Clamp Feeding Patents (Class 112/70)
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Patent number: 7878132Abstract: The sewing machine includes a presser body, a presser frame, a button holding device including a fixed portion and a sliding portion, a position detecting device including a sliding base attached to the presser frame and a sliding member coupled to the presser body and slidable with respect to the sliding base, a button diameter detecting switch, and a control device. The control device obtains, from the position detecting device, a shift amount of the presser body from a sewing start position when the button diameter detecting switch detects that a sewing operation is carried by a length that corresponds to a diameter of a button, and controls a drive of a sewing needle and the feeding of the workpiece such that a buttonhole stitch corresponding to the diameter of the button is formed.Type: GrantFiled: July 3, 2007Date of Patent: February 1, 2011Assignee: Juki CorporationInventors: Yutaka Asaba, Yasunori Ishii, Sen Mizuhara
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Patent number: 6951177Abstract: A buttonhole sewing machine comprises a top arm (1) with a needle (6) movable in up and down reciprocation and a base plate (2). A buttonhole cutting device (13) is provided, having a knife (36) which is disposed on the base plate (2) and comprises a straight cutting edge (37) that extends in the y direction and an eye cutting edge (38). A cutting block (15) cooperates with the knife (36). The knife (36) and the cutting block (15) are motor-adjustable one in relation to the other in the y direction.Type: GrantFiled: December 19, 2003Date of Patent: October 4, 2005Assignee: Dürkopp Adler AktiengesellschaftInventors: Jochen Fischer, Thomas Nöltge
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Patent number: 6772703Abstract: An eye-type buttonhole sewing machine comprises an x-y table with an x carriage which is guided on the sewing machine and on which a y carriage is displaceably guided, having a bearing plate. Actuation of the x carriage is effected by an x motor which is mounted on the sewing machine and directly coupled with the x carriage via a cam drive. Actuation of the y carriage is equally effected via an electric motor which is directly connected to the y carriage via a threaded spindle with a spindle nut and a sliding coupling.Type: GrantFiled: July 14, 2003Date of Patent: August 10, 2004Assignee: Dürkopp Adler AktiengesellschaftInventors: Karsten Filges, Horst Bohl, Samuel Römich, Rainer Panhorst
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Patent number: 6755139Abstract: A buttonhole sewing machine for producing buttonhole seams with seam end sections of various shapes in a work piece comprises an input equipment for feeding buttonhole parameters; and a computer for calculating, from the buttonhole parameters, sewing data that determine the respective buttonhole geometry. It further comprises a memory for storing the computed sewing data and a key to be shifted into two key statuses, by means of which to trigger conversion of a buttonhole seam from a position to the left to a position to the right or vice versa, and storage thereof.Type: GrantFiled: August 21, 2003Date of Patent: June 29, 2004Assignee: Dürkopp Adler AktiengesellschaftInventors: Frank Pannwitz, Rüdiger Mörbt, Werner Maasjost, Thomas Nöltge
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Patent number: 6722299Abstract: A CNC controlled buttonhole sewing machine comprises work piece clamps with sliding drives for displacement from an initial position of spread, by a length of spread, into a final position of spread. The sliding drive is an electric positioning motor that is allocated to a work piece clamp. Further provision is made for a control unit with data storage, in which to store data, for displacement of the work piece clamp by a given length of spread.Type: GrantFiled: December 5, 2002Date of Patent: April 20, 2004Assignee: Dürkopp Adler AktiengesellschaftInventors: Thomas Nöltge, Heinz Fransing, Andreas Oberndörfer, Theodor Janocha
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Patent number: 6694901Abstract: A buttonhole sewing machine comprises a buttonhole cutting device which includes a knife and a cutting block unit with several cutting blocks, one of which at a time being movable into a position of cooperation with the knife. The cutting blocks are mounted on an anvil that is stationarily joined to the sewing machine. The knife is movable from above against the anvil.Type: GrantFiled: May 28, 2003Date of Patent: February 24, 2004Assignee: Dürkopp Adler AktiengesellschaftInventors: Karsten Filges, Theodor Janocha, Jochen Fischer
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Publication number: 20040011263Abstract: An eye-type buttonhole sewing machine comprises an x-y table with an x carriage which is guided on the sewing machine and on which a y carriage is displaceably guided, having a bearing plate. Actuation of the x carriage is effected by an x motor which is mounted on the sewing machine and directly coupled with the x carriage via a cam drive. Actuation of the y carriage is equally effected via an electric motor which is directly connected to the y carriage via a threaded spindle with a spindle nut and a sliding coupling.Type: ApplicationFiled: July 14, 2003Publication date: January 22, 2004Inventors: Karsten Filges, Horst Bohl, Samuel Romich, Rainer Panhorst
