Textiles: manufacturing – Warp preparing or handling – Machine replenishing
Patent
1992-07-01
1994-10-18
Crowder, Clifford D.
Textiles: manufacturing
Warp preparing or handling
Machine replenishing
282031, B65H 6700
Patent
active
053555660
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a machine for the automatic drawing-in of warp threads into the harness of a weaving machine from a warp-thread layer, having an apparatus for selecting the individual warp threads of the warp-thread layer, which apparatus has a separating member, and an apparatus for presenting the selected warp threads to a drawing-in member.
BACKGROUND OF THE INVENTION
In the drawing-in machine USTER DELTA (USTER being a registered trademark of Zellweger Uster AG) described in U.S. Pat. No. 3,681,825, the selected warp threads are presented by first being laterally deflected in the plane of the warp-thread layer and then being pressed by a finger-like member into a position in which they are received by the drawing-in member. This finger-like member is adjustable in stroke in the longitudinal direction of the warp threads. In this arrangement, the thread is held at its cut-off top end by a clamp. During the presentation, the thread is clamped between its bottom end, held by a clamping rail of the drawing-in frame, and its top end, held by the said clamp. The finger-like member presses laterally against the clamped thread and slides along the latter.
As soon as the drawing-in member, formed by a hook, has taken hold of the thread presented to it, the top clamp opens and the thread falls downwards in an uncontrolled manner. At the same time, the thread is drawn in, the drawing-in taking place as a so-called "loop drawing-in".
For several reasons, this known type of thread presentation is in need of improvement. On the one hand, the positioning of the thread in the receiving position by the finger-like member sliding along the thread is not very gentle on the thread and can possibly lead to breaking of the thread. Then the thread falling downwards in an uncontrolled manner can get caught, which would likewise lead to a fault. Finally, since a plurality of threads cannot of course fall downwards at the same time, the drawing-in frequency and thus the working speed of the drawing-in machine are limited.
SUMMARY OF THE INVENTION
An object of the invention is to provide an apparatus for thread presentation which treats the thread as gently as possible and ensures full control of the thread. Another object of the invention is to provide apparatus in which a higher drawing-in frequency is possible.
These objects are achieved according to the invention in an apparatus for presenting the warp threads which has a drivable transport clamp for the controlled transport of each separated thread end to a position to be received by the drawing-in member as well as first means for controlling the thread during the transport operation.
Unlike the known presentation apparatus, the thread does not fall freely downwards after the separation. Instead, it is transported downwards in a positive manner by the transport clamp. Since the thread is fully under control over its entire length in the process, faults caused by the thread getting caught are impossible. The use of the transport clamp opens up the possibility of transporting a plurality of threads simultaneously in a staggered manner to the receiving position and of thereby increasing the drawing-in frequency.
A preferred embodiment of the apparatus according to the invention is characterised by controlled positioning means, arranged at the receiving position, for the thread in the area of its separated end, and by second means for controlling the thread during the drawing-in.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention is described in greater detail below with reference to an exemplary embodiment and the drawings, in which:
FIG. 1 shows a perspective overall representation of a drawing-in machine according to the invention,
FIGS. 2a and 2b and 3a and 3b show a representation of the thread-presentation apparatus of the drawing-in machine of FIG. 1 in two views; and
FIG. 4 shows a detail of FIG. 3b.
DETAILED DESCRIPTION OF ILLUSTRATED EMBODIMENTS
According to FIG. 1, the drawing-in machine consists of a mounting stand 1 and various subassembl
REFERENCES:
patent: 4910837 (1990-03-01), Fujimoto et al.
patent: 5099555 (1992-03-01), Okuda
patent: 5134759 (1992-08-01), Hacker et al.
Eglseer Hermann
Wilhelm Hans
Crowder Clifford D.
Worrell Jr. Larry D.
Zellweger Uster AG
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