KR101180816B1 - Warp let-off method and apparatus for weaving loom - Google Patents

Abstract

The present invention relates to a warp tension control method and apparatus for a loom, and an object of the present invention is to prevent a straight end occurring immediately after the loom is started. More specifically, according to the warp tension control method of the loom according to the present invention, the tension value of the warp yarn changed during the stopping period of the loom is returned to the warp tension value in the operating period of the loom. The warp tension control method detects the warp tension during the start preparation period from the generation of the operation command of the loom to the start of the loom, and returns the detected tension value, which is the tension value of the warp yarn to be returned to the preset start of the start. The operation of controlling at least one of warp dispensing and warp winding so as to be close to the target warp tension value, and during the operation period, the warp tension value is detected and the detected tension value is a predetermined normal operation target warp; And controlling the dispensing speed of the warp to approach the tension value, and correcting the return target warp tension value in accordance with the warp tension value in a predetermined period immediately after the start of the start.

Warp, Straight, Tension, Calculator

Description

Warp tension control method and device for looms {WARP LET-OFF METHOD AND APPARATUS FOR WEAVING LOOM}

1 is a schematic view showing an embodiment of a warp dispensing apparatus according to the present invention.

FIG. 2 is a block diagram of the warp dispensing apparatus shown in FIG. 1. FIG.

3 is a time series graph showing a change in warp tension value for explaining the operation of the warp dispensing apparatus shown in FIG.

4 is a schematic diagram showing an embodiment of a display unit of another warp dispensing apparatus according to the present invention.

5 is a schematic view showing an embodiment of a display unit of another warp dispensing apparatus according to the present invention.

6 is a time series graph illustrating the operation of another warp dispensing apparatus according to the present invention.

FIG. 7 is a time series graph showing changes in warp tension values of the same phase during steady operation, intermittent operation and stop.

<Code description>

S1: drive command signal S2: drive signal

10: loom 12: warp

14: delivery beam 16: back roller

18: heald frame 20: body

22: cloth fell 24: weft

26: woven fabric 28: fabric winding roll

30: press roll 32: winding fabric beam

34: delivery motor 36: gear mechanism

38: warp tension sensor 40: warp dispensing device

42: spindle motor 44: spindle

46: winding motor 48: encoder

50: operator 52: setter

54: Memory 56: Indicator

58: warp tension control unit 60: operation button

62: loom controller

Patent Document 1: Japanese Patent Application Laid-Open No. 8 (1996) -16299

The present invention relates to a warp tension control method and apparatus for a loom.

The warp dispensing device controls the dispensing amount of the warp yarns so that the tension of the warp yarns during the operation period from the start of the operation of the loom to the stop of operation remains in a constant range.

However, the tension of the warp yarn in the operation stop period from the operation stop of the loom to the start of the next operation decreases as the time of the operation stop state elapses.

Therefore, a method of setting the start preparation period before starting the start, restoring the lowered warp tension during the start preparation period, and weaving in the operation period following the start preparation period is known (see Patent Document 1).

Specifically, the warp dispensing device detects the rotation angle of the main shaft and the warp tension value during operation of the loom, and stores the detected rotation angle of the main shaft and the tension value of the warp yarn in the storage unit of the warp thread dispensing device.

The loom control device stops the operation of the loom when a picking problem or the like of the weft occurs.

The loom control apparatus rotates a main shaft so that it may become a predetermined rotation angle after the picking problem of a weft thread, etc. are removed.

The warp dispensing device reads the tension value of the actual warp yarn during the loom operation corresponding to the main shaft rotation angle to start the weaving operation from the memory before the stopped loom starts the weaving operation again. A tension return operation is performed for feeding or winding the warp yarn wound around the sending beam.

However, as shown in Fig. 7, the tension value of the warp yarn in the exercise state in other words during the weaving operation of the loom differs from the tension value of the warp yarn in the intermittent operation state or stop state during the slow operation. 7 separately measures changes in warp tension values during normal operation and during slow operation.

Specifically, during normal operation, since the heald of the opening device moves the warp yarn in the vertical direction at high speed, the burden on the warp thread is large, and the tension value of the warp yarn detected is higher than the tension value of the warp yarn during slow operation. Big.

