JPH0424244A - Weaving of satin stripe woven fabric and the like - Google Patents

Abstract

PURPOSE:To prevent the insufficient warp opening by independently controlling the tension of a part of warps crossing with small number of wefts and that of the remaining warps crossing with large number of wefts in the course of delivering a warp from a warp beam. CONSTITUTION:The fabric is produced by delivering a warp from single warp beam. In the above process, a part of warps crossing with small number of wefts and the remaining part of warps crossing with large number of wefts are wound round on respective exclusive tension rolls. The above warps crossing with small number of wefts are actively loosened during the period from at least the closure of the warp to the start of beating and the warp tension is set to a level lower than the tension of a stage other than the above period. The warp crossing with small number of warps and having a loosening tendency is transferred toward the cloth fell in contact with wefts to prevent the insufficient opening of the warps.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is applicable to fabrics that have a partially different texture in the width direction, such as satin striped fabrics, fine pattern fabrics, and fabrics dotted with small patterns. The present invention relates to a method for weaving a fabric in which the number of intersections of the warp yarns with the weft yarns in a portion is smaller than in other portions.

[Conventional technology]

For example, when weaving a satin striped fabric, such as a handkerchief, in which a stripe of a satin weave is included in a plain weave, the warp of the satin part and other warp yarns are combined into a single thread in order to make the warp yarn preparation process into a cylinder. It is designed to be fed out from the warp beam. In the process of weaving the satin striped fabric, the warp yarns other than the satin portion and the warp yarns in the satin portion are each subjected to tension control via dedicated tension rolls.

In this case, even though the amount of warp threads drawn out from one beam is the same in the satin part and the non-satin part, when the fabric is made, the consumption of the warp threads in the satin part is the same as that of the warp threads in the non-satin part. If the weft is smaller than the amount, the warp threads in the satin section will become loose, resulting in poor shedding, and the weft threads will get caught on the warp threads during weft insertion, causing weft jams.

In this way, in addition to satin striped fabrics, small-patterned fabrics, and fabrics with scattered small patterns, the weave structure is different in only a part in the width direction of the fabric, and in this part, the number of interlaces of the warp yarns with respect to the weft yarns is different. In a woven fabric with a small number of interlaces compared to other parts, the warp threads become loose on the warp line in the part where the number of interlaces is small, resulting in the above-mentioned problems.

The invention disclosed in Japanese Patent Application Laid-Open No. 2-41439, when weaving a soccer fabric, sends out the soccer warp yarns and the ground warp yarns from separate beams, and weaves the soccer warp yarns at least during the period from the closing operation of the warp yarns to the beating operation. Actively disclosing loosening. Also in this soccer weaving process, the tensions of the soccer warp yarn and the ground warp yarn are controlled separately.

However, satin stripe fabric and soccer fabric are
Basically, the type of fabric to be woven is different.

In other words, in soccer fabric, in order to vary the weaving rate of the soccer warp yarns and the ground warp yarns, the warp yarns are sent out from separate beams, and the amount of feed of each warp beam is actively varied, so that the soccer warp yarns are interwoven at a predetermined time. By actively loosening it, a wavy soccer pattern is created. In order to make the weaving rates different in this way, it is necessary to let out the soccer warp yarns and the ground warp yarns from separate beams. On the other hand, in the case of the satin striped fabric that is the object of the present invention, the weaving ratio is the same in the satin part and the non-satin part, and the satin part is only a part of all the warp yarns, so If the warp yarns were to be fed out from a dedicated beam, as in a soccer loom, not only would the equipment be large-scale, but the work process would be complicated at the stage of preparing the warp yarns.

Therefore, the weaving of satin striped fabrics and the like differs from the weaving of soccer fabrics not only in terms of the objects to be woven but also in the feed motion of the loom.

[Purpose of the invention]

Therefore, an object of the present invention is to make it possible to independently control the tension of some warp yarns with a small number of intersections and the remaining warp yarns with a large number of intersections with respect to the weft yarns in the process of unwinding the warp yarns from one warp beam, and to This is to prevent looseness of warp threads such as warp yarns and to prevent opening defects.

