Thread End Clamps Patents (Class 112/253)
  • Patent number: 9486866
    Abstract: A power tool includes a sawing working device of an at least partially flat form and at least one actuator. The sawing working device is configured to produce a sawing cut in a working direction. The at least one actuator is configured to produce at least one oscillation in the sawing working device.
    Type: Grant
    Filed: September 30, 2014
    Date of Patent: November 8, 2016
    Assignee: Robert Bosch GmbH
    Inventors: Thomas Winkler, Helge Sprenger, Peter Schwenkel, Richard Schoenleber, David Gaenzle
  • Patent number: 8739714
    Abstract: A method for operating a chain stitch sewing machine and a chain stitch sewing machine, the chain stitch sewing machine having a pair of sewing members comprising a needle which pierces a sewing material and a gripper disposed below a sewing material rest, which can be moved along a movement path, where an upper thread is guided with the needle through the sewing material resting on the sewing material rest, which is linked to a lower thread. The lower thread is fed to a retaining element and is held in said element that is moved with regard to its direction of movement and/or speed of movement to the sewing material rest according to a movement path of a pivoting movement of the gripper in particular along a circular-arc-segment-shaped movement path.
    Type: Grant
    Filed: June 15, 2012
    Date of Patent: June 3, 2014
    Assignee: Nahmaschinenfabrik Emil Stutznacker GmbH & Co. KG
    Inventor: Harmut Klapp
  • Patent number: 6766752
    Abstract: A sewing machine includes a hook having a distal end formed with a thread hooking portion, and a thread hooking device mounted on the thread hooking portion of the hook. Thus, the thread hooking device includes a plurality of thread guide portions provided on the bottom of the thread hooking portion to draw a plurality of sewing threads of different patterns and colors, thereby enhancing the diversity of the sewing threads so as to satisfy the user's different requirements. In addition, the sewing threads can be introduced into the thread hooking portion rapidly and conveniently, thereby facilitating operation and replacement of the sewing threads.
    Type: Grant
    Filed: April 21, 2003
    Date of Patent: July 27, 2004
    Inventor: Tseng Hsien Chang
  • Patent number: 6332419
    Abstract: An auxiliary device of a sewing machine capable of making three net-like stitches has two clipping members connected to each other. A hooked plate is movably passed through between the clipping members to pull a first kind of threads for same to hold in position. The front ends of the clipping members are disposed under a curved hook of a thread guide, and relatively close to needles of the first threads such that, in sewing operation, the first threads can be connected with a net thread controlled by the thread guide and a shuttle to form the net-like stitch without possibility of the first threads falling off the clipping members and failing to connect the net thread.
    Type: Grant
    Filed: March 20, 2001
    Date of Patent: December 25, 2001
    Inventor: Fei-Lung Ku
  • Patent number: 6009819
    Abstract: An auxiliary device (6) for sewing up the starting end of a thread chain (F) in a chain stitch sewing machine (1) having a platform (2), a needle plate (3) and an edge cutter (4) comprises a suction and separating device (5) disposed subsequent to the needle plate (3) in sewing direction (N) for taking in and cutting off the thread chain (F) upon sewing a workpiece, a returning device for turning round the remaining end piece of the thread chain against the sewing direction (N), and a clamping and deflecting device disposed before the needle plate (3) in sewing direction for retaining the end piece of the thread chain turned round, and for laterally deflecting the same into the cutting area of the edge cutter (4).
    Type: Grant
    Filed: May 26, 1998
    Date of Patent: January 4, 2000
    Assignee: Nahtechnik Sahi Ges. m.b.H.
    Inventor: Johannes Sahl
  • Patent number: 5931106
    Abstract: 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: Grant
    Filed: May 19, 1998
    Date of Patent: August 3, 1999
    Assignee: Durkopp Adler Aktiengesellschaft
    Inventors: Gerd Papajewski, Christian Mollenkamp, Bernd Pofalla
  • Patent number: 5887537
    Abstract: A sewing machine comprises a holding device, by means of which the front end of the needle thread can be clamped and held. Further, a cutter is available, by means of which the front end of the needle thread can be cut off directly over the workpiece.
