Oscillating Or Reciprocating Looper Patents (Class 112/199)
  • Patent number: 9587335
    Abstract: A threading device of a sewing machine includes a flow path switching member, a base portion, and a plurality of thread introducing portions. The flow path switching member includes a gaseous body inlet portion for receiving a compressed gaseous body, a gaseous body outlet portion provided to communicate with the gaseous body inlet portion for exhausting the gaseous body, and a cylindrical outer surface portion at which the gaseous body outlet portion is opened. The base portion includes a cylindrical inner surface portion into which the cylindrical outer surface portion of the flow path switching member is inserted and for supporting the flow path switching member in a rotatable manner, and a plurality of flow paths formed to communicate with the cylindrical inner surface portion. The plurality of thread introducing portions are provided at the base portion to communicate with respective outlet sides of the plurality of flow paths.
    Type: Grant
    Filed: May 6, 2015
    Date of Patent: March 7, 2017
    Assignee: Janome Sewing Machine Co., Ltd.
    Inventors: Eiichi Shomura, Ushio Yokoyama, Shintaro Haraguchi
  • Patent number: 8939097
    Abstract: A threading device for a sewing machine lower looper is disclosed that can thread a lower looper safely and reliably by reliably preventing a main shaft from rotating when an operation of threading the lower looper is carried out.
    Type: Grant
    Filed: April 26, 2013
    Date of Patent: January 27, 2015
    Assignee: Jaguar International Corporation
    Inventor: Yoshikazu Suzuki
  • Patent number: 8925472
    Abstract: Pressurized gas for carrying looper thread by gas is generated by gas supply pump operated by changing over a sewing-machine motor, which drives stitch forming device, looper threading is performed through loopers by one-touch operation. Gas carrying threading device of sewing machine, comprising: looper thread introduction mechanism inserts looper thread guided to loopers; hollow looper thread guide extends from looper thread introduction mechanism to looper thread inlets and has looper thread guide outlets; gas supply pump for performing looper threading by carrying looper thread by gas from looper thread introduction area through hollow looper thread guide to looper thread loop-taker point outlets; clutch for transmitting power from sewing machine motor M to drive shaft which drives stitch forming device including loopers at time of stitch formation or to gas supply pump at time of looper threading.
    Type: Grant
    Filed: February 17, 2012
    Date of Patent: January 6, 2015
    Assignee: Suzuki Manufacturing, Ltd.
    Inventors: Kouichi Sakuma, Masato Ishikawa
  • Patent number: 8893632
    Abstract: A thread hooking device for a hemming device of a sewing machine is provided with a swing arm driven to move by a drive shaft. The first hook is formed with a guide portion on which being slidably mounted a thread hooking member 40 located at a second end of the guide portion. The thread hooking member is formed a thread hooking portion, the thread is inserted into the thread groove via the thread hooking portion and then extends out of the thread hole. The thread guiding member moves from the second end of the guide portion to the first end of the guide portion, when the thread hooking is aligned to the first end of the guide portion, the thread is inserted through the thread hole, moving the thread hooking member to the second end of the guide portion makes the thread insert in the thread groove.
    Type: Grant
    Filed: June 18, 2013
    Date of Patent: November 25, 2014
    Inventor: Hsien-Chang Tseng
  • Patent number: 8857354
    Abstract: A threading to a looper is performed with one-touch operation. A looper threading/sewing changeover mechanism 30 including a push button 33 for a pressing operation of a push button shaft 32 that a control pin 31 is protruded and provided, a control groove cam 38 which includes a first control groove cam portion 34—a fourth control groove cam portion 37 which receive the control pin, a connecting movement plate 40 which supports a thread guide portion and which is elastically repelled toward a threading state that a thread guide outlet of the thread guide portion contacts to a looper thread inlet of the looper by a first spring 39, and a connecting positioning plate 82 which rotates together with a main shaft 2 integrally and has a peripheral surface 80 that a tip portion 41 of the push button shaft contacts and has a notch portion 81 that the tip portion of the push button shaft is fitted is provided.
    Type: Grant
    Filed: November 10, 2011
    Date of Patent: October 14, 2014
    Assignee: Suzuki Manufacturing, Ltd.
    Inventors: Kouichi Sakuma, Masato Ishikawa, Mitsuru Satou
  • Publication number: 20140190383
    Abstract: When performing the threading to the looper by one-touch operation, the abnormal changeover to the stitch forming state of the looper threading/stitch forming changeover mechanism during the gas supply operation of the gas supply pump is prohibited.
    Type: Application
    Filed: November 10, 2011
    Publication date: July 10, 2014
    Applicant: SUZUKI MANUFACTURING, LTD.
