Printing wheel setting and aligning apparatus
US4709630A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 21, 1987 |
| Grant date | Dec 1, 1987 |
| Priority date | — |
| Expiry date | Jan 21, 2007 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J29/38
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
Apparatus for printing any line of characters comprises printing wheels on a common shaft, the wheels on the shaft together defining a printing line over a hammer. Each printing wheel is rotated by a respective stepping motor through a respective setting wheel. An aligner bar is inserted into notches in the wheels, prior to printing, to verify the alignment of the characters in printing position. The stepping motors are bi-directional and take the shortest path from a preceding printing position to the next printing position. The pulsing frequency may be ramped to give a higher stepping rate in the intermediate portion of each printing wheel movement.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.