    Type: Grant
    Filed: June 12, 1997
    Date of Patent: March 30, 1999
    Assignee: Durkopp Adler Aktiengesellschaft
    Inventors: Rainer Panhorst, Peter Cygon, Manfred Klopper
  • Patent number: 5660127
    Abstract: A bobbin thread end holding device in a sewing machine in which an upper thread and a bobbin thread are used holds an end portion of the bobbin thread after cut. The bobbin thread end holding device has a cutter for cutting the upper thread and the bobbin thread, and a bobbin thread control member. The bobbin thread control member includes: a thread control hole into which the upper thread and the bobbin thread are led; and a prolongation extending from the control hole, for outwardly introducing the end portion of the bobbin thread cut by the cutter from the control hole.
    Type: Grant
    Filed: June 28, 1995
    Date of Patent: August 26, 1997
    Assignee: Juki Corporation
    Inventors: Takashi Yamashita, Mitsuo Watanabe
  • Patent number: 5655470
    Abstract: A sewing machine has at least one sewing head having a presser foot which is vertically reciprocally moved by a predetermined stroke in synchronism with a vertical movement of a needle bar. After completion of the sewing operation, an upper thread is cut in a position spaced by a suitable distance from a sewing needle mounted on the needle bar. A refuge mechanism is operable to move the presser foot to a refuge position for giving refuge to a part of the upper thread on the side of the sewing needle cut after completion of the sewing operation. The refuge position is out of the predetermined stroke.
    Type: Grant
    Filed: July 3, 1996
    Date of Patent: August 12, 1997
    Assignee: Tokai Kogyo Mishin Kabushiki Kaisha
    Inventors: Ikuo Tajima, Satoru Suzuki, Youichi Mizuguchi
  • Patent number: 5596940
    Abstract: Apparatus for treating an end portion of a sewing thread which is supplied from a thread supplying device and is guided by a guiding device to pass near a sewing needle of a sewing head of a sewing machine, the sewing head having a front surface facing a user who operates the sewing machine, a rear surface opposite to the front surface, and a side surface connecting between the front and rear surfaces, the apparatus including a downstream holding device which holds the end portion of the sewing thread guided by the guiding device, so as to stretch a portion of the sewing thread near the sewing needle, and a cover member which covers the sewing head, the cover member providing the front, rear, and side surfaces of the sewing head, the downstream holding device being provided on a visible portion of the side surface of the cover member which portion is visible from the user facing the front surface of the cover member.
    Type: Grant
    Filed: December 14, 1995
    Date of Patent: January 28, 1997
    Assignee: Brother Kogyo Kabushiki Kaisha
    Inventors: Takahiro Yamada, Masao Ogawa, Eiji Shibata
  • Patent number: 5447108
    Abstract: The invention relates to thread trimming devices for eyelet buttonhole machines. The invention comprises a thread trimming device having a snap action spring arm knife. As the thread hook positions the thread and gimp, a cam lifts up the end of the spring arm. The cam then releases the knife whose torque snaps down and cuts the thread and gimp against a second knife edge. The thread and gimp are also held together at this point for the next buttonhole by a thread retainer which is built into the knife.
    Type: Grant
    Filed: September 29, 1993
    Date of Patent: September 5, 1995
    Assignee: AMF Reece, Inc.
