JPS5854049A - Weft yarn storage apparatus of shuttleless loom - 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 The present invention relates to a drum-type weft storage device for a shuttleless loom in which the weft is wound a predetermined number of times around a drum and stored therein, and in particular, the drum is configured using a plurality of divided pieces to increase the storage amount. The present invention relates to an improvement of a weft storage device that allows adjustment of the weft yarn storage device.

As a drum-type weft storage device, the drum is constructed using a plurality of divided pieces, and each divided piece is attached to a support so that its position can be adjusted.The storage amount is variable according to the drum diameter, and the weft insertion A version that can accommodate changes in length (inside the paper) has been proposed (Japanese Patent Application No. 55-9864).
9 excerpts.

However, in such a drum split type, gaps are formed between the split pieces, resulting in the following problems. That is, during weft insertion during normal operation of the loom, the weft yarn is unwound at a high speed, resulting in so-called ballooning.
However, when the weft yarn stored in the drum is pulled out by hand, such as during manual weft insertion, the pulling speed is slow, so ballooning hardly occurs, and the weft yarn is unwound along the drum surface. As a result, the weft yarn falls into the gap between the divided pieces, and there is a problem that the weft yarn cannot be pulled out.

For this reason, the present applicant has proposed that the outer edge of the seventh part be in contact with or close to the end surface of the drum on the weft drawer side, and at least be located opposite to the gap between the divided pieces, at the same level as the drum surface or on the outer side thereof. It has also been proposed that a yarn guide is provided to prevent the weft from falling into the gap (Japanese Patent Application No. 1983).
No. 5-123998).

However, when using such a thread guide, when changing the drum diameter by adjusting the mounting position of the drum segment, the thread guide position must be readjusted and the thread guide mounting position may be adjusted. It is necessary to set the position at the optimum position with respect to the divided pieces, which takes time for adjustment work, and there is still room for improvement.

The present invention has been made in view of the above-mentioned circumstances, and involves winding a thread guide made of an elastic wire material around the outer circumferential surface of the drum on the weft pull-out side so as to span the gap between the divided pieces of the drum.
1. In addition to preventing the weft yarn from falling into the gap between them, when the diameter of the drum is changed by adjusting the installation position of the divided pieces of the drum, the yarn guide made of elastic wire follows this and changes its diameter. This is what I did.

Hereinafter, the present invention will be explained based on the drawings.

Figures 1 to 3 show an embodiment of the present invention (3) There is.

In the figure, 1 is the frame of the loom, 2 is a weft insertion air injection nozzle held in a nozzle holder 3 installed upright on the frame 1, and 4 is attached to a stay 5 fixed to the nozzle holder 3, and 4 is attached to a stay 5 fixed to the nozzle holder 3. A guide placed at the rear (on the left in the figure), the weft yarn 6 guided from a weft storage device (to be described later) is guided by the guide 4 and passed through the air injection nozzle 2, so that the weft yarn 6 is guided through the air injection nozzle 2 when inserting the weft. The jetted air inserts the weft into a weft opening (not shown).

To explain the weft storage device, the lower end of a bracket 9 whose upper end is formed as a bearing part 9a is fixed with a bolt 10 to a bracket 8 which is fixed to the outer surface of the frame 1 with a bolt 7 and arranged horizontally. The axis of the bearing portion 9a is made to coincide with the axis of the guide 4. A rotary shaft 12 is rotatably supported on the bearing portion 9a via a ball bearing 11, and a toothed pulley 13 fixed to the rotary shaft 12 and a drive pulley (not shown) of the loom are provided with teeth. bell with bell (4
) (not shown) so that one rotational shaft per rotation of the loom.
2 rotates, for example, three times.

A drum support 16 is supported at the front end of the rotating shaft 12 via a ball bearing 15 so as to be relatively rotatable, and the drum 1T is attached to this support 16. This drum 17 has three divided pieces 18 and 9, each divided piece 18 has a long hole 19 formed long in the radial direction, and a screw 20 inserted into the long hole 19 is screwed into the drum support 16. By attaching the drum, each divided piece 18 is guided to move in the radial direction, and the fixed position can be adjusted, thereby making the drum diameter variable. Reference numeral 21 indicates a guide slot formed in the drum support 16, and 22 indicates a guide bottle inserted into the slot 21 provided in each divided piece 18.

