Matrix print head and solenoid driver
US4016965A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 19, 1975 |
| Grant date | Apr 12, 1977 |
| Priority date | — |
| Expiry date | Aug 19, 1995 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F2007/1692
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A matrix print wire solenoid actuator for a high speed wire matrix printer is disclosed wherein a small diameter print wire is propelled against printing paper and ribbon by the linear motion of the solenoid plunger, to which the print wire is attached, in an improved impact printer having one or more in number and variously arranged print wires for use in dot matrix printing. High magnetic circuit efficiency, high repetition rate and minimized plunger coil heating and plunger mass are achieved by providing a continuous magnetic flux path through the solenoid interrupted only by two working air gaps of low reluctance for generating accelerating force on the plunger during coil energization. The opposing air gap surfaces formed by the plunger and solenoid pole pieces are conical for insuring that both air gaps generate accelerating force on the plunger.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.