| 摘要 |
Apparatus for transmitting movement to a driven part (510;510,1) idle on a bearing (2d), comprising a shaft (2) on which the driven part (510;510,1) is mounted; movement generating means (11) connected to the shaft (2), an electromagnetic clutch (400) which comprises a rotor (410) axially fixed to and rotationally integral with the shaft (2), a fixed electromagnet (422), and an armature (432) situated axially opposite the electromagnet (422) on the opposite side to the rotor (410), in which said armature (432) has a set of radial inner teeth (432a) able to engage with a corresponding set of teeth (4a) of a bush (4) integral with the shaft (2) together with which it rotates, between the armature (432) and the rotor (410) there being axially arranged resilient means (433) able to keep the armature (432) pushed towards the driven part (510;510,1) and therefore engaged with the teeth (4a) of the bush (4), the armature (432) carries a member (515) able to engage with the driven part (510;510,1), energization/de-energization of the electromagnet (422) causing an idle/rotating condition of the driven part (510;510,1).
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