Built-in BERNINA Stitch Regulator (BSR).
The patented BSR is a truly special high-tech presser foot that ensures top-quality stitching when free-motion quilting. When you sew with the BSR and lowered feed dog, your stitch length remains exactly the same all the time, even if the fabric is not always fed at the same speed. The BSR compensates for inconsistency in speed, so that straight and zigzag stitches are always the exact same length. Even those who are relatively inexperienced at free-motion sewing can reliably achieve high-quality results with the BERNINA 580.
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