JPH0874144A - Apparatus for nipping weft yarn end - Google Patents

Abstract

PURPOSE: To prevent a weft yarn from slipping off and separating from a nipping mechanism following the weaving shrinkage in an apparatus for nipping an weft yarn end, installed between a weft yarn cutter and a woven fabric end and having the nipping mechanism capable of nipping the end of the weft yarn beaten by a reed. CONSTITUTION: This apparatus for nipping a weft yarn end is obtained by installing at least weft yarn nipping members 7 and 11 of a nipping mechanism so as to follow up to the weaving shrinkage following the retreat of a reed 29 and enable the movement to the inside, further move to the outside in advancing the reed 29 and return to the original position. The weft yarn nipping members follow up to the weaving shrinkage and move to the inside even when the width of the woven fabric is reduced by the weaving shrinkage in retreating the reed and the weft yarn is pulled to the inside. Thereby, the weft yarn is not removed from the nipping members.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weft yarn end clamping device, and more particularly to a clamping mechanism provided between a weft cutter and a fabric end for clamping the repulsed weft end portion. The present invention relates to an improvement in a weft thread holding technique in a provided weft thread end holding apparatus. In this specification, the weft insertion nozzle side is referred to as “outside” and the opposite side is referred to as “inside”.

[0002]

2. Description of the Related Art Weft yarn end clamping devices of the type described above include those disclosed in Japanese Patent Laid-Open No. 54-156861, Japanese Patent Laid-Open No. 1-2221552, and Japanese Utility Model Laid-Open No. 11-19080.

In the one disclosed in Japanese Patent Laid-Open No. 54-156861, an upper holder made of an elastic material is brought into pressure contact with a lower holder to sandwich a weft yarn between the two holders. JP-A-1
In the one disclosed in No. 221552, a weft thread is held between a linear holding piece made of a hairpin curved wire and a plate-shaped holder. In addition, actual Kaihei 1-11
In the device disclosed in No. 9080, a holding force applying member, which is also a hairpin curve wire, is fitted in the groove of the fixed blade of the weft cutter to hold the weft.

[0004]

When a weft yarn is inserted into the warp yarn opening and beaten, the formed fabric shrinks in the width direction due to the shrinkage of the weft yarn caused by the intersection with the warp yarn, and the width of the reed yarn is reduced. It becomes narrower than the through width and so-called weaving shrinkage occurs.

When the reed moves most forward in the process of beating,
The woven fabric has a maximum width corresponding to the reed width, and the cloth fell approaches the holding mechanism. However, as the reed starts to retract, the width of the fabric is reduced due to the above-mentioned shrinkage of the fabric, and the weft is separated from the pinching mechanism.

The holding member of the weft holding mechanism holds the weft near the timing when the reed is most advanced, and then the weft is cut by the cutter. Therefore, the weft thread is in a state of extending between the holding member and the cloth fell. As the reed reed begins to recede, the width of the fabric decreases as described above,
The weft is pulled by the cloth fell and comes out of the holding member and comes off. As a result, there is a problem in the quality of the fabric that the edges of the fabric are loosened and the selvage tissue is not tight.

An object of the present invention is to provide a weft yarn end holding device having a holding mechanism provided between a weft cutter and a woven fabric end for holding the end portion of the repulsed weft yarn. It is to prevent the slipping out of the holding mechanism.

[0008]

Therefore, according to the present invention, at least the weft holding member of the holding mechanism can be moved inward in accordance with the shrinkage of the reed due to the retreat of the reed and is moved outward when the reed is advanced. The main point is that it is installed so that it will return to its original position.

[0009]

When the weft is retracted when the reed is retracted and the weft is pulled inward when the reed is retracted, the weft holding member also moves inward following the weaving, so that the weft does not come off from the holding member.

[0010]

1 and 2 show an example of a holding device according to the present invention, in which a combination of an elastic material (grip wire) and a plate material (grip plate) is used as a holding member, and these holding members are arranged vertically. The shaft is provided so as to be rotatable in the horizontal direction.

