US3447498A - Loop stitch shuttle for sewing machines - Google Patents

Loop stitch shuttle for sewing machines Download PDF

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Publication number
US3447498A
US3447498A US644696A US3447498DA US3447498A US 3447498 A US3447498 A US 3447498A US 644696 A US644696 A US 644696A US 3447498D A US3447498D A US 3447498DA US 3447498 A US3447498 A US 3447498A
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United States
Prior art keywords
loop
thread
shuttle
needle
rotary hook
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Expired - Lifetime
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US644696A
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English (en)
Inventor
Yasukata Eguchi
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Janome Corp
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Janome Sewing Machine Co Ltd
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    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B1/00—General types of sewing apparatus or machines without mechanism for lateral movement of the needle or the work or both
    • D05B1/02—General types of sewing apparatus or machines without mechanism for lateral movement of the needle or the work or both for making single-thread seams
    • D05B1/06—Single chain-stitch seams
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B57/00—Loop takers, e.g. loopers
    • D05B57/02—Loop takers, e.g. loopers for chain-stitch sewing machines, e.g. oscillating
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B57/00—Loop takers, e.g. loopers
    • D05B57/02—Loop takers, e.g. loopers for chain-stitch sewing machines, e.g. oscillating
    • D05B57/04—Loop takers, e.g. loopers for chain-stitch sewing machines, e.g. oscillating rotary

