QK-300 coverstitch bottom hemmer

This device can ensure the same seam directions (inside and outside )are well aligned and assist and ensure the stability of overflippingreal seam direction, avoid error detecting on fabric colour,improvethe speed and stability，the knife can be changed easily and fast，realize the expensionand identification the size automatically，achievea real seam direction overflipping，it adopts two rectifying belts in each group to enchancethe stability of the rectifying deviation