JPH09324343A - Weft tension application in fluid jet loom and scheme therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To properly and uniformly apply tension to a picked weft. SOLUTION: This method for applying tension to a weft, which is used in a fluid jet loom 10 designed to move a picking nozzle 18 for a weft 12 together with a reed 20, has such a scheme that the end of a picked weft 12 begins to be pulled by a relevant means 34 on the opposite yarn feed side, the weft 12 is held by a relevant means 36 on the opposite yarn feed side after a point when the weft 12 communicating with a length measurement reservoir 14 is moved to a cloth fell 22 as the reed 20 is advanced to effect that the path length of the weft comes to a minimum, and the pulling the weft 12 is continued by the means 346 at least until the weft 12 is held by the means 36.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weft tension applying method and apparatus in a fluid jet loom of a type in which a weft inserting nozzle moves together with a reed.

[0002]

2. Description of the Related Art In a jet loom, that is, a fluid jet loom 10 in which wefts are inserted by a fluid ejected from a nozzle, as shown in FIG. It is drawn through a weft insertion nozzle 18 through a guide member 16 such as a yarn guide or an auxiliary nozzle fixed to the frame of the loom, and is weft-inserted into the warp opening. In such a loom, when the weft insertion is completed, the transport force of the jet fluid to the weft disappears,
The leading end portion of the weft thread that has been wefted is in an unrestrained state. For this reason, the weft thread is rebounded, and the weft thread to be woven is in a low tension state.

As a result of the above, weft loosing occurs in the woven fabric or loosening of the ears of the woven fabric, or the tension of the weft yarn to be woven becomes uneven in the weft inserting direction. A problem occurs that the texture of the cloth becomes poor. As a means for solving such a problem, conventionally, a weft catching member or a tension applying member is provided on the anti-feeding side so that the weft is caught or a tension is applied to the weft when weft insertion is completed. .

However, in the case of a fluid jet loom of the type in which the weft insertion nozzle is attached to the sley and moves with the reed, in the process of moving the reed 20 to the cloth fell 22, the weft 1
Since the path length of No. 2 is changed, the weft is loosened. That is, as shown in FIG. 1A, when the weft insertion is completed, the weft insertion nozzle 18 is
6 is located on the side opposite to the cloth fell 22 in the direction of the warp yarns, whereas as the reed 20 is advanced to the cloth fell 22 side, as shown in FIGS. 1 (B), (C) and (D). As shown, it gradually moves to the side of the cloth fell 22.

For this reason, the path length of the weft 12 between the auxiliary nozzle 16 and the weft inserting nozzle 18 changes, and FIG.
The initial path length La of the weft 12 shown by the solid line in FIG.
There is a difference (La-Lc) between the shortest path length Lc of the weft shown by the broken line in (A) and the solid line in FIG. 1 (C). Such a path length difference causes the former La to be larger than the latter Lb, and therefore the looseness of the weft yarn 12 is temporarily generated during the movement process of the reed 20 to the cloth fell 22.

As described above, once the weft yarn is loosened during the reed movement, the weft insertion nozzle 18 is positioned on the cloth fell 22 side with respect to the auxiliary nozzle 16 in the warp direction as shown in FIG. 1 (D). Even if the weft yarn 12 is moved to, the weft yarn 12 is expanded again and the weft yarn 12 is stretched again, the tension of the weft yarn 12 is not uniform in the width direction of the woven fabric 26, and the texture of the woven fabric 26 to be woven is descend. In addition, when a yarn with a lot of fluff is used, the loose portion of the weft yarn may be caught by the warp yarn and may be woven into the woven fabric 26 without being loosened. Therefore, with the device for catching the weft or the device for applying tension to the weft at the end of weft insertion as described above, problems such as looseness of the weft and poor texture cannot be solved.

As one of the conventional techniques, it is attempted to apply tension to the weft while eliminating looseness of the weft by providing a pulling means on the anti-feeding side, which continues to pull the weft by the air flow from the time when the weft insertion is completed. There is something to do. However, since the pulling force by the airflow is not sufficient, the weft is pulled back from the pulling means when the path length of the weft becomes large in the course of the reed movement, and as a result, the tension of the weft varies. In the same manner as described above, a poor texture due to uneven tension occurs.

As one of other conventional techniques, a gripper for gripping the tip portion of the weft is arranged on the anti-feeding side, and the operation timing of the gripper is controlled according to the arrival timing of the weft so that the tension of the weft is controlled. There is one that stabilizes the temperature (Japanese Patent Laid-Open No. 3-241038). However, in this conventional technique, the gripping timing of the gripper only corresponds to the weft arrival timing based on the assumption that the weft arrival timing varies. It is almost always before the shortest. Therefore, even in this conventional technique,
It is not possible to prevent the looseness of the weft yarn from occurring once during the movement process of the reed, and it is not possible to inherit the above problems caused by this.

