Detent apparatus for print wheel

Details Detent apparatus for print wheel Detent apparatus for print wheel

1983-02-24

1984-08-07

Burr, Edgar S.

Typewriting machines

Including type-set-assemblage mounted on carrier and...

Including type-faces movable relative to type-face-carrier

4001545, 400163, 318685, 318696, B41J 130

Patent

active

044640714

ABSTRACT:
A serial printer comprising a print wheel having numerous type bearing spokes, each of which extends radially and which is provided with a type element on the tip of the spoke, a stepping motor for rotating the print wheel, a print hammer for striking the desired spoke behind the type element during printing operation, a positioning means for guiding a selected type element to a printing point during the striking operation of the print hammer, and a control circuit for regulating the driving of the stepping motor and the print hammer. The control circuit causes the stepping motor to move the selected type element to a position whereat the type element is struck by the print hammer. The control circuit suspends the energize-hold operation of the stepping motor at the moment that the type element is struck by the print hammer. This invention accurately positions the type element for substantially aligned printing operation, and greatly reduces damage to the spokes due to material fatigue.

REFERENCES:
patent: 3707214 (1972-12-01), Ponzano
patent: 3840105 (1974-10-01), Kittredge
patent: 4035708 (1977-07-01), Schaff
patent: 4147968 (1979-04-01), Goble
patent: 4198169 (1980-04-01), Stuiber et al.
"Low Inertia Daisy Wheel Printer"; IBM Technical Disclosure Bulletin; N. Leon; vol. 22, No. 2; Jul. 1979; pp. 809-810.

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