Needle matrix printer

Details Needle matrix printer Needle matrix printer

1985-03-01

1986-07-15

Sewell, Paul T.

Typewriting machines

Typing by other than type-face or type-die

Character formation by impact

101 9305, 400121, B41J 312

Patent

active

046003223

ABSTRACT:
The needles (1) of this printer are fed by an electrical conductor (10) associated with the secondary of a step-down transformer (9) connected to a current pulse generator (8). The needle (1) having been placed in the magnetic field of a permanent magnet (7), the current (I) which passes through the needle gives rise to forces which tend to restore this needle to a straight line joining its points of support and guidance (2,3) while displacing the free end against a writing support.

REFERENCES:
patent: 3918567 (1975-11-01), Kittredge
patent: 4083299 (1978-04-01), Norton
patent: 4211493 (1980-07-01), Costello
patent: 4272200 (1981-06-01), Hehl

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