    Inventor: Masato Ishikawa
  • 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
  • Publication number: 20140083344
    Abstract: A threading to a looper is performed with one-touch operation. A looper threading/sewing changeover mechanism 30 including a push button 33 for a pressing operation of a push button shaft 32 that a control pin 31 is protruded and provided, a control groove cam 38 which includes a first control groove cam portion 34—a fourth control groove cam portion 37 which receive the control pin, a connecting movement plate 40 which supports a thread guide portion and which is elastically repelled toward a threading state that a thread guide outlet of the thread guide portion contacts to a looper thread inlet of the looper by a first spring 39, and a connecting positioning plate 82 which rotates together with a main shaft 2 integrally and has a peripheral surface 80 that a tip portion 41 of the push button shaft contacts and has a notch portion 81 that the tip portion of the push button shaft is fitted is provided.
    Type: Application
    Filed: November 10, 2011
    Publication date: March 27, 2014
    Applicant: SUZUKI MANUFACTURING, LTD.
    Inventors: Kouichi Sakuma, Masato Ishikawa, Mitsuru Satou
  • Publication number: 20120210922
    Abstract: Pressurized gas for carrying looper thread by gas is generated by gas supply pump operated by changing over a sewing-machine motor, which drives stitch forming device, looper threading is performed through loopers by one-touch operation. Gas carrying threading device of sewing machine, comprising: looper thread introduction mechanism inserts looper thread guided to loopers; hollow looper thread guide extends from looper thread introduction mechanism to looper thread inlets and has looper thread guide outlets; gas supply pump for performing looper threading by carrying looper thread by gas from looper thread introduction area through hollow looper thread guide to looper thread loop-taker point outlets; clutch for transmitting power from sewing machine motor M to drive shaft which drives stitch forming device including loopers at time of stitch formation or to gas supply pump at time of looper threading.
    Type: Application
    Filed: February 17, 2012
    Publication date: August 23, 2012
    Inventors: Kouichi SAKUMA, Masato Ishikawa
  • Publication number: 20110000413
    Abstract: One embodiment of the present invention relates to a machine for sewing, embroidering, quilting and/or the like. Another embodiment of the present invention relates to a method for sewing, embroidering, quilting and/or the like. In one example, the present invention may be applied (e.g., as a machine and/or method) to a multi-needle machine or method. In another example, the present invention may provide for automatic lower (or bottom) thread cutting. In another example, the present invention may provide for automatic lower (or bottom) thread cutting by utilizing the phase (that is, movement phase) of a return of a looper (or hook) to cut the lower (or bottom) thread.
    Type: Application
    Filed: June 30, 2010
    Publication date: January 6, 2011
    Inventor: Alberto Landoni
  • Publication number: 20100326341
    Abstract: A multi-thread single-line chain stitch line, consisting of at least three threads. This method provides for the formation of variable structures of stitches, based on varying sequences for the conjoining of several top threads, loaded to their individual needles, with several bottom threads, loaded to their individual loopers. The method suggests intertwining top threads between each other. The proposed stitch structure provides homogeneity of mechanical stresses in the stitch line, resulting in higher strength and durability. The machine to provide such stitch line comprises a revolver, bringing required needles to the operation point and intertwining threads during formation of the stitch line, and likewise comprising a revolver for bringing required loopers to the operation point. In one of the embodiments of the present invention, only three top threads are used, with the looper having no bottom thread loaded in it.
    Type: Application
    Filed: June 25, 2009
    Publication date: December 30, 2010
    Inventors: Askar Dzhamilevich Mingazhev, Bruce Alan Pelkey
  • Patent number: 7600481
    Abstract: An upper looper driving device of a sewing machine is provided. The device includes an upper looper driving shaft which is rotatable around an axis thereof, an upper looper holder having an upper end portion at which the upper looper is held, an upper looper swinging arm having one end portion supported by the upper looper driving shaft such that a position of the upper looper swinging arm is adjustable along an axial direction of the upper looper driving shaft and the other end portion to which the upper looper holder is rotatably coupled, and an upper looper guide slidably holding the upper looper holder. The upper looper guide is supported by a frame of the sewing machine such that a position of the upper looper guide is adjustable along a direction parallel to the axial direction of the upper looper driving shaft.
    Type: Grant
    Filed: February 22, 2008
    Date of Patent: October 13, 2009
    Assignee: Juki Corporation
    Inventor: Shuuji Fujita
  • Patent number: 7536964
    Abstract: A sewing machine includes an upper looper formed with a thread hole, an upper looper shaft which oscillates the upper looper between an upper position and a lower position, switching means operable to switch a coupled state and a decoupled state between the upper looper and the upper looper shaft, moving means for moving the upper looper, which has been decoupled from the upper looper shaft by the switching means, to the lower position, a thread guiding pipe formed with a thread discharging port, and first operating means operable to decouple the upper looper and the upper looper shaft via the switching means, and to move the thread discharging port of the thread guiding pipe to a position at which the thread discharging port is aligned with the thread hole of the upper looper in the lower position.
