Print wheel control
US4078485A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 17, 1976 |
| Grant date | Mar 14, 1978 |
| Priority date | — |
| Expiry date | May 17, 1996 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J1/34
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A control system for operating a single high-speed print wheel is disclosed. The control system includes a print wheel drive motor having a coded disc with transparent portions forming a four-level Gray code for indicating the position of the print wheel. An optical and electronic system is used for positioning the print wheel and also for the purpose of providing an electronic detent which uses the motive power of the print wheel drive for holding the print wheel in selected printing positions. A similar optical and electronic system is used for controlling a paper advance mechanism. The disclosed system also includes a print hammer with a voice coil type drive to permit positive, bidirectional hammer control.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.