Sheet Material End Detection Mechanism, Roll Body, and Method for Producing Roll Body

Abstract

Provided is a sheet material end detection mechanism including: a sheet material information part indicating information on a sheet material wound around a core member in which a light passing part is formed; a reader configured to optically read the sheet material information part; and a detection unit configured to detect that the sheet material is used up. The sheet material information part is held at an end of the sheet material wound around the core member at a position corresponding to the light passing part. The detection unit detects that the sheet material is present when a read signal of the sheet material information part read by the reader is received and that the sheet material is used up when the read signal disappears.

1 . A sheet material end detection mechanism comprising:
 a roll body constituted by winding a sheet material around a tubular core member;   a holding unit configured to hold the roll body so as to allow the sheet material to be withdrawn;   a sheet material information part provided in the roll body and indicating information on the sheet material;   a reader configured to optically read the sheet material information part of the roll body held by the holding unit; and   a detection unit configured to detect that the sheet material is used up based on results of the reading by the reader, wherein   the core member has a light passing part through which light passes so as to enable the optical reading by the reader from inside to outside,   the sheet material information part is held at an end of the sheet material wound around the core member at a position corresponding to the light passing part, and   the detection unit is configured to detect that the sheet material is present when a read signal of the sheet material information part read by the reader is received and that the sheet material is used up when the read signal disappears, during the withdrawing action to withdraw the sheet material from the roll body held by the holding unit.   
     
     
         2 . A roll body comprising:
 a tubular core member; and   a sheet material wound around the core member, wherein   the core member has a light passing part through which light passes so as to enable optical reading from inside to outside, and   a sheet material information part indicating information on the sheet material is held at an end of the sheet material wound around the core member at a position corresponding to the light passing part.   
     
     
         3 . The roll body according to  claim 2 , wherein
 the sheet material information part is directly formed on an inner surface of the sheet material.   
     
     
         4 . The roll body according to  claim 2 , wherein
 the sheet material has a sheet material body and a mounting part attached to a winding start portion of the sheet material body, and   the sheet material information part is formed on the mounting part.   
     
     
         5 . The roll body according to  claim 2 , wherein
 a through hole passing through the core member in an inward-outward direction is formed in the core member as the light passing part.   
     
     
         6 . A method for producing a roll body by winding a sheet material around a tubular core member, comprising:
 a step of winding the sheet material around the core member; and   a step of forming, on the sheet material, a sheet material information part indicating information on the sheet material as a step before or after the step of winding the sheet material around the core member, wherein   the core member has a light passing part through which light passes so as to enable optical reading from inside to outside, and   in the step of forming the sheet material information part on the sheet material, the sheet material information part is formed on the sheet material so that the roll body in which the sheet material information part is held at an end of the sheet material wound around the core member at a position corresponding to the light passing part is obtained.   
     
     
         7 . The method for producing a roll body according to  claim 6 , wherein
 the step of forming the sheet material information part on the sheet material is performed as a step before the step of winding the sheet material around the core member, and   in the step of winding the sheet material around the core member, the sheet material is wound around the core member so that the sheet material information part is held at the end of the sheet material wound around the core member at the position corresponding to the light passing part.   
     
     
         8 . The method for producing a roll body according to  claim 6 , wherein
 the light passing part is a through hole passing through the core member in an inward-outward direction,   the step of forming the sheet material information part on the sheet material is performed as a step after the step of winding the sheet material around the core member, and   in the step of forming the sheet material information part on the sheet material, the sheet material information part is formed at the end of the sheet material wound around the core member at the position corresponding to the through hole.