CN107287743B

CN107287743B - Yarn gripper for gripper shuttle loom

Info

Publication number: CN107287743B
Application number: CN201610311966.6A
Authority: CN
Inventors: K.布鲁诺格; P.加尼特
Original assignee: Individual
Current assignee: Individual
Priority date: 2016-04-13
Filing date: 2016-05-11
Publication date: 2020-11-03
Anticipated expiration: 2036-05-11
Also published as: EP3231910B1; EP3231910A2; CN107287743A; PL3231910T3; CN205636011U; EP3231910A3; TR201903638T4

Abstract

The invention relates to a thread clamp (1) for a gripper weaving machine and to a method for producing such a thread clamp (1). The gripper (1) comprises two clamping parts (2, 3) movable relative to each other for clamping, a first clamping part (2) comprising two guide recesses (4, 5) and a second clamping part (3) comprising corresponding guide tabs (6, 7) protruding towards the first clamping part (2). The guide recesses (4, 5) and guide tongues (6, 7) are positioned such that the guide recesses (4, 5) receive the guide tongues (6, 7) for sliding movement therein when the clamping parts (2, 3) are moved relative to each other, and the second clamping part (3) comprises a tongue body (9) constituting the guide tongues (6, 7) and a main body (8), the tongue body (9) being fixed to the main body (8) by means of a seam (10).

Description

Yarn gripper for gripper shuttle loom

Technical Field

The invention relates to a thread clamp for a gripper weaving machine, such as an Axminster gripper weaving machine, comprising two interconnected clamping portions which are movable relative to each other for clamping, a first of said clamping portions comprising at least two guide recesses and a second of said clamping portions comprising at least two corresponding guide tongues, said guide tongues extending towards said first clamping portion, the guide recesses and the guide tongues being positioned such that the guide recesses receive the guide tongues for sliding movement therein when the clamping portions are moved relative to each other.

The invention further relates to a method for producing such a thread clamp.

Background

Grippers for Axminster gripper looms are described, for example, in GB 1344979A, EP 1696059 a2 and EP 1365052B 1.

In GB 1344979 a and EP 1696059 a2, the gripper clamping parts are hingedly connected by means of a hinge joint and are provided with corresponding guide tongues and guide recesses for aligning the clamping parts during their movement.

In EP 1365052B 1, the gripper clamping portions are interconnected by means of intermediate elastic elements and are provided with staggered projections for aligning the clamping portions during their movement. But these protrusions are less suitable for aligning the clamping sections than the guiding tongues and guiding recesses as in the yarn clamp of GB 1344979 a and EP 1696059 a 2.

However, such guide tabs are weak parts of the gripper which are subject to wear and may bend or break. The function of the gripper is rapidly degraded when the guide tabs are worn, and in particular when one of the guide tabs breaks, the other cannot guarantee correct alignment of the gripping portions by itself.

Disclosure of Invention

The object of the invention is to provide a more fail-safe version of such a gripper.

This object is achieved by providing a thread clamp for a gripper weaving machine, such as an Axminster gripper weaving machine, comprising two interconnected clamping portions, which are movable relative to each other for clamping, a first of said clamping portions comprising at least two guide recesses and a second of said clamping portions comprising at least two corresponding guide tongues which protrude towards said first clamping portion, said guide recesses and guide tongues being positioned such that said guide recesses receive a sliding movement of the guide tongues therein when the clamping portions are moved relative to each other, and wherein said second clamping portion comprises a tongue body constituting said guide tongues and a main body to which said tongue body is fixed with a seam.

Such a seam forms a visible line which is formed when the main body and the tab body are joined over a particular area. They may be joined, for example, by brazing or laser welding or glue bonding, etc. This may be accomplished with or without the addition of additional material to the seam.

This seam now forms the weakest part of the grip. When the guide tab breaks, now the entire tab body will break and the entire gripper will fail. The function of the gripper will no longer gradually deteriorate, resulting in a non-optimal operation during a longer period of time, but will suddenly cease, resulting in a fail-safe version of such a gripper. The gripper will be repaired so that he can work again in an optimal manner.

