US1356334A - Joseph berger - Google Patents

Joseph berger Download PDF

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Publication number
US1356334A
US1356334A US1356334DA US1356334A US 1356334 A US1356334 A US 1356334A US 1356334D A US1356334D A US 1356334DA US 1356334 A US1356334 A US 1356334A
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arm
needles
needle
carried
shaft
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    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B3/00—Sewing apparatus or machines with mechanism for lateral movement of the needle or the work or both for making ornamental pattern seams, for sewing buttonholes, for reinforcing openings, or for fastening articles, e.g. buttons, by sewing
    • D05B3/02—Sewing apparatus or machines with mechanism for lateral movement of the needle or the work or both for making ornamental pattern seams, for sewing buttonholes, for reinforcing openings, or for fastening articles, e.g. buttons, by sewing with mechanisms for needle-bar movement
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B29/00—Pressers; Presser feet
    • D05B29/06—Presser feet
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B73/00—Casings
    • D05B73/04—Lower casings
    • D05B73/12—Slides; Needle plates
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05D—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES D05B AND D05C, RELATING TO SEWING, EMBROIDERING AND TUFTING
    • D05D2303/00—Applied objects or articles
    • D05D2303/08—Cordage

Definitions

  • the invention relates to new and useful improvements in sewing machines and more particularly to a sewing machine adapted to make a flat scam for covering or Joining the edges of fabric, ⁇ f
  • An object of the invention is to provide a sewing machine' of the above character having a standard and an overhangin' arm supportingthe needles and cross stitc ing mechanism, with a supporting arm which is carried by the standard and which projects outwardly and upwardly from the standard and carries a depending portion which supports at its'lower end the work supporting arm proper, whereby, small tubular articles may be formed about said Work sup porting arm :md fed ofi' from the end thereof las they are stitched.
  • a further object of the. invention is to provide a sewing machine' for formino' a lint scam with stitchi'ng'mechanism whic com prises in effect two independent sets of stitching mechanism, 'one operating in the rear of theother, and so Varranged that each forms parallel rows of connected needle. loops, the needle loo s and connected threads formed .by one 'ing mechanism overlying in part or in wholethe needle 4 ⁇ loops and connecting threads' formed by the other stitch forming mechanism.
  • a further object sans .invasion ig to ' provide means for guiding the edges ⁇ oftwn sections of a fabric to be joined or covered, so that the edges 'of said sections moet substantially midway between the outer needles of the stitch forming mechanisms.
  • a still further object of the invention is to provide means for ,trimming the edges of [two sections of a'fabric to be joined prior to the lioinng or covering of the rsame by the stitching mechanism.
  • a still further object of the invention is to provide a stitching' mechanism of the above character which consists of two setsof i spaced needles, one set being arranged and Spcicaticn of Letters Patent.
  • a still further object of the invention is to provide ai stitching mechanism of the above character with separate thread la ing'devices above the fabric for Vietnamese set o needles.