However, in slow driving, in other words, since the movement in the vertical direction of the seed light at the intermittent driving state or at the time of stopping is slow, the burden placed on the warp is small. Therefore, the warp tension value during the weaving operation at the same rotation angle of the main shaft is larger than the warp tension value during stop operation, in other words, during stop operation.

As a result, according to the tension value of the warp yarn at the time of normal operation, since tension return operation | movement is made from a stop state, tension return is not correctly performed. If the correct tension return operation is not performed, since the tension immediately after starting is not stabilized, a straight end is likely to occur.

An object of the present invention is to prevent a straight end occurring immediately after starting the loom.

The loom warp tension control method according to the present invention returns the tension value of the warp yarn changed during the stopping period of the loom to the warp yarn tension value in the operation period of the loom. The loom warp tension control method detects the warp tension during the starting preparation period from the generation of the operation command of the loom to the start of the loom, and the detected tension value is a tension value of the warp warp to be returned to the preset start of the warp. Controlling the operation of at least one of warp dispensing and warp winding so as to be close to the return target warp tension value; during the operation period, the warp tension value is detected, and the detected tension value is a predetermined normal operation target warp tension value; And the operation of controlling the warp yarn discharging speed so as to be close to, and correcting the return target warp tension value according to the warp tension value in a predetermined period immediately after the start of the start.

The warp tension control device according to the present invention starts the operation from the generation of the operation command of the loom to the start of the loom so that the tension value of the warp yarn changed during the stopping period of the loom can be returned to the warp tension value in the operation period of the loom. At least one of warp dispensing and warp winding is controlled so that the tension value detected during the preparation period is close to the preset target warp tension value, which is the tension value of the warp warp to be returned to the start of the start. The warp yarn's tension value is detected, and the dispensing speed of the warp yarn is controlled so that the detected warp yarn tension value approaches a preset normal operation target warp yarn tension value. The warp tension control device includes a setter for setting the normal driving target warp tension value and the return target warp tension value, a memory for storing information according to the warp tension value or the warp tension value, and the warp tension value. Or an indicator for displaying information according to the tension value of the warp yarn.

According to another warp tension control device according to the present invention, the warp tension value changed during the stopping period of the loom is returned from the operation command of the loom to the start of the loom so that the tension value of the warp in the operation period of the loom can be returned. At least one operation of warp dispensing and warp winding is controlled so that the detected tension value is close to the return target warp tension value, which is the tension value of the warp yarn to be returned to the preset start-up, during the start preparation period of During the period, the warp yarn tension value is detected, and the dispensing speed of the warp yarn is controlled so that the detected warp yarn tension value approaches a preset normal operation target warp yarn tension value. The warp tension control device includes a setter for setting the normal driving target warp tension value and the new return target warp tension value, a memory for storing the normal driving target warp tension value and the new return target warp tension value, and starting the normal operation. And a calculator for calculating and setting the new return target warp tension value according to the warp tension value and the normal operation target warp tension value in a predetermined period immediately thereafter.

[Loom]

Referring to FIG. 1, in the loom 10, the warp yarn 12 passes through the back roller 16, the plurality of healds 18 and the body 20 from the delivery beam 14 on which it is wound. It is connected to the cloth pel 22.

The picked weft 24 is immersed in the cloth pel 22 by the body 20 to become a woven fabric 26.

The woven fabric 26 extends from the cloth pel 22 to the fabric winding roll 28. The woven fabric 26 reaching the fabric winding roll 28 is sent out to the fabric winding beam 32 by the fabric winding roll 28 and a pair of press rolls 30. The woven fabric 26 sent out is wound around the fabric winding beam 32.

The delivery beam 14 is rotated by the delivery motor 34 via the gear mechanism 36 constituted by a reduction mechanism such as a gear to send out the plurality of warp yarns 12 in a sheet form.

The tension value acting on the warp thread 12 is detected by the warp tension sensor 38 which detects the load acting on the back roller 16, for example every 1 degree of spindle rotation angle. The detected warp tension value is supplied to the warp thread dispensing device 40 as a tension value T actually acting on the warp thread 12.

Each heald frame 18 is reciprocated up and down by the motion conversion mechanism which receives the rotational motion of the main shaft 44 rotated by the main shaft motor 42, and opens the warp yarn 12 up and down.

