Method and apparatus for multiple speed print rate control for d

Details Method and apparatus for multiple speed print rate control for d Method and apparatus for multiple speed print rate control for d

1975-10-20

1976-11-09

Rader, Ralph T.

Textiles: fiber preparation

178 30, 101 9305, 3401725, B41J 304

Patent

active

039905594

ABSTRACT:
A method and apparatus for controlling the print rate of a column-sequential dot matrix printer actuated by an input signal comprising a sequence of code words occurring at a given maximum input rate, a print head and a print head drive operating at a speed determined by the frequency of a print rate timing signal, and a multi-stage FIFO input storage register. A multiplicity of constant-frequency print rate timing signals are generated, ranging in frequency from substantially below to substantially above a normal print rate frequency Fn approximately matched to the input rate, and a variable print rate timing signal progressively increasing in frequency from well below Fn to well above Fn is also generated; these signals are applied to the printer in accordance with a predetermined schedule, determined by the number of code words in storage at the beginning of each spacing character cycle, and in accordance with a program affording relatively smooth acceleration and deceleration of the print head. In continuing operation, the number of code words in storage is accumulated to a given level and maintained approximately at that level until the input is interrupted.

REFERENCES:
patent: 3363238 (1968-01-01), Clark et al.
patent: 3444319 (1969-05-01), Artzt et al.
patent: 3668652 (1972-06-01), Zahn
patent: 3670861 (1972-06-01), Zenner et al.
patent: 3703949 (1972-11-01), Howard et al.
patent: 3719781 (1973-03-01), Fulton et al.
patent: 3938641 (1976-02-01), Fulton

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