| 摘要 |
A planetary gear mechanism is assembled into a pump unit frame with an ink supply pump, a buffer purge pump, a suction pump, a motor shaft gear, and a wiper member. The buffer purge pump and the suction pump are configured to be selectively driven by switching rotational direction of a motor having the motor shaft gear. The planetary gear mechanism transmits drive force from the motor shaft gear to the buffer purge pump or the suction pump in accordance with rotational direction. The buffer purge pump and the wiper member are selectively driven by the rotations of the motor rotating in the same direction in phase-dependent on the rotations of the motor.
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