Shorthand machine having electric platen advancement

Details Shorthand machine having electric platen advancement Shorthand machine having electric platen advancement

1982-09-29

1983-12-20

Pieprz, William

Typewriting machines

Stenographic typewriter

Electrically powered

400187, B41J 326, B41J 2334, B41J 2308

Patent

active

044214278

ABSTRACT:
A shorthand machine including an electric drive system to advance the platen. In accordance with the invention, the platen can be advanced in a fully mechanical, conventional mode, fully electric mode, or by a combination of electric and mechanical drives. In the electric or electric/mechanical modes, after the shorthand machine operator makes a key stroke and releases the keys, an electric circuit pulses an electric motor connected to the platen to drive the platen for a predetermined duration of time. Subsequent to the driving pulse, power to the motor is reversed to quickly brake the motor and bring it to a rapid stop. The duration of time that the motor is activated may be varied, varying the amount of advancement of the platen, and thus varying the distance between recorded key strokes for each word or part of word generated by the operator of the shorthand machine.

REFERENCES:
patent: 1614473 (1927-01-01), Hokanson
patent: 1755281 (1930-04-01), Reppert
patent: 2593371 (1952-04-01), Watson
patent: 3038578 (1962-06-01), Ryan et al.
patent: 3062350 (1962-11-01), Demmel
patent: 4247208 (1981-01-01), Fulkerson et al.

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