JPS6163749A - Electromotive feed-out controller 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 an electric weaving device for a loom that is effective in preventing weaving steps.

Prior Art When a loom stops due to a weft insertion error, a common method for repairing a weft insertion error is to reverse the loom, remove the defective weft that caused the weft insertion error, and restart the loom. At this time, weaving steps called stop marks usually occur on the woven fabric. The cause of this weaving step is that the weaving shed does not come to an appropriate position even when the loom is reversed, and that there is a transient lack of beating force when the loom is started. That is, when the loom is stopped due to a weft insertion error and the loom is reversed, for example, by one rotation in order to repair the weft, mechanically the pick-up roll and the delivery beam are each reversed by the equivalent of one rotation.

However, the weave does not move by an amount corresponding to one rotation because there is a frictional contact resistance between the warp threads and the presto beam. That is, as shown in Fig. 1, the tension between the sending beam and the warp opening is Fl, the tension between the opening and the presto beam is F2, and the tension between the presto beam and the take-up roll is F1. If the tension is F3, when the loom is operating,
Because of the relationship Fl<F2<F3 between these tensions, even if an attempt is made to reverse the loom by the required amount of rotation during repair, the loom will not move accurately by the same amount as the amount of rotation.

OBJECTS OF THE INVENTION AND MEANS FOR SOLVING THEIR OBJECTS Therefore, a first object of the present invention is to set the magnitude relationship of the tensions of the warp yarns to the opposite state after the loom is operated in reverse.

Therefore, in the present invention, after the loom is operated in reverse to remove defective yarns, only the sending beam is further reversed in the correction stage for restart, and the tension of the warp yarns is reduced to Fl>F2>F.
3, and the difference in tension (F2-F3)
The value of is set to be larger than the contact resistance due to friction on the presto beam, and the cloth opening is moved further than its normal position.

However, even if the weaving head is accurately moved to the desired position with only this operation, if the operation is started in this state, the tension in the warp threads will be high and the woven fabric will not be fully wound at the start of operation, so it is generally A weaving stage called a tread occurs. In addition, if the warp tension is returned to the normal tension while the weaving opening is at the desired position, the weave moves forward, resulting in insufficient beating force at startup, resulting in the formation of weaving steps called thin films. It turns out.

Therefore, the second object of the present invention is to solve the problem of insufficient beating force at the initial start-up after repair of the weft yarns by adjusting the position 7' of the weaving opening. After setting the tension to Fl > F2 > F3 and reversing the weave to move the weave backwards from the desired position, further correction work is performed to send the warp yarns in the normal rotation direction to move the weave slightly backward from the normal position during steady operation. In other words, the cloth opening is placed in a position commensurate with the lack of beating force.

By the way, conventionally, the series of operations described above, namely adjusting the tension of the warp threads and adjusting the weave position, were mainly performed by
It has not been automated because it relies on the skill and intuition of workers.

Therefore, the third object of the present invention is to realize automatic control of tension and weave adjustment when restarting a loom,
The purpose is to ensure that weaving steps can be prevented.

Therefore, the present invention incorporates a sequence circuit inside the feed-out control device, and during correction work before restarting the loom,
The direction of rotation and amount of rotation of the delivery motor can be controlled accurately in terms of time in relation to the winding diameter of the delivery beam.

Structure of the Invention First, FIG. 1 shows the feeding path of the warp yarns 1. As shown in FIG. The warp threads 1 are wound around a delivery beam 2, passing through tension rolls 3 in an almost horizontal direction, forming an opening 5 with a belt 4, and forming a weft thread 7 at the opening 6.
The woven fabric 9 is formed by the reeding motion of the reed 8. As is well known, the woven fabric 9 is wound around the outer periphery of a winding roll 13 by a fixed presto beam 1o and press rolls 11 and 12, and then sequentially wound onto a cloth winding beam 14.

Then, the above-mentioned sending beam 2 and take-up roll 1
3 are driven by a feeding motor 15 and a loom driving motor 16, respectively. Of course, this motor 16 serves as the power source for the other main movements of the loom.

