JPS5943575B2 - Weft insertion device for band cloth loom - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention comprises two relatively movable and cooperatively actuated knotting needles whose free ends move around a pivot axis in a curved manner and have at least one knotting needle. The present invention relates to a weft insertion device for a shuttleless loom, particularly a band cloth loom, which is equipped with a weft insertion device.

In a shuttleless loom, the weft is moved back and forth in a straight line, and weft insertion is performed using rod-like devices introduced into the shuttle from both sides, one of which is installed at its free end. It is known that the weft thread is introduced into the shed over the center of the fabric by means of a grasper, and the second rod-like device also grasps the weft thread by means of the grasper, so that upon retraction of both devices the weft thread is drawn completely through the shed. It is.

Such a device is described in British Patent No. 546,493.

Such linearly moved weft thread insertion devices have the disadvantage that they must be moved during guidance, which results in considerable wear and tear on the weft thread insertion devices.

In addition, complex machinery is required to achieve linear motion,
Therefore, high weaving speeds cannot be achieved.

Also part of the state of the art is the use of rotatable weft insertion devices that move in a straight line and can insert the weft threads into the shed over the entire length of the fabric; On the other hand, high weaving speeds cannot be achieved due to the vibrations resulting from the long path.

Furthermore, two rotating weft insertion devices are provided on both sides of the fabric, and the two weft threads are guided from both sides of each fabric to the center, where they are bound using a single knotting thread using a knotting needle. , is known from German Patent Application No. 1804973.

In such a weft insertion device, in addition to the drive mechanisms for both weft insertion devices, a drive mechanism for the center needle is required, and this mechanism must operate synchronously with both weft insertion devices. However, the fabrics made in this way always have a string-like bulge in the center.

All these known weft insertion devices can only be used for inserting double weft threads.

The object of the present invention is that each weft insertion device rotates only a part of the shed each time and passes through S, that is, it is moved by a simple mechanism without vibrations, so that the thread feeding can be carried out safely. The point is to create a weft insertion device that can be used.

The weft insertion device is shaped so that both weft insertion devices moving opposite each other rotate in order to insert one or more weft yarns, and in this case, one of the weft insertion devices moves to guide the weft yarn. To,
It has an eye, a gripper or a notch, and the free end of the other weft insertion device has a hook or gripper for gripping the yarn.

With such a weft insertion device, vibration-free or extremely high operating speeds are achieved.

Particularly advantageous results are obtained by shaping the hook with a crown and an enlargement oriented almost radially relative to the vibration axis.

In this case, on the one hand, a safe reception of the weft thread is achieved, and on the other hand, the weft thread slides off the hook without pulling out the thread.

Particularly good results are obtained if the shoulder encloses an angle of 90° to 100° with the moon.

If the shoulder of the weft insertion device moves to a curved part with a small radius on the side facing the moon and moves to a curved part with a large radius on the side opposite to the moon, the weft yarn at the hook of the weft insertion device The handling becomes significantly easier.

The engagement of the hook into the loop of the weft thread is facilitated when the enlarged part becomes pointed on the side opposite to the moon.

Furthermore, the shaping of the weft inserting device supporting the hook becomes particularly advantageous if the enlargement is designed rotationally symmetrically with respect to the axis of the moon.

In this case, the legs of the weft thread loop remain at a constant distance, which facilitates the engagement of the knotting needle.

The invention will be explained with reference to the drawings.

The weft inserting device shown in FIGS. 1 to 4 rotates around pivot axes 3 and 4, and the two weft threads are placed in a rotary motion from crank plates A and B via connecting rods 5 and 6. It has insertion devices 1 and 2.

The free end of the weft thread insert 1 has a thread 7 through which the weft thread 8 is guided, and the free end of the weft thread insert 2 has a hook 9 which acts as a gripping piece.

A shed 10 is formed by the weft, and the shed
It ends there.

The woven board 12 serves to strike each weft thread 8 and the knotting needle 13
serves to tie the weft yarns on one side of the woven band 14.

The operating mode of the weft insertion device is as follows.

In the first operating step according to FIG.
When the weaving board 12 is at the maximum distance from the weaving front 11 after the weft inserts 2 or Hook 9 is in an empty state.

In the second operating step shown in FIG. 2, the weft thread inserter 1, upon rotation, pulls the weft thread 8 into the shed to the position shown.

