JPH042700B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a shuttleless machine, and more particularly, the present invention relates to a shuttleless machine, and in particular, a machine in which weft threads are continuously drawn out from a weft supply source by a length measuring device and are stored for a predetermined length on a pool surface by an air flow from a pool nozzle. This invention relates to a weft storage device.

Prior Art An example of a shuttleless loom equipped with such a weft storage device,
That is, the air jet room is shown in FIG.

In FIG. 1, a weft Y drawn out from a bobbin 5, which is a weft supply source, passes through a tensioning device 4,
The yarn then reaches a length measuring device, in which the yarn first comes into contact with a separator 1, then is wound around a length measuring roller 2, and after being wound several times between the two, the weft yarn is brought into contact with the separator 1. The air is delivered to a storage air injection nozzle, ie, a pool nozzle 3. As the length measuring roller 2 is continuously rotated by the drive drum 10, the weft yarn Y is jetted from the pool nozzle 3 and stored in a loop shape on the pool surface of the weft storage device 6. Then, during the weft insertion movement, the weft yarn holding device 7 By being released, the stored weft passes through the guide 8 and is discharged into the warp opening at once by the action of the weft insertion nozzle 9, and is continuously sent out from the length measuring roller 2, so that the weft tip ends in the warp opening. When the yarn has passed through the weft yarn holding device 7, the yarn is held by the weft yarn holding device 7, so that the weft yarn storage starts again.

In recent years, the speed of such shuttleless machines has been further increased, and as a result, the flying speed of the weft yarn has also increased. Therefore, the need to promptly send a predetermined length of weft stored in the weft storage device 6 to the warp opening side has increased.
As a factor that obstructs this request, the weft storage device 6
There was resistance to pulling out the weft from the pool surface 6a.

Particularly in the air jet room, the greater the resistance, the more it is necessary to increase the set air pressure in the weft thread insertion nozzle 9. This not only increases air consumption, that is, energy cost, but also increases the weft thread strength due to the high-speed air flow. When yarn breakage occurs in the weft insertion nozzle or other locations due to straining and untwisting, or when the amount of pooled yarn becomes zero (in the weft storage device described above, the stored weft is first discharged at once, and then the length is measured) Since the weft threads that are continuously supplied from the device are discharged without being pooled, troubles such as thread breakage due to the impact applied to the weft threads (sometimes the amount of pooling is zero) often occur.

On the other hand, the air flow injected from the pool nozzle 3 causes problems such as when the measured weft between the length measuring device and the pool nozzle 3 becomes slack and wraps around the length measuring roller 2. It is necessary to apply a driving force to the weft to the extent that it does not slacken. However, more propulsive force is generated by the pool surface 6 of the weft storage device 6.
The pool surface of the weft storage device 6 merely serves to unnecessarily stretch the weft yarn in the longitudinal direction on the surface a of the weft yarn storage device 6 and to apply a tensile force to the weft yarn in a direction that resists the force for pulling out the weft yarn from the weft storage device 6. This increased the resistance to pulling out the weft yarn from 6a.

OBJECTS OF THE INVENTION Therefore, an object of the present invention is to provide a weft storage device for a shuttleless loom that enables trouble-free high-speed operation by reducing the pull-out resistance of the weft from the pool surface of the weft storage device. It is to be.

Composition of the Invention In order to achieve the above object, the present invention provides a shuttleless loom in which a length measuring device continuously draws out weft from a weft supply source and stores the weft in a predetermined amount on a pool surface by an air flow from a pool nozzle. The weft storage device is characterized in that the axis of the pool nozzle is substantially on the same level as the pool surface, and the edge of the pool surface on the pool nozzle side is curved or inclined in a direction away from the weft. It is something to do.

Due to this feature, the air jet from the pool nozzle gives the weft enough propulsion to prevent the weft from sagging.
The pool surface is divided into two at the curved part, and only a portion of the air jet flows along the pool surface, and the weft is pooled while decelerating due to resistance on the pool surface, so that no excessive tensile force is applied to the weft. , the resistance to pulling out the weft from the pool surface is reduced.

Embodiment 1 Next, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings, in which the same reference numerals as those used in FIG. 1 indicate the same or corresponding parts. A detailed explanation thereof will be omitted.

