Process and device for open-end friction spinning
AssigneeSchubert & Salzer
InventorWerner Billner
Life of this patent
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Abstract
In an open-end friction spinning process provisions are made for the fibers to be fed tangentially onto the surface of a hollow friction roller, at an angle to the longitudinal axis of said roller, whereby the fibers reach the spinning wedge in this position. In this manner, the fibers are arranged at a predetermined angle as they go from the fiber feeding channel to the spinning wedge and are brought into contact with the yarn end in this position which facilitates the joining process.
Claims16
A process for open-end friction spinning yarn where carded fibers are fed into the spinning wedge formed by two friction rollers, at least one of which is hollow and has a perforated surface and suction means to draw fibers onto said perforated surface and to hold said fibers on said perforated surface and to convey said fibers into the spinning wedge to form a yarn generating line, comprising the steps of:
- (a) carding said fiber to separate and to orient said fibers along their longitudinal axis;
- (b) conveying said separated and oriented fibers in an air current to the surface of said hollow roller;
- (c) depositing said oriented and separated fibers in the direction of rotation and tangentially onto said perforated surface of said friction roller, with the longitudinal axes of said fibers generally extending at an acute oblique angle to the generating line of said hollow friction roller, said angle also being acute with said generating line adjacent the end of said hollow friction roller opposite one end of said roller from which the twisted yarn is withdrawn;
- (d) conveying said deposited fibers into the spinning wedge while maintaining said fibers on said perforated surface at the angle at which they were deposited thereon;
- (e) twisting said fibers into yarn;
- and
- (f) withdrawing said yarn from said one end of said roller.
An open-end friction spinning apparatus for spinning yarn from fiber comprising:
- (a) a pair of friction rollers, driven in the same direction about parallel longitudinal axes, forming a spinning wedge where the surfaces of said friction roller are adjacent to each other, at least one of said friction rollers being hollow with a perforated surface;
- (b) means for creating a suction within said hollow roller thereby drawing air through said perforations into said hollow roller and forming a yarn generating line:
- (c) means for supplying open fibers, oriented with their longitudinal axes substantially parallel to each other, in an air current, and means for withdrawing twisted yarn from one end of said hollow roller;
- (d) a channel for guiding said air current and said fibers onto the perforated surface of said hollow roller, having an opening with first and second end walls which extend around a portion of the periphery of said hollow roller, a top wall which extends about said roller and towards said spinning wedge, and a bottom wall which terminates adjacent the surface of the hollow roller at a point remote from said spinning wedge, the center line of said channel extending at an acute oblique angle to the generating line of said hollow friction roller, said angle also being acute with said generating line adjacent the end of said hollow friction roller opposite said one end of said roller from which the twisted yarn is withdrawn, whereby said perforated surface of said hollow roller acts as a bottom wall after the bottom wall terminates and said open fibers are deposited onto said perforated surface with their longitudinal axes at an acute oblique angle to said generating line.
Dependencies are inferred from the claim text.