JPS6241349A - Weft yarn length measuring and storing method in shuttlelessloom - Google Patents

Abstract

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

Description

Detailed Description of the Invention Object of the Invention (Industrial Application Field) The present invention provides a weft locking body that winds a weft supplied from a weft supply source onto a yarn winding surface and engages with a similar winding surface MWa. The present invention relates to a weft length measurement and storage method in a shuttleless loom that controls weft insertion of the wound storage yarn on the yarn winding surface.

(Prior Art) Generally, in such a winding-type weft length measuring and storage device, the weft binding body engages and disengages from the yarn winding surface from outside or inside the drum forming the yarn winding surface, and the weft Controls length measurement and weft insertion.

The yarn winding surface consists of a tapered peripheral surface where the wound stored yarn quickly slides toward the weft insertion side due to the winding tension of the wound stored yarn, and a straight peripheral surface where the wound stored yarn cannot be slid to the weft insertion side due to the winding tension. Two pieces are used corresponding to the tapered circumferential surface and the straight circumferential surface. That is, the weft is pre-wound on the tapered circumferential surface without being locked by the first weft locking body intersecting with the tapered circumferential surface, and during this time, the wound stored yarn on the straight circumferential surface is inserted. . After weft insertion is completed, the first weft locking body is separated from the taber circumferential surface, the preliminary winding is transferred to the straight circumferential surface, and while being locked by the second weft locking body intersecting with the straight circumferential surface. Wrap the weft yarn for the weft insertion length on the straight circumference. And again the first
The weft locking body is made to intersect with the taper circumferential surface and preliminary winding is started on the taper circumferential surface.

However, in such a weft length measurement and storage method, since the diameter gap between the tapered circumferential surface and the straight circumferential surface is large, a large amount of slack occurs in the winding yarn transitioning from the tapered circumferential surface to the straight circumferential surface. Therefore, the length of the yarn protruding from the tip of the main nozzle for weft insertion before weft insertion becomes excessive, resulting in what is called an entry error in which the tip of the weft collides with the warp forming the opening during weft insertion. Also, after the weft insertion is completed and before the weft is cut, the preliminary winding that is locked in the first weft locking body is moved to the second weft locking body.
If the timing is such that the weft is transferred to the weft locking body side, the weft end portion will further become loose. In order to solve this problem, a weft gripping device installed between the drum and the main nozzle has been adopted, but an increase in cost becomes a new problem.

A means for controlling the weft by reciprocating a pair of weft locking bodies in the weft insertion direction is disclosed in JP-A-58-163759 and JP-A-58-197344.

In Japanese Unexamined Patent Publication No. 58-163759, the first weft locking body reciprocates on the tapered circumferential surface, locks and transfers the wound yarn on the tapered circumferential surface to the straight circumferential surface, and moves the yarn on the tapered circumferential surface to the straight circumferential surface. The second weft locking body, which reciprocates, receives and connects the winding yarn, and then releases the winding yarn after moving onto the straight peripheral surface.

In Japanese Unexamined Patent Publication No. 58-197344, a pair of weft locking bodies both reciprocate over a tapered circumferential surface and a straight circumferential surface, and both weft locking bodies alternately move on the tapered circumferential surface for a weft insertion length of 1. The weft yarn for each turn is retained and stored, and the winding yarn is released after transitioning to a straight circumferential weave.

(Problems to be Solved by the Invention) However, in the above-mentioned weft length measurement and storage means, the winding yarn is released at the start of weft insertion on the straight peripheral surface with a large diameter gap with respect to the tapered peripheral surface. The loosening phenomenon still cannot be eliminated, and furthermore, it is difficult to set the reciprocating drive timing of both weft thread locking bodies, and the drive mechanism is inevitably complicated.

Furthermore, as disclosed in Japanese Patent Laid-Open No. 58-197343, a means for controlling the weft by a single weft locking body that acts with the tapered peripheral surface of the drum has been considered, but the weft locking body and the bobbin winding Intersection with and separation from the surface must be carried out in a short period of time, making the timing unsuitable for high-speed looms such as jet looms. Furthermore, since the winding length measurement on the tapered circumferential surface is started in a state where there is no preliminary winding on the tapered circumferential surface, unevenness in length measurement is likely to occur due to fluctuations in the winding tension.