Then, on the drum 17, therefore, on the surface of each divided piece 18, a tapered part 17a whose outer diameter gradually decreases from the rear end side toward the front end side, and a straight part 17b continuous with the same diameter at the minimum diameter part are formed. The straight part 17b has approximately 3
The length of the weft thread 6 wound around is the length of one weft insertion.

Also, a magnet (not shown) is located in a part of the drum 17.
A magnet (not shown) supported by the boat 23 erected on the bracket 8 is attached to the drum 1.
7. The drum 1T is held stationary by facing from the outside.

Further, as shown in FIG. 3, a circumferential groove is formed on the circumferential surface of the straight portion 17b of the divided piece 18 of the drum 170 on the weft pull-out side. A spiral thread guide 25 made of an elastic wire such as piano wire is fitted into the circumferential groove 24. This thread guide 25 is formed into a coil shape with about two turns, which is slightly smaller than the release circle at the bottom of the circumferential groove 24 when the divided pieces 1B are closest to each other, and when the thread guide 25 is slightly expanded, 17, the drum 170 comes into close contact with the outer peripheral surface of the divided piece 18 due to its spring force.

It is recommended that one end of the thread guide 25 be bent into an L-shape and hooked into the gap between the divided pieces 18, as shown in FIG. 2, to restrict the movement of the thread guide 25 and prevent it from falling off. desirable.

Furthermore, the axis of the rotating shaft 12 is provided with a thread guide hole 2 that opens at the rear end surface.
6 is formed, and an extraction hole 2 is formed on the surface of the rotating shaft 120.
7 is opened, and the inner part of the thread guide hole 26 and the pull-out hole 27 are communicated with each other. 28 is a guide bush. A thread guide 29 is fixed to a surface in front of the pull-out hole 27 of the rotating shaft 12, the tip of which is bent obliquely and faces the tapered portion 17a of the drum 17, and the tip of the thread guide 29 has a guide groove. 30 are provided.

Here, the weft yarn 6 pulled out from the yarn feeding means (not shown) is pulled through the yarn guide hole 26 and the pull-out hole 27 of the rotating shaft 12, and then pulled through the guide groove 30 along the yarn guide 29. Thereafter, it is wound around the tapered part 17a and the straight part 17b of the drum 1T, and is engaged with at least one of first and second engagement levers 31 and 32, which will be described later, and then pulled through the guide 4.

The first and second locking levers 31 and 32 are rotatably pivoted to a fixed shaft 33, and locking portions 3 formed at their tips
1a and 32a face the vicinity of the boundary between the tapered part 17a and the straight part 17b of the drum 17 and the holes 34 and 35 protruding from the straight part 17b (7), and are rotated at the appropriate time to open them. The locking portions 31a, 32a of the drum 17 are adapted to enter or exit the holes 34, 35 of the drum 17.

Next, the action will be explained.

During operation of the loom, the rotating shaft 12 rotates three times per rotation of the loom, but the drum 17 does not rotate due to the attractive force between the magnet attached to it and the fixed magnet. Therefore, rotation axis 1
2, the yarn guide 29 rotates around the drum 17, and the weft yarn 6 is wound around the tapered portion 17a of the drum 17. Then, the weft thread 6 wound around the tapered part 17a of the drum 17 falls down the tapered part 17a due to its own tension, pushing down the previous one and pushing the straight part 17b.
Move to.

If we explain the starting point immediately before weft insertion, at this time the locking portions 31a, 3 of the first and second locking levers 31,32
2a protrudes into holes 34 and 35 of the drum 1T. In this state, the weft yarn 6 is locked by the locking part 31a of the first (8) locking lever 31, wound around the straight part 17b of the drum 17 three times, and then the weft yarn 6 is locked by the locking part 31a of the first (8) locking lever 31, and then wound around the straight part 17b of the drum 17 three times. It is locked by a locking portion 32a.

