Method and apparatus for controlled feeding of sheets to printin

Details Method and apparatus for controlled feeding of sheets to printin Method and apparatus for controlled feeding of sheets to printin

1975-03-13

1976-06-29

Blunk, Evon C.

Sheet feeding or delivering

Feeding

With means to interrupt feeding

271103, B65H 714

Patent

active

039661970

ABSTRACT:
A printing machine receives single sheets which are removed from a stack by the suction cups of a feeding mechanism which is combined with a monitoring unit serving to detect the absence of sheets at the undersides of suction cups or the lifting of two or more sheets. The monitoring unit employs a transducer having two feelers which determine the thickness of lifted sheet material and an indicating device which is actuated by the feelers and produces signals serving to indicate the absence of sheets, the lifting of two or more sheets and/or to control the operation of the printing machine. The suction cups can form part of the transducer when the latter is designed to detect only the absence of sheets or they form part of a second transducer which is provided in addition to the first mentioned transducer.

REFERENCES:
patent: 1715360 (1929-06-01), Harrold
patent: 2837333 (1958-06-01), Sindzinski et al.

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