JPS6253445A - Apparatus for preventing slackening of weft yarn in weft yarn storage apparatus of 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> The present invention relates to a weft yarn slack prevention device for preventing loosening of the weft yarn between it and a yarn supplying body in a weft yarn storage device of a loom.

<Prior art> As a conventional weft storage device for m-machines, for example,
The one described in Japanese Patent No.-174654 is known.

To explain this with reference to FIG. 4, the weft yarn 4 from the yarn feeder 3 is wound around the drum 1 by the winding guide 2 which rotates relatively around the drum 1, and the end of the weft insertion nozzle side of the drum 1 is The locking body 5 placed in the weft 4 is driven by an electromagnetic actuator 6 to be pulled out from the drum surface at a predetermined timing, and the weft 4 is inserted by the fluid jet of the weft insertion nozzle 7, and the weft 4 is inserted by entering the drum surface. 4 is locked to complete weft insertion. 8°9 is a weft guide. 10 is a weft detector that detects that the weft 4 equivalent to one weft insertion pick or more is wrapped around the drum 1; 11 is a control circuit; Wrapping guide 2 when not detected
A predetermined amount of weft yarn 4 is activated.
When winding is detected, the motor 12 is stopped.

In addition, the applicant has proposed that in the above-mentioned apparatus, the drum 1
To eliminate the problem caused by the winding guide 2 rotating due to inertia and winding the weft 4 further when the drive of the motor 12 is stopped after detecting that a predetermined amount of the weft 4 has been wrapped around the weft 4. proposed to provide a braking device 13 that brakes the rotation of the winding guy 120 when the drive of the motor 12 is stopped and the weft detector 10 detects the winding of a predetermined amount of the weft 4. Of course, the braking device 13 is controlled by the control circuit 11.

<Problems to be Solved by the Invention> However, in this case, when the braking device 13 is activated, the winding guide 2 is suddenly stopped and the winding of the weft yarn 4 around the drum 1 is stopped. The weft yarn 4 is unwound from the yarn supplying body 3 due to inertia, and becomes loose between the yarn supplying body 3 and the winding guide 2. If the winding guide 2 suddenly starts winding the weft yarn 4 again in such a slack state, the weft tension will suddenly increase and if the yarn is weak, it will break. In addition, the winding pitch on the drum 1 may be uneven, and the threads may run over each other, causing flying resistance during weft insertion, or may become tangled with each other and break.

SUMMARY OF THE INVENTION In view of these problems, an object of the present invention is to prevent the weft from loosening between a yarn supplying body and a winding guide when the winding guide stops.

<Means for Solving the Problems> For this reason, the present invention provides an air injection device that bends the weft by applying an air flow to the weft from the lateral direction between the yarn supplying body and the winding guide. This is what I did.

<Function> The above-mentioned air injection device uses its air flow to blow the weft yarn from the lateral direction, and when the weft yarn is loosened, the weft yarn is blown away by the air flow and tension is applied to the weft yarn.

Therefore, loosening of the weft threads is prevented.

(Example) An example of the present invention will be described below based on the drawings.However, the same parts as those in FIG. 4 shown as a conventional example are given the same reference numerals, and the explanation will be omitted.

Referring to FIG. 1, an air injection device 15 is arranged between the yarn supplying body 3 and the winding guide 2.

As shown in FIG. 2, this air injection device 15 has a slit 19 in the side wall in front of the injection port 17 of a housing 18, which has a thread guide tube 16 at its axial center and an injection port 17 formed around the casing 18. A guide cylinder 20 having a diameter is provided. A guide 21 is fixed to the end of the guide tube 20 on the side of the yarn supplying body 3.

The weft yarn 4 is drawn through the guide 21, enters the guide tube 20, passes through the yarn guide tube 16, and is guided to the winding guide 2.

The injection port 17 is connected to a pressurized air supply source or a blower via an inlet 22. During operation of the loom, air is injected into the guide cylinder 20 from the injection port 17. Therefore, after this airflow pulls the weft yarn 4 from the winding guide 2 side, most of it is blown out from the slit 19 of the guide tube 20 upward in the figure. In this way, force is applied to the weft yarn 4 from the lateral direction.

