US3118405A - Schenkengel - Google Patents

Schenkengel Download PDF

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Publication number
US3118405A
US3118405A US3118405DA US3118405A US 3118405 A US3118405 A US 3118405A US 3118405D A US3118405D A US 3118405DA US 3118405 A US3118405 A US 3118405A
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United States
Prior art keywords
plate
thread
needle
stitching
slide
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Expired - Lifetime
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English (en)
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    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B65/00—Devices for severing the needle or lower thread
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B73/00—Casings
    • D05B73/04—Lower casings
    • D05B73/12—Slides; Needle plates

Definitions

  • the present invention relates to a thread cutting device for sewing and the like machines, more particularly to improved means for cutting the upper or needle thread and the lower or looper thread of a lockstitch sewing machine upon the completion of a sewing operation.
  • a device of this type for effectively and expeditiously cutting or severing the needle and looper threads of a lockstitch sewing machine at a point close to and without displacement of the work being operated on and at a relative position of said threads subsequent to release of the needle thread loop by the loop taker of the machine.
  • a more specific object of the present invention is the provision of improved thread cutting means structurally embodied in a lockstitch sewing machine by which the above and related difiiculties and drawbacks are substantially overcome and which may be operated easily and expeditiously, substantially without requiring any special skill, while ensuring a uniform and eicient cutting or severing of the threads of the machine upon the termination of a sewing operation.
  • Another object of the invention is the provision of a thread cutting device of the above type which is both simple in construction and which may be readily structurally embodied in conventional lockstitch sewing machines without requiring essential changes of the construction of the machines.
  • Yet another object of the invention is the provision of a needle and loop taker thread cutting device of the type referred to being structurally embodied in a lockstitch sewing machine and which will result in the free or cut ends of the threads having a uniform and minimum length adequate for the commencement of a subsequent stitching operation by the machine.
  • FIG. l is a perspective View of a conventional lockstitch sewing machine having embodied therein thread Patented Jan. 2l, 1964 ICC cutting mechanism constructed according to the principles of the invention
  • FIG. 2 is a partial view on an enlarged scale showing in greater detail the construction of the thread cutter forming part of FIG. l, the cutting device being shown in the operative or extended position;
  • FIG. 3 is a partial sectional view on a still greater scale, taken on line III- III of FIG. 2 and showing the cutting device in the inoperative or retracted position;
  • FIG. 4 is a view similar to FIG. 3 with the cutting device being shown in the operative or extended position;
  • FIG. 5 is a further and enlarged partial perspective view of FIG. l, showing the head of the sewing machine and the thread cutter in the retracted or inoperative position.
  • the invention involves generally the provision of improved thread cutting mechanism for lockstitch sewing machines, whereby the upper or needle thread, in its position subsequent to its release by the loop taker is situated as to form a loop below the stitching plate, or before passing the stitching opening therein and after stoppage of the machine and lifting of the work presser foot, is locked at a point between the needle thread take-up lever and the needle, such as by clamping the thread simultaneously with the raising of the presser foot against the head or housing of the machine, whereupon after pulling oi a maximum of thread supply from the upper thread tension device, a slide having a cutting edge and mounted upon the stitching plate of the machine is operated together with the work overlying the same in a direction opposite to the work feeding direction against and into operative position with the edge of a fixed cutting knife, in such a manner as to extract the looper thread and to cut or sever the needle thread loop and the extracted looper thread at a point close to the undersurface of the work or sewing material being operated on.
  • the severing of the upper and lower threads, in a lockstitch sewing machine is greatly simplied and improved by the device and method of the invention, primarily by reason of the fact that the cutting or severing of the threads is effected without lifting or displacing the work during trie cutting operation.
