When the amount of the wound web 7 reaches a predetermined value, the detector 32 outputs electrical signals by detecting {HEAD ~ the position} of {TAIL ~ the surface} of the outermost convolution of the wound web 7 
When the amount of the wound web 7 reaches a predetermined value , the detector 32 outputs electrical signals by detecting { HEAD ~ the position } of { TAIL ~ the surface } of the outermost convolution of the wound web 7
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH