Textiles: weaving – Warp manipulation – Shedding
Reexamination Certificate
2000-06-05
2001-09-04
Falik, Andy (Department: 3741)
Textiles: weaving
Warp manipulation
Shedding
C043S024000
Reexamination Certificate
active
06283163
ABSTRACT:
The invention relates to a rod-like thread guide element for textile machines, in particular a heddle, according to the preamble of claim
1
. The invention relates, further, to a method for the production of a rod-like thread guide element according to the preamble of claim
8
.
Rod-like thread guide elements designed as heddles for weaving machines are known. Heddles of this type have a thread eye, also referred to as a loop, and are used in weaving machines in order to raise and lower warp threads, which each run through the thread eye, for the purpose of forming the shed. Heddles of this type conventionally have a split middle portion which merges into a longitudinal portion on each of the two sides, the thread eye being soldered in the middle portion.
Heddles with a soldered-in thread eye have, inter alia, the disadvantage that they are relatively costly to produce and are relatively heavy.
The object of the present invention is to propose an economically more advantageous rod-like thread guide element for textile machines.
This object is achieved by means of a rod-like thread guide element having the features of claim
1
.
Subclaims
2
to
7
relate to further advantageous embodiments of the thread guide element according to the invention.
The object is achieved, further, by means of a method for the production of a rod-like thread guide element for textile machines, in particular a heddle, having the features of claim
8
. Subclaims
9
and
10
relate to further advantageous embodiments of the method according to the invention.
The object is achieved, in particular, by means of a rod-like thread guide element for textile machines which comprises two metallic longitudinal portions merging into a middle portion, a thread eye being fastened in the middle portion by means of an adhesive. The thread guide element is designed preferably as a round wire heddle or a flat steel heddle.
A heddle with a thread eye fastened by adhesive bonding has, for example, the following advantages, as compared with a heddle having a soldered-in thread eye:
The individual heddle has a lower overall weight.
A heddle frame of a weaving machine, comprising a multiplicity of individual heddles, likewise has a lower weight and therefore, for example, can be operated at a higher rotational speed or requires less energy to operate it.
There is no need to coat the thread eye by nickel-plating or tinning, this having been necessary hitherto for soldering in the thread eye. This allows more cost-effective production and, moreover, is ecologically more advantageous. In addition, the outermost surface of the thread eye, said surface being produced by nickel-plating or tinning, was relatively soft, so that there has hitherto been the risk that the guided warp threads would cut into this outermost surface.
The thread eye has preferably a hardened surface, the surface hardness having hitherto been reduced again by the heating occurring during soldering. Such a reduction in the surface hardness no longer occurs in the case of adhesive bonding.
The adhesive has higher resistance, as compared with chemical means, such as reviving, thus resulting in the heddle having a longer service life.
There is no risk that there will be solder residues which could cut into and thereby damage a warp thread.
No nickel peaks are formed, which have hitherto been produced during final electrolytic nickel-plating when soft solder residues have been present.
The curing time of an adhesive capable of being cured by means of ultraviolet radiation is shorter, as compared with a soft solder, thus, for example, making quicker manufacture possible.
Existing manufacturing machines for heddles can be converted in a simple way in that the operation of fastening the thread eye is carried out by adhesive bonding instead of by soldering.
Another advantage of the method according to the invention is to be seen in that a thread eye which cannot be soldered or which can be soldered only with difficulty may also be used. This also makes it possible, in future, to use substantially more wear-resistant thread eyes, for example made from solid ceramic or with ceramic coatings, for example PVD (Physical Vapor Deposition) or CVD (Chemical Vapor Deposition) layers.
The thread eye may consist of metal, for example of a rustproof steel, also referred to as “stainless steel”, or of a high-alloy steel, and, moreover, may have a hardened surface, as can be achieved, for example, by case hardening, full hardening, tempering, nitriding or nitrocarbonization. The thread eye may also have an additionally applied hard layer which can be applied chemically, electrochemically or in a gas phase (PVD, CVD) . Such layers may, for example, be: chemical nickel and nickel dispersion layers or hard material layers based, for example, on (designation of the chemical elements) B, Ti, Cr, W, V, etc. or their compounds with nitrogen, carbon, oxygen, etc.
A large number of commercially available products are suitable as an adhesive. Advantageously, an adhesive is used which cures in a short time. An adhesive of this type is, for example, an adhesive which cures by being irradiated with ultraviolet light (UV light) and which cures, for example, within a time of between 0.1 and 20 seconds, for example in one second or in ten seconds. For example, a quick-curing adhesive of this type has a solidification time of 0.1 seconds and a full curing time of 10 to 20 seconds. Quick-acting adhesives which have a short curing time due to chemical or physical influences are suitable. An adhesive of this type may, for example, be produced on the base of polyester urethane acrylate.
A heddle is exposed to knocks during operation. The thread eye fastened to the heddle therefore preferably has, to some extent, elastic properties or some toughness. In order to ensure a permanent bond between the heddle and the thread eye, an advantageous adhesive likewise has some elastic properties or appropriate toughness. Moreover, the adhesive should have insensitivity to knocks.
In an advantageous embodiment, the thread eye, or at least the faces coming directly into contact with the warp threads, has a hardened surface with, for example, a nitrocarbonization depth of 20 to 50 micrometers.
After the thread eye has been fastened by means of adhesive, it may prove advantageous for the entire thread guide element, or at least the thread eye, the middle portion and the adhesive, to be covered with a metallic layer. This metallic layer is preferably applied by electroplating, for example by nickel-plating. One advantage of final nickel-plating of this type is to be seen in that the surface, in particular the surface of the rod-like thread guide element, which may also be formed from wires, has harder properties or properties which are more abrasion-resistant than the warp threads acting on it. The adhesive, which consists, in particular, of plastic, can be electroplated by means of methods known per se from other areas of technology.
REFERENCES:
patent: 2132245 (1938-10-01), Royle
patent: 3960182 (1976-06-01), Schwarz
patent: 4880290 (1989-11-01), Kumazawa et al.
patent: 5052446 (1991-10-01), Gysin
patent: 5361529 (1994-11-01), Lindler
patent: 0 403 429 (1990-12-01), None
patent: 608 426 (1926-07-01), None
patent: 1 192 175 (1959-10-01), None
patent: WO80/00719 (1980-04-01), None
Adams, Schwartz & Evans P.A.
Bracker AG
Falik Andy
LandOfFree
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