Patent ID: 8474807
Filing Date: 2013-07-02
Classification: B42C,B65H,G03G

Abstract:
1. A spine forming device comprising: a spine forming unit configured to form a folding portion of a sheet bundle into a flat shape, the folding portion being a back-face portion of the sheet bundle having been folded in middle before entering the device; a first conveying unit configured to deliver the sheet bundle which has been folded in middle, the first conveying unit includes a pair of rotating members each having a rotating axis thereof; a second conveying unit configured to deliver the sheet bundle which has been folded in middle toward the first conveying unit; and a driving unit configured to drive the first conveying unit, wherein: the spine forming unit is disposed between the first conveying unit and the second conveying unit to flatten out the folding portion in a direction from a leading end of the folding portion and in a direction from both sides of the folding portion, the first conveying unit is driven by the driving unit so that the first conveying unit takes a retracted position where no driving force is exerted on the sheet bundle, before the folding portion of the sheet bundle enters the first conveying unit, and so that the first conveying unit takes an abutting position to abut on the sheet bundle to exert conveying force on the sheet bundle, after the folding portion of the sheet bundle enters the first conveying unit, the first conveying unit takes an initial position in addition to the retracted position and the abutting position, and the driving unit controls the first conveying unit in such a manner that a distance between the rotating axes at the retracted position is greater than a distance between the rotating axes at the abutting position, and the distance between the rotating axes at the abutting position is greater than a distance between the rotating axes at the initial position.