JPS62117854A - Weft yarn pull-back method in fluid jet 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 Field of Industrial Application The present invention relates to a fluid jet Q" type loom, in which after inserting the weft,
This invention relates to a method for pulling back the weft yarn end cut by a cutter between the weft insertion nozzle and the yarn feeding side weaving end to the weft insertion nozzle side.

Conventional technology In a fluid jet loom that performs weft insertion using water jets or air jets, after weft insertion is completed, when the weft is cut at the tip of the weft insertion nozzle in preparation for the next weft insertion, the weft insertion nozzle If the weft remains at the tip of the
The end of this remaining weft thread may come into contact with the warp thread or the weft thread that is in shedding motion, or in the case of multicolor weft inserting, the weft thread at the tip of another weft inserting nozzle installed in parallel. As a result, the next weft insertion may be hindered as the fibers split or become tangled with them.

Conventionally proposed weft pulling back means to solve the weft insertion troubles caused by this cause include, for example, weft gripping means in the middle of the weft supply path consisting of a weft storage device, a weft gripper, and a weft insertion nozzle. A swinging lever for bending the weft thread is interposed between the container and the weft insertion nozzle, and after weft insertion is completed and the weft thread is cut, the swinging lever is raised to bend the weft thread. Therefore, there is a method that pulls back the weft (Japanese Patent Application Laid-Open No. 59-216950,
(Japanese Patent Application Laid-open No. 60-17150).

However, in such a weft yarn pull-back means, the weft yarn is inserted through a yarn guide provided on a swing lever, and each time the weft yarn is pulled back, the weft yarn is squeezed by the yarn guide and bent greatly, so there is a risk of fuzzing. Yarn guides have a negative effect on weft threads that fly in a balloon pattern, and the number of types of weft threads is limited in the narrow space between the weft gripper and the weft inserting nozzle, especially in the case of multi-colored weft inserting. However, since it is necessary to incorporate a swing lever and a mechanical element for driving the swing lever, problems such as a complicated structure are unavoidable.

Purpose of the Invention In view of the problems of the prior art, an object of the present invention is to utilize a locking pin of a drum-type weft storage device and move the locking pin in a direction opposite to the weft payout direction to pull back the weft. Therefore, in order to move the locking pin, it is only necessary to slightly modify the locking pin drive mechanism that has been installed in the past, so there is no need to add any complicated mechanism, and moreover, there is no need to add any complicated mechanism. It is an object of the present invention to provide a method for pulling back a weft yarn in a fluid jet loom, which does not cause the weft yarn to be bent by a yarn guide, so there is no risk of adversely affecting the weft yarn.

Structure of the Invention The structure of the present invention for achieving the above object is to move relative to the drum around which the weft is wound and stored.
At least immediately after cutting the weft after reeding, move the locking pin of the drum-type weft storage device that controls the weft payout timing in the opposite direction to the weft payout direction while keeping the weft locked. By moving the weft thread and pulling back the weft thread at the tip of the weft insertion nozzle, the weft thread pull-back operation is applied to the locking pin that controls the weft thread locking and unwinding in order to control the weft thread payout timing. The gist is that there is no need to additionally introduce a yarn guide for bending the weft and its drive mechanism into the weft path.

Example Examples will be described below with reference to the drawings.

The weft W is wound around (pulled and stored in) a drum-type weft storage device 10, and then passed through a yarn guide 1 and inserted into an opening S formed by the warp threads W, W, etc. by a weft insertion nozzle 2. After being bruised with a saw (not shown), it is cut by a cutter 3 (FIG. 1).

The weft storage g position 10 is indicated by the arrow X in the figure in the weft W payout direction.
A fixed drum 11 consisting of a flange 11a having a conical surface inclined in a direction> and a cylindrical portion 11b continuous with the flange 11a, and a hollow winding arm 12 for winding the weft W on the inner weft surface of the flange 11a. and locks it to the weft W wound around the collar 11a of the fixed drum 1, or
A locking pin 13 for unwinding is provided. That is, the weft W is inserted into the hollow interior of the winding arm 12, is swung from behind the collar 11a by the winding arm 12 rotating in the direction of arrow Z in the figure, and is wound around the collar 11a. The timing of its feeding is controlled by a locking pin that moves back and forth in the Y direction in the figure so that the tip is inserted into and removed from an elongated hole 11C provided on the conical surface of the portion 11a. At the start of weft insertion, the locking pin 13 moves in its forward direction, that is, in the direction in which the weft W is fed out, and when its tip completely escapes from the elongated hole 11C, the weft W wound around the collar 11a is released. The cylindrical part 11 slides down on the conical surface.
b, and is unwound by the weft insertion nozzle 2, but the locking pin 13 moves back and its tip is inserted into the elongated hole 11C.
When the weft thread is sunk inward, the weft thread W wound around the flange portion 11a is locked and the weft insertion is completed.

The yarn guide 1 inserts the weft W and regulates its position on the axis of the weft insertion nozzle 2.

