Patent ID: 7260348
Filing Date: 2007-08-21
Classification: G03G

Abstract:
1. An image-forming apparatus comprising: a toner-supplying roller that rotates; a developing roller that rotates in contact with said toner-supplying roller and receives toner from said toner-supplying roller, the toner having either a glass transition point not higher than 67° C. or a softening point not higher than 120° C.; wherein said developing roller and said toner-supplying roller are configured to meet a parameter F such that where θ is an angle of slide (degrees) of said developing roller, δ is a nip (mm) formed in said toner-supplying roller in contact with said developing roller, Asp is a hardness (degrees) of a surface of said toner-supplying roller, the hardness being measured with an Asker Type F durometer, Vsp is a circumferential speed (mm/sec) of said toner-supplying roller, and Vdv is a circumferential speed (mm/sec) of said developing roller and is higher than 150 mm/sec.