[0009]

DISCLOSURE OF THE INVENTION The present invention is to apply tension accurately and uniformly to a weft thread that has been weft-inserted.

[0010]

The present invention is applied to a weft tension applying method and apparatus for a fluid jet loom in which a weft insertion nozzle for weft moves together with a reed.

In the weft tension applying method of the present invention, the end of the weft put in the weft is started to be pulled by the pulling means on the anti-feed side, and the weaving reed is connected to the length measuring and storing device. The weft yarn is gripped on the side opposite to the yarn feeding side by the gripping device after the shortest path length of the weft yarn by the movement to, and the traction device continues to pull the weft yarn at least until it is gripped by the gripping device. including.

Further, the weft tension applying device of the present invention comprises a pulling means for pulling the end of the weft on the anti-feed side, a gripping means for gripping the end of the weft on the anti-feed side, and a length measurement storage. The gripping means is driven after the time when the path length of the weft becomes the shortest due to the movement of the weft thread connected to the device to the weaving front with the forward movement of the reed, and the weft thread is gripped by the gripping means at least from the end of weft insertion. Drive control means for operating the traction means until

The weft yarn, which has been put in the weft, is pulled by the pulling means at the end portion on the side opposite to the yarn feeding side until at least the tip end portion is held by the holding means. Therefore, the pulling means absorbs the difference in the weft path length that occurs when the weft portion inserted into the shed of the warp moves to the cloth fell side as the reed moves. Further, the gripping of the weft by the gripping means is performed after the time when the weft-inserted weft has the shortest path length. Therefore, after the gripping means grips the weft, since the path length of the weft only increases, the looseness of the weft does not occur.

As described above, according to the present invention, the end portion of the weft yarn is pulled by the pulling means on the anti-feeding side,
The weft is moved together with the reed to the front side, and the end of the weft is gripped on the anti-feeding side after the path length becomes the shortest. It is applied and struck before weaving without causing slack.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, a fluid jet loom 10 is an air jet loom. Weft 12
Is supplied to a main nozzle, that is, a weft inserting nozzle 18 via a drum type length measuring and storing device 14 and an auxiliary nozzle 16.

The nozzles 16 and 18 are connected to a common compressed air supply source. Air from the compressed air supply is supplied to nozzles 16 and 18 via a common or separate valve mechanism. The weft inserting nozzle 18 is fixed to a sley (not shown), and is therefore moved to the cloth fell 22 side together with the reed 20 during beating.

On the yarn supplying side, a yarn guide 30 for guiding the weft 12 drawn out from the length-measuring storage device 14, and a pullback device 32 for returning the weft-inserted weft yarn are arranged in the order of length-measuring storage device 14 and auxiliary nozzle 16. It is located between. On the other hand, a pulling device 34 for pulling the front end side of the weft inserted and a gripping device 36 for gripping the front end portion of the weft yarn are arranged in that order on the anti-feeding side. In the illustrated example, the pullback device 32 is additionally provided so that a higher tension can be applied to the weft yarn 12. However, the pullback device 32 is not always necessary and, for example, the tension applied to the weft yarn 12 is not so great. It may not be provided if it is not necessary to raise it.

The pulling-back device 32 bends the weft 12 to pull back the weft portion inserted into the opening of the warp 24 toward the yarn supplying side. The pulling device 34 pulls the front end portion of the weft yarn 12 toward the anti-feeding side by sucking the front end portion of the weft yarn 12 by suction means such as a stretch nozzle. The gripping device 36 grips the front end portion of the weft with the weft being bent.

During length measurement, the weft yarn 12 is measured with the weft yarn being prevented from being unwound from the length measurement and storage drum by a locking pin operated by an electromagnetic solenoid of the length measurement storage device 14. When the yarn guide of the storage device 14 is rotated a predetermined number of times, the yarn is wound around the outer peripheral surface of the drum for length measurement and storage for a predetermined length and stored.

At the time of weft insertion, the weft 12 is measured and stored by the measuring and storing device 14.
When released from the length measuring and storing drum by releasing the locking pin of No. 3, the weft insertion nozzle 18 jets the liquid together with the fluid, so that the weft is inserted into the opening of the warp 24, and the tip end is on the non-feeding side. After reaching, the leading end is pulled by the pulling device 34.

The part of the weft 12 in which the weft is inserted into the opening of the warp 24 (hereinafter referred to as "weft part") is the reed 2
It is moved toward the cloth fell 22 together with 0, and is finally struck on the cloth fell 22. In the process of this beating,
The weft yarn 12 is advanced with its tip portion pulled by the pulling device 34, and when the weft insertion nozzle 18 reaches the position shown in FIG. 1 (C) or at an appropriate time until the beating is finished, The leading end portion of the weft yarn 12 is gripped by the gripping device 36, and at the same time or subsequently thereto, the pulling-back device 32 pulls back the yarn to the yarn feeding side.

