Typewriting machines – Typing by other than type-face or type-die – Character formation by impact
Patent
1986-04-15
1988-07-19
Sewell, Paul T.
Typewriting machines
Typing by other than type-face or type-die
Character formation by impact
101 9305, 400689, B41J 312
Patent
active
047581034
ABSTRACT:
A method and apparatus for quieting the operation of a dot matrix printer by logically dividing the data to be printed among timed spaced printing passes is disclosed. A matrix of data to be printed is stored in a memory. A slice of data is selected from the stored data and the number of dots to be printed simultaneously is reduced by logically allocating the data in each slice among complementary submatrices. Each submatrix of data is printed substantially aligned with each other submatrix in two passes of the print head across the print medium to represent the entire selected slice of data. Noise reduction is achieved by reducing the number of data dots simultaneously printed at each print location.
REFERENCES:
IBM Tech. Disc. Bulletin, B. R. Cavill et al, vol. 24, No. 11A, Apr. 1982, pp. 5430-5432.
Angst Tim V.
Bunke Mark E.
Do Phuc K.
Krull Nicholas J.
Troupes Demetrios
International Business Machines - Corporation
Sewell Paul T.
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