Filling yarn stretching device for a loom

Details Filling yarn stretching device for a loom Filling yarn stretching device for a loom

1998-04-02

2000-01-18

Falik, Andy

Textiles: weaving

Weft manipulation

Tensions

1391161, D03D 4730

Patent

active

060149906

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

a) Field of the Invention
The invention relates to a device for stretching an inserted filling-yarn, in particular for an airjet loom, and comprising a channel adjoining a filling-yarn insertion-conduit of a reed, a blow nozzle discharging into said channel and pointing to a branch channel which intersects in substantially a perpendicular manner said channel and which comprises at least one filling-yarn deflecting location.
b) Related Technology
As regards airjet looms, a device to stretch the inserted filling yarn (here-after filling) is mounted at the end of the filling insertion conduit formed by a plurality of reed lamellas in order to prevent the filling from recoiling after being inserted. Such devices are fitted with a channel running as a straight extension of the filling insertion conduit, a blow nozzle issuing into said channel and pointing at a branch channel intersecting substantially perpendicularly into the channel. A deflection location is located at the inlet of the said branch channel which also can be made to return to the channel along a curved path (EP 0 493 847 A1).
The objective of the invention is to improve a device of the above kind.
This problem is solved in that the at least one deflection location consists of a wear-resistant element mounted substantially transversely to the filling's direction of insertion.


BRIEF SUMMARY OF THE INVENTION

The invention is based on the consideration that the deflection location(s) are subject to wear caused by the filling running over it (them), whereby, after a given time of operation, the effect of the device will change and possibly the filling entering the device and held in it will be damaged. Because of the wear-resistant element(s) at the deflection location(s), constant and proper operation is assured by the said element(s) at the deflection location(s) and at the same time the danger of damaging the fillings is reduced.
In a preferred embodiment of the invention, the branch channel follows a curved path and joins again the channel. Two wear-resistant elements, each forming a deflection site for the filling, are mounted at the inlet of the branch channel. In this embodiment the filling's friction at the deflection locations and the applied pneumatic forces oppose filling-recoil, whereby the extant conditions also are preserved over a substantial length of operation because the deflection locations are wear-resistant elements and thereby do not incur any significant wear even over lengthy operation.


DESCRIPTION OF THE DRAWINGS

Further advantages and features of the invention are elucidated in the following description of the embodiment schematically shown in the drawing.
FIG. 1 is a partial view of an airjet loom with a section of a stretching device of the invention,
FIG. 2 is a cross-section of the stretching device approximately along line II--II of FIG. 1, and
FIG. 3 is an enlarged detail F3 of FIG. 1.


DETAILED DESCRIPTION

The stretching device 1 is mounted together with a reed 3 on a batten 2. The reed 3 consists of a plurality of lamellas forming a unilaterally open U-shaped filling insertion conduit 4.
The stretching device 1 comprises a housing fitted with a main filling yarn receiving channel 5 directly adjoining the exit end of the filling insertion conduit 4 of the reed 3, said housing also having a U-shaped cross-section substantially corresponding to the filling insertion conduit 4 and running along the insertion direction A from its inlet as an extension of the filling insertion conduit 4.
A branch channel 6 intersects the channel 5 directly behind its inlet and the first segment of said branch channel runs approximately perpendicularly to the channel 5 away from the batten 2 and then merges at an approximately cylindrical curvature to and intersecting a second segment returning into the channel 5. A first blow nozzle 8 discharges towards the inlet orifice of the branch channel 6 and also discharges into the lower side 13 of said channel 5 somewhat offset from the insertion conduit 4 and

REFERENCES:
patent: 4936353 (1990-06-01), Volland et al.
patent: 4976292 (1990-12-01), Matsumoto
patent: 5091246 (1992-02-01), Yasui et al.
patent: 5226458 (1993-07-01), Bamelis
patent: 5606998 (1997-03-01), Wahhoud et al.
patent: 5735316 (1998-04-01), Hehle

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