2 and 3, the weft storage device 6 according to the present invention has a flat plate portion 6' having a pool surface 6a.
, an attachment part 6'' to which the pool nozzle 3 is attached by appropriate means, and an inclined part 6 that connects the flat plate part and the attachment part. In between, when the pool nozzle 3 is attached to the attachment part 6'', the axis of the pool nozzle 3 is aligned with the pool surface 6a.
There is a step so that it is on almost the same plane as the The inclined portion 6 from the edge of the pool surface 6a on the pool nozzle 3 side is inclined downward at a predetermined angle selected in consideration of various conditions. Due to the existence of this slope, a predetermined distance L is maintained between the edge of the pool surface 6a and the tip of the pool nozzle, so that a part of the air jet from the pool nozzle 3 is placed above the pool surface. The remaining part hits the slope part 6 conveniently.
It is suitably diffused along the In addition, the inclined portion 6
An appropriate number of through holes (not shown) are provided at appropriate locations.
It is preferable to provide a slanted portion 6 so that a part of the airflow flowing along the sloped portion 6 can escape.

Next, the operation of this embodiment 1 will be explained, but the operation of the operating part of the loom for pooling the weft onto the pool surface, releasing the weft from the pool surface, inserting the weft, etc. is the same as that of the conventional one. You can think about it, so I will omit the explanation.

According to the present invention, the airflow injected from the pool nozzle 3 applies the driving force necessary for the weft to move to the pool surface 6a without being wrapped around the length measuring roller 2, and then the airflow is applied to the flat plate portion 6'. It reaches near the boundary with the slope part 6. The axis of the pool nozzle 3 is the pool surface 6a
, the air flow is dispersed at the boundary, the upper half of which flows along the flat plate part 6', the lower half of which flows along the inclined part 6, and the air flow is dispersed at the boundary. The airflow along the pool is decelerated by the frictional resistance of the pool surface 6a. Therefore, since the air flow from the pool nozzle 3 that pulls out the weft yarn from the length measuring roller 2 does not apply excessive propulsion to the weft yarn, the pool surface 6
The resistance to pull out the weft yarn from a is reduced. According to an example of an air jet room, since the weft drawing resistance was reduced, the air pressure used in the weft thread insertion nozzle 9 could be reduced by 0.1 to 0.2 kg/cm ² .
This value is quite significant for weaving machines operating under critical conditions.

Embodiment 2 FIG. 4 shows another embodiment, and is a diagram corresponding to FIG. The difference from the first embodiment is that the inclined part 6 is a vertical part, and the boundary between the vertical part and the flat plate part 6' is a curved part 6b with a relatively large curvature.
This is what is happening. The airflow from the pool nozzle 3 operates in much the same way as in the embodiment of FIG.

Embodiment 3 FIG. 5 shows yet another embodiment, and this Embodiment 3 differs from Embodiment 2 in that a pool pipe having a morning glory-shaped opening end is used as the weft storage device.
It's different. The effect is the same as in Examples 1 and 2.

Effects of the Invention As described above, according to the present invention, the axis of the pool nozzle is substantially on the same plane as the pool surface of the weft storage device, and the edge of the pool surface on the pool nozzle side is separated from the weft. Since the pool nozzle is curved or sloped in the direction, the airflow from the pool nozzle is resisted when flowing along the pool surface, and is diffused at the curved or sloped portion, so that it does not impart an excessive driving force to the weft. Therefore, the resistance to pulling out the weft yarn from the pool surface is reduced, and trouble-free weft insertion is performed.

[Brief explanation of drawings]

FIG. 1 is a perspective view of the main part of a weft insertion device equipped with a conventional weft storage device, FIG. 2 is a side view, partially in section, of a first embodiment of the weft storage device according to the present invention, and FIG. Fig. 2 is a partially sectional plan view of the first embodiment, Fig. 4 is a side view of the second embodiment partially sectional, corresponding to Fig. 2, and Fig. 5 is the third embodiment. Side cross-sectional view. In the figure, 3 is a pool nozzle, 5 is a weft supply source, and 6 is a pool nozzle.
6 is a weft storage device, 6a is a pool surface, 6b is a curved portion, 6 is an inclined portion, and Y is a weft.

Claims (1)

[Claims] 1. In a weft storage device for a shuttleless loom, in which a weft thread continuously pulled out from a weft supply source by a length measuring device is stored for a predetermined length on a pool surface by an air flow from a pool nozzle, the axis of the pool nozzle is located on the pool surface. 1. A weft storage device for a shuttleless machine, wherein the pool surface is substantially on the same plane as the pool surface, and an edge of the pool surface on the pool nozzle side is curved or inclined in a direction away from the weft.