BERNINA Foot #1 New Reverse Pattern Foot

The name of this foot is Reverse Pattern Foot, which designates that along with the straight stitch and other forward-motion stitches, it is designed to sew open decorative stitches that move back and forth to sew a stitch pattern. If you look at the sole of Foot #1, you will see indentations in front of and behind the needle opening. The indentations are there to allow the foot to ride smoothly over the thread, as it moves forward and then backward to make a stitch pattern. This foot is not designed to sew satin stitching or heavy decorative stitches. It may drag on the thread build-up and distort the pattern. 

Foot #1 is a good option for simple straight stitching, making it the right choice for seaming, oversewing edges (seam finishing), basic gathering and other simple sewing tasks.