| 摘要 |
An electromagnetic coupling device incorporated into a copy machine to convert a rotating and driving force from a driving source into a rotating force as required to supply it to a driven side; the device comprising a rotating member rotatively driven, a main shaft (1) positioned on the center side of the rotating member in order to remove the converted rotating force outside the device, a rotor (2) rotating the main shaft a yoke (6a) for applying an electromagnetic force to the rotor, and a holder (21) secured to the yoke (6a) to the rotor in order to prevent the associated turning of the yoke (6a) with the rotor (2); wherein in the respective joined surfaces of the yoke and the holder, concave portions and convex portions of the number and shape corresponding thereto are formed, and these corresponding concave and convex portions are brought into engagement so that the yoke and the rotor are integrated; whereby providing the simplification of assembling work for both the elements, positive anti-associated turning of the rotor, and the enhancement of the workability of the assembling for both the elements during the ante and posterior operating steps.
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