Next, the action will be explained.

The winding guide 2 is rotationally driven by the motor 12, and the weft 4
When the weft thread 4 is wound around the drum 1, the weft thread 4 runs to the right in FIG. At this time, since the weft yarn 4 is pulled toward the yarn supplying body 3 side by the air ejected from the injection port 17, a tension corresponding to this pulling force is applied to the weft yarn 4.

When the weft detector 10 detects that a predetermined amount of the weft 4 has been wound on the drum 1, the driving of the motor 12 is stopped and the braking device 13 is activated to suddenly brake the winding guide 2. At this time, as described above, the weft yarn 4 is excessively unwound from the yarn supplying body 3 due to inertia.
The weft threads 4 are ejected from the slits 19 and are blown into a U-shape as shown by the dashed line in the figure by the airflow acting laterally on the weft threads 4, and are kept on standby with a predetermined tension. Therefore, even when the weft yarn 4 is not pulled out from the yarn supplying body 3, a predetermined tension is applied between the yarn supplying body 3 and the winding guide 2.

Thereafter, when the braking device 13 is deactivated and the winding guide 2 is rotationally driven by the motor 12, the weft yarn 4 is pulled to the right in FIG. 2, and the tension of the weft yarn 4 increases from the predetermined value. No weft breakage occurs. That is, compared to the case where the tension of the weft yarn 4 suddenly increases from a relaxed state, since the tension increases from a predetermined tension, the difference in the force applied to the weft yarn 4 is small in the present invention, so the impact force on the weft yarn 4 is small. Therefore, thread breakage can be eliminated.

FIG. 3 shows another embodiment of the air injection device 15.

In this example, the guide cylinder 20 is not provided on the yarn supplying body 3 side of the housing 18, and the deflection injection port 23 is provided at the injection port 17 portion of the case 18. This deflection injection port 23 is connected to the introduction port 22 and the communication path 2.
It is connected by 4.

According to this structure, the air ejected from the injection port 17 is
is pulled from the winding guide 2 side, and the deflection injection port 23
is deflected upward in the figure by the jet of air from the Therefore, the loosened weft yarn 4 receives a force in the lateral direction due to this deflection, and waits in a U-shape with a predetermined tension. This deflection injection port 23
Pressurized air may be supplied to the inlet from a route other than the inlet 22.

Note that the air injection device 15 may be controlled so as to perform air injection only while the winding guide 2 is stopped.

<Effects of the Invention> As explained above, according to the present invention, even if the weft yarn is loosened between the yarn supplying body and the winding guide, the air flow from the air injection device is applied to the weft yarn in the lateral direction, so that a predetermined effect can be achieved. Since the weft is kept on standby under tension, it is possible to prevent the problem of the weft being cut when it is pulled out again.

In addition, it is possible to eliminate weft yarn breakage due to uneven winding pitches, uneven flying, and entanglements at the winding portion.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a weft storage device showing one embodiment of the present invention, FIG. 2 is a sectional view of the air injection device in FIG. 1, and FIG.
The figure is a cross-sectional view of an air injection device showing another embodiment, and FIG. 4 is a cross-sectional view of a weft storage device showing a conventional example. 1... Drum 2... Winding guide 3... Yarn feeder 4... Weft yarn 15... Air injection device 16
... Thread pipe 17 ... Spray port 19 ... Slit 20 ... Guide tube 23 ... Deflection jet port

Claims (1)

[Claims] The weft (4) pulled out from the yarn feeder (3) by the winding guide (2) that rotates relatively around the drum (1) is transferred to the drum (1).
In a weft storage device for a loom, in which the weft yarn is wound and stored for one or more picks on the weft yarn, the weft yarn (4) is Air injection device (15) that bends the weft (4) by applying an air flow
) A weft slack prevention device in a weft storage device of a loom, characterized in that the device is provided with: