Control device for a matrix printer

Details Control device for a matrix printer Control device for a matrix printer

1977-11-25

1979-10-02

Sewell, Paul T.

Typewriting machines

Typing by other than type-face or type-die

Character formation by impact

101 9305, 364900, B41J 312

Patent

active

041696840

ABSTRACT:
A control device for a matrix printer. At the beginning of a line, a chaining unit is filled with a starting column address, a starting row address and a starting character address, the latter being to address a line buffer containing data of a line of characters. The line buffer supplies a character signal which addresses a character generator having column addresses and row addresses as further sub-addresses. The chaining unit contains data about the relevant row advances and column advances. Between the displacement of the movable member over one column distance, the chaining circuit successively calculates dot data for all recording elements, said data being serially loaded into a dot register. When the next column position is reached, the dot data are used to activate the recording elements. The character generator has at least two sets of characters of different dimensions, and the chaining unit has for each character set at least one mode position for translating the column advances and row advances into addresses for the character generator. The advances may be embodied in a counter or a read-only memory.

REFERENCES:
patent: 3789969 (1974-02-01), Howard et al.
patent: 3802544 (1974-04-01), Howard et al.
patent: 3833891 (1974-09-01), Howard et al.
patent: 4024506 (1977-05-01), Spaargaren

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