Textiles: weaving – Weft manipulation – Weaving with stationary weft supply
Patent
1990-08-30
1991-12-17
Falik, Andrew M.
Textiles: weaving
Weft manipulation
Weaving with stationary weft supply
226 97, D03D 4734
Patent
active
050727605
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a device for drawing a yarn into the weft accumulator of a loom, weft yarn being stored in turns on a stationary drum of the accumulator.
German utility model specification No. G 87 12946.9 discloses an accumulator of this kind in which a number of blowing nozzles and yarn-guiding elements or, for example, troughs are provided to facilitate automatic threading of the weft yarn.
However, the techniques which have been used to automatically thread a weft yarn onto an accumulator have been rather cumbersome and complex.
Accordingly, it is an object of the invention to provide a relatively simple device for threading a weft yarn into an accumulator.
It is another object of the invention to simplify the technique required for threading a weft yarn onto a weft yarn accumulator for a loom.
Briefly, the invention is directed to a weft accumulator having a rotatable hollow shaft with a winding tube extending angularly therefrom for passage of a weft yarn therethrough, a storage drum for receiving and winding a weft yarn from the winding tube thereon and a yarn eye spaced coaxially from the drum in order to receive a weft yarn therefrom. In accordance with the invention, a bent tube extends over the storage drum from the winding tube to adjacent the yarn eye for conveying a weft yarn therebetween. In addition, the bent tube has a longitudinally extending slot facing the storage drum in order to permit a yarn to pass therethrough from within the tube onto the drum.
In addition, an injector is positioned at an upstream end of the hollow shaft in order to inject a weft yarn into the hollow shaft and, thus, through the winding tube into the bent tube. The injector includes an entry eye coaxial of an upstream end of the shaft and a chamber between the entry eye and the shaft for receiving and directing a flow of compressed air into the hollow shaft while creating a suction force in the entry eye for drawing a weft yarn positioned thereat into the entry eye and the hollow shaft. A compressed air line is also connected to the injector for supplying compressed air thereto. In addition, the injector has a valve between the compressed air line and the chamber in order to control the passage of compressed air into the chamber and, thus, into the hollow shaft.
A second injector is also positioned adjacent and downstream of the yarn eye for drawing a weft yarn through the yarn eye. This injector cooperates with a tube which extends therefrom coaxially of the yarn eye for receiving a weft yarn. In addition, a compressed air line is connected to the second injector for supplying compressed air thereto.
The bent tube for deflecting the weft yarn extends from the exit cross-section of the winding tube on the periphery of the accumulator drum to a yarn eye disposed in prolongation of the drum axis and is slotted on the side near the accumulator.
It is therefore possible, using just a single injector nozzle, to bring the weft yarn reliably as far as the yarn eye after the accumulator without further elements of the device having to be operative inside the accumulator.
These and other objects and advantage of the invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings wherein:
FIG. 1 is a view in partial longitudinal section of a weft accumulator according to the invention, and
FIG. 2 is a section through the injector at the entry to the weft accumulator.
A weft accumulator 4 of known kind, for example, the accumulator known from DE-OS 3 123 760, is used. Weft yarn 2 is introduced on the axis of weft accumulator 4 into a bore 413 in a shaft 41, then deflected into a winding tube 41' whence yarn 2 is deposited in a number of turns W on an accumulator drum 400. Shaft 41 is driven by a controlled electrical drive (not shown) inside a casing 40', the same being mounted on a frame 40. The drum 400 is stationary and is mounted on the shaft 41 by way of bearings 412 and in casing 40' by way of bearings 411. On the draw-off side (on the right in FI
REFERENCES:
patent: 3834600 (1974-09-01), Benchemoul
patent: 4002190 (1977-01-01), Sevcik et al.
Falik Andrew M.
Sulzer Brothers Limited
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