The body 20 is oscillated by the motion conversion mechanism which receives the rotational motion of the main shaft 44, and the needle 20 of the weft 24 picked by the opening of the warp yarn 12 is immersed in the cloth pel 22. As shown in FIG.

The fabric winding roll 28 is rotated by a gear mechanism composed of a reduction mechanism such as a gear that receives the rotational motion of the winding motor 46. The rotated fabric winding roll 28 cooperates with the pair of press rolls 30 to send the woven fabric 26 to the fabric winding beam 32.

The rotation angle of the main shaft 44 is detected by the encoder 48. The detected rotational angle of the main shaft is supplied to the warp thread feeding device 40 as the main shaft rotational angle θ.

[Warp dispensing device]

The block diagram of the loom 10 is shown in FIG. The warp dispensing device 40 includes an arithmetic unit 50 for calculating information according to the tension value of the warp thread 12 during a predetermined period immediately after the start of operation, and a setter for setting the normal operation target warp tension value and the return target warp tension value. 52, a storage 54 for storing the information, and a display 56 for displaying the information. In the embodiment described later, the warp thread dispensing device 40 functions as a warp tension control device.

The warp dispensing apparatus 40 controls the dispensing motor 34 of the warp thread 12 so that the warp tension value changed during the stop period of the loom 10 may be returned to the warp tension value in the operating period of the loom 10. .

The tension of the warp thread 12 is detected by the warp tension sensor 38, and the detected warp tension is output to the warp tension control unit 58 as the warp tension detection value T. FIG.

The operation button 60 is a switch which the operator presses when starting and ending the weaving operation. Each time the operator presses the operation button 60, the operation command signal S1 is output to the loom control device 62 and the warp thread dispensing device 40.

The warp tension control unit 58 of the warp thread dispensing device 40 has a calculator 50. The calculator 50 calculates information corresponding to the tension value of the warp yarn 12 in the predetermined period immediately after the start of the startup.

The setter 52 plays a role including setting the normal operation target warp tension value and the return target warp tension value, which is the tension value of the warp yarn to be returned by the start of the startup.

The normal operation target warp tension value and the return target warp tension value are set in advance until the loom starts operation, that is, until an operation command occurs. In addition, the return target warp tension value is a value which can be corrected even after the start of the return operation of the loom as described later.

The calculator 50 calculates information corresponding to the tension value of the warp yarn 12 during a predetermined period immediately after the start of the start, which will be described later.

The memory 54 stores information corresponding to the tension value of the warp yarn 12 during the predetermined period immediately after the start of the startup.

The indicator 56 displays information according to the tension of the warp thread 12.

The delivery motor 34 rotates the output shaft of the delivery motor 34 in accordance with the drive signal S2 from the warp tension control unit 58.

Hereinafter, the operation of the warp dispensing device 40 will be described.

Example 1

The warp dispensing device 40 is a tension value of the warp yarn to be returned to the start of the preset startup during the start preparation period from the generation of the operation command of the loom 10 to the start of the loom. The dispensing amount or winding amount by the rotational operation of the discharging beam 14 on which the warp yarn 12 is wound is controlled to approach the return target warp tension value.

In addition, the warp dispensing apparatus 40 detects the tension value of the warp thread 12 during the operation period, so that the detected warp value 12 of the warp thread 12 approaches the preset normal operation target warp tension value of the warp thread 12. Control the delivery speed.

[Suspension Period]

When the loom 10 is operating and the operator presses the operation button 60, the loom 10 stops. As a result, the driving period ends, and the stop period begins.

In the example of FIG. 3, since the operator pressed the operation button 60, the rotation of the main shaft 44 was stopped at the position where the rotation angle θ was about 50 °.

In the stop period, since the tension is applied to the warp yarns 12 from the delivery beam 14 to the fabric winding roll 28, the warp yarns 12 are stretched. Therefore, the tension value of the warp thread 12 from the delivery beam 14 to the fabric winding roll 28 becomes small as the stopping period becomes longer.

[Start-up period]

When the operator presses the operation button 60, the operation command signal S1 is input to the loom control device 62 and the warp thread dispensing device 40. As a result, the loom 10 shifts from the stop period to the startup preparation period.

The warp dispensing device 40 needs to set the tension value of the warp yarn at the warp preparation period to be the warp tension value suitable for the start of the startup, so that the warp discharging device 40 performs the following return operation.

