| 摘要 |
PROBLEM TO BE SOLVED: To provide a single spindle-driving type multiple twister enabling a driving power of a motor to be sufficiently manifested, and a spindle shaft to be stably rotating at a high speed. SOLUTION: A housing 34 of a driving motor 10 is constituted of a motor- supporting part 26 having a stator coil 32 fixed to the inner periphery, an upper supporting member 27 attached to the upper end part of the motor-supporting part 26 and supporting a spindle shaft 4 through a bearing 27a, and a lower supporting member 28 attached to the lower end part of the motor-supporting part 26 and supporting the spindle shaft 4 through a bearing 28a. The motor- supporting part 26 in made of a nonmagnetic material, and the upper supporting member 27 and the lower supporting member 28 are made of a material having a rigidity higher than that of the motor-supporting part 26.
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