In this position, the free end of the insert 2 intersects the free end of the insert 1, which is made possible by the curved design of both inserts, and the hook 9 grips the weft thread 8.

In the third operating step shown in FIG.
is again pivoted outwards and the weft thread 8 is pulled out of the shed from the hook 9 to the right, in this case sliding through the insertion device 10 which also pivots outwards. , is grasped by the knotting needle 13.

In the fourth operating step shown in FIG.
2 reaches the outermost position again.

The weft yarn 8 is knitted by the knotting needle 13, the weaving board 12 has finished striking, and the shed is replaced.

The subsequent operating sequence is repeated from the beginning.

In order to make the reception of the thread safe and easy, the drives, e.g. the two crank plates A, B, can be adjusted somewhat in time in relative relation, so that one insert is more or less similar to the other. It rotates somewhat faster than the other parts.

In the modification shown in FIG. 5, a cutout 15 is provided in the insertion device 1 instead of the thread 70, and the cutout guides the weft thread 8 to the heel 9,
In this case the process has the same sequence as described above.

Using the notch 15 instead of the eye 70 makes it possible to insert different weft yarns into the shed alternately, and in this case, the desired weft yarn is brought to the front of the notch 15 when the insertion section 10 is rotated. It is enough.

6 and 7 show a particularly advantageous formation of the hook 9a, which has an enlarged portion 17 connected directly to the loop of the thread 8, and which has a ring 16 oriented approximately radially of the pivot axis 4. Consists of.

The enlarged portion has a shoulder 18 that is approximately transverse to the moon.

The layer forms an angle α, in particular 90° to 100°, with the moon.

The shoulder portion 18 transitions to a curved portion 19 having a small radius r1 on the side facing the moon, and transitions to a curve 20 having a large radius r2 on the side facing away from the moon 16.

The enlarged portion has a tip 21 on the side opposite the moon 16.

The enlargement simply has a side in the direction of the loop of the weft thread 8;
It is advantageous that it is designed flat and extends in the plane of movement of the weft thread insert 2, and that the enlarged part is designed mirror-symmetrically with respect to the lunar axis 22.

It is further advantageous to design the enlargement rotationally symmetrically with respect to axis 22.

A simple weft insertion device with such short rotational movements and easy adjustment makes it possible to weave with high weft speeds, with low effort and virtually no failures.

The device can be used for inserting not only double wefts but also single wefts.

[Brief explanation of the drawing]

1 to 4 are plan views showing four different operating steps of the weft insertion device, FIG. 5 is a plan view showing the deformed free end of the weft insertion device, and FIG. 6 is a plan view of another weft insertion device. FIG. 7 is an enlarged view of the hook of the weft insertion device according to FIG. 6. 1.2...Both weft insertion portion, 7...stitch,
8... Thread, 9.9a... Hook, 16
...Shouzuki, 18...Shoulder.

Claims (1)

[Scope of Claims] 1. It is provided with two weft insertion parts that are driven in opposite directions, and the free ends of the insertion parts move around a rotation axis in a curved manner. , in a weft insertion device used in a band cloth loom configured to provide a thread at one free end of the two warp thread insertion parts, a hook 9 is provided at the free end of the other weft thread insertion part 2. The hook 9 is provided with a weft 16 extending in the radial direction of the rotation shaft 40, and an enlarged portion 17 and a shoulder portion 18 extending laterally with respect to the weft 16 are formed near the weft 16, respectively. A weft insertion device for a band cloth loom, characterized by: 2 The shoulder portion 18 of the hook 9 is at an angle of 90° from the longitudinal direction 16.
A weft thread insertion device for a band cloth loom according to claim 1, wherein the weft thread insertion device forms an angle in the range of up to 00°. 3 The shoulder portion 18 transitions into a curved portion 19 with a small radius r on the side facing the weft and weft 16, and transitions into a curved portion 20 with a large radius r2 on the side facing away from the weft and weft 16. A weft insertion device for a band cloth loom according to claim 1. 4. The weft insertion device for a band cloth loom according to claim 1, wherein the enlarged portion 17 extends to the tip 21. 5. The weft insertion device for a band cloth loom according to claim 1, wherein the enlarged portion 17 is formed rotationally symmetrically with respect to the axis 22 of the warp and weft 16.