JP3129752B2 - Method and apparatus for preventing weaving of 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 method and a device for preventing a weaving step of a loom for preventing the occurrence of a weaving step due to the stretching of the woven cloth while the loom is stopped.

[0002]

2. Description of the Related Art When a loom is stopped, the position of the front of the loom moves because the woven fabric is stretched, and when the loom is restarted, a weaving step may occur in the woven fabric. In order to prevent this, at the time of starting the loom, the woven fabric is wound up by an amount corresponding to the elongation of the woven fabric, and the position before weaving is adjusted.

[0003] On the other hand, the elongation of the woven fabric while the loom is stopped generally depends on the stop time of the loom. That is, the woven fabric
The elongation y occurs as the stop time t elapses (FIG. 8).
Since the elongation y eventually tends to saturate to a substantially constant amount, in order to effectively compensate for such elongation y, the stop time t = ta is measured, and the elongation y = y corresponding to the stop time ta is measured.
The winding motor may be driven in the winding direction by an amount corresponding to a (Japanese Patent Laid-Open No. 62-53452).

[0004] The loom opens the warp W from the warp beam B1 by means of the heald frames SF, SF (FIG. 9), and the warp opening Wa.
The weft (not shown) inserted into the inside of the cloth is
And the woven fabric Wc is woven. Warp W, Woven Wc
Is stretched between the tension roller TR1 and the guide roller TR2 in a state where a predetermined tension is applied. Further, the woven fabric Wc is formed by pressure rollers TR3a and TR3a.
It is taken up by a woven fabric beam B2 via a take-up roller TR3 accompanied by 3a. The take-up roller TR3 is driven by a winding motor M, and the rotation of the winding motor M is controlled by a winding control device TC.

[0005] The woven fabric Wc has a free length Lo from the cloth fell WF to the nip point between the pressure roller TR3a and the take-up roller TR3 on the upstream side. The WF moves toward the warp beam B1 to form a thick step. In order to prevent this, the winding motor M may be driven in the winding direction by a correction amount corresponding to the elongation ya of the woven fabric Wc, and the correction amount at this time is calculated based on the stop time ta. be able to.

[0006]

According to the conventional technique, there is a problem that if the loom is stopped and restarted a plurality of times within a short period of time, a weaving step may occur. In other words, if the loom is stopped and restarted and then stopped again within a short weaving time such that the weaving length L1 <Lo, at the time of the earlier restart, the freedom generated within the earlier stop time is Since the elongation of the long Lo woven fabric can be compensated, no weaving step occurs. However, with respect to the later restart, the portion mainly extending within the later stop time is the portion of the latest weaving length L1 of the free length Lo, and the remaining portion (Lo-L1) is: Most of that growth has already been compensated for in the earlier restart. Therefore, if the elongation is compensated uniformly for the entire free length Lo every time the stop and restart are performed, the correction amount at the time of subsequent restart becomes excessively large, and a thin section may be generated.

Accordingly, an object of the present invention is not only to consider the present stop time, but also to reflect the parameter relating to the stop before the last time when the weaving length has occurred within a predetermined length, in view of the problem of the prior art. It is an object of the present invention to provide a method for preventing a weaving step of a loom, which can appropriately prevent the occurrence of a weaving step due to the elongation of the woven cloth while the loom is stopped, and a device therefor.

[0008]

According to a first aspect of the present invention for achieving the above object, when the loom is started, the winding motor is driven in the winding direction to adjust the cloth fell position. In doing so, in addition to the current stop time, the weaving length reflects the parameter related to the previous stop that occurred within a predetermined length equivalent to the free length of the woven fabric on the loom, and the elongation of the woven fabric that occurred during the stop. The main point is to determine a correction amount for absorbing the noise and give the correction amount to the winding motor.

