| 摘要 |
An image forming apparatus is provided with a paper sheet feeder for selective feeding from a group of paper sheets in either a first or second cassette. In the paper sheet feeder, first and second registration rollers are provided in front of the first and second cassettes respectively, and a common registration roller is provided in front of a photosensitive drum. When the first group of paper sheets is selected, a first paper sheet is supplied to the first registration roller from the first cassette so that the paper sheet is registered by the first registration roller. The registered paper sheet is supplied to the common registration roller so that the paper sheet is also registered by the common registration roller. When the second group of paper sheets is selected, the second paper sheet is supplied to the second registration roller from the second cassette so that the paper sheet is registered by the second registration roller. The registered paper sheet is supplied to the common registration roller through the first registration roller so that the paper sheet is also registered by the common registration roller.
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