JPH0634381Y2 - Weft catching device of yarn end processing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION << Industrial Application Field >> This invention relates to a weft catching device of a yarn end treating device, and more specifically, in a yarn end treating device provided on the non-feeding side of a jet loom. The present invention relates to a device for capturing the tip of a weft.

<< Prior Art and its Problems >> In order to improve the tightness of the selvage of the fabric in the jet loom, as shown in FIG. 4, a catch cord 1 is provided outside the cloth end to catch the tip of the weft W. Catch code 1
There are, for example, those that capture the weft yarn W by twisting it while rotating by the false twist spindle 3, and those that entangle and capture the weft yarn by the opening and closing movement of the heald.

By the way, in order to shorten the length of the throwing selvage (that is, the length of the yarn cut off by the cutter 5) and save the weft, it is necessary to set the distance L ₁ from the cloth fell to the catch cord 1 as small as possible. .

However, when the front end of the weft W is caught by the catch cord 1, the front end of the weft may be violent and folded back beyond the catch cord 1 due to entanglement, twisting, or other reasons. When the tip of the weft is folded back in this manner, it is woven into the cloth edge of the cloth, and a folding back defect occurs. In addition, accidents such as a dry stop are likely to occur.

In order to avoid such inconvenience (occurrence of folding back defects, etc.), it is necessary to increase the distance from the cloth fell to the catch cord 1. That is, if the distance from the cloth edge to the catch cord is L ₁ and the distance from the catch cord to the position where the tip of the weft can reach is L, it is necessary to set L ₁ ≧ L. Here, the length of the weft thread outside the catch cord 1 required to be entangled with the catch cord 1 is L ₀ ,
Letting ΔL be the variation due to the measurement of tension of the yarn feeder and other weft twist conditions, there is a relation of L = L ₀ + ΔL.

Since it is necessary to set L ₁ ≧ L in this way, the conventional technique inevitably has a length of 2 L or more, and there is a limit to the reduction of the length of the ear.

<Purpose of Invention> This invention has been proposed in view of the above-mentioned conventional problems. Even when the weft end portion of the weft is caught by the catch cord, there is a problem of folding back due to the rough movement of the weft end portion. While trying to prevent this, the length of the throw-off yarn is minimized to try to save the weft.

In the this invention for the "basic structure of invention", further the guide plate is provided at a position separated outward by a distance L ₂ from the catch cord with the fabric from selvage to the distance L _1, the guide plate When a resistance imparting portion for holding the weft yarn tip guided to the cloth fell side by the forward movement of the reed is formed, and the distance that the weft yarn tip can reach from the catch cord to the outside is L, the above L ₁ is L> L _When the size of ₁ > L ₂ is set to be satisfied and the height of the guide plate is H, this H is H ≧ L−kL ₁ − (k + 1) L ₂ (K is a constant) The gist is that it is set so as to satisfy the magnitude relationship of.

In this way, in the conventional technology, the distance is secured two-dimensionally outside the catch cord in order to avoid the occurrence of the folding back defect, whereas in the present invention, the idea is changed to the three-dimensional. The three-dimensional distance is secured by the height of the guide plate provided outside the catch cord.

<Operation of Device> The weft yarn jetted from the fluid jet nozzle passes through the catch cord on the side opposite to the yarn feeding side to reach the weft yarn catching device. Then, the tip of the weft is guided to the resistance applying portion in the process of beating, and is held there. After that, the weft is entangled with the catch cord, but since the pullout resistance is imparted by the weft end resistance imparting portion, the weft yarn does not come out of the resistance portion when the weft end violates.

Then, the weft thread slides on the resistance applying portion as it is entangled with the catch cord.

In the weft catching device of the present invention, a guide plate having a height enough to prevent the folded back weft end from reaching the cloth end is provided outside the catch cord. Therefore, even if the front end of the weft thread goes over the guide plate and folds back due to some cause, it does not reach the end of the cloth and is not woven into the end of the cloth.

<< First Embodiment >> A first embodiment of the present invention, as shown in FIGS.
L _{0 is} the length required only for the weft W to be entwined with the catch cord 1, the maximum variation length up to the weft W reaching position due to the tension of the yarn feeder, the pressure and flow rate of the jet fluid, the length measurement of the length measuring device itself, etc. When the length is ΔL, it extends parallel to the warp Y-row and extends in the weaving direction between the reed blades 7 of the reed located at a distance L ₂ outward from the catch cord 1 (L ₂ <L ₀ + ΔL). The thin guide plates 10 are provided alternately up and down. In addition, the distance from the cloth edge, which is the cutting point of the cutter 5, to the catch cord 1 is L ₁
Then, when the distance L ₁ is greater than or equal to the distance L ₂ from the catch cord 1 to the guide plate 10 and is smaller than the sum of the above distance L ₀ and the distance ΔL, the catch cord 1
Attach. Note that L ₁ must be at least larger than L ₀ .