That is, a U-shaped holder 1 is horizontally rotatably attached to a first vertical support shaft 5 fixed to the temple cover 3. Further, a grip plate 7 extending in the warp direction is attached to a second horizontal support shaft 9 provided in the holder 1 so as to be vertically rotatable. Therefore, the grip plate 7 is rotatable in the horizontal direction with respect to the first support shaft 5 and in the vertical direction with respect to the second support shaft 9. However, this second support shaft 9
Is not an essential requirement of the present invention, but depending on the fabric structure, the weft may fluctuate up and down with the shedding motion. It is preferable to configure.

An upward protrusion 21 is formed near the front end of the upper edge of the grip plate 7, and a concave portion 23 for releasing the sandwiched weft yarn is formed further rearward of the protrusion 21. Around the lower side of the recess 23, a plurality of mounting holes 13 for the grip wire 11 are formed through the body of the grip plate 7 in the weft direction.

The grip wire 11 has a hairpin curve shape, and one end thereof is fixed to the upper edge of the grip plate 7 in front of the protrusion 21. The grip wire 11 extends inward from the fixing portion and is curved in a U shape, and further extends rearward along one side surface of the grip plate 7 at a position slightly lower than the upper edge of the grip plate 7. After that, it bends slightly upward, straddles the upper edge of the grip plate 7 and then bends slightly downward to reach the other side surface side of the grip plate 7, at a position slightly lower than the upper edge of the grip plate 7. It extends forward along the other side surface and engages with the mounting hole 13 of the grip plate 7 at the other end. Therefore, the weft yarn W is sandwiched between the grip wire 11 and the upper edge of the grip plate 7. The U-shaped curved portion of the grip wire 11 is in contact with the upper surface of the fabric.

The weft holding position is set so as to straddle the weaving line and to be in the same vertical position as the weft. Therefore, at this position, it is possible to hold a plurality of wefts at the same time. Further, since a plurality of mounting holes 13 are formed in the grip plate 7, depending on which mounting hole 13 the other end of the grip wire 11 is engaged with, the grip wire 11 straddles the upper edge of the grip plate 7. It is possible to adjust the state and eventually the clamping force.

A stopper 19 fixed to a loom frame, which is not disclosed, is provided on the outside of the grip plate 7, and when the grip plate 7 is in a state parallel to the warp direction, the tip is provided on the outer side surface of the holder 1. Are set to abut. Since the stopper 19 forms a threaded portion, the regulation position of the grip plate 7 can be adjusted by adjusting the screwing amount with respect to the nut fixed to the loom frame. Further, the grip plate 7 is constantly urged by an attached tension spring 17 so as to rotate outwardly, that is, in a direction away from the fabric end.

Further, at the lower position corresponding to the U-shaped curved portion of the grip wire 11, the inner side surface of the grip plate 7 has a needle ring 1 having a large number of needles on its peripheral surface.
5 is rotatably mounted and engages the lower surface of the fabric. The needle ring 15 is preferably arranged so as to engage with the fabric near the cloth fell as much as possible. Therefore, since the woven fabric is sandwiched between the needle ring 15 of the grip plate 7 and the U-shaped curved portion of the grip wire 11, the engagement between the needle ring 15 and the woven fabric is stable. By arranging a plurality of needle rings 15 side by side in the weft direction, engagement between the holding mechanism and the fabric can be made more reliable.

Next, the operation will be described. Weft insertion nozzle 25
When the weft W is inserted by the weft, the reed 29 moves forward. Since the weft insertion nozzle 25 is provided in the sley (not shown), the weft insertion nozzle 25 also moves forward as the reed 29 moves forward. In addition, among the seven reeds shown in FIG. 1, the outer four reeds are the main reeds and the others are the modified reeds forming the weft guide grooves.

As the reed 29 moves forward, the width of the warp string and the fabric is expanded by the reed 29, so that the warp and the fabric end F
Moves toward the outside. This state is shown in FIG. 1 by a chain line. At the same time, the holding mechanism is operated by the spring force of the tension spring 17, and the needle ring 15 engaging with the fabric moves with the fabric,
Also move to the outside.

As a result of the outward movement of the holding mechanism, the weft yarns connected to the weft inserting nozzle 25 enter the holding member composed of the grip plate 7 and the grip wire 11 and are held. When beating is performed, the weft W is cut by the cutter 27 at a rotation angle of the crankshaft of the loom, that is, at a crank angle of 0 to 25 degrees. Therefore, the weft yarn W on the fabric side is held by the holding mechanism. In addition, the weft yarn W in FIG. 1 shows a state in which the weft yarn is beaten before the weaving.

