JPH0144815B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a fluid jetting method in which a weft yarn is wound a predetermined number of times around the outer circumferential surface of a drum that forms a straight portion connected to a tapered portion, and the length of the weft yarn is stored. This invention relates to a drum type weft length measuring and storage device for a type loom.

<Prior art> In a fluid jet loom, the weft insertion length for one weft insertion cannot be regulated by the weft insertion means.
It must be done by other means.
Therefore, a drum-type weft length measuring and storage device as shown in Fig. 6 has been proposed by the present applicant (patent application
55-86497).

In FIG. 6, 92 is a drum having a tapered part 92a provided at one end and a straight part 92b continuous with the tapered part 92a. A second hole 92d is formed in the portion 92b. Reference numerals 93 and 94 denote a first locking body and a second locking body that enter and exit the first hole 92c and the second hole 92d at appropriate timings, respectively. 9
1 is a weft yarn supplied from a yarn feeding device, and a winding guide (not shown) rotates around the outer periphery of the drum 92.
As a result, it is wound around the drum 92 and stored in a predetermined amount between the tapered portion 92a and the first locking body 93 and between the first locking body 93 and the second locking body 94. The yarn stored between the first locking body 93 and the second locking body 94 is inserted into the weft when the second locking body 94 is withdrawn.

<Problems to be Solved by the Invention> However, since the surface of the drum of such a weft length measuring and storage device was formed to be uniformly smooth, there was a seam A in the weft yarn 91 as shown in FIG.
When the later-wound weft yarn 91 rides on the seam A, the seam A will be sandwiched between the drum 92 and the later-wound weft yarn 91, resulting in weft insertion resistance and extreme In some cases, the yarn remained pinched, resulting in poor weft insertion and thread breakage.

In view of these problems, the present invention has been developed to
To suitably regulate the weft insertion length of each batch, and prevent a weft joint from being caught between a drum and a later wound weft as much as possible to prevent defective weft insertion or yarn breakage due to this. An object of the present invention is to provide a drum-type weft length measurement and storage device that can perform the following functions.

<Means for Solving the Problems> For this reason, the present invention has the drum supported by a rotating shaft and held stationary, and the weft yarn is rotated by rotating the guide hole of the winding guide attached to the rotating shaft. is wrapped around the tapered part of the outer circumferential surface of the drum, and the locking section divides the storage length necessary for one weft insertion by moving in and out of the tapered part of the outer circumferential surface of the drum at a predetermined position at a predetermined timing on the outside of the drum. While the body is disposed, irregularities are formed on the outer circumferential surface of the drum.

<Function> According to this, the weft yarns necessary for one weft insertion can be divided and measured and stored by the locking body. and,
Since the locking body is on the outside of the drum, it is easy to adjust the timing of loading and unloading. Further, since the locking body is disposed outside the drum in this manner, the drum is provided in a stationary state.

Furthermore, the outer circumferential surface of the drum is formed with unevenness so that a part of the wound weft yarn is lifted off the outer circumferential surface of the drum, and the seam part may be located in a recessed part, so there is a gap between the drum and the weft yarn. This reduces the chance of the weft being pinched by the drum, thereby preventing weft insertion errors and yarn breakage as much as possible.The concave portion also reduces the contact area between the drum and the weft thread wound on it, which resists unwinding of the weft thread, thereby preventing weft insertion. Resistance is generally reduced, and weft insertion can be ensured.

<Example> The present invention will be described below based on an example shown in FIGS. 1 to 4.

In the figure, 1 is a frame of the loom, 2 is an air injection nozzle for weft insertion, 3 is a weft gripper, and 4 is a guide attached to a stay 6 fixed to a support 5 of the weft gripper 3, which will be described later. The weft yarn 7 guided from the weft length measuring and storage device is guided by a guide 4 and passed through a weft gripper 3 and an air injection nozzle 2. When the weft gripper 3 is released during weft insertion, the weft yarn is jetted from the nozzle 2. The weft is inserted into the opening of the warp (not shown) by the air generated by the weft.

