公开(公告)号：US3592310A

公开(公告)日：1971-07-13

申请号：US3592310D

申请日：1966-09-19

Applicant: IBM

Inventor： CRALLE WALTER O JR ,  MORGAN JOSEPH S ,  TOBEN BERNARD E

IPC: B41J19/64 ,  B41J19/58 ,  B41J29/42

CPC classification number: B41J19/64

Abstract: Spacing data for right-hand margin justification is graphically computed by a pair of intercooperating scales, one of which has biaxial color coded indicia, the other of which includes a uniaxial scale. The uniaxial scale is readable in conjunction with the biaxial color coding directly in terms of a justification problem solution. Also, a self-powered motion takeoff device is provided for automatically positioning one of the two scales by following motion of a typewriter letter feeding device within a predetermined proximity of the right margin.

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

IPC: B41J7/02 ,  B41J23/32

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.