Bernina 740 Manual - Page 39

AUTOMATIC BUTTONHOLE SEWING There are three oil/kraut kinds o/ buttonholes: a> The oMinary buttonhole la) The buttonhole with cord inlay c) The raised buttonhole The ordinary buttonhole This is sewn wilh normal under thread tension, with a special threading of the bobbin vase. The sewing of the buttonhole is performed without turning the cloth around. This can be made cithtr step by ;km the sewing machine being stopped after each operation, or in one working process i.e. without interrupting the various working stages_ It will, however, be well to learn the hewing of buttonholes step by step; after some time you will be able to sew the entire buttonhole in one single working process as well. Threading sof the tinder thread: v., An increased tension of the under thread produces still better results when sewing buttonholes. To got this higher bottom thread tension without changing the lower tension itself, which is correctly set for normal sewing fsec fig. 50), a hole has been drilled through the finger of the bobbin CSSe. For normal sew- ing the bobbin case is threaded tut explained on page 12. 38 favorit Fi ef. Si 9