JPH06102861B2 - Knack back control method and device in electric loom feeding device - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to an electric feeding device for a loom, and more particularly to a method and a device for moving a cloth fell to an appropriate position when the loom is restarted after being stopped.

[Conventional technology]

If the loom stops for a moment, sufficient striking force cannot be obtained at the initial stage of restart, and the warp yarns are stretched during the period during which the loom is stopped. Therefore, when weaving is started as it is, a stop stage occurs. As a measure to prevent this stop stage, before starting the loom, push the tension roll backwards with an air cylinder etc., pull back the weft, and after starting the loom in this state,
There is a so-called kickback device that returns the tension roll to the regular position little by little.

In the conventional mechanical kickback device, it is not easy to set the operation response time and the cloth moving amount due to the warp tension and the air pressure of the air cylinder, and it is difficult to bleed the air in the air cylinder after starting. If you make a mistake, a weaving bar will be generated there.

Although the kickback method is very rational, a mechanical device is used as a method for realizing the kickback method, and thus the above-mentioned adjustment difficulty remains and the effect cannot be sufficiently exerted. Moreover, the kickback amount is set regardless of the stop time, and therefore does not correspond to the warp yarn elongation amount.

[Object of the Invention]

Therefore, an object of the present invention is to use an electric feeding device of a loom instead of a conventional mechanical kickback device, and set the kickback of warp yarns to an optimum state by electric control according to the stop situation. It is to be.

[Outline of Invention]

Therefore, the present invention sets the kickback amount in advance by electrically digitizing it, and also allows the kickback amount to be appropriately changed according to the stop time, and after the loom is stopped,
Immediately before starting, the delivery motor is reversely rotated based on the kickback amount, and when the predetermined amount of reverse rotation is reached, the delivery motor is automatically stopped.

In such a kickback control, the kickback amount can be easily changed according to the weaving conditions and the stop time of the loom, and therefore appropriate control can be performed.

〔Example〕

First, FIG. 1 shows the control system in relation to the delivery of the warp yarn 1. The warp yarn 1 is wound around the delivery beam 2, passes through the tension roll 3, and intersects with the weft yarn 5 at the position of the cloth fell 4 to form a cloth 6. Then, the cloth 6 passes through the breast beam 7, the winding roll 8, and the press roll 9 and is wound around the outer periphery of the cloth winding beam 10 at a constant speed.

On the other hand, the delivery beam 2 is driven by the electric delivery device 11. That is, the feed-out motor 12 of the electric feed-out device 11 is placed under the control of the feed-out control device 13 and the drive amplifier 14 so as to perform the non-uniform speed rotary motion.
It is transmitted via 15 to the outgoing beam 2.

The delivery control device 13 constitutes a tension control system, detects the displacement amount of the tension roll 3 by the load cell 16 and the tension detector 17, and compares the signal of the tension T with a target tension value as a feedback amount. Then, the deviation is used as a signal of the rotation control amount C, and through the addition point 18,
It is given to the drive amplifier 14. In addition, the above-mentioned delivery motor 12
A tacho-generator 19 is connected to, and the amount of rotation thereof is added as a feedback amount and is negatively fed back to the combining point 18.

At this time, the winding diameter D of the sending beam 2 is determined by the proximity sensor.
It is detected by 20 and a winding diameter detector 21, and is an input for winding diameter correction of the delivery control device 13. The above-mentioned configuration of the delivery control device 13 is similar to that of the conventional one, but the delivery control device 13 incorporates the kickback control device 22 of the present invention in addition to the above tension control yarn.

FIG. 2 shows a specific configuration of the kickback control device 22. In FIG. 2, the setter 23 for the kickback amount L and the setter 24 for the constant K are connected to the input ends of the multipliers 26, and the multiplier 26, together with the winding diameter detector 21, It is connected to the input terminal of the divider 27. The output terminal of the divider 27 is connected to one input terminal of the comparator 28.

