JPS6024212B2 - Drum-type weft storage device for shuttleless looms - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a drum-type total yarn storage device for a cedarless loom, in which a predetermined line of yarn is wound around a drum and stored.

Conventionally, there is a drum-type striped yarn storage device of this type as shown in FIG.

92 is a tapered portion 92a provided at one end and this tapered portion 9.
The drum has a straight portion 92b continuous with the tapered portion 92a, and a first hole 92c is formed in the tapered portion 92a, and a second hole 92d is formed in the straight 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 second hole 92d at the appropriate timing, respectively.

Reference numeral 91 denotes a weft fed from a yarn feeding device, and the drum 9
By a winding guide (not shown) rotating around the outer circumference of 2,
The tapered portion 92a and the first locking body 93 are wound around the drum 92.
A predetermined amount is stored 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the first locking body 93 and the second locking body 94 is inserted into the weft when the second locking body 94 is withdrawn.
However, since the surface of the conventional drum was formed to be uniformly flat, there is a seam A in the striped yarn 91 as shown in Fig. 1, and the striped yarn 91 wound later is placed on the seam A. Since the seam A will be sandwiched between the drum 92 and the striped yarn 91 wound later, it will cause weft insertion resistance during stripe insertion, and in extreme cases, it will remain pinched.
Poor striping and thread breakage sometimes occurred.

As mentioned above, the purpose of the present invention is to prevent the seam from being pinched between the drum and the twill yarn wound afterward as much as possible to prevent weft insertion defects and yarn breakage, and to prevent unevenness on the drum surface. A portion of the striped yarn wound around the drum is lifted off the surface of the drum.

The present invention will be explained below based on an embodiment shown in FIGS. 2 to 5. In the figure, 1 is a frame of the loom, 2 is an air injection nozzle for striping, 3 is a striped thread gripper, and 4 is a guide attached to a stay 6 fixed to a support 5 of the striped thread gripper 3. Silk thread 7 guided from a weft storage device to be described later
is guided by a guide 4 and passed through a silk thread gripper 3 and an air injection nozzle 2. When the weft gripper 3 is opened during weft insertion, the air jetted from the nozzle 2 causes warp threads (not shown) to be drawn into the entrance of the warp thread. The weft is inserted into the weft.

To explain the weft 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, and the axis of the bearing 9a is aligned. It is made to coincide with the marking line of the guide 4.

The rotating shaft 1 is connected to the bearing portion 9a via a ball bearing 11.
2 is rotatably supported, and a cog belt (not shown) is wound between a cog belt pulley 13 fixed to the rear end of the rotating shaft 12 and a drive pulley (not shown) of the loom. For example, the rotating shaft 12 is rotated four times per rotation.

A drum support 16 is rotatably supported at the front end of the rotating shaft 12 via a ball bearing 15, and a drum 18 is fixed to the support 16 with bolts 17.

On the circumferential surface of the drum surface 18, there are formed a tapered part 18a whose outer diameter gradually decreases from the rear end side toward the front end side, and a straight part 18b continuous with the same diameter from the smallest tapered part. Here, the diameter of the straight part 18b is set so that the length of the silk thread 7 wound four times around it becomes the striped length per one time. In addition, a magnet 1 is placed in a part of the drum 18.
A magnet 21 having a different polarity from the supported magnet 19 is provided to hold the drum 18 in a stationary state. . Further, at least the circumferential surface of the straight portion 18b of the drum 18 is provided with a structure according to the present invention.
As shown in FIG. 5, an uneven surface 40 parallel to the rattan line of the drum 18 is formed over the entire circumference. In addition, the rotating shaft 12
A thread guide hole 22 that opens to the rear end surface is formed in the axis of the rotary shaft 12, and a pull-out hole 23 is formed on the circumferential surface of the rotating shaft 12. There is. 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. put it here,
The twill yarn 7 pulled out from the yarn supplying body (not shown) is attached to the stay 26 fixed to the bracket 9 and rotated to the rotating shaft 12.
Air injection nozzle 2 for pulling in the striped thread placed behind the mari line.
7, then through the guide hole 22 and pull-out hole 23 of the rotating shaft 12, and then through the guide hole 25 along the winding guide 24, and then through the tapered part 18 of the drum 18.
a and the straight portion 18b, and is engaged with at least one of a first locking body and a second locking body, which will be described later, and is passed through the guide 4.

