JPS61296146A - Method and apparatus for controlling electromotive feed-out of loom - 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 Technical Field of the Invention The present invention relates to, for example, a loom with a pink finder function, and more particularly to an electric feed-out control method and device effective for preventing stoppages.

BACKGROUND OF THE INVENTION A pink finder is attached to a loom from the viewpoint of shortening stoppage time and improving operability.

This pick finder rotates the loom in reverse when the loom is stopped due to poor weft insertion, and brings the front of the weave corresponding to the defective weft insertion into a leading state. Such a pick finder function allows the weft repair work to be performed efficiently.

By the way, in order to save labor in this type of work and prevent misalignment, efforts are being made to automate the pink finder function and the weft repair work.

However, a problem has arisen between this improvement in operability and the improvement in fabric quality. That is, improvement in operability, that is, removal of defective yarns, can be performed immediately if the warp yarns are in an open state. However, when the opening is large, high tension is continuously applied to the warp yarns during the stoppage period, so if the repair work of the weft yarns is delayed, the warp yarns will stretch and a stop will occur in the fabric when the weaving is restarted.

Therefore, at present, even at the weft stop, the warp threads remain closed and the weaver waits for the weaver. Therefore, when repairing the weft yarn, the weaver first reverses the loom to open the front of the defective weft insertion area, and then pulls out the defective yarn.

Under these circumstances, in order to automate the pink finder function, it is desired to be able to stop the pink finder in an open state without adversely affecting the quality of the fabric.

These requirements are met by the loom's pink finder function, which stops the warp yarns in an open state when there is a weft insertion failure, and also loosens the tension on the warp yarns when the loom is stopped, that is, when waiting for the weft yarns to be repaired. This problem can be solved by preventing elongation and thereby movement of the front, and by restoring the warp threads to normal tension when restarting the loom after repair before entering the operating state. Such a solution is described in, for example, Japanese Patent Publication No. 36-4029 or Japanese Patent Application Laid-Open No. 51-157355.

By the way, the target tension of the warp threads during weaving is always set to a constant value. However, the actual tension is determined by the main movements of the LA machine, such as the opening movement and the hammering movement.
It changes pulsatingly during one revolution of the loom. For this reason, actual normal weaving is performed under pulsating changes in the warp tension centered around the target value. Therefore, even when the loom is restarted after stopping, if the warp tension is faithfully set to the target tension value, the control state will not take into account the main motion of the loom, and will be unrealistic. This is a tension value and will be unnatural.

This, in turn, causes the occurrence of stoppages.

Therefore, it is an object of the invention to set the warp thread tension not exactly to the target tension when restarting the loom, but by setting it to the corresponding tension during actual weaving at that startup rotation angle. The purpose is to set conditions similar to actual tension fluctuations even at the initial stage of startup of the machine, and to prevent the occurrence of stoppages.

SUMMARY OF THE INVENTION Therefore, the present invention provides for
Pulsating fluctuations in warp tension during one or several revolutions of the loom are stored in memory, and after the loom stops,
After loosening the warp tension and repairing the weft threads in this state, when restarting the loom, the actual tension value during weaving operation corresponding to the starting rotation angle is read from the memory.
After controlling the warp thread tension based on the tension value, the loom can be started. Therefore, even at the initial stage of starting up the loom, the tension of the warp threads is set to approximately the same value as during actual weaving, and changes in a pulsating manner based on the subsequent main movement, as in the case of steady operation.

In this way, even if the warp thread tension is temporarily loosened while the loom is stopped, the warp thread tension will be set to almost the same value as during normal weaving when the loom is restarted, so the weft tension will be reduced. Even if the loom temporarily stops due to a mistake, the stop step will not occur due to elongation of the warp threads during the stop period, movement of the weaving front, etc.

Structure of the Invention First, FIG. 1 shows an outline of an electric weaving machine 1 for a loom, which is the premise of the present invention. The warp thread 2 to be controlled is
It is wrapped around the delivery beam 3 in the form of a sheet, passed through the tension roll 4, and then opened by the belt 5 into the opening 6.
While forming the woven fabric 8, the woven fabric intertwines with the weft 7 and becomes the woven fabric 8. Then, this woven fabric 8 passes through a presto beam 9, a pick-up roll 10, and a press roll 11, and is wound around the outer periphery of a winding beam 12.

