Folder-gluer

A folder-gluer for, with respect to a corrugated paperboard sheet having first to fourth panels and a joint flap serially connected together through respective connection regions, folding each of the first panel and the fourth panel in the connection region thereof and gluing the folded first and fourth panels together through the joint flap, comprising:

• a conveyance device configured to convey the corrugated paperboard sheet;
• a pair of first bending devices, configured to come into contact with respective outside surfaces of the first panel and the fourth panel of the corrugated paperboard sheet being conveyed by the conveyance device, to bend the first and fourth panels from 0 degree to about 90 degrees;
• a pair of second bending devices, configured to come into contact with the respective outside surfaces of the first panel and the fourth panel of the corrugated paperboard sheet being conveyed by the conveyance device, to bend the first and fourth panels from about 90 degrees to 180 degrees;
• a pair of bending members provided in a zone where the first and fourth panels are bent from 0 degree to about 90 degrees, and configured such that distal ends thereof come into contact, respectively, with a crease line formed in a reverse surface of the first panel or a vicinity of the crease line, and a crease line formed in a reverse surface of the fourth panel or a vicinity of the crease line, each of the bending members being movable outwardly in a width direction by a given distance;
• a detection device provided upstream of the bending members, and configured to detect a position of the corrugated paperboard sheet being conveyed;
• a push-out device configured to push and move each of the bending members outwardly in the width direction by a given distance;
• and
• a control device, during a given period of time after the position of the corrugated paperboard sheet being conveyed is detected by the detection device, to control the push-out device to push and move each of the bending members outwardly in the width direction by the given distance to thereby expand a downstream region of each of the first and fourth panels in the width direction.