JP3366400B2 - Control device for weft length storage device in loom - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for a weft measuring and storing device in a loom, and more particularly to a technique for setting a rotating speed of a rotating yarn guide.

[0002]

2. Description of the Related Art Conventionally, in a multi-color weaving machine, a weft measuring and storing device called so-called feeder has been mainly used, in which wefts are stored for a plurality of picks and the wefts are locked by a measuring claw to divide the weft insertion. (See Japanese Patent Application Laid-Open No. 1-213438). In such a weft measuring and storing device,
The weft yarns for multiple picks are wound around the outer circumferential surface of the drum by the rotating yarn guide, the measuring hook is pulled out from the drum to unwind the weft yarn, and if the weft yarn unwinding sensor detects the weft yarn unwinding a predetermined number of times, the length measurement is performed. The claw is inserted into the drum to lock the weft thread.

By the way, in such a weft measuring and storing device, a weft winding amount sensor wound around the outer peripheral surface of the drum detects the decrease of the weft and rotates the rotary yarn guide at a predetermined rotational speed, but the weft is not selected. The tension applied to the weft yarns is made small by making the rotating yarn guide as constant speed as possible by using so as to prevent the yarn breakage between the yarn and the yarn feeder.

The rotational speed setting of such a rotary yarn guide is calculated based on the weft selection period. For example, when two colors A and two colors B are woven at a ratio of 1 pick, B color is 1 color (single color). Speed of 1 pick / (2 picks +
The speed is set to 1/3) (1 / pick) (see JP-A-60-28551).

[0005]

In the length measuring and storing device as described above, it is necessary to prevent the unwinding resistance from increasing due to the wefts being mixed with each other on the outer peripheral surface of the drum. There is a limit (up to about 8 picks). Therefore, in the above calculation method, for example, if the color A has 10 picks and the color B has 40 picks, the color A has 10 / (10 + 40) = 1 for one color (single sheet) of the rotating yarn guide.
Although the speed is / 5, when the color is switched to A and 10 picks of continuous wefts are inserted, the weft becomes insufficient at the above calculated rotational speed, and the weft amount is reduced by the winding amount sensor provided on the drum. Even if it is detected and the winding speed is rapidly increased, it may not be in time and a weft insertion failure may occur.

In view of the conventional problems described above, the present invention improves the technique for setting the rotation speed of the rotary yarn guide to prevent the shortage of wefts and prevent the weft insertion failure. The purpose is to

[0007]

Therefore, according to the present invention, a weft yarn for a plurality of picks is wound around the outer peripheral surface of a drum by a rotating yarn guide, and a measuring claw is pulled out from the drum to unwind the weft yarn. When the weft unwinding is detected a predetermined number of times by, the weft measuring and storing device in the loom, in which the measuring claw is inserted into the drum and the weft is locked, determines the rotation speed of the rotating yarn guide based on the weft selection period. First calculation setting means for calculating and setting based on a predetermined calculation formula, means for determining whether or not there is a shortage of wefts when the calculation and setting are performed by the means, and when the determination means determines the shortage of the wefts, Second arithmetic setting means for arithmetically setting the rotational speed of the rotary yarn guide based on another arithmetic expression different from the arithmetic expression is provided.

Further, while the rotating yarn guide is rotating at the calculated and set rotating speed, the current limit recognized by the control device is detected.
Error signal and external command given to the control device from the outside.
Means for determining whether or not the color signal is different, and the present color signal and the external color recognized by the determining means.
And a means for changing the rotation speed of the rotating yarn guide to the rotation speed at the time of single cutting when it is determined that the signal is different. Further, a means for setting a lower limit speed of the calculated setting rotational speed, a means for judging whether or not the actual calculated setting rotational speed is lower than the set lower limit speed, and an actual calculated setting rotational speed by the judging means. And a means for changing the rotation speed of the rotary yarn guide to the lower limit speed when it is determined that is lower than the lower limit speed.

[0009]

In such a construction, when the rotational speed of the rotary yarn guide is calculated and set based on a predetermined calculation formula based on the weft selection period, it is determined whether or not there is a weft shortage, and when the weft shortage is determined, Since the rotation speed of the rotary yarn guide is calculated and set based on another calculation formula different from the above calculation formula (for example, a single-cutter speed calculation formula), it is possible to prevent the shortage of the weft thread. It is possible to prevent the occurrence of weft insertion failure.

