Typewriting machines – Typing by other than type-face or type-die – Character formation by impact
Patent
1982-01-06
1984-01-03
Sewell, Paul T.
Typewriting machines
Typing by other than type-face or type-die
Character formation by impact
101 9305, B41J 312
Patent
active
044239696
ABSTRACT:
An impact dot matrix print head has a body with a coil frame assembly and a nose piece on the rear of which the coil frame assembly is mounted. The nose piece has guides for print wires which are maintained in sliding relationship by a linear slot guide at the front end of the nose piece. Armatures are freely disposed at one end on the frame and at the other end on the rear ends of the print wires. An end cap which bears on the frame assembly has a plurality of posts which extend through holes in each of the armatures and holes in spider springs which bear against the end cap and against the armatures where they bear against and pivot on the frame whereby to provide for ease of assembly and low friction guidance of the armatures and the spider springs which retain them. These springs may also be located with respect to the pivot so that they oppose the force of return springs on the print wires and partially balance such force to improve magnetic actuation of the armatures to help increase the printing speed of the head. Another end cap at the front of the frame assembly and the rear end cap are joined together by press fitting into posts to clamp the frame assembly into assembled relationship. A printed circuit board to which the coils are connected may be attached to the outside of the front end cap facing the front end of the nose piece.
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Lukacher Martin
Precision Handling Devices Inc.
Sewell Paul T.
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