The second invention comprises a stop time measuring means for measuring the stop time of the loom and a weaving length determining means for judging that the weaving length is within a predetermined length corresponding to the free length of the woven fabric on the loom. And, in addition to the current stop time from the stop time measuring means, by the discrimination signal from the weaving length discriminating means, the weaving length reflects the parameters related to the previous stop that occurred within the predetermined length, during the stop. The gist of the invention is to provide a correction amount calculating means for calculating a correction amount for absorbing the resulting elongation of the woven fabric, and a correction means for driving the winding motor in accordance with the correction amount from the correction amount calculating means.

[0010] The correction amount calculating means may include a storage device for storing a stop time for each stop of the loom and a weaving length between each stop, or a storage device for storing the stop time for each stop of the loom. And in each case,
The correction amount calculating means can calculate the correction amount based on the contents stored in the storage device.

[0011] The correction amount calculating means may be configured to determine whether the weaving length has occurred within a predetermined length or based on the number of stops and the stopping time period. The correction amount can be calculated.

[0012]

According to the structure of the first aspect of the invention, the correction amount is determined by reflecting, in addition to the current stop time, a parameter relating to the stop before the last time when the weaving length has occurred within the predetermined length. Even if multiple stop and restart are performed in time,
There is no possibility that the correction amount becomes excessive. Here, the predetermined length of the weaving length is a length equivalent to the free length of the woven fabric on the loom, and this is represented not only by the weaving length of the woven fabric but also by the number of picks, operation time, and the like. Can also be expressed. The parameters relating to the stop before the previous stop include the number of stops, the stop time, the stop time zone (refers to an index indicating whether the stop time belongs to a plurality of different time zones, the same applies hereinafter) and the like. . Therefore, each time the loom is stopped and restarted, by reflecting these parameters relating to only the previous stop or these parameters relating to a plurality of stops prior to the previous stop, in addition to the current stop time, the texture generated during stoppage is reflected. The optimum correction amount for absorbing the elongation of the cloth can be determined without excess or deficiency and given to the winding motor.

According to the second aspect, the weaving length determining means determines that the weaving length is within the predetermined length, and the correction amount calculating means determines whether or not the weaving length has occurred within the predetermined length. Since the correction amount is calculated by reflecting the parameters related to the correction, the correction means can appropriately compensate for the elongation of the woven fabric by driving the winding motor in accordance with the correction amount.

The correction amount calculating means includes a storage,
Alternatively, by not providing this, it is possible to appropriately select at least the content of the parameter relating to the previous stop.

[0015]

Embodiments will be described below with reference to the drawings.

The weaving step prevention device for a loom includes a stop time measuring means 10, a weaving length discriminating means 20, and a correction amount calculating means 30.
And correction means 40 (FIG. 1).

Stop time measuring means 10, weaving length determining means 2
0, a loom operation signal S1 from a loom control circuit (not shown) is input, a stop time signal S2 from the stop time measuring means 10, a discrimination signal S2 from the weaving length discriminating means 20.
3 are input to the correction amount calculating means 30.
The correction command signal S4 from the loom control circuit is input to the correction amount calculation means 30 and the correction means 40.
The correction amount Yn from 0 is input to the correction means 40, and the output of the correction means 40 is connected to the winding motor M via the drive circuit DC. A winding control device TC that drives and controls the winding motor M in a steady operation state.
Are also connected to the drive circuit DC.

The stop time measuring means 10 can be formed by a stop time measuring device 11 comprising a general time meter (FIG. 2).

The weaving length determining means 20 comprises a weaving length counter 2.
1, comparator 22, reference value setting device 22a, weaving length calculator 2
The operation signal S1 is input to the reset terminal R of the weaving length counter 21, and the clock terminal CK is
The timing signal St is input. However, the timing signal St is, for example, a pulse signal corresponding to one revolution of the main shaft of the loom.

The output of the weaving length counter 21 is output to a comparator 22
And a weaving length calculator 23, and the comparator 22 is provided with a reference value setting unit 22a. Comparator 2
2. Each output of the weaving length calculator 23 is led to the correction amount calculating means 30, and the former is inputted to the reset terminal R of the stop counter 31 as the discrimination signal S3, and the latter is connected to the memory 32. Have been.

