Typewriting machines – Typing by other than type-face or type-die – Character formation by impact
Patent
1976-12-22
1978-09-26
Wright, Jr., Ernest T.
Typewriting machines
Typing by other than type-face or type-die
Character formation by impact
101 9305, B41J 304
Patent
active
041165675
ABSTRACT:
A printer synchronization control for maintaining columnar alignment of dots printed by a dot matrix printer including a shuttle wherein the relative velocity between the paper and shuttle is non-uniform. Plural print elements are mounted on the shuttle for printing dots at preselected positions on the paper. A particular row and column arrangement of the dots defines a character. A counter measures the relative velocity between the paper and shuttle over a period of time inversely proportional to the relative velocity. A second counter determines the time at which an actuator must be triggered to cause a print element to strike the paper at a preselected columnar position to maintain columnar alignment of the dots in a character. Means are provided for causing the print element to strike the paper at the preselected columnar position as a function of the second counter. A third counter may be provided to enable two or more sets of the print elements to be actuated in time-staggered fashion to minimize peak current drain.
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patent: 3973662 (1976-08-01), Fulton
patent: 4027761 (1977-06-01), Quaif
patent: 4029192 (1977-06-01), Manthiram
Okidata Corporation
Wright, Jr. Ernest T.
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