JPH0453972B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Technical Field> The present invention relates to a device for preventing the occurrence of vertical streaks in a water jet loom during operation of the loom.

<Background technology> As shown in Fig. 1, a water jet loom has a heald 1
The weft threads 5 are inserted into the openings 3 of the warp threads 2 opened by the weaving machine with water jetted from the water jet nozzle 4, and then the weft threads 5 are beaten onto the fabric front 7 using a reed 6 to weave a woven fabric 8. be.

By the way, recent water injection looms have increased operating speeds, running at around 700 to 800 rpm.
As the speed has increased in this way, a problem has been encountered in that warp streaks occur and the quality of the fabric is significantly degraded.

Even when the same loom and the same fabric are used, such streaks do not occur at low speeds, or are not noticeable even if they occur, but they occur significantly at high speeds exceeding about 700 rpm.

As a result of various observations and studies, the inventor of the present invention has come to conjecture the mechanism of generation of transverse streaks as follows.

In other words, it was thought that the cause of warp streaks was that the warp tension was not uniform among the warp threads, and that the warp threads with low tension were pulled together in a certain direction for some reason. As a result of observation, it was found that there was a lot of water accumulated on the woven fabric near the front of the fabric, at the boundary between areas with less and more water, and in areas with less water, and based on this, we made a guess.

First, as the speed of the loom increases, the deflection of the reed 6 increases, and as shown in FIG. 2, a phenomenon occurs in which the reed feathers 9 are twisted during reed beating. It is thought that this twisting is determined by the unbalance of the warp tension, the unbalance of the sliding resistance with the warp, etc. Then, in the area where no streaks occur, the direction of the twist changes moderately,
This is thought to be due to the fact that the warp spacing C ₁ is not widened and the direction of the twist is in one direction in the portion where warp streaks occur, increasing the warp spacing C ₂ in that portion.

Next, let's look at the relationship between the twist of the reed feathers 9 and the boundary between areas where there is a lot of water and areas where there is little water accumulated on the fabric 8 near the fabric front 7, which is where streaks occur frequently, see Figure 3. First, in areas where there is a lot of water, the water accumulated on the woven fabric 8 exists between the warp threads 2 due to capillary action, and in areas where there is little water 10, this water is small or not present at all. I think that the. And the presence of water between these two warp threads,
It is thought that the warp streaks occur because the direction of twist of the reed feathers 9 is determined by their absence.

That is, referring to FIG. 3, the reed feathers 9 are subjected to resistance from the side where the water is present, and at the same time the reed 6 begins to bend, and this resistance causes the front edge of the reed feathers 9 to twist toward the side where there is no water. When this situation continues for a predetermined period of time, since the direction of twist of the reed feathers 9 is constant, the warp yarn density in that part decreases, resulting in a warp stripe. At this time, since the left and right resistance to the reed feathers 9 is the same in areas with and without water, the direction of twisting of the reed feathers 9 varies appropriately each time the reed is struck, and as a result, no streaks occur.

Secondly, it was speculated that the warp streaks occur because the sliding resistance between the warp and weft is not uniform.

That is, when the warp threads 2 and the weft threads 5 are woven (during beating), their tensions are balanced and stabilized to form the woven fabric 8. Therefore, when the weft threads 5 are pushed out toward the fabric front 7 by the reed feathers 9 and the warp threads 2 close at the beginning of the later retreat and then open at the opposite phase, the above-mentioned tension balancing action is performed. Therefore, when the operating speed of the loom exceeds about 700 rpm, when the tension between the weft threads 5 and the warp threads 2 is not balanced, the warp threads 2 begin to be opened in opposite phases, and the weft threads 5 and warp threads 2 are restrained. , it seems that menstrual streaks may occur.

This phenomenon will be explained with reference to FIG. 4. First, during reed beating, the reed feathers 9 are twisted and the intervals between the warp yarns 2 become irregular, as in the first guess. At this time, warp 2
is almost closed, and the degree of freedom of the weft thread 5 still exists. After this, as the reed 6 moves backward and the opposite phase shedding of the warp threads 2 progresses, the weft threads 5 are further bent by the tension of the warp threads 2, and the warp threads 2 are moved to the position due to the twist of the reed feathers 9 of the warp threads 2 (solid line). (shown) to the equilibrium position (shown by chain lines), but the return speed varies depending on the degree of frictional resistance between the warp threads 2 and weft threads 5, so if the frictional resistance is large, the warp threads 2 will return before they slip on the weft threads 5. It is thought that the opening of the warp threads 2 becomes larger and becomes stable in the middle of the process, and if this continues, warp streaks will occur.

Here, in the area where there is water on the woven fabric 9, water is present even in the warp threads 2 of the opening 3 as described above, so this water acts as a lubricant between the warp threads 2 and the weft threads 5. However, since there is no lubricating liquid in the areas where there is no water on the woven fabric 8, it is difficult to slip, and it is thought that warp streaks are likely to occur.