    Inventors: Joseph M. Hamill, Ronald A. Hulit, Anthony M. Lewandowski, II, Gerd Papajewski, Reinhold Papajewski
  • Patent number: 5431119
    Abstract: A thread end holding device for a sewing machine comprises a needle thread catching puller which is swingably supported on the side of a sewing machine arm and is driven to swing between a thread catching position and a home position, and which comprises a hook portion at the tip end thereof for catching a needle thread extending from a needle when said needle thread catching puller is at its thread catching position and holds the needle thread at its home position and first and a second holding members which are respectively mounted on the side of the sewing machine arm and is disengaged from the both clamping portions when the needle thread catching puller is at its thread catching position and enters a gap between the both clamping portions at the hook portion thereof so as to elastically clamp the end of the needle thread between the clamping portions when the needle thread catching puller is at its home position.
    Type: Grant
    Filed: October 7, 1993
    Date of Patent: July 11, 1995
    Assignee: The Singer Company N.V.
    Inventors: Shuichi Sato, Yoshiharu Kobayashi, Norio Komori, Shirou Ayusawa
  • Patent number: 5367969
    Abstract: An upper thread holding device for use in a sewing machine having a body and a needle from which an upper thread depends, the device includes a holding member pivoted to the body and movable between a waiting position and an upper thread holding position in such a manner that the holding member passes an upper thread taken-off position located between the needle and the waiting position, a driving device for moving the holding member, a stationary blade connected to the body so as to be in sliding engagement with a lower surface of the holding member and designed for cutting the upper thread in cooperation with the holding member in its return movement at the waiting position, and a press plate fixed to the stationary blade and defining a space therebetween in which the holding member is accommodated in its waiting position for holding between the press plate and the holding member.
    Type: Grant
    Filed: September 2, 1993
    Date of Patent: November 29, 1994
    Assignee: Aisin Seiki Kabushiki Kaisha
    Inventor: Shiro Nonaka
  • Patent number: 5337688
    Abstract: The apparatus provides: thread hooking means having a thread hooking member for hooking a thread having a predetermined tension, the thread hooking member being disposed in proximity of a moving path of a needle, and for retracting the thread hooking member to a predetermined first refuge position to draw the thread toward the first refuge position; cutting and holding means for cutting the thread drawn toward the first refuge position by the thread hooking means, by the cooperation of one surface of the thread hooking member and a cutting edge which is disposed in proximity of the one surface, and for holding the vicinity of the cut portion of the thread by the cooperation the other surface of the thread hooking member and a holding member which is resiliently pressed against the other surface; and means for, immediately after a sewing operation is started, retracting to a second refuge position separated from the first refuge position, to cancel the held state of the thread hold by the cutting and holding m
    Type: Grant
    Filed: June 15, 1993
    Date of Patent: August 16, 1994
    Assignee: Union Special Japan Ltd.
    Inventor: Katsumi Arima
  • Patent number: 5159889
    Abstract: An apparatus and method for creating an overlock or 504 stitch wherein the excess thread chain (65) extending from the sewing machine needles (19) and the hollow chaining (32) to the previously sewn garment part (60) is stretched and is cut by thread chain cutter (70) to create a leading thread chain of predetermined length extending form the sewing machine needle and the hollow chaining tongue. When cut, the thread chain recoils toward the hollow chaining tongue, and a stream of air draws the free end of the thread chain into the hollow chaining tongue. When the next work piece is moved through the sewing area, the thread chain in the hollow chaining tongue is attached to the work piece and is progressively drawn out of the hollow chaining tongue and oversewn in the overlock stitch.
    Type: Grant
    Filed: March 25, 1991
    Date of Patent: November 3, 1992
    Assignee: Atlanta Attachment Company
    Inventors: Elvin C. Price, Preston B. Dasher
  • Patent number: 5156103
    Abstract: An eyelet buttonhole sewing machine has a suction device between the throat plate and the wedge-shaped knife of the buttonhole cutting device. The suction device includes a suction tube and is connected to a vacuum generator, for instance an ejector nozzle or a transvector nozzle. The looper thread is brought near the suction device by a thread puller. When the looper thread is cut by the thread cutting device at the end of the sewing process, suction is applied to the suction tube, pulling the end of the looper thread into the opening of the suction tube. In this way, the looper-thread end assumes a well defined position in which it is disposed for being completely covered by the corresponding welt of the following buttonhole to be sewn. With the suction device and thread puller operating as described, it is no longer necessary to clean the buttonhole by cutting off the end of the looper thread.
