US2892428A - Loop-takers for sewing machines - Google Patents

Loop-takers for sewing machines Download PDF

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Publication number
US2892428A
US2892428A US490467A US49046755A US2892428A US 2892428 A US2892428 A US 2892428A US 490467 A US490467 A US 490467A US 49046755 A US49046755 A US 49046755A US 2892428 A US2892428 A US 2892428A
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US
United States
Prior art keywords
thread
bobbin
needle
carrier
hook
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US490467A
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English (en)
Inventor
Thaddeus J Zylbert
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Singer Co
Original Assignee
Singer Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Singer Co filed Critical Singer Co
Priority to US490467A priority Critical patent/US2892428A/en
Priority to GB2847/56A priority patent/GB790165A/en
Priority to DES47459A priority patent/DE1078418B/de
Priority to ES0226907A priority patent/ES226907A1/es
Priority to FR1152617D priority patent/FR1152617A/fr
Application granted granted Critical
Publication of US2892428A publication Critical patent/US2892428A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B57/00—Loop takers, e.g. loopers
    • D05B57/08—Loop takers, e.g. loopers for lock-stitch sewing machines
    • D05B57/10—Shuttles
    • D05B57/14—Shuttles with rotary hooks

Definitions

  • The. present invention relates to sewing machines and hasfor' a primary object toprovide a new and improved loopetaker' for sewing machines. It is a specific object of: this invention to provide means for precluding the formulation of so-called. hitch-stitches, which is defective sewing wherein the needle-thread is knotted about the bobbin-thread instead of merely looped about the same as in the formation of so-called perfect lock-stitches.
  • Fig; 1. isaa top plan view of a rotary hook, for a sewing machine embodying the present invention, the hook being illustratedper'se except for the, cooperating needles which are in section and the hook-shaft which is broken away, and the sewing threads are illustrated schematically to show the functional cooperation of the various elements of. the hook during sewing.
  • Fig. 2 is a front elevation view of the hook as illustratcd in Fig. l but also including a fragmentary portion in: elevation of the needles and afragmentary portionin section of the throat-plate andwork.
  • Figs. 3' and 4 areviews similar to Fig. 2but illustrating the. relationship of the stitching means and the'sewingthreads at'subsequent'points in the cycle of stitch formation and, for clarity, omitting'thedetailed showingof the bobbin-case.
  • Fig. 5 is: a diagrammatic view in: perspective of the threadrconcatenation in a seamformed by the hookand cooperating elements of. Fig. 1.
  • FIG. 6- is; aside elevation view of-the bobbin-case-carrier perse illustrated in Fig. 1.
  • Figs. 7, 8;, 9, 1.0and 11 are views corresponding respectively to- Figs. 1,, 2, 3, 4 and 5, but illustrating the prior art construction and thestitch formation thereof.
  • this device includes a cupshapedliook-body I mounted upon a rotating hook-shaft 2' and having a loop-seizing beak 3 formed integrally in the cylindrical side-wall of the hook-body adjacent the gap .at the discontinuous portion therein.
  • the side-Wall of thel'hook body is formed with an internal raceway'in which is journaled the peripheral bearing rib 4 of a bobbin-case-carrier 5 that carries a bobbin-case 6 and a bobbin-7, the usual bobbin-threadtension spring 6 being secured to the periphery of the bobbin-case 6.
  • the bobbin-case-carrier 5 In the usual-fashion during operation the bobbin-case-carrier 5 is held stationary whilethe hook-body 1 is rotated thereabout;
  • the bearing rib 4 is discontinuous to provide a loop-detaining shoulder 8 and a loop-confining shoulder 9.
  • the raceway in the hook-body 1 includes an opensided portion.
  • a plate 12 is also secured to the periphery of the hookbody, the plate 12' having a needle-thread deflecting beak 13 at one end which extends into the gap in the side-wall of the hook-body adjacent to but spaced from the loopseizing beak 3, and a bobbin-thread pull-off flange 14.
  • the hook is designed to cooperate with a pair of needles including a left-hand needle 15 and a right-hand needle 16, which needles are reciprocableto a position in which they extend downwardly through the work W and the throat-plate 17 of the machine into cooperation, with the hook.