<Objective of the Invention> In view of the above-mentioned background, an object of the present invention is to prevent the occurrence of warp lines during the operation of a water jet loom due to the speeding up of the loom.

<Structure of the Invention> For this reason, the present invention provides a water injection device that injects water near the front of the fabric over the entire width of the woven fabric during operation of the loom, so that water almost uniformly adheres between all the warp yarns near the front of the fabric. In this way, the occurrence of menstrual streaks is prevented.

<Example> Examples will be described below.

A first embodiment is shown in FIGS. 5 and 6.
Incidentally, in this embodiment, the same parts as in the conventional example are given the same reference numerals, and the explanation will be omitted, and only the different parts will be explained.

A water supply pipe 11 serving as a water injection device is disposed above and parallel to the fabric front 7, and both ends thereof are supported by brackets 13A and 13B erected on left and right frames 12A and 12B of the loom. One end of this water supply pipe 11 is closed with a cap 14, and a pipe 15 from a water supply source is connected to the other end.
A predetermined interval, e.g. 20mm, in a range corresponding to the entire width of
Water inlets 16 are opened at intervals. Here, these water inlets 16 direct the injected water so that it reaches the fabric 8 near the fabric front 7 or the warp 2 section (section A in Fig. 6), and It is set so that water adheres to the gap (section B in Figure 6).
The area to be attached is approximately 2mm from Orimae 7 to the reed 6 side.
More than that is fine.

According to this configuration, since water adheres to the warp threads 2 near the woven fabric 7 over the entire width of the woven fabric 8, the resistance to the reed feathers 9 during reeding is approximately the same over the entire woven fabric, and the reed The feathers 9 are no longer twisted in one direction. In addition, this water acts as a lubricant, reducing the frictional resistance between the warp threads 2 and the weft threads 5 throughout the woven fabric, and allowing the weft threads 5 and warp threads 2 to slide quickly. Therefore, generation of menstrual streaks can be prevented.

FIG. 7 shows a second embodiment.

In this embodiment, a guide is provided as a water injection device to guide weft inserting water that scatters from the reed during reed beating to the vicinity of the weaving area.

Reference numeral 20 denotes a guide plate, which is rotatably attached to a support rod 21 disposed above the woven fabric 7 with both ends supported by a frame, and is allowed to hang down due to its own weight, and its lower end 22 is attached to the woven fabric 7. It is placed close to. Of course, the width of this guide plate 20 is made wider than the width of the woven fabric 8.

Therefore, when weft insertion water adhering to the reed 6 is scattered toward the guide plate 20 when the reed is struck by the swinging of the reed 6, it hits the guide plate 20 and flows down along the guide plate 20. Water is injected from the lower end 22 onto the woven fabric 8 in the vicinity of the woven fabric 7, and due to the adhesion of this water, it is possible to prevent the generation of warp lines, as in the first embodiment. In this case, as the water to be injected,
It is economical because it uses weft water. In addition, when operating the weaving cloth, if the guide plate 20 is rotated around the support rod 21, the workability will not be impaired.

In addition, by combining the first embodiment and the second embodiment, water from the water supply pipe is injected into the vicinity of the weaving area, and at the same time, weft insertion water is collected by a guide plate and injected into the vicinity. It's okay. Alternatively, water from the water supply pipe may be applied to the guide plate and all of the water may be poured from the lower end of the guide plate.

<Effects of the Invention> As explained above, according to the present invention, water is maintained almost uniformly between the warp threads near the woven fabric, so there is no bias in the way external force is applied to the reed feathers during reed beating. The twist does not continue in one direction, and the presence of water, which acts as a lubricant between the weft and warp, improves the slippage between the weft and warp, which eliminates the occurrence of warp streaks. It will be done.

[Brief explanation of the drawing]

Figure 1 is a perspective view of a conventional water jet loom;
Figures 2, 3, and 4 are enlarged views of the area near the front of the woven fabric to explain the causes of streaks, and Figure 5 is a water jet type showing the first embodiment of the present invention. A perspective view of the loom, FIG. 6 is a side view of the same as above, and FIG. 7 is a second loom.
FIG. 2...warp, 4...water jet nozzle, 5...weft, 6...
Reed, 7... Orimae, 8... Woven fabric, 11... Water supply pipe, 1
6...Water inlet, 20...Guide plate.

Claims (1)

[Claims] 1 In a water injection loom that inserts the weft yarn 5 with water injection from the water injection nozzle 4, water injection devices 11, 20 inject water into the vicinity of the fabric front 7 over the entire width of the woven fabric 8 during operation of the loom. A warp line prevention device for a water jet loom, characterized by comprising: