SHEET MATERIAL SHORTAGE DETECTION MECHANISM, ROLL BODY, AND MANUFACTURING METHOD OF ROLL BODY

摘要

PROBLEM TO BE SOLVED: To easily detect shortage of a sheet material of a roll body.SOLUTION: A sheet material shortage detection mechanism comprises: a sheet material information section 13 which shows information on a sheet material 12 wound to a core member 11 in which a through hole 111 is formed; a reading section which optically reads the sheet material information section 13; and a detection section which detects shortage of the sheet material 12. The sheet material information section 13 is formed over a portion of an end wound to the core member 11 in the sheet material 12 corresponding to the through hole 111 and a portion in close contact with the through hole 111 on an inner surface 112 of the core member 11. The detection section is configured to detect that there is the sheet material 12 when receiving a reading signal obtained by reading the sheet material information section 13 by the reading section during an operation of drawing the sheet material 12, and detect shortage of the sheet material 12 when receiving no reading signal.SELECTED DRAWING: Figure 2