JPH0116939B2 - - Google Patents

Description

Detailed Description of the Invention The present invention provides a rapier loom equipped with a positive opener of the type in which the carrier rapier reciprocates on a sled that makes a beating motion. This invention relates to a method and device for preventing weft loosening when being towed.

Generally, in rapier type looms, the carrier rapier that enters the warp opening from the opposite yarn feeding side receives the weft carried by the insert rapier approximately at the center of the loom, or after gripping the weft from the yarn feeding device directly, the carrier rapier enters the warp shedding from the opposite yarn feeding side. The weft is inserted by retreating inside the opening.

By the way, the carrier rapier, which has retreated while gripping the weft, releases its grip on the weft after its tip passes the selvedge of the fabric and generally before beating. In this case, the weft released from the carrier rapier is gripped by the ripping thread in the selvage of the fabric, but if the weft is a slippery yarn or a highly elastic yarn, gripping only by the ripping thread is insufficient. This not only causes weft loosening defects in the fabric and deteriorates the quality of the fabric, but also, depending on the type of weft, the weft may come off near the selvedge of the loom, making it impossible to weave it as a product. There is an inconvenience.

This invention was proposed in view of the occurrence of such conditions as weft loosening in rapier looms.
The object of the present invention is to provide a method and device for preventing weft loosening in a rapier loom, which is highly versatile and capable of weaving high-quality fabrics without causing problems when weft loosening occurs.

That is, the gist of this invention is that at the position where the carrier rapier passes through the pinning thread part of the fabric while holding the weft thread, the rapier movement is temporarily stopped until near the beating time, and the weft thread is inserted into the warp thread. The carrier rapier's grip on the weft is released from around the above-mentioned weft beating time when the pinched weft loosening does not occur, and the carrier rapier is moved to the restart position to improve the stability of the rapier's posture when inserting the rapier. We will do our best to ensure this.

The method and device for preventing weft loosening in a rapier loom according to the present invention will be described in more detail below with reference to the accompanying drawings.

The method for preventing weft loosening in a rapier loom of the present invention is to first grasp the weft W and temporarily stop the retreating carrier rapier 5 at a position where its tip has passed through the edge of the fabric CL, that is, the weft thread SY (the first (see figure). This state is then maintained until about the time of reeding when the weft does not become loose. After that, Carrier Rapier 5
The weft grip is released, and at the same time, the carrier rapier 5 is moved to the restart position.

Next, a device for carrying out the method for preventing weft loosening in a rapier loom according to the above invention will be described.

That is, as shown in FIG. 1, the rapier guide 1 is attached so as to perform a striking motion together with the reed 3. The carrier rapier 5 is located within the rapier guide and reciprocates in the weft insertion direction. As shown in FIG. 2, a catcher opener lever 7 is rotatably supported at a predetermined position on the rapier guide on the rapier side of the reed driving body. There is a catch opener 9 in the section.
is installed. One end of a first rod 20 for rotating the catcher opener lever 7 is pivotally supported at a predetermined portion on the opposite side of the catcher opener lever 7. The other end of the first rod 20 is connected to one end of a second rod 22 via a turnbuckle 21. By adjusting the turnbuckle 21, the amount of movement of the catch lever can be adjusted.

The other end of this second rod 22 is connected to one limb of an L-shaped middle lever 25, and the other limb of this middle lever 25 is connected to a third limb.
It is connected to one end of the rod 26.

By the way, the middle lever 25 is the bracket 24.
The bracket 24 is rotatably supported by a shaft, and this bracket 24 is attached to a locking shaft 17 of the slew motion. Although this middle lever 25 does not necessarily have to be attached to the locking shaft 23, it is necessary that the connection point P between the middle lever 25 and the second rod 22 be at a position where it is less affected by the shoving motion.

Furthermore, the other end of the third rod 26 is a fulcrum 27P.
It is connected to the lower limb of the cam lever 27, which rotates around the cam lever 27. A cam ball 28 is attached to the tip of the upper limb of the cam lever 27. This cam ball 28 is in pressure contact with the cam surface of a cam 30 attached to a shaft 29 that rotates in synchronization with the beating of the reed. In the figure, reference numeral 31 denotes a spring that biases the cam lever 27 clockwise in order to keep the cam ball 28 in pressure contact with the cam surface of the cam 30 at all times. Also, 4 is a rapier's flexible tape, and S is a slay sword.

Next, the operation of the above-described device will be explained.

First, as shown in FIG.
The backward movement of the carrier rapier 5 is temporarily stopped when the carrier rapier 5 passes through. In order to temporarily stop the carrier rapier in this way, if the rapier moves by cam drive, the shape of the cam may be set accordingly.