Also, an encoder 29 connected to the delivery motor 12
Is connected to the other input terminal of the comparator 28 via the counter 30. The output terminal of the comparator 28 is connected to the reset input terminal R of the RS flip-flop 31 as a memory circuit, and the kickback command switch 32 is the set input terminal of the flip-flop 31. It is connected to S. The flip-flop 31 is connected to a relay 34 for driving a contact 35 through an inverting amplifier 33 at an output terminal Q, and is also connected to a one-shot multivibrator 36 for branching and clearing the counter 30. There is.
The contact 35 is the speed setting device 25 during kickback operation.
And the addition point 18 described above.

Next, the operation of the electric feed device 11 and the kickback control device 22 will be described.

During the normal weaving operation, the cloth 6 is wound around the cloth winding beam 10 at a constant speed. On the other hand, the delivery motor 12
The amount of rotation of the delivery beam 2 is controlled based on the change in tension of the warp yarn 1 as the weaving progresses, and the warp yarn 1 is delivered under a constant tension. Such control of the delivery motor 12 is performed by the delivery control device 13.

That is, the feed-out control device 13 receives the signal of the tension T from the tension detector 17 and the signal of the winding diameter D from the winding diameter detector 21, and the rotation control amount C inversely proportional to the winding diameter D at that time.
Signal and feeds it to drive amplifier 14. Here, the drive amplifier 14 is based on the signal of the rotation control amount C,
The amount of rotation of the delivery motor 12 is controlled each time. The rotation amount of the feed-out motor 12 is electrically detected by the tachogenerator 19, added as a feedback signal, and negatively fed back to the combining point 18.

On the other hand, if a stop cause such as a weft insertion error occurs during such a weaving operation, the feed-out control device 13 receives the stop command, causes the rotation control amount C to disappear, and stops the feed-out operation. In general, the loom rotates at a high speed during weaving, and therefore, after the extra rotation of one cycle from the time of receiving the stop command, the loom stops. Therefore, when the weft yarn 5 is repaired, the weft yarn 5 that has been misplaced is removed after the extra weft yarn 5 is removed by reversing the loom.

After such a repair work, a mouthpiece work is performed, and the loom is ready to be restarted. However, when the loom is restarted in this state, as described above in the section of the prior art, the loom is stopped due to the lack of the beating force at the initial stage of rotation of the loom and the elongation of the warp yarn 1 during the stop period. Steps or castors will occur.

Therefore, the kickback control device 22 pulls back the cloth fell 4 by an appropriate amount to prevent the occurrence of the stop stage.

Now, the pullback amount of the warp thread 1, that is, the kickback amount L
Is expressed by the following equation, where D is the winding diameter of the delivery beam 2 and θ is the rotation angle.

L = Dθ Then, the rotation angle α of the delivery motor 12 becomes α = mθ, where m is the gear ratio of the gear 15, and is therefore expressed as follows.

α = mL / D On the other hand, the encoder 29 connected to the feed motor 12
When the number of pulses generated per rotation is P, the rotation angle per pulse is represented by P / 2π. Therefore, the rotation pulse number N at the rotation angle θ can be obtained by the following formula.

Where mP / 2π is a value unique to the system,
It is given by 24 as a constant K. In this way, the rotation pulse number N of the feed motor 12 required to move the cloth fell 4 by the kickback amount L is obtained by calculation.

Therefore, the multiplier 26 inputs the constant K and the kickback amount L, calculates the product thereof, and also inputs the signal of the winding diameter D by the divider 27 to calculate the rotation pulse number N. Is fed to one input end of the comparator 28.

Here, the winding diameter detector 21, the setter 24, the multiplier 26, and the divider 27 constitute a setting means for calculating the rotation amount.

When the kickback command A is given by operating the switch 32, the flip-flop 31 is set. Therefore, the flip-flop 31 outputs an "H" level output signal as a rotation start command to excite the relay 34. By
Set contact 35 to the on state. These flip-flop 31, inverting amplifier 33, relay 34 and its contact 35 are
It constitutes a rotation command means.

At this time, the voltage corresponding to the maximum speed of the feed motor 12 from the speed setter 25 is given to the feed motor 12 as a signal of the kickback rotation control amount C'in the reverse direction via the addition point 18 and the drive amplifier 14. . Then, the delivery motor 12 is based on the given voltage value,
The delivery beam 2 is rotated in the opposite direction by the required kickback amount L in a short time.

