Microcomputer-implemented control of separate d. c. motors...

Details Microcomputer-implemented control of separate d. c. motors... Microcomputer-implemented control of separate d. c. motors...

G - Physics

05

D

341/107, 354/34

G05D 3/20 (2006.01) G07B 17/02 (2006.01)

Patent

CA 2032633

ABSTRACT OF THE DISCLOSURE An electronic postage meter is disclosed which comprises a plurality of print devices each individually settable to a desired position so that the print devices may print a desired postage value; a plurality of d.c. motors, one for each of the plurality of the print devices, a different one of the d.c. motors being coupled to a different one of the print devices for setting the respective print device to a respective desired posi- tion; actual position sensing means for providing signals related to the actual positions of the print devices; and a microcomputer coupled to the d.c. motors and to the actual position sensing means. The microcomputer in response to signals from the actual position sensing means, a desired postage value and programming of the microcomputer sequentially controls the d.c. motors to set the print devices to respective desired positions for printing the desired postage value. The control loops include low cost, low bandwidth incremental quadrature encoders. The drive ratio of the d.c. motors is reduced, and the encoders sense the actual position of the print devices at a point in the reduced drive ratio, i.e., on the load side of the d.c. motors. The print devices are mounted to a print drum whose rotated position is sensed at its shaft.

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