Process and apparatus for piecing a yarn on spinning assemblies

Details Process and apparatus for piecing a yarn on spinning assemblies Process and apparatus for piecing a yarn on spinning assemblies

1978-02-21

1979-10-30

Gorenstein, Charles

Textiles: spinning, twisting, and twining

Apparatus and processes

Piecing up

57 78, D01H 1500

Patent

active

041723570

ABSTRACT:
A process and apparatus for piecing a yarn on spinning assemblies of an open end spinning machine is provided. A prepared yarn end is pieced to a sliver ring produced in a spinning rotor during running up of the spinning rotor from a predetermined slower speed toward its operational normal spinning speed. In order to accommodate application of the yarn end to the sliver ring, the formation of the sliver ring, and the drawing off of new yarn pieced together at the sliver ring, the invention provides for a control of the acceleration behavior of the spinning rotor so as to lengthen the time segment in which the piecing steps can be performed. In preferred embodiments, non-contact electromagnet or electrical eddy current braking means are provided for countering the driving torque of a common drive means for the rotors of several spinning assemblies, whereby the acceleration curve is flattened with a lengthening of the time period for existent desirable piecing speeds. In other preferred embodiments, inter-exchangeable spinning rotors of different diameters are provided with similar mass moments of inertia so as to exhibit similar flattened acceleration curves, even for very small diameter spinning rotors. In other preferred embodiments, driving mechanisms and/or braking mechanisms for the spinning rotor shafts are provided for controlling the running up or acceleration behavior.

REFERENCES:
patent: 3704579 (1972-12-01), Tooka et al.
patent: 3760576 (1973-09-01), Le Chatelier et al.
patent: 3780513 (1973-12-01), Wanatabe et al.
patent: 3791128 (1974-02-01), Landwehrkamp et al.
patent: 4059946 (1977-11-01), Bottcher et al.
patent: 4080775 (1978-03-01), Stahlecker

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