JPS63126944A - Weft yarn insert method in newmatic loom - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to weaving looms, and more particularly to a method for inserting coco yarn in an I/via or air needle type loom. The invention can be used on pneumatic looms with both horizontal and inclined edge lines.

PRIOR ART Methods of inserting the weft in pneumatic looms, which involve feeding the weft with an air stream into a tubular rapier and advancing the weft through a shed, are widely known (e.g. 161669 International Classification” DO3D 4
7/30.1965).

In this way, the weft is conveyed to the center of the shed, and in the center of the shed another rapier, or receiver carrying the weft through the other half of the shed, is transferred to the rapier by means of an air stream.

However, when the weft yarn is transferred from one rapier to the other and the rapiers begin to move apart, the weft yarn moves in a free jet of air that is not confined to a continuous flow path. In this method, the weft threads tend to become entangled with the warp threads, resulting in misbeats, loops, or flaws in the fabric to be woven, without affecting the productivity of the loom.

When inserting the weft thread over the entire weave with a single tubular rapier (for example, USSR Inventor's Certificate No. 1.61669)
(see International Classification Z 003047/30.1965) The end of the inserted weft thread is held when the rapier reaches its most advanced position in the direction of the pre-insertion stroke.

Feeding of the weft into the rapier begins when the rapier moves forward in its insertion process, and the full length of the weft for beating is fed out when the end of the rapier is approximately 0.7 rn from the ear. It will be done. This means that the weft yarn moves part of the path by moving with the unconfined ejected airflow, making the weft yarn again prone to entanglement with the warp yarns and causing accidental hits. will happen. The ends of the weft threads are caught in the suction tube, and when the ends of the weft threads are pulled out from the suction pipes at high speed, the ends of the weft threads will occupy different positions with respect to the selvage of the fabric.

This results in uneven selvage, increased yarn input, and compromised fabric quality.

Furthermore, when relatively long lengths of weft have to be fed in a short time, which can only occur at high weft feed speeds, additional loads are placed on the weft, resulting in It may also increase the cutting rate.

All these negative factors have a negative impact on the productivity of the loom.

Problems to be Solved It is an object of the present invention to prevent erroneous beating of weft threads inserted over the entire weaving width and to feed the weft threads into the rapier in such a way that the rate of thread breakage is significantly reduced. An object of the present invention is to provide a method for inserting a weft thread in a pneumatic loom, which can improve the quality of cloth woven by the pneumatic loom and the productivity of the loom.

Means for Solving the Problem The purpose is to feed the weft yarn into the tubular I/via by means of an air stream, carry the weft yarn to the shed throughout the weaving by a rapier advancing through the shed, and carry the weft yarn to the shed during the forward stroke of the rapier. direction(,
In a method of inserting a weft thread in a nib-matic loom, which comprises retaining the length of the inserted weft thread when reaching its most advanced position, according to the invention, the feeding of the weft thread into a tubular rapier comprises: This is achieved in a method for inserting a weft thread in a pneumatic loom, which is carried out during the return stroke of a rapier.

To insert the weft thread, wind it into a flat spiral during the return stroke (
Preferably, a flexible tubular rapier capable of
This allows the overall size of the loom to be significantly reduced.

Retention of the ends of the weft on the side opposite the feed side can be achieved in the insertion techniques disclosed herein either by using mechanical grippers or by weaving the weft into the warp of the selvedge. .

The method disclosed herein makes it possible to avoid unrestricted running of the weft yarn relative to the warp yarn when the weft yarn is being conveyed through the shed.

Since the weft thread is not fed when the rapier moves forward, the weft thread does not move relative to the rapier. This makes it possible to insert the weft yarn over the entire weaving width, i.e. free fly of the weft yarn with unconfined air jets.
is prevented, thus eliminating the occurrence of erroneous hits. Reliable insertion of the weft thread is ensured by reliable feeding of the weft thread into the rapier, which allows the weft thread to work (
Controlled by the dual action of compressed air and gripping action.

The ends of the weft threads are gripped and rest against the warp threads, ensuring reliable retention and uniform length at the selvage, reducing weft input and minimizing weft waste. .

EXAMPLES The invention will be explained in more detail with reference to examples of methods according to the invention.

The weft insertion method in a pneumatic loom is performed as follows.

The weft yarn 1 is fed from a supply pobbin 2 by a metering mechanism 3 through a compensating device 4 and a compressed air device (not shown).
Tubular rapier 5 (Fig. 1)
send to. Here, a stream of compressed air holds the weft yarn under tension. Either a mechanical gripping device 6 or a special group of warp threads 7 adjacent to the ears are placed on the opposite side of the shed. When guiding the weft thread 1 to the rapier 5, the end 8 of the weft thread
(Fig. 1) protrudes from the end of the rapier. For conveying the weft thread 1 through the shed, either a rigid tubular rapier (not shown in FIGS. 1 and 2) or a flexible tubular rapier, as known in the art, is used. The flexible tubular rapier, on the return stroke or retraction stroke from the shed, e.g.
(Fig. 1) to form a flat spiral.