On the other hand, the actual tension of the warp threads 2 is indirectly detected by a tension detector 13 such as a load cell installed between the axis of the tension roll 4 and the fixed frame 14, and is detected as an electrical tension signal A. , is output to the delivery control device 15 of the present invention.

The feed control device 15 controls the amount of rotation of the feed motor 16 based on the tension signal A. Note that the rotation of this delivery motor 16 is transmitted to the delivery beam 3 via a gear 17.

The main motion of the loom is also provided by a drive motor 18. This drive motor 18 is under the control of a loom control device 19. When this loom control device 19 receives an operation permission signal from the sending-off control device 15, it starts the driving motor 18 and also sends an operation signal B and a weft stop signal C to the sending-off control device 15.

The loom control device 19 has a big finder function, and when it detects a weft insertion defect, it automatically stops the next weft insertion movement, and after stopping the loom, the drive motor 18 is rotated in the opposite direction to open the weaving area corresponding to the defective weft insertion, and wait in this state.

Next, FIG. 2 shows a specific example of the delivery control device 15 of the present invention.

The tension setting device 20 during steady operation includes a adding point 21, a PID type controller 22 for steady operation, and an operation permission timer 36.
contact 36b1 summing point 25, and drive amplifier 2
6 to the feed motor 16. A tacho generator 27 is connected to this delivery motor 16, and its output is fed back to the summing point 25 as a speed feedback signal.

On the other hand, the stop tension setting device 28 is used at the addition point 2 to set a lower warp tension when the loom is stopped than during weaving.
9, the stop controller 30, and the relay contact 24a of the stop relay 24, and are connected before the summing point 25. The tension detector 13 is branched on the output side and connected to the summing point 21 via an averaging circuit 31 and directly to the summing point 29.

Further, the tension detector 13 directly connects the addition point 38,
Preparation PID type controller 39, relay contact 23 a %
36c before the summing point 25. On the other hand, the tension detector 13 further branches to A/
D converter 40, memory 37, arithmetic control device 41 and D
It is connected to the summing point 38 via the /A converter 42.

On the other hand, the encoder 44 connected to the main shaft 43 of the ms
It is connected to the address input terminal of the memory 37 by a decoder 45 . Note that this encoder 44 is also connected to a write input terminal of the memory 37 via one input terminal of a one-shot multivibrator 46 and an AND gate 47.

The other input terminal of this AND gate 47 is connected to ground 49 by relay contact 36g and inverting amplifier 48.
It is connected to the.

The input terminal 50 for the timing signal M at a rotation angle of 0 degrees of the loom is connected to a one-shot multivibrator 51, an AND gate 52 connected at one end to ground 49 by an inverting amplifier 53 and a timer contact 36f, and an n-ary counter 54. , and a decoder 45 via a switching timer contact 36d.

Further, the relay contact 23c and the relay contact 36e are connected in series, connected to ground 49, and connected to one input end of the arithmetic control unit 41 and AND gate 56 via an inverting amplifier 57. There is. The AND gate 56 is connected to the oscillator 55 at the other input end, and connected to the amplifier input end of the n-ary counter 58, the read input end of the memo I 737, and the arithmetic control unit 41 at the output side. And this counter 58 is
On the reset input side, it is connected to ground 49 by an inverting amplifier 59 and relay contact 23d, and on the output side, it is connected to one terminal of the switching contact 36d and the input end of the arithmetic and control unit 41.

FIG. 3 shows a control circuit 32 for sequential operation. This control circuit 32 is installed inside or outside the control device 15.

The operation relay 23 is connected in series with a pair of power supply terminals 34 together with the operation contact 33, and the stop relay 24 is connected to the side stop contact 35 and the operation relay 2.
It is connected in series to the power supply terminal 34 together with the normally closed contact 23b of No. 3.