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Publication number: 20030192462Abstract: A buttonhole sewing machine comprises work piece clamps with a pneumatically actuated displacement drive for displacement relative to each other of the work piece clamps from an initial position of spread by a length of spread into a final position of spread. Only the first work piece clamp is displaceable relative to the x-y table. The displacement of the first work piece clamp is defined between two stop positions. A control unit stores data for triggering an x drive for reversed displacement of the x-y table by half the given length of spread.Type: ApplicationFiled: April 9, 2003Publication date: October 16, 2003Inventors: Thomas Noltge, Jochen Fischer
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Publication number: 20030192463Abstract: A buttonhole sewing machine comprises work piece clamps with displacement drives for displacement from an initial position of spread by a length of spread into a final position of spread. The work piece clamp comprises a supporting plate for accommodation of a work piece and a clamping plate mounted on the supporting plate. A clamping drive for actuation of the clamping plate supports itself on the supporting plate.Type: ApplicationFiled: April 9, 2003Publication date: October 16, 2003Inventors: Heinz Fransing, Andreas Oberndorfer, Theodor Janocha
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Patent number: 6609469Abstract: A holder for material to be sewn in the form of a buttonhole frame has a frame plate (18) and a movable clamping element (24) with passages (20, 30). The holder (10) for material to be sewn can be fixed in place on a displacement mechanism of a sewing machine, and the material to be sewn can be clamped between the frame plate (18) and the clamping element (24) with the aid of a pressure element (34). To make possible space-saving and assured clamping, a wedge surface (38) is provided which, in the course of the movement of the pressing element (34) into the position in which the material to be sewn is clamped, builds up a pressing force in the clamping element (24) against the frame plate.Type: GrantFiled: January 15, 2002Date of Patent: August 26, 2003Assignee: VSM Group ABInventor: Rolf Kessler
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Publication number: 20030131770Abstract: A CNC controlled buttonhole sewing machine comprises work piece clamps with sliding drives for displacement from an initial position of spread, by a length of spread, into a final position of spread. The sliding drive is an electric positioning motor that is allocated to a work piece clamp. Further provision is made for a control unit with data storage, in which to store data, for displacement of the work piece clamp by a given length of spread.Type: ApplicationFiled: December 5, 2002Publication date: July 17, 2003Inventors: Thomas Noltge, Heinz Fransing, Andreas Oberndorfer, Theodor Janocha
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Patent number: 6105519Abstract: An eyelet buttonhole sewing machine has a housing with a stand and an arm. A table for carrying an article being sewn is driven in two mutually perpendicular directions (x, y) on the housing. A clamp for the article being sewn is fastened on the table. A needle bar which is mounted in the arm, is driven so as to move up and down and has a needle at its lower end. The clamp for the article being sewn has two arms fastened on a pedestal connected to the table, each arm having a clamping plate provided to bear on the article being sewn. The fastening points of the two arms on the pedestal are substantially adjacent to one another, and both arms are angled in such a manner that their fastening points are offset to the same side of the longitudinal axis of the arm.Type: GrantFiled: March 9, 1999Date of Patent: August 22, 2000Assignee: Durkopp Adler AGInventor: Eberhard Kastrup
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Patent number: 5931106Abstract: A sewing machine, in particular a buttonhole sewing machine, is equipped with needle-thread-clamping scissors which have a lower half provided with a cutting edge at its tip portion. They further have an upper half pivotal relative to the lower half and having a cutting edge at its tip portion. Further, they have a clamping jaw to be pressed elastically on the tip portion of the upper half for clamping and holding a tail piece of a needle thread. The upper half can be pivoted in such a way that a receiving opening for the needle thread is formed in an opened position of the scissors, whereas, in a closed position, the needle thread is cut and the tail piece of the needle thread is clamped and retained between the upper half and the clamping jaw. The upper half can further take a third position in which the tip portion of the upper half is free from the clamping jaw and the tail piece of the needle thread is released.Type: GrantFiled: May 19, 1998Date of Patent: August 3, 1999Assignee: Durkopp Adler AktiengesellschaftInventors: Gerd Papajewski, Christian Mollenkamp, Bernd Pofalla