When the reeds 29 start to retreat, the weave moves inward due to the shrinkage of the weave, and the fabric end F becomes like the one-dot chain line shown in FIG. Then, the holding mechanism causes the weft W to be held.
As a result of the movement of the end of the needle and the movement of the needle ring 15 which engages the fabric, it also moves inward against the spring force of the tension spring 17. Even if the cloth fell moves inward in this way, the nipping mechanism also moves inward following this and the yarn end of the weft does not come off from the nipping mechanism.

When the next weft insertion is performed and the reed 29 moves forward, the holding mechanism returns to the original position shown in FIG. Even if the interwoven cloth changes vertically due to the shedding motion, the grip plate 7 is provided so as to be rotatable in the vertical direction with respect to the second support shaft 9, so that the entire sandwiching mechanism follows the fluctuation and moves up and down. It can be rotated to. Therefore, the yarn end of the weft yarn is even more difficult to come off from the holding mechanism.

In the above construction, in order to minimize the interference between the holding mechanism and the reed 29, the length of the holding mechanism protruding rearward from the reed line, that is, toward the warp sending side, should be as small as possible. desirable.

In the above embodiment, the clamping mechanism is returned to the original position on the outside by the spring force of the tension spring 17 attached to the grip plate 7. However, instead of this, it is also possible to perform this return by the elastic force of the grip plate 7 itself. In this structure, the holder 1 is fixed to the temple cover 3, and a thin plate spring is attached to a horizontal support shaft (corresponding to the second support shaft 9 in the above embodiment) provided on the holder 1. The grip plate 7 is attached so as to be vertically rotatable. Other configurations are the same as those in the above embodiment.

When the reed moves forward and the warp yarns and the fabric end F move outward, the clamping mechanism acts by the spring force of the grip plate 7 and the needle ring 15 that engages with the fabric.
As a result of the movement of (1), it also moves outward and returns to the original position.

In the above embodiment, the grip plate 7 is provided so as to be rotatable in the horizontal direction with respect to the first support shaft 5 in the vertical direction. However, instead of this, the grip plate 7
May be provided so as to be movable parallel to the weft direction. For example, the temple cover 3 may be provided with a guide rail or a guide bar extending in the weft direction, and the grip plate 7 may be slidably engaged with this.

Further, as the holding mechanism, a leaf spring may be used instead of the grip wire, and the weft thread may be held between the lower surface of the leaf spring and the upper edge of the grip plate.

In the above-described embodiments, the pinching mechanism is returned to the original position by the depolarizing drive utilizing the spring force or the like, but it may be positively driven. An example thereof is shown in FIG. In this case, an appropriate return actuator, for example, the solenoid 43, is attached to the holder 1
It is provided so as to be engageable with the engaging piece 33 and drives the holder 1 in synchronization with the movement of the reed. More specifically, the crank angle of the crankshaft 35 of the loom is set by the encoder 37.
And input to the comparator 41. This comparator 41
A crank angle setter 39 is connected to the. When the detected crank angle input from the encoder 37 becomes equal to the set crank angle input from the setter 39, the solenoid 43 is activated and the tip of the plunger presses the engaging piece 33 of the holder 1. By doing so, the clamping mechanism is positively moved to the outer original position, that is, the stopper 1
It is to return to the position corresponding to 9.

Since the nipping mechanism needs to return to the original position following the outward movement of the cloth fell as the reed moves forward, the crank angle set by the setter 39 is a value satisfying this condition (for example, 300 to It is set to a value that excites the solenoid 43 over the crank angle range of 60 degrees. Of course, when the solenoid 43 is not excited, the holding mechanism is set to be movable inward.

Further, the holding mechanism may be moved inward and outward by positive drive. For example, in the configuration of FIG. 4, the solenoid 43 is a phase-direction excitation type solenoid, and the tip of the plunger of the solenoid 43 is connected to the engagement piece 33 of the holder 1 so as to be rotatable relative to each other. In this case, the set crank angle is, for example, in the range of the crank angle of 300 to 60 degrees, the solenoid 43 is excited to return the holding mechanism to the original position, and the crank angle of 60 to 60 degrees is set.
In the range of 120 degrees and 240 to 300 degrees, the solenoid 43 is set in a non-excited state to leave the sandwiching mechanism in a free state, and the solenoid 43 is excited in the inward moving direction in the range of 120 to 240 degrees. At this time, the needle ring 15 may be attached or may be omitted.

