Method of measuring the pitch angle of yarns provided with a twi

Details Method of measuring the pitch angle of yarns provided with a twi Method of measuring the pitch angle of yarns provided with a twi

1975-08-20

1976-10-12

Corbin, John K.

Optics: measuring and testing

Refraction testing

Prism engaging specimen

250237R, 250571, 356138, 356238, G01B 1126

Patent

active

039854515

ABSTRACT:
A method of measuring the pitch angle of yarns provided with a twist, characterized in that an image of the surface of the thread is cast onto a slitted shutter, the slitted shutter and the thread are rotatable relatively to each other about their connecting axis and that the intensity of the light passing through the slitted shutter is measured as a function of the relative angle of rotation between thread and slitted shutter.

REFERENCES:
patent: 2824488 (1958-02-01), Bridges et al.
patent: 2991685 (1961-07-01), Van Dongeren

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