Next, FIG. 2 shows a control system for the above-mentioned feeding motor 15. The main part of this control system, that is, the electric delivery control device 17 of the present invention, is connected to the motor 15 via a summing point 18 and a drive amplifier 19. A tacho generator 20 and an encoder 21 are mechanically connected to the motor 15. This tachogenerator 2° is connected to the summing point 18, and the encoder 21 and the winding diameter detection unit 522 provided in the part of the delivery beam 2 are both connected to the electric delivery control device 17. Electric feed control device 17
In addition to the weft insertion error signal A, the preparation signal B, the operation signal C, and the tension signal of the warp yarn 1, the winding diameter signal F is input, and a speed command signal G is outputted, and necessary sequential control is performed. Note that the tension signal is input to the feed-out control device 17 via the start-up completion contact 23.

Next, FIG. 3 shows the configuration of the electric feed-out control device 17 described above.

This electric feed-out control device 17 is a part thereof, and constitutes a tension feedback system in order to generate a speed command signal G by inputting the tension signal and the winding diameter signal F. That is, the input terminal 25 for the tension signal is connected to the tension setting device 26 and to the summing point 27, for example, to F'ID.
A type of control amplifier is connected to the input end of the 2nd. The control amplifier 28 passes through a sample hold circuit 29, a relay contact 30, a summing point 31, and an output terminal 32.
It is connected to the.

On the other hand, input terminals 33 for the winding diameter signal F are connected to input terminals of function generators 35 and 41 for winding diameter correction, respectively.
The function generator 35 has a forward rotation amount setting device 34 on the input end side.
It is connected to the summing point 31 on the output end side via an amplifier 36, a relay contact 37 for forward rotation, a summing point 38, and a normally closed relay contact 39. Further, the function generator 41 has a reversal amount setting device 40 on the input side.
It is also connected to the summing point 38 on the output side via an inverting amplifier 42 and a relay contact 43 for inversion.

The electric feed-out control device 17 of the present invention includes a sequence circuit 24 which uses a weft insertion error signal A, a preparation signal B, and an operation signal C as input conditions in order to prevent weaving steps. That is, the above-mentioned horizontal insertion error signal A, preparation signal B
, the input terminals 44, 45, and 46 of the operation signal C are connected to the power supply terminal 50 via a relay 47 for horizontal insertion error, a relay 48 for preparation, and a relay 49 for operation.

On the other hand, relay 53. is connected to other control power terminal 51.5z.
54.55 and timer relay 56 as time limit means
．． 57 and 58 are connected like a ladder. That is, the above-described relay 53 is connected in series between the relay contacts 59.60 and the power supply terminals 51.52. A holding contact 61 is connected in parallel to this relay contact 59. In addition, the timer relay 56 has serially connected relay contacts 62 and 63, and the timer relay 57 has
Together with the series connected relay contacts 64, 65, a timer relay 58 is also connected with a relay contact 66 between the power terminals 51, 520, respectively. Further, the forward rotation relay 54 is in series with the relay contacts 67, 68 and the timer contact 69, and the reverse rotation relay 54 is in series with the relay contacts 67, 68 and the timer contact 69.
5 are connected in series with a relay contact 70 and a timer contact 71.72 to a power supply terminal 51.52, respectively. Here, the dotted lines coming out of these relays 53, 54, 55 and timer relays 56, 57, 58 indicate the interlocking relationship with the connected contacts.

The timer relay 58 also operates in conjunction with a timer contact 73 connected between the control end of the sample hold circuit 29 and ground 74. When this timer contact is closed, the sample hold circuit 29
It enters hold mode and holds the input voltage just before it becomes grounded.

Furthermore, when the timer contact 73 is in an open state, the sample and hold circuit 29 transmits the input voltage as it is to the output side. Incidentally, in this embodiment, the encoder 21
The input terminal 75 connected to is not used.

Operation of the Invention Next, the operation of the present invention will be explained with reference to FIGS. 4 and 5.

