JP2001262447A - Tuck-in device for shuttleless loom - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tuck-in device for a shuttleless loom capable of producing non-defective goods having selvages trued up at both ends by changing a fluid jetting condition corresponding to changes of tensions of the selvages of a warp row. SOLUTION: In the tuck-in device 11 for a shuttleless loom for folding back the end of a weft yarn 7 in the opening of a warp yarn by a fluid jet from a tuck-in nozzle 19 arranged on the side of a warp yarn row 4, a warp yarn tension-detecting means 15 for detecting the tension of selvage parts 6 of the warp yarn row 4, a jetting condition-varying means 21 capable of changing jetting conditions of the fluid and a control means 20 for controlling the jetting condition-varying means 21 depending on detected results of the warp yarn tension-detecting means 15 are equipped.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tuck-in device for a shuttleless loom that uses a fluid jet to turn a weft end into a warp shed. More specifically, the present invention relates to a tuck-in device of a shuttleless loom that can change a fluid injection condition during operation.

[0002]

2. Description of the Related Art In a conventional shuttleless loom, the ejection conditions of a fluid from a tuck-in nozzle, for example, the ejection amount and the ejection direction are kept constant during operation, and usually, as shown in FIG. They were producing good quality products in a straight line. These injection conditions are determined according to different weaving conditions such as yarns to be used, based on experience and the results of trial weaving, assuming that the tension of the ears of the warp row during operation is constant. is there.

However, since the environment such as temperature and humidity and the degree of winding of the warp beam are not always constant, the tension at the ears of the warp row may change during operation. Even when the tension at the ear portion is weakened, the fluid jetting conditions are constant, so that the end of the weft is relatively strongly folded back against the tension, and the ear end is drawn to the fabric side. As shown in (1), defective products with uneven ear edges may be produced.

[0004]

SUMMARY OF THE INVENTION The present invention has been developed in consideration of the above-mentioned circumstances, and an object of the present invention is to change a jetting condition of a fluid in accordance with a change in tension of an ear portion of a warp row, and The object of the present invention is to provide a tuck-in device of a shuttleless loom capable of producing a good product having a uniform quality.

[0005]

According to a first aspect of the present invention, there is provided a tuck-in device for a shuttleless loom which folds an end of a weft into a warp opening by jetting a fluid from a tuck-in nozzle arranged on a side of a warp row. In the above, warp tension detecting means for detecting the tension of the ear portion of the warp row, injection condition changing means capable of changing the jetting condition of the fluid, and control for controlling the injection condition changing means based on the detection result of the warp tension detecting means Means.

[0006] The injection conditions include, for example, injection pressure, injection amount, injection period, injection start timing, injection end timing, injection direction, and the like, and these may be used alone or in combination. Injection condition variable means means all that can change the above-mentioned injection conditions, and as an example, a regulator for adjusting the fluid pressure fed to the tuck-in nozzle, a switching valve for determining the timing for sending the fluid to the tuck-in nozzle, a tuck-in nozzle And the like, in which a swing mechanism is provided in a body having a built-in body and the injection direction is changed by the swing. In addition, there are two ways of changing the injection conditions: a method of continuously changing the warp tension in response to a subtle change, and a method of changing the stepwise step in response to a large change in the warp tension.

[0007] The above-mentioned tack-in device may be disposed on at least one of the left and right sides of the warp row. When only one of them is arranged, one ear edge of the fabric is surely aligned, but the other ear edge may be uneven. Therefore, in order to align both ear ends, it is desirable that the above-described tack-in device is arranged on both the left and right sides of the warp row.

[0008] The warp tension detecting means may directly detect the warp tension as in the invention of claim 2, or the cloth width at the end of the fabric as in the invention of claim 3. The warp tension may be indirectly detected by detecting the movement in the direction on the downstream side of the weaving mouth.

As one example of the warp tension detecting means used in the second aspect of the present invention, a sensor rod wound around an ear portion,
A combination with a load cell that knows a change in load applied to the sensor rod can be given. The location of the warp tension detecting means may be within the range from the delivery beam to the weave on the warp path of the ear portion.

