Apparatus for printing on both sides of an image printing medium

Details Apparatus for printing on both sides of an image printing medium Apparatus for printing on both sides of an image printing medium

1998-01-20

2000-02-29

Beatty, Robert

Electrophotography

Image formation

Transfer

399333, 399384, G03G 1522

Patent

active

06032015&

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.

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