  • each needle penetrates the work and then, as it iswithdrawn, throws a loop of thread which is seized by the beak 3 of the hook-body, 1, expanded, cast about the lower thread mass WhlChlS wound upon the bobbin 7, and then with drawn.
  • the bobbin-thread is designated 18, the needle-thread ofthe left-hand needle 15 is designated;1-9' and'the needle-thread of the right-hand needle 16 is designated 20.
  • the illustrated, rotary hook is designed for use inv a sewing machine; such as disclosed, for example, in the Eames patent, No. 2,024,434, i.e., it is designed to be arranged on a horizontal axis transversely of the bed of the machine or, what is the same thing, parallel to the line of. feed or the line of stitch or seam formation, whereby it may cooperate with a laterally vibrating or, as more commonly called, a zigzag needle.
  • thehook rotates counterclockwise in the direc tion of the arrow A, and, as seen in Fig. 7, the direction of feed of the work is to the rear axially of the hook as designated-by the arrow B.
  • Patent No. 2,722,904 dated Nov. 8, 1955. For pur-.
  • hitch-stitches as, distinguished from, perfect lock-stitches, in the use of-a twin-needle.
  • the loop-seizing beak passes to the rear of 3 the needle 16, as seen in Fig. 8, or on the short groove side of the needle, and is travelling counterclockwise. In Fig. 8, the point in the stitching cycle that is illustrated is shortly beyond loop seizure.
  • the supply limb of the thread 20 extends from the supply through the thread handling devices of the machine down the needle, through the eye thereof and beneath the loop-seizing beak of the hook in front of the loop-detaining shoulder 8.
  • the worklimb of the thread extends from beneath the loop-seizing beak 3 of the hook around the rear edge of the beak, forwardly in the slot between the beak 3 and the beak 13 of the plate 12 and then upwardly through the needlehole in the throat-plate 17 to the previous stitch in the work W.
  • the loop in the thread 20 is completely behind the lead of the bobbin thread 18 to the work W.
  • the loop of needle-thread is pulled back on the beak 3 and thereby expanded. That portion of the thread on the underside of the beak 3 is caught on the loop-detaining shoulder 8.
  • the supply limb of the thread extends from the supply through the work, rearwardly on the periphery of the bobbin-case-carrier to the slot between the beak 3 of the hook and the beak 13 of the plate 12.
  • the work-limb of the thread extends from this slot upwardly to the last stitch set in the work.
  • the supply-limb and the work-limb of the thread lie on the periphery of the bobbin-case-carrier 5.
  • the two limbs slide from the periphery of the bobbin-case-carrier and start sliding laterally relative to the hook, the work-limb sliding across the face of the carrier 5 and the bobbin-case 6 and the supplylimb sliding across the rear of the carrier 5 or between the rear of the carrier 5 and the bottom of the hook-body 1.
  • the thread 20 has formed with relation to the bobbin thread 18, a lock-stitch, i.e., the work limb of the thread leads down from the previous stitch in the work, around the bobbin-thread, and into the supply limb of the thread which leads upwardly to the supply.
  • a lock-stitch i.e., the work limb of the thread leads down from the previous stitch in the work, around the bobbin-thread, and into the supply limb of the thread which leads upwardly to the supply.
  • the completed stitch is illustrated in Figs. 7 and 11.
  • the stitch forming cycle is exactly the same as with the needle 16 and thread 20 except for the lead of the bobbin-thread 18 with relation to the needle.
  • the bobbin-thread which is concatenated with both needles-threads, lies on the underside of the work along a line that is between the two lines defined by the needle-threads 19 and 20.
  • the lead of the bobbin-thread is from the bobbin-thread tension 6 over the face of the bobbin-case-carrier 5 and upwardly and rearwardly to the last stitch in the work.
  • the right-hand needle 16 descends to the right of the lead of bobbin-thread from the bobbin 7 to the last stitch in the work and, as above pointed out, this produces a lock-stitch.
  • the left-hand needle 15 descends to the left of the bobbin-thread lead and, by following the thread 19in Figs.
