Rotor movement sensing system

Details Rotor movement sensing system Rotor movement sensing system

1993-02-08

1995-02-14

Ro, Bentsu

Electricity: motive power systems

Three-or-more-positions motor controller systems

Return to 'off', 'starting' or 'neutral' positions

377 28, 377 32, 235 47, G06M 312, G07B 1700, H03K 2140

Patent

active

053898630

ABSTRACT:
A rotor movement sensing system in a postage meter permits detection of the printing of postage even if power is lost during the printing cycle. A sensor senses a magnet on a disk when the rotor is substantially past its home position. A second sensor has a magnetic memory element. When the magnet on the disk passes near the memory element, that element is magnetized. A Hall-effect sensor at the memory element provides an interrupt to a processor to indicate magnetization of the memory element. A winding is provided around the memory element. The processor has an output which, when asserted, causes current flow through the winding, demagnetizing the memory element. Alternatively a reed switch senses rotor rotation, a flip-flop provides a bistable latch and its output provides a datum for the processor. An interrupt routine provides that during a routine franking cycle the processor responds to the interrupt, makes record in nonvolatile memory of the occurrence of the printing cycle, and energizes the winding or flip-flop reset. This interrupt routine is executed for each franking cycle when power is continuously available.

REFERENCES:
patent: 4016467 (1977-04-01), Hallenbeck
patent: 4253015 (1981-02-01), McFiggans et al.
patent: 4421023 (1983-12-01), Kittredge
patent: 4774881 (1988-10-01), Schubert
patent: 4864505 (1989-09-01), Miller et al.

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