JPS6119743B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention includes at least one curved shuttle guided in an annular passage, a weft pipe rotatably provided within the shuttle, and a weft pipe for monitoring the weft thread and controlling the weft thread when cutting the weft thread. The present invention relates to a weft stopper for a circular loom, including a light source or photocell for stopping the circular loom, and at least one set of reflectors.

Various devices are known that are provided with light blocking materials for monitoring weft yarns. This light blocking material is arranged in the path of the weft thread or monitors the course of the shuttle and stops the drive of the circular loom when the weft thread is cut. However, the method of operation of these known devices has often been unsatisfactory.

It is an object of the invention to provide a particularly reliable device for monitoring the weft threads in circular looms.

To achieve this objective, the lateral stop device of the present invention is equipped with a reflecting mirror. This reflecting mirror is provided within a rotatable horizontal pipe and is covered with a plurality of lids. These lids can rotate freely within the horizontal tube and rotate in the radial direction when centrifugal force is applied. The rotation axis of the lid is disposed inside along the periphery of the horizontal pipe and is spaced parallel to the rotation axis of the horizontal pipe.

In the case of the present invention, the weft pipe itself is monitored.
When the thread is on the correct course, the weft tube is rotating and the rotatably arranged lid rotates outward radially under centrifugal force to cover the reflector. When the lid is rotated outward, it forms a surface that completely surrounds the reflector. However, when the weft yarn is cut, the weft stopper and the rotatably provided lid return to the rotation start position, and the lid no longer covers the reflecting mirror. The light rays emitted from the light source are then reflected by the mirror and emit pulses. This pulse stops the drive of the circular loom.

It is known from US Pat. No. 3,553,467 to place a rotating coating in the light path of an optical rotating monitoring device. However, the present invention relates to a weft stop device for a circular loom and therefore differs from known devices in its class. Furthermore, the coating in the known device is not rotated outwardly by centrifugal forces to cover the reflector during rotation. Instead, in the known device, when the device is stopped, the coating falls down due to gravity, thereby blocking the path of light. Further differences between the present invention and known devices are as follows. That is, in the case of the present invention, the lid is arranged at a distance from the axis of rotation of the horizontal tube, whereas in the case of the known device, the covering material is provided coaxially with the axis of rotation of the rotor.

According to yet another embodiment of the invention, the axis of rotation of each adjacent lid is provided for stopping the rotational movement of these lids.

The reflector extends completely around the entire circumference of the transverse tube, which is convenient for manufacturing.

Furthermore, the light source is arranged on the horizontal pipe, preferably at a distance above the horizontal pipe, which is also advantageous in manufacturing.

The present invention will be explained below with reference to the drawings.

FIG. 1 shows a curved shuttle 1 of a circular loom guided along a circular path 2. FIG. A weft pipe 3 is rotatably provided inside the shuttle 1, and the weft yarn 4 is sent out from the weft pipe 3 through a reed 5. The shuttle 1 is driven by a drive device (not shown).

The rotation axis of the horizontal pipe 3 which is rotatably mounted extends horizontally, and a reflective film, that is, a reflecting mirror 6 is provided inside the horizontal pipe 3. This reflecting mirror 6 extends over the entire circumferential surface as can be seen from the surroundings. Further, the reflecting mirror 6 is opposed to and associated with the light source 7 and the photocell. These light sources, ie photocells, monitor the weft thread and emit an impulse when the weft thread is cut, which impulse is sent to the relay 9. This relay 9 is arranged in the circuit of the drive motor 8 of the circular loom.

A rotatable lid 10 is provided inside the horizontal pipe and around the outer periphery of the reflecting mirror 6. The rotation axis 11 of the lid 10 extends parallel to the rotation axis of the horizontal tube 3, and these axes 11 are arranged around the reflecting mirror at intervals from each other. The width of the lid 10 measured in the radial direction is greater than the distance between each axis 11. Therefore, the rotation axis of each adjacent lid acts as a stop member that stops the rotation of the lid.

As shown in FIG. 2, when the horizontal pipe 3 rotates, the lid 10 rotates outward in the radial direction, and the reflector 6
form a surface that surrounds. However, when the weft thread is cut, the rotational movement of the weft pipe 3 is stopped, and at this time the lid body 10 returns to its original position. This situation is shown in FIG. The light rays emitted by the light source 7 are therefore reflected by the now uncovered reflector 6, as shown in broken lines in FIG. This reflector generates an impulse which causes the relay 9 to stop the drive motor of the circular loom.

Various modifications are possible within the scope of the invention. Thus, for example, the lid can be provided on both sides or can be suspended. It is also possible to replace the lid with a shutter or a blade. Reflectors can be made from one piece or from individual parts. In particular, the reflector can be made from individual point-shaped reflective elements. Preferably, the lid is made from plastic material. Moreover, the lid body can be formed integrally with their rotating shaft.

[Brief explanation of the drawing]

Fig. 1 shows a shuttle of a circular loom having a weft stopper according to the present invention, Fig. 2 is a sectional view taken along the - line in Fig. 1, in which the weft pipe is rotating, and Fig. 3 shows a shuttle of a circular loom having a weft stopper according to the present invention. Although it is the same as Figure 2, it is a drawing when the weft pipe is stopped, that is, when the weft thread is cut. 1...Shuttle, 3...Horizontal tube, 6...Reflector, 7...Light source, 10...Lid, 11...Rotation axis.

Claims (1)

[Scope of Claims] 1. At least one curved shuttle guided in an annular passage, a weft pipe rotatably provided within the shuttle, and a weft pipe that monitors the weft yarn and operates the annular loom when cutting the weft yarn. A weft stopper for a circular loom, which includes a light source to be stopped, i.e., a photocell, and at least one set of reflecting mirrors, the reflecting mirrors being disposed within a rotatable weft tube and covered by a plurality of lids. The lid is freely rotatable within the horizontal pipe and rotates in the radial direction under centrifugal force, and the rotation axis of the lid is provided along the circumference of the horizontal pipe and is parallel to the rotation axis of the horizontal pipe. A weft stop device for a circular loom, characterized in that the weft stop device is arranged parallel to and spaced apart from each other. 2. The weft stopper for a circular loom according to claim 1, characterized in that the rotating shaft of each adjacent lid is provided as a stopper for the rotational movement of the lid. 3. The weft stopper for a circular loom according to claim 1 or 2, characterized in that the reflecting mirror extends around the entire circumference of the weft pipe. 4. A circular loom according to any one of claims 1 to 3, characterized in that the light source is arranged above the weft pipe, preferably at an interval above the weft pipe. Horizontal stop device.