Electromagnetic line spacing device

Details Electromagnetic line spacing device Electromagnetic line spacing device

1978-06-28

1981-03-10

Wright, Jr., Ernest T.

Typewriting machines

For line-spacing by incremental rotation of platen

By electric-power drive

400611, 400659, B41J 1976

Patent

active

042550637

ABSTRACT:
A platen for a typewriter, is rotated intermittently by pulsing a winding to establish flux between poles of a stator and a rotor, which rotates through a fixed angle and then back to a datum position under the action of a spring. The magnetic flux also engages an electro magnetic clutch formed by the rotor and a part rotationally fast with the platen so that the platen is rotated only during the forward rotation of the rotor. The stator, rotor and said part are all coaxial with the platen and may be housed inside the platen.

REFERENCES:
patent: 779063 (1905-01-01), Benicke et al.
patent: 2203024 (1940-06-01), Lewis et al.
patent: 2234262 (1941-03-01), Lake
patent: 3014570 (1961-12-01), Cunningham
patent: 3048253 (1962-08-01), Oldenburg et al.
patent: 3315860 (1967-04-01), Adams et al.
patent: 3880016 (1975-04-01), Jamieson et al.
patent: 4088214 (1978-05-01), Shindo et al.

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