  • Figs. 1-6 in which the variouselements of the device are designated by the same reference numerals as the corresponding elements of the device as disclosed in Figs. 7-11.
  • a slot 21 in the cylindrical side-wall cf the bobbin-case-carrier 5 as can be seen in Fig. 6.
  • the slot 21 opens at the edge 22 defined by the usual gap in the side-wall of the carrier 5 that is provided to accommodate the bobbin-thread tension spring 6 and its-securing means, the other edge of the gap being designated 23.
  • the slot 21 extends into the side-wall of'the carrier 5 from the edge 22 from a point adjacent the bearing rib 4 and in a direction diverging with relation to the bearing rib.
  • the slot 21 terminates. in what is termed a thread-delivery eye 24 disposed on. the. periphery of; the bobbin-case-carrier at a. point on the cast-on sid'e thereof or, in. other words, beyond the path of. needle reciprocation. in, the direction of rotation. of said hook and to laterally ofv a notch 25' which notch. 25 is theusual rotation-restraining notch designed to receive arotation-rest'raining finger (not shown).
  • the mouth of the slot 21 is enlarged, as at 26.
  • Thebobbin-case-carrier 5 also includes the usual needle-thread .loop-controlling, flange 27 on the cast-off side thereof.
  • the bottom of the bobbin-casecarrier 5 isdesignat'ed- 28, and the top, which is hereinafter termed the free edge, is designated 29.
  • the thread-delivery eye 24 is disposed tojthe' left. of the path of reciprocation of the needles 15 and 16 at a point. on the periphery of the bobbin-case-carrier 5.
  • the bobbin-thread 18, as it emergestfromibeneath the end ofthe. tension spring 6 is di'rectedithrough the thread-delivery eye 24, the. threading of'which is facilitatedby 'the slot 21, and then runs to the'last'stitch set'irrthe work.
  • the thread directing means in accordance with this invention thus comprises a very simple expedient involvinginstead of added parts, only the thread-eye 24 in the side-wall of the bobbin-case-carrier.
  • the present-invention is also very efiicient in that thereis substantially nopossibilitythat the bobbin-thread may become misdirected in such a manner as to form hitch-stitches with the needle-thread 19 since the bobbimthread' is firmly controlled bythe threadeye 24.
  • the lead of the bobbinthread is very close to the path of motion of the bobbin-thread pull-off flange 14 so that there is a very sharp angle in the lead about the flange 14 to the work.
  • the lead of the bobbin-thread in the device of Figs. 7l0 is from a point spaced from the path of travel of the flange 14 which results in only a gentle angle in the lead of the bobbin-thread about the flange 14 toward the work.
  • Another advantage derived by the present invention is that the operation of the rotary hook embodying the same is snappy.
  • a rotary hook at cast-01f it is necessary that there be a minimum of looseness in the needle-thread or, in other words, that the thread be nicely snubbed about the hook elements, so that the thread will quickly move off the beak 3 of the hook onto the loop-controlling tail 11. If this action is sluggish as when there is looseness in the needle-thread, there is a tendency for the thread to become jammed between the bearing rib 4 and the raceway in the hook-body 1. A certain amount of control over this condition is exercised by the present device. In the hook of Figs.
  • the critical portion of the cycle insofar as transferring the loop from the beak 3 to the tail 11 is concerned occurs 'at'a po'iht almost diametrically opposite to the point of contact of. the needle and bobbin-threads.
  • the loop is pivoting about a diameterand' there is. consequently little thread given up at this portion of the. cycle and there is little loose thread in the system.
  • the needle-thread loop is, relatively speaking, snubbed about the hook beak 3 so that the loop will be snapped from the beak 3 to the tail I1.
  • a still further advantage ofthis invention is that the bobbin thread 20 emerges from the thread-eye 24 substantially tangentially to the bobbin-case 6 so that any pull exerted upon the bobbin-thread will tend to rotate the bobbin-carrier in a counterclockwise direction as seen in' Fig. 2;
  • the feeding mechanism of the machine isoperative at that portion of the cycle illustrated in Fig. 4 which thus-pulls the bobbin-thread and thereby: opens a gap between the notch 25 and the rotationrestraining finger topermit escape of the thread loop from the hook.
