JP2792672B2 - Jet loom weft pull-back device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a jet loom in which weft is inserted by a fluid injection such as water injection, which is provided between a weft holding device and a weft insertion nozzle. The present invention relates to a weft pull-back device that adjusts the length of a weft projecting from a tip.

[Conventional technology]

FIG. 4 is a schematic plan view of a conventional two-color free exchanging device, in which 9.9 is a weft gripper, 10.10 is a water jet nozzle for weft insertion, 12.12 is a tip of the water jet nozzle 10, and 11 is a weft yarn. It is. With such a configuration, since the leading end of the weft projects about 40 to 60 mm from the leading end of the water jet nozzle 10, the water jet nozzle
On the 10.10 side, there is a problem in that when projecting, the protruding weft ends are entangled with each other, causing mis-picking at the next weft insertion. Therefore, in the conventional method, a mechanical pull-back device is provided between the weft gripper 9.9 and the water injection nozzle 12.12, and the weft is bent immediately after the cutting of the weft to pull back the weft 11 projecting from the nozzle tip 12. Such is known.

[Problems to be solved by the invention]

As described above, when a mechanical pull-back device is used, when two or more different kinds of wefts are randomly inserted, not only the structure of the pull-back device itself becomes complicated, but also the timing adjustment becomes difficult, and the high-speed There was a possibility that the tracking ability was lacking.

Therefore, an object of the present invention is to eliminate such a conventional disadvantage.

[Means for solving the problem]

For this purpose, in the present invention, an airflow is generated in a direction that deflects the weft between the weft gripper and the weft insertion nozzle in the lateral direction, and the weft is cut after weft insertion and protrudes from the weft insertion nozzle tip. And a regulating means for regulating the weft amount to be pulled back.

[Action]

According to this configuration, since a force for deflecting the weft between the weft holding device and the weft insertion nozzle in the lateral direction by the airflow acts, the weft is bent by the airflow as soon as it is cut and pulled back. As a result, the length protruding from the nozzle tip becomes shorter. In addition, the amount of weft when the weft is pulled back by the air flow is accurately regulated, and the weft can be reliably inserted without the weft coming out of the weft insertion nozzle.

〔Example〕

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 1, the weft pull-back device according to a preferred embodiment of the present invention has a body 1 disposed between a weft gripper 9 and a water injection nozzle 10. The body 1 has an air blowing port 2 formed therein.
Are connected to an airflow generator (not shown). this,
It is possible to use a blower of a dehydrator as an airflow generating device, and in this case, an air blowing port is connected to an exhaust port of the blower.

The air blowing port 2 is provided with an opening 8 forming a passage for the weft 11.
And an inclined air flow guide surface 6 that guides the air flow through the air flow. As shown in FIG. 2, in this embodiment, the air flow guide surface 6 is inclined at an angle of approximately 45 degrees with respect to the axis of the weft passage, and the flow direction of the air blown from the air blowing port 2 is approximately 90 degrees. It is configured to be deflected by an angle and guided to the outlet 4. In the present embodiment, the inclination angle of the airflow guide surface 6 is set to approximately 45 degrees, but this inclination angle can be set arbitrarily as needed. The discharge port 4 is provided with a gas-permeable regulating body 3 as regulating means, and regulates the weft that has been diverted in the lateral direction by the air current and has entered the air passage 5. It is desirable that the restricting body 3 be a mesh-shaped restriction in order to reduce the resistance to the airflow and ensure the restriction of the weft.

At both ends of the weft insertion opening 8, wear-resistant yarn guides 7 are provided.

In the present invention having such a structure, as shown in FIGS. 1 and 2, the weft 11 is arranged in a straight line from the weft gripper 9 to the water injection nozzle 10 through the opening 8 in a normal state.

Next, the operation of the retraction device according to the preferred embodiment of the present invention will be described. An air flow is constantly supplied to the air blowing port 2, and the weft 11 is subjected to a force to move in the lateral direction. At the time of weft insertion when the fluid is jetted from the water injection nozzle 10 and the weft grasper 9 is in the released state, the weft 11 is pulled by the traction force of the water injection nozzle 10 and becomes linear, and the weft insertion is performed. The weft gripper 9 grips the weft 11, and the weft insertion ends,
Next, after the end of the beating, the weft 11 is cut. By this cutting, the weft 11 projects from the tip 12 of the water jet nozzle 10 by about 40 to 60 mm. Further, by this cutting, the weft 11 is displaced by the force acting in the lateral direction due to the air flow until it is attached to the guide surface 6 and the regulating body 3. As a result, the weft 11 is bent between the weft gripper 9 and the water injection nozzle 10, and the length of the weft 11 protruding from the distal end 12 of the water injection nozzle 10 becomes shorter than the above.

In order to adjust the length of the water injection nozzle 10 protruding from the distal end portion 12, the position of the regulating body 3 with respect to the opening 8 may be changed. For this reason, as shown in FIG. 3, the restricting body 3 is rotatably mounted on the shaft 13 fixed to the body 1 near the guide 7, and the guide surface 6 is formed in an arc shape about the shaft 13. Thereby, it is preferable that the position of the regulating body 3 is easily adjusted. Further, by forming the airflow guide surface in an arc shape, there is an advantage that the airflow can be smoothly guided in a direction parallel to the weft 11. The regulating body 3 is fixed at an adjustment position by a suitable fixing means. In the above-described embodiment, the weft 11 is pulled back by the jet airflow.
A suction airflow may be used.

〔effect〕

As described above, the present invention provides an airflow in a direction that deflects the weft between the weft grasper and the weft insertion nozzle in a direction transverse to the weft, pulls back the weft, cuts after the weft insertion, and projects from the weft insertion nozzle tip. Because the length of the weft is shortened, the device is simpler than a mechanical pull-back device, and no complicated timing adjustment is required. In addition, the weft is pulled back by the air flow, so that the follow-up performance is good even if the speed is increased. There is. In addition, since the regulating means for regulating the amount of the weft to be pulled back is provided, the amount of the weft when the weft is pulled back by the air flow can be accurately regulated,
This has a special effect that the weft can be reliably inserted without the weft coming out of the weft insertion nozzle.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a use state of a weft retraction device according to a preferred embodiment of the present invention, FIG. 2 is a cross-sectional view of the retraction device of FIG. 1, and FIG. FIG. 4 is a cross-sectional view showing a modification, and FIG. 4 is a plan view showing the state of use of a conventional device. Description of Drawing Symbols for Main Parts 1 ... Botty 2 ... Air Inlet 3 ... Regulator 4 ... Outlet 5 ... Internal Space 6 ... Air Flow Guide Surface 7 ... Yarn Guide 8 ... Opening 9 ... Weft grabber, 10 ... Injection nozzle 11 ... Weft, 12 ... Tip

Continuation of front page (58) Field surveyed (Int.Cl. ⁶ , DB name) D03D 47/28-47/36

Claims (1)

(57) [Claims] In a jet loom in which a weft passed through a weft holding device is inserted by a fluid injection of a weft insertion nozzle, the weft is laterally deviated from a weft between the weft holding device and the weft insertion nozzle. Direction air flow, air flow generating means for pulling back the weft that is cut after weft insertion and projecting from the weft insertion nozzle tip, and regulating means for regulating the weft amount to be pulled back are provided. Jet loom pull-back device.