At a predetermined time while the carrier rapier 5 is stopped, that is, after the sleigh moves to the vicinity of reeding where the movement of the sleigh progresses and the weft does not loosen (see Fig. 3), the cam ball 28 detects the lift amount of the cam 30. Then, actuate the cam lever 27 to release the third rod 26.
is pushed to the left side in the figure, and the first rod 20 is pushed upward accordingly. As a result, the catch opener 9 attached to the catch opener lever 7 is actuated, and as shown in FIG. 3, the catch lever 6 of the carrier rapier 5 is pressed to release the weft grip. When the carrier rapier 5 is moved backward again in this state, the carrier rapier 5 moves back to the predetermined position shown in FIG. 4 while releasing the weft.

The operation period of the catcher opener 9 may be at least until the weft comes out of the carrier rapier 5 while the carrier rapier 5 is retreating to a predetermined position where it restarts.

Next, the moving state of the carrier rapier described above is shown in FIG. 5 by the locus of the tip of the carrier rapier. A trajectory M indicates that the carrier rapier holding the weft is moving backward, and a trajectory N indicates that the carrier rapier is moving forward from a predetermined restart position. Also, the BE line is at the time of reed stroke.
The carrier rapier holding the weft and retreating is pulling the weft.
It stops temporarily at point b after passing through the SY (see Figure 1), and continues to move forward with the shoving motion to point d, which is the point at which it struck the shod. The catch opener operates near this area,
Release the weft grip of the catch lever (see Figure 2). From this point on, the beating movement begins to retreat, and
The carrier rapier also moves backward to the restart position f with the weft grip released, and thereafter moves forward while following the N trajectory at a predetermined time.

By the way, the point at which the carrier rapier starts to release the weft grip is when the reed reaches the most advanced point d, but since the carrier rapier is further moved backward in the rapier extending direction with the gripping portion released, the rapier The weft yarn gripped by the weft can be easily pulled out from the rapier. Further, when the weft yarn is pulled out, the fuzz that remains on the weft yarn gripping portion of the carrier rapier can be removed.

In addition, to remove the weft thread from the carrier rapier,
From point d to e when the rapier is retreating in the direction of rapier extension
However, the time during which the catch opener presses the catch lever of the rapier may be from point d to point f.

Furthermore, although the carrier rapier 5 has been described as stopping completely between points b to d, it may be continued to be moved backward little by little.

According to the above-mentioned invention, since the carrier rapier holds the weft until approximately the point of reeding, there is no possibility that the weft will become loose.

Furthermore, since the restart position of the rapier is set at a point further backward from the weft grip release point, the posture at the time of rapier insertion is stable, and errors in weft insertion do not occur.

[Brief explanation of drawings]

FIG. 1 is a partial plan view of a device for carrying out the method for preventing weft loosening in a rapier loom of the present invention, FIG. 2 is an explanatory diagram showing drive yarn loosening of the device, and FIGS. 3 and 4 are FIG. 5 is an explanatory plan view showing the operating state of the device for carrying out the method for preventing weft loosening in a rapier loom according to the present invention, and shows the locus of the tip of the carrier rapier when the method for preventing weft loosening in a rapier loom according to the present invention is used. FIG. 1... Rapier guide, 3... Reed, 5... Carrier rapier, 6... Catcher lever, 7... Catcher opener lever, 9... Catcher opener, 2
0, 22, 26... Rod, 21... Turnbuckle, 23... Locking shaft, 24... Bracket, 25... Middle lever, 27... Cam lever, 28... Cam ball, 29... Shaft, 3
0...Cam, W...Weft, CL...Woven fabric, SY...
Stirring thread.

Claims (1)

[Scope of Claims] 1. In a type of rapier loom in which a carrier rapier reciprocates on a sled that performs a beating motion, the beating starts from the time when the tip of the rapier passes through the selvedge of the fabric while the carrier rapier is grasping and retracting the weft. The retraction of the carrier rapier is temporarily stopped at a predetermined time up to about 1000 hrs, and during the stop, the weft grip of the rapier is started to be released, and after that, the carrier rapier is moved so that at least the weft thread is pulled out of the carrier rapier while the grip is released. A method for preventing weft loosening in a rapier loom, characterized in that the weft is removed from a carrier rapier by moving the weft backward by a distance necessary for the weft. 2. In a rapier loom equipped with a positive opener of the type in which the carrier rapier reciprocates on a sled that makes a beating motion, its retreat is temporarily suspended for a predetermined period of time from the time when the carrier rapier exits the warp shedding until approximately the time of beating the reed. In addition to driving the positive opener to stop, the positive opener has an engagement surface with the catch lever of the carrier rapier that is larger than the length of the weft end portion gripped by the carrier rapier, and the operating period of this opener is set to the above-mentioned temporary period of the carrier rapier. A weft loosening prevention device for a rapier loom, characterized in that the weft loosening prevention device is set to operate from the time of stop until at least the time when the catch lever of the carrier rapier passes the above-mentioned engagement surface.