78 1 which knot should be adjusted in front of the buttonhole machine?
Just adjust the hook mechanism and the shuttle. According to the relevant public information, before starting the buttonhole machine, it is necessary to check whether the upper and lower threads are correct, whether the tightness is appropriate, and adjust the hook line before knotting. The buttonhole machine is a very important equipment in garment machinery, which is mainly used to process buttons on various garments.