The correction amount calculating means 30 is composed of a stop counter 31 for inputting the operation signal S1 to the clock terminal CK, a storage device 32 for receiving the output of the stop time measuring device 11 and a calculator 33 in cascade. . The correction command signal S4 is branched and input to the storage unit 32 and the calculator 33, and the stop counter 3
The output of 1 is also connected to the calculator 33. The calculator 33 outputs the correction amount Yn to the outside.

The operating signal S1 is set to a high level when the loom is started and the loom is brought into an operating state, and is set to a low level when the loom is stopped and stopped.
The stop counter 31 can count the number of stops n of the loom by detecting and counting the falling of the operation signal S1. Further, the stop time measuring device 11 outputs the operation signal S1
By measuring the time during which the loom is at the low level, the stop time t of the loom can be measured and output.

On the other hand, the weaving length counter 21 outputs the operation signal S
1 and the timing signal St is input to the clock terminal CK, so that the rotation amount a of the main shaft in the operation state of the loom can be measured.
3 can calculate the weaving length L of the woven fabric in the meantime based on the rotation amount a. Further, the comparator 22 receives the rotation amount a, compares it with the reference value ao from the reference value setting device 22a, and outputs a determination signal S3 when a> ao.

In general, the timing signal St is an index indicating the weaving length of the woven fabric, so that the discrimination signal S3 is the weaving length L
Is within a predetermined length Lao corresponding to the reference value ao,
This is a signal for determining whether or not it exceeds this. The reference value ao is such that the predetermined length Lao is Lao = Lo (however, Lo
Is the free length of the woven fabric on the loom).

The stop counter 31 is reset by such a determination signal S3. Therefore, stop counter 3
Reference numeral 1 denotes the number of times the loom has stopped during the period until the resetting by the determination signal S3, that is, the period in which the weaving length L is within the predetermined length Lao.

When the loom has been running for a sufficiently long time, the comparator 22
Outputs a discrimination signal S3 when the rotation amount a of the main shaft exceeds the reference value ao, whereby the stop counter 31 is reset (time X1 in FIG. 3, hereinafter simply referred to as (X1)). ).

Thereafter, when the loom stops (X2), the content of the stop counter 31 becomes the number of stops n = 1, and the stop time measuring device 11 starts measuring the stop time t.

When the loom is restarted (X3), the contents of the weaving length counter 21 are reset and the measurement of the rotation amount a is started by counting the timing signal St. At this time, the content of the stop time measuring device 11 is the stop time t = t1, and the stop time measuring device 11 can output this as the stop time signal S2.

On the other hand, prior to the activation, the storage 3
2. The correction command signal S4 is given to the calculator 33.
Here, it is assumed that the correction command signal S4 is output automatically or manually when the cause of stopping the loom is eliminated and the preparation for starting the loom is completed. Thus, in response to the correction command signal S4, the storage device 32 reads and stores the number of stops n = 1 from the stop counter 31 and the stop time t = t1 from the stop time measuring device 11.

At the same time, the calculator 33 sets the stop counter 3
The number of stops n = 1 from 1 and the stop time t in the storage device 32
= T1 to calculate the correction amount Yn = Y1. That is, the calculator 33 first calculates the number of stops n = 1,
Recognizing that this stop is the first stop occurring at the weaving length L ≦ Lao, the correction amount Yn = Y1 = f (t1) is applied by applying the elongation curve y = f (t) in FIG. ) May be calculated and output. Since the correction means 40 drives the winding motor M in the winding direction via the drive circuit DC by the rotation amount corresponding to the correction amount Yn = Y1, the loom thereafter completes startup in accordance with a normal procedure. Can be.

When the loom is stopped again within a short period of time after the start in this manner (time X4 in FIG. 3), since the rotation amount a at this time is a = a1 <ao, the discrimination signal S3 is obtained.
Is not output, and the number of stops n from the stop counter 31 is updated to n = 2. Further, the stop time measuring device 11 starts measuring the second stop time t = t2.

