| 摘要 |
PURPOSE: A cooling device of a photoconductive drum is provided to reduce an extra driving unit by rotating a cooling fan by rotary force of a photoconductive drum. CONSTITUTION: A cooling fan(112) is installed inside a photoconductive drum(110). If a photoconductive drum driving unit rotates at a certain speed, the cooling fan rotates at the same speed as the photoconductive drum driving unit. Air flows in the photoconductive drum through an open hole(143a) of a flange(143) of the photoconductive drum by absorption force of the cooling fan, and flows in another open hole(143d) of the flange, thereby reducing a temperature of the photoconductive drum and a peripheral temperature. An idle gear(150) connected with a photoconductive drum driving gear(146) reduces speed of revolution to be transmitted to a photoconductive drum gear(149). The photoconductive drum gear rotates a hub(147) at a predetermined speed of revolution, and the flange and the hub of the other end rotate at the predetermined speed, so the photoconductive drum rotates at a speed lower than the speed of revolution of the cooling fan.
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