The guide plate 10 has an inclined portion 11 inclined toward the cloth fell and a horizontal portion 13 extending parallel to the woven cloth CL, and the horizontal portions of the guide plates 10 arranged alternately above and below. As best understood from FIGS. 1 and 3, 13 are mutually intruded to form an overlapping portion, and the weft W positioned there is bent and held. This overlapping portion constitutes the resistance applying portion 15 for holding the weft W in the weft catching device of the present invention. Further, a substantially inverted V-shaped guide portion 16 is defined by the inclined portions 11 of the upper and lower guide plates 10 which are alternately arranged, and the tip end portion of the weft W reaching the guide portion 16 is given resistance by beating motion. It is forcibly guided to the portion 15 and holds the weft yarn end portion. The catch selvage-corresponding portion of the weft W held by the resistance applying portion is captured by the catch cord 1.

By the way, when the distance L ₂ is subtracted from the length obtained by adding L ₀ and ΔL, the distance is L ₃ , and the distance from the top 14 of the guide plate 10 to the cloth edge is L ₄ (L ₄ = k (L ₁ +
L ₂ ) and K are constants, the height dimension H of the guide plate 10, that is, the dimension between the horizontal portion 13 and the top portion 14 when the guide plate 10 is installed is the distance L ₃ from the distance L _3. Set it so that it is equal to or larger than the difference obtained by subtracting L ₄ .
That is, it is set so as to satisfy the relational expression of H ≧ L ₀ + ΔL−kL ₁ − (k + 1) L ₂ . Then, when the distance L ₁ from the cloth fell to the catch cord is set to be smaller than the sum of the distance L ₀ and ΔL, the tip of the weft W corresponding to L ₃ runs over and overruns the guide plate 10 for some reason. Even if the weft yarn W is folded back toward the woven fabric side, the tip of the weft W does not enter into the woven fabric, and the occurrence of weaving defects due to the folding back is prevented and the fabric quality can be improved. A preferable example is the distance L ₁
= L ₂ = L ₀ , and the height dimension H is H ≧ ΔL−2kL ₀ (k is a constant), the ear length can be suppressed to the occurrence of ΔL + 2L ₀ , and the maximum length is ΔL. The ear length will be shortened.

Although the resistance applying portion 15 in this embodiment is the overlapping portion formed by the overlapping of the horizontal portions, the present invention is not limited to this, and if the resistance necessary for holding the weft W is given, the resistance applying portion 15 is vertically moved. The horizontal portions of the guide plate 10 may be separated in the vertical direction.

The number of guide plates 10 shown in FIGS. 2 and 3 is two on the upper side and one on the lower side, but the number is not limited to this and may be one on the upper side and one on the lower side. . Also, if the number of upper and lower guide plates is increased as necessary, the weft W holding force is increased accordingly.

The setting of the height dimension H of the guide plate 10 is as described above,
It is not necessary to set all the guide plates 10 to such a height H.

High enough to prevent the tip of the weft W from entering the woven cloth when at least one of the upper and lower guide plates arranged in the weft insertion direction has the maximum variation in the weft insertion. You just have to have.

<< Other Embodiments >> In the above embodiments, the guide plate 10 is described as being fixed, but in another embodiment of the present invention, the guide plate is constructed so as not to interfere with weft insertion. Is. That is, as shown in FIGS. 5 and 6, a cam 41 having a predetermined lift amount is attached to a rotary shaft 40 that rotates in synchronization with the rotation of the loom. A cam ball 43 attached to one end of a rod 42 is in contact with the cam 41. rod
On the other end side (front side of the loom) of 42, a pair of V-shaped guide plates 46 that oscillate on a shaft 45 via a link 44 and face each other may be used. In this case, in order to prevent the guide plate 46 from interfering with weft insertion, as shown in FIG. 5, the guide plate 48 is set to be larger than the warp shed at least at the time of weft insertion, and after the weft insertion is completed. May be configured to be closed as shown in FIG. Reference numeral 50 in FIG. 5 is a resistance applying portion.

<Effect of device> According to this device, the distance from the cloth fell to the catch cord is set to be smaller than the distance that the weft end can reach from the catch cord, and for some reason, the outer side from the resistance applying portion is set. Even if the tip of the weft W at the position of the weft jumps over the wall surface of the guide plate, the length of the weft is consumed due to the height of the guide plate, so that the tip of the weft W does not reach the woven fabric, and as a result, weaving defects due to the weaving are caused. Therefore, the length of the throw-off ear can be shortened without deteriorating the quality of the fabric.

[Brief description of drawings]

1 to 3 are a side view, a front view and a plan view showing the periphery of the weft catching device of the yarn end treating device of the present invention. FIG. 4 is a plan view showing a conventional technique. 5 and 6 are a side view and a partial side view showing another embodiment of the present invention and its operation. 1 ... Catch cord, 3 ... False twist spindle 5 ... Cutter, 10, 46 ... Guide plate 13 ... Horizontal part, 16, 48 ... Guide part 15, 50 ... Resistance applying part, W ... Weft Y ... Warp

Claims (1)

[Scope of utility model registration request] 1. In a fluid jet loom, L ₁ from the cloth edge
The guide plate provided at a position further apart from the catch cord at a distance of ₂ by a distance L ₂ has a resistance imparting portion that holds the weft yarn tip guided to the cloth fell side by the forward movement of the reed. When the distance that the tip of the weft can reach from the cord to the outside is L, the above L ₁ satisfies the relationship of L> L ₁ > L ₂ and the height of the guide plate is H. In addition, the H satisfies the relationship of H ≧ L−kL ₁ − (k + 1) L ₂ (k is a constant), and the weft catching device of the yarn end treating device is characterized.