Microprocessor controlled d.c. motor for controlling printing means
US4774446A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 4, 1986 |
| Grant date | Sep 27, 1988 |
| Priority date | — |
| Expiry date | Apr 4, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07B2017/00693
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
An improvement in combination with apparatus including rotary means, wherein the rotary means includes a periphery having indicia printing means and is 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 having a leading edge is linearly displaced a predetermined distance in the path of travel; a d.c. motor coupled to the rotary mean for rotation of the rotary means; a second device for sensing angular displacement of the rotary means 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 rotary means during successive sampling time periods, responds to the second sensing device for providing respective amounts representative of actual angular displacements of the rotary means 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 indicia …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.