On the other hand, when the flip-flop 31 outputs the "H" level output, the one-shot multi-vibrator 36 sets the counter 30 to the clear state and returns it to the initial state. The rotation amount of is detected by the encoder 29 as the actual rotation pulse number N ', counted by the counter 30, and sent to the comparator 28 as a digital feedback signal. Here, the encoder 29 and the counter 30 constitute a rotation amount detecting means.

The comparator 28 compares the rotation pulse number N with the actual rotation pulse number N ', and when they match, generates a coincidence signal B as a rotation stop command and sets the flip-flop 32 to the reset state. At this time, the relay 34 sets the contact 35 to the off state, so that the feed motor 12 immediately stops. In this way, the cloth fell 4 has a predetermined kickback amount L
Will only move backwards. Of course, this movement amount is an appropriate amount that can effectively prevent the occurrence of the stop. After the position of the cloth fell 4 is corrected as described above, the loom is set to the activated state to start the normal weaving.

In the above embodiment, the kickback amount L is set in advance by the setter 23 in consideration of the weaving conditions and the like. In the specific example of FIG. 3, the kickback amount La, An example of changing Lb ... Ln is shown. That is, the plurality of setters 23a, 23b ... 23n are respectively connected to one input end of the multiplier 26 via contacts 35a, 35b ... 35n as selecting means. And these contacts 35a, 35b
.. 35n is driven by selection means such as a decoder 38, inverting amplifiers 33a, 33b..33n and relays 34a, 34b..34n.

On the other hand, the counter 39 returns to the initial state at the time of receiving the signal of the loom stop command E, and from that time, the reference time generator.
Count clock pulses Ps from 40. Therefore, the decoder 38 selectively sets one of the contacts 35a, 35b, ... 35n to the ON state according to the output of the counter 39, that is, the content of the count. By doing so, the feedback amount L is given as an amount corresponding to the stop time of the loom. The measurement of the stop time corresponds to the correction by the movement of the cloth fell 4 due to the elongation of the warp yarn 1. Where the counter
39 and the reference time generator 40 constitute a time measuring means.

[Other Examples]

Next, in all of the above embodiments, the winding diameter D is directly used as an input condition. However, in the embodiment of FIG. 4, during the continuous operation of the loom, the feed motor for one rotation of the loom, that is, for one pick is equivalent. An example of a circuit for detecting and storing 12 rotation amounts and obtaining a signal corresponding to the winding diameter D from this rotation amount is shown.

That is, when the loom is in operation, that is, when the operation switch 41 is in the on state, the pulse F of one revolution (one pick) of the loom passes through the AND gate 42 and the clock input of the 1/2 division type flip-flop 43. Has become. This flip-flop 43 outputs "H" level with one rotation pulse, and outputs "L" level with the next one rotation pulse. Generates H "level pulse. The “H” level output of the flip-flop 43 is input to the one-shot multivibrator 44,
The counter 45 is returned to the initial state. Encoder 29 at the same time
The signal of the rotation pulse from is passed through the AND gate 46 and counted by the counter 45. Then, the count value of the counter 45 is stored by the next latch 47. The latch 47 holds the count value of the counter 45 by the one-shot multivibrator 48 based on the output signal of the flip-flop 43 output every two rotations. Here, the operation switch 41, the AND gate 42, the flip-flop 43, the one-shot multivibrator 44, 48, the counter 45, the AND gate 46, and the latch 47 together with the multiplier 26 constitute a setting means for calculating the rotation amount by calculation. There is.

In this way, the latch 47 detects the rotation amount of the delivery motor 12 per one rotation of the loom every two rotations of the loom, that is, every two picks. Therefore, the stored value is a signal corrected by the winding diameter D. Has become. Here, the multiplier 26 calculates the rotation pulse number N corresponding to the kickback amount L by multiplying the count value of the latch 47 by the scale factor Z of the scale factor setter 49. Send to one input end of.

On the other hand, the signal of the encoder 29 is input to the counter 30 via the AND gate 50 when the flip-flop 31 is in the set state, that is, when the kickback command A is received. The counter 30 is returned to the initial state by the one-shot multivibrator 36 in response to the kickback command A. When the output of the counter 30, that is, the actual number N'of rotation pulses and the output of the multiplier 26 match, the flip-flop 31 enters the reset state, so that the kickback operation automatically ends.

