JP2935671B2 - Weft end catching device of jet loom - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a weft leading end catching device for a jet loom.

[0002]

2. Description of the Related Art In a jet loom, a fluid composed of water or air is jetted from a nozzle along a warp row opened by an opening motion, and a weft yarn measured in a required amount each time is placed on this jet stream, and a jet loom is mounted on the jet loom. The woven fabric is manufactured by repeating the operation of inserting from the side and driving the weft before weaving by a beating motion.

[0003]

The measured length of the weft tends to return to the nozzle side from the tip at the same time as the end of insertion. Since it is hit in such a state,
Inevitably, the weft tension of the woven fabric is weak on the non-nozzle side, and the woven fabric has a weft structure. On the nozzle side, the woven fabric has a warp structure, and the woven fabric has a difference between left and right. This becomes a problem after fabric processing, particularly in the case of grain fabric, and is troublesome.

[0004] As another problem, there is a demand for measures to improve the tension when pushing the weft end into the detecting device.

The present invention has been proposed in view of the above-mentioned problems of the prior art. It is an object of the present invention to prevent the leading end of the weft from being returned by catching the leading end of the weft immediately after insertion. To provide a weft leading end catching device for a jet loom that secures a stable tension from the original to the leading end with a force to make it possible to manufacture a woven fabric with no difference between left and right, and also enables a tension up when pushing into a weft detecting device. It is in.

[0006]

According to the present invention, in order to achieve the above object, a fluid consisting of water or air is ejected from a nozzle along a warp row opened by an opening motion, and a required length is measured each time. The weft is put on this jet, inserted from one side of the loom, and the operation of driving the weft before weaving in a beating motion is repeated to produce a woven fabric. is suspended support or raising the support to be pivotable in the same direction, it is retracted biased reed side from the insertion path of the weft during insertion of weft thread by the spring, Clan
It is generated in the first half the course of the forward movement of the beating movement by the click mechanism
A first arm that pushes the weft immediately after insertion toward the front side of the weaving by oscillating forward to the front side of the weaving faster than the reed in the latter half of the forward movement by the inertia against the spring and intersecting with the first arm. In response to the above, the support is suspended or raised so as to be swingable in the same direction as the beating direction on the weave front side of the reed, and is moved forward by the counterweight from the weft insertion path to the weave front side at the time of inserting the weft and held. A second arm that moves in the retreating direction in the second half of the forward movement by the inertia of the counterweight generated in the first half of the forward movement of the beating motion by the crank mechanism and intersects with the first arm to capture a weft; When the weft is inserted, the second arm is positioned on the weave front side with respect to the weft insertion path, and the first arm is positioned on the reed side with respect to the weft insertion path.
Accordingly, the second arm is caused to retreat, the first arm is moved forward, and the inserted end of the weft immediately after insertion is captured by the first arm and the second arm.

According to the present invention, the first arm and the second arm can be retracted before and after the weft insertion path at the time of inserting the weft, and the insertion of the weft is not hindered. At the time of beating, the weft immediately after insertion
It is possible to produce a woven fabric having no warp or warp by capturing and tensioning by the arm and the second arm, and also to increase the tension up when pushing into the weft detecting device. That is, in the present invention, since the beating movement is performed by the crank mechanism, the moving speed of the reed is zero at one end of the reciprocating stroke, but gradually increases to the center of the stroke when moving toward the other end. Paying attention to the point that the speed gradually decreases from the center to the other end and becomes zero, and when the reed moves toward the weaving front side, the speed is gradually increased up to the center of the movement stroke and gradually toward the end of the beating. The first arm is moved forward earlier than the reed by the moving inertia generated in the first half of the movement of the reed to the weaving front side, and the second arm is moved rearward so that both the weft insertion ends are moved. Can be captured at twice the speed due to the mutual approach of the arms.
Further, the same effect can be obtained even if the present invention is implemented by using only one second arm so that the weft end is captured by the reed and the second arm.

[0008]

1A is a schematic side view of a main part of a jet loom according to a first embodiment of the present invention when a weft is inserted, FIG.
(B) is a schematic side view at the time of beating, FIG. 2 (A) is a schematic plan view of the loom on the installation side of the weft detecting device, (B)
1 is a schematic front view showing the relationship between a weft detecting device and an arm. In FIG. 1, 1 is a warp, 2 is a weft, 3 is a reed,
Denotes a first arm, 5 denotes a second arm, and 6 denotes a weft detecting device.