    Type: Grant
    Filed: March 30, 1992
    Date of Patent: October 20, 1992
    Assignee: Durkopp Adler Aktiengesellschaft
    Inventors: Karl-Heinz Buschmann, Eberhard Kastrup
  • Patent number: 5144901
    Abstract: A thread holding device having a thread holding member and a holding force imparting member selectively engageable therewith for holding a leading end portion of a needle thread. The thread holding member and the holding force imparting member are pivotally movable by drive means through linking means. The thread holding member has a first angular rotational position at a position below a sewing needle for trapping the leading end portion of the needle thread, a second angular rotational position at a position beside the sewing needle for holding the thread in cooperating with the holding force imparting member, and a third angular rotational position or a retracted position. When the thread holding member is moved from its second to third angular positions, the needle thread leading end is released from the thread holding member.
    Type: Grant
    Filed: September 19, 1990
    Date of Patent: September 8, 1992
    Assignee: Brother Kogyo Kabushiki Kaisha
    Inventor: Hajime Suzuki
  • Patent number: 5027732
    Abstract: A thread end holding unit of a sewing machine employs a needle thread gripping puller driven so as to be positioned either at a thread catch position or a return position. The puller has a hook portion at a tip end thereof adapted for catching a needle thread extended from a needle when the needle thread gripping puller is positioned at the thread catch position. The needle thread is caught and held by the hook at the return position. First and second holding members are respectively fixedly mounted on a supporter fixed to the arm. These holding members have press portions forcibly pushed elastically by both sides of the needle thread gripping puller for pressing and holding the thread end of the needle thread caught by the hook when the hook portion is positioned at the return position.
    Type: Grant
    Filed: November 16, 1989
    Date of Patent: July 2, 1991
    Assignee: SSMC Inc.
    Inventors: Shuichi Sato, Shirou Ayusawa
  • Patent number: 5025738
    Abstract: A needle thread drawing device utilizes a thread end holding device rotatably mounted on an arm of a sewing machine. A needle thread gripping puller which can be disposed to be at a thread catch position or a return position has a hook portion at a tip end thereof for catching a needle thread extended downward from a needle hole of a needle. A needle thread drawing member is mounted swingably on the side of the arm and has a hook portion at a tip end thereof. A cam member is positioned at the side of the thread end holding device and is rotatable in synchronism with the puller for rotatably swinging the needle thread drawing member so that the hook portion can hold the needle thread when the needle thread holding portion is positioned over the needle hole of the needle and can draw a thread end of the needle thread when the hook portion of the puller is positioned under the needle hole of the needle when the puller is disposed in the thread catch position.
    Type: Grant
    Filed: November 16, 1989
    Date of Patent: June 25, 1991
    Assignee: SSMC Inc.
    Inventors: Shuichi Sato, Shirou Ayusawa
  • Patent number: 5025739
    Abstract: In the needle thread wiper of sewing machine according to the invention, the hook formed at the front end of a leaf spring is projected in or out from the front end of the guide element formed nearly in a J-form, and when inserting this hook into the front end of the guide element, the needle threads extending between the needle and cloth is hooked on the front end of this hook so as to be placed into the front end of the guide element together with the hook. At the front end of the guide element, at the positions corresponding to the both flat surfaces of the leaf spring, notches are formed so as to extend from the front end to the base part side. The needle thread introduced into the front end of the guide element is guided by the notches and placed deeply into the guide element. The needle thread is held merely in a state of being hooked between the hook and the guide element, and so that is easily unhooked, almost without any resistance, when the needle is lowered upon start of next sewing step.
    Type: Grant
    Filed: June 27, 1990
    Date of Patent: June 25, 1991
    Assignee: Pegasus Sewing Machine Mfg., Co., Ltd.
