| 摘要 |
A paper feeder for use in an image forming apparatus for forming images on a printing paper includes a primary paper feeding mechanism which sends out printing sheets one by one at a predetermined speed and a secondary paper feeding mechanism which sends out each of the printing sheets fed from the primary paper feeding mechanism to a printing portion at a speed corresponding to the printing speed of the printing portion. The printing portion is rotated at a speed selected from plural stages of rotational speeds.
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