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: Method and device for safe operation of an automatic sewing machine having a programmable computer controlling a seam contour, at which a contoured workpiece clamp is automatically identified and compared with the sewing contour prior to the start of the sewing operation. The method also may include a further subroutine for automatically positioning the controlled seam contour with respect to the workpiece clamp so as to eliminate an accumulation of errors resulting in damaging of the automatic sewing machine. According to this invention a sewing head is provided with a sensor, which is moved along a distance limited by a firm reference point and a trigger point arranged at the workpiece clamp, where the detected distance corresponds to the profile of the workpiece clamp.

Abstract: A computer-controlled automatic sewing machine has a sewing head and a workpiece holder. In order to be able to alternately sew at least two workpieces, the sewing head is movable in X and Y-directions by means of servomotors, while the workpiece holder having at least two workpiece clamps is fixed.

Abstract: An arrangement increasing the rate of production and operating reliability of a method for identifying the type and/or size of a work receiving unit applied to an automatic sewing device. The identifying procedure is carried out prior to the sewing operation. According to the invention a sensor is associated with the sewing head or with the lower arm and provides a signal when coinciding with a mark at the work receiving unit. The sensor is first moved along a straight line in X-direction and then along a straight line in Y-direction. The straight lines each include a mark, one of which represents type of the work receiving unit and the other one the size of the same.

Abstract: A workholder for a sewing machine for producing a stitch row in a workpiece according to a predetermined contour. The movably arranged workholder has a cutout essentially formed according to the stitch contour and is controlled with respect to the needle by means of a feeding device incorporating a linkage system and a control disc. In particular, a new frame-type workholder with an additional workpiece clamp is provided for rendering possible the production of a decorative stitch row in connection with a label fastening stitch row.

Abstract: An automatic sewing machine is provided with a workpiece feeding device for imparting a continuous motion to the workpiece during the sewing cycle and with a sewing head having a needle bar which is oscillatorily driven by an arm shaft via a crank gear. In order to reduce the needle deflection due to the continuous workpiece feed motion in a simple way, in addition to the crank gear for driving the needle bar, there is interposed a double crank gear between the arm shaft and the crank gear which reduces the angle of rotation while the needle penetrates the workpiece.

Abstract: A feeding device for an automatic sewing arrangement for producing a seam of a predetermined contour, in which a link system is provided with two levers and an output lever. To the free end of the output lever there is tiltably mounted a workpiece clamp. The two levers are pivotably supported about a stationary axis in order to be swingably driven. In order to allow universal displacement of the workpiece clamp, the displacement of which is only restricted by the size of the link system, driving devices engage independently from one another the levers. Furthermore, the workpiece clamp may be swingably driven by an electric motor.

Abstract: A control device for a differential feed system of a sewing machine in which a control box is connected to a control motor regulating the relation of the feed rates imparted to feed elements engaging a workpiece. The control motor is formed as a pneumatic cylinder composed of individual single acting cylinders arranged in a carrier tube is series, and is operably connected to the differential feed system including two independently adjustable feed mechanisms each regulated by such a pneumatic cylinder. Different feeding conditions for the workpiece, such as feeding the workpiece in a compressed, stretched or neutral relation at various stitch lengths, may be selected by the operator at the control box.

Abstract: A feeding device for an automatic sewing arrangement producing a stitch row according to a predetermined contour in a workpiece is installed with a linkage system having a control disc. The linkage system is provided with a workpiece clamping plate movably arranged in a plane and operably connected to the control disc. Furthermore, the workpiece clamping plate is movably received on a drive-off-lever of the linkage system. A linear drive with control elements is provided for displacing the workpiece clamping plate and locking the latter in at least two positions. Control means for at least interrupting the sewing operation during the displacement of the workpiece clamping plate are provided at the linkage system.

Abstract: A sewing device for producing fastening stitches and tack stitches in a workpiece is described, in which a sewing head is installed with a jogging mechanism laterally vibrating the reciprocating needle as to perform a zig-zag movement or a needle-feed movement while a continuous relative feed movement between the workpiece and the needle is produced by a control device. The control device includes means for maintaining the direction of the needle vibration and the feed movement, as the fastening stitches are produced.

