Patent ID: 8579777

Claim:
A method of producing a plurality of corrugated board boxes, the method comprising steps of: creasing a corrugated board sheet having a size of the plurality of corrugated board boxes; slitting the corrugated board sheet; after the creasing and slitting steps, cutting the corrugated board sheet into a plurality of pieces each having a size of one corrugated board box along a cutting line intersecting a conveyance direction that is in parallel with a production line of the corrugated board box; after the step of cutting the corrugated board sheet and before gluing and folding, transferring the plurality of pieces each having the size of one corrugated board box at an increased speed toward a subsequent step so as to space the plurality of pieces by a set distance: detecting a distance between the plurality of pieces having been cut, by a space detection unit which is arranged on a downstream side of the speed increasing unit; and controlling the distance between the plurality of pieces based on a detection value from the space detection unit, wherein the space detection unit comprises two sensors provided on both sides of one of the pieces which has just been cut, for detecting the both ends of the one piece at a time.