Heddle, heald frame and loom with the heald frame

Abstract

The heddle (3) for a loom (M) having at least one heddle frame (2) with two cross-members (22, 22') for attaching the heddle to has a coupling on each end with at least two thrust sections (33g, 33j) that engage simultaneously with corresponding surfaces (23g, 23j) on a traction bar (23) attached to one of the cross-members. The thrust sections are offset relative to one another on a line parallel to the heddle's lengthwise axis. The heddle coupling with the thrust surfaces has two branches (331, 332) enclosing a space (V33) to receive the traction bar, each of the branches having at least one tooth (33a, 33b, 33c, 33d) equipped with the thrust sections. Depending on the number of teeth, they can either face one another or be staggered, and in variants of the design the couplings can have different shapes, e.g. U-shaped, C-shaped or in a closed loop.

Description

technical field [0001] The invention relates to a heddle, a heald frame and a loom equipped with the heald frame. Background technique [0002] It is known to equip a weaving machine with heald frames which are vibrated vertically by means of a suitable device, for example a heddle system or a dobby. It is known to mount healds on these heald frames, each having an eyelet for the passage of the warp threads of the loom. The assembly between the heald and the hooking bar of the crossbeam of a heald frame can have various forms, as in CH-A-155094, EP-A-0302798, FR-A-2214770 and described in US-A-2461497. In the last document, it is proposed that an anti-rotation rod, distinct from the beam of the heald frame, traverses the healds supported by the heald frame. It is proposed in US-A-4519424 to introduce the ends of a heald into openings provided in the upper and lower beam elements of a heald frame. An anti-rotation device for the heald may be used. DE-A-1535847 discloses ...

AI Technical Summary

Problems solved by technology

Now, taking into account the usual operating conditions of looms in humid atmospheres, the healds and rods must be made of stainless steel material with a certain hardness limit, and the treatment to increase its hardness is expensive

Furthermore, considering the width of the heald frame division and the density of the healds across the width of the loom, the width of the surface between the beam and the heddles for contact and for transmitting traction cannot be increased

Thus, the known healds and the hook parts of the beam of the heald frame tend to wear out very quickly and lead to increased heald play and breakage

Regular preventive maintenance operations are therefore required, which leads to constant downtime of the looms involved

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