[Solution means and effects of the invention]

With the above object in mind, the present invention is based on the premise that warp yarns are paid out from one warp beam, and in the process, a part of the warp yarns with a small number of intersections and the remaining warp yarns with a large number of intersections are transferred to a dedicated tension roll. The warp yarns are wound separately, and some of the warp yarns with a small number of interlacings are actively loosened at least during the period from the closing operation of the warp yarns to the beating operation, and the tension is set lower than the tension other than the above period. I have to.

As a result, the warp yarns, which tend to be loose and have a small number of interlaced lines, are driven into the front of the weaving while making contact with the weft yarns.
Looseness of the warp threads is reliably transmitted to the weaving front, and shedding defects can be prevented. In particular, by setting the timing of slack transmission at the closing time when each mail of the warp yarns is aligned with the warp line,
The transmission of slack in the warp yarns is not affected by the shedding movement and is reliable.

Here, the warp thread slack is transmitted to the front of the weave and absorbed by the woven fabric, but this slack does not appear as such a slack that it deteriorates the quality of the fabric. The time for loosening the warp threads may be any time necessary to prevent opening defects during the next weft insertion.

Here, the tension of the warp yarn with a small number of crossings with respect to the weft yarn is set to a low tension by changing the swinging torque of the tension roll or by moving the tension roll in the tension relaxation direction. This loosening operation is performed every cycle or every predetermined repeated cycle.

In addition, when the warp threads intersect with the weft threads, the slackness of the warp threads is effectively transmitted to the weaving front, so if the warp thread tension is loosened at each predetermined repetition cycle, the warp threads will not intersect with the weft threads when they are loosened by chance. It is also predicted that it will be a cycle.

At this time, the loosened condition of the warp threads is not sufficiently transmitted to the front of the weave. Therefore, it is preferable to perform the loosening cycle every cycle.

〔Example〕

FIG. 1 shows a schematic configuration of a loom 1 according to the present invention.

The warp yarn 2a which has a large number of intersections with the weft yarn 3, and the warp yarn 2b which has a small number of intersections with the satin stripe portion, that is, the weft yarn 3, are both wound around one warp beam 4 and are unwound from there. One warp yarn 2a passes through the first tension roll 5 and follows the warp line, and the other warp yarn 2b passes through the second tension roll 5.
It passes through the tension roll 6 and the loosening roll 7, reaches the warp line, is pulled through both the dropper 8 and the belt 9, and due to the vertical movement of the belt 9, intertwines with the weft thread 3 at the opening position, and is woven by the reed 12. It is woven into a satin striped fabric 11. And this textile 1
1 is wound up by a winding roll 13 and wound around a winding beam 14.

Here, the warp beam 4 is driven under tension control to rotate in the delivery direction by a delivery motor 15 and its delivery controller 16.

That is, the feed-out controller 16 detects the tension of the warp yarns 2a with the tension detector 17 at the position of the first tension roll 5, and sends an electrical signal of the detected tension to one input end of the feed-out controller 16. I'm sending it in. The feed controller 16 inputs the signal of the target tension set by the tension setting device 18 from the other input terminal, and controls the feed motor while taking into account the winding diameter correction according to the deviation between the target tension and the actual detected tension. By rotating the threads 15 in the sending direction, the tension of the warp threads 2a is delivered to a target tension.

