JPH0226958A - Method for picking of air jet type loom - Google Patents

Abstract

PURPOSE:To carry out accurate and optimum picking even if the kind of yarn is changed by operating a position setter for a group of auxiliary nozzles according to the kind of weft yarns and approaching or separating the above- mentioned auxiliary nozzles relatively to a weft yarn guide passage so as to fly the weft yarn to a desired position. CONSTITUTION:A weft yarn 6 jetted from a main nozzle 5 into a weft yarn guide passage 4 is picked with jetted air from plural auxiliary nozzles 10 for successively jetting the air by a relay method. In the process, a feed screw 12 is previously rotated by revolution of a motor 13 according to the kind of weft yarn 6 to vertically move a sliding piece (7a) of a linear bearing 7 and determine the optimum positions of the auxiliary nozzles 10 mounted through a beam 8 on a directional line approaching or separating relatively to the above-mentioned weft yarn guide passage 4. Air pressure fed to the auxiliary nozzles 10 for flying the weft yarn 6 to a desired position is set prior to the picking.

Description

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

<Prior Art> As a conventional weft insertion method for air injection looms, a weft guide path is formed by a row of recesses formed in the reed blades, and a weft guide path is formed along the opening side of the groove-shaped weft guide path. , a plurality of auxiliary nozzles that are hollow rod-shaped and have an injection port on the side wall of the tip are arranged in parallel,
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 insertion method, a central flow of weft insertion air is generated at an optimal position in the cross section of the groove-shaped weft guide passage. This allows the weft yarn to fly effectively, but since its properties (e.g. weight) differ depending on the type of weft yarn (spun yarn, filament yarn, etc.), the conveyance force by the air jetted from the auxiliary nozzle is adjusted. Therefore, conventionally, Japanese Patent Application Laid-Open No. 56-854
As shown in Japanese Patent No. 43, the mounting position of the auxiliary nozzle was adjusted by rotating it around the axis of the main body.

However, adjusting the auxiliary nozzle by rotating it around the axis of the main body only adjusts the intersection angle of the jet airflow from the auxiliary nozzle with respect to the weft guide path, so the auxiliary nozzle may be adjusted depending on the weight of the weft, etc. There is a problem in that this alone cannot make sufficient adjustments, such as when it is desired to change only the conveying force by the air jetted from the air.

In view of such conventional problems, the present invention provides a weft insertion method for an air injection loom that can effectively adjust the conveying force according to the type of weft yarn etc. to obtain an optimal weft insertion condition. The purpose is to

<Means for Solving the Problems> For this reason, the present invention forms a weft guide passage by a row of concave portions formed in a liquid state, and along this weft guide passage, a hollow rod-shaped material having an injection port on the side wall of its tip end is provided. In the weft inserting device of an air injection loom, a plurality of auxiliary nozzles are arranged in parallel, and the auxiliary nozzles are aligned with the axis of the main body. A positioning device is provided to set the position of the weft by being movable in the direction toward and away from the weft guide passage, and the weft is caused to fly to a desired position in relation to the positioning of the auxiliary nozzle by the positioning device. The pressure value of the air supplied to the auxiliary nozzle is set prior to weft insertion.

In the above configuration, the auxiliary nozzle position setting device can set the position of the auxiliary nozzle by moving it in the axial direction of the main body and in the direction toward and away from the weft guide passage. The conveyance force can be easily changed by moving the injection port of the auxiliary nozzle toward or away from the weft guide path depending on the weight or the like.

Furthermore, in the case of an auxiliary nozzle that is hollow and rod-shaped and has an injection port on the side wall of its tip end, when the pressure of the air supplied to the auxiliary nozzle is changed, the injection angle from the injection port changes. That is,
In this type of auxiliary nozzle, the pressure P of the air supplied to the auxiliary nozzle and the injection angle Y (the axis of the injection port and the direction of the jet air flow in a plane that includes the axis of the auxiliary nozzle body and the axis of the injection port) For example, the fourth
There is a relationship as shown in the figure.

Therefore, when changing the position of the auxiliary nozzle and still wishing to maintain the current position of the center flow of weft inserting air in the cross section of the weft guide passage, in connection with changing the position of the auxiliary nozzle, This can be done by finding a spray angle Y that is sufficient to compensate for the change, and adjusting the pressure P of the air supplied to the auxiliary nozzle so that this spray angle Y is obtained.

