Printer having paper-out and column zero detection mechanism

Details Printer having paper-out and column zero detection mechanism Printer having paper-out and column zero detection mechanism

1988-09-30

1989-11-21

Sewell, Paul T.

Typewriting machines

Means auxiliary to typewriting function

Indicator means

400708, 400711, B41J 2942, B41J 2938

Patent

active

048818402

ABSTRACT:
A printer has a detection mechanism for detecting the absence of paper and the end position of the printhead upon start-up and reset. The detection mechanism includes a detection lever arm that is spring loaded and operationally positioned in a normal state. An optical sensor made up of an LED and a photo transistor that receives light from the LED, has the lower end of the detection lever arm operationally positioned in the normal state, between the LED and the photo transistor. The upper end of the detection lever arm is urged against the paper, by the spring. The platen supporting the paper has a groove formed therein which, in the absence of paper, receives the upper end of the detection lever arm, causing the lower end to move from its normal position between the LED and the photo transistor, the optical sensor then indicating a paper-out condition. The carriage for supporting and moving the printhead has an activation arm that moves against the detection lever arm when the carriage moves to the leftmost position, thereby moving the lower end of the lever arm away from the normal state, the optical sensor then indicating a column one position.

REFERENCES:
patent: 2293283 (1942-08-01), Dow
patent: 2320110 (1943-05-01), Walker
patent: 4540299 (1985-09-01), Yamada
patent: 4690577 (1987-09-01), Kikuchi
patent: 4800402 (1989-01-01), Lake

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