Topic With former cloth judgment, acquiring angle, or the case where you judge cloth in curved line condition in regard to the preciseness of judgment attention was not paid particularly, could not designate accurate cloth judgment as at that time.Solutions The upper edge of lower blade 75 and the intersection and center axis C of rotary blade 67 are made to cross in the error range of 3mm. Because of this the case which acquires angle and/or judges in curved line condition precision improves. Especially, in order the center of the rotary blade, from the center axis to be located to the traveling direction front, very it is desirable, can do judgment because of this more smoothly to set.
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