The warp dispensing device 40 detects the tension of the warp thread 12 by the warp tension sensor 38 during the start preparation period from the generation of the operation command of the loom 10 to the start of the start of the loom 10, The delivery motor 34 is operated to feed or wind the warp yarn 12 so that the detected tension value is close to the return target warp yarn tension value set in the setter 52 in advance, so that the feeding amount or the winding amount of the warp yarn 12 is adjusted. To control. In addition, the feeding amount or the winding amount of the warp thread 12 (woven fabric 26) can also be controlled by the operation of the winding motor 46 similarly.

In this manner, either the feeding motor 34 or the winding motor 46 can be operated to control the feeding amount or the winding amount of the warp yarn 12, and the feeding motor 34 and the winding motor 46 are operated simultaneously. You can also do it. For example, when the winding motor 46 is rotated forward while the feeding motor 34 reversely rotates, the tension of the warp thread 12 can be changed. In this case, the drive signal is directly output from the warp tension control unit 58 to the winding motor 46.

Here, the return target warp tension value is a tension value of the warp thread 12 to be returned until the start of startup.

Thereafter, the loom control device 62 rotates the rotation angle θ of the main shaft 44 so as to be 180 °, which is the body needle start angle.

[Driving period]

When the tension of the warp thread 12 becomes the return target warp tension value, the warp yarn transmitting device 40 outputs a return operation completion signal for which the return operation is completed, to the loom control device 62.

The loom control apparatus 62 which received the return operation completion signal operates the spindle motor 42, the delivery motor 34, and the winding motor 46, starts picking and body needles, and starts operation. In this way, the loom 10 shifts from the starting preparation period to the driving period.

As shown in FIG. 3, when the loom 10 shifts to the predetermined period immediately after the start of the startup, the warp yarn dispensing device 40 uses the average value of the warp tensions detected by the warp tension sensor for each peak as the warp tension average value. The memory 54 is stored at any time.

In the example shown in figure, the warp tension control part 58 makes the start of a predetermined period into the case where 1 peak period has passed since the start of the start preparation period. Therefore, the predetermined period is a five-peak period from the second peak to the sixth peak, calculated from the passage of the start preparation period.

The warp tension control unit 58 further calculates the warp tension average values in the predetermined period, that is, the five-peak period, and stores the average value in the storage unit 54. Therefore, the predetermined period is a target period for calculating the average value of the peak period as the unit period.

When the loom 10 passes a predetermined period, the warp tension control unit 58 displays the warp tension average value and the normal operation target warp tension value on the screen of the display 56. It is preferable that the screen of the display 56 is comprised with a touch panel.

By displaying the warp tension average value and the normal operation target warp tension value on the screen of the indicator 56, the operator can grasp the difference between the normal operation target warp tension value and the warp tension average value by visually observing the screen of the indicator 56. have.

When the operator determines that the average warp tension value is smaller than the normal operation target warp tension value, the operator presses a predetermined button displayed on the screen of the indicator 56 to apply the return target warp to be applied to the return operation of the next start preparation period. The tension value can be modified to a large value.

Further, when the operator determines that the warp tension average value is larger than the normal operation target warp tension value, the operator presses a predetermined button displayed on the screen of the display 56 to return to the return operation of the next start preparation period. You can modify the target warp tension value to a small value.

The variation of the rotational speed of the output shaft of the delivery motor 34 is large, and when the rotational speed does not reach the set rotational speed, and when the rotational speed of the main shaft 44 does not reach the normal rotational speed, The tension value may not be the correct warp tension value. In such a case, the warp tension detection value detected during several peaks immediately after starting is not used for the calculation of the warp tension average value. In this embodiment, the warp tension detection value of the first peak is not used for the calculation of the warp tension average value.

The memory 54 stores the warp tension average value at least until the start of the next startup, in detail, until the calculation of the predetermined period at the next startup is completed.

In this manner, the warp tension average value and the normal operation target warp tension value are simultaneously displayed on the display 56, and the operator presses a predetermined button displayed on the display screen 56 of the loom 10, thereby setting the setter 52. The return target warp tension value set in () can be easily modified.