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Patent number: 5848573Abstract: A buttonhole sewing machine includes a holding mechanism attached to a holder arm which reciprocates in a direction perpendicular to an amplitude direction of a needle. The holding mechanism includes a workpiece holder plate and constitutes a parallelogram linkage. The holding mechanism maintains a parallelogram shape even when the holder plate slants on a fold of the workpiece, and securely holds the workpiece. This buttonhole sewing machine also includes a cutting mechanism which cuts thread and braid in a short manner even when the holder plate slants. The cutting mechanism has a rotary cutter and a fixed cutter, and the fixed cutter is fixed on the holder plate while inclined from a proximal portion to a distal portion. A wire member is connected to the mobile cutter to facilitate the rotation of the rotary cutter even when the holder plate slants.Type: GrantFiled: July 23, 1996Date of Patent: December 15, 1998Assignee: Juki CorporationInventors: Yasuaki Hirano, Kazuaki Ishii, Mitsuhiro Tachikawa
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Patent number: 5778807Abstract: A buttonhole sewing machine including stitching instrumentalities for forming zigzag stitches defining an eyelet-end buttonhole having an eyelet end portion at one end of a foot portion, by operations of a driving mechanism for operating a needle and looper device of the stitching instrumentalities, a feeding mechanism for feeding work fabric feeding table along X and Y axes, and a rotating mechanism for rotating a needle bar and looper base about an axis perpendicular to the X and Y axes, according to stitching data, and wherein the stitching data are compensated by a control device according to a designated one of compensation data sets stored in a compensation data memory.Type: GrantFiled: November 12, 1996Date of Patent: July 14, 1998Assignees: Mitsubishi Denki Kabushiki Kaisha, Brother Kogyo Kabushiki KaishaInventors: Yoshifumi Nishizawa, Jun Gamano, Hideo Ando, Akihiro Funahashi
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Patent number: 5752456Abstract: A buttonhole sewing machine including stitching instrumentalities for forming zigzag stitches defining an eyelet-end buttonhole having an eyelet end portion at one end of a foot portion, by operations of a driving mechanism for operating needle and looper device of the stitching instrumentalities, a feeding mechanism for feeding work fabric feeding table along X and Y axes, and a rotating mechanism for rotating needle bar and looper base about an axis perpendicular to the X and Y axes, according to primary stitching data, and wherein a data input device is provided for operation by an operator to specify at least one characteristic of a bar tack portion to be formed at the other end of the foot portion of the eyelet-end buttonhole, and a data generating device is provided for generating tacking data as secondary stitching data on the basis of the specified characteristic or characteristics, to stitch the bar tack portion.Type: GrantFiled: November 12, 1996Date of Patent: May 19, 1998Assignees: Mitsubishi Denki Kabushiki Kaisha, Brother Kogyo Kabushiki KaishaInventors: Yoshifumi Nishizawa, Jun Gamano, Hideo Ando, Akihiro Funahashi
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Patent number: 5609115Abstract: A buttonhole closing device for a lockstitch bar tacking sewing machine comprises a feed plate for holding the buttonhole of a sewn product thereon, an arch clamp frame which is supported by the feed plate on the side thereof so as to be vertically swingable, a first and a second movable clamp feet which are swingably connected to the arch clamp frame by way of pins separately and which are arranged on the left and right sides of a center clamp foot at the clamp portions formed at the front ends thereof respectively, a clamp foot unit driving mechanism, pin portions and cam portions for converting the longitudinal movement of the clamp foot unit driving mechanism into the lateral swinging of the first and second movable clamp feet and driving units for driving the clamp foot unit driving mechanism forward or backward.Type: GrantFiled: May 8, 1995Date of Patent: March 11, 1997Assignee: The Singer Company N.V.Inventors: Masanori Ayuta, Koichi Nakayama, Katsuo Hiratsuka
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Patent number: 5575226Abstract: An assembly performing for performing both material removal and sewing operations on stitchable material. In one embodiment, the assembly includes sewing and material removal units which are interconnected in a manner such that the sewing unit's sewing area is isolated from the material removal unit. Preferably, the material removal unit is separable from the sewing unit. In another embodiment, the assembly includes sewing and material removal units, the material removal unit including a material removal device, a receiving table with an aperture aligned with the material removal device, and an alignment device which is movable through the aperture to align stitchable material relative to the material removal device.Type: GrantFiled: August 5, 1994Date of Patent: November 19, 1996Assignee: Ralph's Industrial Sewing Machine CompanyInventors: Ralph Badillo, Paul Badillo
