JPS5953931B2 - Warp pile yarn loosening prevention device - Google Patents

Description

Detailed Description of the Invention The present invention relates to a warp pile yarn loosening prevention device, and in particular, when weaving warp pile fabrics such as towels, pile warp yarns due to the difference in pile length near the selvage and other areas are used. This invention relates to a device for preventing pile warp yarns from becoming loose due to differences in consumption.

When weaving warp pile fabrics, the pile warp and ground warp are wound on separate beams to reduce the tension on the pile warp.

Then, the pile is woven by tension difference, weft stroke, texture, etc.

In other words, if you weave three or several weft yarns a little away from the front of the weave (loose pick), then beat the weft all the way to the front of the weave (fast pick), and simultaneously insert the previous several weft threads all the way to the front of the weave, Only the pile warp yarns are sent out, and loops appear on the fabric surface.

The number of times the fast pick is performed for each weft pick varies depending on the product, but currently in the industry, one fast pick is performed for every three piles, that is, three weft picks.
Since this is the mainstream, this will be explained below as a representative example.

However, it goes without saying that the following description and this invention also apply to the weaving of 4 to 6 pile fabrics.

In the case of 3-pile, first, the first and second wefts are loosely picked, and the third weft is fast-picked, so that the warp threads are sandwiched between the three weft threads 1st to 3rd. As a result, only the pile warp yarns with loose tension are squeezed and a loop appears on the fabric surface.

By the way, when the first weft is inserted from, for example, the right-hand shuttle box in a shuttled loom, the weft enters the shed from the turning point of the right ear section as shown in FIG. 1A.

When weft insertion is repeated one after another, a state as shown in FIG. 1B is obtained.

That is, the distance between the first weft and the second weft is larger at the right selvedge than at the center.

The pile warp is sandwiched between three wefts, that is, the first to third wefts, and is beaten through a handling opening to form a pile.

In other words, the pile warp threads are squeezed by the distance between the first and second weft threads, and a loop is formed from the point at which the first and second weft threads are tied together. The height of the loop is different, and the loop is lower in the right ear.

When the heights of the loops are different in this way, the amount of pile warp consumed is large in the center part and small in the right selvage part.

However, since the amount of pile warp fed out from the pile warp beam (per unit time) is constant in the weaving width direction, the pile warp becomes loose in the right selvage area where the amount of pile warp consumed is small, resulting in pile warp breakage. This is extremely inconvenient in terms of quality and efficiency control.

When the first weft is inserted from the left shuttle box, a similar problem occurs at the left selvedge.

In the case of shuttleless looms, such as rapier looms, the weft threads are likely to curve in the shed, causing a similar problem.

Figure 1 C shows this state. When the left rapier RP comes out of the cloth, the fast pick position is all the way, and the right selection finger F is also aligned with the fast pick position, so the first and second The weft threads are also curved, and as a result, the above-mentioned problems are likely to occur at both ends.

In order to prevent the above-mentioned disadvantages, the pile warp that loosens at the ears is wound up more than the pile warp at the center.

That is, there has been an attempt to locally increase the effective diameter of the winding roller by winding and pasting the part where the pile warp threads loosen, that is, sandpaper or the like.

However, with this method, the sandpaper must be replaced every time there is a change in the product weave width.

It is difficult in practice to perfectly set the relationship between the amount of slack in the pile warp yarns and the effective diameter, so it has drawbacks such as the fact that it is impossible to completely absorb the slack, so it cannot be said to be a perfect preventive measure.

Furthermore, in the case of the above-mentioned shuttleless loom, the warp is not passed through the portion where the first weft curves, but a selvage is formed on the outside thereof, and the selvage is cut off at this portion after weaving.

However, in this method, a large amount of weft end yarns are discarded along with the discarded ends, which is extremely disadvantageous in terms of material yield.

An object of the present invention is to provide a device for effectively preventing pile warp threads from loosening at the selvedges when weaving warp pile fabrics.

That is, the device of the present invention has a pair of pins erected at front and back positions that are slightly apart from each other on the outside of both edges of the fabric and approximately coincide with the loose pick line, so as to touch the front surface of the inserted weft yarn. The main points are as follows.

Furthermore, the gist of the present invention is to move the pair of pins as described above so as to coincide with the fast pick line as the reed moves during fast picking of the reed.

FIGS. 2A and 2H show one embodiment of the apparatus of the present invention.

That is, a pair of left and right pins 1 are located at front and back positions slightly spaced apart from each other on the outside of both ears of the cloth C and approximately corresponding to the loose pick line, that is, the line in the weft direction defined by the front surface of the reed R during loose picking. It is erected on a bracket 2 fixed to the frame FR so as to be in contact with the front surface of the inserted weft yarn W.

Here, when the pile length is changed, the construction state of the bracket 2 relative to the frame F can be adjusted in accordance with the change in the position of the reed R during loose picking. Of course.

