Photocopying – Contact printing – Light boxes
Patent
1991-10-01
1993-02-09
Grimley, A. T.
Photocopying
Contact printing
Light boxes
355208, 355282, 318696, 3889075, G03G 2100
Patent
active
051856271
ABSTRACT:
An electrophotographic printer 10 having a control system 51 for controlling a stepper motor 50. The control system 51 includes a motor speed drive circuit 52, a microprocessor 54, and a clock 58. The motor speed drive circuit 52 has a programmable driver 56 and a logic circuit 60. The microprocessor 54 outputs a speed change value each time a change in the stepper motor is desired. The programmable driver 56 stores the speed change value and incrementally counts down from the speed change value to zero in synchronization with a clock pulse from the clock 58. Upon reaching zero, the programmable divider 56 outputs a speed command signal to the logic circuit 60, which in turn outputs drive signal to control the operation of the stepper motor 50. The microprocessor 54 only outputs a new speed change value when a change in stepper motor operation is desired. If no change is desired, the programmable divider 56 uses the last input speed value to control the stepper motor. As a result, the microprocessor 54 does not constantly interact with the stepper motor 50, and is therefore free to perform other processing tasks.
REFERENCES:
patent: 3909125 (1975-09-01), Reehil et al.
patent: 4926270 (1990-05-01), Sakamoto
patent: 4928141 (1990-05-01), Poehlein et al.
patent: 5107194 (1992-04-01), Pehlein
patent: 5117171 (1992-05-01), Bonss
Grimley A. T.
Output Technology Corp.
Stanzione P. J.
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