Abstract: An automatic sewing machine for sewing workpieces of different sizes is described, in which relative movement between a workpiece and the needle of a sewing head is controlled by a computer receiving the program according to the contour to be stitched. A measuring device is provided for automatically matching the relative movement of the sewing process with the size adjustable workpiece receiving elements. The measuring device continuously detects the size adjustment of the workpiece receiving elements and feeds the size adjustment into an adapting electronic unit converting analog information into digital information used by the computer controlling the stitching operation.

Abstract: An apparatus for use in producing men's shirts or blouses provided with attached collars, which have a bottom fabric layer with a joining edge and a top fabric layer. The apparatus is provided with a marking device for indicating the collars at several points before sewing on the shirts or blouses and with a cutting device for trimming the joining edge of the bottom fabric layer of a collar after indicating. The marking device is provided with means for adjusting to variable collar sizes and changing over to different collar contours and the cutting device containing means for feeding the collars during trimming and for guiding the collars along the cutting means arranged side by side on a base plate. By this it is possible to perform two working operations by only one operator.

Abstract: A device for infolding margins of a binding strip, folding the strip about a longitudinally directed main fold line, sewing the folded binding strip to one edge of a slit of a shirt sleeve or a tubular garment, e.g., skirts, blouses, fronts of pullover shirts, and securing the area where the two edges of the slit meet, by means of a seam. The device carries out the working steps in only one uninterrupted sequence of operation. The device can be provided with additional means for preparing a second binding strip and a second sleeve while sewing the two preceding workpiece parts.

Abstract: An adjustable template for use in a sewing device for sewing workpieces of different shapes. The template has a supporting plate and a plurality of segments each having wedge-shaped lateral edges, a bearing surface for a template follower means and a slot-shaped clearance formed in the bearing surface, for receiving and slidably fastening a flexible connection wire. As a result of connecting all segments at their bearing surfaces, only several of the plurality of segments are secured to the supporting plate. Consequently, an alignment of the bearing surfaces of the segments according to a required course of a seam, is simplified.

Abstract: A guide template for sewing machines in which a driven roller follows along the template's contour to sew workpieces of different form and/or size. The template has a number of sections which are movable relative to one another. For purposes of lengthening one of these template sections, a second movable and adjustable template section is provided in combination with a third template section which is pivotably mounted on the second template section. The third template section may be adjusted to different contours by an adjustment device. This adjustment device has a cam plate interacting with the third template section, and mounted rotatably on the machine frame through the use of a handwheel. The second template section is located between the first and third template sections, and is used to extend the template. The second template section is held by a gear rack on a plate on the machine frame, and the gear rack engages a pinion which is rotatable with an adjustment knob for shifting on the gear rack.

Abstract: A workpiece holder for sewing machines in which a plurality of supporting segments are located next to one another and are displaceable relative to each other. These supporting segments have a rim zone at which needles are located. The rim zone, furthermore, supports the edge of a workpiece to be processed. A device which may be lowered onto the workpiece, cooperates with the needles for holding the workpiece on the needle. A contour adjusting device is provided with templates for shifting the supporting segments. The templates have a contour corresponding to the seam to be applied to the workpiece. The supporting segments are, moreover, formed by rails having a U-shaped cross-section with cross bars carrying the workpiece and having recesses for permitting passage of the needles. The latter are arranged on a two-arm lever rotatably supported in each of the supporting segments, and they are held in a position permitting passage through the supporting segments within the recess by means of a spring.

Abstract: A template control for relative movement between a workpiece or material and a tool which may be in the form of a needle on processing machines. The template is adjustable to different shape and/or size of a workpiece which may be in the form of a garment. A roller is pressed against the template which is provided with a coaxially located and driven gear pinion. The pinion meshes with teeth adaptable to the shape of the template for purposes of guiding the roller without slippage along the template. The latter has an elastic tape which determines the shape of the contour. The tape is held in a number of tape carriers arranged displaceably next to one another and parallel to one another. Displaceable tooth segments under tension of a spring, are associated with the tape carriers. These tooth segments when located next to one another, form a gear rack with identical toothing.

Abstract: A sewing device for sewing similar workpieces of alternate sizes, the device is provided with means for the positioning control and the insertion of the workpiece cuts to be sewn, into the workpiece clamping holders. To adapt the device for workpieces of other sizes, there are provided adjusting means for the simultaneous displacement of two-piece clamping holders, master cams and the stop dogs of an inserting device.