Textiles: weaving – Weft manipulation – Weaving with stationary weft supply
Patent
1990-01-31
1991-07-16
Falik, Andrew M.
Textiles: weaving
Weft manipulation
Weaving with stationary weft supply
1394355, D03D 4730
Patent
active
050316729
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a nozzle control device for an air jet weaving loom with a weft thread insertion by one or more main nozzles and by a plurality of relay nozzles arranged along a weft thread insertion air channel.
BACKGROUND INFORMATION
The weft thread insertion in conventional air weaving looms takes place through one or several main nozzles, whereby each main nozzle is coordinated with one yarn. The main nozzles are arranged in bundles and so centered on the air insertion channel that each time one yarn can be carried into the air insertion channel.
The yarn is transported through the weft thread insertion air channel in that an air guiding of the weft thread through the insertion air channel takes place by means of relay nozzles arranged in a row along the insertion air channel through the weaving reed.
Heretofore, the relay nozzles have been controlled in sequence in an impulse type manner, so that the thread tip was seized by the air stream for pulling the thread through the insertion air channel.
It has been a disadvantage in conventional controls of the relay nozzles in air weaving looms that the impulse duration of the control of the relay nozzles had to be adjusted to the thickest thread which is least air effective. It was necessary to take care that the heaviest thread was still sufficiently exposed along its length to the air flow, so that even the thickest thread achieved the speed sufficient for its transport through the insertion air channel. Supplying air in accordance with the requirements of the heaviest thread has the disadvantage that, if less heavy yarns are simultaneously woven, these lighter more air effective yarns receive too much air, whereby the excess air is wasted. On the one hand, the wasted air caused a disadvantageously high air consumption and, on the other hand, it involved the danger of damaging the yarn. In bad cases it was no longer possible to weave substantially different yarns into the same fabric.
OBJECTS AND SUMMARY OF THE INVENTION
It is an object of the invention to further develop the control device of the relay nozzles of an air weaving machine in such a manner that in sequential work steps substantially different yarns can be woven with a high quality.
For achieving the above object the invention is characterized in that the relay nozzles are controlled in groups and in that the air impulse duration of the control device is controlled in a closed loop manner in response to the air effectiveness of the respective yarn being woven, whereby said air effectiveness or its relevant parameter is currently measured automatically and the respective signal is used in said closed loop control for controlling said air impulse duration.
The ratio of the supporting surface of the yarn in air, relative to the yarn mass is defined as a parameter of the air effectiveness. Thus, it becomes clear that light yarns require a different control of the air nozzles than comparatively heavy yarns.
According to a further embodiment of the invention, a known parameter of the air effectiveness of a particular yarn type is also taken into account for the control by manual insertion of the known parameter into a control device by means of an operating terminal.
In another embodiment the current relevant parameters of the yarn are ascertained by way of a thickness measurement. Such a measurement provides information regarding the hairiness of the weft thread which is directly relevant to the air effectiveness of that weft thread. The specific or current parameters of the yarn can be ascertained capacitively by sensors measuring an electrical capacity that may change along the length of a weft thread as the latter passes through the sensor.
According to a further embodiment of the invention, the sensor output signals representing the parameters of the weft thread yarn as it is pulled off a supply spool, are supplied to an electronical control device including a computer, wherein the specific yarn parameters relating to the air effectiveness, are calculate
REFERENCES:
patent: 4463783 (1984-08-01), Suzuki et al.
patent: 4646791 (1987-03-01), Tsuji et al.
patent: 4651785 (1987-03-01), Volland et al.
patent: 4673004 (1987-06-01), Rosseel et al.
Balken Jochen
Teufel Dieter
Wahhoud Adnan
Falik Andrew M.
Fasse W. G.
Kane, Jr. D. H.
Lindauer Dornier Gesellschaft mbH
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