In addition, for the operation relay 23, an operation permission timer 36
are connected in parallel. The operation permission timer 36 closes the timer contact 36a after a certain delay time T from the time the operation contact 33 closes.
Generates the above operation permission signal.

Function of the Embodiment Next, the function of the present invention will be explained together with the operation of the delivery control device 15 with reference to FIGS. 4 and 5.

For convenience of explanation, the following description will be made on the assumption that the loom has already entered a steady operating state and the normal weaving operation is continuing.

In this state, the feed-out control device 15 is generating an operation permission signal of "1", so the loom control device 19 rotates the drive motor 18 to
It continues the movements necessary for weaving.

During this operation, since the operation contact 33 is closed, the operation relay 23 turns on the relay contacts 23a and 23C,
In addition, the relay contacts 23b and 23d remain off. Further, the driving permission timer 36 has a timer contact 36a.
, 36b, 36f.

36g on and other timer contact 36C136
d and 36e remain open or remain switched to the normally open side. In this way, only the controller 22 is available for controlling the speed of the delivery motor 16.

On the other hand, the actual tension of the warp threads 2 during weaving is detected by the tension detector 1.
3, and is applied as an actual tension signal A through an averaging circuit 31 to a summing point 21 as a negative signal. Therefore, the controller 22 receives the actual tension signal A and the tension setting device 2 at the addition point 21 on the input side.
0 is compared with the target tension signal E given by 0, and the amount of rotation of the delivery motor 16 is controlled each time based on the difference. Note that this averaging circuit 31 absorbs pulsating changes in the warp tension caused by the shedding motion and the beating motion of the warp threads 2, and applies the same to the joining point 21 while averaging it.

During such normal weaving operation, the encoder 44 detects the rotation angle of the main shaft 43 of the loom and sends it to the decoder 45 as a unique angle signal for each rotation of the loom. Therefore, the decoder 45 converts the digital signal into a signal corresponding to the address of the memory 37, and sequentially selects memory addresses corresponding to the rotation angle during one rotation of the loom. Furthermore, the least significant bit signal of the angle signal from the encoder 44 is input to the one-shot multivibrator 46, so the one-shot multivibrator 46 outputs a launch pulse upon receiving the least significant bit signal. is generated and sent to memory 37 through AND gate 47. Therefore, since the memory 37 is in the write state when its write input terminal is at the "H" level, it is digitized by the A/D converter 40 every time the launch pulse arrives from the one-shot multivibrator 46. The actual tension signal A is stored in a memory address specific to the rotation angle of the loom.

This storage is carried out continuously for every n revolutions of the loom.

That is, during the storage process, the memory 37 samples changes in tension for n rotations of the loom and stores them for each rotation angle during one rotation.

That is, since the timing signal M is inputted to the one-shot multivibrator 51 once for each rotation of the loom, the counter 54 switches a unique signal for each rotation of the loom from the timer contact 36d. It is sent to the decoder 45. Since this memory 37 has an area for recording the tension value data at each angle for the 0 rotation, the tension data for n times is sequentially written to the corresponding address by the signal from the decoder 45. This rnJ is an integer of 1 or more.

Therefore, when m machines stop, the tension data for n rotations before the stop signal is input is stored in the memory 37.

Now, if a weft insertion error occurs during such a weaving operation, the loom control device 19 generates a weft stop signal C of, for example, "H" level, and thereby the weft control device 15
The horizontal stop contact 35 is set to ON, and the operation contact 33 is set to OFF. At the time when this stop signal C is generated, the "H" level operation signal B is no longer present, so
The operation relay 23 is in a de-energized state, and its contacts 23
a is turned off, and the contact 23b is returned to the on state. Therefore, by immediately turning on the contact 24a of the stop relay 24, the stop controller 30
is connected to the summing point 25 on the input side of the drive amplifier 26. At this time, the driving permission timer 36 opens its timer contacts 36b.

During this stop period, the stop tension setter 28 generates a stop tension signal G corresponding to the weak tension in the warp threads 2 when the loom is stopped, and inputs it to the stop controller 30. Here, the stop controller 30 inputs the deviation between the stop tension signal G at the addition point 29 and the actual tension signal A, and receives the stop control signal,
I is generated and added from the summation point 25 to the drive amplifier 2.
Send to 6.

