US 4,192,229 A · Fixing apparatus

Abstract

Apparatus for fixing toner image on a toner image supporting member in electrophotographic copying machine is disclosed. The fixing apparatus includes three rotary rollers which are in contact with each other under the action of pressing means. One of the three rollers has a smaller diameter than the other two rollers. Two rollers with which the toner image supporting member comes into contact are disposed in such a manner that the axes of the two rollers intersect each other and the portion at which the two rollers contact each other or are closest to each other forms a straight line relative to the direction of roller axis. According to one embodiment of the invention, the remaining one roller with which the supporting member does not contact, is formed as a crown roller, that is, a roller which has its largest diameter at the middle portion of the roller.

Claims20

Dependent claims

A pressure fixing apparatus wherein a toner image is fixed on a toner image supporting member by pressure, said apparatus comprising:

first and second rollers for pressing and conveying therebetween the toner supporting member;
and
a third roller press-contacted to said first roller;
said first, second and third rollers being inclined with respect to the direction of conveyance of the supporting member at different angles to make those parts of said first and second rollers which are in contact with the supporting member when the supporting member is pressed therebetween substantially rectilinear substantially in the direction of the axes of the rollers.

1 more element

Dependencies are inferred from the claim text.

Fixing apparatus

Life of this patent

Fixing apparatus

Life of this patent

Abstract

Claims20