  • Figure l is a plan view of a sewing machine embodying my improvements
  • Fig. 1a is a plan view of one of the cover plates
  • Fig. Q is a rcar elevation of the machine
  • Fig. 3 is an end elevation of the same
  • F ig. 4 is a sectional view on the line 4 4 of Fig. l;
  • Fig. 5 is a vertical longitudinal sectional view of' the ⁇ work supporting arm and the de )ending arm which supports the same;
  • ig. G is n horizontal sectional View through a portion of the work supporting arm. the throat plate being shown in plan;
  • Fig. 7 is a sectional view on the line 7-7 of Fig. 5;
  • Fig. 8 is a sectional view on the line 8--8 of Fig.V 5;
  • Fig. 9 is a sectional View on the line 9--9 of F ig. 5;
  • Fig. 10 is asectional view on the line- 10-10 of Fig. 9;
  • Fi 11 is a sectional view on the line Il 1 of Fig. 6;
  • Fig. 12 is s, detail of the lo er end of the depending arm, showing the cans for adjusting the 'stroke of the diierential feed igfil is a detailI partly in section and partly in plano an enlarged scale, showing the endA of th worksupporting arm, the
  • Fig. 19 is a View similar to Fig. 18, but showing the thread layin ho ks moved to a position where the neet les pass between the strands of the loops car edby the respective hooks;
  • Fig. 2O is a detail in pers ctive showing the auxiliary feed dog and its supporting bar
  • Fig. 21 is a detail in perspective showing the main feed dog and the supporting bar therefor;
  • Fig. 22 is a sectional view on the line 22-22 of Fig. 20;
  • Fig. 23 a detail in perspective showing the end ofthe looper shaft and also showing one o the looper carriers detached;
  • Fig. 24 is adetail partly in section showing the needle bar and the manner of supporting the needles. said View being trom in front of the needlebar;
  • Fig. 25 is a detail showing the needle bar and the needle supported thereby as viewed from the left in Fig. 24:
  • Fig. 26 is a similar View from the 'rear of the needle bar
  • Fig. ⁇ 27 is a View of the needle bar and needles from the right, as viewed in Fig. 24;
  • Fig. 28 is a sectional view on the line 28-28 of Fig. 27;
  • Fig. 29 is a plan view ofgthe needle clamp7 the needle bar being in section;
  • Fig. 30 is a top plan View of the presser foot
  • Fig. 31 is a sectional View on 31--31 of Fig. 30;
  • Fig. 32 is a detail view partly in vertical the line section, showingthe manner of attaching the trimmer arm to its operating yoke;
  • Fig. 33 is a detail 4partly in front elevation and partly in'yertical section; showingV a modified form of stitch forming mechanism; f 1
  • Fig. 34 is a plan View, more or less di'agrammatically showing the loopers and the loop retainer whichcoperates with one of the loopers;
  • Fig. 35 is a planV View of a'lthroat late used in connectionwith Vthis modified crm of stitch formingmechanisin;
  • Fig. 36 is a front elevation of the needle clamp and needles
  • Fig. 37 is a bottom plan View; and Fig. 38 is a top plan View showing the seam made by this stitch forming mechanisin.
  • the intention consists generally in a sewing machine having a supporting standard which carries an overhanglng arm in which reciprocates the n'eedle bar carrying the nee
  • the operating shaft for the machine is located in the standard.
  • a supportinv arm mounted in the standard and extending outwardly and upwardly therefrom is a supportinv arm and this supporting arm at its tree enA carries a horizontal arm which is parallel with the overhanging arm of the machine and it is also raised above the plan of the base of the machine. so that an operator may readily reach beneath said horizontal arm.
  • the horizontal arm at its free end carries a depending arm and this depending arm at its lower end carries the work snpporting arm proper of the machine which is [u'eierably cylindrical in cross section.
  • This work supporting arm projects toward the over-hanging arm and the free end thereof is substantially beneath the free end of the overhanging arm, so that the looper mechanism which cooperates with the needles may be located in this arm.
  • the horizontal 'arm carries a rotating shaft which is operated from the main shaft in the standard and the loopers are operated from the rotatingshattin the horizontal arm.
  • a differential feeding mechanism which is operated by suitable mechanism from the rotating shaft in the horizontal arm.
  • a trimmer is carried by the overhanging arm and operates to prepare the fabric edges for the stitching mechanism.
  • the fabric has its edges brought together on the upper side of the work supporting arm and the feeding mechanism operates to feed the joined edges off from the arm. The said edges are fed tothe trimming mechanism Where they are trimmed and.; hey arar then brought into abutted relatie lftoneac ⁇ f other and joined by the stitehin /mecha ism.;
  • the stitching mechanism consistsfof two pairsol" spaced needles, one pair being in rear of the other. 'There is a looper for each pair of needles Within the work supporting arm and thread laying devices for each pair of needles carried by the overhanging arm, soy that the ⁇ stitching mechanism forms in effect two independent lines of needle loops which are connected above (iis and below the fabric, and these pairso 1 I needlesfare so arranged that the connectin threads 'of the needle loops of one pair o needlesjoverlies in part or in whole the connecting threads of the needle loops o 'f the other set of needles.