The warp yarn 1 is drawn out from the warp beam 8, and is wound on a cross beam 16 via a backrest 9, ayatake 10, healds 11 and 12, a breast beam 13, a winding roller 14 and a guide roller 15. Held 1
The opening motion mechanism (not shown) 1 and 12 is formed by a tappet cam or the like. Each time the weft 2 is inserted, the warp 1 is alternately moved up and down to form an opening for inserting the weft 2.

Although the mechanism for inserting the weft 2 is omitted in the drawing, a nozzle (not shown) is provided on one side of the insertion path for the weft 2, and the nozzle is preliminarily measured every time on the fluid ejected from the nozzle. The lengthened weft 2 is skipped and inserted toward the other side. On the side opposite to the nozzle, a weft detecting device 6 and, correspondingly, a first arm 4 and a second arm 5 are installed, and a scissors 17 for cutting the weft that has protruded laterally and the weft waste after cutting are provided. Is provided. The weft detecting device 6 has a bifurcated shape as shown in FIG. 1, has an opening toward the reed 3, and is provided with a light emitter and a light receiver for confirming the presence of the weft 2 above and below the opening. When the weft 2 is not confirmed, the loom is stopped. In the case of a water jet loom, the light projector and the light receiver are installed at different positions that do not come into contact with water, and from this position are guided to the bifurcated portion by an optical fiber cable, and are connected to a terminal of the optical fiber cable. Are installed facing each other.

[0011] The reed 3 is driven by a crank (not shown) of the beating motion mechanism interlocked with the opening motion mechanism, with a sine curve-like moving speed change in the front-rear direction to perform a beating motion. A first arm 4 and a second arm 5 are provided on the front upper portion of the reed 3, that is, on the upper portion on the weave front 19 side.
Are swingably supported via pivots 4a and 5a in the same direction as the beating direction. A return spring 4b for urging the first arm 4 in the backward direction is provided on the pivot 4a. The strength of the return spring 4b is adjustable, and its urging force is set to be smaller than the inertial force of the first arm 4 during the beating movement. The first arm 4
A plurality of thin metal wires are suspended in parallel in the width direction of the fabric 20 at appropriate intervals so that they can pass through both sides of the weft detecting device 6 as shown in FIG. 2B.

The second arm 5 is also made of a similar metal wire, passes between the first arms 4 and intersects with the first arm 4 so that the insertion end of the weft 2 can be captured, and is located above the pivot 5a. The counterweight 5b is provided at the extension end. This counterweight 5b is used for beating
The forward moving speed of the reed 3 is gradually increased at the beginning, gradually reduced in the middle, and the moment of inertia forward of the counterweight 5b around the pivot 5a is higher than that of the second arm 5 forward. Is set to be large. In addition, a stopper (not shown) that regulates the swing range of the first arm 4 and the second arm 5 is provided.

The first embodiment of the present invention has the above configuration, and the operation will be briefly described below. First, a fluid consisting of water or air is ejected from a nozzle along one row of the warp yarn opened by the opening motion, and the weft 2 measured for the required amount each time is placed on this jet, and inserted from one side of the loom, The operation of driving the weft 2 into the weave 19 with the reed 3 by the beating motion is repeated to produce the woven fabric 20, which is wound around the cross beam 16.

When the weft 2 is inserted, the first arm 4 may be retracted from the insertion path of the weft 2 to the reed 3 side, and the second arm 5 may be advanced to the weave front 19 side from the insertion path of the weft 2. Thus, the insertion of the weft 2 is not hindered, and at the time of beating, the inserted end of the weft 2 immediately after the insertion can be captured and tensioned by the first arm 4 and the second arm 5. And
It can be reliably pushed into the weft detecting device 6. That is, in the present invention, since the beating motion is performed by the crank mechanism, the moving speed of the reed 3 is zero at one end of the reciprocating stroke, but gradually increases to the center of the stroke when moving toward the other end, Paying attention to the point that the speed is gradually reduced from the center toward the other end to become zero, and when the reed 3 moves toward the weave 19 side, the speed is gradually increased up to the center of the moving stroke, and the beating end The first arm 4 is moved forward earlier than the reed 3 by the moving inertia generated in the first half of the movement of the reed 3 toward the weave front 19, and the second arm 5 The insertion end of the weft 2 can be quickly caught by the weight 5b being moved backward by the mutual approach of both arms. Then, the weft immediately after insertion can be pushed toward the weft detecting device 6 in a tensioned state.