    Type: Grant
    Filed: March 26, 2008
    Date of Patent: May 26, 2009
    Assignee: Juki Corporation
    Inventor: Kazuya Sadasue
  • Patent number: 7523712
    Abstract: A sewing machine includes a looper formed with a thread hole, a looper shaft holding the looper, and a thread pipe fixed to the looper shaft. The thread pipe includes a thread inserting port at one end and a thread discharging port at the other end. The sewing machine further includes a nozzle from which air is sprayed toward the thread inserting port, a switching mechanism operable to disconnect the looper from the looper shaft when the looper is at a front position, and a moving member which moves the looper to a rear position when the looper is disconnected from the looper shaft by the switching mechanism. When the looper is disconnected from the looper shaft and is moved to the rear position, the thread discharging port matches the thread hole, and the thread inserting port becomes close to the nozzle.
    Type: Grant
    Filed: November 13, 2007
    Date of Patent: April 28, 2009
    Assignee: Juki Corporation
    Inventor: Kazuya Sadasue
  • Publication number: 20090038519
    Abstract: Chain-stitch sewing machine includes: a looper provided under a needle plate and having a thread lead-in port and thread lead-out port, the looper being rotationally driven in synchronism with a sewing operation; a plurality of thread feed ports connecting to different thread supply sources; and a connecting member having a thread passage, the connecting member selectively connecting any one of the plurality of thread feed ports to the thread insertion port of the looper via the thread passage. Threading mechanism passes the sewing thread, fed via the thread feed port connected by the connecting member to the thread insertion port of the looper, into the thread insertion port and causes the sewing thread to be taken out via the inserted thread lead-out port of the looper.
    Type: Application
    Filed: April 18, 2006
    Publication date: February 12, 2009
    Applicant: TOKAI KOGYO MISHIN KABUSHIKI KAISHA
    Inventors: Ikuo Tajima, Satoru Suzuki, Sei Kato
  • Patent number: 6880472
    Abstract: A looper threading apparatus includes a threading member capable of holding a thread in a tip portion and inserting the thread through a thread hole, a guide member for movably accommodating the threading member and guiding the threading member to the thread hole, and a support member for supporting the guide member to freely approach and separate from the thread hole provided on an extended line of the threading member accommodated by the guide member. Moreover, there is provided a moving mechanism for moving the threading member and the guide member along an axis of the thread hole provided on the extended line. The moving mechanism moves the guide member and the threading member with respect to the thread hole provided on the extended line in such a manner that the tip portion of the threading member penetrates through the thread hole.
    Type: Grant
    Filed: December 16, 2003
    Date of Patent: April 19, 2005
    Assignee: Juki Corporation
    Inventor: Toshio Horiuchi
  • Patent number: 6814015
    Abstract: In a looper and cutter drive mechanism for sewing machine, an upper looper and a lower looper are respectively disposed below a throat plate, respective loop-taker points of these loopers are arranged in the same direction such that the loop-taker points pass a front side of the needle as seen in the stitching direction. The upper looper and the lower looper are driven such that the upper looper and the lower looper perform movements having traces on planes substantially parallel to each other. Due to such a constitution, the looper drive mechanism has both of the lockstitching function and the over-edge stitching function and can perform both functions by a single sewing machine.
    Type: Grant
    Filed: June 10, 2002
    Date of Patent: November 9, 2004
    Assignee: Suzuki Manufacturing, Ltd.
    Inventor: Sakuma Kouichi
  • Publication number: 20040149192
    Abstract: A looper threading apparatus includes a threading member capable of holding a thread in a tip portion and inserting the thread through a thread hole, a guide member for movably accommodating the threading member and guiding the threading member to the thread hole, and a support member for supporting the guide member to freely approach and separate from the thread hole provided on an extended line of the threading member accommodated by the guide member. Moreover, there is provided a moving mechanism for moving the threading member and the guide member along an axis of the thread hole provided on the extended line. The moving mechanism moves the guide member and the threading member with respect to the thread hole provided on the extended line in such a manner that the tip portion of the threading member penetrates through the thread hole.
