| 摘要 |
PROBLEM TO BE SOLVED: To move the whole of a revolving unit including a planetary gear, in an axial direction based on a device body when a force to further deeply meshing a planetary gear with a solar gear is exerted. SOLUTION: This power transmission device comprises a rotatably driven solar gear 3; a planetary gear 4 engaging with the solar gear; and planetary lever 5 rotatably holding the planetary gear engaged with the solar gear and the planetary gear and revolving around the solar gear integrally with the planetary gear. When the revolving unit is revolved to the position where the planetary gear meshes with a driven gear 10 to transmit a drive force, the revolving unit bumps against a revolution block part 9a disposed at a device body 9, and a power transmission device blocks revolution exceeding the position. In this device, an axial movement blocking means 7b to block axial direction of the revolving unit to a device body when at least the revolving unit bumps against the revolution blocking part is disposed between the revolving unit and the device body.
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