    Inventor: Tadashi Inoue
  • Patent number: 5020462
    Abstract: A slackened needle thread assuring unit includes a thread tension member mounted on a side wall of a frame secured to the bed of a sewing machine. A thread takeup is positioned above the thread tension member. A needle/bobbin thread cutter is positioned apart from and under the frame for cutting a needle thread. A thread end holder holds an end of the thread to be cut by the needle/bobbin thread cutter. A thread guide extending across the front portion of the frame has one end supported by a support plate and the other free end defining a hook. A drive mechanism supported by the support plate reciprocally moves the hook in the direction substantially perpendicular to the threading direction of the needle thread.
    Type: Grant
    Filed: August 18, 1989
    Date of Patent: June 4, 1991
    Assignee: SSMC Inc.
    Inventors: Shuichi Sato, Yoshiharu Kobayashi, Shirou Ayusawa
  • Patent number: 4962714
    Abstract: A thread end disposal unit in a thread cutting sewing machine has a thread end suction unit including a first suction tube having an open end positioned at the length of the starting end of a needle thread held by a thread end holder. A second suction tube is connected at a base end thereof to a base of the first suction tube via a suction device generating negative pressure for allowing the first suction tube to suck cut lengths of the needle thread. The device includes a Venturi-tube and an air compressor and a container storing the cut lengths as waste thread.
    Type: Grant
    Filed: May 22, 1989
    Date of Patent: October 16, 1990
    Assignee: SSMC Inc.
    Inventor: Norio Komori
  • Patent number: 4919061
    Abstract: 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: Grant
    Filed: April 12, 1989
    Date of Patent: April 24, 1990
    Assignee: Durkoppwerke GmbH
    Inventor: Gerhard Riss
  • Patent number: 4913073
    Abstract: The bottom plate of a cloth presser supporter is pivotally mounted on a lower end of the supporter adjacent a rear end of the plate. The plate has an L shaped slot, one slot leg being a needle location groove, the other slot leg being a needle thread guide. The plate has a knife receiving groove with a knife mounted therein. A thread holder holds the end of a thread vertically above the plate so that the thread when extended between the held thread end and the first zigzag stitch of the thread does not extend over a corner defined by the intersection of the side wall of one slot leg with the corresponding side wall of the other slot leg.
    Type: Grant
    Filed: May 22, 1989
    Date of Patent: April 3, 1990
    Assignee: SSMC Inc.
    Inventor: Norio Komori
  • Patent number: 4903623
    Abstract: A hemmer seamer assembly comprising an apparatus for positioning a chain of stitches for stitching onto fabric having a needle and a throat plate, including a device for positioning the chain of stitches forwardly of the needle, and a device for moving the fabric to the throat plate for sewing the chain onto the fabric.
    Type: Grant
    Filed: October 11, 1988
    Date of Patent: February 27, 1990
    Assignee: Union Special Corporation
    Inventors: Maximilian Adamski, Robert L. Kosrow, Stephen Ruderman
  • Patent number: 4879960
    Abstract: Apparatus and method for severing the needle and looper threads of a chain stitch formed by a sewing machine having an in-line looper system. The sewing machine has a needle plate and a needle carrying the needle thread through the material and the needle plate to form a needle loop of needle thread therebelow that has a needle side running to the needle. The apparatus comprises a stationary knife, a spring positioned below the stationary knife and biased in a direction toward the stationary knife, and a movable knife slidably mounted between the stationary knife and the spring which yieldingly urges the movable knife thereagainst. The movable knife has one penetrating end with a pair of axially offset barbs, a lagging barb and a leading barb closer to the penetrating end of the movable knife than the lagging barb. These three elements cooperate to hook and sever the needle side of the needle loop and the looper thread below the needle plate and prepare the looper thread for the next stitch.
