Method and apparatus to monitor thread spinning operation of ope

Textiles: spinning – twisting – and twining – Apparatus and processes – Web material

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57 81, 57156, 73160, 324 61R, 340259, D01H 1322

Patent

active

040609650

ABSTRACT:
To prevent periodically recurring thickened portions of thread from open end spinning machines, a thread thickness sensing signal is conducted to a mono stable blocking multivibrator having an unstable blocked time just under, for example, ninety percent, of the time of pull off of thread during one revolution of the turbine, so that the distance of thread passing through the sensor during the unstable time is just slightly less than the circumference of the spinning turbine of the open end spinning machine. If other thickened portions result from a specific circumferential point of the turbine, resulting in periodic defects, the mono stable multivibrator will be triggered again and again; the trigger signals is summed, for example, by an integrator and if the sum of the pulses reach a certain value, a defect signal is generated, for example, stopping the machine. Before being applied to the mono stable multivibrator, the signals are preferably dynamically limited.

REFERENCES:
patent: 3069621 (1962-12-01), Butticaz et al.
patent: 3303698 (1967-02-01), Loepfe
patent: 4007457 (1977-02-01), Aeppli

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