JP4463433B2 - Gripper and device for inserting weft - Google Patents

Abstract

The gripper comprises a housing (1), a clamping part (5) what a hook-like clamping section (12) receiving a weft yarn and a clamping unit (6) with a clamping tongue (22), a torsion bar (23) and a cover plate (7). The clamping tongue (22) is pivotable, cooperates with the clamping section (12) and is influenced by the torsion bar (23) in order to clamp the weft yarn. The clamping force is applied by the torsion bar (23) and the effect of the clamping is neutralized by the cover plate (7). One advantage of the gripper is that it consists of a minimum number of parts. Another advantage is that it is extremely compact.

Description

[0001]
The present invention relates to a gripper, a device for inserting a weft thread, and a loom equipped with such a device as described in the preamble of claim 1.
[0002]
Grippers with variously configured thread clamps are known. The thread clamp is substantially composed of a fixed tightening portion, a movable tightening portion, a spring element, and an operation member, and is different from each other in terms of a tightening method and a tightening motion.
[0003]
In some grippers, the fixed tightening portion is configured as a case having a hook-like tightening portion for receiving the weft, and the movable tightening portion is acted on by a coil spring to tighten the weft in the longitudinal direction of the case. It is configured as a slidable fastening tongue. An operating member is coupled to the clamping tongue in order to guide and slide the clamping tongue in the case against the spring action.
[0004]
In another gripper, the fixed tightening portion is configured as a case with a hook-shaped tightening portion for receiving the weft, and the movable tightening portion is acted by a coil spring to tighten the weft, and the longitudinal direction of the case It is comprised as a clamping lever which can rock | fluctuate around the axis | shaft extended across.
[0005]
The use of a coil spring has proved disadvantageous because it must be provided with a space for it and means for holding and / or guiding it.
[0006]
The gripper of the kind indicated at the beginning closest to the invention is known from DE-B-1087088. The torsion spring is configured as a coil spring and is arranged on a swingable handle, and this handle carries a fastening tongue. The torsion spring is supported by the case portion by the first projecting spring arm and is supported by the finger piece coupled to the handle portion by the second projecting spring arm, thus applying elastic torque to the handle portion. This configuration requires a lot of structural space across the handle axis and to the extent that it is opposed to the small and slender structural style required for grippers. There is no plan to adjust the spring force of the torsion spring.
[0007]
The object of the present invention is to improve the gripper.
This problem is solved according to the invention by the features of claim 1.
[0008]
The advantages achievable with the present invention are substantially that the gripper has very few individual parts, very little mass, requires little construction volume across the stem axis, and little It can be seen that it operates with a clamping force and that the clamping force is adjustable.
[0009]
According to the invention, the device for inserting the weft is characterized by the characterizing part of claim 8.
[0010]
Hereinafter, the present invention will be described with reference to the accompanying drawings.
[0011]
Reference is made to FIGS. 1 and 2 showing the gripper 1 and the gripper band portion 2. The gripper 1 has a case 4, a fastening part 5, a fastening unit 6, and a hanging piece 7 for operating the fastening unit.
[0012]
The case 1 is made of plastic and has a hole 8 for receiving the fastening unit 6. The tightening portion 5 is made of metal and is coupled to the case 4.
[0013]
The tightening portion 5 includes a portion 11 for fixing to the case 4, a hook-shaped portion 12 for receiving the weft, and a protrusion that covers and grips the gripper band 2 to prevent warp damage when the weft is inserted. 13. The hook-shaped portion 12 has a fastening surface (not shown). A hole 14 is provided in the bowl-shaped portion.
[0014]
The tightening unit 6 includes a tubular handle portion 21, a tightening tongue piece 22, and a torsion rod 23. The torsion rod is disposed in the handle portion and one end is coupled to the handle portion 21 by a pin 24. In order to support the handle portion 21 in the region of the hanging piece 7, the handle portion 21 has two tubular protrusions 25. The fastening tongue piece 22 includes a coupling portion 26, one end of which is coupled to the handle portion, and a guide pin 27 at the other end. The fastening tongue piece 22 is coupled to the coupling portion 26 adjacent to the guide pin 27 so that the fastening tongue piece 22 projects radially from the coupling portion 26. The tightening unit has a sleeve 28 with an engagement hole 29 for tools, and this sleeve is fixed to the other end of the torsion rod 23 so that the engagement hole can be freely accessed. The sleeve 28 is rotatably disposed in the hole 8 of the case 1 and is connected to the torsion rod 23 by a pin 30. The sleeve 28 further serves to secure the clamping unit 5 in the case 1.
[0015]
Please refer to FIG. 3 and FIG. As shown in these figures, the flanged portion 12 and the fastening tongue piece 22 are provided with fastening surfaces 33 and 34 at 45 °, respectively, and are provided with grooves 35. As an advantage, the tightening surface is enlarged or the number of grooves is increased, the tightening length for the weft 36 is extended, the friction is increased, and the tightening force is weakened to prevent the weft from being damaged. be able to.
[0016]
As shown in FIG. 5, the vertical piece 7 for operating the tightening portion 5 is coupled to the handle portion 21 by tightening. For this purpose, a screw 37 is provided.
[0017]
As shown in FIG. 6, a clamping block 41 is arranged in the case 4 with a screw 42 in order to tighten the sleeve 28 firmly. As described above, the fastening unit 6 is fixed in the case 1 using the sleeve 28.
[0018]
Usually, the tightening force is adjusted according to the characteristics of the weft. For this reason, the tightening of the sleeve 28 is canceled by loosening the screw 42, and the sleeve is rotated by a tool (not shown). By this rotational movement, the direction of the fastening tongue is changed with respect to the hook-shaped part 12. Next, the tightening of the sleeve 28 is restored by tightening the screw (FIG. 6).
[0019]
When inserting the weft, the hanging piece 7 is displaced by an adjusting element (not shown) provided on the track of the gripper, whereby the direction of the tightening tongue piece 22 is changed with respect to the hook-like portion 12, and the weft is It is received in the saddle-shaped part. The return of the fastening tongue piece is performed based on the elasticity of the fastening unit 6. As shown in FIG. 2, the handle portion 21 is coupled to the torsion rod 23 by a pin 24, and the pin 24 is disposed close to the fastening tongue piece 22. The other end of the torsion rod 23 is coupled to the case 4 by a sleeve 28. However, the handle portion 21 can rotate around the torsion rod 23 to the maximum extent allowed by the torsion rod according to the amount of torsion force. The force for rotating the handle portion 21 relative to the torsion rod 23 is applied by the hanging piece 7 fixed to the handle portion 21 and moved by an adjustment element (not shown) located on the loom during the movement of the gripper.
[Brief description of the drawings]
FIG. 1 is a diagram of a gripper according to the present invention.
2 is a cross-sectional view taken along line II-II in FIG.
FIG. 3 is a view seen from the direction of arrow D in FIG. 1;
4 is a cross-sectional view taken along line IV-IV in FIG.
5 is a cross-sectional view taken along the line VV in FIG. 1. FIG.
6 is a cross-sectional view taken along line VI-VI in FIG.