Therefore, the warp tension change (warp tension drop) and warp are controlled in at least one of the dispensing amount and the winding amount of the warp so as to approach the corrected return target warp tension value in the starting preparation period before the normal operation period of the next weaving. The straight end which occurs immediately after starting the loom due to the change of the feeding speed accompanying the change in tension can be suppressed, so that stable operation can be performed immediately after starting. As a result, the straight edge hardly occurs even immediately after the loom is started.

[Modification 1]

The warp dispensing apparatus 40 mentioned above can also take the following methods.

The minimum unit of the predetermined period for detecting the tension value of the warp thread 12 by the warp tension sensor 38 may be a plurality of peaks instead of 1 peak. For example, a plurality of peaks may determine a weaving pattern or an opening pattern composed of a plurality of peaks in one cycle (period).

In the illustrated example, the calculator 50 calculates the warp tension average value according to all the warp tension values detected in the detection period, but the calculator 50 uses the part of the warp tension values detected in the detection period to calculate the warp tension average value. It can also be calculated.

Specifically, the warp tension average value may be calculated according to the warp tension values continuously detected from the 1st peak to the several peaks of the detection period, and one or more from the plurality of tension values of the warp yarns detected in the detection period. The filtering may be selected, and the warp tension average value may be calculated according to the plurality of selected tension values.

The display unit 56 may display on the screen so that each warp tension average value can be compared for the second to sixth peaks, that is, for each peak, instead of the average warp tension value in the detection period or together with the warp tension average value.

[Modified example 2]

The storage unit 54 details the number of peaks from the start until the average warp tension value reaches the normal operation target warp tension value, or until the warp tension average value reaches the normal operation target warp tension value, that is, a stable state. For example, the number of peaks until the average warp tension value reaches a normal operation target warp tension value continuously for a predetermined peak is stored.

By displaying the stored peak number on the display unit 56, the operator can determine whether to perform the return operation in the next start preparation period according to the stored peak number.

Specifically, when the peak number is large, it means that it takes time until the average warp tension value reaches the normal operation target warp tension value, and it is assumed that the warp tension before starting is greatly reduced.

In addition, the warp tension control unit 58 may automatically determine whether or not the return operation is performed at the next weaving time according to the peak number (period).

In this case, the warp tension control unit 58 determines that the average warp tension value has reached approximately the same state as the normal operation target warp tension value during loom operation. And the memory | storage 54 memorize | stores the peak number when it reaches the state substantially equal to an operation target warp tension value after starting.

When the warp tension control unit 58 automatically determines whether to perform the return operation, for example, a threshold value is set in advance for each machine stop time, and when the number of peaks is larger than the threshold value, the warp operation according to the machine stop time is performed. Can be.

[Modification 3]

The operator may manually change the return target warp tension value of the next return operation in accordance with the number of stored peak periods in the second modification.

For example, when the peak number exceeds the predetermined peak number, the return target warp tension value can be manually increased at a predetermined ratio. In addition, when the warp tension control unit 58 performs the next return operation, the return target warp tension value may be automatically changed in accordance with the peak number.

[Example 2]

Fig. 4 determines whether the setting of the return target warp tension value in the return operation and the difference between the average warp tension average value and the normal operation target warp tension value are within the set allowable range. The setting display screen for displaying the relationship is displayed.

By the operator pressing the increase button B1 and the decrease button B2, the return target warp tension value is changed to a value in the range of 96% to 102% of the normal operation target warp tension value. When the operator presses the increase button B1 and the decrease button B2 once, the return target warp tension value is changed by 1%. If the operator changes to the OFF button of the indicator 56, the warp thread dispensing device 40 does not perform the return operation.

The return target warp tension value can be finely adjusted by setting the percentage of the normal operation target warp tension value and making it changeable. If the normal operation target warp tension value is changed, the return target warp tension value is also changed.

After setting the return target warp tension value, if the operation command signal S1 is input to the loom control device 62 and the warp dispensing device 40, the return operation is performed. When the warp tension reaches the return target warp tension value, the loom 10 is normal. Transfer to the driving period.

When the loom 10 is woven to the first six peaks after starting, the warp tension control unit 58 compares the normal operation target warp tension value and the warp tension average value, and the warp tension average value is smaller than the normal operation target warp tension value. In the case of more than 1 kg, a triangular mark in the right direction is displayed on the determination portion A, and the operator is informed that the actual warp tension during the weaving is larger than the normal operation target warp tension value.

