JPS63275747A - Weft yarn end part holding apparatus in air jet 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 Industrial Application] The present invention relates to a weft end holding device in an air jet loom that uses an air jet to insert the weft, that is, to pass the weft through a shed.

[Prior art and its problem] In air jet looms, weft threads are made to fly through the shed by an air jet ejected from a nozzle provided on one side of the shed, and most of them are as described above. In order to prevent the dispersion and deceleration of the jet stream ejected from the nozzle and ensure weft insertion, there is an air guide method that covers the weft flying part in front of the reed in a tunnel shape, a modified reed method with an auxiliary nozzle, or the above-mentioned method. It is equipped with means such as an air guide system with an auxiliary nozzle that combines both.

Furthermore, if the weft yarns that are flown by the jet stream and are inserted are beaten in a relaxed state, the warp density becomes uneven and the quality of the fabric surface deteriorates. In order to apply appropriate tension to the weft yarn, the yarn end is held by suction on the side opposite to the yarn feeding side by the nozzle, that is, on the side of the selvedge on the opposite yarn feeding side.

As for the yarn end suction means, in addition to the conventional yarn end suction port, for example, as seen in Japanese Patent Publication No. 51-42672, weft yarn flying part on the opposite yarn feeding side and a weft yarn flying part in the vertical direction are used. There is one in which intersecting jet channels are provided, and the ends of the flying wefts are brought into contact with the jet channels and held under suction.

However, in the case of the conventional yarn end suction method, the weft is held at an appropriate tension, and is not intended to prevent untwisting from the suctioned weft end. Although the yarn is bent and suctioned against the yarn, its ends may be floating in the suction air, and if the yarn has a large number of twists, there is a risk of untwisting. This will cause unevenness on the surface of the woven fabric, resulting in a decrease in quality. Therefore, it is extremely difficult to use an air jet loom to weave a fabric using a highly twisted yarn having a twist count of 800 times or more per 17 FL as the weft, which is likely to untwist from the loop.

Furthermore, in the case of the yarn end suction method disclosed in the above-mentioned publication, the structure of the jet flow path is quite complicated.

Therefore, the present invention makes it possible to maintain the inserted weft yarn at an appropriate tension without creating a complicated structure in an air jet loom, and at the same time, it is possible to reliably prevent untwisting from the weft end, and to convert the highly twisted yarn into the weft yarn. It is an object of the present invention to provide a weft end holding device which enables weaving even when used for weaving.

[Means for Solving the Problems] In other words, the present invention is directed to an air jet loom in which the weft is caused to fly by a jet stream and pass through a shed, and in particular, in order to solve the above-mentioned problems, A stretch nozzle that can inject air toward the reed across the weft flying part is provided on the liquid side position on the side of the selvedge part on the yarn side, and the air is jetted from the stretch nozzle every time the weft is inserted to prevent the weft from flying. It is characterized by being provided so that the ends of the weft threads are blown onto the reed side and penetrated into the liquid state.

[Function] According to the above-mentioned apparatus of the present invention, the weft yarn is inserted by the air jet from one side of the shed to the other side by the main nozzle, etc., and in response to this weft insertion action, the counter-feeding yarn is On the side, a stretch nozzle injects air across the weft flying portion toward the reed. Therefore, when the end of the flying weft reaches the air injection part of the stretch nozzle, the weft end is pressed into the liquid state by the air jet flow, and as the injection air flows backward between the reed blades, , the weft ends also enter between the reed feathers and become locked in the liquid state. In particular, the gap between the reed feathers is quite narrow, but since it is in the form of a vertically elongated slit, the weft end can easily enter and be locked in the liquid gap. Therefore, the inserted weft is not only held at a predetermined tension, but also the locking action and pressing force of the weft end against the reed combine to prevent untwisting from the weft end. .

[Example] Next, embodiments of the present invention will be described based on the drawings.

FIGS. 1 to 3 show an air jet IIIf& according to the present invention.
It shows the main parts of. In the figure, (1) is the warp, (
2) is a woven fabric, (3) is a reed, and (4) is a liquid plug, and the reed (3) has a guide for weft thread flying at the front edge of each liquid (3a) *
(5) Consists of a modified reed having a protrusion. (6
) is a main nozzle, and this main nozzle (6) flies the weft yarn (8) fed through a drum-type or other weft storage device (7) as shown in the figure to the shed (A ) is set up so that people can pass through it.

Reference numerals (9) denote auxiliary nozzles arranged at required intervals along the shed (A), and are provided to assist the flight of the weft by the main nozzle (6). In addition to the above, an air guide may be provided in front of the reed without using the modified reed and the auxiliary nozzle (9), or the air guide and the auxiliary nozzle may be used together.