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Patent number: 5259328Abstract: A cutting device for a sewing system having a work table, and a material clamp on the work table for transporting sewing material to a cutting point. The cutting device includes two wedge-shaped knives arranged at the cutting point, for producing gusset cuts in the material, and an elongated opening in the work table for allowing the wedge-shaped knives to pass through the work table to cut the material. The cutting device further includes a clamping device for clamping the material at the cutting point so as to increase the tension in the material and thereby increase the controllability of the location at which the wedge-shaped knives make the gusset cuts. Preferably the camping device which includes two transversely movable clamp halves tightens the sewing material transverse to the direction of transport of the sewing material. Further, a slide plate attached to the surface of the work table includes shoulders or tensioning beads for tensioning the material.Type: GrantFiled: June 2, 1992Date of Patent: November 9, 1993Assignee: Durkopp Adler AktiengesellschaftInventors: Thomas Noltge, Klaus Moller
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Patent number: 5158026Abstract: A kit assembly for use in combination with sewing machines for purposes of removing portions of stitchable material around which a buttonhole or other desirable design is sewn by the sewing machine. In one embodiment, the kit includes a support assembly, a material removal device positioned within the support assembly, and a driver connected to the material removal device to supply the necessary forces to remove portions of material. The kit assembly may be attached to a sewing machine without requiring any substantial modification thereof and, if properly positioned, will not interfere with sewing operations and the components associated therewith. The kit assembly may be removed or disabled to allow the sewing machine to perform functions other than sewing buttonholes.Type: GrantFiled: December 26, 1990Date of Patent: October 27, 1992Assignee: Ralph's Industrial Sewing Machine CompanyInventors: Ralph Badillo, Badillop Paul
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Patent number: 5109785Abstract: A feeding device for independently feeding, by a preparatory device, a binder strip and flap strips to a garment held by a base presses. There are eight types of combination in feeding fashions, whether or not the binder strip is to be fed, whether or not one flap strip is to be fed, and whether or not another flap strip is to be fed (2.sup.3 =8). Various feeding fashions are provisionally set in order prior to actual sewing, and control means controls actual operations of the preparatory device in accordance with the feeding fashions and every feeding fashions.Type: GrantFiled: September 18, 1990Date of Patent: May 5, 1992Assignee: Brother Kogyo Kabushiki KaishaInventors: Kazushi Inoue, Shigeru Abe, Yuji Tagawa, Takashi Kondo, Yasuhiko Watanabe, Jun Shibata
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Patent number: 5019116Abstract: In the sewing unit for the successive production of a number of stitch groups in a workpiece, a carriage supported slidably in two opposite directions on a frame and bearing a stitch group sewing machine. The sewing unit is periodically driven by a drive unit back and forth. A clamping device, slidably supported on the frame, is periodically coupled to the carriage by a clutch unit. The stitch group sewing operation takes place during the synchronous motion of the stitch group sewing machine and the clamping device. When the sewing operation is completed and the carriage is at rest, a pushing device attached to the frame pushes the clamping device, once it has been uncoupled from the carriage, in the opposite direction to its previously executed motion, back into its initial position.Type: GrantFiled: June 5, 1989Date of Patent: May 28, 1991Assignee: Durkoppwerke GmbHInventor: Gerhard Riss
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Patent number: 4919061Abstract: For producing properly shaped button holes in which the first zigzag stitches of the first button-hole caterpillar pattern are formed flat by covering the needle-side piece of thread which is held clamped, the button-hole sewing machine 1 is provided with a push device 41, a release device 58 and a shift mechanism 78. In this way, the thread cutting and clamping device 26 is moveable in synchronism with a material-presser basket 9 during its first phase of motion (I-II) which is directed parallel to the sewing-material transport direction NV. Furhtermore, towards the end of the first movement phase I-II, the needle-side piece of thread which is held clamped at the beginning of the sewing is automatically released by the release device 58 at a predetermined place so that it is completely covered by the following zigzag stitches of the first button-hole caterpillar pattern 92.Type: GrantFiled: April 12, 1989Date of Patent: April 24, 1990Assignee: Durkoppwerke GmbHInventor: Gerhard Riss