Reference numerals 31 and 32 denote a first locking body and a second locking body, each of which is rotatably pivotally connected to a fixed shaft 33, and which are attached to the drum 1.
The holes 35 and 36 formed in the straight part 18b and near the boundary between the tapered part 18a and the straight part 18b of 8 are opposed to each other.
The locking body 31 and the second locking body 32 are connected to the hole 35 of the drum 18.
, 36 and exit.

Next, the action will be explained. During operation of the loom, the rotating shaft 12 rotates four times per revolution of the loom, but the drum 18 is held stationary by the attractive force between the magnet 19 attached to the drum 18 and the fixed magnet 21.

Therefore, as the rotating shaft 12 rotates, the winding guide 24
rotates around the drum 18, and the weft yarn 7 is wound around the tapered portion 18a of the drum 18. And the first locking body 31
The weft thread 7 wound around the tapered part 18a of the drum 18 is pulled out of the tapered part 18a by its own tension.
slides down, moves to the straight part 18b while pushing away the previous one, and is stored between the first locking body 31 and the second locking body 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. From this state, when the second locking body 32 exits from the hole 36 of the drum 18, the striped thread 7
The striped yarn 7 is streaked by the air injection from the nozzle 2 that starts immediately before the lock is released. When the winding amount of the straight portion 18b of the drum 18 becomes zero due to this silk insertion, the weft yarn 7 is retained by the first locking body 31, and the weft insertion is completed. The wrapping guide 24 is also used during this silk case.
rotates, so the weft yarn 7 continues to be wound between the first locking body 31 and the tapered portion 18a. Then, at the end of the creasing, the striped thread 7 is wound around the tapered part 18a side twice, but at this time, the second locking body 32 enters the hole 36 of the drum 18 again, and then the first locking body 32 enters the hole 36 of the drum 18 again. The body 31 exits through the hole 35 in the drum 18.

As a result, the twill thread 7 that has been locked to the first locking body 31 slides down the tapered part 18a and the straight part 18
b and comes to be locked by the second locking body 32.
Then, when the weft thread 7 is wound nearly four times around the straight part 18b, the first locking body 31 is placed between the silk thread part that is being wound around the tapered part 18a and the striped thread part that is wound around the straight part 18b. Rush in and separate them.

Immediately after this, all-in is performed as described above. Here, as mentioned above, the striped yarn 7 with the seam A is attached to the drum 1.
Considering the case where the striped yarn 7 is wound around the drum 18, even if the seam A is caught between the drum 18 and the subsequent striped yarn 7 when the striped yarn 7 is wound, it will be stored in the straight portion 18b. When this occurs, as shown in FIG. 5, the seam A will probabilistically face the recess between the uneven surfaces 40, so that it will almost never remain pinched as described above.

Therefore, there is no possibility of resistance during striping, resulting in poor weft insertion or thread breakage. FIG. 6 shows another embodiment.

In this embodiment, the protrusions of the previous embodiment are cut out in a staggered manner, and the cutout surfaces of the protrusions are tapered to prevent the twill thread from getting caught during full insertion. When the outer circumference 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 silk threads wound around the drum are connected to the convex stripes of the drum and other weft threads, Even if it is held between the threads, when the striping operation starts, if the threads move in the direction of the thread, they will fall into the notches and the threads will be released.

In the above embodiment, a fixed drum type striped yarn storage device was shown, but the present invention is of course applicable to a rotating drum type striped yarn storage device in which the drum is rotated.

As explained above, according to the present invention, even if there is a seam in the striped yarn, it is almost impossible to pinch the striped yarn between the drum and the striped yarn, thereby reducing resistance to striping and preventing poor striping and thread breakage. can be prevented.

Furthermore, since the contact area between the drum and the weft yarn wound around it is reduced, the opening resistance, that is, the total insertion resistance is reduced overall, and there is an advantage that the weft insertion performance can be improved.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a conventional example, FIG. 2 is a front view showing an embodiment of the present invention, FIG. Figure 5 is a perspective view of the main parts of the same as above, and Figure 6 is
The figure is a perspective view showing another embodiment. 2...Air injection nozzle, 7,91...
Twill thread, 18, 92...Drum, 93, 94, 31, 32
.... Locking body, 40, 50 .... Uneven surface, 24 ...
...Wrapping guide. Figure 3 Figure 1 Figure 4 Figure N Ship Figure 5 Figure 6

Claims (1)

[Claims] 1. A drum-type weft storage device for a shuttleless loom, in which the weft is wound a predetermined number of times around the outer peripheral surface of a drum and stored therein, the drum-type weft storage device for a shuttleless loom being characterized in that unevenness is formed on the outer peripheral surface of the drum. .