Durkoppwerke Gmbh

Durkopp Adler Aktiengesellschaft

Heinz Goldbeck

Horst Plassmeier

Herbert Struck

Klaus Moller

Herbert Diekmann

Dietrich Kahler

Werner Meyer

Helmut Gogolin

Torsten Bochert

Eckhard Schalk

Helmut Frodermann

Thorsten Vogt

An apparatus for the transfer of a piping strip from a preparation station on to a workpiece comprises a preparation table and a gripping mechanism to be lowered thereon. In the preparation table, provision is made for a cutting device with a knife carrier having several knives which, by a single knife-driving mechanism, can be elevated from a position lowered underneath the supporting surface of the preparation table and while making cuts, can be guided through the piping strip.

Apparatus for the transfer of a piping strip from a preparation station

A device for cutting and turning a piped opening in a cloth workpiece which includes a main piece of cloth and a cloth strip sewed to it. The workpiece has a slit, and corner cuts are formed at the slit ends by corner knives with the workpiece lying on a support plate. Turning tools are introduced into the slit at positions located spaced from the corner cuts. The turning tools are then moved apart toward positions located closer to the corner cuts and thereupon lowered, so as to turn the piped opening. Inserting devices may be provided for initially pushing at least part of the workpiece into the slit before being engaged by the turning tools. An orienting device furthermore may orient the workpiece at an acute angle or perpendicular to the support plate for being engaged by the turning tools.

Apparatus for cutting and turning piped openings in cloth workpieces

A folding stamp for folding sewing parts which are to be attached to a main sewing part, in a sewing system for making pockets in articles of clothing. The additional sewing parts, such as flaps or pocket-bag blanks, can be fed manually. This folding stamp has a fastening unit arranged on an upwardly and rearwardly extending extension formed on a vertical web. The fastening unit thereby extends above a resting surface on top of the web and in the direction toward the rear end of the folding stamp. The folding stamp is thereby arcuate or C-shaped in longitudinal cross-section, which gives it a compact construction and gives the operator an unimpeded view of the region in which he must feed the additional sewing parts.

Folding stamp for a sewing machine

A method and sewing apparatus including a twin-needle sewing machine (3) for making a pocket insert having a flap. The workpiece (47) is placed in a preparation station (50) and gripped by clamping plates (41, 42), then transported into a sewing position (51), and thereafter into a cutting position (52). Before the seams are made, measurement variables which provide information with respect to the angles formed by the flap-limiting edges are fed to a control (23). As a function of the measurement variables, a control (23) automatically sets the angles of the corner knives (69, 70) provided at the cutting position (51).

Method and sewing system for the production of a pocket insert

A method and apparatus for automatically making a pocket opening having a flap and a pocket bag, one half of the pocket-bag blank being sewn to the workpiece together with the flap and the piping strip. The formation of the seam takes place as a function of the detected presence of the flap. During the transport of the workpiece, flap, and blank to the sewing place, the part of the pocket-bag blank which rests on the flap is lifted off of the flap, the presence of the flap is detected by an opto-electronic sensor, and the pocket bag is again placed on the flap before the parts are sewn together. The sewing machine is controlled in response to the sensor so that the seam corresponds precisely to the length of the flap. The pocket-bag blank is lifted off and replaced on the flap by a folder which has an arrangement of guide plates for carrying out the invention.

Method and device for producing pocket openings

A sewing machine, having a device for centrally cutting a piping strip at both of its ends. At least one knife is arranged in a piping strip gripper between the parallel rows of oblique gripping needles. Before the start of the sewing process, a piping strip which has been placed at a predetermined position on a resting plate is held clamped between said plate and the gripper, which is lowered onto the resting plate. By actuation of the knife by an external force such as a pressure fluid, a blade of the knife penetrates into the piping strip and, by horizontal displacement of the knife, the piping strip is incised centrally at its end. Preferably there is a blade for each end of the piping strip.

Sewing machine with piping strip cutting and transfer device

By means of this method and apparatus for sewing a seam, it is possible to end a seam exactly at a predetermined location. When the predetermined location is reached, the forward movement of the sewing material is interrupted, and only the stitch that had been begun at the time of the interruption is completed. In this way, on the one hand, visually attractive seams can be produced and, on the other hand, it is possible to sew a small part onto a main part with a seam which does not extend past the small part.

Method and apparatus for sewing a seam ending at a predetermined location

A method and sewing unit for folding a strip of cloth and then transporting it to a sewing machine together with a sewing material blank to which it is to be sewn. In accordance with this invention, the sewing material blank 109, which has been laid out in accordance with markings at a layout point 101 of the sewing unit, together with the strip of cloth 110, are transferred by a feed device 8 to a transfer point 106 beneath the sewing-material holder 9, which has previously been raised. A pivotable and displaceable folding-plate 94 provided on the sewing-material holder, together with a counterplate 54 of the feed device 8, carries out the folding of the strip of cloth 110. Then the folding-plate 94 is pulled forward and the counterplate 54 backward, and the feed device 8 is placed in its raised position. The sewing-material holder 9 moves the folded strip of cloth 110 and the blank 109 lying under it to the sewing point 108 at the sewing machine 3. The feed device 8 is now on its way back to its starting position in the region of the layout place 101.