To explain the weft length measuring and storage device, the lower end of a bracket 9 whose upper end is formed as a bearing 9a is fixed to a horizontally arranged bracket 8 fixed to the outer surface of the frame 1, The axis 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 cog belt pulley 1 fixed to the rear end of the rotary shaft 12
A cog belt (not shown) is wound between the loom 3 and a drive pulley (not shown) of the loom, so that the rotating shaft 12 is rotated, for example, four times per rotation of the loom main shaft.

A ball bearing 15 is installed at the front end of the rotating shaft 12.
A drum support 16 is rotatably supported via the drum support 16, and a drum 18 is fixed to this support 16 with bolts 17. The circumferential surface of the drum 18 is formed with a tapered part 18a whose outer diameter gradually decreases from the rear end side to the front end side, and a straight part 18b continuous with the same diameter at the minimum diameter part. here,
The straight part 18b is wound so that the length of the weft 7 wound four times is the weft insertion length for one weft insertion.
Its diameter is set. Further, a magnet 19 is attached to a part of the drum 18, and this magnet 1
A magnet 2 having a different polarity from the magnet 19 supported on a support 20 erected on the bracket 8 opposite to the magnet 19.
1 is provided to hold the drum 18 stationary. Furthermore, as shown in FIG.
A concavo-convex surface 40 parallel to the axis of 8 is formed over the entire circumference.

Further, a thread guiding hole 22 that opens to the rear end surface is formed in the axis of the rotating shaft 12, and a pull-out hole 23 is formed in the circumferential surface of the rotating shaft 12. It is in communication with. A winding guide 24 whose tip end is obliquely bent and extends to the tapered part 18a of the drum 18 is fixed to the circumferential surface of the rotary shaft 12 in front of the pull-out hole 23. A guide hole 25 is provided.

Here, the weft yarn 7 pulled out from the yarn supplying body (not shown) is attached to the stay 26 fixed to the bracket 9 and sent to an air injection nozzle 27 for drawing the weft yarn disposed behind the axis of the rotating shaft 12. After pulling the thread through, the thread guide hole 22 and the pull-out hole 23 of the rotating shaft 12 are inserted.
, and then passed through the guide hole 25 along the winding guide 24, and then wound around the tapered part 18a and the straight part 18b of the drum 18 to form a first locking body and a second locking body, which will be described later. The guide 4 is threaded through the guide 4 by being engaged with at least one of the two.

31 and 32 are a first locking body and a second locking body, each of which is rotatably pivoted to a fixed shaft 33;
They are near the boundary between the tapered part 18a and the straight part 18b of the drum 18, and the straight part 18b.
The first locking bodies 31 are opposed to the holes 35 and 36 drilled in the
and the second locking body 32 is connected to the holes 35, 3 of the drum 18.
It is designed to enter and exit at 6.

Next, the effect will be explained.

During operation of the loom, the rotary shaft 12 rotates four times per revolution of the main shaft of the loom, but the drum 18 is held stationary by the attractive force between the magnet 19 attached thereto and the fixed magnet 21. Therefore, the rotating shaft 12
As the winding guide 24 rotates, the winding guide 24 wraps around the drum 18.
The weft yarn 7 is wound around the tapered portion 18a of the drum 18. And the first locking body 31
By withdrawing the tapered portion 1 of the drum 18
The weft yarn 7 wound around the weft yarn 8a slides down the tapered portion 18a due to its own tension, moves to the straight portion 18b while pushing away the previous one, and is attached to the first locking body 3.
It is stored between the first and second locking bodies 32.

Taking the point immediately before weft insertion as a starting point, the first locking body 31 and the second locking body 32 have entered the holes 35 and 36 of the drum 18 at this time. In this state, the weft yarn 7 is locked by the first locking body 31, wound four times around the straight portion 18b of the drum 18, and then locked by the second locking body 32.

When the second locking body 32 exits from the hole 36 of the drum 18 from this state, the lock on the weft yarn 7 is released, and the weft yarn 7 is inserted by the air injection from the nozzle 2 that starts immediately before this. Ru. When the winding amount of the straight portion 18b of the drum 18 becomes 0 as a result of this weft insertion, the weft yarn 7 is retained by the first retaining body 31 and the weft insertion is completed. Note that since the winding guide 24 rotates during this weft insertion, the first locking body 31
The weft 7 continues to be wound between the tapered portion 18a and the tapered portion 18a.

