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US2332125A - Chain-stitch sewing machine - Google Patents

Chain-stitch sewing machine Download PDF

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Publication number
US2332125A
US2332125A US381242A US38124241A US2332125A US 2332125 A US2332125 A US 2332125A US 381242 A US381242 A US 381242A US 38124241 A US38124241 A US 38124241A US 2332125 A US2332125 A US 2332125A
Authority
US
United States
Prior art keywords
thread
looper
needle
loop
take
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
US381242A
Other languages
English (en)
Inventor
Zonis Sydney
Jr Arthur S Meloy
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 US381242A priority Critical patent/US2332125A/en
Priority to US438520A priority patent/US2318447A/en
Application granted granted Critical
Publication of US2332125A publication Critical patent/US2332125A/en
Priority to CH258561D priority patent/CH258561A/de
Priority to AT169690D priority patent/AT169690B/de
Priority to DEP30227D priority patent/DE836726C/de
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
    • D05B57/02—Loop takers, e.g. loopers for chain-stitch sewing machines, e.g. oscillating
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B51/00—Applications of needle-thread guards; Thread-break detectors

Definitions

  • This invention relates to chain-stitch sewing machines and more particularly to single thread chain-stitch machines having stitch-forming mechanism including-a conventional wing-type rotary looper as complemental to an eye-pointed -needle in enchaining loops of thread. carried through the work by the needle.
  • the rotarylooper casts ofi one loop of thread as the beak of the looper is entering a succeeding loop of thread presented by the needle.
  • the newly seized thread-loop is thereafter expanded by the rotating looper and presentedfor subsequent entrance by the looper while seizing a succeeding thread-loop.
  • Fig. 1 is a vertical longitudinal section, partly in front elevation, of a sewing machine containing the present improvement.
  • Fig. 2 is a horizontal longitudinal section of the bracket-arm of the machine.
  • Fig. 3 is an enlarged longitudinal section of the looper mechanism assembly unit, the section being taken in a plane containing the axes of rotation of the looperand stub-shafts.
  • Fig. 4 is an enlarged vertical section, transversely of the bed-plate, of the lubricant-containing casing housing the looper-shaft driving gearing.
  • Fig. 5 is a front end elevation of the machine, with the bed-plate in vertical .section, the takeup guard removed, and the looper in needlethread loop seizing position.
  • Fig. 6 is an enlarged front side elevation ofthe needle and looper, in the loop-seizing position of the looper illustrated in Fig. 5; fragments of the bed-plate, the work supported thereby, and the feed-dog being shown in vertical section.
  • Figs. '7 and 8, 9 and 10, 11 and 12, and 13 and 14, inclusive are views respectively similar to Figs. 5 and 6, illustrating successively difierent positions of the needle, looper and takeup mechanism during a stitch-forming cycle.
  • the sewing machine illustrated in the drawings has a frame including a bed-plate I, from one end of which rises the standard 2 of a hollow bracket-arm 3.
  • the bracket-arm 3 terminates at its free end in a head 4 overhanging the bed-plate l adjacent the end thereof opposite the standard 2.
  • a horizontally disposed main actuating shaft 1 carrying at one end thereof a combined hand-wheel and belt-pulley 8.
  • the mainshaft 1 carrie a crank-disk 9 apertured to receive a shouldered crank-pin I i secured to the crank-disk by a screw l I.
  • the main-shaft 1 carries a peripherally grooved belt-pulley 23 connected by a clip-belt 24 to a similar pulley 25 carried by one end of a horizontally disposed bed-shaft 26 performing one rotation for each rotation of the main-shaft 1.
  • bed-shaft 26 is rotatably journaled in a ball-bearing 21 supported by a lug 28 depending from the bed-plate
  • the bed-shaft 26 is Journaled in a bearing-bushing, 29 suitably secured in a horizontally apertured wall 38 of a casing 3
  • is chambered to provide a lubricant-reservoir 32 into which the bedshaft extends, the bottom wall of said reservoir comprising a closure-plate 33 detachably secured by screws 34 to the lower face of the casing 3
