Typewriting machines – Typing by other than type-face or type-die – Character formation by impact
Patent
1986-05-16
1989-04-04
Sewell, Paul T.
Typewriting machines
Typing by other than type-face or type-die
Character formation by impact
101 9305, 335274, B41J 312
Patent
active
048181331
ABSTRACT:
A wire matrix print head includes a plurality of axially movable print wires, each having an associated electromagnetic actuator comprising an actuating armature and an electromagnet. An E-shaped, laminated pole piece is utilized to obtain extremely high speed operation. The center arm of the E-shaped pole piece includes a portion of reduced width to provide space for the energizing coil, while the inner arm has full width to maximize the actuating force. The armature is pivoted about a point inward of the outer edge of the pole piece and is returned to its standby position by an O-ring prior to the print wire reaching the standby position. The print head includes a print wire guide assembly which imparts a constant radius curvature to each print wire.
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IBM Tech Disc. Bulletin, by D. W. Hanna, vol. 24, No. 3, Aug. 1981, pp. 1702-1704.
Busse James T.
Williams Richard A.
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