  • the thread cutter slide is provided with a lateral extension of adequate size and provided with a gripping hole or recess, whereby by engagement of said hole and in turn of the work or sewing material overlying the saine by the finger of the operator, the work will be displaced together with and in the same direction as the cutter, in such a manner as to extract an adequate amount of the lower or looper thread required for and to facilitate the thread cutting operation.
  • the slide and its extension advantageously have an upper surface being flush with the surface of the work or stitching plate of the machine, to avoid any projecting parts interfering with the operation of the machine, while enabling a safe and positive gripping and movement of both said slide and the work during a thread cutting or severing operation, as will become further apparent as the following description proceeds.
  • FIG. 1 there is shown a sewing machine comprising a needle 1 attached to a reciprocating needle bar 2, a work presser foot bar 3 carrying a Work presser foot rl, an oscillating take-up lever 5 for the upper or needle thread S', a thread tension device 6, a hand wheel 7 and a looper or loop taker 8, all of conventional construction and arranged for operation by suitable drive and actuating means mounted within the housing 9 and underneath the worktable or cloth plate 11 of the machine and omitted in the ydrawing for simplicity of illustration and as being unnecessary for the understanding of the present invention. Furthermore, means are provided to release the upper thread tension produced by the device upon raising of the presser foot 4 by means of the presser foot actuating lever 10 mounted in the head of the machine, in a manner well known in the design and operation of conventional sewing machines.
  • a work or stitching plate 12 which, in addition to the usual recesses or slots 13, FIG. 2, to accommodate the work feeding dogs (not shown), is provided with a dove-tailed slot or recess 14 forming a guide for a first slide or actuating plate 15 being ush with the upper surface of the stitching plate 12 and movable outwardly or opposite to the work feeding direction, as understood from the drawing.
  • the slide 15 is provided with a stitching opening 16 for passing the needle i which opening in the inoperative or retracted position of the slide, FIG. 3, is in register with the main stitching opening 17 in the plate 12.
  • a knife or cutting blade 20 mounted to the further bridge or connecting member 22 of said plate at the opposite end of the slot 19 by means of a screw 21 or by any other securing means.
  • the cutting edge 23 ot the knife blade 22 is arranged to project into the pati of a further cutting edge 24 provided upon the undersurface of the slide 15 and located normally behind the stitching opening 16 in respect to the movement of said slide,
  • a guide 25 of the knife 22 disposed laterally oi the cutting edge 23 is slightly bent in the downward direction to resiliently engage the bridge or connecting member 1S as shown in FIG. 3.
  • a further slide or plate 26, FIG. 2 Mounted at a point adjacent to the stitching plate and displaceaole along the lengthwise axis of the sewing machine is a further slide or plate 26, FIG. 2, being provided with a slot or recess 27 wherein is mounted a further actuating slide or plate 28 displaceable in a direction transverse to plate 26 or parallel to the main slide or cutter actuating plate 15.
  • Slide 28 has an angular extension 29 which in the retracted position of the knife or cutter occupies a depression 3G of the base plate 26 and a depression 31 of the stitching plate 12, whereby all the elements are flush with each other and the upper surface of plate 12 and projecting parts liable to interfere with the sewing operation are avoided.
  • Extension 29 has a nose or projection 32 engaging a recess of the slide 15.
  • the actuating slide 2S In order to manually operate the actuating slide 2S, the latter is provided with a digital gripping opening or recess 34 and a pair of tension coil springs 35 are connected between the plate 26, on the one hand, and the slide 28, on the other hand, in such a manner as to normally urge the slide 28 and with it the main actuating slide 15 to the retracted or inoperative position within the stitching plate 12, as shown in FIG. 5.
  • a support or holder 36 which with the presser foot being operated to its raised position serves to clamp the upper or needle thread 5 against the head or housing 9 of the sewing machine.
  • An index or adjusting mark 33 upon the housing and disposed next to the thread take-up lever 5 serves to indicate the position of the latter corresponding to the position of the stitch forming tools at which the upper thread after release by the looper 8 still forms a small loop underneath the stitching plate 12 as shown in FIG. 3.
  • the hand wheel l is rotated manually to a position such that the thread take-up lever 5 is opposite to the index mark 38, as shown in FIG. 5.
  • the needle thread has been released by the looper 8 and still forms a small loop underneath the stitching plate 12 or has not yet passed the stitching openings 16 and 17, shown in FIG. 3.
  • Operation of the presser foot lever 10 to move the presser foot to the raised position then causes the upper thread to be clamped by the frame 37 against the underside ot the head of the housing 9, while at the same time releasing the upper thread tension 6 in a manner customary with conventional sewing machines.