The operator who confirms this reduces the return target warp tension value in order to lower the warp tension during the next weaving.

Moreover, when the normal operation target warp tension value exceeds 1 kg of the warp tension average value, a triangular mark in the left direction is displayed on the determination portion A. FIG. In addition, when the difference with respect to the normal operation target warp tension value of a warp tension average value is less than 1 kg, "O" is displayed on determination part A. FIG. When the display of the determination part A is "O", it means that the optimal warp tension is attained.

Table 1 shows an example of the normal operation target warp tension value, warp tension average value and determination display in warp tension adjustment. And Table 1 has shown the example in the case of directly inputting the percentage in normal running target warp tension value like FIG.

[Table 1]

Weaving
collection Normal driving goal
Warp tension
(Average)
A Return target warp tension value (% of A) during tension return operation
B Average value C from 2nd to 6th peak immediately after loom start
Difference between A and C
AC
Judgment mark One 200kg 200 kg (100%) 190 kg -10 kg ◁ 2 200kg 210 kg (105%) 195 kg -5kg ◁ 3 200kg 220 kg (110%) 205 kg +5 kg ▷ 4 200kg 216% (108%) 199 kg -1kg ○

In Table 1, the normal driving target warp tension value is 200 kg, and the return target warp tension value at the start of the first operation is 200 kg (100% of the normal driving target warp tension value).

First, as a result of the operator starting the first operation, when the average warp tension value is 190 kg with respect to the normal operation target warp tension value 200 kg, the difference becomes -10 kg. Therefore, since the average warp tension value is less than the normal driving target warp tension value, the triangular mark in the left direction is displayed on the determination portion A. FIG.

The operator sees the judgment indicated by the triangle mark in the left direction, grasps that warp tension is further needed, and sets the return target warp tension value to 210 kg (105%) so that the warp tension is increased.

Next, as a result of the operator starting the second operation, the difference between the normal operation target warp tension value and the warp tension average value was -5 kg. As a result, a triangular mark in the left direction is displayed on the determination portion A. FIG. The operator sets the return target warp tension value to 220 kg (110%) so that the warp tension is greater.

Next, as a result of the operator starting the third operation, the difference between the normal operation target warp tension value and the warp tension average value was +5 kg. As a result, a triangular mark in the right direction is displayed on the determination portion A. FIG. The operator sets the return target warp tension value to 216 kg (108%) this time so that the warp tension is reduced.

As a result of the operator starting the fourth operation, the difference between the normal operation target warp tension value and the warp tension average value was -1 kg. As a result, "0" is displayed on the determination portion. As a result, the warp tension is optimal, and the adjustment of the warp tension is completed.

In this way, the operator can easily correct the return target warp tension value by displaying the magnitude relationship between the warp tension value and the normal operation target tension value.

[Modification]

As shown in Fig. 4, the percentages can be changed by pressing the buttons Bl and B2. However, as shown in Fig. 5, the percentages can be directly input numerically. Alternatively, instead of entering a percentage, the return target warp tension value may be numerically entered directly. In addition, the return target warp tension value may be set for each length of the stop period or for each main axis rotation angle θ at the start.

[Example 3]

As shown in Table 1, the warp thread dispensing apparatus 40 may feed back the magnitude relationship in the last return operation to the next return operation. Further, the optimum return target warp tension value in the next return operation can be automatically requested and set. In this case, the calculator 50 calculates the return target warp tension value in the next return operation according to the normal operation target warp tension value and the warp tension average value at the previous return operation.

Moreover, you may change the value which changes a return target warp tension value according to the magnitude of the difference between a mean value of warp tension and a normal operation target warp tension value. For example, when the difference between the warp tension average value and the normal operation target warp tension value is small, the value for changing the return target warp tension value may be reduced.

In this embodiment, the memory 54 stores the warp tension average value at least until the next start start. Specifically, the memory 54 stores the warp tension control unit 58 until the calculation of the return target warp tension value is completed.

Example 4

In the above embodiment, although the set value of the normal operation target warp tension value and the average value of the warp tension value in a predetermined period immediately after starting are used, the return target is not dependent on the detected value at the rotation angle of the main axis of the warp tension value rather than the average value. The warp tension value can also be obtained. The specific example is demonstrated below.