    Type: Grant
    Filed: July 22, 1988
    Date of Patent: November 14, 1989
    Assignee: Kansai Special USA Corp.
    Inventor: Eugene R. Prais
  • Patent number: 4850293
    Abstract: A trimming device for trimming a top cover thread from a workpiece on a multiple needle sewing machine having a thread catching device which is movable between a counter-plate and a knife. In operation the top cover thread is picked up by the thread catching device between a workpiece and a top cover thread guide. A top cover thread trap serves as a counter-plate for the thread catching device. The knife is attached to the counter plate with a gap therebetween, with the thread catching device being swingable within said gap.
    Type: Grant
    Filed: July 28, 1988
    Date of Patent: July 25, 1989
    Assignee: Union Special G.m.b.H.
    Inventors: Wolfgang Norz, Gunter Rohr, Karl-Heinz Weingartner
  • Patent number: 4834009
    Abstract: An apparatus for cutting and positioning a chain of stitches for stitching onto material in a sewing machine having a needle and a throat plate, comprising, a cutting knife adapted to sever the chain of stitches after the chain has been sewn onto the material, a device adapted to move the severed chain to a position forwardly of the needle, and a gripping device adapted to be positioned at a level below the throat plate during sewing of the chain stitches onto the material, and to rise up and grip the thus positioned severed chain, and return to below the level of the throat plate to hold the chain, to effect incorporation of the chain during the initial stitches into the seam being formed.
    Type: Grant
    Filed: January 2, 1987
    Date of Patent: May 30, 1989
    Assignee: Union Special Corporation
    Inventor: John Van Eyk
  • Patent number: 4796552
    Abstract: An apparatus for positioning a chain of stitches for stitching onto material in a sewing machine having a cutting device, and a first blower for positioning the chain of stitches forwardly of the needle. The apparatus has a second blower for placing the chain in the path of the cutting device.
    Type: Grant
    Filed: May 18, 1987
    Date of Patent: January 10, 1989
    Assignee: Union Special Corporation
    Inventor: Maximilian Adamski, Jr.
  • Patent number: 4785753
    Abstract: An apparatus for positioning a chain of stitches for stitching onto material in a sewing machine having a needle and a throat plate. The apparatus has a blower for positioning the chain of stitches forwardly of the needle. The apparatus has grasping members for grasping the chain in the forward position. The apparatus also has a cylinder for moving the grasping members between a first position adjacent the throat plate when the chain is being grasped, and a second position away from the throat plate after the chain has been grasped to tighten the grasped chain.
    Type: Grant
    Filed: June 30, 1987
    Date of Patent: November 22, 1988
    Assignee: Union Special Corporation
    Inventor: Robert L. Kosrow
  • Patent number: 4738210
    Abstract: An attachment for a semi-automatic sewing machine ensures that any excess thread chain extending from the leading or trailing edge of a garment during an operation on the garment with the sewing machine, is stitched directly to the garment so that no loose or free ends of thread chain are provided. The completion of stitching by the sewing machine of a first garment is sensed and the first garment is engaged in response to the sensing by a rubber wheel which moves the garment away from the stitching needle more quickly than the sewing machine stitches the stitch chain. The excess thread chain is automatically severed by a movable plate rotating with respect to a stationary plate, and the excess severed thread chain is automatically positioned by an air blower in association with a rotatable thread catcher so that excess thread chain is stitched to the second garment by the sewing machine. The rotatable thread catcher comprises a tapered wheel with a serrated ring catching thread blown onto the wheel.
    Type: Grant
    Filed: November 24, 1986
    Date of Patent: April 19, 1988
    Inventor: J. Herbert Keeton
  • Patent number: 4733622
    Abstract: A needle thread end holder for a sewing machine having bobbin thread replenishing mechanism in which an annular groove formed in the presser securing screw accomodates a stretched rubber "O" ring so as to apply only a limited frictional resistance to a thread introduced beneath the "O" ring insufficient to abort a bobbin thread replenishing operation.
