机械传动。圆盘键。尺寸和公差。
Mechanical transmissions. Woodruff keys. Dimensions and tolerances.
传动装置连接全部采用无键连接，拆卸简单，维修方便。
Transmission device all adopt no key links, disassembled, convenient maintenance.
传动齿轮免键连接，保证长期印刷精度。
Transmission gears are joined together with no bonds, which ensures long-term printing precision.
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