Microprocessor controlled d.c. motor for controlling a postage meter
US4636959A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 4, 1984 |
| Grant date | Jan 13, 1987 |
| Priority date | — |
| Expiry date | Oct 4, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S388/93
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
In combination with a postage meter which includes a plurality of loads, a source of supply of motive power for driving the respective loads and instrumentalities for selectively coupling the source of motive power to the respective loads, there is provided an improvement which comprises: the motive power source including a d.c. motor having an output shaft adapted to be selectively coupled to the respective loads; means for sensing angular displacement of the motor output shaft; a microprocessor comprising a clock for generating successive sampling time periods, means for providing first counts respectively representative of successive desired angular displacements of the motor output shaft during successive sampling time periods, means responsive to the sensing means for providing second counts respectively representative of actual angular displacements of the motor output shaft during successive sampling time periods, and means for compensating for the difference between the first and second counts during each successive sampling time period and generating a pulse width modulated control signal for controlling the d.c. motor, the motor control signal causing the actual angular d…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.