Further, in particular, while the rotating yarn guide is rotating at the calculated and set rotating speed, the current value recognized by the controller is detected.
Color signal and control device externally instructed externally
It is judged whether or not the color signal is different and
And when the current color signal and the external color signal is judged to be different from the rotational speed of the rotary yarn guide it is so arranged to change the rotational speed at a single Ding and the recognized current
Even when the existing color signal and the external color signal are different, it is possible to prevent the shortage of weft yarns and prevent the occurrence of weft insertion failure.

Further, it is determined whether or not the actual calculated set rotational speed is below the set lower limit speed, and when it is determined that the actual calculated set rotational speed is below the lower limit speed, the rotation of the rotating yarn guide is reduced. Since the speed is changed to the lower limit speed, it is possible to prevent the occurrence of slippage due to insufficient torque at the time of low speed of the feeder motor, resulting in insufficient yarn winding amount.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 shows a multicolor, for example, two colors (A color, B color) weft measuring and storing device and respective control devices. In this figure, 1 is a yarn feeder, 2 is a weft, and 3 is a weft measuring and storing device main body, which is hereinafter referred to as a feeder. 4 is a weft insertion nozzle, 5 is a gripper which is provided between the feeder 3 and the weft insertion nozzle 4, and grips the weft 2 held by the length-measuring claw 6 during non-weft insertion, 7 is a weft unwinding sensor, and 8 is It is a winding amount sensor.

A pipe 9 connected to each weft insertion nozzle 4 is connected to a pump 11 via a rotary valve 10. A feeder controller 12 that controls the feeder 3 and a loom controller 13 that controls the entire loom are provided. The feeder controller 12 receives a detection signal output from the angle sensor 15 of the loom spindle 14, a control signal output from the loom controller 13, and a control signal output from the control panel 17 including the manual button 16. Is entered. The control signal output from the feeder controller 12 is the above-mentioned feeders 3.
Is input to each gripper 5 and the rotary valve 10.

Here, the weft yarn 2 drawn from the yarn feeder 1
Is stored in the feeder 3, is weft-inserted into the warp opening by the water injection of the weft-inserting nozzle 4, and is then beaten by a reed (not shown) to weave a woven fabric. The structure of the feeder 3 will be briefly described with reference to FIG. Multiple rollers 21
A roller frame 23 in which A to 21C and 22A to 22C are arranged in a frame shape under the condition that part or all of their central axes are not included in any plane including the frame axis. Is formed. The rotary yarn guide 24 that revolves around the roller frame 23 causes the yarn feeder 1 of FIG.
The weft yarn 2 is wound around the end of the roller frame 23 on the yarn feeder 1 side, and at least one of the rollers satisfying the above conditions 21A to 21C is rotationally driven so as to rotate about the central axis, respectively, and the roller frame The weft yarn 2 wound around the weft 23 is stored while advancing toward the end of the roller frame 23 on the weft inserting nozzle 4 side.

The gripper 5 is constructed such that the gripping portion is driven by a solenoid, and the gripping portion is normally closed by an elastic force of a spring and the gripping portion is opened by energizing the solenoid. Next, starting a motor (hereinafter referred to as a feeder motor) provided in the feeder 3,
The control will be described.

That is, the RUN mode is entered, and the winding amount sensor 8
When the input (PSA, PSB) becomes L (no thread), after the feeder 3 is started, the rotation speed of the feeder motor is controlled as described below. The automatic setting method for the upper limit rotation speed of the feeder motor and the presence / absence of the brake of the motor is as follows.

That is, in this setting method, the upper limit rotation speed of the feeder motor and the presence / absence of the brake (quick stop) are automatically set by the color mode and the color pattern. MTRK is a correction coefficient (correction coefficient for correcting the slip of the motor) at the time of calculating the number of rotations of the motor.
TRK> 1. Then, in the case of a single-cutter, the upper limit rotation speed R of the feeder motor is obtained by the following formula.

R = number of rotations of loom main body × number of unwinding of weft × MTRK Incidentally, “the number of unwinding of weft” in this formula is a predetermined weft insertion length.
This is the number of weft unwinding required for each weft insertion.
The brake is always off. Internal color (within control unit
(The method in which the color pattern for multicolor weft insertion is set in the section)
In the case of, the method of calculating the upper limit rotation speed and the method of determining the presence or absence of the brake vary depending on the color pattern. In the case of mixing, all color patterns having two steps are regarded as mixing, and the upper limit rotation speed and the presence / absence of a brake are determined by the following method.