  • a reciprocatory needle adapted to be" actuated to defiine a path of needle reciprocation extending through said work-supporting surface and a rotary hook disposed upon the opposite side of said Work-supporting surface from said needle and adapted to cooperate with said needle in the formationof two-thread lock-stitches
  • said hook comprising a cup-shaped body having an internal circular raceway, a stationary bobbin-case-carrier having a cylindrical sidewall and a bearing rib on the periphery of said side-wall, said bobbin-case-carrier being mounted in said rotary hook with said bearing rib journaled in said raceway for rotation of said hook relatively to said bobbin-case-carrier, said bobbin-case-carrier being adapted to receive a bobbincase and a bobbin mounted therein, said bobbin-case having an aperture through which a bobbin-thread is adapted to emerge, and
  • said bobbin-case-carrier has an open-ended threading slot in the side-wall thereof extending inwardly from the free edge thereof and communicating with said thread-eye.
  • said bobbin-case-carrier having a needle clearance aperture in the side-wall thereof to provide for penetration of said side-wall by a reciprocatory sewing needle the operation of which defines a path of needle reciprocation relatively to said bobbincase-carrier, said bobbin-case-carrier having a thread-eye through said side-wall and opening on the periphery thereof at a point disposed substantially in a plane normal to the axis of said bobbin-case-carrier and through said needle clearance aperture and spaced angularly from said needle clearance aperture on the cast-on side of said bobbin-case-carrier for directing a bobbin-thread from said bobbin-case-carrier relatively to the path of needle reciprocation to prevent orientation of the bobbin-thread relatively to the path of needle reciprocation resulting in hitch-stitching.
  • a bobbin-case-carrier for a rotary hook of a sewing machine and for receiving a thread-carrying bobbin, said bobbin-case-carrier comprising a cylindrical side-wall, having a free front edge terminating on the cast-01f side of said bobbin-case-carrier in a loop-controlling flange, a bearing rib on the periphery of said side-Wall for mounting said bobbin-case-carrier within a rotary hook for rotation of the hook relatively thereto, said loopcontrolling flange having a notch therein for receiving a rotation-restraining means, said bobbin-case-carrier haviug a needle clearance aperture in the side-wall therefor rearwardly of said loop-controlling flange and adjacent to said rotation-restraining notch to provide for penetration of said side-wall by a reciprocatory sewing needle the operation of which defines a path of needle reciprocation relatively to said bobbin-case-carrier, said bobbincase-carrier having
  • a bobbin-case-carrier in accordance with claim 4 in which said sloop-controlling flange extends beyond said needle clearance aperture and said thread-eye onto the cast-on side of said bobbin-case-carrier, and said thread-eye is formed in said flange.
  • a bobbin-case-carrier in accordance with claim 4 in which said bobbin-case-carrier has an open-ended threading slot in the side-wall thereof extending inwardly from the free edge thereof and communicating with said thread-eye.
  • a sewing machine having a work-supporting surface, feeding mechanism for advancing work over said work-supporting surface and thereby defining a line of feed, and stitching mechanism including a pair of parallel reciprocatoory needles adapted to be actuated to define parallel paths of needle reciprocation extending through said work-supporting surface and a rotary hook disposed upon the opposite side of said work-supporting surface from said needles and arranged upon an axis parallel to said line of feed for cooperation with said needles in the formation of three-thread lock-stitches, said hook comprising a cup-shaped body having an internal raceway, a stationary bobbin-case-carrier having 'a cylindrical side, wall and a bearing rib on the periphery of said side-wall, said bobbin-case-carrier being mounted in said rotary hook with said bearing rib journaled in said raceway for rotation of said hook relatively to said bobbin-case-carrier, said bobbin-case-carrier being adapted to receive a bobbin-

