JPH0226959A - Method for controlling picking of fluid jet type loom - Google Patents

Abstract

PURPOSE:To carry out the optimum picking according to the kind of weft yarn without regulating mounting positions of auxiliary nozzles by determining a jetting angle so as to optimize the position in the central stream of weft yarn conveying air streams in a weft yarn guide passage according to the kind of the weft yarn and controlling the feed air pressure. CONSTITUTION:A weft yarn 6 jetted from a main nozzle 5 into a weft yarn guide passage 4 is picked with a jetted air stream from plural auxiliary nozzles 8 for successively jetting air from the picking side by a relay method. In the process, an elevation angle (Y) (jetting angle) of the axial line of jetting tips 9 of each auxiliary nozzle 8 changing by the feed air pressure to the direction line of the jetted air streams is preset so as to optimize the position of the central stream in the conveying air streams in the above-mentioned guide passage 4 according to the kind of the weft yarn 6. Thereby, flying optimum for the weft yarn 6 is carried out without regulating the mounting positions of the afore-mentioned auxiliary nozzles 8 according to the kind of the weft yarn 6.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a weft insertion control method for an air injection loom that performs weft insertion using an auxiliary nozzle.

<Prior Art> As a conventional weft inserting device for an air injection loom, a weft guide passage is formed by a row of recesses formed in the reed blades, and a weft guide passage is formed on the groove on the opening side of the weft guide passage along the passage. Multiple auxiliary nozzles that are hollow rod-shaped and have injection ports on the side wall of the tip are arranged side by side.
Some weft insertion is performed by blowing the tip of the weft yarn in the weft guide passage in a relay manner using air jetted from these auxiliary nozzles.

<Problems to be Solved by the Invention> By the way, in this type of weft inserting device, a central flow of weft inserting air is generated at an optimal position in the cross section of the groove-shaped weft guide passage. This effectively makes the weft yarn fly, but since its properties (e.g. weight) differ depending on the type of weft yarn (spun yarn, filament yarn, etc.), it is necessary to adjust the jetting direction of the auxiliary nozzle. Conventionally, the mounting position of the auxiliary nozzle was adjusted (see Japanese Patent Application Laid-open No. 85443/1983).

However, since a large number of auxiliary nozzles are used, there is a problem in that it is extremely complicated to adjust the mounting positions of all of these nozzles.

SUMMARY OF THE INVENTION In view of these conventional problems, it is an object of the present invention to provide a weft insertion control method for an air-jet textile machine that can obtain the optimum injection direction according to the type of weft yarn through simple adjustment.

Means for Solving the Problems> For this reason, the present invention provides an auxiliary nozzle that is hollow and rod-shaped and has an injection port on the side wall of its tip. Focusing on the fact that the angle changes, as shown in Figure 1, the optimal spray angle from the injection port of the auxiliary nozzle is determined in advance according to the type of weft yarn, and the jet is supplied to the auxiliary nozzle according to the determined spray angle. The optimum injection angle is obtained by setting the pressure of the air and controlling it to that pressure.

In other words, for an auxiliary nozzle that is hollow and rod-shaped and has an injection port on its side wall, the pressure P of the air supplied to the auxiliary nozzle and the injection angle Y (in a plane that includes the axis of the auxiliary nozzle body and the axis of the injection port) Since there is a relationship as shown in FIG. 2, for example, between the elevation angle Y) between the axis of the jet nozzle and the direction line of the jet air flow, weft inserting air in the weft guide passage is determined in advance according to the type of weft. The injection angle Y from the injection port of the auxiliary nozzle is determined so that the position of the center flow is optimal, and the pressure P of the air supplied to the auxiliary nozzle is set and controlled so that this injection angle Y is obtained. In this way, the optimum injection angle Y is obtained depending on the type of weft yarn.

<Example> The present invention will be explained in detail below.

Referring to FIG. 3, a reed 2 is attached to a reed holder 1 that makes a reciprocating angular movement in the back and forth direction of the textile machine in synchronization with the rotation of the main shaft of the loom, and a reed blade 3 of the reed 2 is formed with a recess 3a. Therefore, a groove-shaped weft guide passage 4 is formed by this row of recesses 3a.