The weft insertion nozzle 2 is used to create an air jet or water jet for weft thread flight using an air source or a pressure water source (not shown), and the weft thread W is inserted into the opening S by these jets. After the inserted weft yarn W is beaten, the cutter 3 operates to cut the weft yarn W near the edge of the woven fabric. The cut end of the weft yarn W remains at the tip of the weft insertion nozzle 2 with a length determined by the distance between the tip of the weft insertion nozzle 2 and the cutter 3, and assumes a free posture there.

An example of a drive mechanism for the locking pin 13 of the weft storage device 10 is shown in FIG.

The locking pin 13 is a thin rod whose tip is bent at a right angle, and is fixed to a rotation shaft 23, which is indicated schematically by the center line, via brackets 21 and 22.

A swing dog 24 is fitted on the rotation shaft 23, and this dog is connected to a disk cam 28 by a compression spring 25, which will be described later.
It is always energized in the direction of .

A cam follower 24b is pivotally attached to the tip of the swing dog 24 via a shaft 24a. On the other hand, a disk cam 28 and a belt pulley 27 are fitted onto the drive shaft 26, which is schematically indicated by the center line, and the operating surface 28a of the former is constantly in contact with the cam follower 24b by the compression spring 25.
A timing belt 27a is passed around the belt pulley 27, and power is transmitted from a main drive shaft of a loom (not shown).

When the loom is operated, the disc cam 28 is rotated via the timing belt 27a, the belt sheave 27, and the drive shaft 26, so that the cam follower 24b that is in contact with the operating surface 28a moves along the unevenness provided on the operating surface 28a. Therefore, the swinging dog 24 swings according to this cam curve (in the direction of arrow Y1 in FIG. 2). As a result, the rotation shaft 23 rotates, so the locking pin 13
(also rotates left and right in the direction of arrow Y in the same figure), which is the first
This results in a back-and-forth motion as indicated by arrow Y in the figure.

However, since the rotation range of the locking pin 13 is not large, the back-and-forth movement of the tip thereof can be substantially regarded as a linear movement along the generatrix direction of the cylindrical portion 11b of the drum 11.

In this way, the back-and-forth movement of the locking pin 13 determined by the cam curve of the operating surface 28a of the disc cam 28 is as shown in FIG. 3(a).
The curve is defined as follows. In other words, when the horizontal axis is the rotation angle of the loom, with the time of beating being 0 degrees and the time of the most retracted position of the blade being 180 degrees, and the vertical axis being the amount of back and forth movement of the locking pin 13, The locking pin 13 starts moving forward in the weft W payout direction at a rotation angle of 80 degrees and reaches point F in the figure, hereinafter:
(simply denoted as (F)), and at 901i when weft insertion begins, its tip comes off the conical surface of the flange 11a (A),
Since the weft W, which is wrapped around the conical surface with a length of one pick, is released, the weft W moves onto the cylindrical part 11b, is unwound by the weft insertion nozzle 2, and is unwound. An entry is made. The locking pin 13 reaches its forward end at 120 degrees (E3), and then begins to move backward, and at 150 degrees, the weft W
(C), but at this time, all of the weft yarns W for one pick have already slipped onto the circumferential surface of the cylindrical portion 11b. On the other hand, since the winding arm 12 continuously winds the weft W on the conical surface of the flange 11a, the weft W wound on the conical surface from now on will be used for the next weft insertion operation. becomes. The winding operation of the weft W at this time is approximately When the weft insertion was completed at 230 degrees, the rear end of the weft W, which was flying due to the weft insertion, was stopped by the locking pin 13, and the weft was stretched to the full width of the woven fabric and stopped. The impact at this time is effectively absorbed by the part of the weft W that is loosely wound and stored on the conical surface, and it is possible to effectively prevent the occurrence of yarn breakage of the inserted weft W.

On the other hand, once the locking pin 13 has retreated enough to lock the weft W, it temporarily stops (D>), but immediately after weft insertion is completed, it starts moving back again (E).

The backward movement of the locking pin 13 after point E is performed while the rear end of the inserted weft W is locked, so a force in the pullback direction is applied to the weft W. , helps to tension the inserted weft yarn W. Therefore, it is possible to prevent so-called weft loosening defects from occurring on the woven fabric.

Thereafter, after bruising is performed at 0 degrees, the weft W is cut by the cutter 3 at 20 degrees, and the lock pin 13 continues to move forward until it reaches 80 degrees (F). 1
3, the end of the weft W left at the tip of the weft insertion nozzle 2 is almost completely pulled back into the nozzle 2. The backward movement of the locking pin 13 from point E to point F is in the direction of pushing back the weft W wound on the conical surface of the flange 11a against the inclination of the conical surface, and as a result, Since the wound weft W is inclined diagonally on the conical surface (Fig. 1), the retraction distance d of the locking pin 13 after cutting the weft in order to realize the required pullback length of the weft W is as follows. , an extremely small amount is sufficient.

