Textiles: manufacturing – Warp preparing or handling – Machine replenishing
Patent
1992-12-18
1994-06-07
Crowder, Clifford D.
Textiles: manufacturing
Warp preparing or handling
Machine replenishing
28208, 28212, 269 49, 269 543, D03J 116
Patent
active
053177908
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a clamping device for a plane thread layer, having a fixed clamping rail and a clamping member which is adjustable relative to said clamping rail.
Such clamping devices are used, for example, in warp thread feed-in machines and in warp tying machines to clamp the warp threads. They generally comprise a clamping rail extending over the entire width of the warp and a rod-shaped clamping comb held in or on the clamping rail, said clamping comb being pressed from above into and then interlocked with the clamping rail. During the dismantling process after the tying operation, the clamping rail or the clamping comb has to be removed laterally after release of the clamp.
If said clamping device is to be used during the warp change in a power loom, then for spatial reasons alone lateral removal of the clamping comb and/or clamping rail is very awkward to arrange. Furthermore, the clamping rail would also have to be provided in a suitable manner at the clamping point, which would require either lateral insertion prior to clamping or a permanent arrangement on the power loom. The former has the drawbacks already mentioned with regard to the clamping comb and a permanent arrangement on the power loom would lead to unacceptable clogging of the clamping rail with dirt and dust. Moreover, a permanent arrangement of the clamping rail on the power loom would incur not inconsiderable additional costs.
Taking this train of thought one step further towards the idea of in some way automating the warp change or at least taking it some way towards automation, it becomes clear that such a development would be very much hampered by the known clamping devices because lateral insertion and removal of the clamping rail and/or clamping comb do not lend themselves at all well to automation.
The aim of the invention is therefore to indicate a clamping device of the type described initially, which is much easier to operate and also lends itself more to automation than the above-mentioned known devices.
Said aim is achieved according to the invention in that the clamping member comprises a plurality of adjacent clamping elements having a bow- or wing-like clamping part which is swing-adjustable between an insertion position into the thread layer and a clamping position for the thread layer.
The invention therefore proposes an, as it were, unilateral clamping device, i.e. one where only one side of the thread layer need be accessible. This, as distinct from the known clamping devices where clamping rail and clamping comb in their starting position are disposed at either side of the thread layer. Said unilateral clamping device comprises on the one hand a fixed clamping rail and on the other hand clamping elements which are supported on said clamping rail and are adjustable between two swivelling positions.
In the so-called insertion position, the clamping elements may be inserted from one side into the thread layer. When, after passing through the thread layer, they are swivelled into the clamping position, they then engage round the thread layer from the other side and form, together with the clamping rail, a clamping gap which is closed upon return movement of the clamping elements towards the clamping rail.
Since, in the clamping device according to the invention, only a single member has to be moved relative to the thread layer and said member may moreover be equipped relatively easily with the drive means required for the clamping process, the device is easier to operate and lends itself more to automation than the known clamping devices.
The invention further relates to a use of said clamping device for clamping a warp thread layer.
Said use is characterized by the following measures: thread layer; clamping member in insertion position, towards the thread layer until the clamping elements pass through said thread layer; return movement towards the clamping rail in order to close the clamping gap formed between clamping elements and clamping rail and embracing the thread layer at both sides.
The inven
REFERENCES:
patent: 938130 (1909-10-01), Dorr
patent: 991640 (1911-05-01), Peterson
patent: 1079470 (1913-11-01), Colman
patent: 1479962 (1924-01-01), Hand et al.
patent: 2482155 (1949-09-01), Crandall
patent: 4175734 (1979-11-01), Williams
patent: 5109582 (1992-05-01), Okuda
Calvert John J.
Crowder Clifford D.
Zellweger Uster AG
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