Abstract: A sewing machine for the generation of an edge-parallel seam in a workpiece with at least one projecting zone. The sewing machine has an edge-guide member, a supporting surface, a presser foot and a feeding device for the workpiece. The edge-guide has two stop members arranged laterally and in front of and behind the needle viewed with respect to the feed direction. The stop members are relocatable into various positions. At least one of the stop members is additionally relocatable into a lifted position with respect to the supporting surface.

Abstract: A sewing device with a sewing head and a feeding device for generating a two-axis-relative motion of a constant velocity between a workpiece to be stitched wherein the sewing head has a rotary housing pivoted about an axis of rotation at the sewing head. In the housing, a needle bar including a needle is pivoted and the needle bar essentially extends about the axis of rotation. The housing further has a common drive for a thread take-up means and a crank including a jogging gear, wherein the two latter cooperate to produce a needle feed movement. The rotary housing is rotatably controlled together with a bearing bracket including a hook, in order to render possible sewing of a stitch contour, wherein the needle feed movement is tangentially guided relative to the individual sewing direction.The drive connection between the main drive shaft and the drive elements incorporated in the rotary housing are constructed of a double timing belt pulley concentrically pivoted with respect to the axis of rotation.

Abstract: A sewing machine with a workpiece feed comprises a feed dog positioned below the workpiece providing a four-motion feed movement. A presser foot is fixed to a presser foot bar and can be raised from the workpiece during the stitching cycle by a lifting gear to ensure turning of the workpiece. This makes it possible to follow complicated seam patterns. The lifting gear is constructed in such a way that the presser foot is raised from the workpiece while the needle perforates the material, during its downwardly directed movement approximately up to its bottom dead center position.

Abstract: A feed gear of a sewing machine for reversibly driving a rotary feed dog, as for example, a conveyor belt, a chain or a feed wheel, having a first gear part for producing an oscillating movement, and a second gear part for converting the oscillating movements into reversible intermittent rotary movements. The second gear part is provided with oppositely arranged driven one-way couplings.

Abstract: A sewing machine has a feed for the workpiece which is to be sewn. A workpiece conveyor performs a skipping feed movement below the workpiece. Above the workpiece a turning device enables the workpiece to be turned about an axis which is coincident with the needle. In order to sew in an edge-parallel manner with an automatic guidance, workpieces made from soft materials with curved or angular seam courses, may be turned responsive to air nozzles directed in acutely-angled manner on to the supporting plate. The air nozzles are arranged tangentially, and in spaced manner, with respect to the needle.

Abstract: In a sewing machine a workpiece feeding device having a lower feeding member intermittently and reversably driven and an upper feeding member in a steady contact with the workpiece and drivingly connected to the lower feeding member by means of connecting elements including one-way coupling means and a device arranged between the latter and the upper feeding member for interrupting or reversing the upper feed motion simultaneously when reversing the lower feeding member; different embodiments are described.

Abstract: In a sewing machine a workpiece feeding device having a lower feeding member intermittently and reversably driven and an upper feeding member in a steady contact with the workpiece and drivingly connected to the lower feeding member by means of connecting elements including one-way coupling means and a device arranged between the latter and the upper feeding member for interrupting or reversing the upper feed motion simultaneously when reversing the lower feeding member; different embodiments are described.

Abstract: In a sewing machine a workpiece feeding device having a lower feeding member intermittently and reversably driven and an upper feeding member in a steady contact with the workpiece and drivingly connected to the lower feeding member by means of connecting elements including one-way coupling means and a device arranged between the latter and the upper feeding member for interrupting or reversing the upper feed motion simultaneously when reversing the lower feeding member; different embodiments are described.

Abstract: A trimming mechanism for a sewing machine for cutting the edges of a workpiece in the feeding direction by means of a reciprocating trimmer blade cooperating with a stationary counterknife. While sewing at high speed the trimmer blade is driven by the arm shaft of the sewing machine normally in synchronism with the needle. Drive- and control means are provided for imparting additional up and down movements to the blade when sewing at a low speed and continuation of trimming when the machine is stopped, in order to turn the workpiece about the needle, which is required when changing the sewing direction.