JPH0367127B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention winds a weft supplied from a weft supply source onto a thread winding surface, and uses a weft locking body that engages and disengages from the thread winding surface to stop the thread from winding. The present invention relates to a weft length measurement and storage method in a shuttleless loom that controls weft insertion of wound storage yarn on a facing surface.

(Prior Art) Generally, in such a winding-type weft length measuring and storage device, the weft locking 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 while being locked by the first weft locking body intersecting with the tapered circumferential surface, and during this time, the wound storage yarn on the straight circumferential surface is inserted. . After weft insertion is completed, the first weft locking body is separated from the tapered peripheral surface, the preliminary winding is moved to the straight peripheral surface side, and is locked by the second weft locking body intersecting with the straight peripheral surface. While doing so, wind the weft yarn for the weft insertion length on the straight circumference. Then, the first weft locking body is made to cross the tapered circumferential surface again, and preliminary winding is started on the tapered circumferential surface.

However, in such a weft length measurement and storage method, the diameter gap between the tapered circumferential surface and the straight circumferential surface is large, so that a large amount of slack occurs in the wound 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.

Furthermore, in Japanese Patent Application Laid-Open No. 58-180640, two weft locking bodies are arranged on the inclined surface of a drum for winding and storing weft yarns, and the weft for one weft insertion is wound between both weft locking bodies. A length measuring device for weft yarns that is attached and stored is disclosed. However, in this known weft length measuring device, the weft for one weft insertion is wound around a first weft locking body on the weft winding side, and the first weft locking body is released after weft insertion is completed. and the second one on the weft drawer side.
Since the structure is such that the weft yarn is moved to the weft locking body side, the weft yarn becomes loose up to the weft end, and as a result, the weft end portion becomes loose, causing problems such as tissue collapse.

In order to solve this problem, a weft gripping device installed between the drum and the main nozzle has been adopted, but in this case, a new problem is increased cost.

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 Patent Application Laid-Open No. 58-163759, the first weft locking body reciprocates on the tapered circumferential surface, moves the wound yarn on the tapered circumferential surface to the straight circumferential side while locking it, and moves the yarn on the tapered circumferential surface to the straight circumferential side. A second weft locking body reciprocating above takes over the winding yarn and releases the winding yarn after moving further onto the straight peripheral surface.

In Japanese Patent Application Laid-Open No. 58-197344, a pair of weft locking bodies both reciprocate over a tapered peripheral surface and a straight peripheral surface, and both weft locking bodies alternately adjust the weft insertion length on the tapered peripheral surface. The weft yarn for one run is retained and stored.
In addition, the winding thread is released after moving to the straight peripheral surface side.

(Problem to be Solved by the Invention) However, in the above-mentioned weft length measuring and storage means, the winding yarn is released at the start of weft insertion on a straight peripheral surface with a large diameter gap with respect to the tapered peripheral surface, so that the winding yarn becomes loose. It is still not possible to eliminate the above phenomenon, and furthermore, it is difficult to set the reciprocating drive timing of both weft thread locking bodies, and the drive mechanism becomes unavoidably complicated.

