(57) A spine formation device (3) includes a sheet conveyer (31) to convey a bundle of
folded sheets with a folded portion of the bundle forming a front end of the bundle,
a clamping unit (32,325,326) disposed downstream from the sheet conveyer (31) in a
sheet conveyance direction for squeezing a folded portion of the bundle in a direction
of thickness of the bundle, a contact member (330) against which the folded portion
of the bundle is pressed, disposed downstream from the clamping unit (32,325,326),
an elevation unit (331,332) to move the contact member (330) vertically, and a controller
(3-1). The clamping unit (32,325,326) includes multiple pressure rollers (325b) arranged
in a single line along the folded portion of the bundle, a planar clamping member
(326) disposed facing the multiple pressure rollers (325b) vertically, to press the
bundle against the multiple pressure rollers (325b), and a unit to (325s) move the
pressure rollers (325b) and the clamping member close and away from each other.
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