The tension of this stop tension signal G is the target tension signal E during operation.
Since the tension value is set to be smaller than the tension value of
Set the tension at a value smaller than the tension during weaving operation.

Therefore, the loom, with its pick finder function,
Even if the loom finally stops in the open state, the tension of the warp yarns 2 is automatically set to a low value because the warp yarns 2 are further fed out by the feed-out motor 16 when the loom is stopped. As a result, even if the warp yarns 2 are in an open state, the warp yarns 2 will not stretch and the weaving front will not move due to this while the loom is stopped, and the occurrence of stoppages during subsequent weaving can be prevented. .

1, the warp threads 2 are stopped in an open state, so that repair work on the weft threads 2 can be performed quickly.

After a series of repair work, the loom control device 19
When the driving signal B at the "H" level is applied, the driving contact 33 turns on, so the driving relay 23 turns on its relay contacts 23a and 23c, and also turns on the relay contact 2.
3b and 23d are turned off. At this time, the stop relay 24
When is de-energized, relay contact 24a is off and thus controller 3.0 is isolated from summing point 25. Furthermore, until the delay time T has elapsed, the operation permission timer 36 does not operate at the timer contacts 36a, 36.
b, 36f, and 36g are turned off, and the other timer contacts 36c, 36', and 36 (3 are set to remain closed).

During the elapse of the delay time T, that is, during preparation for startup, the AND gate 56 receives a high level signal from the inverting amplifier 57, so the output of the oscillator 55 passes through the AND gate 56 and enters the counter 58. It is activated. This counter 5
8 has already been reset when the relay contact 23d returns, so the counting operation of the transmitter 55 is immediately started. The count value of this counter 58 is determined by the encoder 4
The signal passes through the decoder 45 together with the starting rotation angle of the four looms and becomes a signal for specifying the address of the memory 37. At the same time, the output signal of the AND gate 56 is transmitted to the memory 37.
Since the reading command is given, the calculation control bag 241 reads the tension value for n rotations from the memory 37,
From these data, the average value of tension fluctuation at the starting rotation angle of the loom is calculated.

This averaging is performed to remove harmonics from pulsating tension fluctuations. However, if this is not necessary, n is set to "1" and the stored data for one revolution is used as is. The following description assumes that n≠“1”.

When restarting the loom, when the starting rotation angle of the loom, that is, the starting rotation angle of the main shaft 43, is specified by the encoder 44 as, for example, 180 degrees, the arithmetic and control unit 41 calculates the tension value corresponding to the rotation angle of 180 degrees for the nth light weight. The average value is converted into an analog signal by the D/A converter 42, and sent to the controller 39 via the summing point 38.

Therefore, the controller 39 generates a negative preparation control signal F based on the average tension value during actual weaving before the stop, and reverses the feed-out motor 16 so that the warp threads 2 during the stop period are The weak tension is increased to the actual tension value corresponding to a rotation angle of 180 degrees.

FIG. 6 shows the actual tension change during normal weaving in relation to the target value. The actual tension of the warp threads 2 is under the control of a controller 22, and changes in a pulsating manner around a target value due to shedding motion and the like. During this period, the memory 37 stores the actual tension value for each rotation angle during one rotation over n rotations.

During the stop period, the tension of the warp threads 2 is set to a low constant tension value by the stop tension setter 28 and the controller 30.

Further, after the operation command is issued, before the delay time T elapses, that is, during the startup preparation period, the tension is set to the actual tension value during the weaving operation at the startup rotation angle of the warp threads 2.

In this manner, at the start-up preparation stage, the tension of the warp threads 2 is set to the same value as the tension value during normal weaving before the loom is stopped.

Thereafter, the operation permission timer 36 closes its timer contacts 36a and 36b, thereby generating an “H” level operation permission signal after a delay time T, and setting the loom control device 19 in an operable state. At the same time, the controller 22 is connected to the summing point 25. Therefore, this delay time T must be longer than the time required to completely return to the target tension. Thereafter, the tension detector 13, tension setting device 20, and controller 22 start tension control during the weaving period during steady operation.

