Dot matrix printer
US4661002A · kind A · utility
11Cited by
5References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 3, 1986 |
| Grant date | Apr 28, 1987 |
| Priority date | — |
| Expiry date | Jul 3, 2006 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J2/275
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A dot matrix printer has a vertical array of wires for printing on paper, pivotal armatures having plungers, coils wound around cores, main and auxiliary yokes the latter of which has drawn inner and outer peripheries, and posts at positions of the auxiliary yoke corresponding to the shortest paths of magnetic fluxes generated by the coils. Displacement of the auxiliary yoke upon pivotal movement of armatures is minimized to keep a constant gap between the cores and the plungers and to reduce noise. The reluctance of the magnetic circuit is small to improve magnetic efficiency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.