When the loom rotates from this state, the second locking lever 32
The locking portion 32a exits from the hole 35 of the drum 1T, the lock on the weft 6 is released, and the weft 6 is inserted by the air injection from the nozzle 2 that starts immediately before this. When the winding amount of the straight part 17b of the citram 17 becomes 0 due to this weft insertion, the weft yarn 6 is locked to the locking part 31a of the first locking lever 31, and weft insertion is completed. Since the thread guide 29 rotates approximately once, the first locking lever 3
The weft 6 is wound approximately once around the side of the tapered portion 17a from the locking portion 31a of the weft 1.

Immediately after this, first, the locking portion 32a of the second locking lever 32 is
enters the hole 35 of the drum 17 again, and then the locking portion 31a of the first locking lever 31 exits from the hole 34 of the drum 17. Then, the weft yarn 6 wound around the tapered portion 17a
It falls down and moves to the straight portion 17b, and is locked by the locking portion 32a of the second locking lever 32.

When the weft yarn 6 is wound around the straight portion 17b nearly three times, the locking portion 31a of the first locking lever 31 connects the weft portion being wound around the tapered portion 17a with the straight portion 1.
It enters between the weft yarn portion wound around 7b and separates them. Immediately after this, weft insertion is performed as described above.

In such a weft storage device, the length of the weft 6 that is wound around the straight part 17b of the drum 1T approximately three times and stored between the first and second locking levers 31 and 32 before weft insertion is 1. Therefore, by changing the diameter, the storage amount υ and therefore the weft insertion length can be changed. That is, by loosening the screws 20 and moving each divided piece 18 a suitable distance in the radial direction, the drum diameter can be changed.
It is only necessary to tighten the screw 20 when the desired drum diameter is reached.

At this time, the thread guide 25 wound around the outer peripheral surface of the divided piece 18 of the drum 17 expands or contracts along the outer surface of the drum 17 as the drum diameter changes, and is brought into close contact with the drum 17 by its spring force. Therefore, the adjustment work of the thread guide 25 becomes unnecessary.

Further, when the weft yarn 6 is pulled out from the drum 17 by manually pulling the weft yarn 6 ahead of the guide 4, the weft yarn 6 is pulled out while being in contact with the outer peripheral surface of the yarn guide 25, and the outer peripheral surface of the drum 17 and the yarn guide 25 is pulled out. Since it is stretched between the split piece 1
There are no words to fall into the gap between 8 and 8.

Furthermore, in this embodiment, as shown in FIG.
The weft thread 6 extends between the end of the weft thread drawer side and the guide 4.
However, at the end of the straight portion 17b of the drum 17,
Since the weft yarn 6 is designed to contact the outer peripheral surface of the yarn guide 25, the weft yarn 6 does not come into contact with the end of the straight portion 17b of the drum 17, and the sliding contact between the end of the drum 17 and the weft yarn 6 prevents the weft yarn 6 from contacting the end of the straight portion 17b of the drum 17. Abrasion of the edges can be prevented. Note that thread guide 2
5 need only span at least the gap between the divided pieces 18, and does not need to be completely annular.

As explained above, according to the present invention, it is possible to prevent the elastic wire from falling on the outer circumferential surface of the weft drawer side of the divided piece of the drum, and the thread guide can be adjusted to this when changing the drum diameter. Since the yarn guide is deformed and there is no need to readjust the yarn guide, it is possible to extremely easily adjust the storage amount.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a weft storage device showing an embodiment of the present invention, FIG. 2 is a view taken along the arrows ■-■ in FIG. 1, and FIG.
It is an enlarged sectional view taken along the -1 arrow. 6...Weft 17...Drum 18...Divided piece
24... Circumferential groove 25... Thread guide patent applicant Nissan Motor Co., Ltd.

Claims (1)

[Claims] After the weft yarn 6 is wound a predetermined number of times around the drum 17, which is configured using a plurality of divided pieces 18 and can be attached and adjusted to the support body 16 with gaps between each divided piece 18 and stored, the weft yarn 6 is stored. In a weft storage device for a shuttleless loom, in which one side of the drum 17 is exposed and the weft 6 is pulled out, the drum 17
A weft storage device for a shuttleless loom, comprising a yarn guide 25 made of an elastic wire wound so as to span the gap on the outer peripheral surface of one side of the loom.