High speed printer hammer assembly
US4121518A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 12, 1976 |
| Grant date | Oct 24, 1978 |
| Priority date | — |
| Expiry date | Oct 12, 1996 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J9/38
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A high speed printer is provided having a plurality of aligned hammer assemblies for directing hammers at a moving character band for printing characters responsive to the hammer's driving against the character band. The hammer assembly has a striker arm pivotly mounted to a striker assembly frame and which acts as an armature when driven by a pair of magnets. The magnets are attached to the striker assembly frame on opposite sides of the striker arm and on opposite sides of the pivot point for the striker arm so that simultaneously actuating both magnets pulls the striker arm for actuating the hammer. Each magnet has a single coil, with one of the magnets having a reverse polarity from each adjacent magnet on an adjacent assembly, while the other magnet has the same polarity to avoid cross-talk and to increase the speed of the printer. A pressure-sensitive tape is bonded to the striker armature to provide a residual air gap between the armature and magnet poles and improvements are made in the hammer guide combs, return plunger, and the platen.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.