Dot matrix print head
US4140406A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 13, 1977 |
| Grant date | Feb 20, 1979 |
| Priority date | — |
| Expiry date | Jun 13, 1997 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J2/275
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A printing head for forming dot matrix characters which includes a wire stylus assembly having a plurality of guide bearings spaced to reduce the wear of the tip bearing, and to minimize buckling and resonances. Each stylus is driven by an electromagnetic actuator having a hinged armature, with the stylus drive point at the center of percussion of the armature with respect to the hinge line. Damping is effected at the same point. The armatures are shaped to drive the styli directly in line with the stylus wires without introducing a moment. Individual adjustments for magnetic gap are provided. A retainer device for holding all of the armatures in place during assembly is also provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.