JPH0111745Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a drum-type weft storage device, and particularly to a means for preventing the weft from slipping in the circumferential direction on the yarn storage drum.

Prior art When the number of windings of the weft yarn on the yarn storage drum decreases, and at the contact area between the wound weft yarn and the yarn storage drum, the resistance due to the frictional force when the yarn is stationary is overcome by the tension of the weft yarn wound by the yarn guide. The weft yarn in the wrapped state tends to slip in the circumferential direction on the wrapping surface of the yarn storage drum.

Therefore, Utility Model Publication No. 48-59871 and Japanese Patent Application Publication No. 57-51839
The publication discloses providing a tension applying member and a high friction member on the drum surface. These members are effective in preventing the weft yarn from slipping on the drum in the circumferential direction, but they also act in the axial direction of the drum when the weft yarn is pulled out, that is, when it is inserted, thereby increasing the resistance of the weft insertion. It's summery. For this reason, the weft is not drawn out smoothly when it is inserted, and this results in a decrease in the accuracy of length measurement.

Purpose of the invention The purpose of the present invention is to prevent the weft from slipping on the yarn storage drum and at the same time reduce the frictional resistance during weft insertion.

Solution to the Invention Based on the above object, the present invention attaches a friction member to the winding surface of the yarn storage drum, thereby imparting directionality to the frictional force on the winding surface of the yarn storage drum. There is.

Structure of the invention FIGS. 1 to 3 show a drum-type weft storage device 1 according to the invention.

The weft storage device 1 includes a fixed yarn storage drum 2, a rotary yarn guide 3, and a locking pin 4. The yarn storage drum 2 has a small-diameter conical winding surface 6 and a cylindrical guide surface 7 on the weft 5 withdrawal side. The yarn guide 3 is rotatably mounted on the same axis as the yarn storage drum 2, guides the weft 5 from a yarn feeder (not shown), and winds the weft 5 onto the winding surface 6. The locking pin 4 is provided inside the yarn storage drum 2, protrudes outward from a hole 8 provided at the winding surface 6, and is attached to one end of the arm 10 by a connecting rod 9 in a retractable state. installed. This arm 10 is swingably attached to the yarn storage drum 2 by a support shaft 11, is biased clockwise by a spring 12, and is brought into contact with a cam 14 by a roller 13 at one end. . This cam 14 synchronizes with the rotation of the loom and sinks the protruding locking pin 4 from the winding surface 6 in accordance with the timing of weft insertion, so that the weft 5
will be released.

As a characteristic feature of the present invention, one or more friction members 15 are attached to the entire circumference or a portion of the winding surface 6, for example, near the locking pin 4. The friction member 15 is made of a rubber-based elastic material and has a square prism shape, for example, and has grooves 17 and protrusions 18 alternately formed along the axial direction of the yarn storage drum 2 on the outer friction surface 16. There is. Incidentally, this friction surface 16 is subjected to a baking treatment or a satin finish treatment as necessary.

Effect of the invention During length measurement storage, that is, when the locking pin 4 protrudes from the winding surface 6, the weft 5 is bent at right angles while being hooked on the locking pin 4, and then,
Each time they are sequentially wrapped around the outer periphery of the winding surface 6, the winding surface 6 and the friction surface 16 of the friction member 15 slide in the direction of the protrusions 18, moving in the diametrical direction due to friction, and are wound in an aligned state. In this way, at the initial stage of winding, the tension of the weft yarn 5 is relatively low, so the weft yarn 5
slides in the direction of the protrusion 18 under the coefficient of friction without giving any elastic deformation to the friction surface 16.

However, when the weft yarn 5 moves in the diametrical direction on the friction surface 16 and then comes to rest, the weft yarn 5
A coefficient of static friction that is larger than the coefficient of sliding friction acts between the surface 16 and the friction surface 16, and the weft yarn 5 is tightened in a loop, and the protrusions 18 contact the orthogonal weft yarn 5 and are deformed. In order to apply an elastic restoring force to the weft yarn 5, the weft yarn 5 in the wrapped state is
It will not slip on the yarn storage drum 2 in the circumferential direction. Therefore, the length measurement amount of the weft yarn 5 can be accurately regulated.

Also, when the timing for weft insertion comes, the locking pin 4 sinks from the winding surface 6, so the weft thread 5
The yarn is pulled out from the winding surface 6 in the axial direction of the yarn storage drum 2 by a weft insertion nozzle (not shown) at high speed. At this time of withdrawal, the weft yarn 5 immediately leaves the inclined friction surface 16. Therefore, since elastic frictional force no longer acts between the weft yarn and the friction member 15, the friction member 15 does not act as a resistance when the weft yarn 5 is let out.

As weft insertion approaches the end point, the number of windings of the weft yarn 5 on the yarn storage drum 2 decreases, but as long as the wound weft yarn 5 is in contact with the friction surface 16, the protrusions of the friction member 15 18 prevents the weft yarn 5 from slipping in the circumferential direction by static frictional force and elastic restoring force, so that the weft yarn 5 is not pulled back by the winding tension of the yarn guide 3, or is weft-inserted. Due to the inertia of the weft yarn 5 after completion, it will no longer be let out.

Incidentally, in this embodiment, the friction member 15 is provided near the locking pin 4. The reason for this is to float the weft yarn 5 near the locking pin 4 and prevent it from entering the hole 8, and also to bring the weft yarn 5 into contact with the friction member 15 as soon as possible at the beginning of winding after weft insertion is completed. It's for a reason.

Effect of invention According to the present invention, the following effects can be obtained.

Since the friction member intersects with the weft yarn on the conical winding surface and exerts elasticity, the wound weft yarn does not slip in the circumferential direction, so that length measurement can be performed accurately.

Furthermore, during weft insertion, the weft is instantly separated from the inclined friction member, and the elastic frictional force does not become a load during weft insertion, so weft insertion is performed smoothly at high speed.

[Brief explanation of drawings]

FIG. 1 is a sectional view of the main parts of the weft storage device of the present invention, FIG. 2 is a sectional view taken along the - line in FIG. 1,
FIG. 3 is a partial plan view of the friction member and the locking pin. 1... Weft storage device, 2... Yarn storage drum, 3...
... Yarn guide, 4 ... Locking pin, 5 ... Weft,
6...Wrapping surface, 15...Friction member, 16...Friction surface, 17...Groove, 18...Protrusion.

Claims (1)

[Scope of utility model registration request] A small-diameter conical winding surface is formed on the yarn storage drum on the weft withdrawal side, a friction member made of an elastic material is attached to this winding surface, and the shaft of the yarn storage drum is attached to the outer friction surface of this friction member. 1. A weft storage device characterized in that grooves and protrusions are formed alternately in the direction in which the weft is pulled out.