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    Ink jet speed control for printer - has two droplet detectors positioned along flight path and connected to oscillator generator control
    1.
    发明专利
    Ink jet speed control for printer - has two droplet detectors positioned along flight path and connected to oscillator generator control 未知

    公开(公告)号：DE2750303A1

    公开(公告)日：1978-05-18

    申请号：DE2750303

    申请日：1977-11-10

    Applicant: IBM

    Inventor： ARNOLD ROBERT WALKER ,  TOMASKY THOMAS

    IPC: B41J2/125 ,  B41J3/04

    Abstract: Ink jet printer has a control for regulating the speed of the ink jet within a predetermined speed range. Two ink droplet detectors (24, 25) are positioned at a predetermined distance from one another and the droplet selection unit (17) and are connected to a servo-control (23) to which an impulse generator (16, 16a) is also coupled. This generator is connected to an oscillator (15). In the direction of flight the distance of the first detector (24) from the droplet formation point and the distance of the second detector (25) from the selection unit (17) amount in each case to a certain number of droplet wave lengths. When the droplets are travelling at the desired speed, the spacing between the two detectors amounts to.

    2.
    发明专利
    未知

    公开(公告)号：BR8203144A

    公开(公告)日：1983-05-17

    申请号：BR8203144

    申请日：1982-05-28

    Applicant: IBM

    Inventor： ARNOLD ROBERT WALKER

    IPC: B41J9/44 ,  B41J9/50 ,  G05F1/10 ,  H01F7/18 ,  H01H47/32

    Abstract: A constant energy drive circuit for an inductive load, e.g. an electromagnetic print hammer has a chopping circuit including a comparator (19) which cycles a switch means (10. 14) connecting the energizing coil (11) of the print hammer to an unregulated power supply. Changes in the drive voltage (V1) of the unregulated source are compensated for by altering the switching rate of the switch means by adjusting the amplitude of a reference signal (V R ) applied to the comparator. The reference signal adjustment is inverse to changes in the drive voltage.

    CHOPPING DRIVE CIRCUIT FOR AN ELECTROMAGNETIC PRINT HAMMER OR THE LIKE
    3.
    发明专利
    CHOPPING DRIVE CIRCUIT FOR AN ELECTROMAGNETIC PRINT HAMMER OR THE LIKE 未知

    公开(公告)号：DE3272430D1

    公开(公告)日：1986-09-11

    申请号：DE3272430

    申请日：1982-04-15

    Applicant: IBM

    Inventor： ARNOLD ROBERT WALKER

    IPC: B41J9/44 ,  B41J9/50 ,  G05F1/10 ,  H01F7/18 ,  H01H47/32 ,  H03K17/64 ,  B41J9/38

    Abstract: A constant energy drive circuit for an inductive load, e.g. an electromagnetic print hammer has a chopping circuit including a comparator (19) which cycles a switch means (10. 14) connecting the energizing coil (11) of the print hammer to an unregulated power supply. Changes in the drive voltage (V1) of the unregulated source are compensated for by altering the switching rate of the switch means by adjusting the amplitude of a reference signal (V R ) applied to the comparator. The reference signal adjustment is inverse to changes in the drive voltage.

    4.
    发明专利
    未知

    公开(公告)号：DE2945697A1

    公开(公告)日：1980-05-29

    申请号：DE2945697

    申请日：1979-11-13

    Applicant: IBM

    Inventor： ARNOLD ROBERT WALKER ,  GALETTO LOUIS VALENTINE

    IPC: H02P7/06 ,  H02P7/29 ,  H02P5/06

    Abstract: A pulse width modulated DC motor control system is designed to operate a DC motor at constant velocity. Feedback pulses generated at a rate proportional to the rotational velocity of the motor are converted to control pulses having a fixed on-time period which is independent of changes in the velocity of the motor. The control pulses are used to modulate a constant current source whose output is integrated to generate a sawtooth voltage signal whose average DC value is used as the basis of or pulse width modulating a DC voltage applied to the motor drive circuits of a DC motor.

    6.
    发明专利
    未知

    公开(公告)号：BR8203226A

    公开(公告)日：1983-05-17

    申请号：BR8203226

    申请日：1982-06-02

    Applicant: IBM

    Inventor： ARNOLD ROBERT WALKER ,  AKINNER DEAN WILLIAM

    IPC: B41J9/38 ,  B41J9/44 ,  G05F1/56 ,  H01F7/18 ,  H01H47/32

    Abstract: A constant energy drive circuit comprises two interconnected chopping circuits (19, 21-24 and 26-30) successively operable to control the current in a coil (10) of an electromagnetic actuator. One chopping circuit (19, 21-24) operates during the rise time portion of the operating interval, the other (26-30) operates beginning with the occurrence of a predetermined peak current and for remainder of the operating interval of fixed duration.

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