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
  • Polymerisation Methods In General (AREA)
  • Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
US490467A 1955-02-25 1955-02-25 Loop-takers for sewing machines Expired - Lifetime US2892428A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US490467A US2892428A (en) 1955-02-25 1955-02-25 Loop-takers for sewing machines
GB2847/56A GB790165A (en) 1955-02-25 1956-01-30 Loop-taker for sewing machines
DES47459A DE1078418B (de) 1955-02-25 1956-02-11 Greifer fuer Naehmaschinen
ES0226907A ES226907A1 (es) 1955-02-25 1956-02-24 UN DISPOSITIVO TOMADOR DE BUCLES PARA UNA MáQUINA DE COSER EN ZIG-ZAG
FR1152617D FR1152617A (fr) 1955-02-25 1956-02-24 Preueur de boucle pour machines à coudre

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US490467A US2892428A (en) 1955-02-25 1955-02-25 Loop-takers for sewing machines

Publications (1)

Publication Number Publication Date
US2892428A true US2892428A (en) 1959-06-30

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US490467A Expired - Lifetime US2892428A (en) 1955-02-25 1955-02-25 Loop-takers for sewing machines

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US (1) US2892428A (de)
DE (1) DE1078418B (de)
ES (1) ES226907A1 (de)
FR (1) FR1152617A (de)
GB (1) GB790165A (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3033139A (en) * 1957-10-31 1962-05-08 Nippon Mishin Seizo Kabushiki Stitch forming mechanism of lock-stitch sewing machine for zigzag sewing
US3066624A (en) * 1959-06-09 1962-12-04 Sr Otto Jeppener Lock sittch machine with bobbin thread guide
US20050115480A1 (en) * 2003-12-01 2005-06-02 Ronald Kronenberger Bobbin case assembly with thread tensioning element and method of drawing thread from a thread supply
DE19523627B4 (de) * 1994-06-29 2005-12-22 Juki Corp., Chofu Spulengehäuseanordnung und Nähmaschine
ITPI20080063A1 (it) * 2008-07-16 2010-01-17 Ruffo Spa Metodo di cucitura a macchina di fili ad elevato spessore

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US572090A (en) * 1896-11-24 borton
US663674A (en) * 1900-08-07 1900-12-11 Singer Mfg Co Thread-case for sewing-machines.
US944740A (en) * 1905-12-01 1909-12-28 Willcox & Gibbs Sewing Machine Sewing-machine.
US1995278A (en) * 1934-05-12 1935-03-19 Singer Mfg Co Rotary hook and bobbin-case device for sewing machines
US2085699A (en) * 1935-10-19 1937-06-29 Singer Mfg Co Loop-taker and bobbin-case device for sewing machines

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE76209C (de) * Firma CARL PIEPER in Berlin N.W., Hindersinstrafse 3 Spulenträger für Ringgreifer
DE687110C (de) * 1937-06-24 1940-01-23 Singer Mfg Co Spulengehaeuse fuer Naehmaschinen
DE761437C (de) * 1940-01-16 1953-05-04 Singer Mfg Co Spulengehaeuse fuer Naehmaschinen

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US572090A (en) * 1896-11-24 borton
US663674A (en) * 1900-08-07 1900-12-11 Singer Mfg Co Thread-case for sewing-machines.
US944740A (en) * 1905-12-01 1909-12-28 Willcox & Gibbs Sewing Machine Sewing-machine.
US1995278A (en) * 1934-05-12 1935-03-19 Singer Mfg Co Rotary hook and bobbin-case device for sewing machines
US2085699A (en) * 1935-10-19 1937-06-29 Singer Mfg Co Loop-taker and bobbin-case device for sewing machines

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3033139A (en) * 1957-10-31 1962-05-08 Nippon Mishin Seizo Kabushiki Stitch forming mechanism of lock-stitch sewing machine for zigzag sewing
US3066624A (en) * 1959-06-09 1962-12-04 Sr Otto Jeppener Lock sittch machine with bobbin thread guide
DE19523627B4 (de) * 1994-06-29 2005-12-22 Juki Corp., Chofu Spulengehäuseanordnung und Nähmaschine
US20050115480A1 (en) * 2003-12-01 2005-06-02 Ronald Kronenberger Bobbin case assembly with thread tensioning element and method of drawing thread from a thread supply
US6901871B1 (en) * 2003-12-01 2005-06-07 Ronald Kronenberger Bobbin case assembly with thread tensioning element and method of drawing thread from a thread supply
ITPI20080063A1 (it) * 2008-07-16 2010-01-17 Ruffo Spa Metodo di cucitura a macchina di fili ad elevato spessore
WO2010007577A2 (en) * 2008-07-16 2010-01-21 Ruffo S.P.A. Method of machine seam for high thickness threads
WO2010007577A3 (en) * 2008-07-16 2010-06-10 Ruffo S.P.A. Method of machine seam for high thickness threads

Also Published As

Publication number Publication date
FR1152617A (fr) 1958-02-21
ES226907A1 (es) 1956-10-01
DE1078418B (de) 1960-03-24
GB790165A (en) 1958-02-05

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