FIG. 4A is a schematic side view of a main part of a jet loom according to a second embodiment of the present invention when a weft is inserted, and FIG.
FIG. 3 is a schematic side view of the beating, in which the first arm 4 in the first embodiment is omitted, only one second arm 5 is installed, and the second arm 5 and the reed 3 are used immediately after insertion. The weft yarn end is captured, and the same operation and effect as in the first embodiment can be obtained by this configuration. In each of the above embodiments, the case where the arm is suspended and supported on the upper part of the reed is illustrated, but the lower part of the arm is pivotally mounted on the front surface of the support leg of the reed, and the upper end captures the leading end of the weft. It can also be carried out in a supporting manner.

[0016]

According to the present invention, the leading end of the weft is prevented from returning by catching the leading end of the weft immediately after insertion, and a stable tension from the original to the leading end is secured by the returning force.
It is possible to provide a weft leading end catching device of a jet loom, which enables the manufacture of a woven fabric having no difference between left and right, and also enables a tension up when the fabric is pushed into a weft detecting device.

[Brief description of the drawings]

1A is a schematic side view of a main part of a jet loom according to a first embodiment of the present invention when a weft is inserted, and FIG.

FIG. 2 (A) is a schematic plan view of a loom on the installation side of a weft detecting device, and FIG. 2 (B) is a schematic front view showing a relationship between the weft detecting device and an arm.

FIG. 3 is a time chart showing an operation related to a crank, a reed, and an arm.

FIG. 4A is a schematic side view of a main part of a jet loom according to a second embodiment of the present invention when a weft is inserted, and FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Warp 2 Weft 3 Reed 4 First arm 5 Second arm 6 Weft detector

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) D03D 47/28 D03D 49/60-49/62

Claims (2)

(57) [Claims] 1. Along a warp row opened by an opening motion,
A fluid consisting of water or air is ejected from the nozzle, and the weft yarn measured for the required amount is placed on this jet each time, inserted from one side of the loom, and the wefting operation is repeated by a beating motion to repeat the operation of weaving the fabric. In the jet loom that is manufactured, the reed is hanged or supported on the front side of the reed so that it can swing in the same direction as the beating direction, and the reed is closer to the reed than the weft insertion path when the weft is inserted by the spring. Was retracted to the crank machine
Due to the inertia generated in the first half of the forward movement of the beating motion by the frame, in the second half of the forward movement, the weft immediately after the insertion is swung forward to the weave front side faster than the reed, against the spring. A first arm for pushing toward the weaving front side, and a hanging support or a rising support for swinging in the same direction as the beating direction on the weaving front side of the reed corresponding to the first arm so as to be able to cross the first arm; to advance to the front weave from weft insertion path of upon insertion of the weft held by, Clan
It is generated in the first half the course of the forward movement of the beating movement by the click mechanism
The second half of the forward movement by the inertia of the counterweight that
A second arm that moves in a retreating direction and intersects with the first arm to capture the weft; and, when the weft is inserted, positions the second arm on the weave front side from the weft insertion path. One arm is positioned on the reed side with respect to the weft insertion path, and at the time of beating , the second arm is moved backward by the inertia , the first arm is moved forward, and the weft insertion end immediately after insertion is moved to the first position. A weft leading end catching device for a jet loom, wherein the weft leading end catching device is adapted to catch by a arm and a second arm. 2. Along the warp row opened by the opening movement,
A fluid consisting of water or air is ejected from the nozzle, and the weft yarn measured for the required amount is placed on this jet each time, inserted from one side of the loom, and the wefting operation is repeated by a beating motion to repeat the operation of weaving the fabric. In a jet loom designed to manufacture a reed, the reed is suspended and supported on the front side of the reed so as to be swingable in the same direction as the beating direction, and the weft is inserted from the weft insertion path when the weft is inserted by the counterweight. Before the forward movement of the beating movement by the crank mechanism.
Due to the inertia of the counterweight generated in the half process
A second arm that moves in the retreating direction in the latter half of the forward movement and captures the leading end of the weft between the front side of the reed and the weft; The second arm is retracted by the inertia during the beating, and the leading end of the weft immediately after the insertion is captured by the reed and the second arm. apparatus.