Textiles: weaving – Weft manipulation – Weaving with stationary weft supply
Patent
1994-04-19
1995-08-15
Falik, Andrew M.
Textiles: weaving
Weft manipulation
Weaving with stationary weft supply
139450, D03D 4734
Patent
active
054410878
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a yarn storage and feed device provided with directional air jet nozzles which are selectively activated to correct partial and total failure conditions caused by yarn breakage.
BACKGROUND OF THE INVENTION
In a yarn storage and feed device described in DE-A1-37 34 284, the threading device comprises direction-jet nozzles and air guidance surfaces. In case of yarn breakage, the free yarn end of the broken yarn or of a spare yarn is moved by activating all direction-jet nozzles from the inlet into the yarn storage and feed device through the winding element and then along a detour path as compared with the normal yarn path along the storage drum into the guide opening, for instance, when the drive is stopped in a predetermined position. In case of partial failure with yarn breakage between the inlet and the storage drum, one ignores the fact that a regular yarn supply from which the yarn runs correctly into the guide opening might still be present on the storage drum. Unnecessary and time-consuming extra work is performed during the threading operation, for continuous threading is only required in case of total failure with yarn breakage where the yarn stored on the storage drum has also been consumed.
In a yarn storage and feed device described in EP 0 420 176, a first direction-jet nozzle assembly that has simultaneously supplied thereto two identical threads is provided in the inlet. At least one additional direction-jet nozzle is provided between the outlet of the winding element and the guide opening. Irrespective as to whether after yarn breakage there is a partial failure in which yarn is still stored on the storage surface or whether there is total failure in the case of which the yarn stored on the storage surface has been consumed after yarn breakage, both free yarn ends of the broken one yarn are eliminated in case of failure and the other yarn is newly threaded subsequently. To eliminate yarn possibly still stored on the storage surface, the winding element is turned back and the yarn is sucked back and discharged from the first direction-jet nozzle assembly.
In a yarn storage and feed device described in EP 0 269 140, partial failure caused by yarn breakage between the reel and storage drum with at least partly correct yarn supply on the storage drum is solely remedied in an automatic way. An auxiliary nozzle moves the yarn end of the broken yarn or of a spare yarn into the inlet of the yarn storage and feed device and up to the outlet of the winding element. A cutting device separates an initial part of the yarn supply on the storage drum to create a free yarn end at this place. Suction air nozzles suck in both yarn ends before a splicer connects the yarn ends. This principle presupposes an operation control device that quickly responds to yarn breakage. The threading device is not capable of eliminating total failure with an empty storage drum.
SUMMARY OF THE INVENTION
It is the object of the present invention to provide a yarn storage and feed device of the above-mentioned kind wherein unnecessary extra work can be avoided when the failure is eliminated and partial failure with yarn breakage can be remedied more rapidly than total failure. Under another aspect there is to be provided a yarn storage and feed device which is intelligent as to failure elimination and which is capable of classifying the respective type of failure and of eliminating the failure in a specific way within as little time as possible and, optionally, in an automatic way.
The above object is attained according to a first embodiment of the invention which utilizes a compressed-air conveying system including direction-jet nozzles. At least one direction-jet nozzle is arranged in a first section between a point of inlet into the device and an outlet, while at least one direction-jet nozzle is arranged in a second section between the outlet and a guide opening for the yarn. By means of an activating device, which determines whether a total or partial failure occ
REFERENCES:
patent: 5072760 (1991-12-01), Kaufman
patent: 5094275 (1992-03-01), Shaw et al.
patent: 5109891 (1992-05-01), Maina
patent: 5181544 (1993-01-01), Deiuri
Alberyd Ake
Hellstrom Jerker
Falik Andrew M.
Iro AB
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