公开(公告)号：FR2291636A1

公开(公告)日：1976-06-11

申请号：FR7518138

申请日：1975-06-03

Applicant: IBM

Inventor： GILBERT RICHARD L ,  HRYCK MICHAEL D ,  MAKO JOHN

IPC: H02P8/14 ,  H02P8/00

Abstract: The control circuit is used for regulating the movement of a step by step motor having several active windings which are all connected so as to be sequentially exited by selectively actuated switching means. The system includes a series of voltage controlled oscillator circuits which are connected so as to activate the switching means at given time intervals. Also, it has means which function is response to the counter electromotive force which is produced by the active windings. The latter means are connected so as to vary the frequency of the oscillators in response to the variations of the counter electromotive force.

公开(公告)号：DE2404799A1

公开(公告)日：1974-09-19

申请号：DE2404799

申请日：1974-02-01

Applicant: IBM

Inventor： GILBERT RICHARD L ,  HRYCK MICHAEL D ,  MAKO JOHN

IPC: G06F3/12 ,  B41J1/20 ,  B41J7/36 ,  B41J9/46 ,  B41J9/54 ,  B41J29/38 ,  G06K15/08

Abstract: 1435846 Automatic control of printing INTERNATIONAL BUSINESS MACHINES CORP 15 Feb 1974 [5 March 1973] 6902/74 Heading G3N A selective printer comprises a control means for a motor moving a type carrier adapted to vary the speed of the motor in accordance with variations in the value of a common source of energy for the control means and a hammer operating means so as to maintain registration between print hammers and type characters. As shown, an endless type-belt 12 carries type characters 16 on fingers 18 and is driven by a pulley 14 coupled to a stepping motor 30. A plurality of print hammers, such as 22, are electromagnetically actuated by windings 23 energized in timed relationship with marks 20 on the belt. as sensed by a photo-electric device 20 and controlled by a device 24. The motor 30 is stepped by pulses from a device 32. Since the flight-time of a print hammer is related to the voltage applied to the windings 23, the pulse rate of the pulses applied to the motor 30 is varied in correspondence by deriving the pulses from a relaxation oscillator, the charge/ discharge capacitor being fed through a voltage dependent transistor-diode circuit. A gradual initial start-up is provided by biasing the transistor by a ramp generator. The pulses are gated to the stepping-motor windings by a binary counter.