| 摘要 |
PURPOSE:To fix a rotary head drum to a rotary shaft only with tightening of fixing screws without shaft deflection, by giving deformation due to elastic strain to a center shaft hole of the rotary head drum. CONSTITUTION:A plurality of opening holes 7 are formed near the circumference of a center shaft hole 5a of a rotary head drum 5 prior to the processing of the hole 5a so that the opening holes 7 have equal intervals mutually. Then, the center shaft hole 5a is shaped and processed and the thickness of external circumference of the center shaft hole 5a where the opening holes 7 exist is formed thin in thickness. This thin part is deformed toward the opening holes 7 during the processing of the hole 5a and restores to the original shape after the processing is finished to deform the hole 5a. This thin part, i.e., a deformed part 5b abuts on an external circumference 4b of a cylinder 4a when the center shaft hole 5a is inserted to the cylinder 4a of a flange 4, a clearance provided between the hole 5a and the external circumference 4b is damped and the centering of the rotary head drum 5 can be done. |
