Typewriting machines – Typing by other than type-face or type-die – Character formation by impact
Patent
1985-09-17
1987-02-17
Sewell, Paul T.
Typewriting machines
Typing by other than type-face or type-die
Character formation by impact
101 9304, B41J 308
Patent
active
046435964
ABSTRACT:
An impact dot printer has a print head which reciprocates back and forth in front of a rotationally driven platen to print dot matrix characters on a recording medium. The print head includes a single print hammer actuated by an electromagnetic driver. A succession of print timing signals are produced in synchronism with the rotational speed of the platen, and a home signal is generated each time the print head leaves its home position during the printing of each line. A control circuit initiates the printing of each line in response to the first print timing signal produced after generation of the home signal and controls the application of driving pulses to the electromagnetic driver so as to synchronize the actuation of the print hammer with the platen rotation.
REFERENCES:
patent: 3324240 (1967-06-01), Kleinschmidt et al.
patent: 3804008 (1974-04-01), Hoyer
patent: 3834304 (1974-09-01), Potter
patent: 3926293 (1975-12-01), Ljungberg
patent: 4024941 (1977-05-01), Sekikawa
patent: 4077336 (1978-03-01), Talvard et al.
patent: 4202638 (1980-05-01), Stenudd
Chida Yoshinori
Shimada Tatsuo
Tada Satoru
Adams Bruce L.
Burns Robert E.
Lobato Emmanuel J.
Seikosha Co. Ltd.
Sewell Paul T.
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