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    3.
    发明专利
    未知

    公开(公告)号：DE2343420A1

    公开(公告)日：1974-04-25

    申请号：DE2343420

    申请日：1973-08-29

    Applicant: IBM

    Inventor： HILL JAMES DAVID ,  NAYLOR III HUGH EDWARD ,  WEST DONALD LEE ,  WILLIAMS THOMAS HAMPTON

    IPC: B41J2/075 ,  B05B5/025 ,  B41J2/08 ,  G06K15/10 ,  B41J3/04

    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.

    6.
    发明专利
    未知

    公开(公告)号：DE2361297A1

    公开(公告)日：1974-06-12

    申请号：DE2361297

    申请日：1973-12-08

    Applicant: IBM

    Inventor： SENDELWECK MICHAEL LYNN ,  WEST DONALD LEE ,  WILLIAMS THOMAS HAMPTON ,  PERKINS NORWOOD KENNETH ,  YOSMALI KRIKOR ,  FOWLER RAYMOND LAMAR ,  HILL JAMES DAVID ,  MCCORNACK RICHARD WILLLIAM

    IPC: B41J19/20 ,  B41J21/18 ,  B41J29/18 ,  B41J3/04

    Abstract: An ink jet printing apparatus is described having facilities for printing information in character locations, (boxes) each character location comprising a plurality of vertical columns of drop locations, and a number of characters comprising a line of information. Structures and circuits are included for insuring correct location of information within the character boxes and also providing for one mode in which characters are printed continuously line-by-line and another mode in which characters are printed incrementally character-by-character. During incremental printing, as well as the first character in a line or group of characters, provision is made for re-bounding the printhead back into the box of the character just printed, that is, prior to the next character box to be printed to insure that when the printhead starts up again for the next character that all drop components for that character, including any located in the immediate vicinity of the character boundary, are properly placed during printing.

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