    Type: Application
    Filed: December 16, 2003
    Publication date: August 5, 2004
    Applicant: JUKI CORPORATION
    Inventor: Toshio Horiuchi
  • Patent number: 6450109
    Abstract: A feeding device for a hemstitching machine includes a base having a feeding end with a protrusion extending from the feeding end and being inclined relative to the plane of the base. A slot is longitudinally defined in the base opposite to the feeding end. A sliding shuttle is slidably mounted on the base and has a groove defined to correspond to the protrusion of the base. The sliding shuttle includes two opposite sides each having a positioning plate attached to the sliding shuttle. A rotating shuttle rotatably attached to the base includes a U-shaped pivot seat pivotally attached to the base. A torsion spring is mounted in the pivot seat and secured between the pivot seat and the base. A drive arm extends from the pivot seat and a handle extends from the bottom of the pivot seat.
    Type: Grant
    Filed: September 5, 2001
    Date of Patent: September 17, 2002
    Assignee: Three Way Industrial Co., Ltd.
    Inventor: Ming-Yang Lu
  • Patent number: 6422165
    Abstract: An apparatus for preventing the raveling of a seam wherein a looper thread hanging hook for catching a looper thread which is allowed to pass through a loop of a needle thread immediately before the completion of a sewing operation and a driving mechanism of the hook together with a mechanism for cutting the looper thread and the needle thread are arranged on the right side of a needle drop point of a sewing machine.
    Type: Grant
    Filed: October 23, 2000
    Date of Patent: July 23, 2002
    Assignee: Yamato Mishin Seizo Kabushiki Kaisha
    Inventors: Yoshiyuki Tanaka, Takayuki Hayashida
  • Patent number: 6343558
    Abstract: An apparatus for high speed attachment of a cord to a piece of receiving material is characterized by one or more pins which engage the cord, pierce the receiving material and draw the cord through the receiving material from the first side to a second side thereof so that open loops are formed in the cord on the second side of the receiving material. The pins may be implemented as a push pin and a spreader pin pair movably mounted relative to each other and each of which is adapted to grasp the cord and penetrate the receiving material. The loop(s) are formed as the push pin and spreader pin move relative to each other. The apparatus further comprises a floating shuttle, not attached to the frame of the apparatus but supported by a series of gear assemblies. The pins move relative to the shuttle in a single direction causing the shuttle to engage an end portion of the cord, drawing the cord through the open loops so as to complete the lacing stitch of the cord through the receiving material.
    Type: Grant
    Filed: April 28, 1999
    Date of Patent: February 5, 2002
    Inventor: Daniel R. Shepard
  • Publication number: 20010037754
    Abstract: The invention provides a sewing machine which comprises needle 1 that moves up and down while sticking into a cloth W on a needle plate and a looper 2 that projects and withdraws under the needle plate so that the looper 2 projects to catch a needle thread 10 left under the needle plate in accordance with the rise of the needle 1 and draw out the thread in accordance with the feeding of the cloth W, and on the other hand, the needle 1 falls to catch the looper thread left under the needle plate upon the withdrawal of the looper 2, whereby multi-thread chain stitches or covering stitches are formed, wherein a retainer rod 30 is provided which projects and withdraws backward and forward within a plane roughly in parallel with the feed surface of the cloth W while interlocked with the rise and fall of the needle 1, and this retainer rod 30 catches the looper thread 20 at the projection side of the looper 2 ahead of the needle 1 when projecting rearward, and holds the caught looper thread 20 between the rod and n
    Type: Application
    Filed: May 1, 2001
    Publication date: November 8, 2001
    Inventor: Yoshiyuki Tanaka
  • Patent number: 6119613
    Abstract: A method and apparatus for preventing a seam from raveling in a double chain stitch sewing machine according to the present invention are applied to sewing of cloth by a double chain stitch sewing machine. Near the sewing end point for forming a double chain stitch by collaboration of a plurality of needles and a looper, the looper thread consecutive to the looper from the cloth is hooked and engaged on the hook at the left side of the needles. After driving the sewing machine for a half stitch or one stitch in this state, the looper thread hooked on the hook is cut off. Simultaneously with this cutting or before or after the cutting, the needle thread loop consecutive to the needles from the sewing end of the cloth through the looper is cut off between the looper and the cloth. Further, capturing the cut looper thread consecutive to the looper from the cloth, the end of the cut looper thread is pulled out from the final needle thread loop at the end of sewing.
    Type: Grant
    Filed: August 4, 1998
    Date of Patent: September 19, 2000
    Assignee: Pegasus Sewing Machine Mfg. Co., Ltd.
    Inventors: Osamu Douyasu, Masami Yamanaka
  • Patent number: 6109195
    Abstract: An over-lock sewing machine executing an over-edge chain stitch and a double-chain stitch includes a sewing machine motor for driving a needle bar so that the needle bar is moved upward and downward, a sewing needle mounted on a lower end of the needle bar, an upper looper and a lower looper forming stitches in cooperation with the sewing needle, and a stepping motor for driving the lower looper so that the lower looper is rocked.