Claims (9)

A gripper for inserting a weft, a case ( 4 ), a tightening part (5) having a hook-like tightening part (12) for receiving the weft, and a rotatable handle (21) Including a swingable tightening tongue (22) that cooperates with the tightening portion, and an operation member (7) for the tightening tongue, which are coupled to each other and tighten the weft thread under the action of a torsion spring. is disposed coaxially within the handle portion that is configured in a tube shape, a torsion rod de (23) is coupled so as not to rotate relative to one end shank (21), the other end tightening tongue tightening Gripper characterized in that it is connected to the case via adjusting means (28; 41, 42) for adjusting the force. Wherein the torsion rod de (23) is guided or supported in the region of the hook-shaped clamping portion (12), the gripper according to claim 1.   3. A hooked clamping part (12) and a clamping tongue (22) according to claim 1 or 2, characterized in that each clamping surface (33, 34) is provided with a groove (35). The gripper described.   Gripper according to claim 3, characterized in that the clamping surfaces (33, 34) are arranged at an angle of about 45 ° with respect to the gripper band (2).   5. A coupling part (26) rotatably supported in the case is coupled to the handle part (21) and carries a clamping tongue (22). The gripper according to item 1. 6. Gripper according to claim 5, characterized in that the coupling part (26) is guided or supported in the region of the hook-like clamping part (12).   The gripper according to claim 1, characterized in that the operating member (7) for the fastening tongue (22) is fixed to the handle (21).   A device for inserting a weft, comprising a gripper band (2) and the gripper described in any one of claims 1 to 7, wherein a case (4) is fixed to the gripper band (2). The tightening part (5) has a protrusion (13), and the protrusion covers and grips the gripper band (2).   A loom comprising the apparatus according to claim 8.

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