  • T he hand wheel 7 may then be rotated to a position corrcspending to the upper dead center point of the thread take-up lever 5, PIG. 1, whereby to result in the feeding of an adequate length of the upper or needle thread.
  • Cutting of the threads may then be effected by manually extending the slide 28 outwardly from the plate 12 as shown in FiG. 2 by digital engagement of the hole or recess 34, whereby the work or sewing material overlying said slide will be clamped against the edge of said holc, in such a manner as to displace the work together with and in the direction of the slide 28 and in turn of the slide or cutter operating member 15, as more clearly shown in FIG. 4.
  • the inside wall of the stitching opening 16 acts to exert a pull on the tensioned lower or looper thread which by passing over the bridge or connecting member 18 not only will be extracted from the looper bobbin but will additionall, assist in the displacement of the work in the operating direction of the slide 15.
  • the next to the last stitching point from which protrudes the lower thread is displaced in a direction towards the stitching opening 16 of the slide 15, whereby to effect a severing of the lower thread and of the upper thread loop by the cutting edges 23 and 24 at an approximate position of the work where the two last preceding stitching points are spaced equally from said stitching opening.
  • This will result in the cut ends of the threads remaining in the work to be of about the same length, on the one hand, and in the projecting ends of the threads left in the machine having a minimum length adequate for the commencement of a subsequent sewing operation.
  • thread cutting means comprising clamping means to lock said needle thread, a stitching plate mounted upon said cloth plate and having a recess extending to an outer edge thereof and a stitching opening in the bottom of said recess 'for passing said needle, a slide plate movable within said ecess, spring means to normally urge said slide plate to retracted position within said recess, said slide plate having a stitching opening in register with said first opening in the retracted position, index means in cooperative relation to a stitch-forming organ of said machine to indicate a predetermined position of said needle thread forming a loop below said stitching plate after release from said loop taker, a cutter blade secured to said stitching plate underneath said slide and
  • a work presser foot slidably mounted within said head, and means operably connecting said clamping means with said presser foot, to lock said needle thread in the raised position of said presser foot.
  • an oscillating needle thread take-up lever synchronized with said needle and said loop taker, said index means arranged upon said head for cooperation with said lever to indicate said predetermined position ot said needle thread.
  • a presser foot bar slidably mounted in said head and carrying a work presser foot at its lower end
  • said clamping means consisting of a resilient loop connected to said presser foot bar, to clamp said needle thread against said head in theraised position of said presser foot.
  • thread cutting means comprising clamping means to lock said needle thread against said head, a stitching plate mounted upon said cloth plate having a recess extending to an outer edge thereof and having a stitching opening in the bottom of said recess -for passing said needle, a slide plate within said recess ush with the upper surface of said stitching plate and movable between an operative and a fully retracted position within said recess, said slide plate having a stitching opening in register with said first opening in its retracted position, index means in cooperative relation to ya stitch-forming organ of said machine to indicate a predetermined position of said needle thread forming a loop below said stitching plate after release from said loop taker, a stationary cutting blade underneath said
  • an oscillating needle thread take-up lever synchronized with said needle and said 4looper and mounted upon said head, said index means arranged upon said head for cooperation with said lever to indicate said predetermined position of said needle thread.
  • a presser foot bar slidably mounted within said head and carrying a Iwork presser foot at its lower end, said clamping means consisting of a resilient frame connected to said bar, to clamp said needle thread against said hea-d in the raised position of said presser foot.
  • said stitching plate having a slot underneath said slide plate and extending to a position close to said rst stitching opening, to facilitate removal of the cut ott ends of said threads.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
US3118405D 1960-04-04 Schenkengel Expired - Lifetime US3118405A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEP24743A DE1104805B (de) 1960-04-04 1960-04-04 Verfahren zum Durchschneiden des Ober- und Unterfadens an Doppelsteppstich-Naehmaschinen und Einrichtung zur Durchfuehrung des Verfahrens