Since the two guide tabs are coupled to the main body together as part of the tab body, the seam will be much longer than if the tabs were coupled to the main body alone. In this way, the seam is not too weak, so that the correct operation of such a gripper lasts for a period of time comparable to that of known grippers.

Since the tongue bodies are now manufactured separately, the guide tongues can also be made stronger than if they were formed as an integral part of the clamping part.

Preferably, the tongue body of the gripper according to the invention comprises a base from which the guide tongue extends. The main body is then preferably formed with a recess in which the bottom of the tongue body is placed. In this way, as the bottom part is embedded in the main body, the forces acting on the tongue body will be transferred to the main body, making the connection between the tongue body and the main body stronger.

Even more preferably, the bottom of the tongue body and the recess of the main body then have corresponding forms.

The two said guide tongues preferably extend transversely on opposite surfaces of the tongue body, so that the forces acting on the guide tongues due to the first clamping part entering between the guide tongues can at least partly compensate each other, so that the connection between the tongue body and the main body is less subject to these forces.

In a further preferred embodiment of the gripper according to the invention, the guide tabs are staggered. The guide recesses in the first clamping section are then also staggered, so that the first clamping section is less weakened by the provision of the recesses therein.

The guide tabs are furthermore preferably located near the ends of the clamping portions where the pile yarns are to be clamped, since at these ends the correct alignment of the clamping portions is most critical.

In a particularly preferred embodiment, the lengths of the guide tongues and the guide recesses are selected such that a portion of the guide tongue remains in the respective guide recess when the clamping parts are moved relative to one another. In this way, in each position of the clamping portion between the fully open position and the fully closed position, at least a portion of the guide tongue engages in the corresponding guide recess.

In a particularly preferred embodiment of the gripper according to the invention, the clamping sections are interconnected by means of at least one intermediate elastic element. Such intermediate elastic elements are less prone to wear than hinge joints.

The at least one intermediate elastic element of such an embodiment is preferably made of an intermediate elastic band.

The clamping portion and the intermediate resilient element of such an embodiment are preferably made of the same material.

The first clamping part, the body and the intermediate elastic element of such an embodiment are preferably made in one piece.

The object of the invention is also achieved by providing a method for manufacturing a gripper for a gripper weaving machine, such as a Zxminster gripper weaving machine, comprising two interconnected clamping parts, which are movable relative to each other for clamping, the first clamping part comprising at least two guide recesses and the second clamping part comprising at least two corresponding guide tabs, which protrude towards the first clamping part, the guide recesses and guide tabs being positioned such that the guide recesses receive a sliding movement of the guide tabs therein when the clamping parts are moved relative to each other, wherein a tab body is provided with two of the tabs, providing a main body to which the tab body is fixed with a seam so as to form a second clamping part.

In a particular method, the tongue body is secured to the main body by means of brazing.

In an alternative specific method, the tongue body is fixed to said main body by means of laser welding.

In a preferred embodiment of the method according to the invention the main body comprises a recess and the tongue body comprises a bottom, the guide tongue extending from the bottom, and the tongue body being placed with its bottom in the recess of the main body before fixing the tongue body to the main body.

The invention will now be explained in more detail by means of the following detailed description of some embodiments of the gripper and the method according to the invention. The description is given for the sole purpose of illustrating examples and points further advantages and features of the invention and should therefore not be construed as limiting the scope of application of the invention or the patent rights defined in the claims.

Drawings

In this detailed description, reference numerals are used to identify the accompanying figures in which:

figure 1 shows an embodiment of a gripper according to the invention in a front view;

FIG. 2 shows the gripper of FIG. 1 in front view, without the tongue body;

FIG. 3 illustrates, in front view, a tab body of the gripper of FIG. 1;

figure 4 shows the tongue body of the gripper of figure 1 in a top view.

Detailed Description

The shown thread clamp 1 for a gripper weaving machine, for example an Axminster gripper weaving machine, comprises two interconnected clamping sections 2, 3 which are movable relative to each other between an open position and a closed position, wherein pile threads can be clamped between the clamping sections 2, 3 and can be released.

