JPS6241986Y2 - - Google Patents

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 around a drum and stored.

Conventionally, in shuttleless looms, a method is known in which the weft is wound around a drum and stored while being inserted.
For example, JP-A-57-16946.

However, since the peripheral surface of conventional drums was formed uniformly and smoothly, if there was a seam in the weft yarn and the yarn end was exposed, the weft wound next to the seam would step on the yarn end. Sometimes it gets stuck. For this reason, when the roll including the seam is unwound, it becomes a resistance, and the unwinding is not performed smoothly, resulting in a weft insertion failure.

Furthermore, when using a weft yarn with a lot of fluff, such as a spun yarn, the weft yarn wound later rides on the fluff, resulting in poor weft insertion.

In addition, since conventional drums were made of metal and made of solid material, the tension of the weft yarn increased rapidly, especially at the end of weft insertion, resulting in the occurrence of weft yarn breakage.

Furthermore, as described in Japanese Patent Publication No. 43-3541, there is a structure in which the member for winding the weft is made up of a plurality of rod-shaped bodies and is held in a cantilevered state; Because it is held in a holding state, when the rod-like body is displaced by the tension of the weft being wound when the weft is being wound, the weft pull-out side will be displaced more, so the rod-like body will not be able to move forward to the weft pull-out side after it has already been wound. This causes the weft threads to loosen, fall off, or cause a so-called running-up phenomenon, resulting in poor weft insertion.

The purpose of this invention is to prevent poor weft insertion by preventing the thread end or fuzz at the joint from becoming pinched between the drum and the weft wound later, as described above, to prevent the weft from breaking due to a sudden rise in weft tension at the end of weft insertion, and to prevent unnecessary slack in the wound weft.A number of rod-shaped bodies are arranged circumferentially on the peripheral surface of the drum, each of which is raised above the peripheral surface of the drum and approximately parallel to the drum axis, with one end of each rod-shaped body held in a cantilevered state on the weft pull-out side of the drum, and the weft is wound around these rod-shaped bodies so that the weft is partially in contact with the wound portion.Furthermore, the rod-shaped bodies bend at the end of weft insertion to mitigate the sudden rise in weft tension, and the amount of displacement of the rod-shaped bodies on the weft pull-out side is reduced compared to the weft winding side, thereby preventing unnecessary slack in the weft.

The present invention will be explained below based on an embodiment shown in FIGS. 1 to 3.

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. The guide 4 is a guide arranged at the rear (left side in the figure), and the weft 6 guided from the weft storage device, which will be described later, is a guide 4.
The weft is inserted into a warp opening (not shown) by the air jetted from the nozzle 2 during weft insertion.

To explain the weft storage device, frame 1
to the bracket 8 fixed with bolt 7 to the outer surface of
Bracket 9 whose upper end is formed as a bearing portion 9a
The lower end portion of the guide 4 is fixed with a bolt 10, and the axis of the bearing portion 9a is aligned with the axis of the guide 4. A rotary shaft 12 is rotatably supported by the bearing portion 9a via a ball bearing (not shown), and a toothed pulley 13 fixed to the rotary shaft 12 and a drive pulley (not shown) of the loom are connected to each other. A toothed belt 14 is wound between them so that the rotary shaft 12 is rotated in relation to the loom. Below, the transmission ratio is 3:1
Assume that the rotating shaft 12 rotates three times for each rotation of the loom.

A drum support 16 is supported at the front end of the rotating shaft 12 via a ball bearing (not shown) so as to be relatively rotatable.
7 is installed. This drum 17 consists of three divided pieces 18, each divided piece 18 has a long hole 19 formed long in the radial direction, and a screw 20 inserted through the long hole 19 is screwed onto the drum support 16. As a result, each divided piece 18 is guided to move in the radial direction, and its fixing position can be adjusted, thereby making the drum diameter variable. 21 is the drum support 16
A long guide hole 22 formed in is a guide pin inserted into the long hole 21 provided in each divided piece 18. Then, each divided piece 1 is attached to the drum 17.
On the circumferential surface of 8, from the rear end side to the front end side,
A tapered part 17a whose outer diameter gradually decreases, and a straight part 17b continuous with the same diameter at the minimum diameter part are formed, and the length of the weft 6 wound about three times around the straight part 17b is equal to the length of one weft. It becomes long.

A magnet 23 is fixed inside one divided piece 18 of the drum 17, and the magnet 23 is supported by a support 24 provided upright on the bracket 8.
5 are opposed to the drum 17 from outside, and the drum 17 is held stationary.

Further, a first hole 34 and a second hole 35 are formed on the circumferential surface of one divided piece 18 of the drum 17 near the boundary between the tapered portion 17a and the straight portion 17b and on the front end side of the straight portion 17b. .

As a configuration according to the present invention, a plurality of slits 58a are formed in the tapered portion 17a of each divided piece 18 of the drum 17. In addition, each divided piece 18
The slit 5 is provided at the tip of the straight portion 17b.
A hole 58b corresponding to the hole 8a is formed, and one end of a rod-shaped body 40 bent into an L-shape is embedded with resin 59 in the hole 58b. Furthermore, the rod-shaped body 4
0 is disposed substantially parallel to the axis of the drum 17, and the other end is inserted into the slit 58a and becomes a free end.

On the other hand, a thread guiding hole (not shown) that opens at the rear end surface is formed in the axis of the rotating shaft 12.
A pull-out hole 27 communicating with the thread guide hole is provided on the circumferential surface of the thread guide hole 2 . The front end of the rotating shaft 12 is bent obliquely on the circumferential surface of the drum 1 in front of the extraction hole 27.
Winding guide 29 facing the tapered portion 17a of No. 7
is fixed, and a guide hole 30 is provided at the tip of this winding guide 29.