Definitions

  • Loop stitches are used for basting material in such a manner that the row of stitches can be easily ripped. Loop stitches are used for temporarily attaching labels and for sewing shrinkable and expansible material such as tricot and jersey cloth. The operation for making a loop stitch on a sewing machine is quite dilferent from the formation of standard stitches since the period for maintaining the thread loop large and open is different and the loop stitch is formed of a single thread.
  • the present invention uses a rotary hook shuttle, and provides anchoring guide means for holding the thread loop formed by the rotary hook, and for smoothly releasing the loop.
  • the anchoring guide means are preferably provided on a loop stitch shuttle which is secured to the rotary hook for rotation with the same.
  • the present invention is also concerned with effectively carrying out the increase and reduction of the amount of thread supplied for loop stitches.
  • the anchoring guide means are constructed and arranged so that the period for holding the loop of the needle thread on the rotary hook starts at the time of the catching of the thread by the rotary hook, includes the rising of the needle to the upper dead center position and the descent of the needle eye to a position cooperating with the rotary hook, and ending at the time when the needle eye is inserted into the preceding loop.
  • This operation requires an angle of rotation of more than 280 of the main shaft, corresponding to an angle of rotation of 560 for the rotary shuttles which rotate at twice the rotary speed of the main shaft. It is not possible for shuttles according to the prior art to hold the thread loop for more than 1 revolution, so that a rotary loop stitch shuttle is required in addition to the rotary hook shuttle.
  • the thread loop held by the loop stitch shuttle is expanded and reduced at the time desirable for loop stitch formation so that the loop stitches are smoothly formed.
  • Another object of the invention is to produce loop stitches by utilizing a standard rotary hook shuttle, which normally is used for permanent stitches.
  • the shuttle itself must be exchanged, requiring special shuttles which are expensive to manufacture.
  • a relatively small loop stitch shuttle is mounted on parts which are necessary for supporting a bobbin during the making of permanent stitches with upper and lower threads.
  • the small loop stitch shuttle of the invention can be manufactured at low cost, and can be easily stored as a spare part or attachment for the machine.
  • the machine can be easily adapted to loop stitching by attaching the loop stitch shuttle of the invention to the rotary hook shuttle.
  • Another object of the invention is to lightly tighten the loops in the material which are already released by the loop stitch shuttle.
  • the tightening or fastening of stitches is generally carried out by the oscillatory thread guiding arm which takes the thread from tensioning means and supplies it to the needle.
  • the fastening of loops by this arm causes frictional resistance of the thread in the needle hole of the needle plate, in the needle eye, and in the eye of the oscillatory thread guide arm.
  • the loop stitching where the stitches are constructed of a single thread, the loop is fastened while sliding through the fabric or cloth so that the thread is subjected to higher frictional resistance than in permanent stitching.
  • the fastening or tightening of the proceeding loop is carried out while the new loop caught by the rotary hook shuttle is held by the loop stitch shuttle, While the amount of needle thread supplied by the oscillatory thread guide arm is limited by a pin or thread guide. If necessary, the supply of the upper thread from the oscillatory thread guide arm is controlled by increasing the tension of the thread tensioning means so that the old loop is tightened after release by the shuttle. This reduces the stretch of the thread portion forming the preceding loop to a short distance so that a lightly tightened loop stitch is produced.
  • Another object of the invention is to supply different amounts of upper thread to the loop stitch shuttle, as compared with the amount supplied for the making of permanent stitches by a standard shuttle, which is due to the fact that thread requirements are different during loop stitching and permanent stitching with two threads. Insuflicient supply of upper thread may cause breakage of the thread, while excessive supply of thread will cause entwinement of the thread, repeated catching of the same thread loop, and the like.
  • the present invention provides a thread guide or control pin on the side of the oscillatory thread guide arm. The thread is guided from the tension regulating means over the thread supply control pin or guide, and to the eye of the needle.
  • the cooperation between the thread supply control pin or thread guide, the loop stitch shuttle, and the oscillatory thread guide arm or take-up lever achieves a supply of upper thread corresponding to the length of thread required.
  • the slackening of the upper thread is limited due to the mounting of the loop stitch shuttle in the rotary hook shuttle so that the loop stitch shuttle can be made very small.
  • Another object of the invention is to provide a loop stitch shuttle which can be easily manufactured.
  • the loop stitch shuttle is very small, and is mounted on a standard rotary hook shuttle Without any adaptations or changes.
  • the small loop stitch shuttle can be made of sheet metal which is bent and soldered or welded to a cylindrical hub so that the loop stitch shuttle can be inexpensively manufactured.
  • Another object of the invention is to properly fasten and lightly tighten the loop stitches.
  • the thread of the respective preceding thread loop is used for expanding a newly formed thread loop. Especially after a needle eye has been placed in the cloth layer for constructing a new thread loop, it is almost impossible to supply thread through the fabric to the preceding loop since the thread passes in several bends through the cloth.
