| 摘要 |
An automatic both-side feed unit incorporated in a copy machine automatically reverses paper sheets, each having its one side printed with an image by the printing section, and re-feeds them to the printing section. The automatic both-side feed unit has a stacker for containing, in a stacked manner, paper sheets, each having passed through the printing section and hence having its one side printed with an image, stacking rollers for introducing paper sheets into the stacker, a stacking gate for pressing, in a stacking direction, the paper sheets stacked in the stacker, a pickup roller for sequentially picking up the paper sheets, stacked in the stacker, in a reverse direction, beginning from the lowest one, and a paper re-feed conveyance path for re-feeding each paper sheet picked up by the pickup roller, to the printing section. Further, the stacker contains a pair of openable/closable side guides driven to repeatedly open and close to align both side edges of the paper sheets stacked in the stacker. The side guides are operated when each paper sheet is in a released state assumed after the rear end of the sheet passes through the stacking rollers and before the sheet is stacked by the stacking gate, thereby aligning paper sheets introduced into the stacker. After being aligned by the side guides, each paper sheet is stacked by the stacking gate and picked up by the pickup roller to the paper re-feed conveyance path.
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