JPS5971458A - Weft yarn passing apparatus in 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 The present invention relates to a weft threading device with a gripping bar that can be inserted into an opening and returned again in a shuttleless loom. Generally, in this type of loom, a tube is provided into which the gripping rod is inserted during its return movement. This tube not only prevents the risk of injury to the worker, but also protects the gripping rod when it is pulled out. In order to achieve improved guidance of the gripping rod and to reduce its vibrations and ensure good weft passing, a guide surface sliding in contact with the tube wall at the rear end of the gripping rod It has been proposed in 1. This guide surface is made, for example, in the form of a piston, with a through opening being provided between the cylindrical ring forming the guide surface and the radial support supporting this ring. The through openings between the radial supports allow air to flow inside the tube during piston movement 6'). However, this flow is uncontrolled and has a cooling effect only under limited conditions.

A weft threading device with a grip that can be inserted and pulled back is described in French Patent No. 2060258. The rod-like threading device is driven by an electric linear motor and guided in a sliding bearing. To the rear of the gripping rod there are bushings which run through the cylinder and at both ends of the closed cylinder, so that the moving mass can be elastically stopped at the end of the forward and return strokes. In the interior of the cylinder the rod supports a piston, which compresses the air present in the cylinder at its end and thereby elastically absorbs the movement. The desired elastic action at the cylinder end can be adjusted by a more or less fully closable opening in the cylinder wall.Instead of a compressed air cushion, a mechanical spring could also be provided at the cylinder end. There is no further use of the air conveyed by the piston, in particular no flow of air from one piston side to the other in the same way as with the installation of the device mentioned at the outset.

The object of the invention is to control and to make full use of the uncontrollable air flow through the guide piston of the gripping rod in a device of the type mentioned at the outset. According to the invention, this object is achieved in that the piston has a device for generating a rectified air flow.

Devices for generating a rectified air flow are, for example, mechanically or pneumatically acting valves.

The rectified air flow not only provides good cooling of the guide tube over its length, but also can be directed against the gripper support and drive. Furthermore, it can also be used as an air pump and air pipes, e.g. hoses, can direct the air conveyed by the piston to another location, e.g. a loading point, where it can be blown out for cooling or for other purposes, e.g. to remove dirt, etc. can also be connected to the end of the guide tube.

Embodiments of the present invention shown in the drawings will be described in detail below.

FIG. 1 shows a cross-sectional view along line A-A in FIG. 2,
FIG. 2 shows a sectional view along 13-B and lK in FIG. 1. The piston 3 slides along the wall of the guide tube 1. The piston 3 is attached to one end of the grip bar 2 provided with a rack, for example by a bolt 4. Since the arrangement structure of the racks on the grip bar 2 and the drive of the grip rod 2 by the pinion are well known, their explanation will be omitted here.

In FIG. 2, the cross section of the grip bar is shown in broken lines.

The piston 3 is also provided with a sliding layer, for example.

A 1-valve is arranged on the piston to allow flow through in one direction. These valves can be of various types.

In this embodiment, an aerodynamic valve 5 is used. When the piston 3 moves to the left, air flows into the piston in the direction of the arrow e from left to right and is discharged to the right. When the piston 3 moves in the opposite direction, i.e. when the clicker rod 2 moves to the right, a small amount of dark air flows past the valve due to the vortex formation, and due to the difference in air flow, it moves to the right. 5 air transport occurs. In FIG. 2, a plurality of valves are uniformly distributed over the piston bottom of the piston 3.

FIG. 3 schematically shows, as a simple example, the use of the device for cooling the support device and the gripper drive. The guide tube 1 is at least partially open at its left end 1a and at its right end 1b. The gripping bar 2, which has a gripping head 2a at its end, is driven in both directions by a drive pinion 8, shown in dashed lines. For guiding the gripper bar 2, horizontal guide rollers 6 and vertical guide rollers 7 are provided. In this case, the valve is installed in the manner of operation described in FIG.