  • the spur-gear 35 is in driving engagement, within the reservoir 32, with an intermediate gear-wheel 31 of a looper mechanism assembly unit.
  • the gear-wheel 31 is formed upon or otherwise carried by one end of a horizontal stubshaft 38 and is disposed adjacent an end face of a cylindrical bushing 39.
  • the stub-shaft 38 is rotatably journaled in needle-bearings 40 disposed at the opposite ends of a longitudinal aperture 4
  • the stubshaft 38 is restrained against endwise movement by a collar 42 suitably secured upon said stubshaft adjacent the end face of the bushing 39 opposite the gear-wheel 31.
  • the stub-shaft 36 is provided with a longitudinal bore 43 extending from the gear end of the stub-shaft to a port adjacent the opposite end of the stub-shaft.
  • the stub shaft 38 is also provided wtih radial oilducts 44 connecting the shaft-bore 43 with the needle-bearings 40.
  • the shaft-bore is preferably provided with a wick 45 protruding slightly from the gear end of the stub-shaft 38 within the reservoir 32.
  • the gear-wheel 31 is in driving engagement
  • the gear-wheel 46 is disposed ad acent the same end face of the bushing 39 as the gear-wheel 31 and is formed upon, or other- 6 wise carried by, one end of a horizontally disposed looper-shaft 41.
  • the looper-shaft 41 is substantially parallel to the stub-shaft 38 and is rotatably journaled in needle-bearings 48 disposed at the opposite ends of an aperture 49 extending longitudinally of the bushing 39 eccentrically of the longitudinal center line of the bushing.
  • the looper-shaft 41 extends through the bushing 39, and suitably secured upon the looper-shaft 41 at the endthereof opposite the gear-wheel 46 is a looper-shaft confining collar 50.
  • a wing-type rotary looper of conventional form and complemental to the needle H in the formation of single-thread chain-stitches is provided with a shank-pin 5
  • the looper-shaft is also provided with radial oil-ducts 53 connecting the shaft-bore 52 with the needle-bearings 48 of the looper-shaft.
  • the bore of the looper-shaft 41 is preferably provided with a wick 54 protruding from the gear end of the looper-shaft and extending past the oil-ducts 53.
  • the rotary looper referred to has the usual curved and slender loop-seizing beak 55 formed at the outer end of a loop-expanding body 56 having inwardly divergent side walls and terminating at the rearward side of said body in a transverse notch or loop-detaining throat 51 inclined to the axis of rotation of the looper. Extending rearwardly beyond the throat 51 is a loop-twisting and spreading wing 58 which holds the needle-thread loop in position for subsequent entrance by the beak 55 of the looper.
  • the looper-mechanism assembly unit above described is removably and adjustably supported in a horizontal opening 59 provided in a wall 60 of the casing 3
  • the work is advanced past the stitch-forming mechanism by a feed-dog 62 of the drop-feed type and which may be actuated in any usual or suitable manner.
  • the feed-dog 62 operates through feed-slots 63 provided in a throat-plate 64 suitably secured upon the bed-plate i, said throatplate also having the usual needle-aperture 65.
  • the thread-handling or take-up mechanism comprises a plurality of thread-engaging devices relatively rotatable about parallel fixed axes.
  • One of these devices consists of a circular takeup disk 66 secured by screws 61 upon a head 68 at the free end of the crank-pin ID; the disk 66 being concentric with the axis of rotation of the main-shaft 1.
  • a thread-confining fiat ring 69 secured to the disk 66 for rotation therewith by a pair of adjacent thread-engaging elements in the form of studs 10 and an auxiliary thread-engaging element or stud 1
  • are carried by the main-shaft 1, said studs perform one rotation for each complete reciprocation of the needle.
  • An auxiliary thread-handling device comprises a rotary take-up disk 12 and a rotary threadconfining flat ring 13 held laterally spaced from the disk 12 by a pair of adjacent and radially equidistant thread-engaging elements or studs 14 connecting the disk and ring for unison rotation.
