By pressing the automatic angle detection button on the operation panel when sewing a left flap, the two sensors detect the flap angle to adjust the sewing starting (sewing end) position of the right and left needles when sewing a left flap.
* This function is provided as standard only on left-flap sewing.
* When automatic detection finds a difference of less than 0.5 mm, parallel stitching is performed.
* For the sewing of single welt, the flap-angle detecting sensors cannot be used. Only the flap sensor can be used.