As an example of the warp tension detecting means used in the third aspect of the present invention, a combination of a light projector and a light detector for detecting the end of the fabric can be cited. In addition, even if the location of the warp tension detecting means is on the downstream side of the weaving opening, the length of the defective product produced becomes shorter as close to the weaving opening as possible. The downstream side of the weaving mouth is the upstream side of the cloth winding beam.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, an overall image of a shuttleless loom will be described with reference to FIG. 1 is a reed, 2 is a weft insertion nozzle, 3 is a heddle frame, 4 is a warp row, 5 is a warp row fabric portion, 6 is a warp row ear portion, 7 is a weft thread, 8 is a fabric, 9 is an ear, and 10 is a ear. Origuchi,
11 is a tack-in device of the present invention.

The tack-in device 11 is generally called a needleless stack-in device, and is disposed on each of the left and right sides of the warp row 4. Since the structure is basically the same on both sides, only one will be described. As shown in FIGS. 1 and 2, the first embodiment of the tuck-in device 11 has a body 12 that grips a weft end and folds a weft end outside the warp row 4, and a cutter outside the body 12. A warp tension detecting means 15 is provided in a range of the warp beam 14 and the heald frame 3 at the ear portion 6 of the warp row, and is inserted into the body 12 from the pressure fluid source 16 via the regulator 17 and the switching valve 18. The fluid is sent, the fluid is ejected from the tack-in nozzle 19 in the body 12, and the end of the weft is turned back. Also,
The regulator 17 and the switching valve 18 are operated based on a signal obtained from the warp tension detecting means 15 by a control means 20 using computer control, so that the fluid ejection conditions can be changed. Here, a combination of the regulator 17 and the switching valve 18 is referred to as an injection condition variable unit 21. Reference numeral 22 denotes a weft end gripping device that pulls in a weft end.

The warp tension detecting means 15 directly detects the total value of the tension obtained from each warp of the ear portion 6. Specifically, as shown in FIGS. 2 and 3, three rods 23, 24, and 25 are arranged at intervals from the upstream side to the downstream side of the ear portion 6, and the central rod 24 is used as a sensor rod. The rods 23 and 25 on both sides are fixed rods, and the support rods 26 provided outside the warp row 4 are fixed rods 23 and 25.
And the outer end of the sensor rod 24 is fixed to a load cell 27 attached to a support member 26, and the upper side of both fixed rods 23, 25 and the sensor rod 24 are fixed.
The ear part 6 is wrapped around the lower side. Although not shown, the support member 26 is fixed to the frame of the loom.

The control means 20 determines whether or not the tension of the ear portion 6 is a normal value based on the detection signal from the warp tension detecting means 15 and, based on the determination result, determines the opening / closing timing of the switching valve 18. This is for determining the fluid pressure obtained by the regulator 17 and outputting the determination signal to the injection condition changing means 21. Specifically, at least two types of injection conditions, namely, when the tension is equal to or higher than a specific value and when the tension is lower than the specific value, namely, when the switching valve 18 is opened and closed, and when the fluid pressure adjusted by the regulator 17 is two, It is set in advance one by one. Then, a detection signal from the load cell 27 is taken in, and it is determined whether the detection signal is equal to or greater than a specific value. If the detection signal is equal to or greater than the specific value, it is determined that the tension is a normal value. And the fluid pressure by the regulator 17 are selected. On the other hand, if it is less than the specific value, it is determined that the tension is lower than the normal value, and the opening / closing timing and the fluid pressure for less than the specific value are selected. Thereafter, a signal of the selected injection condition is output to the regulator 17 and the switching valve 18, and the regulator 17 sets the fluid pressure to a desired value and opens and closes the switching valve 18 at a desired timing.

As shown in FIGS. 4 and 5, a second embodiment of the tuck-in device 11 of the present invention is one in which the warp tension detecting means 15 indirectly detects the warp tension of the ear portion 6, specifically, It is characterized by using a light projector 28 and a light receiver 29. More specifically, the light emitter 28 and the light receiver 29 are disposed slightly downstream of the weaving opening 10 so as to face the upper and lower ends of the ear ends. Is set to be such that light is incident on the light receiver 29 when the end of the woven fabric is not aligned and reaches the fabric side because the ends of the fabric are not aligned and are not drawn to the light receiver 29.