    Type: Grant
    Filed: February 24, 1987
    Date of Patent: March 29, 1988
    Assignee: SSMC Inc.
    Inventors: Robert H. Larsen, Jan Szostak
  • Patent number: 4658752
    Abstract: A method for drawing the free end of the needle thread from the upper workpiece surface to the lower workpiece surface when sewing the first stitch of a seam to be produced by a sewing machine having a reciprocable needle, which carries the needle thread drawn from a spool by means of a thread lever, at least one presser foot lowerable upon and liftable from the workpiece, and a rotatingly drivable hook, the point of which seizes and withdraws the needle thread for the stitch formation. In order to safely and automatically prevent the thread end of the needle thread from being clamped between the presser foot and the workpiece, the needle thread is held between the needle and the thread take-up lever while the needle thread loop is withdrawn by the hook beak, so that the thread end is drawn through the workpiece by the hook beak.
    Type: Grant
    Filed: April 10, 1986
    Date of Patent: April 21, 1987
    Assignee: Kochs Adler, AG
    Inventors: Werner Keilmann, Hans Scholl, Gunter Raupach
  • Patent number: 4655152
    Abstract: A thread clamp for sewing machines comprises a helical spring as a clamping element which is disposed in a bore extending crosswise to the feed direction of the work in a guide piece placed on the stitch plate. To obtain a very short closing path, the helical spring has in the region of the respective thread pull-off path windings whose mutual distance is greater than in the other regions. The helical spring is compressible by a setting drive for the fixed clamping of the threads.
    Type: Grant
    Filed: May 1, 1986
    Date of Patent: April 7, 1987
    Assignee: Pfaff Industriemaschinen GmbH
    Inventors: Eugen Angele, Ludwig Drechsel
  • Patent number: 4550672
    Abstract: A thread-holding device is used with a standard buttonhole machine having a support head, a stitching needle for a needle thread displaceably mounted on the support head, and a blade for cutting the needle thread after a stitching operation and forming thereon a free end extending laterally from the needle. The thread-holding device comprises a support plate pivoted on the head, and a thread clip having a pair of jaws displaceable between a closed position engaging each other for holding the thread and an open position for releasing it. An actuator on the support plate and carrying the thread clip can move same vertically between an upper position spaced laterally relatively far from the needle and a lower position laterally relatively close to the needle.
    Type: Grant
    Filed: May 4, 1984
    Date of Patent: November 5, 1985
    Assignee: Durkoppwerke GmbH
    Inventor: Eberhard Kastrup
  • Patent number: 4448139
    Abstract: A sewing machine having two needles supported in a needle holder, which needle holder is horizontally displacable, to present one needle to an active workstation in a prethreaded manner and simultaneously shift the other needle which has a different thread therein, into an adjacent inactive position. As the needles are being shifted, the needle moving to inactive status has its thread clamped against the needle holder by a wheel, to secure the thread from being pulled therefrom or straying. A vacuum tube arranged at each respective inactive position or station sucks the tail of the thread therein. A pair of thread guides, one for each thread, are arranged for vertical movement, to pullback on the dangling thread of the inactive needle, to prevent the thread from whipping during its inactive status. Each thread passes around a thread engaging wheel comprising a dual bobbin monitor arranged on a single axis.
    Type: Grant
    Filed: October 27, 1981
    Date of Patent: May 15, 1984
    Assignee: USM Corporation
    Inventor: Adolph S. Dorosz
  • Patent number: 4364319
    Abstract: In a double-needle lock-stitch sewing machine, an assembly for arresting threads being drawn from the needles by an uptake stroke of a thread lever, thereby ensuring predetermined lengths of thread at the needles for an ensuing stitch, comprises a spring-loaded clamp disposed between the sewing lever and the needles. The clamp is periodically actuatable via a system of levers in the sewing-machine head by a cam mounted on the sewing-machine base and cooperating with a radial lug on a shaft driving a rotary thread gripper and bobbin holder. A spring-loaded plate engaging a pair of thread-tension control disks is pivotable by the lever system to release the disks upon actuation of the clamp. The clamp is particularly useful in controlling the length of a leading thread portion prior to beginning a sewing seam.