Therefore, when the gripping rod 2 is moved to the right in the direction of the arrow, the air which is to the right of the piston 3 in the tube I is conveyed through the tube end to the right in the direction of the arrow. Air is then blown out to cool the bearings and the drive 6.7.8. Air flows into the interior of the tube through the left-hand end 1a of the tube, whereby the tube section is filled from the left side of the piston 3. When the piston moves in the opposite direction, ie when the gripping rod 2 is returned into the tube 1, the valve 5 on the piston 3 is flowed through and the part of the tube 1 to the right of the piston 3 is filled. That is, as in FIG. 1, a rightwardly rectified pipe flow occurs. Due to this throughflow, as mentioned above, not only the gripping rod support device but also the tube 1 and the inner body of the piston 3 are cooled.

FIG. 4 shows the case where the flow direction is reversed, ie the direction of action of the valve in the piston 3 is opposite to that of the device of FIGS. 1 and 3. The overall built-in structure is not much different from that shown in FIG. The tube end 1a is not opened but is closed. There, a closed air line 9 is provided in the outlet pipe. This air line 9 leads to a loading point, for example near a weft thread cutter, from which thread debris must be removed.

In the case of the arrangement as a pump according to FIG. 4, the direction of flow through the tube 1 is from right to left, so that with each retraction of the gripper and with a movement of the piston 3 towards the left, the air is It is conveyed to the loading point through piping 9,
There it is blown out through the nozzle and opening piece 10. Regarding the use of the device as an air pump, there are various 7j
Another method is possible. In some cases surge tank 1
1 may be connected intermediately, or a similar tank may be provided in the air piping 9.

Both of the above-mentioned applications of the gripping rod guide have the advantage on the one hand of improving guidance and preventing vibrations, since no special equipment is required to generate the airflow, and on the other hand the advantage of improving the guidance and preventing vibrations. This has the advantage of conveying air in the direction of conveyance.

[Brief explanation of drawings]

Figure 1 is a longitudinal sectional view of the gripping rod with the guide piston (
Figure 2 is a cross-sectional view of the guide tube (cross-sectional view taken along line 13-13 in Figure 1), and Figure 3 is a cross-sectional view of the guide tube for cooling. FIG. 4 is a cross-sectional view of the device using the pump. DESCRIPTION OF SYMBOLS 1...Guide tube, 2...Gripper rod, 3...Piston, 4...Bolt, 5...Valve, 6...Horizontal guide roller, 7...Vertical guide roller, 8...・・Drive pinion,
9...Air piping, 10...Nozzle, 11...Surge tank. Applicant's agent Kiyoshi Inomata Fig, i Fig, 2 H Procedural amendment 1. Display of the case 1982 Patent Application No. 130386 2, Name of the invention Weft threading device for a loom 3, Person making the amendment Relationship to the case Patent applicant Lindawell, Dornier, Gesellschaft, Mituto, Peschlenktel, Hufsung 7, "Detailed Description of the Invention" column of the specification to be amended. 8. Contents of amendment

Claims (1)

[Scope of Claims] 1) In a shuttleless loom, the gripping rod is inserted into the opening and can be returned again, and the gripping rod runs in a tube surrounding the gripping rod in the rear part of its trajectory. In a weft threading device with a grip bar in a shuttleless loom, the rear end of the grip bar has a guide surface formed in the shape of a piston and sliding in contact along the wall of the tube, A weft threading device with a grab bar in a shuttleless loom, characterized in that the piston has a device for generating a rectified air flow. 2) Device according to claim 1, characterized in that a valve is arranged in the piston. 3) Device according to claim 2, characterized in that an aerodynamic valve is arranged in the piston. 4) Device according to any one of claims 1 to 3, characterized in that the conveying air flow is directed at the support and drive device of the gripper bar. 5) The device according to any one of claims 1 to 3, characterized in that it is used as an air pump together with an air pipe connected to a pipe and leading to a loading point. 6) The device according to claim 5, characterized in that a surge tank is incorporated in the air piping.