Therefore, the weft yarn portion is tensioned by the pullback device 32 and the holding device 36 bending in addition to the increase in the path length of the weft yarn 12 accompanying the movement of the weft yarn portion after gripping. Struck at 22. After beating, the weft 12 is cut by a cutter (not shown), and the weft portion is separated from the portion connected to the length measurement storage device 14. As a result, the weft portion is also released from the pullback device 32.

The weft 1 is pulled by the pulling device 34.
It is assumed that the tip of the second end is stopped at an appropriate time after the time when it is gripped by the gripping device 36. Also, the gripping device 3
The grip of the weft yarn 12 by 6 shall be released immediately before or after the beating.

As described above, the pulling device 34 pulls the weft yarn inserted therein at least until the gripping device 36 is activated. On the other hand, the pullback device 32 starts its operation after the time when the weft yarn path length becomes the shortest, and continues the operation at least until the time when the weft yarn 12 is restrained by the warp yarn 24 immediately before the beating. For this reason, the weft part is reed 2
There is no slack in the movement to the side of the cloth fell 22 with the movement of 0. Therefore, tension is accurately and uniformly applied to the weft portion.

Further, as described above, in the illustrated example, the gripping device 36 grips the weft yarn 12 in a bent state outside the woven fabric edge on the side opposite to the yarn feeding side. Therefore, the gripping device 36
This bending causes the weft portion to exert a force pulling it toward the anti-feeding side. As a result, the pulling-back device 32 and the gripping device 36 exert a traction force on the weft yarn portion from both sides thereof, and cooperate with each other to positively act the tension on the weft yarn portion. At the time of gripping by the gripping device 36, the end portion of the weft 12 is pulled into the traction device 34 and is restrained. Therefore, the weft yarn pulled by the gripping device 36 is located on the yarn supplying side with respect to the position of the gripping device 36. Therefore, the amount of bending by the gripping device 36 becomes the amount of pulling of the weft yarn 12 to the opposite yarn feeding side as it is, and stable tension application is performed.

When the tension is applied to the weft by pulling the weft from both sides as described above, the work of applying the tension to the weft is shared by the pullback device 32 and the gripping device 36, so that an appropriate tension is applied to the weft. It can be applied uniformly over the entire effective length range. Further, since the time required for applying the tension can be shortened and the time for one weft insertion can be shortened, the invention can be applied to a high-speed loom and the consumption of the weft insertion fluid can be reduced. Further, since the amount of traction per unit time increases, the present invention can be applied to a wide loom. The total effective length range is at least the range between the edges of the fabric and at least the range of the width of the finished fabric.

As a result of the above, an appropriate tension is applied uniformly, quickly and reliably over the entire effective length range of the weft-inserted weft. Therefore, even in a high-speed loom or a wide loom, weft loosening or loosening does not occur in the weft, and there is no possibility that the weft is woven into the woven fabric in a state in which the weft has a difference in tension between the yarn supplying side and the anti-feeding side.

In the above, the operating periods of the pulling device 34, the pulling device 32, and the gripping device 36 are set in accordance with the type of yarn to be used, the weaving pattern, etc., and the weft insertion period and the beating timing set in accordance with the weft insertion period. It is set in advance as timing relating to the rotation angle of the main shaft. The pullback amount of the weft yarn by the pullback device 32 and the bending amount of the weft yarn by the gripping device 36 are also set in advance in accordance with the type of the yarn used, the weaving pattern, and the like. Any of these values can be determined from preliminary test weaving, experience, and the like.

For example, when the weft insertion period is set between 70 and 230 degrees and the repulsion is set at 0 degree (360 degrees), the pulling device 32 is operated during the operation period of the pulling device 34 from the start of the weft insertion. It can be between 180 and 280 degrees until after 36 has begun to operate. Further, the operation period of the pullback device 32 and the gripping device 36 can be set to, for example, 260 to 360 degrees when the shortest angle of the weft path is 260 degrees. These timings are the timings that are optimally determined by previously determining the arrival timing of the weft by a test or the like.

In the above description, the operation timings of the pullback device 32, the traction device 34 and the gripping device 36 are fixed timings which are set in advance, but instead of this, they may be timings corresponding to the actual weft inserting state. . For example, a detection signal of a sensor that detects that the tip of the weft has reached a predetermined position, a detection signal of a sensor that detects that the weft has been released by the length measurement storage device 14, a release command signal in the length measurement storage device 14, and a weft. The pullback device 32 and the traction device 3 are based on the weft insertion command signal in the insertion device.
4 and a signal to activate the gripping device 36 may be generated. Alternatively, a plurality of timings may be set, and one of them may be selected according to the type of yarn. The latter case is suitable for a multicolor loom.