Furthermore, as disclosed in JP-A-58-197343, a means for controlling the weft yarn using a single weft locking body that acts with the tapered peripheral surface of the drum has been considered, but the weft yarn locking body and the bobbin winding Intersection with and separation from the facing 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, a weft wrapping side is formed on a tapered circumferential surface that is warped toward the weft insertion side of the yarn winding surface on which the weft yarn supplied from the weft supply source is wound. A pair of weft locking bodies for weft control consisting of a first weft locking body disposed on the weft pull-out side and a second weft locking body disposed on the weft drawer side are engaged and disengaged, and During the weft insertion period, the preliminary winding that is locked and wound around the first weft locking body is transferred to the second weft locking body, and each engagement position between both weft locking bodies and the tapered circumferential surface is adjusted. After winding and storing a weft with a length equivalent to one weft insertion, the second weft locking body releases the weft and starts 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, preliminary winding is performed while being locked by the first weft locking body, and the second weft locking body separates from the tapered circumferential surface. and the wrapped storage yarn is released,
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, the weft yarn for the weft insertion length is wound between the first and second weft locking bodies, that is, the winding tension of the wound storage yarn between both weft locking bodies is always constant. Since winding is performed, length measurement irregularities in the preliminary winding are less likely to occur, and accurate length measurement is 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 rotary support shaft 2 is rotatably mounted through the support bracket 1. A weft guide hole 2a for guiding the weft Y supplied from a weft supply source (not shown) is formed in the axial center of the rotation support shaft 2, and a weft guide hole 2a is formed between the support bracket 1 main body and the auxiliary arm 1a. The timing pulley 3 is fixedly attached.
A gear 4 is fixed to the front surface of the support bracket 1, and a thread winding tube 6 obliquely intersecting with the rotation support shaft 2 and communicating with the weft guide hole 2a is mounted and supported on the front side of the gear. Drum 8 whose opening will be described later
It is arranged on the tapered peripheral surface 8a of. A support tube 7 is supported at the tip of the rotation 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 rotation support shaft 2 is rotated by this, the thread-wrapped tube 6
rotates integrally with the support shaft 2, and the planetary gear mechanism 9 also rotates integrally, so that both planetary gears 9a,
9b engages with gears 4 and 7a while rotating support shaft 2
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. The thread winding tube 6 is the machine base 1
It rotates multiple times in response to the rotation, and the weft yarn Y is placed on the drum 8.
is wrapped multiple times.

As shown in FIG. 2, a drive shaft 10 is arranged parallel to the rotation support shaft 2 on the side of the drum 8, and a pair of cams 11 and 12 are stopped at positions corresponding to the tapered peripheral surface 8a. It is worn. 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 operatively connected by a timing belt 14. In this embodiment, the diameter of the timing pulley 13 is set to four times that of the timing pulley 3, and the drive shaft 1 rotates in synchronization with the machine base.
The rotation support shaft 2 rotates four times for one rotation of zero.

A shaft 15 is disposed between the rotation support shaft 2 and the drive shaft 10 in parallel with both shafts 2 and 10, and both cams 1
A pair of swing levers 16 and 17 are rotatably supported on the shaft 15 in correspondence with the swing levers 1 and 12. Cam followers 16a and 17a provided at one end of both levers 16 and 17 are pressed against the cam surfaces of both cams 11 and 12 by tension springs 18 and 19, and swing as the cams 11 and 12 rotate. Lever 1
6 and 17 are adapted to swing around a shaft 15. At the other ends of both swing levers 16 and 17, there is a first weft locking body 2 on the side where the weft is wound by the yarn winding tube 6.
0, and a second weft locking body 21 is attached to the drawer side of the wound and stored weft, and as the swinging levers 16 and 17 swing, both weft locking bodies 2
The tips of 0 and 21 are holes 8c on the tapered peripheral surface 8a,
It is designed to enter and exit within 8d. 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, 21 and the yarn winding surface, and when weft insertion, the weft yarn Y is controlled by the second weft anchor. By separating the stopper body 21 from the tapered circumferential surface 8a, the wound stored yarn can be pulled out from the drum 8. The stored yarn wound on the drum 8 is pulled out from the drum 8 by a weft insertion main nozzle (not shown) disposed in front of the drum 8 at the time of weft insertion, and is ejected from the main nozzle and inserted.

Now, the cam shapes and angular positional relationship of the cams 11 and 12 are set as shown in FIG. 2, and the intersecting distance between both weft locking bodies 11 and 12 and the tapered peripheral surface 8a is as shown in FIG. exhibits. 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 second weft locking body 21 and the tapered circumferential surface 8a cross and separate.

At the machine rotation angle position θ4 shown in FIG. 9, both weft locking bodies 20 and 21 are in a state of intersecting with the tapered circumferential surface 8a, and as shown in FIG.
4 winds of weft Y are stored between 1 (hereinafter referred to as "wound storage yarn Y")
1) has been done. This state continues until the machine rotation angle position α shown in FIG.
The weft Y is pre-wound once between.

