Three position platen control mechanism

Details Three position platen control mechanism Three position platen control mechanism

1976-08-20

1978-07-04

Pieprz, William

Typewriting machines

Platen or platen-moving mechanism

For movement of platen other than for line-spacing

269 63, 400124, 400 58, B41J 1120, B41J 1110

Patent

active

040983897

ABSTRACT:
A platen control mechanism includes a cam member which urges a cam following platen into three positions during a printing cycle. Two separate solenoids are connected to the cam member for moving the member to three distinct positions. In a first position both solenoids are de-energized thereby causing the platen to assume a wide gap position with respect to a printer head. This permits the insertion of a document. In a second condition, both solenoids are energized thereby forcing the platen into pressing relationship with a printer head. A third condition exists when one solenoid is energized and the other is de-energized thereby causing the platen to assume a narrow gap position with respect to the printer head which allows indexing motion of the document. At the end of a printing operation, both solenoids are de-energized so that the platen may return to a wide gap position permitting removal of the document. The limited movement of the platen during the mentioned document indexing minimizes the time required for a printing cycle.

REFERENCES:
patent: 3718295 (1973-02-01), Priebell et al.
patent: 3802546 (1974-04-01), Helms
patent: 3817365 (1974-06-01), Zimmerman
patent: 3837457 (1974-09-01), Anglin et al.
patent: 3848720 (1974-11-01), Carlsen
patent: 3912068 (1975-10-01), Kwan et al.
patent: 3952853 (1976-04-01), Feldman
patent: 3995730 (1976-12-01), Kwan et al.

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