Margin control for printing apparatus

Details Margin control for printing apparatus Margin control for printing apparatus

1977-08-10

1979-05-01

Sewell, Paul T.

Typewriting machines

Carriage or carriage-moving or movement-regulating mechanism

Margin-regulator mechanism

400328, B41J 2530

Patent

active

041520831

ABSTRACT:
A printing apparatus having a moving carriage with a snap action switch mounted thereon to initialize the left and right margins of the printing apparatus. The carriage is moved to the left until the snap action switch strikes a stop on the frame of the machine. The carriage is then moved a predetermined distance to the right, and a left margin counter is set to zero while a right margin counter is set to a count representative of the width of printing between margins. The counters are incremented and decremented by movement of the carriage with the zero point of each counter representing presence of the carriage at that associated margin. Manual devices are provided for setting a narrower printing field with wider margins at either side by resetting the margin counters. Also, a margin release allows movement of the carriage outside of the narrowed printing field but never outside of a maximum printing field.

REFERENCES:
patent: 3463081 (1969-08-01), Levine
patent: 3554347 (1971-01-01), Perkins
patent: 3631957 (1972-01-01), Terry
patent: 3647041 (1972-03-01), Davis et al.
patent: 3757921 (1973-09-01), Bishop
patent: 3786429 (1974-01-01), Goldman et al.
patent: 3812945 (1974-05-01), Koplow et al.
patent: 3895704 (1975-07-01), Norris
patent: 3915278 (1975-10-01), Spence et al.
patent: 3923137 (1975-12-01), Kashio
patent: 3982622 (1976-09-01), Bellino et al.
patent: 4058195 (1977-11-01), Fravel et al.

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