[Other Embodiments]

Although the above embodiments clearly show the circuit blocks for the necessary operations, this function can also be configured by utilizing the arithmetic and control functions of the computer. Further, in order to remove the influence of frictional force such as a heddle in the path of the warp yarn 1 from the delivery beam 2 to the fabric end 4 when the fabric end 4 is pulled back and move the fabric end 4 accurately,
Is reversed more than necessary, and then the warp yarn 1 is fed in the normal direction by the required amount, whereby the position of the cloth fell 4 can be set more accurately in a state where the influence of friction and the like is eliminated.

In the above embodiment, the target rotation amount of the delivery motor corresponding to the preset kickback amount is compared with the actual rotation amount, and the rotation control of the delivery motor is performed under so-called feedback control. Instead of this, comparison with the actual rotation amount may be omitted, and rotation control of the feed motor may be performed under open loop control.

Further, in the above embodiment, in order to output the kickback amount corresponding to the stop time of the loom, a plurality of kickback amount setters are selected based on the measured stop time. Alternatively, a function generator may be provided that defines the relationship between the stop time and the kickback amount in advance, and the corresponding kickback amount may be output based on the measured stop time.

〔The invention's effect〕

In the present invention, since the kickback amount can be freely set according to the stop time, it is possible to appropriately deal with the warp yarn elongation.

[Brief description of drawings]

1 is an overall block diagram of a delivery control device, FIG. 2 is a block diagram of a kickback control device of the present invention,
3 and 4 are block diagrams of the main part of the present invention. 1 ... Warp thread, 2 ... Delivery beam, 4 ... Origami, 11
...... Electric feeding device, 12 …… Feeding motor, 13 ……
Send-out control device, 14 ... Drive amplifier, 17 ... Tension detector, 21 ... Roll diameter detector, 22 ... Kickback control device,
23, 24 …… Setter, 25 …… Speed setter, 26 …… Multiplier, 27 …… Divider, 28 …… Comparator, 30 …… Counter, 31
...... Flip-flop, 40 …… Reference time generator, 43 ……
Flip-flop, 44 …… One-shot multivibrator, 45 …… Counter, 47 …… Latch, 49 …… Magnification setting device.

Claims (2)

[Claims] 1. A weaving loom (12) is rotated by a rotation control of a weaving motor (12) while the loom is in operation, and a warp thread (1) is fed out, and before restarting after the loom is stopped.
In the electric feeding device (11) of the loom, which rotates the feeding motor (12) in a predetermined direction and moves the cloth fell (4) by a predetermined kickback amount, the stop time after the loom is stopped is measured, and the kickback is performed. A kickback control method in an electric feed device for a loom, characterized in that the amount is changed according to the stop time of the loom. 2. A feed-out motor (12) is rotationally controlled based on a change in tension of the warp thread (1), and a feed-out beam (2) is rotated by the rotation of the feed-out motor (12),
A setting device (23, 23a ... 2) for setting a plurality of kickback amounts in an electric feed device (11) of a loom that feeds warp threads (1) in accordance with the progress of weaving.
3n, 49) and time measuring means (39, 4) for measuring the stop time after the loom is stopped.
0) and a selecting means (38, 33a ... 33n, 34a ... 34n, 35) for selecting one of a plurality of kickback amounts according to the stop time.
a ... 35n) and setting means (21, 24, 26, 27, 41, 42, 43, 43) for calculating the rotation amount of the feed motor (12) corresponding to this based on the selected kickback amount. 44, 45, 46, 47,
48), and a rotation command means (31, 33, 34, 35) for inputting a kickback command and giving a rotation start command to the drive amplifier (14) of the delivery motor (12), and a delivery motor (during the kickback operation). 12) The rotation amount detecting means (29, 30) for detecting the actual rotation amount, and the rotation amount from the rotation amount detecting means and the rotation amount from the setting device are compared, and when the both match, the feed motor ( 12)
Comparator (2 that gives a rotation stop command to the drive amplifier (14) of
8) A kickback control device for an electric feed device of a loom, characterized by comprising: