| 摘要 |
<p>A recording-medium positioning device 200 includes a gate 13, a roller pair 16, a roller-pair shift unit 40, a recording-medium detector 17, and a drive control device. The gate 13 is disposed at an upstream side of a fixing device 11 in a conveyance direction of a recording medium 8. The roller pair 16 includes two roller members disposed at an upstream side of the gate 13. The roller-pair shift unit 40 moves the roller pair 16 in accordance with a first position of the recording medium 8 in the conveyance direction to shift the recording medium 8 in a width direction perpendicular to the conveyance direction. The recording-medium detector 17 is disposed between the fixing device 11 and the gate 13 to detect a second position of the recording medium 8 in the width direction. The drive control device moves the recording medium 8 to a reference position 24 by driving the roller-pair shift unit 40 in accordance with the second position and cyclically shifts the reference position 24.
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