    Type: Grant
    Filed: April 6, 1979
    Date of Patent: December 21, 1982
    Assignee: Durkoppwerke GmbH
    Inventors: Hermann Niehaus, Gunter Droste, Wilhelm Stapel
  • Patent number: 4228748
    Abstract: A system for controlling the starting end of a thread is disclosed in which air is provided via a conduit and nozzle to a point adjacent the needle and above the presser foot of the sewing machine. The arrangement is such that the air is controlled by a valve whose operation is in turn controlled by the position of the presser foot so that air is supplied only when the presser foot is raised and the sewing machine is in a stopped position.
    Type: Grant
    Filed: October 29, 1979
    Date of Patent: October 21, 1980
    Inventor: Armand A. Dufault
  • Patent number: 4220105
    Abstract: A device for orienting a chain of stitches severed from a completed workpiece to a position where the end is taken by a gripping apparatus and the intermediate portion placed in a predetermined location where it cannot be displaced by the next workpiece while incorporating the chain into the initial stitches of the seam being formed thereon.
    Type: Grant
    Filed: February 12, 1979
    Date of Patent: September 2, 1980
    Assignee: Rockwell-Rimoldi S.p.A.
    Inventor: Giovanni Palacino
  • Patent number: 4200050
    Abstract: Thread cutting device for lockstitch sewing machines equipped with vertical axis looptaker and provided with a thread catching member displacing around an axis parallel to the looptaker axis along a path passing over the looptaker, wherein the thread catching member is formed by a plate ending with a pointed portion having a notching extending upwardly for the needle thread catching and a small foil bent at a right angle relative to the pointed portion, the small foil being so shaped as to be provided with a bobbin thread catching zone and a bobbin and needle thread cutting zone, the cutting zone being closer to the sewn fabric than the needle thread catching zone and than the notching for the needle thread catching.
    Type: Grant
    Filed: September 5, 1978
    Date of Patent: April 29, 1980
    Assignee: Necchi Societa per Azioni
    Inventor: Nereo Bianchi
  • Patent number: 4072116
    Abstract: The throat slot, arranged in the needle plate for the passage of the needle, has in the right front portion thereof a groove. It is designed to retain the previously formed thread chain and prevent the formation of the overlock stitch until displaced by the passage of a fabric.
    Type: Grant
    Filed: February 28, 1977
    Date of Patent: February 7, 1978
    Assignee: Union Special Corporation
    Inventor: Joseph Nagy
  • Patent number: 4040370
    Abstract: A device carried by the presser foot of a sewing machine for severing a chain of stitches extending between a sewn workpiece and the needle of the machine which includes a gripping element for retaining the severed end of the chain extending from the needle and a guide means for aligning the chain with the needle axis in a manner whereby it would be incorporated into the seam of stitches formed in the following workpiece.
    Type: Grant
    Filed: September 29, 1976
    Date of Patent: August 9, 1977
    Assignee: Rockwell-Rimoldi S.p.A.
    Inventor: Nerino Marforio
  • Patent number: 4038933
    Abstract: A sewing machine having a needle plate with an integrally formed tongue on which a chain of stitches is formed. The tongue includes an internal bore pneumatically connected to a vacuum unit which is selectively activated to draw a chain of stitches severed from the previously seamed workpiece into the bore. The suction created by the vacuum is sufficient to hold the chain of stitches and permit their release during advance of the next workpiece so as to be incorporated in the seam formed therein.
    Type: Grant
    Filed: August 20, 1976
    Date of Patent: August 2, 1977
    Assignee: Rockwell-Rimoldi S.p.A.
    Inventor: Nerino Marforio