JPH0770879A - Weft inserting device in weaving machine of air jetting type - Google Patents

Abstract

PURPOSE:To provide a weft inserting device in a weaving machine of air jetting type, applicable to weft liable to fluff, capable of rapidly returning the tip part of weft coming out from the tip of a main nozzle in a non-contact state with wept in preparation for the next weft inserting. CONSTITUTION:In a weft inserting device in a weaving machine of air jetting type, an air blowing hole 2a and a weft returning hol-e 2b opposing the air blowing hole are made in the placed on the upstream direction approximately rectangular to a weft passageway side of a main nozzle 8 or a weft passageway 3 of a accelerating tube 2 of a tandem nozzle 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weft insertion device for an air jet loom.

[0002]

2. Description of the Related Art Conventionally, in weft insertion of strongly twisted yarn and the like, weft insertion mistakes frequently occur due to the bad attitude of the tip portion of the inserted weft thread that emerges from the tip of the main nozzle. In addition, in the case of mixing or multicolor weft insertion, there is a problem that the leading end portions of the weft yarns coming out from the adjacent main nozzles are entangled with each other.

[0003]

Therefore, in order to eliminate the drawbacks of the weft insertion device of the air jet loom, a weft pullback lever having a yarn guide is arranged in the weft passage upstream of the main nozzle. After the weft insertion of the weft is finished, the weft is cut at the end of the woven fabric, and then the weft retract lever is raised to bend the weft and pull back the tip of the weft that comes out from the tip of the main nozzle. A weft insertion device for an air jet loom has been proposed (see Japanese Patent Laid-Open No. 60-17150). However, promptly guiding the weft yarn by such a yarn guide that is in contact with the weft yarn is not suitable for weaving the weft yarn, which causes friction between the weft yarn and the weft yarn.

The present invention has been made in order to eliminate the drawbacks of such a weft insertion device in a conventional air jet loom, and the tip of the weft that comes out of the tip of the main nozzle quickly without contacting the weft. It is an object of the present invention to provide a weft insertion device of an air jet loom that can be pulled back in preparation for the next weft insertion and can be applied to a weft that easily fluffs.

[0005]

In order to achieve the above object, the present invention is directed to a weft insertion device in an air jet loom, and a tandem nozzle provided upstream of the main nozzle or in the weft passage upstream of the main nozzle. With respect to the weft passage of the accelerating tube, an air blowout hole and a weft pullback hole facing the air blowout hole are provided substantially at right angles. It is advantageous to provide a support for the weft to be pulled back outside the weft pulling hole.

[0006]

Operation: An air outlet hole and a weft yarn return hole that opposes the air outlet hole in a direction substantially perpendicular to the weft passage upstream of the main nozzle or the weft passage of the acceleration tube of the tandem nozzle provided upstream of the main nozzle. Since the weft yarn is cut between the woven fabric and the main nozzle, and a predetermined amount of air is blown from the air blowing hole at an appropriate timing until it is jetted by the main nozzle for the next weft insertion. By jetting, the weft is blown out from the weft pull-back hole and bent, and the tip of the weft is pulled back from the tip of the main nozzle. When the weft support is provided outside the weft pull-back hole, the length of the weft blown into the weft pull-back hole is easily determined, and the pull-in length of the tip of the weft that comes out from the tip of the main nozzle can be adjusted. It can be easily fixed.

[0007]

Embodiments of the present invention will be described below with reference to a weft insertion device in an air jet loom shown in the drawings. In addition, in the drawings, the same or corresponding parts are denoted by the same reference numerals.

In FIGS. 1 and 2, 1 is a supply drum, and 10 is a tandem nozzle provided upstream of the main nozzle 8 for inserting the weft in cooperation with the main nozzle 8. At the tip of the accelerating tube 2 of the tandem nozzle 10, an air blowout hole 2a capable of blowing air at a substantially right angle to the weft passage 3 and the air blowout hole 2 are provided.
A weft pull-back hole 2b is formed so as to face a. Then, the air blowing block 4 having the air blowing nozzle portion 4a connected to the air blowing hole 2a is attached thereto.

