JPH0468Y2 - - Google Patents

Description

[Detailed Description of the Invention] Purpose of the Invention (Field of Industrial Application) This invention relates to a weft storage device for a shuttleless loom, which is provided with a weft attachment and storage surface for adhering and storing the weft ejected from a storage nozzle.

(Prior Art) In shuttleless looms that perform weft insertion by jetting fluid, it is necessary to measure and store a predetermined length of weft supplied from a weft supply source each time weft insertion is performed. As this type of device, for example, JP-A-57-
There is one disclosed in Publication No. 95349. The above-mentioned device continuously measures the length of the weft yarn supplied from the cheese using a length measuring roller mechanism, and then sprays this weft yarn with a storage nozzle onto the weft attachment storage surface of an endless running belt to adhere and store the weft yarn. ing. Then, the weft yarn is introduced from the storage surface through the guide post to the gripper and main nozzle, and in synchronization with the weft insertion timing, the gripper is released and the main nozzle is activated, and the weft yarn on the storage surface is pulled out by a predetermined amount. , the gripper closes, the main nozzle stops operating, and one weft insertion is completed.

(Problem to be solved by the invention) However, in this type of weft insertion, the weft yarns attached and stored on the weft attachment storage surface continue to move in the drawing direction due to inertia even immediately after weft insertion. However, the weft becomes loose between the storage surface and the closed gripper, and when the gripper is opened during the next weft insertion, the weft yarn may come off the gripper and cause a weft insertion error.

Structure of the invention (means to solve the problem) In order to solve the above problems, this invention
A weft posture holding means is provided between the weft storage surface and the gripper for pulling the weft yarn in a direction opposite to the drawing direction and maintaining the weft passing posture through the gripper at the start of weft insertion.

(Function) By adopting the above-mentioned means, this device applies a tensile force in the direction of the storage surface to the weft that tries to move in the pulling direction due to inertia between the storage surface and the gripper after weft insertion is completed. . Therefore, the weft yarn does not loosen between the storage surface and the gripper, and is stably held after passing through the gripper at the start of weft insertion.

(Example) A first example of this invention will be described in detail below with reference to FIG.

The weft yarn Y supplied from the cheese 1 passes through a yarn guide 2, is continuously measured in length by a length measuring roller mechanism 3, and is guided to a weft storage device 4. The length measuring roller mechanism 3 includes a driving roller 5 that is continuously driven in synchronization with the rotation of the machine, a driven roller 6 that is driven in pressure contact with the roller 5, and a guide rod 7 that has a guide groove 7a. The weft yarn Y is wound around the driven roller 6 and the guide groove 7a, and as the driven roller 6 rotates, the weft yarn Y is continuously pulled out from the cheese 1 at a constant speed, and the weft yarn Y is drawn out continuously from the cheese 1 at a constant speed, and is pulled out from the weft yarn storage device 4 side. It is becoming more and more common to be sent to.

To explain the weft storage device 4 in detail, a support frame 8, which is vertically fixed to a fixed part such as a side frame of a loom, has a drive unit which is rotatably driven at a predetermined speed by a drive device (not shown) on the front surface (weft insertion side). A roller 9 and a driven roller 10 are arranged horizontally at a predetermined interval. An endless belt 11 is wound around both rollers 9 and 10, and a moquette 12 is laid on the outer surface of the belt 11 to form a weft adhesion storage surface 13. The drive roller 9 is configured to rotate clockwise, and the belt 11 is configured to run in the direction of arrow A on the upper side.

A storage nozzle 14 is supported through the support frame 8 above the drive roller 9 in the direction of the drive roller 9, and its tip is bent downward and directed toward the weft adhesion storage surface 13 on the drive roller 9. There is. The weft Y sent out from the length measuring roller mechanism 3 is introduced into the storage nozzle 14, and is continuously ejected onto the weft adhesion storage surface 13.

In front of the weft storage device 4, there is a reverse jet nozzle 15,
A gripper 16 and a main nozzle 17 for weft insertion are provided. During weft insertion, the weft yarn Y ejected from the storage nozzle 14 is conveyed on the weft storage surface 13 and then transferred to the reverse jet nozzle 15 and the gripper 16. Weft insertion is performed by the jet from the main nozzle 17 for weft insertion. Reverse jet nozzle 1
5 is operated between the end of weft insertion and the start of the next weft insertion, and the gripper 16 and main nozzle 1
7 are opened and closed and operated in synchronization with the weft insertion timing.