Method and sewing unit having means for folding a strip of material

A small part (42) is automatically lowered, with its front side (76) facing upward, directly onto a main part (43) which is spread out on a worktable (2), the front side (76) of said main part also facing upward. The respective patterns of the main part (43) and the small part (42) are aligned. Then the small part (42) is automatically turned over, whereby it then can be deposited, with its front side (76) facing downward, on a sewing-material clamp (8). The latter transports both the main and small sewing parts, fixed in position, first to the sewing station (68) and then to the cutting station (6).

Method and device for attaching a pocket insert

A sewing device for producing piped openings such as pocket slashes, with or without a pocket flap. The sewing device includes a two-needle sewing machine having a vertically moveable center knife for cutting an opening to be piped, a cutting device including two vertically moveable angle cutting knives for performing gusset cuts, and a material transport device for receiving material to be sewn and transporting such material between the sewing machine and the cutting device. Also provided is a control system including a microprocessor for adjusting the operating positions of the various components to move the points of commencement of the parallel seams, the center knife, and the angle cutting knives, individually or jointly, forward or backward, to conveniently and selectively change these sewing parameters in response to the specific workpiece. In one embodiment, a common drive motor is provided for the two-needle sewing machine, the transport device, and the cutting device. Alternatively, the mechanism is substantially simplified in a sewing device wherein the two-needle sewing machine is driven by a first electric motor, and the transport device and the cutting device are driven by at least one additional electric motor.

Sewing device for producing piped openings in sewing material

In a sewing machine, particularly one useful for producing piped pockets, wherein the pieces to be sewn to a workpiece include a slide fastener or zipper, a transfer device for transferring the slide fastener containing sewn pieces to the workpiece is provided. The transfer device includes a grip-fold stamp which is vertically movable toward the piece to be sewn which is held over a plate by vacuum, with the slide fastener held in a pocket of the plate. The grip-fold stamp is moved down to the plate and holds the area of the sewn piece adjacent to the slide fastener. A clamping strap on the grip-fold stamp is movable by an appropriate servoelement, either electromagnetic or air pressure cylinder, into the pocket in the plate and beneath the slide fastener for holding the sewn piece at the slide fastener at the underside of the grip-fold stamp. The clamping strap may be an arcuate piece that is shifted around the circular front of the grip-hold stamp to its clamping position or it may be a pivotally supported part which pivots to its clamping and releasing position. The clamping strap moves toward and with respect to a guide fixed to the underside for the grip-fold stamp.

Sewn part transfer device for a sewing machine

A pocket opening sewing machine including a cutting device for producing two notching cuts at the ends of a pocket opening. The sewing machine has sewing needles and a belt driven clamping device for clamping to the sewn parts for advancing them in an advancing direction. The cutting device includes two knives spaced apart. The knife that is further from the sewing needles is movable toward the stationary knife that is closer to the needles. For adjusting the spacing between the knives, the movable knife is temporarily clamped to a moving belt which moves it toward the stationary knife. An adjustably positionable stop defines the furthest limit of spacing between the stationary and movable knives and a spring drives the movable knife against the stop. The clamping of the movable knife to the belt is initiated by a sensor which senses the passage of a sewn part and which operates a microcomputer with pocket length information stored in it to move the movable knife when required over the distance required. Alternately, if the movable knife moves at a speed faster than the advancing speed of the sewn parts, adjustment of the movable knife stop can be dispensed with.

Automatic pocket opening sewing machine having a cutting device for

A sewing machine with a presettable counter for sewing a predetermined number of stitches to the end of a stitch seam. According to the invention the counter is provided with a correction unit responsive to at least two sectors of a rotary machine member, each revolution of which corresponds to the sewing of a stitch of normal length. A sensor is responsive to the different sectors and, upon detection of one of these sectors, produces a signal which an evaluating unit can pass to a count resetting unit to set back the stitch counter by one stitch unit. As a consequence, the overrun or underrun of the stitch seam is at most one half of the normal length of a stitch.

Sewing machine with a stitch counter and correction unit

A sewing machine and method of operating same in which the vertically reciprocatable needle bar is mounted in a guide capable of swinging movement back and forth and the guide, in addition, is shiftable by a separate drive upon withdrawal of the needle from the fabric to form locking or anchoring stitching at the end of a stitched seam.

Sewing machine

An assembly at a sewing machine for forming a piped-edge or bound pocket opening in a garment workpiece includes a pair of sewing needles for stitching two parallel seams in the workpiece and in a reinforcing strip laid thereon, a blade for cutting a slit in the fabric pieces between the two seams and a pair of cross-sectionally angular cutters removably clamped to the plunger of a pneumatic actuating cylinder and having vertices engaging opposite sides of a mandrel also mounted on the plunger. Upon charging of the cylinder, the mandrel passes through an end of the slit to widen same and consequently enable the traversing of the slit by one or the other of the angular cutters, whereby one cutter is effective to form a V-shaped incision in the fabric pieces at the slit end and the other cutter is ineffective.

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Bielefeld, Germany

Heinz Goldbeck