarn tension to almost constant at time of a winding start and its end and, at the midway of winding, controlling rotation of a bobbin so as to keep a yarn speed constant. CONSTITUTION:When a motor for starting the winding of yarn is started, a speed command signal out of the motor 6 is increased by constant value at a time, controlling rotational frequency of the motor 6 so as to be gradually railed up, and when a yarn speed is reached to the preset value, it enters a yarn speed constant control, whereby the rotational frequency of the motor 6 is controlled so as to become the setting value. And, when a bobbin 5 is reached to a spiral covered state or the winding length setting value, a motor controlling speed command signal is decreased by the constant value at a time, stopping the motor as gradually decelerating it. Therefore, during winding operation of yarn, yarn tension is able to keep it constant, so that the yarn is favorably windable on the bobbin 5 without entailing any winding failure or the like in the yarn.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a control device for a bobbin winder that winds yarn onto a bobbin for a net making machine.

<Prior Art> A bobbin called a bunsen is housed in the shirttle of a net making machine, and the weft thread of the net to be made is pulled out from this bobbin.

This type of bobbin is shaped like a thin pulley, and a winding machine that winds yarn onto such a bobbin has a turntable attached to a spindle that is rotationally driven by a motor. The structure is such that the yarn being hemmed from the winder is guided to the bobbin, and the bobbin is driven to rotate to wind the yarn. (Problem to be solved by the invention) However, the motor used in the conventional winding machine of this type is Since only constant speed rotation is performed and no speed control is performed, the rotationally driven bobbin starts rotating rapidly at startup, then rotates at a constant speed, and when winding is complete, the motor is turned off and the motor rapidly decelerates to a stop. be done. Therefore, at the beginning of winding, the bobbin is rapidly accelerated, increasing thread tension and causing the thread to unwind, and at the end of winding, the bobbin rapidly decelerates, causing almost no thread tension. There was a problem that it was not possible to wind it up properly. Also, since the diameter of the bobbin is large relative to its thickness, when the bobbin is rotated at a constant speed, the larger the winding diameter of the thread, the more the winding amount per unit time and the thread speed. There was a problem in that the thread tension changed, causing the thread to unwind on the bobbin, causing the bobbin to be pushed from the inside and swell, resulting in the bobbin being thicker than the normal thickness.

Means for Solving the Problems> The present invention has been made to solve the above problems, and it is possible to control the thread tension to be almost constant at the beginning and end of winding, and , Control of a bobbin winder for a net making machine that can keep the thread tension constant and prevent the thread from unwinding by controlling the rotation of the bobbin so that the thread speed is constant in the middle part of the winding. The device is configured as follows.

That is, as shown in the block diagram of FIG. 1, the control device for the winding machine of the present invention drives a bobbin for a net making machine by a motor 6, and winds the thread unwound from cheese onto the bobbin 5. In the control device of the machine bobbin winder, a yarn speed sensor 12 that detects the yarn speed and a pulse signal output from the yarn speed sensor 12 according to the yarn speed when the motor is started are inputted.
Count the number of pulses of the < When the number reaches a preset value, the soft start control means 30 shifts to the next control, inputs a pulse signal corresponding to the yarn speed, counts the number of pulses per a certain period of time, and Yarn speed constant gain means 40 outputs a speed command signal for motor control so that the number of pulses per hit becomes a preset value, and a bobbin 5
A vortex detector 19 detects the vortex state of the yarn winding amount and outputs a vortex signal, and when the vortex signal is output from the vortex detector 19 or the yarn winding length reaches a set value, the motor is activated at regular intervals. The motor is configured to include a soft-down stop control means 50 that decreases a speed command signal for control by a constant value, gradually slows down the motor speed, and stops the motor.

Therefore, when starting the motor to start winding the yarn, the motor speed command signal is increased by a fixed value to gradually increase the motor rotation speed, and when the yarn speed reaches a preset value, the yarn speed A constant gain is entered, and the rotational speed of the motor is controlled so that the yarn speed becomes the set value. Then, when the bobbin reaches a full winding state or a winding length setting value, the speed command signal for motor control is decreased by a constant value, and the motor speed is gradually decelerated and stopped. Therefore, during the thread winding operation, the tension of the thread can be kept almost constant, and the thread can be smoothly wound around the bobbin without the thread being unwound.

<Example> Embodiments of the present invention will be described below based on the drawings.

FIG. 2 shows a right side view of a bobbin winder for a net making machine, and a circular turntable 2 is provided on a base 1. FIG. A spindle 3 is provided in the center of the turntable 2 so as to penetrate from inside the base 1 and protrude, and a turntable 4 is fitted onto the upper part of the spindle 3.

