Ancillary air jet arrangement in the reed weft channel of an air

Details Ancillary air jet arrangement in the reed weft channel of an air Ancillary air jet arrangement in the reed weft channel of an air

1995-05-23

1997-06-24

Falik, Andy

Textiles: weaving

Weft manipulation

Weaving with stationary weft supply

D03D 4730

Patent

active

056410026

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The known methods of weft thread insertion into the shed of an air-operated jet loom, as disclosed, e.g., in U.S. Pat. No. 3,911,968 or GB 1,333,948 use a profile swinging loom reed with a direct pick channel, and a pneumatic system consisting of a main pick jet and a series of geometrically arranged ancillary jets for controlling the weft thread during the weaving process. The improvement of the efficiency of the ancillary jets is directed in particular to increase the reliability of the pick of the weft thread thrown into the shed of the warp threads, to reduce the consumption of air and, as the case may be, of electric power as well, and to increase the pick speed of the weft thread. In general terms, the dominant aim is to achieve a top-quality weft thread pick, this quality being under the existing circumstances a fundamental criterion having a decisive influence both on the economy and on the quality of the weaving process.
The known device for inserting the weft thread into the shed of an air-operated loom, schematically shown in FIG. 1, contains a profile loom reed P in which there is provided, approximately in the middle between the upper and the lower weave of the system of flat profile reed dents PT, free space for the weft thread pick, referred to as pick channel K. The open side of the pick channel K is situated in the direction of the tangent to the periodical swinging movement of the batten B in which the loom reed P is fixed. During the forward movement of the loom reed P towards the cloth, the rear closed side of the pick channel K carries the weft thread, and in the tangent direction of the movement of the batten B beats-up the weft thread to the cloth face.
The action of the pneumatic system of the loom creates a stream of the carrying medium imparting its motion energy to the weft thread being picked in the pick channel of the profile loom reed. This imparting action takes place only in a definite interval of the operation cycle of the loom when the area of the pick channel is not covered with warp threads or, in other words, when the shed is open. This time interval is often referred to as picking angle, if its magnitude is expressed in grades indicating the amount of turning motion of the main shaft of the loom. The performance of the loom is then directly proportionate to the magnitude of the picking angle and to the speed of the weft thread picking.
The speed of the weft thread picking depends on the quality of the speed field of the carrying substance, e.g. of air, in the pick channel K, produced by the ancillary jets T, situated at a predetermined interval along the loom reed P in the direction of the loom width. The quality of the speed field of the carrying substance is influenced by the concrete form of the ancillary jet T, outlet coefficient (factor) dispersion, etc., and also by the location of the outlet aperture V of the ancillary jet T, i.e., by the position of the axis OV of the outlet aperture, corresponding to the axis of the stream of the carrying substance streaming out, with respect to the axis OK of the pick channel K of the loom reed P. Under these conditions, the ancillary jets T are seated under the shed axis and are fixed to the batten B of the loom in such a manner that during the periodical swinging movement of the loom reed P carrying batten B they do not prevent the picked weft thread from being beaten-up to the cloth face and bound by the warp threads.
To further define the influence of this arrangement of the air-operated jet looms with profile loom reeds used, the following facts about the action of the carrying substance, e.g., of an air stream, on the weft thread under the pick conditions are provided.
The relations describing the action of the air stream on the weft thread immersed in, and surrounded by, the air stream, lead to the conclusion that the magnitude of the resultant of the vector sum of the outer forces acting in a certain direction on a length element of the weft thread is a function of the flow momentum. The l

REFERENCES:
patent: 4031926 (1977-06-01), Zollinger et al.
patent: 4344465 (1982-08-01), Husegawa et al.
patent: 4354533 (1982-10-01), Suzuki et al.

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