  • the radius of the orbital path of movement of the elements 14 is less than that of the studs 10, 1
  • the auxiliary take-up disk 12 has a hub 15 secured by a screw 16 upon one end of a rotary shaft 11 disposed rearwardly of and parallel to the main-shaft 1; said shaft 11 in the present case having its axis of rotation in the horizontal plane containing the axis of rotation of the main-shaft.
  • the shaft 11 is journaled for rotation in ball-bearings 18 provided in the bracket-arm 3 of the machine. At its end opposite to the take-up disk 12, the shaft 11 carries a peripherally grooved belt-pulley. 79 connected by a clip-belt 80 to a similarly grooved pulley 8
  • is twice the size of the pulley 19, so that the'shaft I1 rotates twice for each rotation of the main-shaft 1.
  • the orbital paths of rotation of the several take-up or thread-engaging elements 10, H and 14 are preferably contained in the same vertical plane, whereby the needlethread may be passed in one motion over thestuds of the respective disks, and the necessity for intervening thread-guides is obviated.
  • a face-plate 82 Secured in any suitable manner upon the bracket-arm head 4 is a face-plate 82 formed at its upper edge with a guard-flange 83 extending usual slack-thread controller spring 89 associ ated therewith, said tension-device being of the type' imposing an adjustably uniform tension upon the thread.
  • the thread then passes about the usual presser-bar controlled guide-rod 90 and forwardly over the studs of the two take-up devices to a thread-guide 9
  • the needle I! has just begun to rise and the beak 55 ofv the looper is entering the needle-thread loop N' formed by the rising needle, and is also about to enter the loop N" of thread previously expanded I engaging position and begins to take up some looper from the slack thread made available by I the take-up elements 10 and 14 during the rising movement of the needle. While the auxiliary take-up element H has taken up slack thread duringthe described major expansion of the thread-loop N, the take-up elements 10 have reby the looper and detained at this time in the throat 51 thereof.
  • Hi and 14 are together giving up thread and thereby rapidly creating slack thread between the take-up and the needle, while the auxiliary rotary take-up element II is at this time clear of the thread.
  • a surplus of slack thread available at this time, in excess of the thread required for expansion of the thread-loop N' seized bythe looper, has the advantage of accommodating variations in thickness of the work and in stitchlengths, without requiring any retiming of the take-up mechanism.
  • Figs. 7 and 8 of the drawings the beak '55 of the looper is shown as advanced to a point at which the looper is about to begin to expand the newly seized thread-loop N, and has freed the previous loop N" from the throat 51 of the looper.
  • the feed-dog 62 is still out of engagement
  • the rotary take-up elements leased the thread N and the take-up elements H have continued to give up slack thread. Therefore, the auxiliary take-up element H has merely'taken up surplus slack thread not required by the looper for. expansion of the thread-loop.
  • the stitchsetting position of the parts may vary slightly dependent upon the thickness of the work and the length of the stitch.
  • the thread-loop N has reached maximum expansion as shown in Figs. 11 and 12
  • the continued effective action of the take-up elements Ill, II and 14 now draws thread through the tensiondevice and from its supply until the take-up elements reach the posi tion illustrated in Figs. 13 and 14.
  • the stitchsetting position of the take-up elements varies with the requirements of different thicknesses of work and different stitch-lengths, the length of thread drawn from its supply by the take-up elements automatically meets said requirements.
  • the wing 58 engages the inner limb of the thread-loop N and twists said limb outwardly, while the outer limb of the thread-loop slides along the rounded edge of the wing 58 and is thereby deflected inwardly, as shown in Figs. 13 and 14 of the drawings.
  • the thread-loop N is thereby drawn into the throat 51 of the looper and is held spread for subsequent entrance of the looper-beak 55 and in a position permitting the looper to subsequently cast off the loop.
