Length measuring apparatus

Details Length measuring apparatus Length measuring apparatus

1989-10-24

1991-04-16

Rosenberger, Richard A.

Optics: measuring and testing

By configuration comparison

With photosensitive film or plate

356150, 250560, G01B 1104

Patent

active

050077392

ABSTRACT:
An apparatus for measuring the length of a sheet moving at a constant speed in one direction comprises front and rear edge detectors for detecting front and rear edges of the sheet to output front and rear edge signals, respectively, and an angle detector for detecting the angle at which the sheet moving in that one direction is inclined relative to that one direction to output an angle signal representative of the angle of inclination. An arithmetic circuit operates to calculate an apparent length of the sheet in the direction based on the front and rear edge signals and to correct that apparent length of the sheet with the angle signal so as to determine the actual length of the sheet.

REFERENCES:
patent: 3621266 (1971-11-01), Akuta et al.
patent: 4088411 (1978-05-01), Ahlquist et al.
patent: 4201378 (1980-05-01), Hamis
patent: 4623975 (1986-11-01), Kagami

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