Dot matrix line printer
US4625638A · kind A · utility
Inventors
Key dates
| Filing date | May 31, 1984 |
| Grant date | Dec 2, 1986 |
| Priority date | — |
| Expiry date | May 31, 2004 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J11/20
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A dot matrix line printer comprised of a main frame assembly and a shuttle frame assembly hinged thereto for limited pivotal movement around a horizontal hinge axis. The main frame assembly carries a paper drive subassembly and an adjustable platen subassembly. The shuttle frame assembly carries one or more hammer banks and a shuttle drive motor for shuttling each bank to move the hammers thereof along a print row extending across the width of the paper parallel to the front face of the platen. By pivoting the shuttle frame assembly up and away from the main assembly, ready access is afforded to the paper path for loading and to the hammer banks for servicing. Each hammer includes a hammer element mounted on the free ends of first and second spaced parallel leaf springs for linear movement toward and away from a paper to be printed upon. The parallel leaf springs are anchored at one end and biased to impact the hammer element against the paper. A magnet is provided for producing a magnetic force, via a path including a block of magnetic material sandwiched between the springs, to normally hold the hammer element in a retracted position against a pole pin. A coil wound on the pole p…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.