| 摘要 |
An spine formation device (3) includes a sheet conveyer (31), a contact member (330) including a first row (mA) of grooves provided in a contact surface (330a) thereof to house a projection (H) projecting from a folded portion (SB1) of a bundle of folded sheets, a driving unit (331) to move the contact member (330), first and second sandwiching units (32,325,326) to squeeze the bundle, a discharge unit (335,340,341), and a controller (3-1). The first row (mA) of grooves extends in parallel to the folded portion of the bundle and includes at least a first pair of grooves (m1,m2) inclined in different directions with an interval therebetween varying in size with location of the grooves in a first direction perpendicular to a sheet conveyance direction. The contact member (330) is moved to change the size of interval between the first pair of grooves (m1,m2) at a position aligned with the projection projecting from the folded portion of the bundle.
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