G - Physics – 06 – K
Patent
G - Physics
06
K
101/96.09
G06K 15/10 (2006.01)
Patent
CA 1205677
MULTIPLE SPEED PRINTER ABSTRACT A dot matrix printer has a dot generator which projects dots through a dot selector and dot deflector towards a recording medium. Dots used for printing are selectively charged by the dot selector and deflected vertically by the dot deflector for printing on the recording medium. The dot generator moves horizontally at a speed S across the recording medium. Dots not used for printing are not charged, not deflected, and are collected in a gutter. A data input designates to the dot selector the character to be printed. A speed selector is operable to select standard speed printing S1, or high-speed printing S2. Speed S2 is equal to some factor Z multiplied by standard speed S1. If the standard speed printing is selected, the dot selector accesses the standard speed character matrix memory and receives dot position information corresponding to the designated character. The dot position information comprises X adjacent and parallel vertical scans, each scan comprising a column of Y potential dot, or matrix, positions. The dot selector codes each sequential dot with the position information for the next sequential matrix position of the scan. If high-speed printing S2 has been selected, the dot selector accesses the high-speed character matrix memory and receives dot position information corresponding to the designated character. The dot position information comprises X adjacent and parallel vertical scans, each scan having Y/Z potential dot, or matrix, positions. Since the matrix positions in the column of the scan have been reduced from Y to Y/Z, the standard scan time T is reduced to T/Z and the scan time is reduced in proportion to the increase in print speed. - 2 -
422588
Centronics Data Computer Corporation
Riches Mckenzie & Herbert Llp
LandOfFree
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