The operation timings of the pullback device 32 and the gripping device 36 may be substantially the same, or the gripping device 36 may be operated before the pullback device 32.
That is, the pulling-back device 32 may start pulling back after the weft yarn is captured by the holding device 36 on the side opposite to the weft feeding side. Alternatively, the pullback device 32 may be operated before the gripping device 36 in the reverse order. In either case, the gripping device 36 starts its operation at an appropriate time when the path length of the weft becomes the shortest or after that, before the beating is completed.

In the illustrated example, the pullback device 32 is arranged between the auxiliary nozzle 16 and the guide 30. However, if the pullback device 32 is located between the length measurement storage device and the yarn end on the yarn feeding side, another You may arrange in a place. Similarly, the gripping device 36 is arranged between the reed 20 and the traction device 34 in the illustrated example, but if it is outside the woven fabric end on the non-feeding side, it may be arranged at another place. Good.

In the multi-color weaving machine which selectively uses a plurality of wefts, the length measuring and storing device 1 having the same number as the number of wefts to be used is used.
6, a guide 30, a pullback device 32, an auxiliary nozzle 16 and a weft insertion nozzle 18 are provided. However, the traction device 34 and the gripping device 36 are commonly used. In this case, it is preferable to change the amount of pulling by the pulling device 34 and the amount of bending by the gripping device 36 according to the type of yarn and the like.

An embodiment of the pullback device 32 is shown in FIGS. The pullback device 32 includes a drive source 40 capable of controlling the angular rotational position of the rotor like a pulse motor,
Fixed arm 42 made of a linear member bent in a U shape
And a movable arm 44 that is displaced by the drive source 40 to bend the weft 12 in cooperation with the fixed arm 42.

The drive source 40 is attached to a bracket 46, which is an elongated plate member curved in an L shape, by a plurality of screw members. The output shaft of the drive source 40, that is, the rotation shaft 48
Penetrates the bracket 46 rotatably. The fixed arm 42 is fixed to a plate-shaped mounting member 50, and the movable arm 44 is fixed to a rotating shaft 48 via a mounting member 52.

The mounting member 52 is attached to the rotary shaft 48 so that the movable arm 44 extends in a direction orthogonal to the rotary axis of the rotary source 40 and swings across a line parallel to the rotary axis of the rotary source 40. And is provided by the drive source 40 with an angular reciprocating rotational movement about the axis of rotation of the drive source 40. The movable arm 44 is formed of a linear member bent in a U-shape, and is attached to the mounting member 52 such that two portions of the linear member are spaced from each other in the direction of the rotation axis of the drive source 40.

In the bracket 46, the rotation axis of the drive source 40 is in the flight direction of the weft yarn 12, and the movable arm 44 is the weft yarn 1.
2 and is indirectly assembled to the frame of the loom by a plurality of screw members so that the two portions of the linear member of the movable arm 44 are spaced apart in the flight direction of the weft 12. Can be The mounting member 50 is configured so that the fixed arm 42 extends between the two members of the movable arm 44 and the weft 12
Is indirectly fixed to a frame of a loom via a bracket or the like so that the airplane travels between two members of the fixed arm 42.

When the power of the loom is not turned on, the movable arm 44 is positioned at a position corresponding to the mounting position of the pullback device 32 (in the illustrated example, so that the movable arm extends downward from the mounting member 52 by its own weight). It is rotationally moved by its own weight to the position indicated by reference numeral 44a). When the power of the loom is turned on, the drive source 40 is normally rotated to an initial position (position shown by reference numeral 44b) where the movable arm 44 contacts the mounting member 50, and then is rotated by a constant angle α. As a result, the movable arm 44 is rotationally moved to a reference position (position indicated by reference numeral 44c) above the weft 12 and is maintained at the reference position.

While the power of the loom is turned on, the drive source 4
0 is reversed by the angle θ each time a reverse rotation command is generated, and is rotated normally by the same angle θ each time a normal rotation command is generated. As a result, the movable arm 44 moves to the reference position (reference numeral 4).
4c), the movable arm portion 44 cooperates with the fixed arm 42 to bend the weft yarn 12 (actual position 44d).
Position) and vice versa. Weft 12
When the movable arm 44 is rotated from the reference position to the actuated position, the arm 42, 44 is acted upon by the joint action of the arms 42, 44 so as to be pulled back by a U-shape, thereby receiving a tension.

An embodiment of the traction device 34 is shown in FIG. The traction device 34 includes a stretch nozzle 60 and a pipe 62 that connects the suction side of the stretch nozzle to a compressed air source (not shown). The stretch nozzle 60 has a suction port 64.
Is attached to a lead holder 66 for the reed 20 so as to face the front end of the weft yarn 12 in which the weft has been inserted.