  • the thread loop is transferred to the loop stitch shuttle so as to cause no substantial change in the required amount of upper thread especially at the stage in which the needle has penetrated the cloth for forming a new thread loop. This permits to accomplish loop stitching in properly slightly tightened condition.
  • FIG. 1 is a front view illustrating a sewing machine provided with a loop stitch shuttle according to the invention
  • FIG. 2 is a side view of the loop stitch shuttle according to a preferred embodiment
  • FIG. 3 is a side view of the loop stitch shuttle of FIG. 2 as viewed from the other side;
  • FIG. 4 is a perspective view of the loop stitch shuttle
  • FIG. 5 is a diagram illustrating the amount of upper thread supplied to the shuttle, the amount of upper thread required by the shuttle, the amount of upper thread required when the loop stitch shuttle according to the invention is attached to the rotary hook, and the amount of upper thread required in the event that a control pin or thread guide is used in combination with the loop stitch shuttle;
  • FIG. 6 includes fourteen views, FIGS. 6A to FIG. 6N, which are front views illustrating successive positions of 4 of a base plate 17 which extends diametrically to hub portion 16 which is secured to shaft 7 in a predetermined angular position of base plate 17 by a screw 23.
  • Base plate 17 ends at one end in a transversely projecting engaging portion 12 which is also connected with one end of the curved slanted guide member 9 which has an upper edge 9' and a lower edge 9".
  • the upper edge of base plate 17 is formed with a pressing projection 11.
  • the ends of guide member 10 are curved toward hub portion 16, and guide member 10 has anchoring portions 18 and 19 projecting in axial direction, guide portion 19 merging with the edge of base plate 17.
  • the end portion of the slanted guide member 9 is adapted to project into the rotary hook 1 beyond the front edge 21 so as to project into the slot into which the needle passes to permit catching of the thread by the catching portion 4 of rotary hook 1.
  • the edge 9" receives and guides the thread portion R coming from the cloth and being guided by the front edge 21 of the rotary hook 1 while the thread loop is expanded.
  • the other edge 9' of guide member 9 guides the needle thread drawn through the needle eye by catching portion 4 during the rotation of book 1.
  • the slanted guide member 10 is inclined away from front edge 21 of rotary hook 1 so that only anchoring portion 18 projects into the rotary hook 1 beyond the front edge 21.
  • Guide member 10 first receives thread drawn by catching portions 4 of rotary hook I so as to anchor the thread on the surface of the guide member 10 and on anchoring portion 18. Front edge 10' of guide member 10 receives needle thread pushed toward base portion 17 by front edge 9 during continued rotation, and pushes the thread further forward.
  • Front edges 9 and 10' of the guide members 9 and 10 form continuations of the same helix or spiral so that thread loops received by the same are subsequently pushed forward without slipping off irrespective of the high rotary speed of the rotary hook and the loop stitch shuttle, until released by pressing projection 11 at the end of the helical edge 10, as will be explained hereinafter.
  • base plate 17 extends substantially at right angles to a radius passing through the the needle, rotary hook, and loop stitch shuttle during 7 the formation of a loop stitch;
  • FIG. 7 is a sectional view illustrating cloth with a row of loop stitches.
  • a sewing machine has a spool supporting pin 54.
  • the thread T is guided from the spool through a thread guide and passes through a conventional tensioning device 56 from where the thread passes through a thread guide 59 and the eye of an oscillatory thread guiding arm 57, another thread guide, and the eye of the needle 2.
  • a rotary hook 1 has a thread catching portion 4, see also FIG. 6.
  • a bobbin may be mounted in the rotary hook 1 to supply a shuttle thread which is connected with the needle thread to form stitches.
  • Rotary hook 1 is mounted for rotation in an outer shuttle race 52 whose removable cover is held in position by arms 53.
  • a loop stitch shuttle 6 has a hub portion with a central bore receiving drive shaft 7 and serves the purpose of anchoring thread loops caught in cooperation with the loop catching portion 4, and more particularly for holding a thread loop after it has been released by the catching portion 4.
  • Loop stitch shuttle 6 has two substantially spiral shaped guide members 9 and 10 which serve for expanding or contracting thread loops and project from opposite sides axis of rotation and a catching portion 4 of the rotary hook 1.
  • Guide member 9 is located in the region of catching portion 4, and guide member 10 is positioned on the side of base plate 17 remote from catching portion 4. The relative positions are determined by placing hub portion 16 in proper angular relationship with shaft 7, and then securing hub portion 16 to shaft 7 by screw 23, see FIG. 3.
  • loop stitch shuttle 6 is combined with rotary hook I and exchangeably mounted on the shaft. It is also possible to provide another anchoring portion at the lower end of hub 16 and to engage such anchoring portion with a projecting portion provided on the inner face of rotary hook I so as to position the rotary hook in a selected angular position relative to the loop stitch shuttle.
  • thread guide 59 is located between the oscillatory thread guiding arm 57 and the tensioning means 56.
  • the thread is guided from the tensioning means 56 through thread guide 59 to the oscillatory arm 57. In this manner, the amount of thread delivered by the oscillatory arm 59 is influenced.
