Matrix printer

Details Matrix printer Matrix printer

1978-06-01

1980-10-28

Sewell, Paul T.

Typewriting machines

Typing by other than type-face or type-die

Character formation by impact

101 9304, 400124, B41J 312

Patent

active

042304113

ABSTRACT:
A matrix printer in which a plurality of printing punches in the form of sheet strips are arranged parallel to each other and are driveable in different combinations, according to the characteristics to be printed, by means of drive systems arranged in series and being associated each with a printing punch. Each drive system contains an armature, mechanically coupled to a printing punch, a magnetic circuit providing for an air gap, and a control coil. Also associated with each printing punch is a reset spring, for pulling the armature away from the air gap range into the inoperative position. The reset spring is loop-shaped and integrally formed with the associated printing punch. The magnetic circuit is provided with an air gap which is smaller than the stroke of the printing punch, so that even after closure of the air gap, the armature flies on substantially freely due to its inertia, until the printing punch strikes.

REFERENCES:
patent: 3820643 (1974-06-01), Priebs et al.
patent: 3934695 (1976-01-01), Kovalick
patent: 3963108 (1976-06-01), Steinhausser
patent: 4027761 (1977-06-01), Quaif
patent: 4044878 (1977-08-01), Kunath
patent: 4101017 (1978-07-01), Englund et al.

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