Similarly, when the correction command signal S4 is output immediately before the restart after the second stop, the memory 32 at this time stores the number of stops n = 2 and the stop time t = t2. And the weaving length L = L from the weaving length calculator 23 at the same time.
Remember 1 Here, the weaving length L = L1 corresponds to the rotation amount a = a1 between the time point X3 and the time point X4 in FIG. 3 because the weaving length counter 21 is reset at the restart after the first stop. It is the weaving length of the woven fabric. Therefore, the calculator 33 calculates a correction amount Yn = Y2 for the second stop / restart based on the number of stops n = 2.

The correction amount Yn = Y2 can be obtained as follows.

That is, first, when Y21 = f (t2) Y22 = f (t1 + t2) -f (t1) is obtained, the correction amounts Y21 and Y22 are respectively obtained at the time X3
From the time X4 to the latest free length Lo
This corresponds to the elongation during the second stop, which is the stop time t2, for the woven cloth having the free length Lo woven before the first stop. However, here, the latest woven cloth has a weaving length L = L1, and the woven cloth woven before the first stop has (Lo-L1) remaining in the free length Lo. It's just that. Therefore, the overall correction amount Y2 is divided into the following formulas: Y2 = Y21 (L1 / Lo) + Y22 ((Lo-L1) / L
o)

When restarting after the second stop, the correcting means 40 drives the winding motor M in the winding direction based on the correction amount Yn = Y2 calculated in this manner.

In the same manner as described above, the third stop occurs (X6), and when it is restarted (X7), the memory 32 further stores the number of stops n = 3 and the third stop. Since the stop time t = t3 and the weaving length L = L2 of the woven fabric woven between the second and third stops are stored, the calculator 33 calculates
The correction amount Yn = Y3 can be calculated by the following equation.

That is, Where Y31 = f (t3) Y32 = f (t2 + t3) -f (t2) Y33 = f (t1 + t2 + t3) -f (t1 + t2)

After that, the calculator 33 calculates the correction amount Yn for the arbitrary number of stops n in which the weaving length L occurs within the predetermined length Lao by the same procedure. When the loom shifts to the normal operation and the weaving length L exceeds the predetermined length Lao, (X
8) Since the determination signal S3 is output from the comparator 22 and the stop counter 31 is reset, the storage unit 32 and the calculator 33 can recognize the subsequent stop as the first stop and process it. .

That is, in this embodiment, when the weaving length L is stopped n times within the predetermined length Lao, the n-th
The correction amount Yn at the time of stopping and restarting the number of times is determined by the current stopping time t.
In addition to n, the parameters related to the (n-1) th stop are determined by reflecting the stop times t1, t2... tn-1 of each stop and the weaving lengths L1, L2. Have been.

In the above description, the weaving length calculator 23 may be omitted, and the storage unit 32 may store the rotation amount a instead of the weaving length L. This is because, when calculating the correction amount Yn, the actual weaving length L is not always necessary, and the rotation amount a is sufficient.

[0041]

Other Embodiments The storage unit 32 in FIG. 2 may not store the weaving lengths L1, L2,... Of the woven fabric between each stop of the loom. In this case, the weaving length calculator 23 in the weaving length determining means 20 can be omitted.

At this time, the calculator 33 calculates the stop time t = t
At the time of restart after the first stop, the correction amount Yn = Y1 is calculated assuming Y1 = f (t1) according to the previous embodiment.

The second weaving length L within the predetermined length Lao
When restarting after the number of stops, the stop time t = t2
, Y2 = f (t1 + t2) -f (t1). Similarly, at the time of the restart after the third stop, Y3 = f (t1 + t2 + t3) -f (t1 + t2), and at the time of restart after the nth stop, Yn = f (t1) + T2 + ... + tn) -f (t1 + t2 +
.. + Tn-1). Since it is not necessary to store the weaving lengths L1, L2,... Between each stop, the configuration of the storage unit 32 can be simplified.

In this embodiment, the (n-
1) The stop times t1, t2... Tn-1 of each stop are used as parameters relating to the stop before the stop.