In the embodiment described above, the weft thread is clamped by the clamp mechanism by utilizing the elasticity of the clamp member, but FIG. 5 shows an example in which this is performed by positive drive. That is, the temple cover 3 is provided with the lower holder 53, and the upper holder 51 is provided so as to be openable and closable with respect to the lower holder 53. An upper grip plate 55 is fitted to the upper holder 51, and a lower grip plate 57 is fitted to the lower holder 53 at the end portions. Grip plate 55,
57 is rotatably provided on the holders 51 and 53 by a shaft 61 at a concave-convex fitting portion. The grip plate is provided with a stopper 19 in the same arrangement as in the case of the embodiment of FIG. The upper holder 51 is fixed to the drive shaft 59. The drive shaft 59 is driven by an appropriate drive source such as a cam or an actuator.

In the above structure, the upper grip plate 55 is rotated by the rotation of the drive shaft 59, and the upper grip plate 55 is rotated.
At the same time, the grip plate 57 on the lower side is opened and closed. As the timing of opening and closing, for example, the "closed state" is set in the crank angle range of 0 to 250 degrees, and the "open state" is set in the crank angle range of 250 to 0 degrees.
The upper and lower grip plates 55, 57 are moved inward by the pulling force of the weft yarn ends being held. The clamping mechanism is returned to its original position by exciting the electromagnet 63, and the stopper 19 is brought into contact with the grip plate. The excitation of the electromagnet 63 at this time may be set according to the case of the solenoid 43 in the embodiment shown in FIG. As in the present embodiment, the sandwiching mechanism that sandwiches the wefts by positive drive is advantageous when a plurality of repulsed wefts are sequentially taken out as defective wefts by the defective yarn removing device. That is, the defective yarn removing device reverses the weaving machine stopped at the time of occurrence of the weft insertion defect to eject the defective yarn, captures the end of the defective yarn between the holding mechanism and the fabric end, and releases the defective yarn during warp opening. When pulling out not only defective yarns but also weft yarns up to multiple cycles in advance, it is possible to catch the yarn end by positively opening the pinching mechanism every time the yarn end is caught. You can

[0032]

EFFECTS OF THE INVENTION Even when the width of the fabric is reduced due to the shrinkage of the weave when the reed is retracted, the weft holding member also moves inward following the shrinkage of the reed, so that the weft does not come off from the holding member.
Therefore, the problem of fabric quality such as the loss of tightness of the ear tissue is eliminated. Further, in the past, the distance from the gripping mechanism to the weft cutter had to be increased so that the end of the weft thread would not come out of the gripping mechanism even if weaving shrinkage occurred, but according to the present invention, the weft cutter Can be brought closer to the gripping mechanism, so that the length of the atrial ear can be shortened accordingly.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of the device of the present invention.

FIG. 2 is a perspective view of the same.

FIG. 3 is a plan view showing the operating state of the same.

FIG. 4 is a plan view showing another embodiment of the device of the present invention.

FIG. 5 is a perspective view showing still another embodiment of the device of the present invention.

[Explanation of symbols]

 1 Holder 3 Temple Cover 5 1st Spindle 7 Grip Plate 9 2nd Spindle 11 Grip Wire 15 Needle Ring 19 Stopper 25 Weft Insertion Nozzle 27 Cutter 29 Reed 35 Crankshaft 39 Crank Angle Setting Device 41 Comparator 43 Solenoid 51 , 53 Holder 55, 57 Grip plate 59 Drive shaft 63 Electromagnet F Woven edge W Weft

Claims (1)

[Claims] 1. A type having a holding mechanism which is provided between a weft cutter and a fabric end and which holds an end portion of a repulsed weft, wherein at least the weft holding member of the holding mechanism retreats the reed. A weft yarn end holding device, which is provided so as to be able to move inward following the weaving shrinkage associated therewith and to move outward when the reed moves forward to return to its original position.