A folder-gluer for folding and gluing a corrugated paperboard sheet having first to fourth panels and a joint flap serially connected together in a width direction through respective connection regions, the folder-gluer operable to fold the first panel from the second panel along the connection region therebetween and the fourth panel from the third panel along the connection region therebetween and gluing the folded first and fourth panels together with the joint flap glued on the first or forth panel, the folder-gluer comprising:
- a conveyance device configured to convey the corrugated paperboard sheet in a conveying direction, wherein the corrugated paperboard sheet being conveyed is oriented so that the width direction of the corrugated paperboard sheet is in perpendicular to the conveying direction;
- a pair of first bending devices arranged opposite, in the width direction, to each other in a first conveyor segment, the pair of first bending devices configured to come into contact with outside surfaces of the first panel and the fourth panel of the corrugated paperboard sheet being conveyed and bend the first and fourth panels from 0 degree to about 90 degrees, respectively, from the second and third panels;
- a pair of second bending devices arranged opposite, in the width direction, to each other in a second conveyor segment downstream of the pair of first bending devices, the pair of second bending devices configured to come into contact with the outside surfaces of the first panel and the fourth panel of the corrugated paperboard sheet being conveyed and bend the first and fourth panels from about 90 degrees to 180 degrees, respectively, from the second and third panels;
- a pair of plate members provided in the first conveyor segment opposite in the width direction to each other, the pair of plate members having edge lines arranged, respectively, on the pair of plate member opposite to each other in the width direction, the pair of plate members being configured to move outwardly in the width direction so that the edge lines are to move away from each other in the width direction to come into contact, respectively, with a reverse surface of the corrugated paperboard sheet along a crease line formed between the first panel and the second panel, or in a vicinity of the crease line, and with the reverse surface of the corrugated paperboard sheet along a crease line formed between the fourth panel and the third panel, or in a vicinity of the crease line, wherein the pair of plate members;
- in cooperation with the pair of first bending devices, facilitate folding of the first and fourth panels, from 0 degree to about 90 degrees, from the second and third panels along the crease line between the first and second panels and the crease line between the third and fourth panels;
- a detection device provided upstream of the plate members, and configured to detect a position of the corrugated paperboard sheet being conveyed;
- push-out devices configured to push the pair of plate members away from each other in the width direction and thereby move the pair of plate members obliquely outwardly toward downstream of the first conveyor segment so that a distance in the width direction between the pair of plate members is wider on a downstream side of the pair of plate members than a distance therebetween on an upstream side thereof, wherein when the push-out devices push and move the pair of plate members obliquely outwardly, the edge lines are positioned obliquely outwardly toward downstream of the pair of plate members so that the edge lines come in contact with the crease lines obliquely along the crease lines to thereby move downstream regions of the first and fourth panels away from each other in the width direction;
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- a control device configured to operate the push-out devices, during a given period of time after the position of the corrugated paperboard sheet being conveyed is detected by the detection device, to push and move the pair of plate members away from each other in the width direction.