    Type: Grant
    Filed: August 18, 1998
    Date of Patent: August 29, 2000
    Assignee: Brother Kogyo Kabushiki Kaisha
    Inventors: Hidetaka Inagaki, Nobusuke Nagasaka, Katsuya Watarai
  • Patent number: 6047653
    Abstract: A sewing machine for forming a "lock stitch" in a fabric material includes a reciprocally-mounted needle bar, a reciprocally-mounted needle thread take-up lever, and a rotary hook assembly located beneath the needle bar. In one embodiment, the sewing machine includes a needle thread take-up lever mounting and reciprocally moving device for reciprocally moving the take-up lever such that the distal needle thread engagement end thereof moves up and down in an arcuate path at a constant speed in timed relationship with the reciprocal movement of the needle bar.
    Type: Grant
    Filed: June 13, 1997
    Date of Patent: April 11, 2000
    Inventor: David R. Cash
  • Patent number: 5875723
    Abstract: A portable carpet binding machine comprising a housing defining an interior region, a drive mechanism supported by the housing and at least partially disposed in the interior region, a prime mover operatively coupled to the drive mechanism for providing motive power to the drive mechanism, a sewing assembly driven via the drive mechanism for sewing a strip of material to a piece of carpet, the sewing assembly including a binder guide, a sewing needle and a looper, the binder guide operating to fold the strip of material around an edge portion of the piece of carpet, the sewing assembly, when driven, operating to stitch the strip of material to opposite sides of the edge portion of the piece of carpet using first and second pieces of thread. The portable carpet binding machine includes a carpet feeding assembly including a feed driver mechanism and a coacting puller mechanism operating in substantially synchronous movement to linearly feed the piece of carpet relative to the sewing assembly.
    Type: Grant
    Filed: January 17, 1998
    Date of Patent: March 2, 1999
    Assignee: Binders Group, Inc.
    Inventor: Terry Lobur
  • Patent number: 5865132
    Abstract: A looper drive assembly for a buttonhole sewing machine includes a long arm which is driven by a double cam, followers and an oscillating plate at one end and the arm generally reciprocates longitudinally. V-shaped plates are pivoted at a second end of the arm. Ends of the V-shaped plates are connected to rocking links which carry the looper needles. The links are pivoted on shafts and support the V-shaped plates and the second end of the arm. As the arm reciprocates, the V-shaped plates swing, pull and push lower ends of the link and oscillate the links around shafts for alternating engagement of the looping needles with thread carried through a fabric by a main needle.
    Type: Grant
    Filed: February 21, 1996
    Date of Patent: February 2, 1999
    Assignee: AMF Reece, Inc.
    Inventors: Rudy Papajewski, deceased, Gerd Papajewski
  • Patent number: 5848572
    Abstract: A mechanism for a sewing machine for use in forming stitches by use of a looper thread which is controlled by a looper. This mechanism is adapted so that the looper thread which is run from a thread-thru hole to a stitch forming station is prevented from skipping over a needle penetrating point when a looper is moved upon descending of a needle, whereby stitches are formed without any skip stitch.
    Type: Grant
    Filed: May 16, 1995
    Date of Patent: December 15, 1998
    Assignee: Juki Corporation
    Inventor: Hitoshi Ito
  • Patent number: 5732639
    Abstract: A right looper release mechanism in an overlock sewing machine is disclosed comprising a vertically movable needle having a needle thread, a right looper disposed under the vertically movable needle and reciprocally movable in a direction crossing the vertically movable needle, a rear driving lever attached to the right looper and engaged in a right looper shaft so as to be freely turned relative thereto, a front driving lever fixed to the right looper shaft, a fixing screw member inserted in a throughhole of the front driving lever so as to be freely turned, said fixing screw member having a male screw being screwed into a female screw 3a of the rear driving lever so as to transmit a motion of the right looper shaft to the rear driving lever by way of the front driving lever, and an elastic member for elastically biasing the fixing screw member in a direction to release the fixing screw member so as to be unscrewed from the female screw of the rear driving lever.
    Type: Grant
    Filed: August 1, 1996
    Date of Patent: March 31, 1998
    Assignee: The Singer Company N.V.
    Inventors: Shinji Kojima, Masanori Mizunuma
  • Patent number: 5704302
    Abstract: A looper device includes a rod slidably supported in a sewing machine and allowed to move up and down. A looper is secured on the upper end of the rod and includes a hole formed in the front end and includes a support formed on the rear portion. A lever is coupled to the support at a pivot shaft and includes an extension extended from the front end for engaging with the front end of the looper and forming a shoulder which may engage with and may feed a thread upward. The lever includes a member for positioning the lever relative to the looper.