Structure of the Invention (Means for Solving the Problems) Therefore, in the present invention, the weft yarn supplied from the weft supply source is wound at two predetermined positions on the tapered circumferential surface of the yarn winding surface where the diameter is reduced toward the weft insertion side. A pair of weft thread locking bodies for weft control are respectively engaged and disengaged, and during the weft insertion period, preliminary winding is transferred from one weft thread locking body to the other weft thread locking body, and between the two engagement positions. After a length of weft for one weft insertion is wound and stored, the other weft locking body releases the weft to start weft insertion.

(Function) That is, preliminary winding is performed while being locked by the first weft locking body that engages and disengages from a predetermined position on the taper circumferential surface, and the first weft lock from the taper circumferential surface during the weft insertion period. By detaching the body, the preliminary winding is transferred to the second weft locking body. Before this transition, a second weft thread locking body engages with the tapered circumferential surface, and the preliminary winding is locked with the second weft thread locking body. In this state, the weft is further supplied, and the weft for one weft insertion length is wound and stored on the second weft locking body side.

Thereafter, the first weft locking body engages with the tapered circumferential surface, and the first
Preliminary winding is carried out while being held by the second weft holding body, and the second weft holding body moves IiIM from the tapered circumferential surface, the wound stored yarn is released, and weft insertion is performed. Therefore, the transition of preliminary winding from the first weft locking body to the second weft locking body is performed during the weft insertion period, and loosening of the winding yarn is suppressed, thereby preventing weft insertion errors. In addition, preliminary winding is performed in a state in which the weft yarn corresponding to the weft insertion length is wound between the first and second weft binding bodies, that is, in a state in which the winding tension of the wound storage yarn between both weft binding bodies is always constant. Because this is done, uneven length measurement of the preliminary winding may occur.
＜, Accurate length measurement becomes possible. Further, since the weft for one weft insertion length is wound and stored between both weft locking bodies, and then the weft insertion is performed, it is easy to set the weft control timing.

(Example) Hereinafter, an example embodying the present invention will be described based on the drawings.

A support bracket 1 having an auxiliary arm 1a is fixed to a fixed part such as a side frame of a loom, and a rotation support shaft 2 is rotatably mounted through the support bracket 1. Weft supply limit at the shaft center (path shown)
Weft guide hole 2a for guiding the weft Y supplied from
A timing pulley 3 is fixed between the main body of the support bracket 1 and the auxiliary arm 1a.

A gear 4 is fixed to the front surface of the support bracket 1.
On the front side thereof, there is a weft guide hole 2 that obliquely intersects with the rotation support shaft 2.
A thread-wound tube 6 connected to the drum 6 is mounted and supported, and its tip opening is disposed on a tapered peripheral surface 8a of a drum 8, which will be described later. A support tube 7 is supported at the tip of the rotary support shaft 2 so as to be relatively rotatable, and a gear 7a is formed on the circumferential surface of the support tube 7, and a tapered circumference whose diameter decreases toward the front is formed on the front surface of the support tube 7. A drum 8 is fixedly attached to the drum 8, which has a thread winding surface consisting of a surface 8a and a straight circumferential surface 8b continuous to the small diameter side of the circumferential surface 8a.

A planetary gear mechanism 9 is fixed to the support 5, and an input planetary gear 9a is meshed with the gear 4, and an output planetary gear 9b is meshed with the gear 7a. When the rotary support shaft 2 is rotated by this, the thread-wound tube 6 rotates integrally with the support shaft 2, and the planetary gear mechanism 9 also rotates integrally, so that the two inverted star gears 9a and 9b rotate with the gear 4. , 7a, the drum 8 revolves around the rotation support shaft 2, and the drum 8 is held stationary without rotating. Then, as the yarn winding tube 6 revolves around the drum 8, the weft yarn Y is wound around the circumferential surface of the drum 8. When winding the yarn, the tube 6 rotates multiple times per one rotation of the machine, and the weft yarn Y is wound around the drum 8 multiple times.

