Measuring apparatus

Details Measuring apparatus Measuring apparatus

1976-08-11

1977-08-09

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250227, 250233, G01N 2130

Patent

active

040413217

ABSTRACT:
Apparatus for measuring the length of an elongate product, such as a rolled steel bar or shape. The product is inserted between a light source and a light receiver, and thereby throws a shadow on the light receiver. The receiver comprises an outer, stationary cylinder which has a longitudinal slit, and an inner rotatable cylinder which has a helicoidal or triangular or similar slit. The outer and inner slits jointly define a window of changeable form or position. Through this window, incident light from the source, free of the product's shadow, falls on a light conducting rod or system, thereby controlling a photo-sensitive system which provides a measurement of the exact end of the shadow's position, and thereby of the length of the product.

REFERENCES:
patent: 1945968 (1934-02-01), De Amicis
patent: 3358150 (1967-12-01), Summer
patent: 3619626 (1971-11-01), Rudolf
patent: 3727067 (1973-04-01), Shepherd
patent: 3806730 (1974-04-01), Tirkkonen et al.

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