JPS5932576B2 - Weft storage device for shuttleless looms - Google Patents

Description

[Detailed description of the invention] The present invention relates to a drum-type weft storage device for a shuttleless loom.

In order to solve the problem in the process of transitioning from free flying to length measuring flying during weft insertion, the following weft storage device has been proposed by the applicant (Japanese Patent Application No. 1011-1982).
74).

That is, a rotating drum disposed between a yarn feeding means and a weft insertion means is provided with a tapered part whose diameter gradually decreases toward the weft insertion means and a straight part connected to the tapered part, and the tapered part and the straight part are connected to each other. a first locking body for locking the weft at least during the weft insertion period in relation to the loom near the boundary with the straight section; and a first locking body for locking the weft yarn at least during the weft insertion period in connection with the loom in the straight section; The weft is provided with second locking bodies, respectively, and the weft is wound around the straight portion between the first and second locking bodies for the weft insertion length before weft insertion.

According to this, since the weft yarn wound around the straight part of the drum becomes the weft insertion length, there is no process of transition from free flight to measurement flight as in the conventional method, which has the advantage of preventing problems such as yarn breakage. There is.

However, in such a conventional drum-type weft storage device, the first and second locking bodies and their driving means must be housed within the rotating drum, and the space and structure thereof are limited. Additionally, there is a problem in that timing adjustment, maintenance and inspection, etc., are extremely complicated.

The present invention was made with the aim of solving such conventional problems.The drum is held stationary, and a guide is provided for winding that rotates around the drum. is wound around the drum, and the first and second locking bodies and their driving means can be disposed outside the drum.

The present invention will be explained below based on an embodiment shown in FIGS. 1 to 4.

In the figure, 1 is the frame of the loom, 2 is the air injection nozzle for weft insertion held in the nozzle holder 3 installed upright on the frame 1, and 4 is the axis of the nozzle 2, which is attached to the stay 5 fixed to the nozzle honda 3. The weft 6 guided from the weft storage device (to be described later) is guided by the guide 4 and passed through the air injection nozzle 2. The weft is inserted into the opening of the warp (not shown) by air jetted from the weft.

To explain the weft storage device according to the present invention, a bracket 8 is fixed to the outer surface of the frame 1 with bolts 7 and arranged horizontally, and a lower end portion of the bracket 9 whose upper end portion is formed as a bearing portion 9a is attached with a bolt 10. The axis of the bearing portion 9a is made to coincide with the axis 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 toothed belt 14 is wound between a toothed pulley 13 fixed to the rear end of the rotating shaft 12 and a driving pulley (not shown) of the loom. The rotating shaft 12 is rotated in relation to the loom.

Below, the transmission ratio is 3:1, and there are 12 rotating shafts per rotation of the loom.
Assume that it rotates three times.

A holder 16 is supported at the front end of the rotating shaft 12 via a ball bearing 15 so as to be relatively rotatable, and a drum 18 is fixed to the holder 16 by bolts 17.

A weight 19 is provided in a part of the drum 18 so as to be collinear with a bolt 17, and the drum 18 is fixed with the weight 19 located at the lowest position.

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 to the minimum diameter part with the same diameter.

Here, the diameter of the straight part 18b is set so that the length of the weft thread 6 wound three times around the straight part 18b becomes the length of one weft insertion.

Note that the straight portion 18b may be slightly tapered.

For example, if the angle is about 0.5°, the weft yarn 6 can be smoothly pulled out from the drum 18 during weft insertion.

In addition, a thread guiding hole 20 is provided at the axis of the rotating shaft 12 and opens at the rear end surface.
is formed, and a pipe 21 is screwed onto the circumferential surface of the rotating shaft 12, so that the inner part of the thread guiding hole 20 and the pipe 21 are communicated with each other.

22 is a lock nut.

The guide 2 is wound around the tip of the pipe 21 and is bent obliquely so that the tip faces the tapered portion 18a of the drama 18.
3 is fixed, and a guide hole 24 is provided at the tip of the guide 23 for winding.

Here, the weft yarn 6 pulled out from the yarn supplying body 25 is attached to the stay 26 fixed to the bracket 9 and is passed through the air injection nozzle 27 for weft yarn drawing, which is arranged behind the axis of the rotating shaft 12. , the thread is passed through the guide hole 20 of the rotating shaft 12 and the pipe 21, and then wrapped around the tapered part 18a and straight part 18b of the drum 18, after being passed through the guide hole 24 along the guide 23, It is inserted into the guide 4 by being engaged with at least one of engagement levers 31 and 32, which will be described later as first and second engagement bodies.

The first and second locking bodies 31 and 32 are rotatably attached to a fixed shaft 35, and a locking portion 31a formed at the tip thereof.
, 32a are opposed to the holes 33 and 34 that are formed in the vicinity of the boundary between the tapered part 18a and the straight part 18b of the drum 18 and in the straight part 18b.

Further, swing levers 37 and 38 are rotatably attached to the fixed shaft 36, and their tips and the first and second locking bodies 31
．． It is connected to the intermediate portion of 32 via rods 39 and 40.

The fixed shafts 35 and 36 are a pair of support plates 42 fixed to studs 41 bored on the outer surface of the frame 1.
42 b.

The swing levers 37, 38 are the swing levers 37.3B.
Spring 45, 4 stretched between the fixed pin 43 and
Cam rollers 47 and 48, which are biased counterclockwise in FIG.