First, the coefficients VA and VB at the time of mixing are obtained. Assuming that the number of picks of color A is PA and the number of picks of color B is PB, color A: VA = PA / (PA + PB) color B: VB = PB / (PA + PB) where the maximum number of rotations of color A and the brake When the presence or absence is determined, first, the reduced winding amount MKR is obtained as follows.

MKR = 8−PA + PA × VA This formula shows that the number of yarns on the feeder is 4 picks or more (experimentally 4 picks or more, the yarn amount decreases depending on the number of picks to be put in the weft and the number of picks to be added by the feeder). Then, it is clear that weft insertion becomes unstable). In the case of MKR <4, the upper limit rotational speed R is R = the rotational speed of the main body of the loom × the unwinding number of the weft × MTRK The brake is always present.

When MKR ≧ 4, the upper limit rotational speed R is always R = VA × loom machine main body rotational speed × weft unwinding number × MTRK brake. However, when R is less than 200 rpm, R is set to 200 rpm and the brake is always present.

In the case of setting the B color, the setting method is the same except that A and B are replaced with each other. Next, in the case of free replacement, all color patterns having three or more steps are regarded as free replacement, and the upper limit rotation speed and the presence / absence of a brake are determined by the following method. In the case of free replacement, the coefficients VA and VB are determined by pre-reading the color pattern.

The look-ahead of the color pattern means that the color pattern is assembled as follows, for example. Step NO. 1: A color, 1 pick step NO. 2: B color, 2 pick steps NO. 3: A color, 3 pick steps NO. 4: B color, 4 picks Then, the coefficients VA and VB of the color pattern are as shown in Table 1.

[0024]

[Table 1]

That is, VA is the current number of picks of A color, and P
If the number of picks of color A and the current color B is PB, VA = PA
Using the expression / (PA + PB), the calculation is performed from the current A color weft insertion to immediately before the next A color weft insertion. Similarly, VB
Also, in the formula VB = PB / (PA + PB), the current B
Calculation is performed from the color weft insertion to immediately before the next color B weft insertion.

Then, the reduced winding amount MKR is obtained as follows. When MKR = 8−PA + PA × VA MKR <4, the upper limit rotation speed R is: R = loom machine main body rotation speed × weft unwinding speed × MTRK Brake is always present.

When MKR ≧ 4, the upper limit rotation speed R is always R = VA × loom machine main body rotation speed × weft unwinding speed × MTRK brake. However, when R is less than 200 rpm, R is set to 200 rpm and the brake is always present.

In the case of setting the B color, the setting method is the same except that A and B are replaced with each other. Then the external color
(A color pattern for multicolor weft insertion is set outside the controller.
Color control to the control device from the outside.
In the case of the method of inputting a color signal) , the color instruction is external, and thus color prefetching cannot be performed as in the case of internal color. Therefore, the coefficient VA,
The calculation of VB is based on sequential tracking with a delay of one step as shown in Table 2 below.

[0029]

[Table 2]

However, the coefficient calculation is performed only when the following conditions are satisfied, and this is a condition for determining whether the color is an external color. (A) Immediately after the start of the first operation of the external color (that is, when there is no past pick number data. (1), (2),
(Cases of (3) and (4)). (B) The current pick number data of the current color ≦ the past pick number data of the immediately preceding current color.

(C) Past pick number data two colors before the color different from the current color = past pick number data one color before the color different from the current color. (D) The number of past picks before the current color = the number of past picks before the current color. When such a condition is not satisfied, it can be obtained by the formula of the upper limit rotation speed R of the feeder motor in the case of the single-cutter described above.

R = the number of rotations of the loom main body × the number of unwinding of the weft thread × MTRK The brake is always present. When such a condition is satisfied, the reduced winding amount MKR is obtained as described above, and the MK
Depending on the case of R <4 and the case of MKR ≧ 4, R is obtained by changing the expression used. The brake is always off.

Also in this case, when R is less than 200 rpm, R is set to 200 rpm and the brake is always present, and in the case of setting B color, the setting method is the same except that A and B are replaced with each other. However, the feeder motor rotation speed and the presence / absence of the brake at the start of the operation of the loom are the same as the feeder motor rotation speed immediately before the stop of the loom and the presence / absence of the brake. However, when the current pick number data of the current color immediately after the start of the loom> the past pick number data of the current color is reached, the upper limit rotational speed R is R = loom main body rotational speed x weft unwinding Number x MTRK, always with brakes.