The electric feed-off control device 17 is connected to the main control device of the loom.
Upon receiving the operation signal C at the H'' level, the operation relay 49 turns on the relay contact 30 and turns off the relay contact 39, thereby using the tension signal as a feedback input during steady operation of the loom. Speed command signal G
is generated and sent to the drive amplifier 19. In other words, the initial tension F1 of the warp yarn l is determined by the tension setting device 26.
is given by the addition point 2 along with the tension signal
7 to the control amplifier 28. Here, the control amplifier 28 performs a proportional operation, an integral operation, and a differential operation as necessary, which are set by the PID setter 28a.
The signal is sampled and held by the circuit 29 and the relay contact 30.
The signal is then sent to the drive amplifier 19 as a speed command signal G. Therefore, the drive increaser 19 controls the rotational speed of the motor 15 based on the speed command signal G, and sets it to the target rotational speed. Note that the rotation of the motor 15 is detected by the tacho generator 20 and fed back negatively to the summing point 18, so the rotation speed of the motor 15 is corrected to a rotation speed close to the target value after feedback control. . On the other hand, since the motor 16 is used to drive a loom, it always rotates at a constant speed. In such a steady operation state, the operation signal C causes the operation relay 49 to close the normally closed contact 3.
9.60 is set to off, the signal from the function generator 35.41 for winding diameter correction is at the addition point 3.
1 is not applied.

By the way, this 1i! ! If a weft insertion error occurs during weaving, the operation signal C changes to "L" level, so relay 4
9 opens the relay contact 30 and stops the rotation of the motor 15;
And the relay contacts 39 and 60 are returned to the on state. At the same time, the horizontal insertion error signal A at the "H" level enters the input terminal 44, so the relay 47 is operated and the relay contact 59 is closed, thereby activating the relay 53. At this time,
The relay 53 closes its holding contact 61, memorizes the occurrence state of the horizontal insertion error, and at the same time closes the normally closed relay contact 62.
is turned off, and the relay contacts 64 and 67 are turned on. Of course, the motor 16 for driving the loom is also set to a stopped state with a delay based on the conventional control method.

When machine m stops due to this width insertion error, the rotation system of mi is rotating at high speed, so the width insertion error signal A
An appropriate braking time is set from the time when `` occurs to the time when the brake stops. In other words, the loom usually taps the weft thread 7 that caused the weft insertion error from the time when the weft insertion error signal is generated, the warp yarn 1 is opened for the next weft insertion, and the next weft thread 7 is inserted into the inside of the opening 5. It stops when it is sent out. Therefore, the time when the operation signal C changes to the "L" level is delayed by the braking time from the time when the lateral insertion error occurs.

While the loom is stopped, the worker performs preparatory work, that is, pulling out defective threads while pulling out the threads. That is, as shown in Fig. 5a, the worker first pulls out the weft thread 7 that has been wefted last, then reverses both the delivery beam 2 and the take-up roll 13 by an amount equivalent to one pick, and as shown in Fig. The warp yarn l is set in an open state at the portion of the defective weft yarn 7', and the defective weft yarn 7' is pulled out. At this time, the new weave 6 2 bits before the stop point
” should theoretically return by an amount equivalent to two picks from the weaving edge position P during normal weaving, but due to the presence of contact resistance due to friction as already mentioned, it returns only a small amount, as shown in the same figure.

After this preparatory work, by the operation of the worker, Fig. 4(a)
As shown in the figure, since the "H" level preparation signal B is input to the unwinding control device 17 for a certain period of time T1 at the top of the time axis, the weaving edge 6 is adjusted during the correction work, that is, when restarting the loom. Work begins. First, the preparatory relay 48 is connected to the relay contact 63 for a certain period of time Tl.
Set 65.68.70 to on state. At this time,
Since the relay contact 62 is in the OFF state, the timer relay 56 does not operate. However, relay contact 6
4.65 are both set to the on state, the timer relay 57 holds the relay contact 72 in the on state for a predetermined time T2 from the time when the preparation signal B at the m Hs level is generated, Moreover, after the time T2 has elapsed, the relay contact 69 is set to the OFF state for the remaining time T3.

When the timer contact 72 remains on for a predetermined time T2, the reversal relay 55 sets the reversal relay contact 43 to be on for a predetermined time T2. The set reverse speed signal H becomes an input to the function generator 41.

Therefore, the function generator 41 receives (7)'' winding diameter signal F while the loom is stopped, converts the reverse rotation speed signal H into a signal inversely proportional to the winding diameter signal F, and outputs 1. In this way, The converted reverse rotation speed signal H is turned into a negative signal corresponding to reverse rotation by the inverting amplifier 42, and is outputted from the output terminal 32 via the relay contact 43, the summing point 38, the relay contact 39, and the summing point 31.

