| 摘要 |
A spine formation device (3; 300) includes a sheet conveyer (Rer; 31) to transport a bundle of folded sheets with the folded portion of the bundle forming a front end portion thereof, a clamping unit (325,326; 350) to clamp the bundle from both sides in a direction of thickness, a spine forming member (330; 360) to flatten the folded portion of the bundle, disposed in that order in a sheet conveyance direction, and a controller (110) that causes the sheet conveyer (Rer; 31) to transport the bundle of folded sheets to a first position downstream from an upstream end of the spine forming member (330; 360) in the sheet conveyance direction and to reverse the bundle a predetermined distance from the first position to a second position upstream from the first position in the sheet conveyance direction before the clamping unit (325,326; 350) clamps the bundle.
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