FIG. 6 is a graph showing superimposed values of the detected warp tension values in the same phase with respect to the rotation angle θ of the main shaft and the warp tension values in a predetermined period immediately after starting.

In the illustrated example, the warp tension value immediately after starting is smaller than the normal operation target warp tension value.

Normally, each time the main shaft rotates by 1 °, the warp tension value is detected by the warp tension sensor 38. However, FIG. 6 plots each time the main axis rotates by 30 degrees.

The memory 54 stores the detected value of the normal operation warp tension value. The detected value of the normal operating warp tension value is a variation of the detected value with respect to the rotational angle of the main shaft 44 of the warp tension value when the warp tension is stable in the driving period.

For example, the calculator 50 has a normal operation warp tension value when the rotational angle of the main shaft is 120 ° in a period of a predetermined peak or a plurality of peaks immediately after the start of the loom, and in a predetermined period immediately after the start. Compare the warp tension values. However, the operator may compare the warp tension value immediately after starting with the normal operation warp tension value. In this case, since the calculator 50 does not calculate and compare the average value, the calculator 50 is not provided.

As a result of comparing the values, when the difference is outside the predetermined tolerance (positive or negative tolerance), the return target warp tension in the next return operation to solve the difference. Value is increased or decreased by only a predetermined ratio. Alternatively, as in the practical example 2, the magnitude relationship between the normal operation target warp tension value and the warp tension value immediately after starting may be displayed.

For example, the difference depends on the average of the difference between the detected value of the normal operating warp tension value at the rotation angle θ of the main shaft between the predetermined peaks and the warp tension value in the predetermined period immediately after the start. The return target warp tension value in the next return operation may be calculated so that the average value of the value becomes zero. In this case, the rotation angle θ of the main axis may be a continuous period or may be an intermittent period.

The information according to the warp includes a magnitude relationship between the average value of the warp tension, the detected value, and the average value of the warp tension and the normal operation target warp tension value. As in each of the above embodiments, in order to calculate and compare the average value and the magnitude relationship, the calculator 50 is required.

According to the present invention, the warp tension control method and apparatus for a loom include a task of correcting the return target warp tension value in accordance with the warp tension value in a predetermined period immediately after the start of the start. Therefore, in the start preparation period before the operation period of the next weaving, at least one of warp dispensing and warp winding, in detail, at least one of the warp dispensing amount and the winding amount, so as to approach the corrected return target warp tension value. By controlling the pressure, the end of the loom generated immediately after starting the loom due to the warp tension change (warp tension drop) and the change in the feeding speed accompanying the warp tension change can be suppressed. can do. As a result, the straight edge hardly occurs even immediately after the loom is started.

Here, the predetermined period is a period in which one peak (range in which the main axis of the loom rotates one rotation) is a minimum unit, and for example, one cycle, which is a weaving pattern composed of a plurality of peaks, may be defined as one period.

By comparing the warp tension value in the predetermined period immediately after starting in the exercise state with the normal operation target warp tension value, it is possible to determine whether or not the return target warp tension value of the tension return operation in the previous start preparation period is the optimum value. . Thereby, the return target warp tension value of the next tension return operation can be corrected manually or automatically.

In the operation of the next loom, an optimum return target warp tension value close to the normal operation target warp tension value can be obtained immediately after starting.

Therefore, by performing the tension return operation according to the return target warp tension value at the time of the next weaving, it is possible to suppress the direct end occurring immediately after the start due to the warp tension change (warp tension drop) and the change in the feeding speed accompanying the warp tension change. As a result, stable operation can be performed immediately after starting.

The warp tension control method may further include obtaining an average value of the warp tension values in a predetermined period immediately after the start, and simultaneously displaying the average value and the normal operation target warp tension value. By doing so, since the average value becomes a reference for the actual warp tension value immediately after starting the loom, the operator can grasp the difference between the average value and the normal operation target warp tension value. Thus, since the return target warp tension value of the next loom can be determined according to the difference between the average value and the normal operation target warp tension value, the operator can easily adjust the return target warp tension value in a short time.