Thereby, even if the yarn type changes, the weft yarn can be easily and accurately run at the optimum position.

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

Referring to FIGS. 1 and 2, a reed 2 is attached to a reed holder l that makes a reciprocating angular movement in the back and forth direction of the loom in synchronization with the rotation of the loom main shaft, and a reed 3 is formed in the liquid state 3 of the reed 2. ing.

Therefore, the groove-shaped weft guide passage 4 is formed by this row of recesses 3a.
is formed.

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.

A linear bearing 7 called an LM guide is attached to the weft insertion side and the non-cotton insertion side (not shown) of the front surface of the reed holder 1 that is inclined with respect to the reed 2, and the slider 7a thereof is slidable in the vertical direction. There is. Then, a beam 8 is held between the sliders 7a, and auxiliary nozzles 1O are attached to the beam 8 through nozzle holders 9 at predetermined intervals in the weft insertion direction.

The auxiliary nozzle 10 has a hollow rod shape with a flat tip, and has an injection port 11 formed in the side wall of the tip on the side opposite to weft insertion. 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.

Further, a feed screw 12 is screwed into the slider 7a of the area bearing 7 in the sliding direction, and the feed screw 12 is connected to the output shaft of a motor 13 fixed to the reed holder 1 so as to be rotatable. be.

Therefore, by rotating the motor 13 in an arbitrary direction, the feed screw 12 is rotated to move the slider 7a of the linear bearing 7 up and down, and the auxiliary nozzle lO attached to this via the beam 8 is moved up and down. It can be moved.

Here, motor 13. Feed screw 12. A position setting device for the auxiliary nozzle 10 includes the linear bearing 7 and the beam 8.

Next, the action will be explained.

The weft 6 ejected from the main nozzle 5 into the weft guide path 4 is sequentially ejected from the weft insertion side in a relay manner through the auxiliary nozzle 1.
The weft is inserted by being blown away by air jetted from zero.

Here, the vertical position of the auxiliary nozzle 10 is determined in advance according to the type of the weft 6, and the motor 13 is rotated in an appropriate direction in accordance with this, thereby rotating the feed screw 12 and causing the linear bearing 7 to slide. If the child 7a is moved up and down and the auxiliary nozzle lO attached to it via the beam 8 is moved in the vertical direction, the auxiliary nozzle 10 can be moved toward or away from the weft guide path 4 depending on the type of weft 6. It can be set at the optimal position on the direction line, and the conveying force can be adjusted.

Specifically, in the case of a heavy weft 6, the auxiliary nozzle 10 is moved upward to approach the weft guide path 4 to ensure conveying force.

Although the conveying force is adjusted by changing the vertical position of the auxiliary nozzle 10 in this way, it is preferable not to change the position of the center flow of the weft insertion air.

In such a case, as shown in FIG.
The pressure P of the air supplied to the auxiliary nozzle IO via the surge tank 16 and the electromagnetic valve 17 is adjusted by adjusting the regulator 15 as a pressure adjustment device provided on the pressure air extraction side of No. 4.

That is, in the auxiliary nozzle 10 that is hollow and rod-shaped and has the injection port 11 on the side wall of the tip, the direction of injection from the injection port 11 does not coincide with the axis of the injection port 12, and the axis of the injection port 11 and the direction of the jet air flow are different. An angle (spray angle) Y is created between the two.

This injection angle Y (the axis of the auxiliary nozzle 10 body and the injection port 11
The elevation angle Y) between the axis of the injection port 11 and the direction line of the ejected air flow in a plane including the axis of the auxiliary nozzle 10 changes when the pressure P of the air supplied by the pipe to the base end of the auxiliary nozzle 10 is changed. . That is, between the pressure P of the air supplied to the auxiliary nozzle 10 and the injection angle Y from the injection port 11,
There is a relationship as shown in FIG. 4, and when the pressure P is increased, the injection angle Y becomes smaller.

