This document describes a work-jogging attachment for a sewing machine with an improved operating mechanism. It includes a pattern cam with a cam groove that is tracked by a follower roller. An anchor link controls the path of the follower roller to an arc, limiting its movement. This arrangement favors the smoother outer wall of the cam groove, reducing effort on the abrupt inner wall and preventing binding of parts. Adjusting the anchor link position can control the symmetry of jogging motion applied to the work.