Patent ID: 7842448

Claim:
A method of forming fixed images, comprising applying a two-component developer comprising a carrier and a toner comprising a wax and a resin binder comprising a crystalline polyester to a two-component development device with a linear speed of from 500 to 5,000 mm/sec, to develop the toner, wherein the crystalline polyester is contained in an amount of from 3 to 40% by weight and the wax in an amount of from 2.5 to 10% by weight, of the toner, and wherein the two-component development device comprises at least three magnet rollers which are arranged closely to each other along the perimeter of a photoconductor, wherein one magnet roller arranged on the uppermost side in the rotational direction of the photoconductor rotates in a direction opposite to the rotational direction of the photoconductor at the point therebetween, and the other magnet rollers rotate in the same direction as the photoconductor at the point therebetween, wherein after printing 150,000 sheets, toner is fused to the surface of the carrier in an amount such that the difference in triboelectric charges (ΔQ/M) before printing and after printing said number of sheets is ± 4.5 μC/g, and wherein the carrier is a magnesium-based ferrite carrier coated with a resin comprising an acrylic resin and a fluororesin.