JPS6253617B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a weft insertion assisting device for a fluid jet loom.

In a fluid jet loom, weft yarns are inserted into warp openings formed by heddles using fluid jet nozzles. Generally speaking, there are two types of main nozzles for this fluid jet: those that are installed on the sley and move back and forth as one with the sley, and those that are fixed at a predetermined position separately from the sley. has been done.

Particularly in the case of a fluid jet loom in which the main nozzle is installed on a sled, the main nozzle 7 is located at the front and rear positions B and D in the warp direction, as shown in FIG.
moving back and forth between. Here, the period from position A through B to C corresponds to the weft insertion period, and position D corresponds to the weft striking position. In addition, the weft gripping device 3 opens between positions A→B→C of the main nozzle 7, and opens between positions C→D→
It is closed between A.

When the main nozzle 7 moves from the position C to the position D, the length of the weft section from the weft gripping device 3 to the main nozzle 7 increases by the difference length Δl.

When the main nozzle 7 completes weft insertion (position C), the weft gripping device 3 closes and grips the weft W. Therefore, when the main nozzle 7 reaches the D position, there is an extra amount of weft W corresponding to the difference length Δl. Tension will be applied to. Therefore, when the weft yarn W is cut by the cutter 9 after weft beating is completed at position D, a so-called spring back occurs in the weft yarn W due to this tension, and the length of the yarn end coming out from the tip of the main nozzle 7 becomes short. It becomes like this,
If the weft tip comes out of the nozzle, it becomes impossible to insert the weft from the next time onwards.

As a countermeasure to this problem, it has been proposed to prevent the springback of the weft by blowing out a fairly strong air current from a main nozzle after the weft is cut.

However, when weft yarns are exposed to such strong air currents, so-called blow-through tends to occur in the case of spun yarns, etc., which have a structurally weak bonding strength. Further, even in the case of filament yarn, there are problems such as filament cracking. In addition, the loss of power due to additional jetting of airflow etc. could not be overlooked.

In this invention, in order to prevent so-called spring back from occurring in the weft yarn when cutting the weft yarn, an excessive tension is not applied to the weft yarn when cutting the weft yarn. Furthermore, at the time of the initial injection of the main nozzle, the long yarn end coming out from the tip of the main nozzle is used to increase the acceleration force of the weft yarn, and the yarn end of the weft can easily enter the groove formed in the reed, so that the weft yarn The aim is to stabilize the flight of the player.

That is, the gist of this invention is to provide a weft controller between the main nozzle and the weft gripper that can appropriately change the weft length between the weft gripper and the main nozzle in response to the movement of the main nozzle. It is.

The present invention will be described in more detail below based on the accompanying drawings.

FIGS. 2A and 2B and FIG. 3 are plan views showing the movement of the weft insertion assisting device of the present invention. The weft yarn W pulled out from the weft storage tube 1 is passed through the first thread guide 5
The weft thread is guided by the weft gripper 3, passes through the second and third thread guides 5b and 5c, and is inserted from the fluid injection main nozzle 7. A weft controller is installed at a predetermined position between the weft gripper 3 and the main nozzle 7 to adjust the length of the weft W between the weft gripper 3 and the main nozzle 7 in accordance with the movement of the main nozzle 7. 6 is provided. This weft controller 6 is shown in Fig. 2A.
As shown in , when the main nozzle 7 is at position A at the start of weft insertion, it is at position a.

When the main nozzle 7 completes weft insertion and moves to the weft striking position D, the weft controller 6 also moves to position B while pushing the weft W along with the movement of the main nozzle 7, as shown in FIG. 2B. . When the weft controller 6 moves from position a to position b, the weft gripping device 3 is closed. Moreover, the weft W has not yet been cut and continues to the edge of the cloth. Therefore, by moving the weft controller 6 from position a to position b, the weft yarn W that has already been inserted is pulled back through the main nozzle 7 from the warp opening. This weft W
The extra length is at least the difference length Δl shown in FIG.
There must be minutes.

At the time of weft stroke, the foot controller 6 is in position b.
, and after the weft stroke, it starts moving toward position a. Therefore, when cutting the weft yarn with the cutter 9, the weft yarn W has an extra length and no extra tension is applied.

As a drive mechanism for the above-mentioned weft controller 6, there is, for example, one shown in FIG. That is,
A cam 10 is fixed at a predetermined phase angle to a camshaft 11 that rotates synchronously with the main shaft of the loom.
0 is attached with a cam ball 12 and a lever 9 that transmits the movement of the cam ball 12 to the weight controller 6.

A tension spring 14 is attached to a predetermined position of the lever 9, and the cam ball 12 is lightly pressed against the cam surface by this spring 14.

When the camshaft 11 rotates in the direction P in the figure, the accompanying cam rotation is transmitted to the weft controller 6 through the cam ball 12, the lever 9, and other intermediate links, and the weft controller 6 moves to the position a, as described above. Move between b.

The shape of the cam 10 is preferably as shown in the diagram shown in FIG. That is,
The fall starts from the crank angle of 0 degrees in the first cycle, reaches the lowest point around the crank angle of 15 degrees, maintains the lowest point until around 90 degrees, and then starts a slight rise around this 90 degrees. It immediately falls down. This minute rise is for the above-mentioned weft controller 6 to momentarily loosen the weft W during this period in order to remove the weft stuck to the weft gripping device 3, and this period may be set as necessary. That's fine.

After this instantaneous rise and fall, the crank angle
It maintains the lowest point until around 240 degrees, starts to rise after 240 degrees, and after reaching the highest point, it maintains the highest point until the crank angle is 360 degrees. Then, it moves on to the next cycle and repeats this operation from then on.

By installing a weft insertion auxiliary device on a fluid jet loom in which the main nozzle moves together with the sled, spring back when cutting the weft can be prevented.
As a result, at the time of initial injection from the main nozzle, the long yarn end is used to increase the acceleration force of the weft flight, and this yarn end also enters the groove formed in the reed, making it possible to stabilize the weft flight. .

This invention is not only applicable to looms in which the main nozzle moves together with the sleigh, but also to looms in which the main nozzle is attached separately from the sled, from the standpoint of preventing springback. I can do it.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing the weft insertion device and its surroundings of a conventional fluid jet loom, and Figs. 2A and B show the movement of the main nozzle and weft controller of a loom using the weft insertion auxiliary device of the present invention. 3 is an enlarged view of the same part, FIG. 4 is a partial perspective view showing the structure of the weft insertion auxiliary device of this invention, and FIG. 5 is a movement of the weft insertion auxiliary device of this invention. This is a diagram showing an example. 1... Weft storage tube, 3... Weft gripper, 5...
Thread guide, 6...Weft controller, 7...Main nozzle, 9...Katsuta, 10...
...Cam, 11...Cam shaft, W...Weft.

Claims (1)

[Scope of Claims] 1. Between the weft gripping device 3 and the main nozzle 7 installed on the sled, a weft controller 6 that is movable back and forth is sent out to the left and right positions between the weft gripping device and the thread guide on the exit side thereof. The weft controller is operatively connected to a cam 10 which rotates in synchronization with the main shaft of the loom via an intermediate link mechanism, and the above-mentioned cam shape is set so as to be able to engage with the weft when cutting the weft and when the main nozzle is in contact with the weft. When heading to the position (A) corresponding to the start of the movement, move the foot controller to the backward position accordingly,
A weft insertion auxiliary device for a fluid injection type loom, characterized in that, when the main nozzle moves toward a position (D) corresponding to weft beating, the weft controller is moved forward accordingly.