Further, the current pick number data of the current color counted from the start of the operation of the loom until the first color change is experienced is also invalidated and not held. However,
If the current pick number data of the current color immediately after the start of operation of the loom> the past pick number data of the current color is satisfied, the data is validated and held when the color switching is experienced.

In the present invention, the first calculation setting means for calculating and setting the rotation speed of the rotary yarn guide based on the predetermined calculation formula based on the weft selection period, and the calculation setting by the means. Second means for determining whether or not there is a shortage of wefts, and secondly calculating, when the shortage of wefts is determined by the determining means, a rotational speed of the rotary yarn guide based on another arithmetic expression different from the arithmetic expression. Setting means is provided.

Further, while the rotating yarn guide is rotating at the calculated and set rotating speed, the current limit recognized by the control device is detected.
Error signal and external command given to the control device from the outside.
Means for determining whether or not the color signal is different, and the present color signal and the external color recognized by the determining means.
And a means for changing the rotation speed of the rotary yarn guide to the rotation speed at the time of single cutting when it is determined that the signal is different. Further, a means for setting a lower limit speed of the calculated setting rotational speed, a means for judging whether or not the actual calculated setting rotational speed is lower than the set lower limit speed, and an actual calculated setting rotational speed by the judging means. And a means for changing the rotation speed of the rotary yarn guide to the lower limit speed when it is determined that is lower than the lower limit speed.

Each of the above means is the feeder controller 1
2 is equipped with software. The control contents of the feeder controller 12 will be described with reference to the flowchart of FIG. Step 1 (abbreviated as S1 in the figure).
The same applies hereinafter), the color pattern is input, and in step 2, it is determined whether the color pattern is the internal color. If the color is the internal color, the process proceeds to step 3.
If it is not the internal color, go to step 4.

In step 3, as described above, VA and VB are calculated to obtain the reduced winding amount MKR. Step 5
Then, it is determined whether or not the wefts are insufficient, that is, whether MKR <4 or MKR ≧ 4. If it is determined in step 5 that the weft yarn is insufficient, proceed to step 6,
As described above, R is calculated by the single-cutter speed formula.

If it is determined in step 5 that the weft yarn is not insufficient, the process proceeds to step 7 and the lower speed limit (200
rpm), and if it is determined that the speed is below the lower limit speed, the process proceeds to step 8 to change the rotation speed of the rotary yarn guide to the lower limit speed. When it is determined that the speed does not fall below the lower limit speed, the routine proceeds to step 9, where the rotational speed of the rotary yarn guide is determined based on the above-mentioned formula of R = VA × loom machine main body rotational speed × weft unwinding number × MTRK.

On the other hand, in step 4, R is calculated by the single-speed formula as described above, and the process proceeds to step 10. In step 10, the external color is sampled, and the process proceeds to step 11 to determine whether the color is the external color. That is, when the conditions (A) to (D) are not satisfied, the process proceeds to step 6 and is determined by the formula of the upper limit rotational speed R of the feeder motor in the case of the single-cutter described above.
When the conditions (A) to (D) are satisfied, the routine proceeds to step 3, where the reduced winding amount MKR is obtained as described above, and the routine proceeds to steps 5, 6, 7, 8 and 9.

As is clear from the above explanation of the flow chart, when the rotational speed of the rotary yarn guide is calculated and set based on a predetermined calculation formula based on the weft selection period, it is determined in step 5 whether or not the weft is insufficient. When it is determined that the weft is insufficient, the rotation speed of the rotary yarn guide is calculated and set in step 6 based on another calculation formula (in this embodiment, a single-cutter speed calculation formula) different from the above calculation formula. By doing so, it is possible to prevent the shortage of wefts,
It is possible to prevent the occurrence of weft insertion failure.

Further, in particular, during the rotation of the rotary yarn guide at the calculated and set rotational speed, the controller is operated in step 2.
From the outside to the recognized current color signal and control device
If it is determined whether the instructed external color signal is different or not, and it is determined that the recognized current color signal and the external color signal are different, in step 4, the rotation speed of the rotating yarn guide is determined. Since the rotation speed is changed to that for a single knife, the current color signal recognized and the external
Even when the error signal is different from the error signal , it is possible to prevent the shortage of weft yarns and prevent the occurrence of weft insertion failure.