  • the thread tension produced by tensioning means 56 is differently adjusted as compared with regular stitching during sewing operations. For example, if the tension of the needle thread is 40 grams during regular sewing operations with permanent stitching, the tensioning means 56 is set to produce a thread tension of between and 200 grams during the formation of loop stitching in accordance with the invention. Consequently, a standard sewing machine can be used for making regular permanent stitches, or loop stitches which can be easily opened and serve for temporarily connecting two layers of cloth.
  • the regulation of the tension of the needle thread during loop stitching is not necessarily obtained by adjustment of tensioning means 56, but it is also possible to mount the thread guide 59 on another reciprocating arm moving relative to arm 57 and consequently influencing the tension of the needle thread.
  • FIG. 5 has an ordinate representing the movement of the oscillatory thread guide arm 57 from its upper dead center position, and an abscissa representing the angle of rotation of the main shaft.
  • the graph a--a represents the amount of needle thread required by the rotary hook for the stitches
  • graph bb represents the amount of thread delivered by oscillatory thread guiding arm 57.
  • the thread loop is caught, and after that, the required amount of thread corresponds to graph aaa.
  • the thread loop is engaged by the loop stitch shuttle and then released by the catching portion 4, as will be explained with reference to FIG. 6C.
  • the thread loop is held while the main shaft completes its first revolution and turns 220 of the next following revolution, so that the amount of thread required by the shuttle is represented by the graph portion a-a.
  • the amount of needle thread originally supplied by the oscillatory thread guide arm 57 is represented by the graph b-b-b, the dead center position of the thread guide arm 57 being reached when the shaft has substantially turned 290. Due to the provision of the thread guide 59, the amount of needle thread supplied in the lower dead center position of thread guide arm 57 is reduced between the angular positions 170 to 360 of the main shaft, so that the supplied thread is represented by the graph portion b'b instead of by the peak of graph bb--b.
  • FIG. 6 has fourteen views FIG. 6A to FIG. 6N representing successive operational positions of the shuttle and needle during loop stitching.
  • the degrees of annular turning of the main shaft are indicated in each view so that the views can be respectively associated with corresponding portions or" the graphs of FIG. 5.
  • FIG. 6A at an angle of the main shaft of 230 in relation to an initial position, the needle loop has just been caught by catching portion 4 of the rotary hook 1, which happened at an angle of 210, as represented by a pointed portion of graph a in FIG. 5.
  • Catching portion 4 engages thread loop R on one side of needle 2 which has begun to move upward.
  • FIG. 6B at 260 shows the rotary hook further turned and loop R expanded, while the guiding members 9 and 10 of the loop stitch shuttle are still inoperative.
  • loop -R is further expanded and the front portion R of loop R slides along the front edge 21 of the rotary hook 1.
  • Guide member 9 of the loop stitch shuttle 6 has no effect on the thread, but anchoring portion 18 of guide member 10 projects into the rotary hook '1 and catches the front loop portion R just before the position of FIG. 6C is assumed so that the thread loop R is expanded transversely and loop portion R is bent to an angular shape so that loop portion R and R are no longer parallel as in the position of FIG. 6B.
  • loop R is no longer held by catching portion 4 of the rotary hook 1 so that loop portion R slides on the back of the rotary hook 1.
  • FIG. 6F at shows the position in which the cloth thread R' has been pushed forward by the slanted end portion of guide member 9.
  • Base plate 17 is substantially parallel to the needle plate of the machine table so that cloth thread R' and needle thread R' are spread apart at a maximum angle. In this position, needle 2 is about to move downwardly into the expanded loop R.
  • FIG. 6G shows the position at an angle of rotation of the main shaft of 160.
  • Base plate 17 of loop stitch shuttle 6 has turned more than 90 since the loop stitch shuttle 6 rotates at twice the speed of the main shaft, which has turned 50.
  • base plate 17 is located substantially in a vertical plane passing through needle 2.
  • Cloth thread R is pushed forward sufficiently by front edge 9' of guide member 9 to be transferred to the other guide member 10 while being continuously pushed forward by the spiral shape or helical slant of front edge 10" of guide member 10 so that cloth thread R, is now positioned in the region of pressing projection 11 of base plate 17, but not yet engaged by the same.
  • FIG. 6H shows the position at an angle of 210 in which needle 2 is again rising.
  • FIG. 6 shows the position after the main shaft has further turned 5, and the shuttle Base plate 17 of loop stitch shuttle 6 is slanted substantially at an angle of 45 or more relative to the needle plate so that thread loop R slips off pressing projection 11, which is best seen in FIGS. 2 to 4.
  • FIG. 5 shows the new thread loop R which was caught at 225, as represented by pointed portion of graph a, has been expanded by catching portion 4. No thread has been supplied to the oscillating guide arm 57 so that the old loop R is reduced.
  • FIG. 6L shows the engagement of the forward loop portion by guide member 9 of the loop stitch shuttle 6, corresponding to the position shown in FIG. 6C in which the front loop portion is held by guide member 10 since the shuttle has turned only 180 during the turning of the main shaft of 360.