When the warp threads 2a are fed out, the warp threads 2b are also fed out by the same amount, but the tension thereof is controlled by a loosening controller 20 in a separate system. This loosening controller 20 detects the rotation angle of the main shaft 19 with an angle detector 21, and controls the feed tension during the period from the beating operation to the closing operation, during the period from 20° to 270' in terms of crank angle. Second
The actual tension of the warp yarns 2b is detected by the tension detector 22 at the position of the tension roll 6, and this detected tension is compared with the target tension set by the tension setting device 18. By controlling the torque of the arm 24 attached to the output shaft of the drive motor 23,
The tension of the warp threads 2b is controlled to match the target tension by controlling the torque of ° to 20 via 360″ (o″)
In the period up to ', the loosening roll 7 is moved in the loosening direction of the warp yarns 2b, that is, in the direction of the weaving front 1o, by executing position control of the loosening roll 7, that is, rotation amount control of the drive motor 23, instead of torque control. At the end of the loosening control period, it is returned to its original position and normal torque control is resumed. At this time, the amount of rotation of the arm 24 is detected by the pulse generator 25, and the loosening controller 2o
amount of feedback.

FIG. 2 shows, for each control period corresponding to the crank angle,
The relationship between the change in tension of the warp yarns 2b and the position of the loosening roll 7 is shown.

As already mentioned, in the weaving process of satin striped fabrics, the warp threads 2b in the satin section are woven with a smaller number of interlaces with respect to the weft threads 3 than the warp threads 2a in other non-satin sections, and the number of interlaces with respect to several weft threads is smaller than that of the warp threads 2a in other non-satin sections. It is in a floating state.

Therefore, as the weaving progresses, the warp yarns 2b gradually become looser than the other warp yarns 2a, and cannot follow the movement of the belt 9, which tends to result in poor shedding. but,
According to the control of the present invention, the tension of the satin portion, that is, the warp yarns 2b is controlled by the torque control and position control of the drive motor 23 by the loosening controller 20, so that the slack of the warp yarns 2b is prevented during the loosening control period. , is transmitted to the front of the weave along with beating, and the consumption amount of the warp yarns 2b becomes almost equal to the consumption amount of the other warp yarns 2a, and moreover, during the feeding tension control period, the tension of the warp yarns 2b is independently controlled without loosening. This eliminates opening defects, reduces jamming accidents, and improves operating efficiency. In this way, by controlling the loosening roll 7, the amount of slack in the warp yarns 2b is absorbed by the woven fabric, so even during a long weaving process, the warp yarns 2b do not become loose, and the warp yarns 2b are not loosened by other warp yarns. Since the same tension as 2a can be ensured, opening defects are eliminated and the vertical dead rate is reduced.

[Specific example of loosening controller 20] The loosening controller 20 shown in FIG. 3 is an example of a circuit in which torque control and position control are combined.

The rotation angle (crank angle) of the main shaft 19 is detected by the angle detector 21.
detected by. Since the angle detector 21 is also connected to the logic decoder 53, the logic decoder 5
3, the contact 56 is turned on during the feeding tension control period;
and the contact 59 is turned off, and during the loosening control period,
Contact 56 is turned off, contact 59 is turned on, and contacts 54, 55, 58, and 57 are turned on.

For loosening control, when the contacts 54, 57, 59 are switched on by the logic decoder at an initial predetermined angle during the closing operation before beating, that is, at a crank angle of, for example, 270°, The angle detector 21 operates the pulse oscillator 60. That is, the pulse oscillator 6
0 inputs the angle signal from the angle detector 21, and contacts 5
4.57.59 switched on state 270”
In order to rotate the drive motor 23 in the direction of loosening the warp threads 2b at an angle of Output and set it. Therefore, the output of the counter 64 is given to the drive motor 23, such as a servo motor, through a gain setter 66 for improving responsiveness, a summing point 75, an amplifier 68, a summing point 69, and a drive amplifier 70. As a result, the drive motor 23 rotates in the forward direction at the beginning of the closing operation before reed beating, thereby rotating the arm 24 in the counterclockwise direction in FIG. direction, and set the tension of the warp threads 2b in a lower direction. During this operation, the output of drive amplifier 70 is detected by current detector 72 and fed back to summing point 69 as a feedback signal. In addition, the drive motor 2
The rotational speed of 3 is detected by the tachogenerator 73 and sent as an electrical feedback signal to the summation point 7.
5 will be returned. Further, the rotation amount of the drive motor 23 is detected by the pulse generator 25, sent to the down input terminal of the counter 64 via the contact 57, and subtracted from the set value. Therefore, the count value of this counter 64 is "0".
'', the drive motor 23 rotates by the given amount of movement and automatically stops.