Regarding the relationship with the rapier when pin 1 is fixed in this way, the distance between the weaving surface and the flow surface when the rapier is inserted into or pulled out from the shed is approximately 50 m.
It is about m.

Therefore, even if we estimate the maximum reed escape amount at loose pick to be about 16 mm, the distance between pin 1 and the flow surface is still about 34 mm.
Even if the maximum external diameter of the rapier is about 13 mm, this does not pose any problem in insertion.

Furthermore, if the pin 1 is of a fixed type, the weft W will be squeezed by the pin 1 as shown in FIG. 3 as the reed R moves forward during fast pick.

In general, such a situation does not pose a particular problem in practice, but if a weak yarn is used for the weft, there is a risk that the weft will break.

FIGS. 4A and 4H show other embodiments of the device of the present invention to prevent such disadvantages.

An arm 4 is supported by a bracket 3 fixed to the frame FR so as to be slidable in the front and back direction, and the above-mentioned pin 1 is attached vertically to one end of the arm 4, that is, the end facing the front surface of the reed R. It is fixedly supported.

Further, another pin 6 is similarly fixedly supported in a vertical manner at the other end.

A pin 7 is implanted on the upper surface of the bracket 3 in correspondence with this pin 6, and a tension spring 8 is interposed between both pins 6 and 7.

Furthermore, a push rod 9 is fixed to the upper surface of the reed R so as to protrude forward.

Now, in the structure described above, the settings of each part, especially the attachment of the push rod 9 and the bracket 3, are determined as follows.

That is, regardless of whether it is a loose pick or a fast pick, there is a predetermined interval between the surface of the reed R and the pin 1, that is, before and after the front of the reed coincides with the line in the weft direction defined by the front surface of the reed during each weft strike. It is determined that pin 1 is in the position.

More specifically, the press rod 9 is fixed to the top of the scoop so that the press rod 9 presses the pin 6 during fast pick and the distance between the reed R and the pin 1 becomes the above-mentioned predetermined value.

Next, move the frame FR so that the push rod 9 lightly touches the pin 6 during a loose pick when the maximum reed relief amount is set (the difference in reed position between fast pick and loose pick is called reed relief amount). Fix the bracket 3 to the

In the accompanying drawings, FIG. 4A shows the state at the time of loose pick when set in this way, and FIG. 4B shows the state at the time of fast pick.

With the above settings, the distance between the reed R and the pin 1 is always maintained at a predetermined value while the push rod 9 is in contact with the pin 6 and pushing it.

When the reed relief amount of the loose pick is set to a value less than the maximum reed relief amount, as the reed moves forward, the push rod 9 also moves forward, and from the moment it passes the position of the reed with the maximum reed relief amount, the push rod 9 moves to pin 6.
, pin 1 and reed R are kept at the specified distance.
Advance.

By the way, normally the setting is as above, but in order to make the push rod 9 and pin 6 touch lightly when loose picking is less than the maximum reed relief amount, the setting position of frame FR and bracket 3 should be adjusted each time. You can change it as described above.

Note that the above-mentioned maximum reed clearance amount is an amount determined by design.

As is clear from the above description, according to the present invention, the front and rear positions of the first weft of the loose pick after the fast pick are made constant in the shed over the entire weaving width, so that the curvature at the time of weft insertion is reduced. This prevents the pile height from being different between the center and selvedge areas of the fabric, and the amount of pile warp consumed becomes equal, eliminating slack in the pile warp at the selvage area and greatly reducing pile warp breakage. This greatly contributes to improving quality and efficiency.

[Brief explanation of the drawing]

FIGS. 1A and 1B are plan views showing the condition of weft yarns in the shed during loose picking in a conventional shuttle loom. FIG. 1C: A plan view showing the state of the weft inside the shed during loose picking in a conventional shuttleless loom. Figure 2A. B: Plane and side views showing one embodiment of the device of the present invention. FIG. 3; A plan view showing the state of the weft yarn during fast picking in the above device. FIGS. 4A and 4B: Side views showing the operating state of another embodiment of the device of the present invention. C...Cloth, 1...Pin, R...
・Reed, 2, 3...Bracket, FR...
・Frame, 4...Arm, W...Weft.

Claims (1)

[Claims] 1. A warp in which a pair of pins are erected on the outside of both edges of the fabric at a position that substantially coincides with the loose pick line and is positioned so as to correspond to the front surface of the inserted weft yarn. Pile loosening prevention device. 2 At a position slightly apart on the outside of both edges of the cloth, when the reed performs a loose pick, the position approximately coincides with the loose pick line, and when the reed performs a fast pick, the position approximately coincides with the fast pick line. A warp pile yarn loosening prevention device comprising a pair of pins which are operatively associated with a reed so as to be movable and are placed upright so as to touch the front surface of inserted weft yarns.