Work edge guiding device for sewing machine

An edge guiding device for guiding a workpiece to be sewn, the workpiece having edges extending at angles to each other and defining at least one inside corner, the workpiece being movable in a feed direction for having seams which are parallel to the edges formed on the workpiece, the edge guiding device comprising an edge ruler defining a guide face extending in a substantially vertical plane parallel to the workpiece feed direction, an actuator connected to said edge ruler for moving said edge ruler between an active and an inactive position, said edge ruler being formed by a central section and two outer sections disposed on opposite sides of said central section, said sections together defining said guide face with each section carrying a portion of said guide face, said edge ruler being movable synchronously with displacement of the workpiece in the feed direction during formation of seams beginning or ending at the inside corner of the workpiece, said actuator including separately controllable actuator portions connected to said central section and to said two outer sections for jointly and independently moving said central and two outer sections.