The compressed air supplied to the stretch nozzle 60 flows through the stretch nozzle 60 from the suction side to the discharge side and is discharged from the discharge port 68. Therefore, the traction device 34 is configured so that the compressed air is stretched for a predetermined period of time by the stretch nozzle 60.
And is flowed through the stretch nozzle 60 to suck the tip of the weft 12 from the suction port.

An example of the gripping device 36 is shown in FIGS. The gripping device 36 is held by a lead holder 66 that supports the reed 20. The reed holder 66 has a reed 2
0, the pulling device 34 and the gripping device 36, a weft detecting device 70 for detecting the front end of the weft inserted in the opening of the warp is held. The weft yarn detecting device 14 is attached to the lead holder 66 by a screw member 76 such as a bolt so that the sensing portion is located between the fabric end 72 on the non-feeding side, that is, the woven fabric end 72 and the discarding selvage 74. .

The gripping device 36 has a lower end portion provided with the lead holder 6
6 and a pair of first bending means or arms 82 spaced in the flight direction of weft 12, that is, the weft inserting direction.
And a second bending means or arm 84 arranged above both first arms 82, and a drive source 86 for angularly rotating the second arm 84 within a predetermined range.

The bracket 80 is formed in the recess 7 in the illustrated example.
8 and one or more screw members 90 such as bolts penetrating the lead gripper and screwed into the lead holder 66.
It is immovably assembled so as to extend upward.
However, the bracket 80 may be directly attached to the lead holder 66 by one or more screw members, or may be attached to the frame of the loom via a bracket or the like. However, when mounting to the frame, the mounting position is fixed, so
It is necessary to install the timing at which the weft yarn, which has moved together with the reed, reaches between the upper and lower contact portions of the gripping device 36 at the gripping timing in the present invention.

The bracket 80 has a hole through which the weft thread 12 penetrates in the flight direction and a notch for communicating the hole with the upper part thereof, and the drive source 86 is immovably supported in the hole. There is. The drive source 86 is a pulse motor, and its rotation shaft, that is, the output shaft 92 is sandwiched in the hole of the bracket 80 so as to extend in the weft inserting direction, and is moved to the bracket 80 by one or more screw members 94 such as bolts. It is installed improperly.

The first arms 82 are both first arms 82.
A pair of collars 96 arranged between them and both first arms 8
2 and a pair of screw members 98 such as bolts penetrating through the collar 96 and screwed into the screw holes 80a of the bracket 80.
Thus, they are immovably attached to the bracket 80 at the two lower portions. Both first arms 82 are formed by plate members and extend parallel to each other.
Each of the first arms 82 has a first contact portion 100, which extends below the flight path of the weft 12 in a direction intersecting the weft inserting direction, at an upper portion thereof. Both first contact portions 100 extend in parallel to each other with a space in the weft inserting direction.

The second arm 84 is formed of a plate member. The second arm 84 is attached to the output shaft 92 of the drive source 86 so as to extend in a direction intersecting the weft inserting direction in parallel with both the first arms 82 in a plan view. It is immovably mounted. Second arm 8
4 has a second contact portion 102, which extends above the flight path of the weft yarn 12 in a direction intersecting the weft insertion direction, at the tip portion.

The second arm 84 is normally maintained at a position where the second contact portion 102 is above the flight path of the weft 12, as shown in FIG.

At the time of weft insertion, the weft thread 12 moves into the second arm 84.
Is displaced as shown in FIG. 5, the weft yarn 12 is weft-inserted into the shed of the warp so that the tip of the weft yarn 12 reaches between the first contact portion 100 and the second contact portion 102.

After the weft insertion is completed, the front end of the weft 12 is the first
When it reaches between the contact portion 100 and the second contact portion 102, the second contact portion 102 crosses the flight path of the weft 12 and reaches between the first contact portions 100. The arm 84 is rotated by the drive source 86 in the clockwise direction (the direction indicated by the arrow 104) in FIG. 5 by a predetermined angle. as a result,
The tip of the weft 12 is gripped or captured by both the first contact portion 100 and the second contact portion 102, and is bent into a substantially U shape by the contact portions 100 and 102.

The bending of the weft 12 by the gripping device 36 acts on the weft 12 as a force to pull the weft 12 toward the gripping device 36. Since the weft 12 is grasped and bent by the pullback device 32 on the weft insertion side, that is, the yarn feeding side as described above, the pulling force is the tension to be applied to the weft 12 together with the pullback force by the pullback device 32. Become.

Next, the weft yarn 12 is moved to the front side of the weave as the reed 20 moves forward, and the weft portion of the weft yarn 12, which has been inserted into the opening of the warp, is struck by the reed 20 at the front side of the weave. The yarn is cut from the yarn supplying side by a cutter (not shown). In the gripping device 36, the drive source 86 is reversed by a predetermined angle immediately before the beating, at the same time as the beating, or at an appropriate time after the beating, and the second contact portion 1
The weft 12 is released by returning 02 to above the weft flight path.

