Method of and device for checking for the presence of a sheet of

Details Method of and device for checking for the presence of a sheet of Method of and device for checking for the presence of a sheet of

1983-11-04

1986-09-23

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

226181, G01N 904

Patent

active

046137505

ABSTRACT:
The presence and/or desired orientation of a sheet of material is sensed by normally passing the sheet under the first of two spaced rollers of identical diameter, the rollers being mounted on a common support for rotation independently of one another. The second roller will rotate only in the absence of or misalignment from under the first roller of the sheet material. Rotation of the second roller is detected and causes generation of a fault warning.

REFERENCES:
patent: 3886338 (1975-05-01), Lockun et al.
patent: 3889111 (1975-06-01), Moss
patent: 3917142 (1975-11-01), Guarderas
patent: 4145608 (1979-03-01), Shirasaki et al.

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