The warp tension control method may further include comparing the average value with the normal driving target warp tension value and displaying a magnitude relationship between the average value and the normal driving target warp tension value. By displaying the magnitude relationship between the average value and the normal operation target warp tension value, the operator can grasp the magnitude relationship between the actual warp tension immediately after the loom starts and the normal operation target warp tension value. Therefore, the return target warp tension can be adjusted effectively.

The return target warp tension value can be corrected automatically according to the magnitude of the relationship between the average value and the normal operation target warp tension value, and according to the obtained new return target warp tension value. By doing so, since the optimum return target warp tension value is automatically set every time the loom starts to operate, the number of steps of the operator can be reduced, such as adjusting the return target warp tension.

Claims (6)

A warp tension control method in a loom provided with a warp control device which detects a warp tension value during an operation period and controls a dispensing speed of the warp so that the detected tension value approaches a predetermined normal operation target warp tension value. Starting the loom starting from the generation of an operation command of the loom such that the tension of the warp yarn changed during the stopping period of the loom is approximated (approximately) to the return target warp tension value preset as the warp tension value to be returned until the loom starts. In the warp tension control method of a loom for controlling at least one operation of the delivery motor and the take-up motor based on the detected value of the warp tension detected during the start preparation period up to the set return target warp tension value, A warp tension control method for a loom, wherein the return target warp tension value is corrected based on the warp tension value detected in a predetermined period immediately after the start of the start. The method of claim 1, A warp tension control method for a loom, which obtains an average value of warp tension values in a predetermined period immediately after the start of the operation, and simultaneously displays the obtained average value and the normal operation target warp tension value on an indicator. The method according to claim 1 or 2, The loom which calculates the average value of the warp tension value in the predetermined period immediately after the start of the operation, compares the obtained average value with the normal operation target warp tension value, and displays the magnitude relationship between the average value and the normal operation target warp tension value. Warp tension control method. The method of claim 1, An average value of warp tension values in a predetermined period immediately after the start of the operation is obtained, and the average value obtained is compared with the normal operation target warp tension value, and the return is based on the magnitude relationship between the average value and the normal operation target warp tension value. The warp tension control method of the loom which corrects a target warp tension value. Warp tension for controlling the dispensing speed of the warp such that the detected value approaches the normal operating warp tension value during the loom operation period based on the detected warp tension detected value and the normal operation target warp tension value preset in the setter. As a control device, from the generation of an operation command of the loom such that the tension of the warp yarn, which has been changed during the stopping period of the loom, is approached (approximately) to the return target warp tension value preset in the setter as the tension value of the warp yarn to be returned to the start of the loom. In the warp tension control apparatus for a loom which controls the operation of at least one of a delivery motor and a winding motor based on the detected value of the warp tension detected during the start preparation period until the start of the loom starting, and the return target warp tension value, A memory for storing a detected value of warp tension detected in a plurality of times in a predetermined period immediately after the start of the start, or an average value of a plurality of warp tensions detected in the predetermined period; Indicator Including, The indicator, a. Simultaneously displaying the average value of the warp tension in the predetermined period stored in the memory and the normal operation target warp tension value set in the setter; b. The detected value of the warp tension in the predetermined period stored in the memory and the detected value of the warp tension detected in the normal operation are displayed at the same time. c. A large and small relationship between the average value of the warp tensions in the predetermined period stored in the memory and the normal operation target warp tension value set in the setter is simultaneously displayed. The warp tension control device of the loom which performs the display of any one of the following. Warp tension for controlling the dispensing speed of the warp such that the detected value approaches the normal operating warp tension value during the loom operation period based on the detected warp tension detected value and the normal operation target warp tension value preset in the setter. As a control device, from the generation of an operation command of the loom such that the tension of the warp yarn, which has been changed during the stopping period of the loom, is approached (approximately) to the return target warp tension value preset in the setter as the tension value of the warp yarn to be returned to the start of the loom. In the warp tension control apparatus for a loom which controls the operation of at least one of a delivery motor and a winding motor based on the detected value of the warp tension detected during the start preparation period until the start of the loom starting, and the return target warp tension value, A calculator for calculating a new return target warp tension value based on the detected value of the warp tension detected in the predetermined period immediately after the start of the start, and the normal operation target warp tension value; Wherein the setter sets the new return target warp tension value as the return target warp tension value as the new return target warp tension value is calculated; Warp tension control device of the loom.

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