JPS61215739A - Wefting control in air jet type 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] (Industrial Application Field) This invention relates to a method for controlling weft insertion in an air injection loom, and more specifically, it relates to a method for controlling weft insertion in an air injection loom. The present invention relates to an improvement in a weft insertion control method that unwinds and inserts the weft using the traction force of a main nozzle without causing a restricted flight.

(Prior Art) In the following description, in the entire system, the side closer to the weft yarn feeder is called 1 upstream J, and the side closer to the main nozzle is called r downstream J.

In recent years, the weft insertion speed of air-injection looms has become significantly higher as the looms have become faster and wider. The speed suddenly drops to a low speed, and at this time a very large tension is applied to the weft. This tendency occurs when a locking bin is used to control weft insertion as described above, when the weft yarn flying at high speed is stopped by the locking bin and the flying speed suddenly increases. This is especially noticeable since the value becomes zero. That is, at the end of weft insertion, the locking bin advances toward the storage drum and engages with the weft, but at this time, the weft yarn is suddenly stretched tight between the locking bin and the main nozzle. As a result, a momentary high tension is generated in the weft yarn. This tension often exceeds the strength of the weft itself, and as a result, loosening of the weft due to weft breakage or bouncing occurs frequently, making it difficult to obtain a level of utilization and fabric quality that is satisfactory for production management. This was a major obstacle to increasing speed and width.

In order to avoid such inconvenience, for example,
No. 859 proposes applying a brake to the unwinding weft yarn using a braking member immediately before the end of weft insertion to reduce the unwinding speed, thereby alleviating the impact when the locking bin is locked. . However, direct contact of the braking member with the weft yarn during unwinding in this way is not only undesirable as it adversely affects the quality of the weft yarn such as fluffing, but also has a complicated structure and is difficult to achieve effective braking. is difficult to set.

(Objective of the Invention) The object of the present invention is to eliminate the above-mentioned inconveniences caused by the use of locking bins without affecting the quality of the weft yarn, thereby achieving a satisfactory level of operation rate in terms of production management. The purpose is to obtain textile quality.

(Basic Structure of the Invention) In the weft insertion method described above, the present invention blows air at an appropriate pressure from a direction substantially perpendicular to the weft yarns downstream of the storage drum during a certain period immediately before the end of weft insertion. The gist of this is to give the weft some play due to the resistance caused by the weft.

(Embodiment) FIG. 1 shows an example of the present invention, in which air at an appropriate pressure is blown onto the weft W immediately upstream of the main nozzle. The weft W is supplied onto the storage drum I by a flyer 2 which is rotationally driven by a motor 3, unwound by the traction force of a main nozzle 6 under the control of a locking bin 4, and inserted into the warp opening. In this example, the injection nozzle 10 is located immediately upstream of the main nozzle 6.
It is attached to the reed holder 5 with its jet nozzle facing the flight path of the weft W, and air at an appropriate pressure is sprayed onto the weft W from the jet nozzle 10 for a certain period immediately before the end of weft insertion. Then, a loop-shaped play P is created in the weft W, and at the same time, the traction of the main nozzle 6 is braked. Immediately after this, the locking pin 4 engages with the weft W, but since the play P is formed, the weft W does not suddenly become taut, and therefore a momentary high tension is applied to the weft W. can be effectively avoided.

FIG. 2 shows another example of the present invention, in which air at a suitable pressure is blown onto the weft W immediately downstream of the main nozzle. In this example, the injection nozzle 20 is attached to the reed holder 5 at a position immediately downstream of the main nozzle 6 with its injection port facing the flight path of the weft yarn W. As in the case of FIG. 1, play P is generated in the weft yarn W by blowing air at an appropriate pressure onto the weft yarn W.

FIG. 3 shows still another example of the present invention, in which air at an appropriate pressure is blown onto the weft W at a position within the weft opening. In this example, an injection nozzle 3o, which is appropriately controlled separately from the auxiliary nozzle at a position considerably downstream of the main nozzle 6, is attached to the reed holder 5 with its injection port facing the flight path of the weft yarn W. As in the case of FIG. 1, by blowing air at an appropriate pressure onto the weft
A play P is generated.

(Effects of the Invention) According to the present invention, air at an appropriate pressure is injected to the weft immediately before the locking bin engages with the weft to generate play.
When the locking bin is engaged, this acts as a kind of coupling and effectively prevents instantaneous high tension from being applied to the weft yarn, so weft breakage and weft bounce are significantly improved, and play is generated appropriately. Since it uses pressurized air and has a structure that allows the weft to be woven without any parts coming into contact with the weft, there is no fuzz on the weft, which greatly improves the operating rate of the loom and the quality of the fabric. This makes it possible to move at higher speeds and over a wider range. Furthermore, since air at an appropriate pressure is blown onto the weft at an appropriate timing, the structure is simple and the settings thereof are also easy.

[Brief explanation of the drawing]

1 to 3 are side views showing various embodiments of the present invention.

Claims (1)

[Scope of Claims] [1] When weft yarn for one pick is unwound from the storage drum under the control of the locking pin by the traction force of the main nozzle without any restraint flying, and weft yarn is inserted, there is a moment immediately before the end of weft insertion. An air injection type characterized in that during the period, play (P) is generated in the weft due to resistance caused by blowing air at an appropriate pressure from a direction substantially perpendicular to the weft on the downstream side of the storage drum. Weft insertion control method in a loom. [2] The method according to claim [1], wherein the above-mentioned blowing of air at an appropriate pressure is performed immediately upstream of the main nozzle. [3] The method according to claim [1], wherein the above-mentioned blowing of air at an appropriate pressure is performed immediately downstream of the main nozzle. [4] The method according to claim [1], characterized in that the above-mentioned blowing of air at an appropriate pressure is performed downstream from the main nozzle and within the weft opening position.