Top roller for a draft apparatus

When a roller cylinder of a top roller is installed, it may collide against an outer bearing and damage it. Since the roller cylinder is loosened, when drafting is executed at a high speed, the roller cylinder may vibrate, causing non-uniform drafting. A pre-loading spring (30) is installed between an inner bearing (20) and an outer bearing (21) and on the inner circumferential side. Due to the elastic force of the pressurizing spring (30), inner rings (20b) and (21b) of the bearings rotate integrally with a shaft (10). When the roller cylinder (12) is installed, if it collides against the outer bearing (21), the pre-loading spring (30) acts as a buffer to prevent damage to the bearings. O-rings (31) and (32) installed between outer rings (20a) and (21a) of the bearings (20) and (21) fill the gap to prevent the roller cylinder (12) from loosening. As a result, uniform drafting can be executed at a high speed.