Therefore, when the vertical position of the auxiliary nozzle 10 is changed, the pressure of the air supplied to the auxiliary nozzle 10 is adjusted accordingly to change the injection angle Y. For example, as shown in FIG. If the position of the injection port 11 is changed from the 11th position to the 12th position above it,
The pressure P of the air supplied to the auxiliary nozzle 10 is increased, the injection angle Y is decreased from Y to Yt, and the position C of the center flow of the weft insertion air is kept the same.

6 and 7 show other embodiments of the position setting device.

In this embodiment, a feed screw 21 is provided on the front surface of the reed holder 1 with its axis in the weft insertion direction, and is rotatable by a motor 22. The sliders 23 are screwed together, and each slider 23 is fitted into a groove 24 formed on the front surface of the reed holder 1 to be slidably guided in the weft insertion direction.

A nozzle holder 25 is attached to each slider 23, and the auxiliary nozzle 10 is fitted into the nozzle holder 25 so as to be slidable in the axial direction thereof. A feed screw 26 is provided in the vertical direction on the nozzle holder 25 and is screwed into a protrusion 27 fixed to the auxiliary nozzle 10, so that the feed screw 26 can be rotated by a motor 28.

Therefore, by rotating the motor 22, the slider 2
3, the nozzle holder 25 can be moved in the weft insertion direction to adjust the position of the auxiliary nozzle 10 in the weft insertion direction.
By rotating 8, the auxiliary nozzle 10 can be moved vertically with respect to the nozzle holder 25, and the vertical position of the auxiliary nozzle IO can be adjusted.

In the above, it has been explained that the vertical position of the auxiliary nozzle 10 is adjusted during the preparation of the loom, but in some cases, it may be adjusted up and down in synchronization with the rotation of the loom main shaft during weaving, and the weft may be adjusted only during weft insertion. It may be moved closer to the guide passage 4 and evacuated in other areas.

<Effects of the Invention> As explained above, according to the present invention, the auxiliary nozzle is movable in the axial direction of the main body and in the direction toward and away from the weft guide path, and is provided with a position setting device for setting the position. Therefore, by moving the auxiliary nozzle toward or away from the weft guide path depending on the weight of the weft, etc., the conveying force can be easily changed, and the optimum weft insertion condition can be easily obtained. is obtained.

Further, in connection with the position setting of the auxiliary nozzle by the position setting device, the pressure of the air supplied to the auxiliary nozzle is adjusted by a pressure adjustment device, thereby changing the position of the auxiliary nozzle. The position of the center flow of weft insertion air in the cross section can be maintained at the current position, and this provides the effect that even if the yarn type changes, the weft yarn can be easily and accurately flown to the optimum position.

[Brief explanation of the drawing]

FIG. 1 is a front view of essential parts of an air injection loom showing an embodiment of the present invention, FIG. 2 is a side sectional view of the same, FIG. 3 is a diagram showing an air supply system to the auxiliary nozzle, and FIG. The figure shows 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. FIG. 6 is a front view of essential parts of an air injection loom showing another embodiment, and FIG. 7 is a side sectional view of the same. 2... Reed 3... Liquid state 3a... Concavity 4
...Weft guide passage 5...Main nozzle 6...
Weft thread 7...Nilia bearing 7a...Slider 8...Beam 10...Auxiliary nozzle 11...
Injection port 12...Feed screw 13...Motor 1
4... Pressure air supply source 15... Regulator
21...Feed screw 22...Motor 23.
...Slider 26...Feed screw 28...Motor patent applicant Nissan Motor Co., Ltd. Agent Patent attorney Goriki Sasashima Fujio P (in g/cm") Figure 5 Figure 3

Claims (1)

[Claims] A weft guide path (4) is formed by a row of recesses (3a) formed in the reed feathers (3), and along this weft guide path (4), a hollow rod-shaped jet hole (11) is provided on the side wall of the tip. A plurality of auxiliary nozzles (10) are arranged in parallel, and these auxiliary nozzles (1
In an air-injection type loom, the auxiliary nozzle (10) is oriented in the axial direction of the main body and in the direction of the weft guide. A position setting device (7, 8, 12,
13), and an auxiliary nozzle (10
), the pressure value of the air supplied to the auxiliary nozzle (10) is set prior to weft insertion in order to make the weft fly to a desired position. Weft insertion device.