The gripping device 36 has a plurality of pairs of collars 9 having different lengths in order to change the gripping force applied to the weft.
6 is provided. To change the gripping force, remove the screw member 98 from the bracket 80, and use the collar 96 that has been used until then.
Is replaced with another collar 96 having a different length dimension, and both first arms 82 are screw members 98 and a newly selected collar 96.
It is carried out by attaching to the bracket 80 by and.

When the collar 96 is replaced with another collar having a different length, the distance between the first arms 82 and the distance between the first arms 82 and the second arms 84 are changed. The distance between the first contact portions 100 and the distance between the first contact portions 100 and the second contact portions 102 are changed, and as a result, the gripping force acting on the weft is changed. For such selection of the interval, for example, a collar having a predetermined length dimension may be selected in advance so that the interval becomes large for a thick weft and the interval becomes small for a thin weft.

A plurality of thin plate-like members each having a through hole or a plurality of thin annular members are coaxially overlapped to form a collar, and both first contact portions 1 to be set.
You may make it change the number of those members used according to the space | interval between 00. By doing so, it is not necessary to prepare colors having different lengths in accordance with the intervals to be set, and the adjustable range can be expanded.

As described above, the second arm is connected to the pair of first arms.
Instead of being placed above the arm of this, it may be placed in reverse. That is, the pair of first arms may be arranged above the weft flight path, and the second arm may be arranged below the weft flight path. In this case, the rotation direction of the second arm is opposite to the arrow 104 in FIG. Also, instead of displacing the second arm with respect to the first arm, the first arm may be displaced with respect to the second arm, or both the first and second arms may be displaced. Is also good.

FIG. 7 shows an embodiment of the drive controller 110. The drive control device 110 includes a pulse motor as a drive source 86 in the gripping device 36 shown in FIGS. 4 to 6, and a flow path of high-pressure air or compressed air for supplying high-pressure air or compressed air to the stretch nozzle 60 of the traction device 34. The solenoid valve 112 for opening and closing is controlled.

The drive controller 110 includes a drive controller 114.
A drive source, that is, a motor drive unit 116 that rotationally drives the pulse motor 86, and an electromagnetic valve drive circuit 118 that drives the electromagnetic valve 112.

The drive controller 114 includes a pulse motor 86.
The drive timing for driving the timing setter 120
And the drive timing for driving the solenoid valve is set in the timing setter 122. The drive timing set in both setters 120 and 122 is a value corresponding to the rotation angle of the main shaft 124 of the loom, and is manually set in advance based on a preliminary test or an empirical rule. For example, the drive timings set in the setters 120 and 122 are 260 to 360 degrees and 180 to 180 degrees, respectively.
It can be 280 degrees.

The drive timings set in the setters 120 and 122 are the comparators 126 and 128, respectively.
At, it is compared with the signal from encoder 131.
The encoder 131 generates a signal corresponding to the rotation angle of the main shaft 124. The comparators 126 and 128 are the setters 12 to which the output signals of the encoder 131 correspond, respectively.
Commander 1 while the values set in 0 and 122 match
It outputs a signal to 32 and 134.

The commanders 130 and 132 are respectively
While the signals are being supplied from the corresponding comparators 126 and 128, the drive command signal is supplied to the corresponding motor drive circuit 116 and solenoid valve drive circuit 118. Each drive command signal is a rectangular wave signal that is at a high level while the signals are supplied from the corresponding comparators 126 and 128.

The motor drive unit 116 includes a pulse motor 8
The target rotation amount for rotating 6 is the target rotation amount setter 1.
34 is set. The target rotation amount set in the target rotation amount setting unit 134 is a value corresponding to the number of pulses to be supplied to the pulse motor 86, and is supplied to the rotation pulse generator 136 as a target rotation amount signal.

The rotation pulse generator 136 is the commander 130.
The drive command signal supplied from the set commander 1 is received at each of rising and falling of the drive command signal.
The number of pulse signals corresponding to the value set in 34 is supplied to the polarity inverter 138.

The polarity reversing device 138 receives the drive command signal supplied from the command device 130, inverts the polarity of the pulse supplied from the rotation pulse generator 136 at the fall of the drive command signal, and supplies it to the motor driver 140. Output.
The motor driver 140 drives the pulse motor 86 according to the number and polarity of the pulses supplied from the polarity inverter 138.

More specifically, when the positive pulse is supplied from the polarity inverter 138, the motor driver 140 outputs the pulse motor 86 by the number of steps corresponding to the positive pulse.
When the negative pulse is supplied from the polarity inverter 138, the pulse motor 86 is reversely rotated by the number of steps corresponding to the number of the negative pulse. The pulse motor 86 is normally or reversely rotated by the number of pulses depending on the polarity of the supplied pulse.

