Power-operated typewriter

Details Power-operated typewriter Power-operated typewriter

1981-02-26

1983-10-04

Pieprz, William

Typewriting machines

Safety switch or condition-responsive-cutoff switch for...

400668, B41J 2308, B41J 2938, B41J 2956

Patent

active

044075928

ABSTRACT:
The typewriter has a powered motor, an electric power switch, a drive shaft driven by the motor, a driven mechanism including printing and carriage return mechanisms connected to the drive shaft by way of respective clutches, and locking device for locking the clutches in their disconnect state. The locking device consist essentially of a cam portion on a manually operable member designed for turning on and off the switch, and a locking element actuated by the cam portion. When the manually operable member is actuated for turning off the switch, the clutches are locked in their disconnect state by the cam portion through the locking member. During cessation of the motor operation, these clutches may not be connected by faulty manipulation of the key or keys associated with the driven mechanism for reliably preventing incidental printing or carriage return movements upon restarting of the motor from occuring.

REFERENCES:
patent: 2252004 (1941-08-01), Helmond
patent: 2255029 (1941-09-01), Tholstrup
patent: 2675902 (1954-04-01), Kupper
patent: 2810466 (1957-10-01), Lambert et al.
patent: 2880837 (1959-04-01), Lambert et al.
patent: 2903118 (1959-09-01), Link
patent: 2919002 (1959-12-01), Palmer
patent: 2945577 (1960-07-01), Frechette, Jr.
patent: 3025940 (1962-03-01), Wheeler
patent: 3349886 (1967-10-01), Madison et al.
Kindler et al. "On-off machine lockout system, dead key" IBM Technical Disclosure Bulletin, vol. 24, No. 3, pp.1365-1367, 8/81.

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