Patent ID: 7204486

Claim:
A sheet discharging apparatus including a conveying means for conveying a sheet on a conveying path, and a high speed discharging means for discharging through an exit of said conveying path, said high speed discharging means being disposed at said exit, and a discharging speed of said high speed discharging means being higher than a conveying speed of said conveying means, said high speed discharging means comprising: a drive shaft; a drive roller rotatably and coaxially attached to said drive shaft, said drive roller being unshiftable in an axial direction of said drive shaft; a frictional connection unit for firmly coupling said drive roller and said drive shaft with frictional force; and a nip roller, idly rotatable, said nip roller nipping said sheet with said drive roller to discharge out said sheet, wherein said frictional connection unit further comprises: a fixing member fixed to said drive shaft; a friction member for frictionally contacting an end surface of said drive roller; and a biasing member provided between said fixing member and said friction member, said biasing member pressing said friction member against, and into frictional contact with, said end surface of said drive roller; wherein said biasing member is a coil spring having a first end and a second end, said first end is fixed to said fixing member, and said second end is fixed to said friction member, and wherein said friction member is provided with a contact portion for contacting said drive roller, and said contact portion is chamfered to have an arc-shape or a linear inclination to an axial direction of said drive roller.