JPS6357534B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a weft inserting device for an air jet loom;
In particular, the concave portions formed in the reed blades are connected in the weft insertion direction to form a groove-like weft insertion passage, and air is injected toward the passage from auxiliary nozzles arranged at predetermined intervals in the weft insertion direction to insert the weft. This invention relates to a weft insertion device.

This type of weft inserting device is well known from Japanese Patent Publication No. 51-6787, etc., but for example, as shown in Fig. 1, it is formed on the reed blade 51 so as to surround the weft inserting passage (shuttle) on three sides. Upper protruding piece 53 of recess 52
The reed is in the process of retreating, and the warp threads 5 are forming an opening.
4, enters the opening from above in preparation for weft insertion, and exits from the warp opening when the reed moves forward after weft insertion. In areas such as the ends where the warp threads run diagonally due to the phenomenon of weaving shrinkage, there is a problem in that the warp threads 54 are strained and damaged by the projections 53 when entering and exiting.

The present invention has been made in view of these conventional problems, and aims to solve the above problems by making at least the upper wall of the recess formed in the reed almost coincident with the maximum opening of the warp threads. It is an object.

The present invention will be explained below based on an embodiment shown in FIGS. 2 to 4.

In the figure, 1 is a thread sword shaft, 2 is a thread sword, and a cam roller 4 is attached to the tip of a pair of levers 3a and 3b, which are provided integrally with the thread sword shaft.
a and 4b are pivotally mounted. These cam rollers 4a, 4b are in contact with a pair of cams 6a, 6b, which are fixed to a rotating shaft 5 that rotates in synchronization with the main shaft of the loom, respectively, so that the thread sword 2 can swing. It's getting old. A reed holder 7 is provided at the upper end of the thread sword 2, and a lower frame of a reed 8 is fixed to this reed holder 7 with wedges 9 and bolts 10. 11 is warp, 12 is woven fabric,
13 is a woven fabric, 14 is a main nozzle, and 15 is a weft.

The reed feathers 20 of the reed 8 have a reed batting wall 21a on the woven front 12 side, and a reed batting wall 21a on the upper side that almost coincides with the warp 11 at the maximum opening (more specifically, it is slightly outside of the warp 11 and slopes along this). ) The upper wall 21b and the lower wall 21c, which is substantially parallel to the upper wall 21b on the lower side, form a recess 21 that surrounds the shed on three sides. 21e is a protruding piece for forming the upper wall 21b. The recesses 21 of the reed feathers 20 are connected in the weft insertion direction to form a groove-shaped weft insertion passage 22.

On the other hand, blocks 30 are provided on the cloth facing 12 side of the reed holder 7 at predetermined intervals in the weft insertion direction, and auxiliary nozzles 31 are attached to each block 30 so as to pass through them substantially in the vertical direction. Each auxiliary nozzle 30 has an air guide pipe 32 connected to its lower end, and a corner 21d (actually Air is ejected diagonally to the weft insertion direction,
Further, this injection is carried out one after another to the next auxiliary nozzle 31 in synchronization with the progress of the tip of the weft yarn 15 during weft insertion.

To explain the operation, the reed 8 retreats and the warp 11 also opens to the maximum near its most retracted position, but at this time the upper wall 21b of the recess 21 of the reed feather 20 almost touches the upper warp 11 and the fourth The state shown by the solid line in the figure is reached. This state continues almost throughout the weft insertion period due to the profiles of the cams 6a and 6b.

During this time, the weft yarn 15 is blown into the weft insertion passage 22 by air jet from the main nozzle 14, and the weft yarn 15 is blown into the weft insertion passage 22.
When the tip of the weft 15 approaches the vicinity of the auxiliary nozzle 31, air is ejected from the auxiliary nozzle 31 to sequentially blow away the tip of the weft yarn 15 to perform weft insertion. In other words, this ejected air advances toward the row of corner portions 21d of the reed blades located on the opposite side of the weft insertion side from the auxiliary nozzle,
A part of it passes through the warp rows and reed rows and escapes, and ascends to the escape airflow, stabilizing the shed in the vicinity of the corner 21d, while the rest is oriented in the anti-weft insertion direction to the weft tip. It sends out the message.

Next, in the weft beating stroke, the reed 8 moves forward, and on the other hand, the warp opening amount decreases until the state shown by the chain line in Fig. 4 is reached, and the reed is struck, and then the reed moves back to the state shown by the solid line in Fig. 4. Return.

As is clear from the above description, according to this embodiment, the protrusions 21e are always located outside the 11 rows of warp threads and do not interfere with each other, so that the above-mentioned conventional problems can be solved. Furthermore, the embodiment utilizes the acute corner 21d inevitably formed by sloping the upper wall 21b as described above, and blows air toward this. As a result of the escape airflow and the airflow directed in the anti-weft insertion direction being concentrated near this corner 21d, the upper wall 21
Even if there are warp yarns on the lower side of b, the airflow is not disturbed much, and a stable weft insertion property can be ensured.Furthermore, since the ejected air is concentrated upward, the airflow is not disturbed. The length of the wall 21c and, therefore, the length of the protruding piece 21f for forming the wall 21c can be shortened, thereby reducing the amount of straining on the lower warp threads.

Further, in the present invention, by forming the upper wall 21b along the warp at the time of maximum opening, the upper wall 21b
Even if b is arranged slightly inside the warp, the degree of interference with the warp, that is, the amount of sliding contact, can be greatly reduced compared to conventional warps, so it is possible to suppress the occurrence of flaws due to the above-mentioned twisting. In this case, since the warp threads are not present in the recess 21, the jet airflow is no longer disturbed.

For example, when weaving using a large number of heddles, that is, when the maximum opening amount of each warp thread is slightly different within one cycle of the textile structure, the upper wall 21b may be moved slightly outward from the innermost warp thread. In addition, if the outermost warp threads are positioned slightly inward, these warp threads can be placed on the upper wall 2 as a whole.
1b.

As explained above, the present invention avoids unnecessary interference between warp threads running diagonally near the weaving edge and reed feathers, so it prevents warp thread breakage, increases the operating rate of the loom, or suppresses fuzzing. It can improve the quality of woven fabric.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing a conventional example, Fig. 2 is a side view showing an embodiment of the present invention, Fig. 3 is a perspective view of the main part of the same, and Fig. 4 is an enlarged side view of the main part of the same. . 8... Reed, 11... Warp, 15... Weft, 20
... Reed feather, 21 ... Recess, 21a ... Reed wall, 2
1b...upper wall, 21c...lower wall, 22...weft insertion passage, 31...auxiliary nozzle.

Claims (1)

[Scope of Claims] 1. Concave portions 21 formed in the reed feathers 20 are connected in the weft insertion direction to form a groove-shaped weft insertion passage 22, and auxiliaries are arranged toward the passage 22 at predetermined intervals in the weft insertion direction. In an air injection type weft insertion device for a loom, in which the weft 15 is inserted by injecting air from a nozzle 31, at least the upper wall 21b of the recess 21 is substantially aligned with the warp 11 when the warp 11 is at its maximum opening. Weft inserting device for air injection looms. 2. Claim 1, characterized in that air is injected from the auxiliary nozzle 31 toward the corner 21d formed by the upper wall 21b and the reed wall 21a.
A weft inserting device for an air-injection loom as described in 2.