    Type: Grant
    Filed: September 25, 1996
    Date of Patent: January 6, 1998
    Inventor: Hsien Chang Tseng
  • Patent number: 5676077
    Abstract: A multi-needle chain stitch sewing machine with a thread thread severing system and method thereof for cutting needle threads between two isolated stitched patterns of a fabric. The multi-needle sewing machine includes a plurality of loopers and respective needles, a thread severing strip located in close proximity and transversely across each looper, and eccentric guides connected to the thread severing strip for extending the thread severing strip to cut the needle threads and for retracting the thread severing strip so that the thread severing strip does not contact the needle threads during the stitching operation.
    Type: Grant
    Filed: February 16, 1995
    Date of Patent: October 14, 1997
    Inventor: Giannino Landoni
  • Patent number: 5546878
    Abstract: A looper drive mechanism for a sewing machine includes: two loopers; looper drive shafts for driving the loopers; a main shaft extending across one plane transverse to the looper drive shafts; and torque transmission units for transmitting rotation of the main shaft to the looper drive shafts. The transmission units include: two slant grooved cams fixed to the main shaft and having grooves each extending through a full circumference and slanting relative to the main shaft; U-shaped followers each having two rollers, each of the rollers being supported by the looper drive shaft and rotating about its own axis within the groove of the slant grooved cams; and connection pins for pivotally mounting the U-shaped followers on the looper drive shafts so that the U-shaped followers are not rotatable in a direction in parallel with a line connecting the two rollers with each other but rotatable in a direction perpendicular to the line connecting the two rollers with each other.
    Type: Grant
    Filed: July 28, 1994
    Date of Patent: August 20, 1996
    Assignee: Suzuki Manufacturing Co., Ltd.
    Inventor: Kouichi Sakuma
  • Patent number: 5544604
    Abstract: A method of forming a stitch and the stitch which includes three needle threads and cooperating looper threads for forming three parallel rows of stitches that are joined by a spreader thread that lies on the upper surface of the work piece. The spreader thread follows a serpentine pattern and is configured to lie both forward of and rearward of the penetrating points of the needle threads such that it connects and covers the three parallel rows of stitches.
    Type: Grant
    Filed: December 19, 1994
    Date of Patent: August 13, 1996
    Assignee: Union Special Corporation
    Inventor: Frank F. Winter
  • Patent number: 5540162
    Abstract: A looper drive for a chain stitch sewing machine that includes a flexible connection that includes an intermediate guide rod that extends between a crank arm and the looper shaft. The intermediate guide rod is mounted to pivot on the crank arm and is constructed to allow a receptacle that is carried by the looper shaft to swivel or oscillate relative thereto. The intermediate guide rod carries a ball which extends into a cylindrical-shaped opening formed in the receptacle.
    Type: Grant
    Filed: December 9, 1994
    Date of Patent: July 30, 1996
    Assignee: Union Special GmbH
    Inventors: Dieter Schopf, Manfred Rosnitscheck
  • Patent number: 5517933
    Abstract: A mechanism and method for forming a facing seam at a relatively high rate that will insure that the cover thread is properly interwoven between each stitch of two parallel rows of stitches. The facing seam is formed by two needles and cooperating loopers for forming two parallel rows of stitches that are joined by a cover thread that lies on the upper surface of the work piece. The cover thread is controlled by a conventional spreader and a cover thread assist member. The cover thread assist member is formed from a lightweight hardened wire that is fixed to a mid portion of the conventional spreader.
    Type: Grant
    Filed: January 19, 1994
    Date of Patent: May 21, 1996
    Assignee: Union Special Corporation
    Inventor: James M. Karaba, Jr.
  • Patent number: 5481994
    Abstract: A thread cutter for a chainstitch sewing machine includes a base plate, a cutter arm, a pincher, a cutter, a hook rod arm, a hook rod and a swing arm combined together. The hook rod arm is movably connected with the cutter arm and has its front end connected with the hook rod. The cutter arm has its front end firmly connected with a cutter on its upper surface and with the pincher on its lower surface and is also pivotally connected with the base plate. The swing arm is connected pivotally on the base plate and has its front head fitting in a notch of the rear end of the hook rod arm. A slide ring is fitted under a hole of the swing arm located in a guide slot of the cutter arm. The swing arm is moved by a driving means to swing to move the hook arm and the cutter arm forward and backward for cutting threads by a cutter fixed on the hook rod arm.
    Type: Grant
    Filed: April 7, 1995
    Date of Patent: January 9, 1996
    Inventor: Fei-Lung Ku
  • Patent number: 5465674
    Abstract: An overedge stitch sewing device comprising a straight sewing needle and a lower looper that travels in a curved path and has advanced timing relative to the sewing needle. The device may also contain a needle thread cam which is shaped such that the needle thread is in partial contact with the front surface of the needle thread cam during the needle stroke.
