{HEAD ~ The reel changer} 26 is provided with a reel holding lever 31 turnably holding the reels 30a and 30b, and {TAIL ~ a detector} 32 for measuring the amount of the web 7 wound around the reel 30a or 30b 
{ HEAD ~ The reel changer } 26 is provided with a reel holding lever 31 turnably holding the reels 30a and 30b , and { TAIL ~ a detector } 32 for measuring the amount of the web 7 wound around the reel 30a or 30b
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