Creasing and folding machine

Abstract

A creasing and folding machine includes a creasing mechanism ( 1 ) for forming creases on a sheet (S); a folding mechanism ( 2 ) for folding the sheet (S) along the creases; and a controller ( 3 ). A creasing section ( 45 ) comprises first and second creasing units ( 4,5 ). The first creasing unit ( 4 ) comprises a first convex block ( 40 ); and a first concave block ( 41 ) opposite to a second surface (S 2 ) of the sheet. The first convex and concave blocks ( 40, 41 ) are moved toward each other to form a first crease ( 400 ). The second creasing unit ( 5 ) comprises a second concave block ( 51 ); and a second convex block ( 50 ) opposite to the second surface (S 2 ) of the sheet. The second recess and convex blocks ( 51, 50 ) are moved toward each other to form a second crease ( 500 ).

1 . A creasing and folding machine, comprising:
 a creasing mechanism for forming a plurality of creases on a sheet;   a folding mechanism for receiving the sheet from the creasing mechanism and folding the sheet along the creases; and   a controller for controlling operations of the creasing mechanism and the folding mechanism; wherein   the creasing mechanism comprises:
 a conveying roller for conveying the sheet; and 
 a creasing section for creasing the sheet which is delivered from the conveying roller; wherein 
   the folding mechanism comprises:
 a plurality of folding knives for pressing the sheet along the creases at edges of the folding knives; and 
 a plurality of pairs of folding rollers each of which is composed of two folding rollers disposed opposite to each other with a gap therebetween, the gaps being opposite to the edges of the folding knives; wherein 
   the sheet is pressed by the folding knives so as to be inserted into the gaps and folded along the creases; wherein   the creasing section comprises:
 first and second creasing units aligned in a conveying direction of the sheet; wherein 
   the first creasing unit comprises:
 a first convex block opposite to a first surface of the sheet; and 
 a first concave block opposite to a second surface of the sheet, the first convex and concave blocks being moved toward each other so as to forma first crease of the creases which provides a recess on the first surface of the sheet and a protrusion on the second surface of the sheet; and wherein 
   the second creasing unit comprises:
 a second concave block opposite to the first surface of the sheet; and 
 a second convex block opposite to the second surface of the sheet, the second recess and convex blocks being moved toward each other so as to form a second crease of the creases which provides a protrusion on the first surface of the sheet and a recess on the second surface of the sheet. 
   
     
     
         2 . The creasing and folding machine according to  claim 1 , wherein
 when the sheet is a heavy paper sheet, the controller controls the creasing and the folding mechanisms in such a way that the folding knives press a protrusion side of the first or second crease.   
     
     
         3 . The creasing and folding machine according to  claim 1 , wherein
 when the sheet is a thin paper sheet, the controller controls the creasing and the folding mechanisms in such a way that the folding knives press a recess side of the first or second crease.   
     
     
         4 . The creasing and folding machine according to  claim 1 , wherein
 the folding mechanism comprises:
 the pairs of the folding rollers including two folding roller pairs, a first folding roller pair of the two folding roller pairs composed of a first folding roller and a second folding roller, and a second folding roller pair of the two folding roller pairs composed of the second folding roller and a third folding roller; and 
 the folding knives including first and second folding knives; wherein 
   first folding unit is composed of the first folding roller pair and the first folding knife, wherein   a second folding unit is composed of the second folding roller pair and the second folding knife, wherein   the first folding unit folds the sheet in such a way that the first folding knife presses the first or second crease from the second surface of the sheet to the first surface of the sheet and inserts the sheet into the gap between the first and second folding rollers, wherein   the second folding unit folds the sheet in such a way that the second folding knife presses the first or second crease from the first surface of the sheet to the second surface of the sheet and inserts the sheet into the gap between the second and third folding rollers, and wherein   when the sheet is a heavy paper sheet, the controller controls the creasing and the folding mechanisms in such a way that the second creasing unit forms the second crease after the first creasing unit forming the first crease, and the first folding knife presses the protrusion side of the first crease, and then the second folding knife presses the protrusion side of the second crease.   
     
     
         5 . The creasing and folding machine according to  claim 1 , wherein
 the folding mechanism comprises:
 the pairs of the folding rollers including two folding roller pairs, a first folding roller pair of the two folding roller pairs composed of a first folding roller and a second folding roller, and a second folding roller pair of the two folding roller pairs composed of the second folding roller and a third folding roller; and 
 the folding knives including first and second folding knives; wherein 
   a first folding unit is composed of the first folding roller pair and the first folding knife, wherein   a second folding unit is composed of the second folding roller pair and the second folding knife, wherein   the first folding unit folds the sheet in such a way that the first folding knife presses the first or second crease from the second surface of the sheet to the first surface of the sheet and inserts the sheet into the gap between the first and second folding rollers, wherein   the second folding unit folds the sheet in such a way that the second folding knife presses the first or second crease from the first surface of the sheet to the second surface of the sheet and inserts the sheet into the gap between the second and third folding rollers, and wherein   when the sheet is a thin paper sheet, the controller controls the creasing and the folding mechanisms in such a way that the first creasing unit forms the first crease after the second creasing unit forming the second crease, and the first folding knife presses the recess side of the second crease, and then the second folding knife presses the recess side of the first crease.