| 摘要 |
A unit which can be attached removably to the main body of an apparatus includes a coupling which receives rotary drive from the main body of the apparatus. The main body of the apparatus includes a coupling which engages with the coupling of the unit. At least one of these couplings can be pushed in the direction parallel with the axis of rotation and one coupling is provided with a chamfer. When the unit is attached or detached, one coupling is pushed in by the chamfer and the coulings are disengaged. |