The spindle 3 is rotatably supported within the base 1 and linked to the motor 6 via a pulley and a belt.

An encoder is attached to the motor 6 to output a pulse signal of a frequency corresponding to the rotation speed of the motor 6, and the return speed of the motor 6 is precisely controlled by a motor control circuit to be described later. As shown in Fig. 3, a large diameter hole is drilled in the center of the coin 5, and four small holes are bored around the large diameter hole.
Since the tip of the spindle 3 protrudes above the turntable 4 and the pin is protruded at a predetermined position, the pobbin 5 is correctly fitted onto the turntable 4.

A stand 7 is erected on the base l, and a cheese support part 9 that rotatably supports the cheese 8 is provided at the top of the stand 7. A brake device lO for applying the brakes is installed, and this brake device is operated by a solenoid. A yarn speed sensor 12 using a pulley 11 is provided below the cheese support portion 9, and this yarn speed sensor is constructed by providing a metal protrusion on the pulley 11 and providing a proximity switch opposite to the protrusion. When the yarn is hooked, the pulley 11 rotates according to the yarn speed, and a pulse signal having a frequency corresponding to the rotational speed of the pulley 11 is output from the proximity switch, that is, the yarn speed sensor 12. A thread breakage detector 13 using a microswitch is provided below the thread speed sensor 12. When the thread is running normally, the lever of the microswitch is supported by the thread, and if the thread breaks, the lever will not move. It has a structure that returns and outputs a thread breakage signal.

A swing arm 14 is attached to a stand below the thread breakage detector 13 so as to be able to swing vertically.
A pulley 15 is pivotally supported at the tip of 4. This pulley 15
increases as the tension of the thread increases, and decreases as the tension decreases. Therefore, the deceleration brake mechanism 16 provided on the cheese support section 9 is operated in accordance with the swinging of the swing arm 14, and the thread from the cheese 8 is reduced. Adjust the pulling force to keep the thread tension constant. Further, a traverse lever 17 is supported on the base 1 so as to be rotatable on a plane, and two pulleys 1 are mounted on the traverse lever 17.
8 is pivotally supported, and the thread coming from above is hung on this pulley 18 and then enters the pobbin 5 on the turntable 4. Therefore, the driver thread /<-17 moves in accordance with the winding position of the thread on the pobbin 5, and when the pobbin 5 enters a spiral state, the traverse lever 17 moves to the outermost position.
At this time, a vortex detector (for example, a limit switch) 19 that outputs a vortex signal is provided on the shaft portion of the traverse lever 17. Note that the traverse lever 17 has a structure that is moved up and down by a cam (not shown), and thereby moves a pulley 18 for guiding the thread up and down to swing the thread.

Next, the control device for the winding machine will be explained with reference to the block diagram shown in FIG. 4.

The main part of this control device is composed of a microcomputer, and includes a CPU 21 that executes soft start control, constant yarn speed control, soft down stop control, etc. of the motor 6 based on predetermined program data, and a CPU 21 that executes program data, etc. ROM 22, which is a read-only memory that stores fixed data. RAM that can be read and written at any time
23. It includes an input/output circuit 25 that inputs and outputs data. The CPU 21, ROM 22, and other units are interconnected by a bus 24, and the input/output circuit 25 is connected to a numeric keypad 27 for setting yarn speed settings, one-winding length settings, etc., and numerically displays the set values. A display 26 is connected. Furthermore, the input/output circuit 25 includes the above-mentioned vortex detector 19. Thread breakage detector 13. In addition to the yarn speed sensor 12, an emergency stop switch 28. A motor control circuit 29 is connected. The motor control circuit 29 is connected to the input/output circuit 2 from the CPU 21.
A speed command signal (for example, a voltage signal of 0 to 255 steps) is input through the motor 5, and the firing angle of the electric power supplied to the motor is controlled by a thyristor in accordance with this speed command signal. The input/output circuit 25 includes a circuit for shaping the waveform of the signal sent from the yarn speed sensor 12, and the like.

Next, the operation of the control device for the winding machine having the above configuration will be explained based on the flowcharts shown in FIGS. 5 to 7.

First, to prepare for operation, feed the yarn to the winder and input the setting values using the numeric keypad.As shown in Figure 2, the yarn is fed by first swinging the yarn pulled out from the upper cheese 8. The yarn speed sensor 12 is hooked onto the pulley 15 of the arm 14.
The thread is first passed through the thread breakage detector 13 and then onto the pulley 18 of the lower traverse lever 17, and then the tip of the thread is hooked onto the pobbin 5 on the turntable 4.

