9910B:

Features: Double wheel and needle feed smooth sewing operation of upper and lower leather con-stand working ability.The combined for stitched of wheel and needle ensures constant stitches in both thick and thin sewing operation.When spongy material is sewn,it will not transform.it shall be sewn very smoothly and neatly.Needle clamp with an extra setting plate,let sewn are stably.several leather are sewn together ensures less discrepancy in stitching.Suitable for AC servo retainermotor and using solenoid automatic backtracking system(optional)which keep constant stitches and stitch numbers in beginning and using back-tracking during sewing.Pressing light on the control menu of backtracking would make sewing lightness.That endanger sewing efficiency.including backtracking lever in order to make user operating convenient.