Apparatus for preventing incorrect collating of signatures

Details Apparatus for preventing incorrect collating of signatures Apparatus for preventing incorrect collating of signatures

1977-08-19

1979-08-14

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250237R, H01J 314

Patent

active

041646517

ABSTRACT:
An incorrect collating preventing apparatus has a photoelectrical detector including at least one optical system which comprises a lens for converting light beams from a lamp into parallel light beams, and optical means for introducing the parallel light beams through a focusing lens to a surface of each signature and for introducing substantially all of the light beams reflected by the surface of each signature to a photoelectric element, the optical means being a reflector with a hole so as to allow the reflected light beams to pass through the hole, or a transparent plate with a reflector portion where the reflected light beams are focused and are directed to the photoelectric element.

REFERENCES:
patent: 3202043 (1965-08-01), Galey et al.
patent: 3337717 (1967-08-01), Cerf et al.
patent: 3338130 (1967-08-01), Gaffard
patent: 3456997 (1969-07-01), Stites et al.
patent: 3992623 (1976-11-01), Rhyins et al.

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