A rotating shaft 51 rotatably supported between the pair of support plates 42a and 42b is fixed to the cams 49 and 50, and this rotating shaft 51 is connected to a toothed pulley 52 fixed to the rotating shaft 51, which is connected to a drive pulley ( (not shown) through a toothed belt 53, and is rotated once per rotation of the loom.

The cams 49 and 50 each have a high portion 49A.

50A and low parts 49B and 50B are formed, and high parts 49A and 50A of the cams 49 and 50 and cam rollers 47 and 50B are respectively formed.
48, the swinging levers 37.38 are rotated clockwise in FIG.
into the holes 33, 34, and the lower parts 49B of the cams 49, 50.
, 50B and the cam rollers 47, 48 come into contact with each other, the locking portions 31a, 32a exit from the holes 33, 34 of the drum 18.

Next, the effect will be explained.

During operation of the loom, the rotating shaft 12 is rotated three times per revolution of the loom, but the drum 18 is held stationary without rotating due to the gravity of the weight 19.

Therefore, as the rotating shaft 12 rotates, the pipe 21 and therefore the winding guide 23 rotate around the drum 18, and the weft yarn 6 is wound around the tapered portion 18a of the drum 18.

Then, the weft 6 wound around the tapered portion 18a of the drum 18
slides down this tapered part 18a due to its own tension,
It moves to the straight part 18b while pushing away the thing in front.

In this case, the high parts 49A-250A of the cams 49, 50 are connected to the cam rollers 47, 50.
48, and the locking portions 31a, 32a of the first and second locking bodies 3L32 protrude into the holes 33, 34 of the drum 18.

In this state, the weft thread 6 is attached to the locking portion 3 of the first locking body 31.
1a and then the straight part 18b of the drum 18
After being wound three times around the second engaging 1F body 32,
It is locked on a.

When the loom rotates from this state, the high part 49A of the cam 49
The lower part 50B of the cam 50 and the cam roller 47 continue to contact each other, but the lower part 50B of the cam 50 and the cam roller 48 come into contact with each other, so that the locking part 32a of the second locking body 32 is in contact with the hole 3 of the drum 18.
4, the lock on the weft thread 6 is released, and the air injection from the nozzle 2 that starts immediately before this releases the weft thread 6.
is inserted into the weft.

When the winding amount of the straight portion 18b of the drum 18 reaches O due to this weft insertion, the weft yarn 6 is locked to the locking portion 31a of the first locking body 31, and the weft insertion is completed. Since the guide 23 rotates approximately once, the first locking body 31
The weft 6 is located closer to the tapered portion 18a than the locking portion 31a.
wrapped around.

Immediately after this, first, the high part 50A of the cam 50 and the cam roller 4
8 come into contact with each other, the locking part 32a of the second locking body 32 again enters the hole 34 of the drum 1B, and then the lower part 49B of the cam 49 and the cam roller 47 come into contact with each other. The locking portion 31a of the first locking lever 31 is connected to the drum 1.
Exit through hole 33 at No.8.

Then, the weft thread 6 wound around the tapered part 18a slides down and moves to the straight part 18b, and the second locking body 32
It comes to be locked by the locking part 32a of.

When the weft yarn 6 is wound around the straight portion 18b nearly three times, the high portion 49A of the cam 49 and the cam roller 47 come into contact with each other, so that the locking portion 31a of the first locking body 31 is wound around the tapered portion 18a. Weft part that is becoming curly 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.

Note that the weft thread drawing nozzle 27 is provided to reduce the drawing resistance, and is not necessarily necessary.

When the nozzle 27 is not provided, the wire is inserted into the thread guide hole 20.
Then, the pipe 21 is inserted, and the weft thread is hooked to the tip of the pipe 21 and pulled through.

In addition, when the weft yarn is unwound during weft insertion, if there is a concern that the weft yarn may get caught on the second engaging IF section 32a due to ballooning, a guide for regulating ballooning is installed around the drum 18 to prevent the weft from getting caught. It is good to have a

Furthermore, as a means for fixing the drum 18, a weight 19 is used.
Alternatively, the drum may be prevented from rotating by placing a magnet from outside the drum against an iron piece or magnet provided inside the drum.

In addition, although the holes 33 and 34 are formed as penetrating holes, they may also be hollow holes.

As explained above, according to the present invention, since the drum itself does not rotate, it is possible to arrange the locking body etc. outside the drum, and timing adjustment, maintenance and inspection, etc. are also facilitated.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is a front view, FIG. 2 is a front vertical sectional view, FIG. 3 is a plan view, and FIG. 4 is a right side view. 6... Weft, 12... Rotation shaft, 18.
...Drum, 18a... Taper part, 18
b... Straight part, 19... Weight,
23... Winding guide, 25... Yarn feeder, 31... First locking body, 32...
Second locking body, 33, 34... hole.

Claims (1)

[Claims] 1. In a weft storage device for a shuttleless loom, in which the weft is wound around the drum from the yarn feeding means and stored between the first and second locking bodies, the drum is held stationary and rotated around the drum. A guide is provided for winding, and the guide winds the weft yarn from the yarn feeding means around the drum.
and a weft storage device for a shuttleless loom, characterized in that a second locking body is disposed outside the drum and is caused to enter and exit a hole formed on the circumferential surface of the drum at a predetermined timing.