For comparison, the curve (b) in FIG. 3 shows a conventional motion curve of the locking pin 13 that does not involve pulling back the weft W. Comparing the curves (a>, (b), D
The only difference is that a backward commuting stroke of the locking pin 13 from point E to point F is added during the stroke from point E to point F, and in order to realize this, the conventional disc cam 28 It is sufficient to change the cam curve of the operating surface 28a to suit this purpose.

Note that, of course, if it is not necessary to tension the inserted weft yarn W before cutting the weft yarn, it is possible to delay the point E until immediately after cutting the weft yarn.

In general, it goes without saying that the present invention includes a cylindrical drum 14 having no flange 11a, and a long hole 1 provided on the circumferential surface of the cylindrical drum 14.
The present invention can also be applied to a drum-type weft storage device 10 having a locking pin 13 that is driven in the radial direction of the drum 14 so that the tip can be inserted into and removed from the drum 4a (FIG. 4). That is, the tip of the locking pin 13 is inserted into the elongated hole 14a, and the weft W which has been wound and stored on the circumferential surface of the drum 14 is locked. pin 13
If the weft yarn W is moved and retreated in the opposite direction to the weft direction (arrow X direction in the figure) ((C) in FIG. 5), the inserted weft yarn W is tensioned and pulled back in exactly the same way as described above. It is possible to realize this. Here, (A> or D> in FIG. 5 indicates the order of movement of the locking pin 13 to perform a series of operations corresponding to the curve (a) in FIG.
Figure (B) shows the process of backward movement from point E to point F, and <C> in the same figure shows the process of backward movement from point E to point F.
It shows each state corresponding to the process of return at a point. In this case, as a drive mechanism for the locking pin 13, in addition to the conventional mechanism for inserting and removing the locking pin 13 into the elongated hole 14a, a back and forth movement mechanism using a cam or an electromagnetic solenoid may be provided. It is sufficient.

DETAILED DESCRIPTION OF THE INVENTION According to the present invention, the locking pin that moves relative to the circumferential surface of the drum of the drum-type weft storage device to control the locking and unwinding of the weft yarn, In order to realize the backward movement of the locking pin, at least immediately after cutting the weft, the locking pin is moved backward in the opposite direction to the weft payout direction and pulled back while the weft is locked. Since it is only necessary to make a slight modification to the conventional locking pin drive mechanism, there is no need to add any complicated mechanism, and unlike conventional methods, the weft yarn is bent greatly by the yarn guide when it is pulled back. Therefore, there is no risk of generating fuzz on the weft yarns, and even when inserting multi-colored wefts, there is no need to worry about space problems, which is an excellent effect.

In addition, the locking pin can be moved back and forth continuously before and after cutting the weft yarn, and in that case, the inserted weft yarn before being bruised can be tightened, so that the woven fabric is not loosened. Another advantage is that it is easy to effectively prevent defects from occurring.

[Brief explanation of drawings]

Figures 1 to 3 show an embodiment of a device for carrying out the present invention, with Figure 1 being an explanatory diagram of the overall concept, Figure 2 being an exploded perspective view of the locking pin drive mechanism, and Figure 3 being an explanation of its operation. It is a chart. 4 and 5 show other embodiments, FIG. 4 is a side view of the main parts of the device, and FIG. 5 is an explanatory diagram of the operation sequence.
The operation of the locking pin progresses in the order of ˜D>. W... Weft 2... Weft insertion nozzle 10... Weft storage device 11.14... Drum 11a... Flange portion 11b... Cylindrical portions 11c, 14
a-...Long hole 13...Lock pin

Claims (1)

[Scope of Claims] 1) A drum for winding and storing a weft yarn on its circumferential surface, and a drum that locks and unwinds the weft yarn by moving relative to the circumferential surface of the drum. When storing and paying out the weft yarn using a drum-type weft storage device equipped with a locking pin that controls the timing of weft yarn payout from the drum,
Immediately after cutting the weft after reshaping, at least, the locking pin that locks the weft is moved and retreated in a direction opposite to the direction in which the weft is fed out, and the weft at the tip of the weft insertion nozzle is pulled back. A method for pulling back weft threads in a fluid jet loom, characterized by: 2) The fluid jet loom according to claim 1, wherein the movement and retreat of the locking pin in a direction opposite to the weft payout direction is performed continuously before and after the weft cutting. Weft pulling back method. 3) The drum includes a flange portion having a conical surface inclined in the weft payout direction and a cylindrical portion continuous with the flange portion, and the locking pin moves in the generatrix direction of the cylindrical portion. The fluid injection type according to claim 1 or 2, wherein the timing of paying out the weft is controlled by inserting and removing the tip into a long hole provided in the flange. How to pull back the weft thread in a loom. 4) The drum is a cylinder having an elongated hole in the generatrix direction, and the locking pin moves in the radial direction of the cylinder and inserts/removes its tip into the elongated hole, thereby allowing the weft to be fed out. A method for pulling back a weft yarn in a fluid jet loom according to claim 1 or 2, characterized in that the timing of the following steps is controlled.