Then, at the end of the reed beating, the weft 7 is wound around twice on the tapered part 18a side, but at this time, first the second
The locking body 32 again enters the hole 36 of the drum 18,
The first locking body 31 then exits from the hole 35 of the drum 18. As a result, the weft yarn 7, which has been locked by the first locking body 31, slides down the tapered portion 18a, is located on the straight portion 18b, and is locked by the second locking body 32.

Then, when the weft yarn 7 is wrapped around the straight portion 18b nearly four times, the first locking body 31 is attached to the tapered portion 18b.
Weft part being wound around 8a and straight part 1
It enters between the weft yarn portion wound around 8b and separates them. Immediately after this, weft insertion is performed as described above.

Here, as mentioned above, weft thread 7 with seam A
is wound around the drum 18, when the weft yarn 7 is wound, the seam A is wrapped around the drum 18.
Even if the seam A is sandwiched between the weft yarn 7 and the later weft yarn 7, when the seam A is stored in the straight portion 18b, the seam A is stochastically relative to the concave portion between the uneven surfaces 40 as shown in FIG. Therefore, it is almost impossible to remain stuck as described above.
Therefore, weft insertion resistance during weft insertion, resulting in poor weft insertion or thread breakage, is eliminated.

FIG. 5 shows another embodiment. In this embodiment, the protruding stripes of the previous embodiment are cut out in a staggered manner to form an uneven surface 50, and the cutout surfaces of the protruding stripes are tapered to prevent the weft from getting caught during weft insertion. be.

When the outer periphery of the drum is formed in a staggered manner in this way, in addition to the effect of the drum having the outer circumferential surface of convex stripes, even if the seams of the weft threads wound around the drum are connected to the convex stripes of the drum and other weft threads, Even if the weft is caught between the wefts and the weft, when the weft insertion operation starts, if the weft moves in the axial direction, it will fall into the notch and be released.

<Effects of the Invention> As explained above, according to the present invention, the storage length required for one weft insertion can be divided and stored by moving the locking body in and out. This makes it easy to adjust the timing of entry and exit. Further, even if there is a seam in the weft yarn, it is almost impossible to pinch the weft yarn between the drum and the weft yarn, thereby reducing weft insertion resistance and preventing weft insertion defects and yarn breakage as much as possible. Furthermore, by eliminating the contact area between the drum and the weft wound around it,
There is also the advantage that the unwinding resistance, that is, the weft insertion resistance is generally reduced, and the weft insertion performance can be improved.

[Brief explanation of drawings]

FIG. 1 is a side view of essential parts showing one embodiment of the present invention;
Fig. 2 is a front view of the same as above, Fig. 3 is a vertical sectional view of the main part of the same as above, Fig. 4 is a perspective view of main part of same as above, Fig. 5 is a perspective view showing another embodiment, and Fig. 6 is a preceding example. FIG. 2 is a perspective view showing the technique. 2... Air injection nozzle, 7... Weft, 12...
Rotating shaft, 18...drum, 18a...tapered part,
18b... Straight part, 19, 21... Magnet,
24... Winding guide, 25... Guide hole, 31
...First locking body, 32...Second locking body, 40,5
0...Uneven surface.

Claims (1)

[Claims] 1 Straight portion 18 connected to tapered portion 18a
In a drum-type weft length measurement and storage device for a fluid jet loom, in which the weft 7 is wound a predetermined number of times around the outer circumferential surface of a drum 18 on which the drum 18 is formed, and its length is stored, the drum 18 is supported on the rotating shaft 12 and By keeping the weft 7 stationary and rotating the guide hole 25 of the winding guide 24 attached to the rotating shaft 12, the weft yarn 7 is moved to the tapered portion 18 on the outer peripheral surface of the drum 18.
tapered portion 18 on the outer peripheral surface of the drum 18 at a predetermined timing.
The locking bodies 31, 3 divide the storage length required for one weft insertion by moving in and out of the predetermined position of b.
2, and unevenness 40, 50 are formed on the outer peripheral surface of the drum 18.