With its outstanding performance parameters this series is setting new standards as regards stitching operations in the shoe production. In conjunction with the needle feed and the driven roller foot the double feeding of the wheel bottom feed ensures quiet and smooth sewing with exact stitch length, even when sewing over extremely thick spots. The manual back-tacking device ensures a "stich-in-stich" back-tacking. The special sewing kinematics allowing to use a thread variety unrivalled so far makes this series a promising operating means of universal use.