Textiles: weaving – Miscellaneous – Loom cleaning
Reexamination Certificate
2000-05-30
2001-09-18
Falik, Andy (Department: 3765)
Textiles: weaving
Miscellaneous
Loom cleaning
C139S086000, C015S301000
Reexamination Certificate
active
06289937
ABSTRACT:
CROSS REFERENCE TO RELATED APPLICATION
This application claims the priority of Swiss Application No. 1999 1009/99 filed May 30, 1999, which is incorporated herein by reference.
BACKGROUND OF THE INVENTION
This invention relates to a method for maintaining clean the return springs in a shed-forming apparatus in a weaving machine. The warp threads guided in healds between an upper shed position and a lower shed position are moved back and forth and at each heald a tension spring exerts a pulling force for resetting the healds into the lower shed position. The return springs are secured to a lowering floor or to lowering bars of a lowering frame.
Well-known shed-forming apparatuses are, among others, the so-called Jacquard machines where two hooks are connected to one another by a common block-and-tackle. The hooks may be coupled, for example, by magnetic means, to two continuously oppositely moved bars, whereby the heald suspended on the block-and-tackle executes, together with the warp thread, a controlled vertical motion between an upper shed position and a lower shed position. Each heald is connected to a tension spring which resets the heald into the lower shed position. The tension springs are secured to the lowering floor or to the lowering bars of a lowering frame.
A significant problem involved in machines of the above-outlined type is a dust deposition and lint formation on the return springs which rapidly leads to operational disturbances and requires long down periods of the machine for performing maintenance work.
SUMMARY OF THE INVENTION
It is an object of the invention to provide a method and a device which ensure a cleaning of the tension springs and effectively prevent dust deposition or lint formation thereon, whereby down periods caused by malfunctioning are practically eliminated.
This object and others to become apparent as the specification progresses, are accomplished by the invention, according to which, briefly stated, the shed-forming apparatus for a weaving machine includes warp thread guiding healds reciprocated vertically between an upper shed position and a lower shed position; a lowering frame; and return springs attached to each heald and to the lowering frame to reset the healds into the lower shed position. The lowering frame supports a channel through which an air stream is forced. The return springs are coupled to the channel for exposing the return springs to a pressure of an air flow to prevent dust deposition and lint formation on the return springs.
According to a preferred embodiment for performing the method of the invention, the tension springs may be directly or indirectly coupled at the lowering frame to a pneumatic channel communicating with a source of pressurized air.
Further, the pressurized medium flowing through the channel may have a uniform pressure level or it may be regulated, particularly to compensate for air leakages.
In the shed-forming apparatus which incorporates the invention, the warp threads, guided in healds, are movable back and forth between an upper shed position and a lower shed position. For returning the healds into the lower shed position, to each heald a tension spring is connected which is secured to a lowering floor or to the lowering bars of a lowering frame.
Thus, according to the invention, the shed-forming apparatus has a channel, situated on the lowering frame, for guiding pressurized air therein. The tension springs are directly or indirectly exposed to the air flow, whereby dust deposition and lint formation on the tension springs are prevented.
Preferably, the pressurized air channel may be bordered on the lowering frame on the top by the lowering floor with the intermediary of sealing and spring means.
According to a further advantageous feature, the channel bottom is height-adjustable to vary the flow passage cross section of the channel and to thus alter the pressure of the air flow. Further, the tension springs may be directly or indirectly connected in a flow-tight manner with the lowering floor as part of the pressurized air channel or the tension springs may be indirectly coupled to the channel by means of tubular intermediate pieces secured to the lowering floor.
REFERENCES:
patent: 4570682 (1986-02-01), Bachmann
patent: 5361807 (1994-11-01), Giovenzana
patent: 5608961 (1997-03-01), Piegeler
AGM Jactex AG
Falik Andy
Kelemen Gabor J.
Venable
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