Abstract: An air guiding arrangement for welding materials having plastic films includes a device to supply a uniform hot-air stream at any given air velocity. The air guiding arrangement has a nozzle which contains a swirl chamber functioning as a diffuser which tapers in the shape of a funnel. The nozzle is preceded by an adjustable air divider through which the amount of air to be supplied to the welding site is varied. The hot-air welding machine serves for a seam-shaped connection of plastic containing materials providing uniform heat distribution in the welding gap.

Abstract: A workpiece alignment device for sewing machines for aligning a workpiece fold edge, such as a shirt buttonhole strip. A ruler stop is provided positioned on a sewing machine work surface. An alignment finger is provided connected to a double action cylinder for movement of the finger between a first position and a second position as the flat alignment finger is guided by a guide plate having guide sections extending upwardly such that the flat alignment finger connected to a bow-shaped hook may be moved upwardly and away from the guide ruler and away from the workpiece and downwardly toward the workpiece and guide ruler to engage the folded section to move the folded section into alignment with the ruler stop.

Abstract: A sewing machine with an upper transport mechanism includes an arrangement with a pressing foot and a transport foot wherein the mass accelerations due to the movement of these members is reduced. A triangular lever member is provided with lever arms 34b, 34c which are linked with the presser foot and upper transport foot. The triangular lever member is linked so as to be angularly movable to an extent of the respective lever arms. Connecting rods of the presser foot and the upper transport foot are connected to the lever arms and are driven thereby. The movement of the connecting rods and the lever arms reduces the mass force of the respective transport foot and the presser foot. To further reduce the mass forces, the upper transport foot and the presser foot are spring loaded with respect to respective carrying elements of the upper transport foot and presser foot so that a damping action occurs.

Abstract: A device for welding plastic foil strips together with a heating device and a pair of pressure rolls between which the strips are fed, includes a pressure device supported by a spring mechanism for one of two pressure rolls. The pressure device includes a first regulating mechanism for the setting of the width of the gap between the two pressure rolls and a second regulating mechanism for the setting of the welding pressure which is arranged on the first regulating mechanism and which can be moved by it. The regulating units of the two regulating mechanisms are two interacting eccentric elements. This leads to a compact design and only little force is necessary for the setting of the welding pressure.

Abstract: In a procedure for feeding two limp workpiece sheets intended to be treated together and/or connected with each other and positioning them with respect to each other, it is provided to clamp them in a planar suspended position in clips of trolleys guided by rails. They are moved by the trolleys to scan their contours in a scanning station and to align them relative to each other in an alignment station. The alignment position of the workpiece sheets is fixed through a coupling device, which acts upon clip holders on the trolleys and can be moved together with them. This simultaneously connects the trolleys assigned to each other in pairs into a structure moving as a unit. The workpiece sheets are subsequently guided in their fixed alignment position to a treatment or processing station.

Abstract: A device for the identification of a code on a code carrier is composed of a light source, a code carrier with a plurality of light-permeable code-windows which provide polarization filters. The codification is manifested in different polarization and is composed of a receiving device with a ray splitting mirror for splitting light coming from the code carrier into two beam parts and also providing for each beam part one light sensitive detector. This device also has polarization filters interposed so that they face each other in crossed polarization direction.

Abstract: A sewing machine is provided with a mechanism which is actuated by a drive unit and engages with a needle point insert. The mechanism moves a needle plate insert from a sewing position raised above a needle plate, in which the needle plate reinforces a fabric being clamped to a fabric holder, to a resting position not raised above the needle plate, in which the fabric holder may be moved and the fabric may be changed. The mechanism insures that this movement can be effected in a straightforward manner and with only slight wear and abrasion and while affording accurate transmission. The mechanism is fashioned as a straight-line mechanism with a first oscillating crank which is adjusted for setting the operating height of the needle plate insert and a separator crank for adjusting the insert between a rest position and an operating position.

Abstract: A sewing machine is provided with a upper and a lower feed device with which a workpiece consisting of several plies can, when making arched and/or corner type seams, be transported in always constant position of orientation without mutual displacement of the plies. For this purpose the feed direction of both feed devices can be varied either by changing their direction of action or by geometric addition of at least two motion components.

Abstract: A sewing group is associated with a sewing machine and a feed device and comprises a work-holder drivable by two links supported on respective slides which are moved by separate stationary positioning motors which drive the respective slides. The maximum drive forces supplied in the two directions of movement of the feed device are as nearly equal as possible. Links are articulatedly connected with a work-holder for the transmission of exclusively axial forces. At the work-holder is pivoted one end of a guide arm structure whose other end is received for rotary movement in a longitudinal guide. Due to the equivalent load on the two links 13, 26 there result, for the positioning motors, equal drive conditions and equal maximum forces. The feed device is especially suitable for sewing groups with work-holders drivable by step motors.

Abstract: Apparatus and method of positioning and holding a thread chain for sewing onto successively fed workpieces, a thread chain which had been sewn beyond the rear edge of a workpiece and had been cut off flush with the rear edge of the workpiece, is sucked into the suction aperture of a suction tube. The suction tube is movable in a path parallel to the stitch plate of the sewing machine first in a catch position behind the needle and then the tube is moved into a delivery position before the needle aligned with a seam line (N). The chain is clamped there under a tensile stress in such a way that complete inclusion of the thread chain into the next following seam is possible. The suction tube extends parallel to the stitch plate and has a suction aperture into which the severed thread chain is sucked. The tube is moved to a delivery position in which the thread chain is pressed against an elastic abutment.