Publications (1)

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US3118405A true US3118405A (en) 1964-01-21

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US3118405D Expired - Lifetime US3118405A (en) 1960-04-04 Schenkengel

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US (1) US3118405A (zh)
BE (1) BE602016A (zh)
CH (1) CH382532A (zh)
DE (1) DE1104805B (zh)
GB (1) GB905820A (zh)
NL (1) NL262626A (zh)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3182620A (en) * 1963-09-03 1965-05-11 Wm G Leininger Knitting Co Surplus thread removing apparatus
US3413944A (en) * 1965-10-01 1968-12-03 American Safety Table Co Thread severing attachment for sewing machine
US3712256A (en) * 1970-05-29 1973-01-23 Pfaff Ind Masch Device on sewing machines for guiding the thread chain
US3783813A (en) * 1972-08-14 1974-01-08 Singer Co Underbed thread trimming device for sewing machines
US3810439A (en) * 1970-06-09 1974-05-14 M Giesselmann Arrangement for cutting the threads in a sewing machine when changing the bobbin thread
US5383416A (en) * 1991-11-08 1995-01-24 Saurer Sticksysteme Thread clamping and cutting apparatus for the rear or lower thread of an embroidering machine
CN108796854A (zh) * 2017-05-05 2018-11-13 杜尔克普-阿德勒股份公司 预定目标线缝突伸部的线缝端部底线的产生方法和缝纫机

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2283503B (en) * 1993-11-05 1997-02-05 James Thomas Lahiff Sewing apparatus
DE19531727C2 (de) * 1994-10-13 1999-09-30 Duerkopp Adler Ag Fadenabschneidvorrichtung für eine Nähmaschine

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US16713A (en) * 1857-03-03 Improvement in sewing-machines
US766715A (en) * 1904-02-08 1904-08-02 Robert L Lyons Thread-clamping device for sewing-machines.
US1013252A (en) * 1911-02-06 1912-01-02 Singer Mfg Co Thread-trimming mechanism for sewing-machines.
US1373227A (en) * 1917-01-15 1921-03-29 Singer Mfg Co Button-sewing machine
US1549248A (en) * 1921-01-07 1925-08-11 Singer Mfg Co Chain-stitch sewing machine
US2376417A (en) * 1944-06-13 1945-05-22 Chudner Joseph Thread cutter
US2420538A (en) * 1945-01-15 1947-05-13 White Sewing Machine Corp Take-up mechanism

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1037824B (de) * 1958-03-07 1958-08-28 Duerkoppwerke Ag Verfahren zum Annaehen eines Gegenstandes an einem Werkstueck und Ausbildung einer Naehmaschine zur Durchfuehrung des Verfahrens

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US16713A (en) * 1857-03-03 Improvement in sewing-machines
US766715A (en) * 1904-02-08 1904-08-02 Robert L Lyons Thread-clamping device for sewing-machines.
US1013252A (en) * 1911-02-06 1912-01-02 Singer Mfg Co Thread-trimming mechanism for sewing-machines.
US1373227A (en) * 1917-01-15 1921-03-29 Singer Mfg Co Button-sewing machine
US1549248A (en) * 1921-01-07 1925-08-11 Singer Mfg Co Chain-stitch sewing machine
US2376417A (en) * 1944-06-13 1945-05-22 Chudner Joseph Thread cutter
US2420538A (en) * 1945-01-15 1947-05-13 White Sewing Machine Corp Take-up mechanism

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3182620A (en) * 1963-09-03 1965-05-11 Wm G Leininger Knitting Co Surplus thread removing apparatus
US3413944A (en) * 1965-10-01 1968-12-03 American Safety Table Co Thread severing attachment for sewing machine
US3712256A (en) * 1970-05-29 1973-01-23 Pfaff Ind Masch Device on sewing machines for guiding the thread chain
US3810439A (en) * 1970-06-09 1974-05-14 M Giesselmann Arrangement for cutting the threads in a sewing machine when changing the bobbin thread
US3783813A (en) * 1972-08-14 1974-01-08 Singer Co Underbed thread trimming device for sewing machines
US5383416A (en) * 1991-11-08 1995-01-24 Saurer Sticksysteme Thread clamping and cutting apparatus for the rear or lower thread of an embroidering machine
CN108796854A (zh) * 2017-05-05 2018-11-13 杜尔克普-阿德勒股份公司 预定目标线缝突伸部的线缝端部底线的产生方法和缝纫机
TWI775849B (zh) * 2017-05-05 2022-09-01 德商都寇帕鷹股份有限公司 具有目標線縫突伸部的線縫端部底線的產生方法和縫紉機

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Publication number Publication date
DE1104805B (de) 1961-04-13
CH382532A (de) 1964-09-30
BE602016A (fr) 1961-07-17
GB905820A (en) 1962-09-12
NL262626A (zh)

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