Therefore, the feeding motor 15 rotates in the opposite direction at a certain speed for the predetermined time T2, and the tension difference (F2-F
3) is made larger than the contact resistance due to friction on the presto beam 10, and the cloth opening 6 is further retreated, and as shown in FIG. In this way, the amount of movement of the weave 6 is set constant for the type of warp yarn 1, regardless of changes in the diameter of the warp yarn 1 on the delivery beam 2.

When the above-mentioned fixed time T2 has elapsed, the timer contact 72
is turned off, the relay contact 43 for reverse rotation is turned off, and the reverse speed signal H is output to the output terminal 3 at that point.
No output from 2.

Instead, since the timer contact 69 is immediately turned on, the forward rotation relay 54 rotates the motor 15 in the forward rotation direction for a time T3 at the same time as the reverse rotation is completed. At this time, the position of the cloth opening 6 is at a position 1) which is slightly retreated from the normal cloth opening position P, as shown in Fig. 5d. This corresponds to strengthening the driving force. In addition, the feed amount in the advancing direction (ΔL - Δl) relieves the high tension of the warp yarn 1,
This is effective in preventing the formation of a thick film at the initial stage of startup. Therefore, this new position P° of the cloth opening 6
This is to prevent thin film formation due to insufficient hammering force at the initial stage of startup,
This is a point in harmony with the prevention of thick film due to the increase in the tension of the warp threads 1. In this way, a suitable warp thread 1 tension and a suitable weave opening 6 position are automatically set. Even when feeding in this forward direction, the forward rotation speed signal of the forward rotation amount setter 34 is
is turned into a signal inversely proportional to the winding diameter signal F by the function generator 35, which is output from the output terminal 32 via the amplifier 36, the relay contact 37 for forward rotation, the summing point 38, the relay contact 39, and the summing point 31.

During the above correction work, a series of forward and reverse operations are performed for a certain period of time T.
1, the elongation of the warp yarn 1 during this period is also approximately constant. Note that the predetermined time T of the preparation signal B
1 is set by a one-shot pipe rake or the like on the main control device side of the loom. In this way, when the "H" level operation signal C is input by the operator after the correction work is completed or immediately after, the motor 16
will start immediately. The speed V16 has a normal rise characteristic and reaches a steady speed after a certain period of time. On the other hand, as in the previous case, the operating relay 49 has its relay contacts 39.60 in the OFF state, and its relay contacts 30.60.
66 to the on state. Therefore, the timer relay 58 turns on the timer contact 73 for a certain period of time T4 from that point, and then returns the timer contact 73 to the off state. In this way, the sample and hold circuit 29 is held in the hold mode for a certain period of time T4, stores the voltage at the rotational speed of the motor 15 immediately before stopping, and immediately starts the motor 15 at this speed. Thereafter, the startup completion contact 23 is turned on by the timer relay 58, and the sample hold circuit 2
9 is in the sample mode, the tension signal is sent from the output terminal 32 to the drive amplifier 19 via the control amplifier 28 and the sample and hold circuit 29. In this way, the feeding mower 15 reaches its normal rotational speed.

Here, the rise of the motor 15 is set to be steeper than the rise of the motor 16. The reason for this is to return the weaving opening 6 to the normal weaving opening position rflp before the loom driving motor 16 reaches a steady rotational speed.

Note that when the loom stops due to a stop reason other than a weft insertion error, there is no need to rotate the motor 15 in the normal rotation direction in advance, so the time T for the motor 15 to rotate in the reverse direction is
2, as shown in FIG. 4(b), is set shorter than when the weft insertion error occurs. This short time T2
is set by timer relay 56. In other words “
Since the relay 48 closes its relay contact 63 when the H'' level preparation signal B is input for a certain time T1, the timer relay 56 turns off the timer contact 71 at a certain time - that is, after the elapse of this time T2. Therefore, the relay 55 sets the relay contact 43 for reverse rotation to the ON state until a short time T2 has elapsed from the time when the preparation signal B is input, and outputs the reverse rotation speed signal H from the output terminal 32. By operating in this manner, even if the driving speed is low at the initial stage of starting up the loom, the occurrence of weaving steps can be reliably prevented.