Input the setting values: the set winding length (which can be determined arbitrarily depending on the thread diameter and bobbin diameter), which determines the length of the thread to be wound on the pobbin, and the thread speed, which determines the running speed of the thread during constant thread speed control. , a soft start slope value that determines the slope of speed increase during soft start, and a soft down slope value that determines the slope of deceleration during soft down are input using the numeric keypad 27, and each value is set to R.
0 stored in AM23 For example, set the yarn speed setting to 500m.
/zenin, the set value N of the number of pulses per second output from the yarn speed sensor 12 is N=500mX4
It becomes about 33 from the formula of +60 seconds. Further, the step increase value A of the speed command signal at the time of soft start is determined by the soft start slope value, and the step decrease value B of the speed command signal at the time of soft down is determined by the soft down slope value.

Each of B is stored in the RAM 23.

When the power of the motor 6 is turned on and the rotation of the pot bin 5 is started, the CPU 21 executes the soft start control shown in FIG. After setting the values of Next, in step 120, 1 is added to the pulse count value (count value of yarn winding length) n. Note that when passing through this step for the first time, n is O, so n = 1. If no pulse signal is input, step 120 is skipped and the process proceeds to step 130, and the timer count value is the unit of control. It is determined whether the time (for example, 1 second) has elapsed, and if 1 second has not elapsed, the process jumps to step 170 and the emergency stop switch 28 is turned on, or the emergency stop is triggered by the signal output from the thread breakage detector 13. It is determined whether or not the motor has been activated, and if it is determined that an emergency stop has occurred, the process jumps to step 350 of motor stop processing in FIG. 7, and if there is no emergency stop state, the process returns to step 110. Then, steps 110-1
30 and step 170 are repeated, and the pulse count value n (corresponding to the winding length of the yarn) is added.

When the count value of the timer reaches 1 second, step 130
Proceeding to step 140, the difference between the set value N and the count value (n-no) of the pulses counted for one second this time is determined, and the value of N - (n-no) (no is the count value up to the previous time) is determined. If it is larger than 0, then the process proceeds to step 150, where the step increase value A is added to the speed command signal S for motor control. Next, in step 160, the current n is set to no, the timer is reset, and then the process returns to step 110 via step 170. And step 110~
By repeatedly executing step 170, the speed command signal S increases by the step increase value A every second, and the rotational speed of the motor 6 gradually increases as shown in FIG.

Then, when the number of pulses per second (n-no) output from the yarn speed sensor 12 exceeds the set value N, step 14
The process proceeds from step 0 to step 180, where the timer is reset to the count value n1no, and then the process proceeds to the constant yarn speed control shown in FIG.

When entering this constant yarn speed control, first in step 200, it is determined whether or not a pulse signal from the yarn speed sensor 12 has been input, as described above, and if it has been input, the next step 2
10, 1 is added to the pulse count value n. and,
In step 220, it is determined whether the count value of the timer has reached, for example, 1 second. If it has not reached 1 second, the process proceeds to step 270, in which the emergency stop switch is turned on or the thread breakage detector 13 is turned on. It is determined whether an emergency stop has been applied based on the signal output, and if there is no emergency stop, the process proceeds to step 280, where the yarn winding length is set in advance based on the count value n of the pulse signal. It is determined whether the set winding length has been reached, and if the set winding length has not been reached, the process returns to step 200 again.

Step 200 until the timer count value reaches 1 second.
~220. Steps 270 to 280 are repeatedly executed, the count value n of the pulse signal is added up, and when the count value of the timer reaches 1 second, step 220
The process then proceeds to step 230, where the difference between the set value N and the count value (n-no) of the pulses counted for one second this time is determined, and if the difference is 0, the motor speed command signal S is left unchanged. As a state, the process proceeds to step 260, and when the difference is smaller than 0, that is, when the pulse count value n per second (the yarn winding length) is large, the speed command signal S is
Subtract 1 from. As a result, the speed of the motor 6 is controlled to be reduced by one step. Also, when the difference between the set value N and the count value (n-no) is larger than O, that is, when the pulse count value n per second is smaller than the set value N, 1 is added to the speed command signal S, and thereby The speed of the motor 6 is increased by l steps.

Next, in step 260, the current count value n is set to no.
and reset the timer, and step 27
0 and 280 as above and again step 200
Steps 200 to 220 and 270 to 280 are repeated until the count value of the timer reaches 1 second.