  • the improved thread-handling mechanism is thus coordinated with a wing-type chain-stitch looper to (1) provide slack thread during the rising movement of the needle and available .to the looper for major expansion of a thread-loop seized thereby from theneedle, thereby obviating stealing of thread from its. supply; (2) take up surplus slack-thread during said major expansion of the thread-loop while automatically accommodating variations in thickness of the work and in stitch lengths, and at the same time preparing a condition conducive thereafter to rapid drawing up of the previous loop; (3) set the stitches uniformly; (4) draw the length of thread from its supply requisite to meet conditions.
  • the present take-up and wing-type looper combination is capable of handling the poorer grades of commercial threads, as well as the better grades.
  • the take-up elements are rotated about fixed axes, they may be operated at any speeds which the other mechanism of the sewing machine may withstand and, accordingly, the take-up mechanism of the combination can, in no sense, be considered as a speed limiting factor.
  • a single thread chain-stitch sewing machine the combination with an endwise movable eye-pointed needle, a rotary wing-tyne looper adapted to enchain thread-loops presented thereto by said needle, and means for rotating said looper, of rotary needle-thread take-up means constructed and arranged to give up thread available to the looper at the needle side of a looper-seized thread-loop during expansion of said thread-loop by said looper, and to draw up cast-off loops of thread subsequently to substantial expansion of succeeding thread-loops by said looper, and actuating mechanism for rotating said take-up means.
  • a single thread chain-stitch sewing machine the combination with an endwise movable eye-pointed needle, a rotary wing-type looper adapted to enchain thread-loops thereto by said needle, and means for rotating said looper, of needle-thread take-up means including a rotary thread-engaging element constructed and arranged to take up surplus slack thread at the needle side of and during a substantial portion of the expansion of a threadpresented,
  • a single thread chain-stitch sewing machine the combination with an endwise movable eye-pointed needle, a rotary wing-type looper adapted to enchain threadloops presented thereto by said needle, and means for rotating said looper, of relatively rotatable take-up devices for controlling the needle-thread during stitch formation, said devices including a thread engaging element coordinated with said needle and looper to take up surplus slack thread at the needle side of and during a substantial portion of the expansion of the thread-loops by said looper.
  • a single thread chain-stitch sewing machine the combination with an endwise movable eye-pointed needle, a rotary wing-type looper adapted to enchain thread-loops presented thereto by said needle, and means for rotating said looper, of a plurality of needle-thread takeup devices rotatable at difierent frequencies and constructed and arranged to begin shortening the thread-loop, cast 01f by the looper, as the looper approaches its position of maximum expansion of a succeeding thread-loop, said devices including a thread-engaging element effective to take up surplus slack thread at the needle side of and during a substantial portion of the expansion of a thread-loop by said looper, while permitting the previously cast-oif loop to remain dormant.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
US381242A 1941-03-01 1941-03-01 Chain-stitch sewing machine Expired - Lifetime US2332125A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US381242A US2332125A (en) 1941-03-01 1941-03-01 Chain-stitch sewing machine
US438520A US2318447A (en) 1941-03-01 1942-04-11 Looper mechanism for sewing machines
CH258561D CH258561A (de) 1941-03-01 1946-11-06 Einfaden-Kettenstich-Nähmaschine.
AT169690D AT169690B (de) 1941-03-01 1948-12-15 Einfaden-Kettenstichnähmaschine
DEP30227D DE836726C (de) 1941-03-01 1949-01-01 Einfaden-Kettenstichnaehmaschine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US381242A US2332125A (en) 1941-03-01 1941-03-01 Chain-stitch sewing machine