Designing such a rapier can be easily accomplished by those skilled in the art. During the return stroke of the tubular rapier 5, the weft thread 1 is fed into the tubular rapier 5.

When the disc 9 is rotated clockwise, the rapier 5 advances into the shed and the weft thread 1 also advances together with the rapier 5. At this time, the weft thread 1 does not move relative to the rapier 5, but is held under tension by the compressed air flow flowing through the rapier 5. Such advancement of the weft thread 1 is achieved by the rapier 5 unwinding the weft thread 1 from the disk 9 together with the weft thread 1 passed through it, while the compensator 4 controls the weft thread 1 fed out from the metering mechanism 3. Store thread 1 and do not send it to rapier 5. When the leading edge of the rapier 5 reaches the area of the ears of the warp threads, the protruding weft threads are removed either by a mechanical gripping device 6 (FIG. 1) or by a special group of warp threads 7 (FIG. 2). Edge 8 is retained. In either case,
The end 8 of the weft thread is gripped and the length of the weft thread 1 fed out by the compensator M4 (Fig. 1) is equal to the length of the return stroke from the frontmost position of the rapier 5, so that it remains stationary with respect to the warp thread. Since it is held in this position, the end 8 of the coco thread is precisely fixed.

Thus, during the return stroke of the rapier 5, the insertion end 8 of the weft thread 1 is held, for example by the gripping device 6, while the compensating device 4 feeds the weft thread 1 into the rapier 5. (Thus, the weft thread 1 is exposed to both a stream of compressed air and gripping means, either in the form of a mechanical gripping device 6 (FIG. 1) or in the form of a group of warp threads specifically provided for this purpose. Controlled by the action of gravity.

The feeding of the weft thread 1 to the rapier 5 during the return stroke of the rapier 5 is achieved mainly by the insertion end 8 of the weft thread being held by the mechanical gripping device 6 or by the ears 7 of the warp threads and by the rapier 5
This can be done without using compressed air due to the return stroke. However, when operating with relatively weak weft threads 1, it is expedient to preferably supply compressed air to the rapier 5 to avoid thread breaks. The joint action of the grip and the compressed air prevents the weft from twisting and sticking to the inside of the rapier 5 or to other elements, ie aids reliable weft insertion.

When the rapier 5 completes its return stroke, the weft thread 1 to the rapier 5 is
feeding will stop. The part of the weft thread inserted into the shed is
The rapier 5 is cut on the side into the shed by a suitable shear and driven into the fabric in any known manner. Having received a full supply of weft threads for the next hit, the rapier 5 is ready for the next insertion cycle and the compensator 4 begins to store the next supply of weft threads 1.

Effects of the Invention According to the present invention, since the weft yarn is inserted throughout the weft without physical contact with the warp yarn, erroneous beating can be avoided and the production of the loom can be improved by reducing the rate of yarn breakage. You can increase your sexuality. Moreover, the present invention can improve the quality of the fabric by obtaining a more uniform and uniform selvage, and can reduce wastage of weft threads.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing a process of mechanically grasping the end of the weft thread and inserting the weft thread. FIG. 2 is a diagram showing the grasping of the weft threads by a group of warp threads adjacent to the ears.

Claims (4)

[Claims] (1) The weft yarn 1 is sent into the tubular rapier 5 by an air flow, and the rapier 5 moving forward through the shed carries the weft yarn 1 to the shed over the entire weaving width until it reaches the position where the rapier has advanced furthest in the direction of its forward movement. In the method of inserting the weft thread in a pneumatic loom, which includes holding the end of the inserted weft thread 1 when reaching the end, the feeding of the weft thread 1 into the tubular rapier 5 is carried out during the return stroke of the rapier 5. A method for inserting a weft thread in a pneumatic loom, which is characterized by: (2) A flexible tubular rapier 5 is used for inserting the weft thread 1, and the flexible tubular rapier 5 can be wound into a flat spiral during the return stroke. 1) A method for inserting a weft thread in a pneumatic loom as described in item 1). (3) A method for inserting a weft thread in a pneumatic loom according to claim (1), which comprises holding the end 8 of the weft thread 1 by a mechanical gripping device 6. (4) The method for inserting a weft thread in a pneumatic loom according to claim (1), which comprises holding the end 8 of the weft thread 1 by the warp thread 7 of the selvedge.