Motor control method and apparatus, time recorder having same and impact type printing apparatus
US6601513B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | May 24, 2000 |
| Grant date | Aug 5, 2003 |
| Priority date | — |
| Expiry date | May 24, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07C1/14
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A motor control method and apparatus for stopping an object moved by a motor accurately at a predefined target position, shortening the time period required in stop control, in which the motor is driven at a first (high) speed up to a distance from the target position adequate for stop control and then is sequentially braked to a predetermined speed lower than the first speed, driven at a second (low) speed up to a distance from the target position equal to the stopping distance, and braked to a stop. The method and apparatus are used in a time recorder.An impact printing apparatus is also disclosed with printing pin actuation timing correction dependent upon scanning speed or platen shape, striking duration timing dependent upon scanning rate, or printing pin actuation timing dependent upon stored shift amounts.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.