When the pulse motor 86 is normally rotated by a predetermined number of steps, the second arm 84 of the gripping device 36 shown in FIGS. 4 to 6 is normally rotated from the standby position. Therefore, when the pulse motor 86 is normally rotated by the target rotation amount, the second arm 84 of the gripping device 36 is normally rotated by the angle corresponding to the target rotation amount and moves from the standby position to the target position. By this, the weft is bent by the amount corresponding to the target rotation amount,
Tension T acts on the weft.

When the pulse motor 86 is rotated in the reverse direction, as shown in FIG.
The second arm 84 of the gripping device 36 shown in FIG. 6 is reversed from the target position. Therefore, when the pulse motor 86 is rotated in the reverse direction by the target rotation amount, the second arm 84 of the gripping device 36 is rotated in the reverse direction by the angle corresponding to the target rotation amount and returns from the target position to the standby position. The gripping device 36 is released.

The solenoid valve drive circuit 118 energizes the solenoid valve 124 while the drive command signal is supplied from the command unit 132. The solenoid valve 124 opens the passage of the compressed air while being energized by the solenoid valve drive circuit 118, whereby the compressed air is supplied to the stretch nozzle 60 shown in FIG.

The pullback device 3 shown in FIGS. 2 to 7 described above.
2, one embodiment of a weft tension applying method using the pulling device 34 and the gripping device 36 will be described.

First, when the rotation angle of the main shaft 124 approaches 90 degrees with the rotation of the main shaft 124, weft insertion is started and the weft 12 is ejected from the weft insertion nozzle 18 together with the weft insertion fluid.

Next, when the rotation angle of the main shaft 124 approaches 180 degrees, the electromagnetic valve 112 of the traction device 34 starts to operate. As a result, the compressed air is transferred to the stretch nozzle 60.
Begins to be supplied to.

Then, when the rotation angle of the main shaft 124 becomes around 230 degrees, the tip of the weft 12 reaches the non-feeding side and is detected by the weft detector 70. As a result, the so-called weft insertion for inserting the weft 12 into the opening of the warp 24 is completed. At this point, the compressed air has already been compressed by the stretch nozzle 6
Since the weft yarn 12 is supplied to 0, the tip portion of the weft yarn 12 is sucked by the stretch nozzle 60, and the weft yarn 12 is pulled to the anti-feeding side.

Next, as the reed 20 moves forward,
The weft yarn 12 and the weft inserting nozzle 18 are moved to the cloth fell 22 side. When the rotation angle of the main shaft 124 becomes around 260 degrees, the path length of the weft 12 becomes shortest.

At the timing when the path length of the weft yarn 12 becomes the shortest, the gripping device 36 starts its operation and grips the weft yarn 12 in a bent state. Simultaneously with or after the gripping device 36 starts the operation, the pulling-back device 32 starts the operation and pulls the weft 12 back to the yarn supplying side. At this time, even if the weft yarn 12 is bent by the gripping device 36, the leading end of the weft yarn 12 is pulled by the pulling device 34.
The tip end side of 2 is not pulled back to the yarn feeding side. Therefore, the pulling force can be surely applied to the weft portion from both sides to apply tension.

The timing at which the gripping device 36 starts its operation is from when the path length of the weft yarn 12 becomes the shortest.
It is possible to set an appropriate time until the weft 12 is restrained by the warp 24, and the timing at which the pullback device 32 starts its operation can be set in accordance with the above timing.

After that, the weft portion is advanced together with the reed 20 while the weft yarn 12 is restrained on the yarn supplying side.
The path length of No. 2 gradually increases, whereby tension is further applied to the weft portion. The amount of bending of the weft yarn 12 by the gripping device 36 and the amount of pullback by the pullback device 32 are set to appropriate values according to the tension value to be applied to the weft yarn.

Next, when the rotation angle of the main shaft 124 approaches 280 degrees, the electromagnetic valve 112 of the traction device 34 stops its operation. As a result, the supply of compressed air to the stretch nozzle 60 is stopped.

Next, when the rotation angle of the main shaft 124 becomes 360 degrees, the weft portion inserted into the opening of the warp 24 is
It is struck by the reed 20 on the weave 22. At the same time, the drive source 4 for the pullback device 32 and the gripping device 36
0 and 86 are reversed and the weft 12 is released.

Thereafter, the above steps are carried out every time the main shaft 112 makes one revolution, and weft insertion and beating are carried out.

As the drive sources 46 and 86, rotary actuators such as pulse motors, servomotors and rotary solenoids can be used.

