公开(公告)号：CA1033802A

公开(公告)日：1978-06-27

申请号：CA211478

申请日：1974-10-16

Applicant: IBM

Inventor： CARMICHAEL JOHN M ,  HILL JAMES D ,  WEST DONALD L

IPC: B41J2/13 ,  B41J19/18 ,  B41J19/20 ,  B41J21/18 ,  B41J29/42 ,  G06F3/12 ,  G06K15/08 ,  G06K15/10 ,  H04N1/23

公开(公告)号：CA978583A

公开(公告)日：1975-11-25

申请号：CA178367

申请日：1973-08-08

Applicant: IBM

Inventor： HILL JAMES D ,  NAYLOR HUGH E III ,  WEST DONALD L ,  WILLIAMS THOMAS H

IPC: B41J2/075 ,  B05B5/025 ,  B41J2/08 ,  G06K15/10

Abstract: 1385137 Printers INTERNATIONAL BUSINESS MACHINES CORP 4 Sept 1973 [13 Oct 1972] 41513/73 Heading G4H In an ink drop printer, one or more of a predefined sequence of ink-drop-deflection signals can be skipped through to speed up printing. After a shift register has been loaded via another shift register with a bit sequence for a given column of a character dot matrix, from a character generator, the bit sequence is shifted out, each "1" bit gating a slow clock train to a counter and permitting a D/A converter fed by the counter to control charging of a respective ink drop which is then deflected by a constant field by an amount dependent on the charge and therefore count. Each "0" bit zeroes the D/A converter output (so that the ink drop is caught in a gutter rather than deflected on to the paper) and gates a fast clock train to the counter so that the count position not required for printing is skipped through fast. To reduce ink spatter &c.' two or more sweeps down each column are made, with adjacent drops being deposited in different sweeps. A staircase generator may replace the counter and D/A converter.