Apparatus for printing on both sides of an image printing medium by one process
US6032015A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 20, 1998 |
| Grant date | Feb 29, 2000 |
| Priority date | — |
| Expiry date | Jan 20, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G2215/2083
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A fixing system for fixing toner images onto an image printing system such that the image printing medium bearing the toner images on the obverse side and the reverse sides thereof is passed through a nip area between a pair of fixing rollers. In the nip area, a rotation speed of a first fixing roller, which comes into contact with a not-yet fixed toner image, which is formed on the obverse side of the image printing medium, is set to be substantially equal to a rotation speed of a second fixing roller, which comes in contact with a not-yet fixed toner image, formed on the reverse side of the image printing medium. This is accomplished by setting the diameters of the various layers of the first fixing roller to be equal to that of the second fixing roller. When the image printing medium is moved through the nip area by the fixing rollers, a moving speed of the upper side of the image printing medium is equal to that of the lower side thereof. Thus, stresses on the image printing medium are not caused, and no character blur takes place.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.