Method and device for producing box of corrugated board sheet

A device for producing a plurality of corrugated board boxes, the device comprising:

• a creasing unit configured to crease a corrugated board having a size of the plurality of corrugated board boxes;
• a slitting unit configured to slit the corrugated board;
• a gluing unit configured to apply glue to the corrugated board;
• a folding unit configured to fold the corrugated board;
• a cutting unit configured to cut 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, the cutting unit being located between a set of the creasing unit and slitting unit and a set of the gluing unit and folding unit;
• a speed increasing unit configured to increase a speed of transferring the plurality of pieces each having the size of one corrugated board box toward a subsequent step so as to space the plurality of pieces by a set distance;
• a space detection unit which is arranged on a downstream side of the speed increasing unit and is configured to detect a distance between the plurality of pieces having been cut;
• and
• a controller which is configured to control 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.

A device for producing a plurality of corrugated board boxes, the device comprising:

• a creasing unit configured to crease a corrugated board having a size of the plurality of corrugated board boxes;
• a slitting unit configured to slit the corrugated board;
• a gluing unit configured to apply glue to the corrugated board;
• a folding unit configured to fold the corrugated board;
• a cutting unit configured to cut 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, the cutting unit being located between a set of the creasing unit and slitting unit and a set of the gluing unit and folding unit;
• a speed increasing unit configured to increase a speed of transferring the plurality of pieces each having the size of one corrugated board box toward a subsequent step so as to space the plurality of pieces by a set distance;
• a space detection unit which is arranged on a downstream side of the speed increasing unit and is configured to detect a distance between the plurality of pieces having been cut;
• and
• a controller which is configured to control the distance between the plurality of pieces based on a detection value from the space detection unit.