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Patent number: 4669404Abstract: A device for moving a cloth clamp in an automatic sewing machine with desired speed variations which are necessary to change stitch densities during a sewing travel, wherein the speed variation is attained by arranging a hydraulic-pneumatic circuit including solenoid operated valves and other control elements in branched routes.Type: GrantFiled: March 17, 1986Date of Patent: June 2, 1987Assignee: Satoh Seiki Co. Ltd.Inventor: Katsuki Yoneda
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Patent number: 4665843Abstract: 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.Type: GrantFiled: April 9, 1986Date of Patent: May 19, 1987Assignee: Durkoppwerke GmbHInventors: Heinz Goldbeck, Horst Plassmeier, Herbert Struck
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Patent number: 4590870Abstract: The invention is concerned with a sewing apparatus having a sewing machine mounted on a work table, fabric workpiece clamping means capable of holding and releasing the fabric workpiece on the work table, and a feed driving mechanism for intermittently feeding the fabric workpiece clamping means, whereby machine sewing and fabric workpiece feed are repeated alternatingly thereby sewing buttons or forming buttonhole stitches to a plurality of sewing portions on the fabric workpiece. The sewing apparatus has auxiliary fabric workpiece clamping means operable independently of the fabric workpiece clamping means.Type: GrantFiled: October 15, 1985Date of Patent: May 27, 1986Assignee: Brother Kogyo Kabushiki KaishaInventors: Hideo Kawaguchi, Hideo Ando, Yasuhiko Watanabe
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Patent number: 4589358Abstract: 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.Type: GrantFiled: February 7, 1985Date of Patent: May 20, 1986Assignee: Durkoppwerke GmbHInventors: Heinz Goldbeck, Horst Plassmeier, Klaus Moller
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Patent number: 4459925Abstract: A cycle sewing machine equipped with an improved cloth feeding mechanism which is so arranged that, through rocking control of oscillating levers by a cloth feeding cam via cam rollers, a feed table is displaced in longitudinal directions of a sewing machine bed (i.e. in X directions) or in directions intersecting at right angles with the longitudinal directions (i.e. in Y directions), and by the composite movements as described above, the garment to be sewn is moved as desired with respect to sewing positions for two sewing needles vertically moving at predetermined positions, and thus, it has been made possible to simultaneously form the same seams at two positions of the garment in an efficient manner.Type: GrantFiled: September 7, 1982Date of Patent: July 17, 1984Assignee: Miyachi Sewing Machine Co., Ltd.Inventors: Nobuji Miyachi, Ken'iti Miyake
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Patent number: 4395960Abstract: Apparatus in conjunction with a twin needle tacker to facilitate loading and simultaneously tacking both ends of a rear or hip pocket opening.Type: GrantFiled: September 21, 1981Date of Patent: August 2, 1983Assignee: AMF IncorporatedInventor: Wilhelm H. Jung
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Patent number: 4344375Abstract: A sewing machine for sewing workpieces, comprises a stationary bottom part with an arm which has one end pivotally mounted on the bottom part and an opposite end overlying the bottom part. The arm is movable from a fixed sewing position to an inoperable position away from the point of stitch formation. A revolving looper is mounted on the end of the opposite arm and it has a thread exit opening and a needle is mounted for upward and downward movement in the bottom part for cooperation with the looper. The workpiece is clamped between the base part and the arm and the needle traverses the workpiece upwardly. The construction includes a looper thread guide member mounted on the opposite arm adjacent the looper and has a thread deflector located between the needle path and the thread exit opening of the looper and extending above the point of stitch formation directly laterally of the needle path crosswise to the axis of the looper.Type: GrantFiled: October 31, 1977Date of Patent: August 17, 1982Assignee: Pfaff Industriemaschinen GmbHInventor: Gunter Tolle
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Patent number: 4296696Abstract: A device for producing sewing seam patterns of stitch groups in a work, for example buttonholes, including a holding mechanism for displacing the work intermittently to perform individual sewing operations, and a sewing machine equipped with a work clamping mechanism which is displaceable relative to a needle bar performing a swinging motion, and which engages the work in the area of the seam pattern to be sewn, comprising, a guide arrangement connected to the sewing machine for displacing the sewing machine parallel to the direction of displacement of the clamping mechanism, and a drive mechanism connected to the guide assembly and controlled by movement of the clamping mechanism through which cyclic motions in conformity with stitch formation are imparted to the sewing machine along a distance corresponding to the length of a seam pattern to be formed, which motions are opposite in direction to those of the clamping mechanism.Type: GrantFiled: August 29, 1980Date of Patent: October 27, 1981Assignee: Eisele Apparate-und Geratebau GmbHInventors: Hermann Taddicken, Wolfgang Sachs
