Abstract: A needle guide integrated in a thread cutter of a sewing machine installed with a hook operating about a horizontal axis and a feeding mechanism generating a relative movement as a feed motion between a workpiece and stitch former. The needle guiding element is incorporated with the thread catcher receiving member and alternately moved into operation by the thread cutter actuator. Adjustors are provided to position the needle guide with respect to the needle.

Abstract: In an automatic sewing device for sewing together tubular workpieces such as sleeves, and pocket-shaped workpieces, such as cuffs, there are provided an inner clamp, a central clamp and an outer clamp. These clamps are associated with an inner sleeve clamp and an outer sleeve clamp, the latter being associated with a folding device for gathering up a material fullness of the tubular workpiece. Devices are also provided for opening the pocket-shaped workpiece in order that the border of the tubular workpiece may be inserted and positioned. The associated sewing machine can be moved in a straight line relative to the parts described. A part of the border of the tubular workpiece is positioned in the pocket-shaped workpiece and sewn to the latter by means of a straight-line seam. Subsequently, the clamping in this area is released and the positioning of the border of the tubular workpiece in the pocket-shaped workpiece is carried out and clamping is effected.

Abstract: An automatic sewing machine for successively sewing workpieces, which, in particular, are flexibly connected to one another by at least one thread chain, is provided with a reel subsequently arranged to a sewing head for receiving sewn workpieces on its substantially cylindrical core. In order to render possible a trouble-free feeding, initial catching and winding of the workpieces, a lower winder support is positioned in front of the reel for feeding and guiding the workpieces to the core of the reel. Moreover, there may be provided an upper winder support which is lowerable towards the core and which at least partially encases the latter at a side opposite the lower winder support.

Abstract: In order to overcome especially large areas of obstacle between a carrier plate for a workpiece to be sewn and a tubular stud arranged at the underarm of a sewing head, the underarm is tiltably arranged as to be swung downwards from its working position. The axle about which the tilting of the underarm is carried out, is located in the area of the standard of the sewing head. Additionally the upper arm of the sewing head can be tilted upwards about the same axle. Separate individual tilt drives are provided for the underarm and the upper arm.

Abstract: A thread-chain separating head, in particular for a double chainstitch sewing machine, comprising a heating wire for thermically separating the thread chain and comprising a suction tube for leading the thread chain towards the heating wire. Said heating wire is arranged laterally and outside of the suction tube in order to achieve advantageous conditions during the heating and separating operation.

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 device at a sewing machine for applying a tensile stress in a material to be fed for sewing, particularly a thread, a ribbon etc. Several pneumatic cylinders are arranged in parallel for generating a variable force acting upon at least one friction element. Several pneumatic cylinders are combined into groups, which are selectively controllable by compressed air valves and a selector switch. Due to the special construction of the pneumatic cylinders, there is obtained a cost-saving tensioning device for generating a tensile stress in a material.

Abstract: A method for drawing the free end of the needle thread from the upper workpiece surface to the lower workpiece surface when sewing the first stitch of a seam to be produced by a sewing machine having a reciprocable needle, which carries the needle thread drawn from a spool by means of a thread lever, at least one presser foot lowerable upon and liftable from the workpiece, and a rotatingly drivable hook, the point of which seizes and withdraws the needle thread for the stitch formation. In order to safely and automatically prevent the thread end of the needle thread from being clamped between the presser foot and the workpiece, the needle thread is held between the needle and the thread take-up lever while the needle thread loop is withdrawn by the hook beak, so that the thread end is drawn through the workpiece by the hook beak.

Abstract: A device for controlling the looper thread of a double chainstitch sewing machine has a looper which can be oscillatingly driven in the sewing direction. A link mechanism is provided to drive the spreader, said link mechanism being designed as a six-bar linkage mechanism with a four-bar linkage and a secondary two-link group. The basic linkage and the two-link group are arranged in such a manner that two links are guided during a movement of the spreader in an extreme position in which it does not spread the looper thread. Thus a spreader movement is produced which is particularly adapted to the sewing process.

Abstract: A double chain stitch sewing machine having a feeding device with a feed dog oscillatingly movable in and opposite to the feeding direction for producing a relative movement between a workpiece and the sewing machine. It has a needle reciprocatingly driven by a crank mechanism, at which the feeding mechanism also imparts synchronous jogging movements to the needle in order to generate a needle feed movement. The reciprocatingly and joggingly driven needle cooperates with a looper oscillatingly driven by a looper drive mechanism in parallel with the feeding direction. The looper drive mechanism is formed as a six-bar-linkage-mechanism provided at the input with a stationary pivot and at the output with a stationary pivot and provided with an intermediate pivot.

