Open-end spinner piecing method and apparatus and multi-position

Details Open-end spinner piecing method and apparatus and multi-position Open-end spinner piecing method and apparatus and multi-position

1986-10-20

1988-07-19

Petrakes, John

Textiles: spinning, twisting, and twining

Apparatus and processes

Piecing up

57261, 57401, 57405, D01H 1502, D01H 1135

Patent

active

047576774

ABSTRACT:
An open-end spinning machine includes a low inertia sensing wheel frictionally engaging the package so that the rate of rotation of the frictional sensing wheel is sensed by a tachometer generator to provide a "winding rate" signal fed to a controller for controlling the speed of a stepper motor driving the fibre feed roller of the fibre opening unit during piecing, in response to the take-up of yarn at the package. Optionally, the sensing wheel is supported on a link such that the angular position of the link indicative of the diameter of the package is sensed by an angular position transducer and the signal of the transducer is also fed to the controller.
Yarn delivery rolls are separated, during piecing, to allow the rate of withdrawal of the yarn from the doffing tube of the open-end spinning unit in response solely to the accelerating package.
The draft is non-linear during piecing, in accordance with a predetermined programme.

REFERENCES:
patent: 4159616 (1979-07-01), Takeuchi et al.
patent: 4228642 (1980-10-01), Dakin et al.
patent: 4288975 (1981-09-01), Yoshida et al.
patent: 4472933 (1984-09-01), Raasch et al.
patent: 4524578 (1985-06-01), Raasch et al.
patent: 4538408 (1985-09-01), Baltsch et al.
patent: 4563871 (1986-01-01), Stahlecker et al.
patent: 4606184 (1986-08-01), Stahlecker et al.

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