Device for controlling the rotary movement of a platen

Details Device for controlling the rotary movement of a platen Device for controlling the rotary movement of a platen

1984-09-11

1986-12-23

Burr, Edgar S.

Typewriting machines

For line-spacing by incremental rotation of platen

By electric-power drive

400551, 400569, 200 11J, 200 11K, 200 11TW, 200153K, B41J 1992

Patent

active

046309497

ABSTRACT:
A device for controlling the rotary movement of a platen roller of a typewriter comprises a bidirectional electric motor coupled to the platen by a worm gear and gear wheel and a pair of knobs which are disposed at the sides of the platen and which are rotatable with respect thereto. The knobs are fixed to a bar which extends rotatably through the platen roller and carries the gear wheel. Selective bidirectional rotation of the knobs causes corresponding rotary movement of a disc in a transducer. The disc has a toothed sector in mesh with the gear wheel and is the moving part of a rotary switch which generates electrical signals which determine both the power supply to the electric motor and the direction of rotation thereof. Small degrees of rotary movement of the knobs against a first spring force establish continuous rotary movement of the platen roller at low speed. A further slight rotary movement of the knobs against a stronger spring force establishes rotary movement of the platen at high speed.

REFERENCES:
patent: 1539521 (1925-05-01), Smith
patent: 2008053 (1935-07-01), Whiteside
patent: 3754106 (1973-08-01), MacDonald
patent: 4135065 (1979-01-01), Nicot
patent: 4405248 (1983-09-01), Wunderlich et al.
Garrison et al; "Automated Platen Vernier Switch"; IBM Technical Disclosure Bulletin; vol. 22, No. 5, pp. 1760-1763; Oct. 1979.
Holcomb et al; "Simulated Platen Knobs for Typewriters"; IBM Technical Disclosure Bulletin; vol. 24, No. 12, pp. 6532-6533; May 1982.

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