In this way, if the ends of the fabric are aligned, no light enters the light receiver, and the low signal output from the light receiver 29 to the control means 20 allows the warp tension at the ear portion to be normal. Is detected, on the other hand, when the fabric edge is pulled toward the fabric side and becomes uneven,
, The Hi signal output from the light receiver 29 to the control means 20 detects that the warp tension of the ear portion 6 is weak. Therefore, based on the output signal obtained from the light receiver 29, the control means 20 controls the injection condition variable means 21 in the same manner as in the first embodiment.

The present invention is not limited to the above embodiment. For example, the control means 20 determines the tension of the ear portion 6 in three stages: a case where the tension is higher than the normal value, a case where the tension is normal, and a case where the tension is lower than the normal value. It may be one that selectively outputs. In addition, a limit value when the value is higher than the normal value and a limit value when the value is lower than the normal value are provided. When the tension of the ear portion 6 exceeds these limit values, the warp row of the ear portion is cut or immediately before cutting. The loom may be automatically stopped from the viewpoint of preventing the fabric defect (defective product) and the excessive air consumption from being judged that a trouble such as over-tension of the fabric has occurred, or a special alarm may be used. The worker may be alerted by sound or light emission. Further, in the case where the control means 20 is used in the first embodiment, the injection condition may be continuously changed in response to a subtle change in the tension of the ear portion 6.

[0018]

According to the first aspect of the present invention, the jetting condition of the fluid is changed on the basis of the detection result of the warp tension of the ear portion, so that when the weft end is folded back into the warp opening, the warp of the ear portion is made of cloth. It can be prevented from being drawn to the side, and as a result, a non-defective product having a uniform edge of the fabric can be produced.

According to the second aspect of the present invention, since the warp tension at the ear portion is directly detected, the change in the tension can be accurately and quickly known, and as a result, the control means can cope with the subtle change in the tension. To control the injection condition variable means,
The non-defective rate can be improved.

According to the third aspect of the present invention, since the warp tension detecting means detects the movement of the fabric end in the cloth width direction on the downstream side of the weaving shed, after the ear ends actually become irregular, the ear ends are detected. Alignment control can be started.

[Brief description of the drawings]

FIG. 1 is a schematic plan view showing a first embodiment of a tack-in device for a shuttleless loom of the present invention.

FIG. 2 is a side view showing a first embodiment of the tuck-in device of the shuttleless loom of the present invention.

FIG. 3 is a perspective view showing a main part of the first embodiment of the present invention.

FIG. 4 is a side view showing a second embodiment of the tack-in device of the shuttleless loom of the present invention.

FIG. 5 is a perspective view showing a main part of a second embodiment of the present invention.

FIGS. 6A and 6B are plan views showing main parts of non-defective products and defective products.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 4 Warp row 6 Ear part 7 Weft 10 Weaving mouth 11 Tuck-in device 15 Warp tension detecting means 19 Tuck-in nozzle 20 Control means 21 Injection condition variable means

Claims (3)

[Claims] 1. A weft thread (7) by jetting a fluid from a tack-in nozzle (19) disposed on the side of a warp row (4).
In a tuck-in device (11) of a shuttleless loom that folds the end of a thread into a warp shed, a warp tension detecting means (15) for detecting a tension of an ear portion (6) of a warp row (4), and a fluid ejection condition. It comprises a variable injection condition variable means (21), and a control means (20) for controlling the injection condition variable means (21) based on the detection result of the warp tension detecting means (15). Tuck-in device for shuttleless looms. 2. The tack-in device for a shuttleless loom according to claim 1, wherein the warp tension detecting means (15) directly detects the warp tension. 3. The warp tension detecting means (15) indirectly detects the warp tension by detecting the movement of the end of the fabric in the cloth width direction on the downstream side of the weaving opening (10). The tack-in device for a shuttleless loom according to claim 1, wherein: