Textiles: weaving – Weft manipulation – Weaving with stationary weft supply
Patent
1980-02-12
1983-02-01
Jaudon, Henry
Textiles: weaving
Weft manipulation
Weaving with stationary weft supply
D03D 4730
Patent
active
043710077
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to an apparatus on textile looms using a fluid for guiding and transporting the weft yarn in the shed in a channel formed by yarn guides.
BACKGROUND OF THE INVENTION
Known apparatus for performing such operations, in which the yarn guides forming the weft transport channel are fixedly connected to the sley and have a "C", or "V" shaped cross section of the channel with an opening towards the reed side, are disclosed for example in German patent documents Nos. 2,622,148 and 2,608,030.
A channel terminating with a rounded portion and in its vertical clearance tapering away from the reed plane, offers an optimum weft thread transport with low energy requirements.
However, the weaving speeds are limited then by the allowable speed of the devices required for forming the shed, so that it is necessary with increasing weaving speeds to reduce the lift of the shed in order to reduce the inertial forces.
This is achieved by reducing the height of the channel perpendicular to the bisecting plane of the upper and lower yarn threads of the shed.
Therefore the known yarn transport channel has a slim "V" or "C" shaped cross section and the legs of the "V" or "C" are nearly parallel to the warp threads when the shed is opened. A slim "V" means that the angle between the upper and lower legs of the "V" is small and so the height of the channel is also small.
The problem of such a channel is the introduction into the warp threads of the lower yarn.
In known apparatus, the upper yarn guide leg enters the group of warp threads of the lower shed, completing this separation via the lower leg of the yarn guide.
The angle between the lower leg of the "V" and the warp threads of the lower shed is important for troublefree penetration of the yarn guide into the shed. In case of a certain lateral displacement of the warp threads, and a lower leg of the "V" being almost parallel to the lower yarn of the shed, there is a danger that the warp threads may not slide down to the bottom of the guides, but will be positioned in crossed manner over the lower leg of the "V".
This lateral displacement may particularly happen in the case of large weaving widths and especially in the vicinity of the stretcher.
Such a warp thread, which is caught on the lower leg of the "V" will cause picking faults because it influences the fluid stream by exposing its filaments to the channel.
SUMMARY OF THE INVENTION
According to the invention, for a reliable, troublefree introduction into the warp threads, two different yarn guide configurations are used in a channel.
The transport channel contains first yarn guides, which form the upper leg of the V-shaped channel and second yarn guides, which form the lower leg of the "V". Viewed in the direction of the weft insertion, both types of yarn guides together form a V-shaped cross section of the channel. The cross section of the channel has a rounded termination between the two legs of the "V" which is unitary with the upper leg of the "V" and therefore is part of every first yarn guide. The second yarn guides are spacedly arranged between the first yarn guides.
As a result of this novel arrangement of the first and second yarn guides, the penetration of the lower leg of the "V" cannot cause a caught lower yarn. The second yarn guides, being separate from the first yarn guides, allow the yarn to slide down to the bottom of the yarn guides. If there is no yarn caught on the lower leg of the "V" and thus exposed to the fluid stream and weft, no picking fault can be caused.
BRIEF DESCRIPTION OF THE DRAWING
The above and other features and advantages of the invention will become more readily apparent from the following description, reference being made to the accompanying drawing, in which:
FIG. 1 is a side view of the picking apparatus according to the invention.
FIG. 2 is a front elevational view of the apparatus of FIG. 1;
FIG. 3 is a top view of the apparatus of FIG. 1;
FIG. 3a is a sectional view taken along line A--A of FIG. 3;
FIG. 3b is a sectional view
REFERENCES:
patent: 1721940 (1929-07-01), Ballou
patent: 3847187 (1974-11-01), Buran et al.
Jaudon Henry
Ross Karl F.
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