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

During the correction work when the loom is stopped due to a weft insertion error, the sending-off control device uses a timer relay to rotate the sending beam in the opposite direction for a certain period of time to increase the tension of the warp threads, and then sends out the threads for a specified period of time. By rotating the motor in the forward direction, the weaving head is moved slightly backward from the normal weaving position, so that an appropriate beating force can be obtained even when the loom is starting up, and therefore when the loom is stopped. The occurrence of weaving steps can be prevented. These reverse rotations for a certain period of time and forward rotation operation for a predetermined period of time can be automatically performed by sequence control.
Complex operations required at the initial stage of startup are eliminated, the startup operation can be simplified, and the burden on workers can be reduced.

In addition, during this process, the tension in the warp threads becomes abnormally high, but since the period of this tension is accurately regulated by fixed times T2 and T3, the elongation of the threads is constant while the loom is stopped, and therefore The weaving front position can always be set at a desired position, thereby ensuring the effect of preventing weaving steps. Also, during forward or reverse operation during a stop period due to such a weft insertion error, the function generator uses the winding diameter signal as an input condition and generates a signal for setting the forward transposition or reverse rotation amount in a state that is inversely proportional to the winding diameter signal. The amount of forward rotation or reverse rotation at the stage of correction work during the stop period can always be set constant for the warp yarn, regardless of the winding diameter of the warp yarn on the sending beam. The amount can be regulated accurately and the effect of preventing weaving steps can be reliably achieved.

Furthermore, when the loom is started after such correction work, the sample and hold circuit continues to generate a signal immediately before stopping, and when the loom rotation reaches a steady state, the necessary PI operation is performed on the tension signal. This ensures that the necessary warp thread tension is maintained over the transient period of the starting loom.

[Brief explanation of the drawing]

Fig. 1 is a skeleton diagram showing the warp feeding path and the woven fabric winding path, Fig. 2 is a block diagram of the control system of the feed-out motor, Fig. 3 is a block diagram of the electric feed-out control device, and Fig. 4 1 is a time chart of the speed control of the feed-out motor, and FIG. 5 is an explanatory diagram showing the moving state of the cloth opening. ■...Warp thread 1.2...Feeding beam, 5...Opening,
6. Cloth, 9. Woven fabric, 10. Presto beam, 1
3... Winding 'Q roll, 14... Cloth winding beam, 15
... Motor for sending out the controlled object, 16... Motor for driving the loom, 17... Electric sending out control device of the present invention,
19... Drive amplifier, 22... Winding diameter detector, 26... Tension setting device, 28... Control amplifier, 29... Sample hold circuit, 30... Relay contact, 31... Addition point, 32... Output terminal, 34... Forward transposition setting device, 35...
Function generator for winding diameter correction, 37... Relay contact for forward rotation, 38... Addition point, 39... Relay contact, 40...
・Reversal amount setting device, 41...Function generator for winding diameter correction, 4
3...Relay contact for reverse rotation, 47.48.49...Relay, 53.54.55...Relay, 56.57.58
...Timer relay. Patent applicant Tsudakoma Kogyo Co., Ltd. Q't
cc+θ

Claims (1)

[Claims] a control amplifier that performs control operations with inputs of a target tension signal and a warp tension signal as a feedback input;
A sample and hold circuit holds the output of this control amplifier while the loom is stopped, and sends the output of the control amplifier to the motor drive amplifier while the loom is running, and converts the reverse speed signal from the reverse speed setting device into a winding diameter signal. A function generator that outputs a normal rotation speed signal from a forward rotation setting device in a state that is inversely proportional to the winding diameter signal, and a function generator that outputs a normal rotation speed signal from a forward rotation setting device in a state that is inversely proportional to the winding diameter signal. applying the reverse rotation speed signal to the summation point on the input side of the drive amplifier over time, and applying the forward rotation speed signal to the summation point for a predetermined time period shorter than the predetermined time period after application of the reversal speed signal; 1. An electric feed-off control device for a loom, comprising: a time limit means for applying an electric current to the loom.