| 摘要 |
PURPOSE:To accurately obtain coaxialness, by constructing a rotary assembly unit to be rotated with a fixed shaft, equipped with herringbone and spiral grooves on the surface, as the center. CONSTITUTION:A hollowed cylinder 38 having an internal peripheral size, in which a prescribed clearance is formed between the peripheral part of a fixed shaft 33 and said cylinder, is externally fitted rotatably to the fixed shaft 33 equipped with a herringbone groove 36 and a spiral groove 37. By this constitution, coaxialness is accurately obtained because of one bearing as compared with the constitution in which a motor shaft is conventionally mounting a rotary body and a motor rotor is supported by two bearing parts. |