A main nozzle 5 is attached to the weft insertion side end of the reed holder 1, and is adapted to inject the weft yarn 6 into the weft guide path 4 during weft insertion.

Auxiliary nozzles 8 are attached to the front surface of the reed holder 1 through nozzle holders 7 at predetermined intervals in the weft insertion direction.

The auxiliary nozzle 8 has a hollow rod shape with a flat tip, and has an injection port 9 formed in the side wall of the tip on the side opposite to the weft insertion side. It is installed so that the jetted air is directed diagonally toward the weft guide path 4 on the side opposite to the weft insertion side.

Therefore, the weft yarn 6 ejected from the main nozzle 5 into the weft guide path 4 is blown away by the air jetted from the auxiliary nozzle 8, which is sequentially jetted in a relay manner, starting from the weft insertion side, and is inserted into the weft.

In such an auxiliary nozzle 8, the direction of injection from the injection port 9 does not coincide with the axis of the injection port 9, and an angle (injection angle) Y is created between the axis of the injection port 9 and the direction of the jet air flow. This injection angle Y (elevation angle Y between the axis of the injection port 9 and the direction line of the injection air flow in a plane including the axis of the main body of the auxiliary nozzle 8 and the axis of the injection port 9) is determined at the base end of the auxiliary nozzle 8. When the pressure P of the air supplied by the hepaibe 10 is changed,
Change. That is, there is a relationship between the pressure P of the air supplied to the auxiliary nozzle 8 and the injection angle Y from the injection port 9 as shown in FIG.
becomes smaller.

Therefore, when operating the loom, the weft 6
The injection angle Y is determined so that the center flow of the weft inserting air flow in the weft guide passage 4 is optimally positioned according to the type of weft yarn (spun yarn, filament yarn, etc.). Find the injection angle Y. Then, the determined injection angle Y
The pressure P is set according to the graph in FIG.

When the pressure P is set in this way, as shown in FIG. The pressure P of air supplied to the auxiliary nozzle 8 is controlled.

As a result, the injection angle Y changes in relation to the pressure P, and the optimum injection angle Y can be obtained depending on the type of weft 6, and the position of the center flow of the weft inserting air flow in the weft guide passage 4 is adjusted to the position of the weft 6. The most suitable one will be depending on the type.

The pressure P may be set by constructing a sequence circuit according to the flow described above, so that when the type of weft is input manually, the pressure is automatically set.

It should be noted that there is a close relationship between the pressure supplied to the auxiliary nozzle and damage to the weft yarn (filament breakage, etc.).In other words, if the pressure is increased too much, filament breakage, etc. will occur in the weft yarn, resulting in fabric flaws. Because of this,
The pressure is set with this point in mind.

<Effects of the Invention> As described above, according to the present invention, an effect can be obtained in that the optimum jetting direction according to the type of weft can be obtained by simple adjustment without adjusting the mounting position of the auxiliary nozzle.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing an overview of the method of the present invention, Fig. 2 is a diagram showing the relationship between the pressure of air supplied to the auxiliary nozzle and the injection angle from the injection port of the auxiliary nozzle, and Fig. 3 is a diagram showing an air injection loom. FIG. 4 is a perspective view of the main parts of the auxiliary nozzle. 2... Reed 3... Reed feather 3a... Recessed part 4
... Weft guide passage 5 ... Main nozzle ... Auxiliary nozzle 9 ... Nozzle supply source 12 ... Regulator 6 ... Weft 8 11 ... Pressure air supply Patent applicant Nissan Motor Co., Ltd. Attorney Fujio Sasashima

Claims (1)

[Claims] A weft guide passage is formed by a row of recesses formed in the reed,
Along this weft guide path, a plurality of auxiliary nozzles, which are hollow rod-shaped and have an injection port on the side wall of the tip, are arranged in parallel, and the air jetted from these auxiliary nozzles blows the weft within the weft guide path to insert the weft. When performing this, the optimum injection angle from the injection port of the auxiliary nozzle is determined in advance according to the type of weft, the pressure of the air supplied to the auxiliary nozzle is set according to the determined injection angle, and the pressure is controlled to that pressure. A weft insertion control method for an air injection loom, characterized by obtaining an optimal injection angle.