In many cases, the cause of stopping the n times that the weaving length L occurs within the predetermined length Lao has the same cause, so that the stopping times t1, t2,.
tn-1 can be assumed at a certain time to. At this time, the storage unit 32 can omit this. Therefore, the calculator 33 performs the restart at the time of the n-th stop based on only the stop number n and the current stop time t = tn. The correction amount Yn can be calculated.

Calculator 33 calculates that when the number of stops n = 1,
It is assumed that the basic function y = f1 (t) = f (t) is used, and thereafter, corresponding to the number of stops n = 2, 3,. Is defined (FIG. 4). Next, the calculator 33 calculates the first, second,
.. A correction amount Y1 calculated upon restarting after n stops,
Y2 ... Yn, respectively, May be calculated. Note that the (n-
1) The parameter relating to the number of stops before the number of stops is n = number of stops
1, 2,... Only.

In each of the above embodiments, the weaving length counter 21 may use a pick signal from, for example, a mechanical pick counter instead of the timing signal St. Since the pick signal is generally a pulse signal generated every time the weft is inserted into the loom, the weaving length counter 21 can calculate the rotation amount a of the main shaft of the loom by counting the pick signals. Further, the timing signal St may be replaced with a weaving length signal from a separate weaving length counter that measures the weaving length L of the woven fabric. Since the weaving length signal is a pulse signal output for each unit weaving length of the woven cloth, the weaving length counter 21 can calculate and output the weaving length L by counting this, and the comparator 22 Can detect L> Lao for a predetermined length Lao from the reference value setting unit 22a and output a discrimination signal S3. In this case, the weaving length calculator 23 can be omitted.

The stop time measuring means 10 can be a stop time zone discriminator 12, and the weaving length discriminating means 20 can be an operation timer 24 (FIG. 5).

The operation timer 24 monitors the time during which the operation signal S1 is at a high level, and outputs a discrimination signal S3 when L> Lao. Stop time zone discriminator 12
Are, for example, different set times T1s, T2s (where T1s
<T2s) is a combination of the on-delay timers TR1 and TR2 (FIG. 6), in which both the timers TR1 and TR2 do not operate, the timer TR1 operates, the timer TR2 does not operate, and both the timers TR1 and TR2. Takes three states of operation, so that the stop time t in the current stop is t <T
It is possible to determine which of the stop time zone T1 satisfies 1s, the stop time zone T2 satisfies T1s ≦ t <T2s, and the stop time zone T3 satisfies t ≧ T2s, and output as a stop time signal S2. The timers TR1 and TR2 are set to the normally open contact R
b is reset by opening, and the normally open contact Rb is
It opens when the operation signal S1 becomes high level or instantaneously opens whenever the number of stops n from the stop counter 31 is updated.

The calculator 33 calculates the basic function y = f based on the stop time zone Tk (k = 1, 2, 3) from the stop time zone discriminator 12 and the number of stops n from the stop counter 31.
The correction amount Yn can be obtained by using a step-like function y = F (T) instead of (t) (FIG. 7). That is, when the number of stops n = 1, the stop time zone Tk = Tk1 indicated by the stop time signal S2 at that time gives Yn = Y1 =
F (Tk1), and when the number of stops is n = 2, Yn = Y2 = F (T) corresponding to the stop time zone Tk = Tk2 at that time.
k2) -Y1. When the number of stops n = 3, Yn = Y3 = F due to the stop time zone Tk = Tk3 at that time.
(Tk3) −Y2. Hereinafter, when the number of stops n ≧ 4,
According to this. By increasing the number of timers TR1 and TR2, the stop time t can be made to correspond to an arbitrary number of stop time zones Tk of 4 or more.

The parameters related to the stop before the last time in this embodiment include the number of stops n and the stop time zone Tkj.
(J = 1, 2,... N).