As shown in FIG. 2, a drive shaft lO is arranged parallel to the rotation support shaft 2 on the side of the drum 8, and the tapered peripheral surface 8
A pair of cams 11 and 12 are fixed at positions corresponding to a. Further, a timing pulley 13 is fixed to the drive shaft 10 at a position corresponding to the timing pulley 3, and both timing pulleys 3 and 13 are attached to a timing belt 14.
are operatively connected. In this embodiment, the diameter of the timing pulley 13 is set to four times that of the timing pulley 3, so that the rotation support shaft 2 rotates four times for one rotation of the drive shaft 10, which rotates in synchronization with the machine base. ing.

A shaft 15 is connected between the rotation support shaft 2 and the drive shaft 10.
A pair of swing levers 16.17 are rotatably supported on the shaft 15 in correspondence with the cams 11.12. Cam followers 16a and 17'a provided at one end of both levers 16.17 are pressed onto the cam surfaces of both cams 11.12 by tension springs 18.19, and as a result of the rotation of cams 11.12, First and second weft locking bodies 20.21 are attached to the other ends of the participating swing levers 16.17, which allow the swing levers 16 and 17 to swing around the shaft 15. As the swinging lever 16.17 swings, the tips of both weft binding bodies 20.21 move into and out of the holes 8c and 13d on the tapered peripheral surface 8a.

The storage and weft insertion of the weft yarn Y supplied from the yarn winding tube 6 onto the yarn winding surface are controlled by the intersection and separation between the two weft locking bodies 20 and 21 and the yarn winding surface. By separating the stopper body 21 from the tapered circumferential surface 8a, the wound stored yarn can be pulled out from the drum 8. Then, the wound and stored yarn on the drum 8 is transferred to the drum 8 during weft insertion by a main weft insertion nozzle (not shown) disposed in front of the drum 8.
The weft is pulled out from the main nozzle and inserted into the weft through the same main nozzle. - Now, the cam shapes and angular positional relationships of the cams 11 and 12 are set as shown in FIG.
12 and the tapered circumferential surface 8a exhibit a state shown in FIG. A curve C1 in the same figure shows a state where the first weft locking body 20 and the tapered circumferential surface 8a intersect and are separated, and a curve C2 shows a state where the first weft thread stopper 20 and the tapered peripheral surface 8a intersect and are separated from each other.
The weft locking body 21 and the tapered circumferential surface 8a intersect and are separated from each other.

At the machine rotation angle position θ4 shown in FIG. 9, both weft locking bodies 2
0.21 intersects with the tapered circumferential surface 8a, and as shown in FIG. 3, four turns of weft Y are stored between both weft binding bodies 20.21 (hereinafter referred to as wrapped storage yarn Y1). . This state continues until the machine rotation angle position α shown in FIG. .

At the machine rotation angle position α, the second weft locking body 21 separates from the tapered circumferential surface 8a, and as shown in FIG.
1 moves from the tapered circumferential surface 8a to the straight circumferential surface 8b side due to the winding tension, and weft insertion is started.

While the wrapped storage yarn Y1 that has moved onto the straight circumferential surface 8b is being pulled out from the drum 8, as shown in FIG.
Preliminary winding is performed between the weft locking body 20 and the thread winding tube 6.

As shown in FIG. 9, when the machine base reaches the rotation angle position β, the first weft locking body 20 intersects with the tapered peripheral surface 8a, and the second weft locking body 21 moves from the tapered peripheral surface 8a. As shown in FIG.
Move to side 1. When the machine base reaches the machine base rotation angle position θ3 shown in FIG. 9, the first weft locking body 2 is moved as shown in FIG.
The weft yarn Y is wound three times between the intersection position of 0 and the tapered circumferential surface 8a and the second weft locking body 21, and then the wound storage yarn Yl on the straight circumferential surface 8b is all pulled out. ,
As shown in FIG. 8, the weft yarn Y extending from the drum 8 to the main nozzle for weft insertion is locked by the second weft locking body 21, and weft insertion is completed.

When the machine base reaches the rotation angle position γ as shown in FIG. 9, the first weft locking body 20 intersects with the tapered peripheral surface 8a, and as shown in FIG. 3, both weft locking bodies 20. Between 21 and 21, the length of the weft for one weft insertion is wound and stored.