During the above-described loosening control period, the beating movement is completed, but during this period, the tension of the warp yarns 2b is set to be weaker than the tension during the feed tension control period. In this way, the warp threads 2b are set to a loose state in a short period of time from the time of closing the warp to the time of beating the reed, and the weft threads 3 contact the warp threads 2b in the closed state and are tightened to the front of the weaving. This ensures that any slack in the warp threads is transmitted to the front of the weave. When the beating is completed, that is, at an angle of 5 degrees in terms of crank angle, the logic decoder 53 turns on the contacts 55.58 instead of the contacts 54.57 while keeping the contact 59 on. Set. The pulse oscillator 61 is connected to the angle detector 2
1, and at an angle of 5 degrees at which the contacts 55 and 58 are switched on, the setting device 63 sends a pulse corresponding to the preset amount of movement in the backward direction to the rotational speed of the main shaft 19. is generated in proportion to and is given to the counter 65, so the output of the counter 65 passes through the gain setter 67, the contact 55, etc.
A drive amplifier 70 is provided. In this way, the drive motor 23 rotates in the reverse direction by a predetermined amount from the time when the beating is completed, and automatically stops when the count value of the counter 64 reaches "0".

This prepares for applying a predetermined tension to the warp threads 2b again.

After this, the feed tension control period starts, and only the contact 56 is set to the ON state by the logic decoder 53 at an angle of 20 degrees in terms of the crank angle, so the drive amplifier 70 is set by the tension setting device 18 The deviation between the calculated target tension and the detected tension from the tension detector 22 is input from the path of the addition point 74, the amplifier 71, and the contact 56,
By driving the drive motor 23 and applying a predetermined torque to the arm 24, the warp threads 2b are given tension necessary for thread handling during shedding motion. Here, the start time of the feed tension control period may be any time necessary to prevent opening defects during the next weft insertion, and may be later than the 20'' angle of this embodiment.

In this way, the torque control during the feed tension control period and the rotation amount control during the loosening control period are switched during one cycle,
In order to transfer the slack to the front of the weaving, the warp threads 2 are used before and after beating the reed.
b is loosened, and appropriate tension is applied to the warp threads 2b for shedding movement.

In this specific example, tension feedback is applied using the tension detector 22, but the tension detector 22 and the amplifier 71 may be omitted and oven loop type control may be performed.

In the specific example shown in Fig. 4, torque control is performed during the entire period.
This is an example of changing the tension to be lower than the target tension when loosening.

The contacts 56, 59 are set to the on/off state as in the example shown in FIG. 3 above. Then, during the relaxation control period, the target relaxation tension is determined by subtracting a predetermined constant from the target tension set by the tension setting device 18 using the subtractor 76.

Note that a constant for this subtraction is set by a constant setter 77. In this specific example as well, the tension detector 22 may be omitted and oven loop control may be used.

The specific example shown in FIG. 5 is an example in which the warp yarns 2b are controlled by oven loop torque control, and in addition to this control, position control of the second tension roll 6 is adopted.

The drive motor 23 of the loosening roll 7 is driven under open-loop torque control based on the target tension set by the tension setter 18 during the feeding tension control period, and during the loosening control period, the drive motor 23 is driven under open-loop torque control. At a nearby predetermined time, the tension setter 78 is switched to the target relaxation tension and controlled under torque control based on the lower tension.

