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    2.
    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.

    8.
    发明专利
    未知

    公开(公告)号：DE2331803A1

    公开(公告)日：1974-01-17

    申请号：DE2331803

    申请日：1973-06-22

    Applicant: IBM

    Inventor： HILL JAMES DAVID ,  NAYLOR HUGH EDWARD ,  WEST DONALD LEE

    IPC: B41J2/115 ,  B41J2/12 ,  B41J2/185 ,  G06K15/10 ,  H04N1/23 ,  B41J3/14

    Abstract: 1405197 Ink drop printers INTERNATIONAL BUSINESS MACHINES CORP 14 May 1973 [27 June 1972] 22760/73 Heading G4H An ink-drop printer 1-30 comprises means 37-57 for detecting failure in synchronisation between drop charging and drop formation. Test signals 41-43, 81 or 65 (ramp or pulse signals, Fig. 3, not shown) are applied to the charge electrode 18 so as to cause otherwise uncharged drops to be deflected into a gutter 35 or 36; the synchronization may be effected line-by-line (e.g. in the home position for each line), between characters or within the matrix boundaries of individual characters. Each gutter contains a sensor which translates charge into current level; the use of gutter 35 produces current levels smaller than those normally encountered during printing, whereas the levels obtainable from gutter 36 are higher since a greater potential is required to deflect the drops thereto (this can also detect lack of potential 25 on deflecting plate 22). The resulting signal A or B is changed to a voltage level and fed with a reference 55 to a comparator 57, the resulting difference signal being used to adjust the timing of drop separation in a piezo-electric crystal driver 15 relative to the signals applied to charge electrode 18. Another embodiment similar to that of Fig. 1 is described with reference to Fig 2 (not shown). Co-pending Application No. 41107/73 describes a similar system for a plurality of ink streams.

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