Publications (1)

Publication Number Publication Date
US2332125A true US2332125A (en) 1943-10-19

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Family Applications (2)

Application Number Title Priority Date Filing Date
US381242A Expired - Lifetime US2332125A (en) 1941-03-01 1941-03-01 Chain-stitch sewing machine
US438520A Expired - Lifetime US2318447A (en) 1941-03-01 1942-04-11 Looper mechanism for sewing machines

Family Applications After (1)

Application Number Title Priority Date Filing Date
US438520A Expired - Lifetime US2318447A (en) 1941-03-01 1942-04-11 Looper mechanism for sewing machines

Country Status (4)

Country Link
US (2) US2332125A (de)
AT (1) AT169690B (de)
CH (1) CH258561A (de)
DE (1) DE836726C (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130008362A1 (en) * 2011-07-08 2013-01-10 Wenzel Edward J Apparatus for stitching vehicle interior components
US8833829B2 (en) 2011-07-08 2014-09-16 Inteva Products Llc Method for stitching vehicle interior components and components formed from the method
US9340912B2 (en) 2011-07-08 2016-05-17 Inteva Products, Llc Method for stitching vehicle interior components and components formed from the method
US9809176B2 (en) 2011-07-08 2017-11-07 Inteva Products, Llc Method for stitching vehicle interior components and components formed from the method

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2533400A (en) * 1946-09-26 1950-12-12 Union Special Machine Co Sewing machine
DE1102536B (de) * 1956-06-30 1961-03-16 Denzaburo Terayama Umlaufende Einwellen-Mehrscheiben-Fadenaufnahmevorrichtung fuer hochtourige Naehmaschinen
DE1115112B (de) * 1958-04-15 1961-10-12 Willcox & Gibbs Sewing Machine Fadengeber fuer Naehmaschinen
DE1902000A1 (de) * 1969-01-16 1970-08-27 Union Special Maschinenfab Greiferschmierung fuer Naehmaschinen
GB1570007A (en) * 1976-03-29 1980-06-25 Union Special Corp Automatic chain-stitch sewing machine

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130008362A1 (en) * 2011-07-08 2013-01-10 Wenzel Edward J Apparatus for stitching vehicle interior components
US8833829B2 (en) 2011-07-08 2014-09-16 Inteva Products Llc Method for stitching vehicle interior components and components formed from the method
US8919270B2 (en) * 2011-07-08 2014-12-30 Inteva Products Llc Apparatus for stitching vehicle interior components
US9340912B2 (en) 2011-07-08 2016-05-17 Inteva Products, Llc Method for stitching vehicle interior components and components formed from the method
US9512547B2 (en) 2011-07-08 2016-12-06 Inteva Products, Llc Apparatus for stitching vehicle interior components
US9790627B2 (en) 2011-07-08 2017-10-17 Inteva Products, Llc Method for stitching vehicle interior components and components formed from the method
US9809176B2 (en) 2011-07-08 2017-11-07 Inteva Products, Llc Method for stitching vehicle interior components and components formed from the method
US9869044B2 (en) 2011-07-08 2018-01-16 Inteva Products, Llc Apparatus and methods for stitching vehicle interior components and components formed from the methods
US9873966B2 (en) 2011-07-08 2018-01-23 Inteva Products, Llc Method for stitching vehicle interior components and components formed from the method
US9889802B2 (en) 2011-07-08 2018-02-13 Inteva Products, Llc Method for stitching vehicle interior components and components formed from the method
US9937877B2 (en) 2011-07-08 2018-04-10 Inteva Products, Llc Method for stitching vehicle interior components and components formed from the method
US10364520B2 (en) 2011-07-08 2019-07-30 Inteva Products, Llc Apparatus for stitching vehicle interior components

Also Published As

Publication number Publication date
AT169690B (de) 1951-12-10
US2318447A (en) 1943-05-04
DE836726C (de) 1952-04-15
CH258561A (de) 1948-12-15

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