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    ELECTROSTATIC CLUTCH-OPERATED PRINTING MECHANISM
    5.
    发明专利
    ELECTROSTATIC CLUTCH-OPERATED PRINTING MECHANISM 未知

    公开(公告)号：DE3167635D1

    公开(公告)日：1985-01-17

    申请号：DE3167635

    申请日：1981-09-23

    Applicant: IBM

    Inventor： LANDON ALFRED JOSEPH ,  PENNEBAKER WILLIAM BOONE ,  WANG HAN CHUNG

    IPC: B41J9/40 ,  B41J9/44 ,  B41J23/04 ,  B41J23/16

    Abstract: An impact printing mechanism is disclosed having an electrostatic clutch assembly, including a rotatively mounted semiconductive coated drum and a conductive band wrapped around the circumference thereof. The printing mechanism includes a printing hammer and a print spring for actuating the printing hammer. When a print command is issued, a voltage is applied to the band to create a field between the band and the drum coating. An electrostatic force is therefore generated when the drum is rotating slowly or synchronous with the drum step motion. That motion will pull the band and compress the print spring. The potential energy stored in the spring is then ready to fire the hammer. A hammer firing command turns off the voltage pulse and discharges the field, releasing the electrostatic holding force instantaneously and firing the hammer by the compressed spring.

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