After 1 second has elapsed, in step 230, the count value (n-n
o) is determined, and the value of the speed command signal S is increased or decreased by one step in accordance with the difference.

In this way, by repeatedly executing steps 200 to 280, if the count value (n-no) of pulses from the yarn speed sensor 12 per unit time, that is, the yarn speed becomes larger than the set value N, deceleration control is performed. When the yarn speed becomes smaller than the set value N, the speed of the motor 6 is controlled to increase the speed to keep the yarn speed constant. The winding diameter of the bobbin 5 becomes thicker as the thread is wound, so
As shown in FIG. 8, the motor rotation speed during constant yarn speed control gradually decreases.

On the other hand, if the thread breaks during operation or the emergency stop switch 2
8 is turned on, the process proceeds from step 270 to step 350 in FIG. 7, where the motor is turned off and the brake device 10 is activated to stop the cheese 8.

On the other hand, when the thread is wound onto the bobbin 5 while keeping the thread speed constant and the winding length (pulse count value n) of the thread reaches the preset winding length, or when When the signal is output and the winding is full, the soft down stop control shown in FIG. 7 is entered from step 280.

When entering the soft down stop control, first, in step 300, the step reduction value B is subtracted from the speed command signal S, and in step 310, it is determined whether the count value of the timer has reached 1 second. If the time has not reached 1 second, the process proceeds to step 340, and it is determined whether the value of the speed command signal S is less than or equal to O, and if it is not less than O, the process returns to step 310.
When the timer value reaches 1 second, steps 310 to 320
, subtract the step reduction value B from the speed command signal S,
At step 330, the timer is reset. and,
By returning from step 340 to step 310 again and repeating steps 310 to 340, the speed command signal S is subtracted by the step reduction value B every second, and the remoter 6 is thereby gradually decelerated and soft Down control is performed. When the speed command signal S becomes equal to or less than O, the process proceeds from step 340 to step 350, where the motor is turned off and stopped, and the cheese 8 is braked to finish winding the thread.

In the above embodiment, the timer was set to 1 second, and the motor speed command value was increased or decreased every second. However, if this time is shortened to, for example, 500 ssec or 100 m5ec, finer control can be performed.

<Effects of the Invention> As explained above, according to the control device for a bobbin winder for a net making machine of the present invention, it is possible to perform soft start control and soft down control of the motor that rotates the bobbin. At the beginning, the bobbin is not accelerated rapidly to increase the thread tension, and at the end of winding, the bobbin is not rapidly decelerated and the thread tension is not excessively relaxed.

In addition, since the motor is controlled so that the thread speed is always constant in the middle part of the winding, the bobbin can be wound while keeping the thread tension almost constant. Therefore, the yarn can be wound well.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of the present invention, Figs. 2 to 8 show embodiments of the present invention, Fig. 2 is a right side view of the winding machine, and Fig. 3 is a view of the turntable section of the winding machine. Perspective view. Figure 4 is a block diagram of the control device, Figures 5, 6, and 7.
The figure is a flowchart showing the operation of the device. FIG. 8 is a graph showing changes in motor rotation speed. 5... Bobbin, 6... Motor, 12... Yarn speed sensor, 19... Vortex detector, 30... Soft start control device, 40... Yarn speed constant control means. 50... Soft down control means. 50... Soft down control means! 12 Figure f44 Figure 8 Figure 8 Saikai- Figure 5 Figure 6

Claims (1)

[Scope of Claim] In a control device for a bobbin winding machine for a net making machine that drives a bobbin for a net making machine by a motor and winds yarn unwound from cheese onto the bobbin, a yarn speed sensor that detects the speed of the yarn. When the motor is started, a pulse signal outputted from the yarn speed sensor according to the yarn speed is input, the number of pulses of the pulse signal is counted per a certain period of time, and the number of pulses for motor control is inputted at each certain period of time. a soft start control means for increasing the rotation speed of the motor by increasing the speed command signal by a constant value, and shifting to the next control when the number of pulses per constant time reaches a preset value; Yarn speed that inputs a corresponding pulse signal, counts the number of pulses per certain period of time, and outputs a speed command signal for motor control so that the number of pulses per certain period becomes a preset value. a constant control means; a vortex detector that detects the vortex state of the amount of thread wound on the bobbin and outputs a vortex signal; and when the vortex signal is output from the vortex detector or the winding length of the thread reaches a set value; A bobbin for a net making machine, comprising: a soft-down stop control means that decreases a speed command signal for motor control by a fixed value at fixed time intervals, gradually slows down the motor speed, and then stops the motor. Winder control device.