JPS6335853A - Metal shuttle of air jet type loom - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Technical field of invention] The present invention relates to improvements in the synthesis of air-jet looms.

[Technical Background of the Invention and Problems Therewith] An air-jet loom uses a jet of air to blow the weft yarns and transport them between the warp yarns, and the reed is usually made of metal. In this synthesis, there are two types: one in which an air guide for guiding the weft threads is provided separately on the front side of the reed, and the other in which the air guide is provided in the reed itself, with the reed blades having jaws that protrude toward the front side. Are known. The present invention relates to the latter, an improvement in the synthesis of an air injection loom in which the reed itself is provided with an air guide.

Generally, during weaving, a force is applied to draw the warp threads together by driving the weft threads, and the width of the woven fabric becomes narrower than the spacing between the outer warp threads before the weft thread driving.

As mentioned above, in a loom that uses a composite structure made up of integrated reed blades with jaws that protrude toward the front side of the fabric, the warp threads may be cut or damaged at the jaws of the reed blades due to the impact when driving the weft threads. may occur. Cutting and damage to the weft threads due to collision with the jaws is most significant at both side edges of the woven fabric, but can also occur at the middle of the woven fabric in the width direction.

Furthermore, since the reed blades having jaws have a complicated shape as described above, there is also the drawback that the reeds are expensive.

[Object of the Invention] The present invention has been made based on the above-mentioned circumstances, and provides a reed which is free from the risk of cutting damage to the weft threads and which can be supplied at a low price.

[Summary of the Invention] The present invention is based on the finding that good weft driving is achieved even if not all of the fletchers are provided with jaws forming air guides.

In other words, the air injection loom of the present invention has a first fletching blade that is provided with a pair of jaws that form an air guide and has a taper inclined toward the upstream side of the air flow between the jaws; It is characterized in that it has a flat shape and is laminated with a second fletching having a taper similar to the taper in a portion corresponding to the space between the jaws.

[Embodiments of the Invention] Fig. 1A is a plan view of the first arrow feather used in the reed of the present invention, Fig. 1B is a cross-sectional view thereof taken along the line I-1, and Fig. 2A is a plan view of the first arrow feather used in the reed of the present invention. The plan view of the blade, FIG. 2B, is a cross-sectional view taken along the line ■-■. In FIG. 1A, the fletching 1 is of the same shape as that used for normal merging, and has two upper and lower jaws 2, 3 forming air guides. Note that, as shown in FIG. 1B, a taper 4 is provided between the lower jaws 2 and 3, which widens toward the upstream side of the air flow. Further, in FIG. 2A, the second fletching feather 5 has a flat shape with no jaws at all. Furthermore, as shown in FIG. 2B, a taper 6 inclined toward the upstream side of the airflow is provided at a portion corresponding to the space between the jaws of the first fletching 1.

The confluence of the present invention is constructed as shown in FIGS. 3A and 3B. That is, the first fletching 1 and the second fletching 5 are alternately stacked so that the second fletching 5 is located on both sides of the confluence, and the upper and lower ends of the stack are connected to the side members 7 and 8. to form a reed.

In the metal layer of the present invention having the above structure, each metal layer has a jaw,
Since the fletchers are arranged in a row, the impact on the warp due to weft driving is alleviated, and warp threads are not damaged or cut.

In addition, flat fletching feathers, which are easy to manufacture and low in cost, are also used, so they can be supplied at low cost.

Furthermore, between the jaws 2.3 of the fletching 1 with jaws, and the fletching 5 without 1.
Since tapers 4 and 6, which open toward the upstream side of the airflow, are provided at positions corresponding to the space between the jaws, the resistance to the airflow is reduced. Therefore, the pressure of the air flow increases and its turbulence is prevented, and weft threads can be driven smoothly without providing an air guide over the entire width of the confluence.

The increase in the pressure of the air flow due to the taper 4.6 described above will be explained using pressure measurement results at measurement points distributed in the longitudinal direction of the tapered reed and the non-tapered reed. That is, similar to the confluence of the present invention, fletchers with jaws and fletchers without one are alternately laminated, and there are two types: one without a taper between the jaws and the corresponding area, and the other with a taper. Figures 4A and B show the results of comparing the pressure distribution of both air passages under the same conditions.
It is as follows. In addition, in the case of both A and B in FIG. 4, a jet with a wind pressure of 3 kg/c/ is injected from one end of the reed.

These figures show that the average pressure in the width direction of the confluence is 28011111 because the confluence of the present invention is tapered.
It can be seen that the average pressure in the width direction is only 224 mmAq in the case where the taper is not applied.

Note that the present invention is not limited to the above embodiments.

For example, instead of alternately stacking barbed fletches and flat fletches, barbed fletches and a plurality of flat fletches may be alternately laminated. In this case, the cost can naturally be reduced even more than in the embodiments described above.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1A is a plan view of the first arrow feather used in the present invention, FIG. 1B is a sectional view taken along line I-I, and FIG. The plan view of the fletching, Figure 2B is its ■-
■A cross-sectional view of cotton; FIG. 3A is a side view of one embodiment of the present invention; FIG. 3B is a cross-sectional view taken along the line ■-■; FIG. 4A
1B is a graph showing the results of an experiment conducted to explain the effects of the present invention. 1.5 Arrow feathers 2,3 Jaws 4.6 Loop bar 7.8 Both side members Fig. 1 Fig. 2
Diagram A

Claims (1)

[Claims] a first reed blade comprising a pair of jaws forming an air guide and having a taper inclined toward the upstream side of the air flow between the jaws;
A metal reed for an air injection loom, characterized in that it has no jaws, has a flat shape, and is laminated with a second reed blade having a taper similar to the taper at a portion corresponding to the space between the jaws. .