If a pulse motor is used as a drive source, by changing the number of pulses supplied to the pulse motor,
Because the stroke of the arm changes, the adjustment of the stroke of the arm is easy, the adjustment of the gripping force of the weft is easy, and it can be applied to weak yarns. No delicate parts or multi-core cables are required. There are advantages such as being less likely to break down even when attached to a movable part.

On the other hand, when a rotary solenoid is used as a drive source, the stroke of the arm cannot be adjusted during operation, making it difficult to adjust the stroke of the arm and the gripping force of the weft thread. However, there is a problem that thread breakage occurs when the thread is weak. In addition, when a servomotor is used as a drive source, a delicate encoder is required because the feedback control is fundamental, the number of required cables increases, and a failure occurs when the cable is attached to a portion with high vibration. There's a problem.

The holding means is the holding device 3 shown in FIGS.
Instead of No. 6, like the weft yarn end catching device described in Japanese Patent Publication No. 2-43903, the weft yarn is gripped in a bent state by a pair of adjoining reed blades and a catching plate that goes in and out between the reed blades. You may use the thing. Further, instead of the above-described device that holds the weft in a bent state, a device having only a holding function, such as a clamper including a pair of holding bodies, may be used.

Instead of rotating the arm like the gripping device 36, the arm may be moved linearly. Also,
Instead of using a rotary drive source as the arm driving means, a reciprocating drive source in which the mover moves linearly like a linear motor may be used. Furthermore, instead of assembling the gripping device to the lead holder with a bracket,
It may be assembled to the lead holder or other parts of the loom such as the frame by other means.

Instead of using a traction device using stretch nozzles as the traction means as shown in FIG. 4, a device using a suction nozzle connected to a suction pump may be used. Further, instead of the one that is pulled by the airflow as described above, a device using a pair of rollers set at an interval that does not completely exert a gripping force on the weft, or a roller provided on the surface with a brush or the like. A device that applies a traction force to the weft without exerting a complete gripping force, such as a device including an air injection pipe that injects an airflow toward the roller, may be used.

In the above description, the gripping means is arranged between the woven fabric end on the non-feeding side and the pulling means, but is pulled by the traction means outside the woven fabric end on the non-feeding side. It may be arranged at another position as long as it can hold the weft.
For example, if the traction means is an ejector type stretch nozzle, it can be arranged outside the traction means. Further, the gripping means may be provided inside the pulling means.

The present invention can be applied not only to a weaving machine for single-color weft insertion, but also to a weaving machine for multi-color weft insertion. In this case, a plurality of target rotation amounts can be set, one of the target rotation amounts is selected by a weft selection signal input to the rotation pulse generator, and the drive source is controlled based on the selected target rotation amount. Is preferred.

[Brief description of drawings]

FIG. 1 is a diagram for explaining an embodiment of a fluid jet loom equipped with the weft tension applying device of the present invention and its operation.

FIG. 2 is a perspective view showing an embodiment of the pullback device in the loom of FIG.

FIG. 3 is a left side view of the pullback device of FIG.

FIG. 4 is a front view showing an embodiment of the traction device and the gripping device in the loom of FIG.

FIG. 5 is a sectional view taken along the line 5-5 in FIG. 4;

FIG. 6 is a cross-sectional view taken along line 6-6 of FIG.

FIG. 7 is a block diagram of an electric circuit showing one embodiment of a drive control device.

[Explanation of Codes] 10 Loom 12 Weft 14 Measuring Length Storage Device 16 Auxiliary Nozzle 18 Weft Inserting Nozzle 20 Reed 22 Weaving Front 24 Warp 26 Woven Fabric 32 Pullback Device 34 Traction Device 36 Grasping Device

Claims (2)

[Claims] 1. A weft tensioning method for a fluid jet loom in which a weft insertion nozzle for a weft moves together with a reed, wherein the weft-inserted end of the weft is pulled by a pulling means on the anti-feeding side. The weft yarn is started to be gripped by the gripping means on the side opposite to the yarn feeding side after the time when the weft yarn path length becomes the shortest due to the forward movement of the reed yarn of the weft yarn connected to the length measuring and storage device, and at least the above A weft tension imparting method for a fluid jet loom, which comprises continuing the pulling by the pulling means until the weft is gripped by the gripping means. 2. A weft tension applying device for a fluid jet loom, in which a weft insertion nozzle for the weft moves together with the reed, and a pulling means for pulling an end of the weft on the side opposite to the weft supply; The gripping means for gripping the end portion on the side opposite to the yarn feeding side, and the gripping means after the time when the path length of the weft becomes the shortest due to the movement of the weft yarn connected to the length measuring and storing device to the weave before the forward movement of the reed. A weft tension applying device for a fluid jet loom, comprising: a drive control means that drives the weft thread at least from the end of the weft insertion until the weft thread is gripped by the gripping means.