Abstract: A sewing machine having a thread monitor associated with a bobbin mounted for rotation. The bobbin includes first and second reflecting surfaces associated with an inner side of a second bobbin flange, and first and second light outlet openings associated with a second bobbin flange. A light source is provided for directing light toward the reflecting surfaces. A light receiver is positioned so as to receive light emerging from the first and second outlet opening. The light receiver produces signals representing the light intensity received by the light receiver. A Schmitt trigger provides a pulse to a microprocessor coinciding with a revolution of the bobbin. For each revolution of the bobbin, an A/D converter converts signals received from the light receiver into digital signals which are compared. The digital signal having the maximum value for the revolution is stored in a memory and then compared with a subsequent maximum value.

Abstract: A system for the stacking and storing of workpieces particularly from a sewing machine comprises a movable carrier with two receiving compartments for the workpieces to be stacked, two storage channels spaced from each other by the width of a receiving compartment, and two push units. The carrier is so controlled by a pneumatic cylinder that one of the receiving compartments stands in stack forming position below a work transfer device and the other is aligned with one of the storage channels.

Abstract: A welding machine for foil webs which are overlapped comprises an undercarriage which includes a rectangular frame having longitudinal frame members and laterally adjustable transverse frame members with wheels supporting the frame. A welding device is positioned on the frame and it in the frame includes centering elements which may be adjustable so as to position the welding device accurately in respect to the frame. The welding device itself advantageously includes slots extending inwardly from each side into which a respective foil end is positioned and roller means which engage with one of the foils for guiding it as the undercarriage is moved over the top of the respective foils to be welded together. The undercarriage during the welding device includes a drive from the wheels to the rollers which includes a shaft assembly having a plurality of universal joints.

Abstract: A method and an apparatus for sewing a waistband and applying it to a garment using a two-needle sewing machine and a blindstitch folding attachment for the waistband. A waistband is turned up to form the end of a waistband extension and is finished with a shaped seam in the region of the turnup edge. With the top sides lying one on the other, they are trimmed and then supplied by the blindstitch folding attachment to the needles spread out with the trimmed edge pointing in a feed direction. The lateral edges, turned up, are at first sewn onto the central part of the waistband while being transported backwardly. With the sewing machine stopped, a waistband beginning is clamped and extracted from a supply with the end of the waist extension moved from the folding attachment and cuffed in feed direction.

Abstract: A method of sewing the corners of a double seam, employing a two-needle machine the two needle rods of which each may be mutually independently engaged and disengaged. The method uses control means to arrive at the corner point of the inner seam, disengaging the internal needle rod, furthersewing to the corner point of the outer seam, stopping the sewing machine with the outer needle penetrating the workpiece, then rotating the workpiece, sewing the thus rotated outer seam, and engaging the inner needle rod.

Abstract: A method of interconnecting first and second material plies, each having one side coated with a thermoplastic material uses continuously rotatable pressing rollers and a heating gas. The marginal edge portion of an uncoated side of the first ply is folded back upon itself to form a pocket along its edge and after a strip having thermoplastic coating on each side is folded lengthwise, it is inserted into the pocket. The marginal edge portion of a thermoplastically coated face of the second ply is then positioned over the folded-over marginal edge portion of the first ply. Thermoplastic material between the folded-over portion of the first ply and the marginal portion of the second ply and between the folded portions of the strip are then heated so that they become plastic and they are pressed together to press the portions to be bonded together.

Abstract: A sewing machine with adjustable upper and lower feed dogs is for sewing together sections of clothing in which ungathered segments of seams alternate with seam segments with differing degrees of gather. The spring-held presser foot is coordinated with a pneumatic cylinder as an additional mechanism of increasing contact pressure during the sewing of ungathered segments of seams. The cylinder is operable by a control cam connected to an adjusting mechanism for a stitch guide of one of the feed dogs. When sewing gathered segments, the pressure of the presser foot is greatly reduced, whereas the pressure is increased during the sewing of gathered seam segments and through a "fastening" step at the end of the seam.

Abstract: A sewing machine which is used with manual feed movement of a sewing material has a holding device for the material that is effective during the first phases of stitching of a seam section, by which the first thread knot is held from becoming undone when short thread ends and a large feed movement are used. In a first embodiment, the holding device includes a holding foot, by a drive mechanism in addition to a presser foot which is periodically moved up and down by a drive mechanism, and a controllable drive for the holding foot. In a second embodiment, the holding device includes a presser foot, a compression spring and a decoupling mechanism by which the presser foot can be disconnected from its drive mechanism.

Abstract: A lubricating device for a revolving lock stitch shuttle of machines such as sewing and embroidering machines comprises a shuttle body which has a hub portion which surrounds its associated shuttle arbor and which lies adjacent a bearing mounting for the arbor. The hub portion is hollow and defines a lubricating oil chamber between it and the associated bearing and a gap between the shuttle hub portion and the associated bearing is bridged by a fixed ring member which is carried on a bracket which is secured to the bearing. The ring member has an opening therethrough providing an access for a nozzle tube for feeding oil from an external reservoir to the hub recess from when the oil is advanced by the centrifugal force of the rotation of the shuttle to the periphery of the shuttle.

Abstract: A sewing arrangement is provided with a feed device which comprises a drive device, a pitman drive, and a work holder received by a support. The feed device, designed so as to be subject to little wear, permits the execution of purely translatory movements with great accuracy, in that the pitman drive has associated with it a parallel guiding means which together with the pitman drive is articulated to the support of the work holder.