Serial printer
US4420267A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 23, 1981 |
| Grant date | Dec 13, 1983 |
| Priority date | — |
| Expiry date | Dec 23, 2001 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J1/50
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A serial printer of the type in which a column shift of a carriage carrying a type wheel is effected through a mutual engagement between the rack and the screw member. A first and a second screw members are splined to a common shaft adapted to be driven by a suitable power source. The first and second screw members are rotatably carried by a first and a second carriages having reset positions defined at opposite ends of the printer. The first and the second screw members have screw threads inclined in opposite directions and adapted to mesh with the teeth of a common rack which is slidable over a predetermined stroke in the column-shift direction and adapted to be driven by a suitable driving member. By making the type wheels rotate by a number greater than that required for ordinary type selecting operation, the rack is slided by the driving member to selectively engage one of the first and second screw members thereby to shift the selected one of carriages.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.