At the machine rotation angle position α, the second weft locking body 21
is separated from the tapered circumferential surface 8a, and as shown in FIG. 4, the wound stored yarn Y1 moves from the tapered circumferential surface 8a to the straight circumferential surface 8b side due to the winding tension, and weft insertion is started. Straight peripheral surface 8b
While the wound storage yarn Y1 that has moved upward is being pulled out from the drum 8, preliminary winding is being performed between the first weft locking body 20 and the yarn winding tube 6, as shown in FIG. .

As shown in FIG. 9, when the machine base reaches the rotation angle position β, the first weft locking body 20 separates from the tapered peripheral surface 8a, and the second weft locking body 21 moves away from the tapered peripheral surface 8a. They intersect, and the preliminary winding moves to the second weft locking body 21 side as shown in FIG. When the machine base reaches the machine base rotation angle position θ3 shown in FIG. 9, the intersection position of the first weft thread locking body 20 and the tapered circumferential surface 8a and the second weft thread locking body as shown in FIG. The weft yarn Y is wound three times between the weft yarn Y and the body 21, and then all of the wound stored yarn Y1 on the straight circumferential surface 8b is pulled out and reaches the main nozzle for weft insertion from the drum 8 as shown in FIG. The weft yarn Y 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. , 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 yarn winding tube 6, the weft insertion length is 1 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 Y1 is constant.
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 moreover,
The transition of the preliminary winding from the weft locking body 20 to the second weft locking body 21 side is always performed stably, and crossing of the winding yarns with each other is suppressed.

In the process from FIG. 5 to FIG. 6, both weft locking bodies 20 and 21 intersect and separate at the same time at the machine rotation angle position β, but the crossing of the second weft locking body 21 is caused by the winding and storage. Any time after the yarn Y1 crosses the second weft locking body 21 and the tapered circumferential surface 8a, that is, after passing through the hole 8d and moving to the straight circumferential surface 8b side, but before the end of weft insertion, may be used. Further, 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 arranged on the straight peripheral surface,
The separation and crossing timing of the second weft locking body is after the last winding of the wound stored yarn begins to unwind, and between this unwinding time and the end of weft insertion, the first weft locking body It is necessary to transfer the preliminary winding from the weft to the second weft locking body, and this timing adjustment is extremely difficult, and the timing must be adjusted each time the yarn type changes, which is complicated.

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, it is suppressed to a state where there is almost no intersecting threads, 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 thread is held in place by the second weft thread stopper 21.
Since more than one turn is stored, an increase in tension at the end of weft insertion due to the locking of the second weft locking body 21 does 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 tapered 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 a tapered circumferential surface and a 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, according to the weft length measurement and storage method of the present invention, the method 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 yarn on the bobbin winding surface can be easily set, and since the preliminary winding is performed during the weft insertion period, loosening of the winding yarn transferred on the bobbin winding surface can be suppressed and weft insertion mistakes can be avoided. This has an excellent effect of being able to prevent this and eliminate unevenness in length measurement.

[Brief explanation of drawings]

The drawings show an embodiment embodying the present invention, and FIG. 1 is a side view showing the entire weft length measuring and storage device;
FIG. 2 is a front view of the same device, FIGS. 3 to 8 are side views of essential parts for explaining the operation of the present invention, and FIG. 9 is a graph showing weft control on the yarn winding surface. Drum constituting the yarn winding surface...8, Tapered peripheral surface...8a, Weft locking body...20, 21, Weft...
Y, Wrapped storage thread...Y1.

Claims (1)

[Claims] 1. A first weft locking body disposed on the weft winding side and a weft pull-out side on a tapered peripheral surface that becomes warped toward the weft insertion side of the weft winding surface around which the weft supplied from the weft supply source is wound. A pair of weft thread locking bodies for weft control consisting of a second weft locking body disposed in the first weft locking body are disengaged from each other, and the spare thread is locked and wound around the first weft thread locking body. After the winding is transferred to the second weft locking body side during the weft insertion period, and a weft with a length equivalent to one weft insertion is wound and stored between each engagement position between both weft locking bodies and the tapered peripheral surface. A method for measuring and storing a weft length in a shuttleless loom, wherein the second weft locking body releases the weft and starts inserting the weft.