Abstract: An automatic sewing machine having a folding device and a feeding device is designed in such a manner that the folding device is designed to be displaceable and lockable on a stand of the automatic sewing machine in a feeding direction relative to the sewing head. The purpose of these measures is to achieve a minimization of the cycle times. In adapting to the size of the workpieces to be sewn together, the position of the folding device relative to the sewing head can thus be reduced to a minimum.

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: 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: An automatic sewing machine for producing a seam having a fastening seam and a tacking seam is installed with a sewing head having a bearing bracket with two bearings which are arranged at a distance from each other for receiving a reciprocating needle bar including a needle. A sewing head comprises a drive mechanism to selectably impart jogging movements to the needle bar, wherein the movements form a transmitting ratio with respect to the reciprocating movement of the needle of 1:1 or 1:2.In order to render possible a shifting of the needle jogging movement during the operation of the machine and under full load, the two bearings guidingly receiving the reciprocating needle bar are oscillatingly drivable independently of each other wherein one bearing is oscillatable at a transmitting ratio of 1:2 and the other bearing is oscillatable at a transmitting ratio of 1:1. Both bearings are drivingly connected to individual drive parts each of which is independently engageable.

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 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 machine for sewing together two workpiece parts having edges of equal or unequal length by using a bead seam, especially for joining together the edge of a vamp and the shorter edge of a plug of a true moccasin shoe, so that the length of the plug matches that of the longer edge of the vamp, in only one operation. The bead seam forming device essentially consists of an auxiliary folding and ruffling finger acting in front of the needle of the sewing machine and in synchronous driving connection with the needle; several machines are described which are provided with different bead seam forming devices.

Abstract: A machine for sewing together two workpiece parts having edges of equal or unequal length by using a bead seam, especially for joining together the edge of a vamp and the shorter edge of a plug of a true moccasin shoe, so that the length of the plug matches that of the longer edge of the vamp, in only one operation. The bead seam forming device essentially consists of an auxiliary folding and ruffling finger acting in front of the needle of the sewing machine and in synchronous driving connection with the needle; several machines are described which are provided with different bead seam forming devices.

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: A machine for sewing together two workpiece parts having edges of equal or unequal length by using a bead seam, especially for joining together the edge of a vamp and the shorter edge of a plug of a true moccasin shoe, so that the length of the plug matches that of the longer edge of the vamp, in only one operation. The bead seam forming device essentially consists of a folding finger acting in front of the needle of the sewing machine and in synchronous driving connection with the needle; several machines are described which are provided with different bead seam forming devices.

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.

Abstract: A device for producing piped openings in flat base material, for instance welted pockets, comprising first workpiece clamping means for securing a workpiece to a workplate, piping patch holding and folding means, sewing machines for sewing said folded piping patch on said workpiece with two stitch rows cutting means for cutting a slit and V-shaped tab slits at the ends of said slit, and a second workpiece clamping means which is displacable into said first workpiece clamping means and said piping patch holding and folding means, to receive said flat base material together with said folded piping patch and to feed them through said sewing machines and said cutting means.