(10) is fi! on the side of the selvedge portion on the side opposite to the yarn feeding side by the main nozzle (6), that is, on the anti-yarn feeding side. (3
) is a stretch nozzle located slightly in front of the
It is provided so that air can be injected toward the reed (3) across the weft flying portion formed by the guide groove (5) and the like of the modified reed. Although not shown, this stretch nozzle (10) is supported so as to swing back and forth in synchronization with the movement of the reed (3), and the interval between the stretch nozzle (10) and the reed (3) is always constant. It is provided so that it is held in place. Further, the air injection by the stretch nozzle (10) is set to correspond to the air injection from the main nozzle (6), that is, the weft insertion effect thereof.

For example, the operation timing of the above device is set as follows depending on the rotation angle of the crank Rm.

If the point where the crankbin is at the frontmost position is Oo, the main nozzle (6) usually starts air injection from around 60", and
Start weft insertion from 0', the weft end reaches the opposite yarn feeding side at 200-24o, and at about 270o the main nozzle (6
), the air injection is stopped, and then the beating motion is performed. Therefore, the above-mentioned stretch nozzle (1o)
In this case, in consideration of the case where the weft yarn reaches the anti-yarn feeding side faster than usual, the two
Set the air injection to be performed at around 7o° or until just before the beating. The injection pressure from this stretch nozzle (10) is preferably about 5 K9/ci.

In addition, the stretch nozzle (1o) can use the same pressure source such as a compressor as the main nozzle (6) and the auxiliary nozzle (9), and a solenoid valve or pressure adjustment device in the supply path from the pressure source. The above-mentioned injection action is controlled by electrical means via the above.

(11) in the figure shows a weft filler that detects the arrival of the weft (8).

The above air jet tIav! The action during weaving in A will be explained.

The weft (8) is passed through the main nozzle (6) and the auxiliary nozzle (
9) etc., the vehicle is flown by an air jet from one side of the shed (A) to the other side, and is passed through the shed (A). Corresponding to this weft insertion action, the weft end (8
The stretch nozzle (10
) is injecting air toward the reed (3) across the weft flying part, so that the end (8°) of the flying weft (8) crosses the weft flying part and blows the air toward the reed (3). Stretch nozzle (10)
When reaching the air injection part, the air injection flow presses the weft (8) strongly against the plurality of liquid sheets (3a) as shown in Fig. 4, and the air injection flow! (3)
As the liquid flows backward between the liquid states (3a) and (3a), the weft end (8°) also enters between the liquid states (3a) and (3a), and as a result, the weft ends are locked in the liquid state (3a). become.

In particular, the gap between the reed feathers (3a) (3a) varies depending on the thickness of the warp, but even if the gap is as narrow as 1.5 og+, for example, it forms an elongated slit in the vertical direction. ) can easily enter and lock between the reed wings (3a) (3a). As a result, the inserted weft (
8) is not only maintained at a predetermined tension, but in particular, the locking action of the weft end (8゛) to the reed feathers (3a) and the pressing action against the plurality of reed feathers (3a) are combined. Therefore, even if the yarn is highly twisted, untwisting from the weft end is prevented.

Therefore, if the reed (3) held in the above state moves to the weaving area and performs reed beating, even if the weft is a strongly twisted yarn, untwisting will not occur and the original number of twists will be maintained over the entire length. Since the weft is beaten while the cloth is held, a high-quality fabric with a good finish is woven.

[Effects of the Invention] As described above, according to the present invention, even when a highly twisted yarn with a large number of twists is inserted as a weft, the tip of the weft can be reliably held in a state where it is latched to the reed feathers. In addition to being able to maintain an appropriate tension, untwisting of the weft ends can be reliably prevented, and weaving using an air jet loom using highly twisted yarn as the weft becomes possible without any problems. Further, the fabric woven by this method is free from problems such as uneven weaving due to untwisting of the weft yarns before beating the reed, and a fabric of good quality can be obtained.

Moreover, in the case of the present invention, since the reed is used to lock the weft ends by air injection from the stretch nozzle, the structure is simpler than that of the conventional yarn end suction method.
This makes it easier to implement.

[Brief explanation of drawings]

Fig. 1 is a perspective view of the main parts of an air jet n machine showing an embodiment of the present invention, Fig. 2 is an enlarged perspective sectional view of the same part, Fig. 3 is a longitudinal sectional side view of the same, and Figs. 4 and 5 are weft threads. FIG. 4 is a cross-sectional view and a vertical cross-sectional view of the end portion inserted between the reed blades. (3)... Reed, (3a)... Stratification, (6)... Main nozzle, (8)... Weft, (8°)... Weft end, (10)... stretch nozzle. Figure 2

Claims (1)

[Claims] 1. In an air jet loom in which the weft is caused to fly by a jet stream and pass through the shed, a weft is placed in front of the reed on the side of the selvedge on the opposite yarn feeding side, across the weft flying part and into the reed. The weft is equipped with a stretch nozzle capable of injecting air toward the reed, and is provided in such a way that the end of the flying weft is blown toward the reed by air jet from the stretch nozzle each time the weft is inserted so that it enters between the reed blades. Features: A weft end holding device in an air jet loom.