  • FIG. 6M At of the third revolution of the main shaft, the position of FIG. 6M is assumed by the shuttle in which the front loop portion R is spread between pressing projection 11 and anchoring portion 18 of guide member 9, whereupon in the position of FIG. 6N the loop is further transformed, while the old loop R is fully tightened in the stitched cloth.
  • the upper dead center position of needle 2 is generally phase shifted relative to the upper dead center position of the oscillatory thread guide arm 57 an angle which corresponds to a 70 rotation of the main shaft. Due to this fact, the final fastening and tightening of the stitch is accomplished by the operation of the oscillatory thread guide arm 57.
  • a skipped stitch has quite a different effect in loop stitching than in permanent stitching. While in permanent stitching, a skipped stitch is faulty, a skipped stitch must be completely prevented in a row of loop stitches, since the entire seam would open.
  • thread loop R while anchored on the loop stitch shuttle 6, is fully expanded by the base plate 7 so as to cause the cloth thread R and the needle thread R' to make a sufficiently wide angle for permitting downward movement of needle 2, as shown in FIG. 6F.
  • the descending needle moves completely between the spread threads R' and R and cannot produce a skipped stitch.
  • the amount of needle thread required for the loop stitch shuttle 6 remains substantially the same in the angular positions 340, 360, 220, and needle 2 substantially completes the steps shown in FIGS. 6F, 6G, 6H, and 61 resulting in properly fastened loop stitches.
  • the loop stitch shuttle 6 is detachable from the shaft 7 of the bobbin so that one rotary hook can be used for permanent stitches and for loop stitches.
  • loop stitch shuttle '6 can be permanently combined with rotary hook 1.
  • base plate 17 and guide members 9 and 10 are portions of the rotary hook. Since the guide members can be constructed without consideration regarding a standard rotary hook, the shape of the guide portions may be modified. In such a modified construction, only the rotary hook with the guide members has to be exchanged for standard rotary hook when permanent stitching is desired, instead of the exchange of the loop stitch shuttle 6 in the above-described preferred embodiment of the invention.
  • the thread guide 59 adjacent the thread guide arm 57 may be omitted.
  • the oscillatory thread guide arm 57 draws amounts of thread similar to the representation of the graph bb-b in FIG. 5. This requires an eX- tension of the time for releasing the thread loop by the loop stitch shuttle 6 from 220 to 330 rotation of the main shaft, as shown in dash and dot lines c in FIG. 5. In this position, the amount of needle thread required by the rotary hook is a maximum.
  • the amount of thread supplied by the oscillatory thread guide arm 57 is gradually reduced from its maximum as required for the tightening operation by which the old loop released by loop stitch shuttle 6 is tightened, the increased resist ance at the time of tightening being a mere inconvenience.
  • the increase of the time during which the thread loop is held by the loop stitch shuttle 6 can be easily obtained by correspondingly designing the guide members 9 and 10 and the projections of the same.
  • a loop stitch shuttle arrangement comprising a rotary hook means for catching a needle thread, forming a loop of the same, and releasing the loop in successive angular positions, said rotary hook means having a bobbin mounting means; and a loop stitch shuttle detachably connected to said bobbin mounting means for engaging the formed loop, said loop stitch shuttle including anchoring guide means rotatable therewith and having successive angular positions for anchoring and holding the released loop in spread condition during rotation of said rotary hook means and movement of said needle into said anchored loop, and for releasing said loop when said rotary hook means again catches the needle thread to form a new loop.
  • a loop stitch shuttle arrangement comprising a rotary hook means for catching a needle thread, forming a loop of the same, and releasing the loop in successive angular positions, said rotary hook means having a bobbin mounting means; and a loop stitch shuttle detachably connected to said bobbin mounting means for rotation therewith, and including anchoring guide means composed of a base plate and a pair of slanted spiral shaped guide members projecting from the ends of said base plate and located on opposite sides of the same "and having during rotation of said loop stitch shuttle successive angular positions for anchoring the released loop during rotation of said hook means and movement of said needle into said anchored loop, and for releasing said loop when said rotary hook means again catches the needle thread to form a new loop.
  • a loop stitch shuttle arrangement as claimed in claim 5 comprising an oscillatory thread guide arm for supplying thread to said needle, tensioning means for tensioning the thread, and a thread guide adjacent said thread guide arm in the highest position of the same and guiding thread from said tensioning means to said thread guide arm.
  • a loop stitch shuttle arrangement comprising a rotary hook means for catching a needle thread, forming a loop of the same, and releasing the loop in successive angular positions, said rotary hook means having a bobbin mounting means; and a loop stitch shuttle detachably connected to said bobbin receiving means for rotation therewith about an axis of rotation, and including two arcuate guide members disposed on opposite sides of said axis and having guide edges located along a helical line, one of said guide members having two spaced axially projecting anchoring portions for anchoring said loop during rotation of said hook means and loop stitch shuttle, and for releasing said loop when said hook means again catches the needle thread to form a new loop.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
US644696A 1966-06-09 1967-06-08 Loop stitch shuttle for sewing machines Expired - Lifetime US3447498A (en)