As shown in FIG. 1, a pipe 5 connected to a compressed air source (not shown) is connected to an air blowing nozzle portion 4a of an air blowing block 4 via an air pressure adjusting valve 7 and an electromagnetic valve 6. Wefts from a weft supply source (not shown) are stored in the supply drum 1 for each one pick, and are inserted into the warp shed by jetting air from the main nozzle 8 and the tandem nozzle 10 cooperating therewith.

Finishing the wefting of the weft inserted,
At the timing (about 30 to 90 °) between the time when the weft yarn is cut at the end of the woven fabric and the time when the main nozzle 8 is jetted next time, the electromagnetic valve 6 is opened, and the pipe 5 and the air blowing block 4 are opened from the compressed air source. Air is blown from the air blowing hole 2a through the air blowing nozzle portion 4a, the weft Y is blown out from the weft pulling back hole 2b and bent as shown in FIG. 2, and its tip portion Ya is pulled back to the main nozzle 8. It is a thing.

Thus, the posture of the tip end portion Ya of the weft yarn Y to be inserted can be properly maintained without contacting the weft yarn, and the entanglement of the weft yarn tip portion is caused even for the fluffy weft yarn. It is possible to reduce weft insertion errors.

As shown in FIG. 3, the tandem nozzle 1
No. 0 acceleration tube 2 has an air blow-out hole 2a formed below it, and a weft pull-back hole 2b is formed at the upper side opposite to the air blow-out hole 2a. The same action and effect can be obtained by connecting the above and blowing air from the lower side to the upper side in the direction perpendicular to the weft passage 3 and bending the weft so as to blow it up from the weft pull-back hole 2b.

As shown in FIG. 4, the weft pull-back hole 2
When the mesh case 9 is arranged outside b as a support for the blown out weft, the blowout length of the weft Y tends to be constant, and the pullback amount of the weft tip portion Ya can be easily adjusted. it can.

In each of the above examples, air was blown out to the weft passage of the accelerating tube 2 of the tandem nozzle provided upstream of the main nozzle 8. Even if air is similarly blown out to the passage, the same action and effect can be obtained.

[0015]

According to the present invention, in the weft insertion device of the air jet loom, since the weft is pulled back by the blown air, it is possible to perform the non-contact and quick fluffing, and the weaving mixing and weaving which are easy to fluff. Weft insertion errors can be eliminated even when weft insertion of multiple colors is performed, and weaving efficiency can be improved.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view of a weft insertion device in an air jet loom showing an embodiment of the present invention.

2 is an enlarged view of an essential part of a weft insertion device in the air jet loom shown in FIG.

FIG. 3 is a perspective view of a main part of a weft insertion device in an air jet loom showing another example of the present invention.

FIG. 4 is a cross-sectional view of an essential part showing still another embodiment of the present invention.

[Explanation of symbols]

 1 Supply Drum 2 Acceleration Pipe 2a Air Blow-out Hole 2b Weft Pull Back Hole 3 Weft Passage 4 Air Blow Block 4a Air Blow Nozzle 5 Pipe 6 Electromagnetic Valve 7 Air Pressure Control Valve 8 Main Nozzle 9 Support 10 Tandem Nozzle

Claims (2)

[Claims] 1. An air outlet hole and a weft yarn which opposes the air outlet hole in a direction substantially perpendicular to a weft passage upstream of the main nozzle or a weft passage of an acceleration tube of a tandem nozzle provided upstream of the main nozzle. A weft insertion device in an air jet loom, which is provided with a pullback hole. 2. The weft insertion device in an air jet loom according to claim 1, further comprising a weft support member that is pulled back outside the weft pullback hole.