Weft yarn storing, feeding and measuring device for jet weaving

Textiles: weaving – Weft manipulation – Weaving with stationary weft supply

Patent

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Details

242 4701, D03D 4736, B65H 5100

Patent

active

046076689

DESCRIPTION:

BRIEF SUMMARY
The present invention relates to a weft yarn storing, feeding and measuring device for jet weaving machines, having a storage drum onto which an intermediate yarn store can be wound by a winding-on member, and from which the yarn is withdrawn spiralling around the withdrawal end of the storage drum for insertion into the shed of a jet weaving machine, at least one yarn stopping device being arranged at said withdrawal end and consisting of a stopping element and of actuator means moving said stopping element into and out of the path of the yarn being withdrawn, and an actuator control unit transmitting an actuating signal to said stopping device when a desired yarn length, adjustable in the device, has been withdrawn from the storage drum.
A known device of this kind is disclosed in the Belgium Pat. Nos. 889 255 and 889 677 (corresponding to the international patent application No. PCT/BE 82/00011).
The object of the present invention is to further increase the certainty in the prior art devices of this kind that the yarn stopping device really is actuated for stopping the yarn withdrawal in due time, i.e. in such a way that the stopping element is moved into the path of the yarn being withdrawn before the yarn withdrawal point passes the position of this stopping element and travels another withdrawal revolution around the storage drum before it is stopped by said stopping element, which latter case would mean that the inserted weft yarn would erroneously have an additional length corresponding to the circumference of the storage drum.
This object is achieved in accordance with the invention in that said actuator control unit is electrically connected to a yarn sensing detector, preferably of optical type and known per se, which is positioned at the arrival end of the shed for the weft yarn at a predetermined distance from the selvedge of the fabric being woven, said control unit thereby receiving an electric signal when the inserted weft yarn reaches the detection area of said yarn sensing detector and in response thereto generating and transmitting said actuation signal to the actuator means of said yarn stopping device for stopping the withdrawal of the weft yarn from the storage drum.
A preferred embodiment of a yarn storing, feeding and measuring device in accordance with the present invention will now be described in detail with reference to the enclosed drawings, where
FIG. 1 shows schematically the weft yarn insertion means of a weaving machine of air jet type, comprising a yarn storing, feeding and measuring device according to the invention;
FIG. 2 shows a side view of the yarn storing, feeding and measuring device itself, in partially cut- and cross-sectional representation;
FIG. 3 shows a front view of the device as shown in FIG. 1;
FIGS. 4 and 5 show details of the device shown in FIGS. 1 and 2;
FIG. 6 shows a circuit diagram of an actuator control unit of the device shown in FIGS. 1-5, and
FIG. 7 shows a flow-diagram used in a microprocessor of the actuator control unit as shown in FIG. 6.
Referring now to FIG. 1, a weft yarn WY coming from a yarn spool YS is wound onto a yarn storing, feeding and measuring device MD, which will be described below in detail with reference to FIGS. 2-5. The weft yarn WY is inserted once per weaving cycle into the shed WMS of a weaving machine of the air-jet type, well-known to the man skilled in the art, by means of actuating (opening) an air jet main nozzle MN positioned just outside the insertion end IE of the shed. The opening and closing of the nozzle MN is controlled from a first electronic control unit A, which unit also controls the opening and closing of a plurality of so called air jet relay nozzles RN1-RNn (where n can be e.g. equal to sixteen), which support the transport of the weft yarn WY up to the arrival and AE of the shed. Main nozzle and relay nozzle control systems for jet weaving machines are for example disclosed in DE-OS No. 28 36 206, as well as in Applicant's U.S. application Ser. No. 641,899 as filed on the same day as the present app

REFERENCES:
patent: 4270579 (1981-06-01), Nakanishi
patent: 4407336 (1983-10-01), Steiner
patent: 4415008 (1983-11-01), Keller et al.
patent: 4458726 (1984-07-01), Wenig
patent: 4458729 (1984-07-01), Brouwer
patent: 4527598 (1985-07-01), Walch

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