The clamping portions 2, 3 are interconnected by means of an intermediate elastic band 11.

The first clamping section 2 of the gripper 1 is provided with two guide recesses 4, 5 which are staggered and positioned on opposite surfaces of the clamping section 2.

The second clamping part 3 of the gripper comprises a main body 8 and a tongue body 9 which are interconnected by brazing with a seam 10. Alternatively, the tongue body 9 may be coupled with the main body 8 by means of laser welding. The tongue body 9 comprises a bottom 14 and two

guide tongues

6, 7 which are staggered and extend on lateral sides from the bottom 14. The main body 8 is provided with a recess 13 in which the bottom 14 of the tongue body 9 rests.

The guide recesses 4, 5 in the first clamping part 2 and the

guide tongues

6, 7 in the second clamping part 3 are positioned such that the guide recesses 4, 5 receive the

guide tongues

6, 7 for sliding movement therein. In this way, these guide recesses 4, 5 and guide

tongues

6, 7 ensure correct alignment of the clamping parts 2, 3.

The lengths of the

guide tongues

6, 7 and the guide recesses 4, 5 are chosen such that at each position of the clamping parts 2, 3 at least a part of the

guide tongue

6, 7 remains in the respective guide recess 4, 5.

At the end where the pile yarns are clamped, the clamping parts 2, 3 are provided with teeth 12, so that the yarns do not loosen from the clamping parts 2, 3 when the pile yarns are taken along (takealong) by the gripper 1. The

guide tongues

6, 7 and the guide recesses 4, 5 are positioned in the vicinity of the teeth 12.

The clamping parts 2, 3 and the resilient element 11 are made of the same material.

The first clamping part 2, the body 8 and the intermediate elastic band 11 are made in one piece. The intermediate strap 11 is made small enough to ensure its elasticity, so that the clamping parts 2, 3 can move relative to each other due to the elasticity of this intermediate strap 11.

Claims

1. A gripper (1) for a gripper weaving machine, comprising two interconnected clamping portions (2, 3) which are movable relative to each other for clamping, a first of said clamping portions (2) comprising at least two guide recesses (4, 5) and a second of said clamping portions (3) comprising at least two corresponding guide tabs (6, 7) which protrude towards the first clamping portion (2), said guide recesses (4, 5) and guide tabs (6, 7) being positioned such that the guide recesses (4, 5) receive a sliding movement of the guide tabs (6, 7) therein when the clamping portions (2, 3) are moved relative to each other, characterized in that the second clamping portion (3) comprises a tab body (9) constituting the guide tabs (6, 7) and a main body (8), the tongue body (9) is secured to the main body by means of a seam (10).

2. Gripper (1) according to claim 1, characterized in that the tongue body (9) comprises a bottom (14) from which the guide tongues (6, 7) extend and in that the main body (8) is provided with a recess (13), the bottom of the tongue body (9) being placed in the recess (13).

3. Gripper (1) according to claim 1, characterized in that the two guide tongues (6, 7) extend transversely on opposite faces of the tongue body (9).

4. Gripper (1) according to claim 3, characterized in that the two guide tongues (6, 7) are staggered.

5. Gripper (1) according to claim 1, characterized in that two of the guide tongues (6, 7) are positioned near the ends of the clamping parts (2, 3).

6. Gripper (1) according to claim 1, characterized in that the length of the guide tongue (6, 7) and the guide recess (4, 5) is selected such that a part of the guide tongue (6, 7) remains in the respective guide recess (4, 5) when the clamping parts (2, 3) are moved relative to each other.

7. Gripper (1) according to one of the preceding claims, characterized in that the clamping sections (2, 3) are interconnected by means of at least one intermediate elastic element (11).

8. Gripper (1) according to claim 7, characterized in that the clamping parts (2, 3) and the intermediate elastic element (11) are made of the same material.

9. The thread clamp (1) according to claim 7, characterized in that said first clamping part (2), said body (8) and said intermediate elastic element (11) are made in one piece.