Modification of the Invention In the above embodiment, a contact point 24a is interposed in the tension control system during stoppage. For this reason, the tension control as described above is performed only when the weft is stopped. However, the contact 24a
By replacing the loom with a normally closed contact of the operation relay 23, when the loom stops, regardless of the cause of the stop, tension control is performed using a low target tension at the time of stop.

In addition, for such control, similar to the stop relay 24 that operates when the machine stops horizontally, a relay that operates when the machine stops vertically is provided, and the tension control described above is performed only when the cause of the stop is vertically stopped. You can do it like this. therefore,
The target tension value when stopped can be set separately for when the machine is stopped vertically and when it is stopped horizontally.

Further, although the present invention is effective when used in a loom with a pick finder function, it can naturally be applied to a loom without such a function.

Furthermore, in the above embodiment, the target tension at the time of stopping is set by the stop tension setting device 28, but if this set value corresponds to the minimum tension value during operation of the loom, then the tension shown in FIG. As shown in FIG. 2, setting can also be made by providing a minimum hold circuit 60 in the tension detector 13 and applying the output thereof to the summing point 29 via an amplifier 61. Note that the output signal of this minimum hold circuit 60 is preferably adjustable by an amplifier 61.

Effect of the invention The present invention provides the following unique effects.

First, when the weft stops during weaving, the tension of the warp threads is automatically set to a value lower than the target value during weaving, so it is possible to reliably prevent the occurrence of weaving steps due to elongation of the warp threads or movement of the weaving front.

In addition, when the loom is subsequently started up, the tension value is set to the same value as during normal weaving according to the starting rotation angle, so even at the initial start-up of the loom, the same tension as during normal weaving is applied. The occurrence of stopping steps in the woven fabric can be reliably prevented.

Furthermore, during weaving, the actual tension value of the warp threads is stored in memory over one or more rotations of the spindle for each rotation angle during one revolution, and when restarting after stopping, the warp threads in the memorized state are The tension value is read out and used to control the tension of the warp threads at startup in the preparation stage for startup, so the tension control before the loom is stopped is continuously reflected in the tension control when the loom is restarted. Therefore, high-quality continuous control is possible.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view of the loom, FIG. 2 is a block diagram of the electric feed-off control device for the loom of the present invention, FIG. 3 is a circuit diagram of the control circuit, and FIG. 4 is a time chart diagram of the control circuit. FIG. 5 is a flowchart of the control operation, FIG. 6 is a variation diagram of the tension value, and FIG. 7 is a block diagram of another embodiment. 1...Electric sending device of the loom, 2...Warp thread, 3...
Feed out sheheem, 4... tension roll, 7... weft, 13... tension detector, 15... feed out control device,
16...Feeding motor, 19...Loom control device, 20
...Tension setting device, 22.. Controller, 23.. Operation relay, 24.. Stop relay, 28.. Stop tension setting device, 30
...Stop controller, 32...Control circuit, 37...Memory. Patent applicant Tsudakoma Kogyo Co., Ltd. - Figure 7 Figure 4 Debit Figure 5

Claims (2)

[Claims] (1) The process of detecting the actual warp tension during weaving and generating a tension signal, the process of memorizing the actual warp tension from the tension signal at each rotation angle of the loom during weaving operation, and the operation of the loom. A method for controlling the electric weaving of a loom, comprising the steps of: reading out a stored tension signal corresponding to the rotation angle of the loom during a preparation period before starting the loom after a command is issued, and generating a control output for the weaving motor. (2) A tension detector that detects the actual tension of the warp threads during weaving and generates a tension signal, a rotation angle detector that detects the rotation angle of the loom, and a tension detector that detects the tension signal of the tension detector during weaving operation. A memory that stores information corresponding to the rotation angle of the loom and retains it in a readable state for each rotation angle, and a memory tension signal that corresponds to the rotation angle of the loom starting during the preparation period after the loom operation command and before starting is stored as described above. 1. An electric feed-out control device for a loom, comprising a control circuit that reads data from a memory and outputs it to the feed-out motor.