Device for stretching and tensioning a weft yarn

Details Device for stretching and tensioning a weft yarn Device for stretching and tensioning a weft yarn

2000-01-03

2001-04-24

Falik, Andy (Department: 3741)

Textiles: weaving

Weft manipulation

Tensions

Reexamination Certificate

active

06220308

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to an apparatus for the stretching and tensioning of a weft thread for an air jet loom in accordance with the preamble of claim
1
and to a loom with such an apparatus.
2. Description of the Prior Art
In DE-A-32 00 637 an air jet loom is described having a weft thread monitor and a clamping apparatus for the stretching and holding taut of a weft thread up to beat-up. This apparatus has a body with a half open recess the one boundary surface of which has an air entry opening and the other boundary surface of which has an air outlet opening. The two openings lie opposite to one another and are connected to an air supply line and/or to an air suction line respectively so that an air flow can be produced in the recess transverse to the weft direction. Through this air flow the end section of a weft thread to be inserted is engaged after flying through the thread monitor and deflected into the air suction line. It has proved to be a disadvantage of these devices that only a directed air jet is provided for the thread deflection.
The invention is based on the object of improving the stretching and tensioning of a weft thread.
SUMMARY OF THE INVENTION
This and other objects of the present inveniton, which will become apparent hereinafter, are achieved by providing a nozzle having at least one nozzle hole and which is adjustably arranged in the weft direction relative to a closed channel for reception of a deflected web thread.
The invention has the advantages that, on the one hand, the nozzle produces two air jets which form an air curtain and that, on the other hand, the nozzle is adjustable relative to the channel. In this way a thread deflection is guaranteed independent of the type of thread and the weft thread is held reliably taut.
In the following the invention will be explained with reference to the accompanying drawings.


REFERENCES:
patent: 3744533 (1973-07-01), Yano et al.
patent: 4487236 (1984-12-01), Gunneman
patent: 4838321 (1989-06-01), Ishido et al.
patent: 5224521 (1993-07-01), De Jager
patent: 5226458 (1993-07-01), Bamelis
patent: 5333651 (1994-08-01), Riezler
patent: 5735316 (1998-04-01), Hehle
patent: 4118411 (1992-08-01), None
patent: 4443371 (1996-01-01), None
patent: 2971148 (1997-09-01), None
patent: 2353664 (1977-12-01), None
patent: 2497841 (1982-07-01), None
patent: 2081753 (1982-02-01), None

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