In the above description, the correction amount Yn at the time of the n-th stop / restart is determined by considering not only the current stop time but also all the stop-related parameters after the first stop, that is, the previous stop, that is, Only the parameter relating to the (n-1) th stop may be reflected, or the parameter relating to the predetermined number of stops including the (n-1) th stop may be reflected. In general, the parameter related to the stop before the last two times is longer than the correction amount Y because the time after the stop is long.
This is because the influence on n is not large. It should be noted that the winding motor M may be a motor dedicated to the correcting operation by the correcting means 40, instead of the motor also serving as the winding operation during the steady operation.

[0053]

As described above, according to the first aspect of the present invention, the correction amount given to the take-up motor is determined not only by the current stop time, but also by the last time the weaving length is within the predetermined length. Since the determination is made by reflecting the parameters related to the previous stop, even if the stop and restart are performed a plurality of times within a short time, there is no possibility that the correction amount becomes excessive. There is an excellent effect that generation of a weaving step caused by elongation of the cloth can be properly prevented.

According to the second invention, the stop time measuring means,
By including the weaving length determining means and the correction amount calculating means, the correction amount calculating means reflects, in addition to the current stop time, a parameter relating to the stop before the previous time when the weaving length occurred within the predetermined length. Since the correction amount can be calculated, there is an effect that the first invention can be carried out smoothly.

[Brief description of the drawings]

[Fig. 1] Overall schematic block diagram

FIG. 2 is a detailed block diagram of a main part.

FIG. 3 is an operation explanatory diagram.

FIG. 4 is an operation characteristic diagram showing another embodiment.

FIG. 5 is a diagram corresponding to FIG. 2 showing another embodiment.

FIG. 6 is a connection diagram of a main part in FIG. 5;

FIG. 7 is an operating characteristic diagram

FIG. 8 is a characteristic diagram showing the elongation of a woven fabric.

FIG. 9 is a schematic explanatory view of the overall configuration of a loom.

[Explanation of symbols]

 Wc: woven cloth y: elongation WF: weaving Yi (i = 1, 2,... N): correction amount t, ti (i = 1, 2,... N): stop time Ti (i = 1, 2,...): Stop Time zone L, Li (i = 1, 2,... (N-1)) ... weaving length Lao ... predetermined length n ... number of stops M ... winding motor S3 ... discrimination signal 10 ... stop time measuring means 20 ... weaving length discrimination Means 30: Correction amount calculation means 32: Storage device 40: Correction means

Claims (6)

(57) [Claims] When the weaving machine is started, when the take-up motor is driven in the take-up direction to adjust the cloth fell position, the weaving length is set to the free length of the woven fabric on the weaving machine in addition to the current stop time. A loom for determining a correction amount for absorbing the elongation of the woven fabric generated during the stop while reflecting a parameter relating to the stop before the previous stop occurring within a considerable predetermined length, and providing the correction amount to the winding motor. How to prevent weaving. 2. A stop time measuring means for measuring a stop time of a loom; a weaving length determining means for determining that a weaving length is within a predetermined length corresponding to a free length of a woven fabric on the loom; In addition to the current stop time from the measuring means, the determination signal from the weaving length determination means reflects the parameter related to the previous stop where the weaving length has occurred within the predetermined length, and the woven cloth generated during the stop. A weaving step prevention device for a loom, comprising: a correction amount calculating means for calculating a correction amount for absorbing the elongation of the winding machine; and a correction means for driving a winding motor according to the correction amount from the correction amount calculating means. 3. The correction amount calculating means includes a storage device for storing a stop time for each stop of the loom and a weaving length between each stop, and calculates a correction amount based on the storage content of the storage device. The weaving step preventing device for a loom according to claim 2, wherein 4. The apparatus according to claim 2, wherein said correction amount calculating means includes a storage device for storing a stop time for each stop of the loom, and calculates the correction amount based on the storage contents of said storage device. Weaving device for loom. 5. The weaving step prevention device for a loom according to claim 2, wherein the correction amount calculating means calculates the correction amount based on the number of stops in which the weaving length occurs within a predetermined length. 6. The weaving machine according to claim 2, wherein said correction amount calculating means calculates the correction amount based on the number of stops and a stop time zone in which the weaving length occurs within a predetermined length. Step prevention device.