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Application Number Priority Date Filing Date Title
JP3680166 1966-06-09
JP4479166 1966-07-11

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US3447498A true US3447498A (en) 1969-06-03

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US644696A Expired - Lifetime US3447498A (en) 1966-06-09 1967-06-08 Loop stitch shuttle for sewing machines
US811074A Expired - Lifetime US3540390A (en) 1966-06-09 1969-03-27 Loop stitch shuttle arrangement

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US811074A Expired - Lifetime US3540390A (en) 1966-06-09 1969-03-27 Loop stitch shuttle arrangement

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GB (1) GB1121608A (enrdf_load_stackoverflow)
SE (1) SE323864B (enrdf_load_stackoverflow)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3625169A (en) * 1969-09-01 1971-12-07 Brothers Kogyo Kk Chain-stitch-forming device for lock-stitch sewing machines
US3811392A (en) * 1971-10-20 1974-05-21 Janome Sewing Machine Co Ltd Double chain stitching method and device for sewing machine
US5381745A (en) * 1991-10-28 1995-01-17 Union Special Gmbh Method of sewing a seam and a sewing unit therefor
WO1996016219A1 (en) * 1994-11-23 1996-05-30 Zarif Sharifovich Tadzhibaev 'zarif' double-thread chain-stitch sewing machine
US5887533A (en) * 1995-10-09 1999-03-30 Juki Corporation Chain-stitch sewing machine with knot tying
US20090007830A1 (en) * 2006-02-03 2009-01-08 Suzuki Manufacturing, Ltd. Method and Sewing Machine for Forming Single-Thread Locked Handstitches
US20160032507A1 (en) * 2014-08-04 2016-02-04 Toyoda Gosei Co., Ltd. Stitch line forming method

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5244258B2 (enrdf_load_stackoverflow) * 1971-09-25 1977-11-07
US4108095A (en) * 1975-12-20 1978-08-22 Maruzen Sewing Machine Co., Ltd. Rotary loop taker for sewing machine
JP6389393B2 (ja) * 2014-08-05 2018-09-12 蛇の目ミシン工業株式会社 ミシン

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US33439A (en) * 1861-10-08 Improvement in sewing-machines
US1570667A (en) * 1922-01-14 1926-01-26 Singer Mfg Co Sewing-machine loop taker
US2860591A (en) * 1954-07-22 1958-11-18 Singer Mfg Co Loop-takers for sewing machines
US3028823A (en) * 1960-07-18 1962-04-10 O-Ocho Katsuyasu Oscillating chain stitch looper

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US33439A (en) * 1861-10-08 Improvement in sewing-machines
US1570667A (en) * 1922-01-14 1926-01-26 Singer Mfg Co Sewing-machine loop taker
US2860591A (en) * 1954-07-22 1958-11-18 Singer Mfg Co Loop-takers for sewing machines
US3028823A (en) * 1960-07-18 1962-04-10 O-Ocho Katsuyasu Oscillating chain stitch looper

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3625169A (en) * 1969-09-01 1971-12-07 Brothers Kogyo Kk Chain-stitch-forming device for lock-stitch sewing machines
US3811392A (en) * 1971-10-20 1974-05-21 Janome Sewing Machine Co Ltd Double chain stitching method and device for sewing machine
US5381745A (en) * 1991-10-28 1995-01-17 Union Special Gmbh Method of sewing a seam and a sewing unit therefor
WO1996016219A1 (en) * 1994-11-23 1996-05-30 Zarif Sharifovich Tadzhibaev 'zarif' double-thread chain-stitch sewing machine
CN1046771C (zh) * 1994-11-23 1999-11-24 塔巴耶夫·扎里夫·沙里弗维奇 双链式线迹缝纫机
US5887533A (en) * 1995-10-09 1999-03-30 Juki Corporation Chain-stitch sewing machine with knot tying
US20090007830A1 (en) * 2006-02-03 2009-01-08 Suzuki Manufacturing, Ltd. Method and Sewing Machine for Forming Single-Thread Locked Handstitches
US7891307B2 (en) * 2006-02-03 2011-02-22 Suzuki Manufacturing, Ltd. Method and sewing machine for forming single-thread locked handstitches
US20160032507A1 (en) * 2014-08-04 2016-02-04 Toyoda Gosei Co., Ltd. Stitch line forming method
US9879366B2 (en) * 2014-08-04 2018-01-30 Toyoda Gosei Co., Ltd. Stitch line forming method

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SE323864B (enrdf_load_stackoverflow) 1970-05-11
GB1121608A (en) 1968-07-31
US3540390A (en) 1970-11-17

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