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We always use tape to paste material,ex: Book cover, paper , envelope, but we only can rely on
our eyes to guess the length and tear tape.Tape always too long or too short, and tore tape was not beautiful and very wasteful, if we can know how length to be used of tape. It is very convenient and economize use of tape.
Of course, just need to change part of axis module, this device also can used in other ribbon, such as ribbon, rope, and wool..etc.
National Cheng Kung University
I Jui Lee