Dot matrix line printer
US4513661A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 4, 1983 |
| Grant date | Apr 30, 1985 |
| Priority date | — |
| Expiry date | Apr 4, 2003 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J2/245
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A dot matrix line printer/plotter apparatus for producing hard copy printout of digitally represented data. The apparatus utilizes one or more hammer banks, each mounted so as to shuttle across a paper web fed therepast. Each hammer bank carries a plurality of hammer assemblies, each of which can be individually actuated to print a dot as it sweeps across the paper. Each hammer bank is mounted on a circuit board which carries electronic circuitry to actuate the hammer assemblies thereon. The circuit boards are supported by leaf springs and driven by a stepper motor which shuttles the boards along linear paths to sweep each hammer assembly across a certain portion of the paper width. Each hammer assembly includes a hammer supported in a guide tube for linear movement between a retracted position and an extended position engaging the paper. A permanent magnet is provided to normally latch the hammer in its retracted position. Each hammer assembly further includes a coil energizable to null the action of the permanent magnet as to that hammer assembly and to thus permit a spring to propel the hammer to said extended position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.