Typewriting machines – Typing by other than type-face or type-die – Character formation by impact
Patent
1982-12-06
1984-06-12
Burr, Edgar S.
Typewriting machines
Typing by other than type-face or type-die
Character formation by impact
B41J 312
Patent
active
044538405
ABSTRACT:
A matrix print head operates 24 or more print wires to produce high quality characters. The head includes multiple levels, each of which contains common parts. Each level has a cup-shaped magnet frame, the bottom of which mounts poles. Around each pole is a bobbin-wound coil located via a tab on the bobbin which is held in a slot in the side wall of the magnet frame. An armature with a wide base and a narrow finger is associated with each pole. Each base pivots on a bevel edge formed in the side wall of the frame causing the finger to move a print wire. Posts on the bobbin extend through the holes in each armature to locate it on its pivot edge. The side wall of the frame and the armatures are configured so that only those portions capable of effectively contributing to moving the armatures are given substantial mass and size. Return force is applied to the armatures by a tensioned elastomeric band acting between the armature bases and a beveled surface spaced from the armatures. Each armature has its non-print position set by abutting an angled elastomeric member. The beveled surface for the band and a mounting surface for the elastomeric member may be provided by the same element, such as the facing portion of an adjacent level or a back plate.
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patent: 4407591 (1983-10-01), Adamoli et al.
Burr Edgar S.
Hirabayashi M. J.
Kaufmann John D.
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