Microprocessor controlled d.c. motor and application therefor

Boots – shoes – and leggings

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364174, 318604, 318696, 318327, 101 91, G06F 1520, H02P 506, H02K 3700

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046316817

ABSTRACT:
An improvement in combination with a postage meter including a rotary drum having a periphery adapted for feeding a sheet in a path of travel. The improvement comprises: a first device for sensing a time interval during which a sheet is linearly displaced a predetermined distance in the path of travel; a d.c. motor coupled to the drum for rotation of the drum; a second device for sensing angular displacement of the drum; and a computer coupled to the first and second sensing devices and to the d.c. motor; wherein the computer responds to the first sensing device for providing respective amounts representative of desired angular displacements of the drum during successive sampling time periods, responds to the second sensing device for providing respective amounts representative of actual angular displacements of the drum during successive sampling time periods, compensates for the difference between desired and actual angular displacements and generates a d.c. motor control signal for controlling rotation of the motor to cause the linear displacement of the periphery of the drum to substantially match the linear displacement of the sheet during respective sampling time periods.

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patent: 4584647 (1986-04-01), Eckert

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