In the state shown in FIG. 3, that is, at the time when preliminary winding is started between the first weft locking body 20 and the thread winding tube 6, one weft insertion length is provided between the two weft locking bodies 20 and 21. Since the weft yarn corresponding to the number of turns is wound four times, the winding tension due to this wound storage yarn Yl is constant, and therefore the variation in the winding tension of the preliminary winding is also reduced. Therefore, there is no unevenness in the weft length measurement due to the locking of the first weft locking body 20, and the transition of the preliminary winding from the first weft locking body 20 to the second weft locking body 21 side. The winding is always performed stably, and the crossing of the winding threads is suppressed.

In the process from FIG. 5 to FIG. 6, both weft locking bodies 2
0 and 21 intersect and separate at the same time at the machine rotation angle position β, but the intersection of the second weft locking body 21 is caused by the wrapped storage yarn Yl.
may be any time after passing through the hole 8d and moving to the straight circumferential surface 8b side and before the end of weft insertion, or
The separation of the first weft locking body 20 is arbitrary from the time when the second weft locking body 21 intersects with the tapered circumferential surface 8a until the end of weft insertion. That is, a considerable margin can be given to the timing setting for transferring the preliminary winding that has been locked by the first weft locking body 20 to the second weft locking body 21 side. In the conventional device in which the second weft locking body is disposed on the straight circumferential surface, the separation and crossing timing of the second weft yarn locking body is set after the last turn of the wound storage yarn starts to be unwound, and Between the time of unwinding and the end of weft insertion, the preliminary winding must be transferred from the first weft locking body to the second weft locking body, and this timing adjustment is extremely difficult and the yarn type changes. There is also the complexity of having to adjust the timing each time.

Furthermore, since the gap in the diameter of the tapered peripheral surface 8a between the first weft locking body 20 and the second weft locking body 21 is small, the loosening of the winding yarn due to the transition to preliminary winding occurs during the weft insertion period. In addition to this, the number of threads is suppressed to a minimum, and crossing of the winding threads with each other is avoided. Moreover, in the state shown in FIG. 4, that is, at the start of weft insertion, the yarn length protruding from the tip of the main weft insertion nozzle does not become excessive, and errors in weft insertion are prevented.

Furthermore, in the state shown in FIG. 8, that is, at the end of weft insertion, the weft has been wound and stored in three or more turns while being locked by the second weft locking body 21, so that the second weft locking body 21 is not locked. The increase in tension at the end of weft insertion will not adversely affect the storage posture of the wound storage yarn Y1.

Furthermore, since both weft locking bodies 20 and 21 engage and disengage from predetermined positions on the taber circumferential surface 8a, the troublesome mechanism required in conventional devices that reciprocates the weft yarn locking bodies in the weft insertion direction is unnecessary. A mechanism similar to that of a conventional device in which a pair of weft locking bodies engage and disengage from the tapered circumferential surface and the straight circumferential surface is sufficient.

The present invention is, of course, not limited to the above-mentioned embodiments, and can be embodied, for example, in a weft length measuring and storage device in which a weft locking body is moved in and out of a drum that forms a thread winding surface.

Effects of the Invention As detailed above, the weft length measurement and storage method of the present invention has a structure that is less complicated than the conventional structure in which a pair of weft locking bodies are engaged and disengaged from each predetermined position on the thread winding surface. The control timing of the weft thread on the thread winding surface can be easily set, and the loosening of the thread moving on the thread winding surface can be suppressed to prevent weft insertion errors, as well as eliminate uneven length measurements. It has an excellent effect of obtaining.

[Brief explanation of drawings]

The drawings show an embodiment embodying the present invention, FIG. 1 is a side view showing the entire weft length measuring and storage device, FIG. 2 is a front view of the device, and FIGS. FIG. 9 is a side view of the main part for detailed explanation, and is a graph showing weft control on the thread winding surface.

Claims (1)

[Claims] 1 A pair of weft thread locking bodies for weft thread control are engaged and disengaged from the tapered circumferential surface of the thread winding surface on which the weft thread supplied from the weft supply source is wound, the diameter of which decreases toward the weft insertion side. The preliminary winding was transferred from one weft locking body to the other weft locking body, and a weft with a length equivalent to one weft insertion was wound and stored between each engagement position between both weft locking bodies and the tapered peripheral surface. The method for measuring and storing weft yarn length in a shuttleless loom, wherein the other weft locking body then releases the weft yarn and starts inserting the weft yarn.