POWER TRANSMISSION DEVICE

PROBLEM TO BE SOLVED: To enhance strength when a docking gear receives external force, and to miniaturize a supporting part of a fulcrum shaft. SOLUTION: In the power transmission device 51 for transmitting driving force from a body 11a to a driven part in a cartridge 12 attachable and detachable to and from the body part 11a, one end 54 is externally fitted to the fulcrum shaft 53 supported by a casing 24 of the cartridge 12 in a cantilever manner and is rotatable around the fulcrum shaft 53, the docking gear 52 having a fitting part 59a fitted with a driving part of the body 11a and a driving gear 61 fitted with a driven gear 71 connected to the driven part in the casing 24 is fitted to two points of a first fitting part 63 on a fixed end side of the fulcrum shaft 53 and a second fitting part 64 on a free end side, and the docking gear 52 is rotatably supported by the casing 24 by a third fitting part 65 disposed adjacently to the fitting part 59a, and the second fitting part 64 positioned on the free end side of the fulcrum shaft 53 is positioned adjacently to the third fitting part 65 of the docking gear 52. COPYRIGHT: (C)2011,JPO&INPIT