Here, the weft yarn 6 pulled out from the yarn supplying body (not shown) is inserted into the yarn guide hole of the rotating shaft 12 and the pull-out hole 27.
Then, after passing it through the guide hole 30 along the winding guide 29, it is wound around the tapered part 17a and the straight part 17b of the drum 17 (on the rod-shaped body 40 in the straight part 17b). It is locked by at least one of the first locking body 31 and the second locking body 32, and is passed through the guide 4.

The first locking body 31 and the second locking body 32 are connected to the fixed shaft 3
3, and locking portions 31a and 32a formed at their tips face the first hole 34 and second hole 35, and are rotated at appropriate times to push in or out. I'm starting to leave.

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 23 attached to the drum 17 and the fixed magnet 25. Therefore, as the rotating shaft 12 rotates, the winding guide 29 rotates around the drum 17, and the weft yarn 6 is wound around the tapered portion 17a of the drum 17. The weft thread 6 wound around the tapered part 17a of the drum 17 is moved by its own tension to the tapered part 17a.
a and move to the straight section 17b while pushing away the objects in front.

If the starting point is just before weft insertion, the first locking body 31 and the second locking body 32 have entered the holes 34 and 35 of the drum 17 at this time. In this state, the weft yarn 6 is locked by the first locking body 31, wound around the straight portion 17b of the drum 17 three times, and then locked by the second locking body 32.

When the loom rotates from this state, the second locking body 3
2 exits from the hole 35 of the drum 17, the lock on the weft yarn 6 is released, and the weft yarn 6 is inserted by the air injection from the nozzle 2 that starts immediately before this. When the winding amount of the straight portion 17b of the drum 17 becomes 0 due to this weft insertion, the weft yarn 6 is locked to the first locking body 31 and the weft insertion is completed. Since it rotates, the first
The weft thread 6 is wound approximately one turn closer to the tapered portion 17a than the locking body 31.

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

Then, when the weft yarn 6 is wound around the straight portion 17b nearly three times, the first locking body 31 is moved around the tapered portion 17b.
Weft part being wound around 7a and straight part 1
It enters between the weft yarn portion wound around 7b and separates them. Immediately after this, weft insertion is performed as described above.

Here, considering the case where the weft yarn 6 with the yarn end of the seam 6a and the fluff is wound around the drum 17 as described above, when the weft yarn 6 is wound, the yarn end of the seam 6a and the fluff are wrapped around the taper of the drum 17. Part 17a
When the weft yarn 6 is wound onto the straight portion 17b and then the wound portion of the weft yarn 6 slips down and is stored in the straight portion 17b even if it touches the yarn end, the probability is that the weft yarns 6 are adjacent to each other. Rod-shaped body 4
Since the drum 17 is stored without contacting the peripheral surface of the drum 17, it is almost impossible for the drum 17 to remain trapped as described above. Therefore, the unwinding of the weft yarn 6 during weft insertion is smooth, and there is no possibility of defective weft insertion or yarn breakage. moreover,
Since the rod-shaped body 40 is fixed on the position-adjustable divided piece 18, when changing the storage length, the divided piece 18 can be moved without moving the rod-shaped body 40, so that the storage length can be easily adjusted. .

In addition, since the other end of the rod-like body 40 is a free end and has sufficient elasticity, even if the tension of the weft yarn 6 suddenly increases at the end of weft insertion, the rod-like body 40 bends and alleviates the increase in weft tension, thereby preventing weft breakage. prevent.

Furthermore, since the rod-like body 40 is held in a cantilevered state on the front end side of the drum 17, that is, on the weft pull-out side, and has a free end on the weft winding side, the rod-like body 40 is displaced by winding the weft yarn 6. Even so, the amount of displacement of the rod-like body 40 on the weft drawing side is extremely small, and it is possible to prevent the already wound weft 6 from becoming loose.

In the above-described embodiments, a fixed drum type weft storage device has been described, but it goes without saying that the present invention can also be applied to a rotating drum type weft storage device in which the drum is rotated. Further, the number of locking bodies may be two as in the embodiment, or one.

As explained above, according to the present invention, even if the weft has a joint or fuzz, it is hardly caught between the drum and the weft, and the unwinding resistance during weft insertion is reduced, thereby preventing poor weft insertion and weft breakage as much as possible. In addition, the contact area with the weft wound on the drum is reduced, which reduces the overall unwinding resistance, and further reduces the sudden rise in weft tension at the end of weft insertion, preventing weft breakage, and improving weft insertion performance. Furthermore, since the rod-shaped body is held in a cantilevered state on the weft pull-out side of the drum, the slack in the weft already wound can be reduced, and the effect of preventing a sudden rise in weft tension at the end of weft insertion can be further improved.

[Brief explanation of the drawing]

Figure 1 is a front view showing one embodiment of the present invention;
The figure is a side view of the main parts of the same as above, and Figure 3 is the - of Figure 2.
FIG. 6... Weft, 17... Drum, 29... Winding guide, 31... First locking body, 32... Second locking body, 40
...rod-shaped body.

Claims (1)

[Scope of utility model registration request] In a weft storage device for a shuttleless loom, in which the weft yarn 6 is wound around a drum 17 and stored therein, a plurality of rod-shaped bodies 40 are floated from the peripheral surface of the drum 17, respectively, and are connected to the axis of the drum 17. The rod-like bodies 40 are arranged in a row in the circumferential direction so as to be substantially parallel and one end of each rod-like body 40 is held in a cantilever state on the weft drawer side of the drum 17, and the weft yarn 6 is wound on these rod-like bodies 40. A drum-type weft storage device for shuttleless looms.