    Type: Grant
    Filed: July 12, 1994
    Date of Patent: November 14, 1995
    Assignee: Union Special Corporation
    Inventor: Matt J. Gosche
  • Patent number: 5445091
    Abstract: A looper (2) for single-thread chainstitch sewing machines comprises for the purpose of forming a chainstitch a thread guiding surface (22), which is disposed substantially parallel to the feed path of the looper. A thread driving device (23) and a thread retaining device (24), which is formed as a retaining step (25), render possible the interlinking of a sewing thread (8) with itself. (FIG.
    Type: Grant
    Filed: September 20, 1994
    Date of Patent: August 29, 1995
    Assignee: Union Special GmbH
    Inventor: Hans-Dieter Bartholoma
  • Patent number: 5431118
    Abstract: A dry sewing machine, or a sewing machine which can be operated without oiling. The machine of the preferred embodiment is particularly adapted for making a type 401 two thread chain stitch, used in commercial sewing operations. In addition to employing sealed bearings, novel spreader and rocker frame assemblies are employed.
    Type: Grant
    Filed: August 12, 1994
    Date of Patent: July 11, 1995
    Assignee: James Cash Machine Co., Inc.
    Inventor: David R. Cash
  • Patent number: 5347941
    Abstract: A looper thread guiding mechanism for facilitating setting of the looper thread to a double loop looper. A drum is rotatably provided at a side portion of the looper having a thread hole at a tip end portion thereof. A thread hooking portion is slidably movably provided along the looper. The thread hooking portion is connected to the drum by a resilient linking member. By angular rotation of the drum in one direction, the thread hooking portion is positioned adjacent the thread hole for facilitating the thread setting. By angular rotation of the drum in an opposite direction, the linking member is partially wound over the drum, and the thread hooking portion is moved toward a base portion of the looper.
    Type: Grant
    Filed: April 9, 1993
    Date of Patent: September 20, 1994
    Assignee: Brother Kogyo Kabushiki Kaisha
    Inventor: Yasuo Mizuno
  • Patent number: 5315945
    Abstract: An apparatus and a method for supplying thread in a chain stitch sewing machine are disclosed, the apparatus comprising a needle vertically reciprocating between a top end point and a bottom end point in one sewing cycle; a looper horizontally reciprocating in one sewing cycle; a thread supply device for forcibly supplying a needle thread to the needle; and a thread supply control device for controlling the thread supply device so that the needle thread is supplied in at least two periods in each sewing cycle, the periods being discontinuous.
    Type: Grant
    Filed: June 26, 1992
    Date of Patent: May 31, 1994
    Assignee: Pegasus Sewing Maching Mfg. Co., Ltd.
    Inventor: Minoru Nakano
  • Patent number: 5299516
    Abstract: A looper drive cam is formed of a cylindrical cam which is fixed to a main shaft so that its axis is inclined thereto at an angle of .theta.. A looper drive fork forming an U-shaped cam follower is attached to a looper drive shaft, and is engaged with the inclined cam. The fork is attached to the looper drive shaft with a degree of freedom which allows for deviation between axes of the main shaft and the looper drive shaft. As the main shaft rotates, a cam face of the inclined cam changes in a range of .+-..theta. in a plane containing the main shaft, so that the fork rotates to rotate the looper drive shaft. Owing to the freedom of degree of the fork thus attached, the motion is transmitted smoothly, and wear and rattling are prevented.
    Type: Grant
    Filed: July 1, 1992
    Date of Patent: April 5, 1994
    Assignee: Suzuki Manufacturing Co., Ltd.
    Inventor: Kouichi Sakuma
  • Patent number: 5275116
    Abstract: A radially facing circumferential surface of a cam, in at least some planes which radiate from the cam axis, includes lines which are inclined relative to the cam axis. The inclinations of these lines vary from one axial plane to another, except in the dwell regions of the cam. A wobble member is supported for oscillating movement about a wobble axis. One or more cam followers on the wobble member engage the cam on opposite sides of a transverse reference plane which is substantially perpendicular to the cam axis. During operation of the mechanism, the cam turns about its axis, and the wobble member oscillates about its axis. The mechanism is used in a sewing machine to move a looper.
    Type: Grant
    Filed: April 21, 1992
    Date of Patent: January 4, 1994
    Assignee: Merrow Machine Company, Inc.
    Inventor: William C. Daley, Jr.