Further, in step 7, it is judged whether or not the actual calculated set rotational speed is below the set lower limit speed,
When it is determined that the actual calculated set rotational speed is lower than the lower limit speed, the rotational speed of the rotating yarn guide is changed to the lower limit speed in step 8. Therefore, when the feeder motor is at a low speed, slippage occurs due to insufficient torque. It is possible to prevent the occurrence of a shortage of the yarn winding amount.

As described above, the present invention has been described with reference to the specific embodiments, but the present invention is not limited to this, and is attached to the present invention by those skilled in the art. It should be noted that various changes and modifications can be made without departing from the scope of the claims.

[0045]

As described above, according to the present invention,
When the rotational speed of the rotary yarn guide is calculated and set based on the weft selection period based on a predetermined calculation formula, it is determined whether or not there is a shortage of wefts. Since the rotational speed of the rotary yarn guide is calculated and set based on the arithmetic expression, it is possible to prevent the shortage of wefts and prevent the occurrence of weft insertion failure.

Further, in particular, the current color recognized by the control device is
-External color instructed externally to the signal and control device
If it is determined that the rotation speed of the rotating yarn guide is changed to the rotation speed at the time of single cutting, the current color signal recognized and the external color signal are detected. Even when they are different, it is possible to prevent the shortage of weft yarns and prevent the occurrence of weft insertion failure. Further, when it is determined that the actual calculated set rotation speed is below the set lower limit speed, the rotation speed of the rotary yarn guide is changed to the lower limit speed, so that when the feeder motor speed is low, slippage occurs due to insufficient torque. It is possible to prevent the occurrence of shortage and the shortage of the winding amount.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of a control device of a weft measuring and storing device in a loom according to the present invention.

2A and 2B are views showing the configuration of a feeder in the same embodiment, in which FIG. 2A is a front view and FIG. 2B is a side view.

FIG. 3 is a flowchart illustrating the control contents of the above embodiment.

[Explanation of symbols]

1 yarn feeder 2 weft 3 feeders 4 Weft insertion nozzle 5 gripper 6 measuring nail 7 Weft unwinding sensor Controller for 12 feeders

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Masayuki Koriyama 5-3-1, Shimorenjaku, Mitaka-shi, Tokyo Nissan Texis Co., Ltd. (72) Inventor Junichi Ochi 5-3-1, Shimorenjaku, Mitaka-shi, Tokyo Industrial Techsys Co., Ltd. (56) Reference JP-A-2-68334 (JP, A) JP-A-62-263351 (JP, A) JP-A 1-213438 (JP, A) (58) Fields investigated ( Int.Cl. ⁷ , DB name) D03D 47/36

Claims (3)

(57) [Claims] 1. A weft yarn for a plurality of picks is wound around an outer peripheral surface of a drum by a rotating yarn guide, and a measuring claw is pulled out from the drum to unwind the weft yarn, and a weft unwinding sensor detects a predetermined number of times of weft unwinding. Then, in the weft measuring and storing device in the loom where the measuring claw is inserted into the drum and the weft is locked,
A first calculation setting means for calculating and setting the rotation speed of the rotary yarn guide based on a predetermined calculation formula based on the weft selection period; and means for judging whether or not there is a shortage of wefts when setting the calculation by the means. When the determination means determines that the weft shortage is present, a second calculation setting means is provided for calculating and setting the rotation speed of the rotary yarn guide based on another calculation expression different from the above-mentioned calculation expression. Control device for weft measuring and storing device in a loom. 2. The current color recognized by the control device while the rotating yarn guide is rotating at the calculated and set rotating speed.
External color externally directed to signals and control
A means for determining whether or not the signal is different, and a rotation speed of the rotary yarn guide is determined by the determination means when it is determined that the recognized current color signal and the external color signal are different. 2. A control device for a weft measuring and storing device in a loom according to claim 1, further comprising means for changing the rotation speed to an exact rotation speed. 3. A means for setting a lower limit speed of the calculated set rotational speed, a means for judging whether or not the actual calculated set rotational speed is lower than the set lower limit speed, and an actual calculation by the judging means. The control of the weft measuring and storing device in the loom according to claim 1 or 2, further comprising: a unit that changes the rotational speed of the rotary yarn guide to the lower limit speed when it is determined that the set rotational speed is lower than the lower limit speed. apparatus.