On the other hand, the second tension roll 6 is configured to be freely changeable in position in the vertical direction via, for example, an arm 80 by rotationally controlling a motor 79 for changing the position. The pulse output of a pulse generator 81 connected to the drive motor 23 of the loosening roll 7 is distributed via a rotary pulse distributor 82 to an up or down input terminal of an up/down counter 83. The rotational pulse distributor 82 receives the rotational pulse signal and rotational direction signal from the pulse generator 81, and distributes the rotational pulse signal to the amplifier or down input terminal of the up/down counter 83 according to the rotational direction. . And up/down counter 83
The count value is converted into an analog signal by the DA converter 84, and is input to the drive amplifier 85 of the drive motor 79 via the contact 56. The drive amplifier 85 receives an input signal r
It is provided to drive the motor 79 so that OJ is achieved. Therefore, the motor 79 for changing the position of the second tension roll 6 is controlled to rotate so that the count value of the up/down counter 83 becomes zero. When the reset switch 86 is turned on when the tension state of the warp yarns 2a and 2b is appropriately adjusted at the initial stage of weaving, the up/down counter 83 is reset to rOJ. The rotation of the motor 79 for controlling the second tension roll 6 is controlled so that the position 7 is on the male side.

In the case of this embodiment, since the movement of the loosening roll 7 is canceled out, there is no adverse effect due to the inertia of the loosening roll 7 itself, and there is no back-and-forth movement of the loom 10, and the control is stabilized.

In the above embodiment, since the warp yarn 2b can be controlled by only the loosening roll 7, the second tension roll 6 may be omitted if it is fair.

〔Effect of the invention〕

In the present invention, in the process of fabricating satin striped fabrics,
The warp threads are reeled from one warp beam, and some of the warp threads with a small number of intersections and the remaining warp threads with a large number of intersections are applied to separate tension rolls. The warp threads are actively loosened during the unwinding period from the closing operation to the beating operation, and the tension is set lower than the tension in the C period other than the above period, so that the manufacturing w &
As C progresses, the consumption of all warp yarns becomes almost equal, which prevents loosening of warp yarns with a small number of interlaces such as in the satin section, eliminates shedding defects, and improves the operating rate of the loom.

[Brief explanation of drawings]

FIG. 1 is a schematic side view of a loom according to the method of the present invention, FIG. 2 is an explanatory diagram of the operation in each period, and FIGS. 3 to 5 are specific block diagrams of the loosening controller. 1...Loom, 2a, 2b...Warp, 3...Weft, 4
・Warp beam, 5 ・First tension, roll, 6
・・Second tension roll, 7・・Loosen roll, 12
・・Reed, 16・・Feeding controller, 17・・Tension detector, 18・・Tension setting device, 19・・Main shaft, 20・・Loosening controller, 21・・Angle detector, 22・・・Tension detector , 23
...Drive motor, 24...Arm. Patent applicant Tsudakoma Kogyo Co., Ltd. Agent
Person Patent attorney Kunio Nakagawa, 6 1 What's the history?゛Figure 19: Main shaft 21: Angle detector 22z Tension detector 23 = Drive motor 24: Arm diagram

Claims (4)

[Claims] (1) When weaving a satin striped fabric, etc., in which the weave structure is different in only a part in the width direction of the woven fabric, and the number of intersections of the warp yarns with the weft yarns in this part is smaller than in other parts, the warp yarns are let out from one warp beam, A part of the warp threads with a small number of intersections and the remaining warp threads with a large number of intersections are separated and wound around separate tension rolls, and the part of the warp threads with a small number of intersections are wound at least from the warp closing operation to the beating operation. A method for weaving satin striped fabric, etc., characterized in that the tension is actively loosened during a loosening control period, and the tension is set lower than the tension during a sending tension control period other than the loosening control period. (2) The satin striped fabric according to claim 1, wherein during the loosening control period, the tension of some of the warp yarns with a small number of interlaces is set to be lower by loosening the tension of the rolls in the weaving front direction. Weaving methods such as. (3) In the loosening control period, the tension of some of the warp yarns with a small number of crossings is set as a target relaxation tension lower than the target tension in the feeding tension control period. Weaving methods such as satin striped fabric. (4) The movement of the loosening roll is reduced by displacing the second tension roll in a direction that cancels the displacement of the loosening roll.
A method of weaving satin striped fabrics etc. as described in Section 1.