  • Patent number: 5269240
    Abstract: An overcast sewing machine in which a plurality of different stitch types can be sewn.Various designs are disclosed for sewing alternatingly the stitch types 512 and 514, which consist of two needle threads, one lower looper thread and one overcast looper thread. In one design, the holder of the overcast looper can be fixed in a first working position, in which both needle threads are interlinked with the overcast looper thread, and can be displaced into a second working position, in which only one needle thread is interlinked with the overcast looper thread. According to another design, two thread eyes are provided in the overcast looper and the overcast looper thread is threaded through one of these thread eyes to form one of the stitch types and through the other thread eye to form the other stitch type. In addition, stitch type 504, consisting of three threads, can be formed by removing one needle.
    Type: Grant
    Filed: February 6, 1991
    Date of Patent: December 14, 1993
    Assignee: Pfaff Haushlatmaschinen GmbH
    Inventors: Helmar Holl, Gunter Meier
  • Patent number: 5269238
    Abstract: An electronically controlled multi-needle quilting machine including linking cylinder arranged between an eccentric integral with a rotating spindle and a lever, to drive in an oscillating motion a number of loopers which, in combination with a number of corresponding needles, perform stiching operations by double chain stitches on a layered material interposed between said members, said linking cylinder comprising a pneumatic cylinder controlled to change the extension of its rod during the various operational steps, whereby the link length is changed and the loopers may reach a position in which, by being provided with a blade they perform a cutting operation on thread of respective needle.
    Type: Grant
    Filed: September 23, 1992
    Date of Patent: December 14, 1993
    Assignee: Meca S.p.A.
    Inventor: Giannino Landoni
  • Patent number: 5249538
    Abstract: A sewing apparatus displays a stitch pattern and forcibly supplies a thread based on the displayed stitch pattern. The apparatus comprises a sewing mechanism, an automatic thread supply device, a key input unit, a memory, a selector and a display. The sewing mechanism has a sewing section which includes a needle and a looper driven in accordance with a rotation of a main shaft. The automatic thread supply device forcibly carries a needle thread and a looper thread to the sewing section. The key input unit sets lengths per stitch of the needle thread and the looper thread which are to be supplied by the automatic thread supply device to the sewing section. The memory stores a plurality of stitch patterns in correspondence with combinations of the lengths of the threads to be supplied per stitch. The selector selects one of the stitch patterns corresponding to the combination set by the key input unit. The display displays in graphics the stitch pattern selected by the selector.
    Type: Grant
    Filed: April 23, 1991
    Date of Patent: October 5, 1993
    Assignee: Pegasus Sewing Machine Mfg., Co., Ltd.
    Inventors: Minoru Nakano, Toru Yamazaki
  • Patent number: 5237942
    Abstract: An overlock sewing machine which is arranged such that a lower thread take-up lever is disposed independently of an upper looper thread take-up lever and that a lower looper thread take-up lever drive mechanism is fabricated independently of an upper thread take-up lever drive mechanism and adapted to connect thereto an adjust means for adjusting the amount of thread fed from the lower looper thread take-up lever.
    Type: Grant
    Filed: February 28, 1992
    Date of Patent: August 24, 1993
    Assignee: Juki Corporation
    Inventor: Shiro Satoma
  • Patent number: 5233935
    Abstract: A looper throw-out device containing a latch for catching the release lever of the looper throw-out device when the release lever is left in the unlocked position. The latch is mounted on the inside portion of the sewing machine cover. If an operator fails to lock the release lever before sewing, the latch catches the unlocked release lever when the operator attempts to close the sewing machine cover.
    Type: Grant
    Filed: May 15, 1992
    Date of Patent: August 10, 1993
    Assignee: Union Special Corporation
    Inventor: Frank F. Winter
  • Patent number: 5215022
    Abstract: An attachment for a looper is provided whereby one looper of a three (3) or more thread serger can be converted into a spreader for use during stitch formation. The attachment comprises a resilient band which can be quickly positioned over the throat of a looper and a longitudinal member which is pivotally attached to the band for convenient placement through the looper eyelet and which can be likewise easily manually removed without the use of tools.
    Type: Grant
    Filed: February 7, 1992
    Date of Patent: June 1, 1993
    Inventor: Lester S. Mullis
  • Patent number: 5168821
    Abstract: In threading an eyelet of a looper of a sewing machine, a slide member is displaced until a positioning portion of the slide member comes into contact with the looper. In this contact condition, a thread pushing projection for pushing a looper thread is displaced to penetrate into the eyelet of the looper so that the looper thread pushed by the thread pushing projection passes through the eyelet of the looper. The looper thread having passed through the eyelet is grasped by a grasping portion of the slide member. Thereafter, the thread pushing projection is retracted from the eyelet of the looper, and the slide member is returned to an original position, thus completing the threading operation.
    Type: Grant
    Filed: November 15, 1991
    Date of Patent: December 8, 1992
    Assignee: Brother Kogyo Kabushiki Kaisha
    Inventor: Osamu Kamiya