US 2006/0051116 A1 · Image forming apparatus

Abstract

An image forming apparatus provided with a pair of transfer rollers for transferring an unfixed image borne on an image bearing member, a pair of fixing rollers changeable in the recording material conveying speed thereof and for fixing the transferred unfixed image on the recording material, a pair of discharging rollers changeable in the recording material conveying speed thereof and for discharging the recording material on which the image has been fixed by the pair of fixing rollers, a loop detecting sensor for detecting the loop state of the recording material between the pair of transfer rollers and the pair of fixing rollers, and a control board for changing over the recording material conveying speed of the pair of fixing rollers on the basis of the detection of the loop detecting sensor so that the loop of the recording material is maintained with a predetermined range, wherein the control board controls the recording material conveying speed of the pair of discharging rollers so as to become equal to the recording material conveying speed of the pair of fixing rollers after the recording material has passed the pair of transfer rollers.

Claims10

Dependent claims

An image forming apparatus comprising:

transferring means for transferring an unfixed image borne on an image bearing member to a recording material;
fixing means changeable in a recording material conveying speed thereof and for fixing the
transferred unfixed image on the recording material;
discharging means changeable in a recording material conveying speed thereof and for discharging the recording material on which the image has been fixed by said fixing means;
loop detecting means for detecting a loop state of the recording material between said transferring means and said fixing means;
and
controlling means for changing over the recording material conveying speed of said fixing means on the basis of a detection of said loop detecting means and controlling the loop of the recording material so as to be maintained within a predetermined range,
wherein said controlling means controls the recording material conveying speed of said discharging means so as to become equal to the recording material conveying speed of said fixing means after the recording material has passed said transferring means.

5 more elements

An image forming apparatus comprising:

a pair of transfer rollers which transfers an unfixed image borne on an image bearing member to a recording material;
a pair of fixing rollers which is disposed downstream of said pair of transfer rollers in a recording material conveying direction and which is changeable in a recording material conveying speed thereof;
a pair of discharging rollers which is disposed downstream of said pair of fixing rollers in the recording material conveying direction and which is changeable in a recording material conveying speed thereof;
a loop detecting sensor which is disposed between said pair of transfer rollers and said pair of fixing rollers for detecting a loop state of the recording material;
and
controlling means for changing over the recording material conveying speed of said pair of fixing rollers on the basis of a detection of said loop detecting sensor so that a loop of the recording material is maintained within a predetermined range,
wherein said controlling means controls the recording material conveying speed of said pair of discharging rollers so as to become equal to the recording material conveying speed of said pair of fixing rollers after the recording material has passed said pair of transfer rollers.

4 more elements

Dependencies are inferred from the claim text.

Image forming apparatus

Life of this patent

Image forming apparatus

Life of this patent

Abstract

Claims10