Abstract: A workpiece holder for sewing the tip areas of neckties comprises a lower plate and a central folding device between which a lining cut and a necktie material cut are arranged. The center folding device has folding plates which can be displaced transversely with respect to the longitudinal direction and which, when moving together, draw in the material fullness in the necktie cut and gather it in a central fold. Lateral seams are sewn after the sewing of outer seams in the tip area of the cuts.

Abstract: The present invention provides an upper feeding device of a sewing machine comprising a feeding presser foot and a holding presser foot alternatingly cooperating with it, to which is imparted by means of an oscillating means and a angle lever coupled thereto, an up and down motion extending perpendicular to a throat plate of the sewing machine. To provide an optimal drive of the presser feet, the oscillating means is formed by a cam means coacting with a jogging mechanism coupled to the angle lever. The jogging mechanism is provided with a translatorily movable slider extending vertically to the direction of movement of the presser feet. The slider is drivable at an interchangeable lever ratio by a shaft via a slide block-guide.

Abstract: A sewing device having a sewing head including a rotary housing and a control device for controlling the rotary movement of the housing and for generating a two-axis-relative movement between the workpiece to be sewn and the rotary housing. The latter is tiltable about the needle axis and pivoted by means of a hollow shaft. Within the rotary housing there are arranged a needle bar with a needle reciprocatingly driven by a crank, a thread take-up lever for handling a needle thread and drive means for operably moving up and downwardly a presser foot and occasionally a thread tensioner. In order to supply the required drive means inside of the rotary housing with energy without obstruction of the rotatability of the rotary housing there is provided a rotary coupling concentrically arranged with respect to the hollow shaft, at which the rotary coupling is also formed with an coaxial bore for the needle thread.

Abstract: A workpiece receiving device for a sewing machine, in particular for an automatic sewing device, is provided with workpiece receiving elements for clampingly receiving a workpiece at one side of a seam to be produced in the marginal area of the workpiece, the workpiece, namely a shirt collar, being provided at least with one tip. In order to also safely clamp the tip area of the workpiece for producing exact corner stitches without distortion of the workpiece, the workpiece receiving device is provided with an auxiliary workpiece clamp for clamping the workpiece tip, the auxiliary workpiece clamp being movable from an inoperative position into an operative position.

Abstract: A thread cutting device for a double lockstitch sewing machine is provided with a rotatably driven hook including a hook beak for seizing a needle thread loop. In order to assure a safe pickup, the thread catcher performs an operating movement in a tilt direction oppositely directed with respect to the direction of rotation of the hook. Furthermore, the thread catcher is operable if the hook point has passed the stitch hole for a range of about 90.degree. considered in the direction of rotation of the hook.

Abstract: In a sewing machine, particularly an industrial sewing machine, with a needle which can be driven up and down by means of a needle bar, a feed dog for the forward transfer of the workpiece in co-ordination with the needle movement, an actual feed rate sensing device which supplies a corresponding electric signal and at least one sensor for detecting a workpiece edge, for the purpose of increasing the accuracy of the positioning of the corner stitch of a seam portion with acceptable constructional expenditure, a device is provided for displacing the longitudinal axis of the needle parallel to the sewing direction as a function of the actual feed rate sensing device on the one hand and the detection of a workpiece edge by the sensor on the other.

Abstract: An automatic sewing machine installed with a sewing head and a feeding device is disclosed for successively sewing workpieces which are flexibly connnected to one another by a thread chain. The feeding device is arranged with a workpiece holder for receiving the workpiece and guiding the latter according to the extension of a seam situated in the workpiece.In order to simplify automatic sewing processes in front of the sewing head, there is arranged a reel carrying workpieces still to be provided with the seam. Behind the sewing head there is arranged a reel for receiving the sewn workpieces. The reel installed in front of the sewing head is stationarily arranged in a position relative to the workpiece holder. Between the sewing head and the reel arranged behind the sewing head there is installed a further feeding device.

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.

Abstract: A workpiece clamp of sewing devices for sewing the marginal zones of a lining cut and a necktie cut in the area of the tip and the lateral corners of a necktie. The clamp is equipped with three clamping plates hingedly connected to each other, for clampably receiving the lining cut and the necktie cut between the clamping plates. The intermediate clamping plate is provided, at the surface directed to the necktie cut, with central folding web and lateral webs for forming a center fold and lateral folds. The upper clamping plate is provided with folding blades for folding and holding down the lateral folds in coaction with the clamping plates for clamping the workpieces to be stitched together.

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.