Notch forming apparatus, bookbinding apparatus and bookbinding system

Abstract

A control section of a notch forming apparatus shifts a position of a notch in the first direction for every single sheet or for every plural sheets. When number of the sheets on which the notch is formed reaches at a criterion number, the position of the notch is shifted to a second direction which is an opposite direction in respect to the first direction.

1 . A notch forming apparatus, comprising:
 a notch forming section to form a notch at an edge of a sheet;   a move section to move a position of the notch to be formed through the notch forming section on the sheet; and   a control section to control at least the move section so that the position of the notch to be formed is moved in a first direction every time the notch is formed on the single sheet or a plurality of the sheets, and when number of sheets on which the notch is formed reaches at a criterion number, the position of the notch to be formed is moved in a second direction opposite to the first direction.   
     
     
         2 . The notch forming apparatus of  claim 1 , wherein the move section moves the notch forming section to move the position of the notch to be formed. 
     
     
         3 . The notch forming apparatus of  claim 1 , wherein a sheet bundle is formed by biding a plurality of the sheets on which the notches are formed by the notch forming section, and the control section controls at least the move section so that a width of a groove formed by the notches on the sheet bundle is not less than 0.5 mm and not more than 1.5 mm. 
     
     
         4 . A bookbinding apparatus, comprising;
 the notch forming apparatus of  claim 1 , and   a bookbinding section to form a sheet bundle by accumulating the sheets on which the notch is formed though the notch forming apparatus and to form a booklet by binding the sheet bundle thereof with an adhesive.   
     
     
         5 . A bookbinding system, comprising;
 an image forming apparatus to form an image on a sheet; and   the bookbinding apparatus of  claim 4  to form the booklet using the sheet on which an image is formed by the image forming apparatus.