Textiles: manufacturing – Warp preparing or handling – Machine replenishing
Patent
1993-05-12
1994-12-20
Crowder, Clifford D.
Textiles: manufacturing
Warp preparing or handling
Machine replenishing
28212, B65H 6700
Patent
active
053736141
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a clamping device for a sheet-like yarn layer, with a fixed clamping rail and with a clamping member adjustable relative to the latter.
BACKGROUND OF THE INVENTION
Clamping devices of this type are used, for example, in warp-yarn drawing in machines and in warp tying-in machines for clamping the warp yarns. They consist, as a rule, of a clamping rail extending over the entire width of the warp and of a rod-shaped clamping comb which is held in the clamping rail or on the latter and which is pressed into the clamping rail from above and then interlocked with this. During stripping off after the tie-in, the clamping rail or the clamping comb has to be drawn out laterally after the clamping has been released.
When this clamping device is to be used during the warp change on the weaving machine, the lateral moving out of the clamping comb and/or of the clamping rail then becomes very complicated, if only for reasons of space. Moreover, the clamping rail would also have to be provided in a suitable way at the clamping point, for which purpose either a lateral pushing in before the clamping or a permanent arrangement on the weaving machine would be necessary.
The former has the disadvantages already mentioned with regard to the clamping comb, and the permanent arrangement on the weaving machine would lead to an unacceptable contamination of the clamping rail with dirt and dust. Furthermore, the permanent arrangement of the clamping rail on the weaving machine would entail appreciable additional costs.
Now if we conceive the idea of going a further step and imagine automating the warp change in any way or at least developing it further towards automation, then it becomes clear that a development of this kind would be greatly impeded by the known clamping devices, particularly because the lateral moving in or out of the clamping rail or clamping comb is extremely difficult to automate.
SUMMARY OF THE INVENTION
Now the invention is to provide a clamping device of the type mentioned in the introduction, the handling of which is substantially simpler and also easier to automate than in the known devices mentioned above.
This object is achieved, according to the invention, in that the clamping member contains a clamping comb insertable into the yarn layer and having clamping lamellae which have a clamping edge assigned to the clamping rail. A reed comb which is insertable into the yarn layer is also provided, and the reed comb and the clamping comb are longitudinally adjustable relative to one another. The adjustment travel amounts to a multiple of the division of the lamellae of one of the combs.
The invention therefore proposes a one-sided clamping device, that is to say one in which only one side of the yarn layer need be accessible. This is in contrast to the known clamping devices, in which the clamping rail and clamping comb are arranged on both sides of the yarn layer in their initial position. This one-sided clamping device contains, on the one hand, a fixed clamping rail and, on the other hand, the clamping comb being adjustable relative to the latter and insertable into the yarn layer.
A preferred embodiment of the clamping device according to the invention is characterised in that the clamping comb is made fixed and the reed comb is made longitudinally adjustable, and in that the adjustment travel of the latter amounts to more than double the division of the clamping lamellae.
A clamping gap is formed between the clamping lamellae and the clamping rail in the so-called insertion position. When the clamping comb is inserted into the yarn layer, the yarns of the yarn layer which are oriented parallel to the clamping lamellae lie on the clamping rail. The reed comb, likewise inserted into the yarn layer, is then displaced approximately 10 to 20 millimeters in the longitudinal direction of the clamping comb. The yarns are thereby deflected at the clamping lamellae and are drawn laterally into the clamping gap formed between each clamping lamella and
REFERENCES:
patent: 2972796 (1961-02-01), Block
patent: 3741836 (1973-06-01), Williams
patent: 4409710 (1983-10-01), Kofler
patent: 4420861 (1983-12-01), Kofler
patent: 5032214 (1991-07-01), Kile
patent: 5109582 (1992-05-01), Okuda
Crowder Clifford D.
Worrell Jr. Larry D.
Zellweger Uster AG
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