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    HOME PULSE COMPENSATION FOR MULTIPLE SPEED LINE PRINTER
    3.
    发明专利
    HOME PULSE COMPENSATION FOR MULTIPLE SPEED LINE PRINTER 未知

    公开(公告)号：CA1179889A

    公开(公告)日：1984-12-27

    申请号：CA425350

    申请日：1983-04-06

    Applicant: IBM

    Inventor： CARRINGTON JAMES E ,  HRYCK MICHAEL D ,  SKINNER DEAN W ,  WESTCOTT GERALD R

    IPC: B41J1/20 ,  B41J7/36 ,  G06K15/08 ,  B41F1/18

    Abstract: HOME PULSE COMPENSATION FOR MULTIPLE SPEED LINE PRINTER The control system for a line printer includes compensation circuit means for electronically changing the timing of the reference or home pulse to compensate for changes in the speed of the type characters on a continuous type carrier. The compensation circuit includes a storage register, a counter and a comparison circuit for comparing the content of the storage register and the counter. The counter when activated by a reference pulse generated from a reference mark on the moving type carrier counts subscan pulses generated from timing marks moving with the type characters. The storage register, which is programmable, stores different numeric values dependent on the speed of the type carrier representing different numbers of subscan pulses to be counted by the counter means. The comparator circuit compares the numeric value in the register with the count registered in the counting means. When an equality is detected, the comparator circuit generates a modified reference or sync pulse which is applied to sync control circuitry which checks the character signal produced by the type position circuitry of the printer controls. EN981003

    CONTROL FOR ENABLING FLIGHT TIMING OF HAMMERS DURING PRINTING
    4.
    发明专利
    CONTROL FOR ENABLING FLIGHT TIMING OF HAMMERS DURING PRINTING 未知

    公开(公告)号：CA1301539C

    公开(公告)日：1992-05-26

    申请号：CA574530

    申请日：1988-08-11

    Applicant: IBM

    Inventor： CARRINGTON JAMES E ,  WESTCOTT GERALD R

    IPC: B41J9/46 ,  G06K15/08 ,  B41J1/20

    Abstract: A printer control apparatus provides a control circuit arrangement which enables flight timing to be performed during printing. Basically, the invention achieves this by providing flight time control means activated by a print hammer operation signal. Preferably the control temporarily inhibits the continuation of print hammer operation. Preferably the control inhibits print hammer operation subsequent to a selected print hammer by inhibiting the comparisons of print line and tape element data contained in storage devices of the print control. Inhibiting may be for a fixed interval based on an average of the flight times of all the hammers. Alternatively the inhibiting interval may be varied according to the individual flight times of the hammers.

    PRINT HAMMER LIMIT CONTROL
    6.
    发明专利
    PRINT HAMMER LIMIT CONTROL 未知

    公开(公告)号：CA1199218A

    公开(公告)日：1986-01-14

    申请号：CA419769

    申请日：1983-01-19

    Applicant: IBM

    Inventor： CARRINGTON JAMES E ,  WESTCOTT GERALD R

    IPC: B41J7/36 ,  B41J9/46 ,  B41J9/52 ,  B41J9/54 ,  G06K15/08 ,  B41J1/20

    Abstract: PRINT HAMMER LIMIT CONTROL A hammer limit control for an on-the-fly line printer comprises a counter which counts compare signals from a compare circuit which detects coincidences of print data and type position data in synchronism with the motion of an endless type carrier. The counter maintains a running count of the number of compare signals for a control interval having a duration which is a function of the printing interval of a print line cycle. A hammer on storage device stores a plurality of compare counts registered by the counter at the end of each of a plurality of control intervals. An adder adds the running count registered in the counter to the total count stored in the storage means and stores the total sum in a hammer on register. When the total sum in the hammer on register equals a maximum number, a limit comparator generates a control signal which inhibits further comparisons by the compare circuit. The content of the hammer on storage device is updated each control interval by transferring the compare count registered in the compare counter to the storage device and by deleting the oldest count in the hammer on storage after a predetermined number of control intervals. The maximum number is stored in a register which is programmable.

    7.
    发明专利
    未知

    公开(公告)号：DE3578880D1

    公开(公告)日：1990-08-30

    申请号：DE3578880

    申请日：1985-11-05

    Applicant: IBM

    Inventor： CARRINGTON JAMES E ,  WESTCOTT GERALD R

    IPC: B41J7/44 ,  B41J7/36 ,  B41J9/00 ,  B41J9/46

    Abstract: @ A hammer timing control system for the print hammers of a line printer uses a plurality of read/write RAMs (24-30) in place of individual ,fire control circuits for controlling the firing periods of the hammers. A delay value RAM (90) stores individual delay values to be interposed before each hammer is fired, and a terminate fire RAM or register (84) stores a delay to be interposed before the firing of a hammer is terminated. The hammers are turned on and turned off by signals incrementally clocked out from two pairs of RAMs which store each hammer address at memory locations corresponding to the hammer's assigned delay values.

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