Title: Automatic bottom margin signal system for typewriters

Abstract: A device for detecting the trailing end of a sheet inserted in a typewriter including a rod adjustably mounted on the carriage, extending below the platen and a transparent table for carrying the sheet. A reflective plate is positioned above the table, and the platen has a reflective coating. The rod supports a miniature light source and photo cell so that light returned from the reflective surfaces will generate a current in the photocell causing activation of an alarm. An alternative embodiment utilizes an electrically conductive rod arrangement including contact on the typewriter frame to create a closed circuit, the sheet passes through the contact point breaking the circuit.

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Inventors: Giuliani, Robert L. (Kaneohe, HI, US)

Application Number: 525593
Filing Date: 1974-11-20
Publication_date: 1976-09-21
Assignee:
Primary Class(es): 400/706 400/578, 400/662, 400/694, 400/711, 400/716
Other Classes:
US Patent Ref:

1208606	Dec, 1916	Mayer	197/189.
2689033	Sep, 1954	Grenier	197/189.

Other Refs: 1,812,168

Aug, 1970	DT

Primary Examiner: Oechsle, Anton O.
Assistant Examiner:
Attorney: Rusz; Joseph E., Miller; Henry S.