Now, the operation of the weft storage device configured as described above will be explained below.

The weft Y ejected from the storage nozzle 14 at a predetermined speed is sprayed onto the weft adhesion storage surface 13 on the drive roller 9, and is adhered to the weft adhesion storage surface 13 in a coil shape as the belt 11 runs. The weft yarn Y thus attached is transferred to the driven roller 10 side as the belt 11 runs, and is adhered and stored on the weft attachment storage surface 13 until just before weft insertion starts.

When the gripper 16 is opened in synchronization with the weft insertion timing and the main nozzle 17 is operated, the weft Y adhered and stored on the weft adhesion storage surface 13 is pulled out from the driven roller 10 side.
After weft insertion is completed, the gripper 16 is closed, the main nozzle 17 is also stopped, and the reverse jet nozzle 15 is activated. Weft yarn Y adhered and accumulated on the weft attachment accumulation surface 13 during weft insertion
Even after the weft insertion is completed, the weft continues to move due to inertia and tries to move in the drawing direction, but the reverse jet nozzle 15 jets the weft toward the weft attachment storage surface 13 and prevents the weft from moving. Therefore, the weft yarn Y does not become loose between the weft attachment storage surface 13 and the gripper 16 and come off from the gripper 16. In addition,
Since the airflow ejected from the reverse ejection nozzle 15 is weak enough to pull the slack weft yarn, it may be configured to be ejected at all times, including during weft insertion.

Next, a second embodiment of this invention will be described with reference to FIG.

In this embodiment, a pair of clamping rollers 18 are disposed opposite to each other between the weft attachment storage surface 13 and the gripper 16 as weft posture holding means, and a hook-shaped tension sensor 19 made of a lightweight material is installed behind the gripper 16 for the weft yarn Y. It was hung on. The nipping sensors 18 are configured to be separated during weft insertion, and when the tension sensor 19 detects slack in the weft yarn Y during non-weft insertion, the nipping rollers 18 are brought into contact with each other by a drive mechanism (not shown). rotate counterclockwise while holding the weft Y,
The structure is such that the weft yarn Y is pulled in the direction of the weft attachment storage surface 13. Even with this configuration, the effect is not different from that of the first embodiment.

Note that the operation of the nipping roller 18 in this embodiment may be controlled by the opening/closing operation of the gripper 16. Furthermore, it is also possible to attach a moquette to the opposing surface of the nipping roller 18. Note that when the moquettes are attached to the nipping roller 18, the weft yarn Y is pulled out by the ejection from the main nozzle 17 while being held between the flexible moquettes.
It is possible to omit the mechanism for connecting both the holding rollers 18.

Effects of the invention As detailed above, this invention provides a weft posture holding means between the weft storage surface and the grippers that pulls the weft in a direction opposite to the weft pulling direction, thereby creating a gap between the weft storage surface and the grippers. At the start of weft insertion, the weft yarn is always held in a gripper passing position, which provides an excellent effect of preventing weft insertion errors.

[Brief explanation of drawings]

FIG. 1 is a schematic perspective view showing a first embodiment of this invention, and FIG. 2 is a schematic perspective view showing a second embodiment. Weft attachment storage surface...13, storage nozzle...1
4. Reverse jet nozzle as weft posture holding means...
15, Gritspa...16, Main nozzle...1
7. Weft...Y.

Claims (1)

[Claims for Utility Model Registration] 1. A weft yarn ejected from a storage nozzle is attached and stored, and has a weft storage surface that moves relative to the storage nozzle, and furthermore, the weft yarn stored on the weft storage surface is In a weft storage device equipped with a main nozzle that performs weft insertion by pulling out through a gripper, the weft is pulled in a direction opposite to the pulling direction between the weft storage surface and the gripper,
A weft storage device for a shuttleless loom, which is provided with a weft posture holding means for maintaining the weft passing posture through a gripper at the start of weft insertion. 2. The weft storage device for a shuttleless loom according to claim 1, wherein the weft posture holding means is a reverse jet nozzle that jets fluid in a direction opposite to the main nozzle. 3. The weft storage device for a shuttleless loom according to claim 1, wherein the weft posture holding means is a pair of clamping rollers that clamp the weft and pull it toward the weft storage surface.