Free flight hammer for impact printer

Details Free flight hammer for impact printer Free flight hammer for impact printer

1982-01-18

1983-08-30

Coven, Edward M.

Printing

Selective or progressive

Bed and platen machines

101 9348, B41J 930

Patent

active

044010265

ABSTRACT:
The hammer of a serial impact printer comprises a solenoid including a stationary magnetic structure with an opening extending therethrough and a movable magnetic structure adapted to move through the opening. The movable magnetic structure is accelerated by the flux path from the stationary magnetic structure and through the movable magnetic structure as the gap between the movable and stationary magnetic structures closes such that the movable magnetic structure is in substantially unobstructed free flight before the impact area coupled to the movable magnetic structure strikes the character element. The character element in turn strikes a print receiving medium supported by a platen, typically through an ink-bearing ribbon.

REFERENCES:
patent: 3473466 (1969-10-01), Thayer
patent: 3543906 (1970-12-01), Hladky
patent: 3707122 (1972-12-01), Cargill
patent: 3901371 (1975-08-01), Scott
patent: 4004505 (1977-01-01), Magnenet
patent: 4018155 (1977-04-01), Corgill
patent: 4037532 (1977-07-01), Plaza et al.
patent: 4070903 (1978-01-01), Weaver
Mills et al, IBM Tech. Discl. Bulletin, vol. 15, No. 8, 1/73, p. 2356.

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