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Patent number: 4183309Abstract: There is disclosed a machine for selectively sewing four different kinds of buttonholes, i.e. (1) with an eye, (2) without an eye, (3) with a wedge bar tack, and (4) without a wedge bar tack. The machine accomplishes all of these different types of sewing with the use of only two shaped cams permanently arranged in the machine, the first of such cams being for sewing the eye, and the second of such cams being for sewing the bar tack. The machine has a support plate for the workpiece, such support plate being coupled with one end of a first two-armed lever the second end of which is formed as a pivot of a second two-armed lever whose first end is disengageably connected with the first cam. The second end of the second two-armed lever is disengageably connected with the second cam by way of further members comprising a rod which is rendered immobile in the disengaged position with respect to the overarm of the sewing machine.Type: GrantFiled: January 2, 1979Date of Patent: January 15, 1980Assignee: Elitex, Koncern textilniho strojirenstviInventors: Frantisek Bajer, Josef Nejedly, Milos Kral
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Patent number: 4181084Abstract: There is disclosed a buttonhole bar tacker sewing machine with a device for controlling the length of the buttonhole terminated by a wedge bar tack, the machine having a support plate for the workpiece and control members for exerting a reverse motion in the direction of the longitudinal axis of the buttonhole. The control device comprises a first cam, a cam for forming a wedge bar tack and at least one further cam coupled in its motion with the first cam for bar tacking the eye of the buttonhole. The further cam for bar tacking the wedge bar tack of the buttonhole is arranged reversibly rotatable about its axis of rotation and adjustable in its angular position and adjustable relative to the first cam and is further reversibly coupled in its motion with the reversible motion of the support plate in the direction of the longitudinal axis of the buttonhole.Type: GrantFiled: January 2, 1979Date of Patent: January 1, 1980Assignee: Elitex, Koncern Textilniho StrojirenstviInventors: Frantisek Bajerk, Josef Nejedly
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Patent number: 4181083Abstract: There is disclosed mechanism for controlling the workpiece pressure grippers of buttonhole bar tacker sewing machines, such machines having means for selectively cutting the buttonhole either before or after the sewing operation. The controlling mechanism comprises a first disengaging member for controlling the pressure grippers, and a second disengaging member for selectively starting and stopping the machine. The two disengaging members are disposed in the path of rotary motion of at least one part coupled in the motion both with the device for driving the workpiece support plate of the machine and with the cam which controls the cutting knife of the machine.Type: GrantFiled: January 2, 1979Date of Patent: January 1, 1980Assignee: Elitex, koncern textilniho strojirenstviInventors: Frantisek Bajer, Josef Nejedly, Milos Kral
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Patent number: 4134346Abstract: A sewing machine for sewing buttonholes in a workpiece comprises a stationary lower part and an arm having one end pivotally mounted on the lower part and having an opposite end which carries a rotary hook which cooperates with a reciprocating needle carried in the lower part. The arm is pivotal relative to the base part to move the arm from a fixable sewing position with said hook spaced by a predetermined distance from the needle at a stitch-forming area to a rest position in which it is spaced away from the stitch-forming area. A thread-monitoring device is located adjacent the needle for monitoring the thread and detecting any breakage thereof. The machine includes a buttonhole cutting mechanism which is connected to the drive means so as to periodically cut the workpiece. A clamp is carried by the upper arm and it has a lower portion which rests on a resilient support which is biased upwardly by a spring.Type: GrantFiled: October 27, 1977Date of Patent: January 16, 1979Assignee: Firma Pfaff Industriemaschinen GmbHInventors: Kurt Bolldorf, Walter Hager, Gunter Tolle
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Patent number: 4034689Abstract: A folding mechanism, for a braid strip, is supported on a table plate, in which there is installed a tow-needle sewing machine having a cutting knife working between the needles, with the folding mechanism being inclined downwardly toward the stitch forming area of the sewing machine. Folding of the braid strip is effected by a shape bar, having an inverted T-shape, adapted to be lowered into a folding groove, in a baseplate of the folding mechanism to fold the braid strip so that its borders extend upwardly. Clamping bars are displaceable parallel to the stem of the shape bar, on opposite sides thereof, to clamp and fold the braid strip around the shape bar.Type: GrantFiled: August 11, 1976Date of Patent: July 12, 1977Assignee: Pfaff Industriemaschinen GmbHInventors: Peter Hintzen, Erich Willenbacher