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公开(公告)号：US3628644A
公开(公告)日：1971-12-21
申请号：US3628644D
申请日：1969-12-22
Applicant: IBM
Inventor： CRALLE WALTER O JR , SIMPSON HENRY W , KOCKLER BARRY C
CPC classification number: B41J7/02
Abstract: The impact time of an electrically driven-type element is directly sensed and employed to control a direct printer function, such as the impact drive itself or an ancillary printer function such as letter feed or data input control. Actual sensing of the impact point is preferably accomplished by observing the impact-force-induced polarity change of back EMF of a DC motor employed to drive the type element. Back EMF is also employed to control impact drive velocity.
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