  • my improved-sewing machine consists of a standardl, which is carried by a supportingl base 2. 0n this standard is mounted an overhanging arm 3.
  • the main .operating shaft 4 which is drawings, the arm 6, projects outwardly in a plane substantially at right angles to a plane containing the overhanging arm 3.
  • the horizontal arni'7 at its free end carries a depending arm 8, the dependin arm at its lower end carrying the cylin rical work supporting ⁇ arm 9.
  • This cylindrical work supporting armi) projects forwardly from ⁇ the depending arm 8 to a point substantially.
  • My machine is especially adapted fol' stitching.;r the edges of fabric to form tubular articles. Ii'he fabric having, the edges to be Ijoined is placedunderneath the cylindrical work supporting arm 9and the edgesn are brought up around each side of the armt until they meet at the upper side of said arm.
  • the horizontal arm 7 is located some dis tance above the base 2 ⁇ or the table on which.
  • a supporting head 10 in which vreciprocates a needle har 11 carrying, as here- .in shown, four needles.
  • the needles 12 and E13 form one pair of needles, while thee needles 14 and l5 -iorm another pair.
  • the needle lever at its outer end is connected hy a link 19 with the needle .har l1.
  • the shaft 23 is mounted to oscillate in suitable bearings 24 and 25 located within the Work supporting arm.
  • the lopper carrying head 22, as clearly shown in Hg. 23, has a projecting stud 26, on which is clamped an auxiliary-looper carrier 27.
  • the looper 2l is mounted in a suitable socket 28 inthe carrier 2l'. While the looper 20 is mounted in a suitable socket 29 in the looper carrier- 22, and is locked in position by a set screw 20 which extends throughthe stud'26.
  • the looper carrier 22 is cut away, as at 30 to form a clearance space for the needles. 'llhis construction permits either looper to be removed without affecting the other looper, and also permits of the looper being successive sively adjusted relative to the respective pairs of needles.
  • the carrier 2? can be moved about and along the stud 26.
  • the looper shaft 23 extends lengthwise of the work supporting;r arm to a point within the lower end of the depending arm 8.
  • shaft 31 is mounted to rotate in suitable hearings in the horizontal arm 7.
  • This shaft is connected by two operatincr links 32 and 33 with the main shaft 4.
  • 6u said main shaft fl! are two staggered cranks ⁇ while the shaft 31 ⁇ also has two staggered cranks. and, therefore, these links will oper ate to impart a positive rotation to the shaft 3l from the shaft 4.
  • the outer end of the shaft 3l is a.
  • crank piu 34 to which is connected a link 35.
  • This link 35 atY its loivcr end is pivoted to a crank arm 36 rigid with the end of the looper shaft 23.
  • the said link 35 is pivoted to a rod 37 at 38 and this rod 37 slides in a 'sleeve 39 which sleeve is mounted Aon an oscillating support 40.
  • the axis of the oscillating support 40 is at right angles to the plane of movement 'of the rod 37.
  • this rod becomes a movable fullnnm for the link 35 and in effect converts the link into a lever fulcrumed between its ends, so that the 'link 35 imparts not only an oscillatina ⁇ movement to the looper supporting.,r shaft V23, hht also ah endwise movement thereto.
  • the loopers are Aby this mechanism moved Yinto their needle loops, then given a sidewise orV lateral ⁇ needle avoidingv movement, after which they are retracted to shed their needle loops and then again moved laterally for entry of the'next needle loops.
  • This looper mechanism per Re forms no part of the invention and further description thereof is not thought necessary.
  • f pair ot' needles is l forward. as shown in Fi .it the lower end of the needle bar 11 is a needle clump For supporting and positioning the needles.
  • Said needle clamp consists oi' e needle head +11, which is clam ed to the lower end oi' the needle bar 11.
  • TPhe needle 1; is mounted in said needle head and held therein b v a set screw 42, see igs. 24 to 29.
  • the needle 13 is located 1n tlie lower end of the needle bar and is held therein by a set sez-ew 43.
  • the needle 13 has its point raised above the point of the needle 12, as in the well known manner where the needles are n idely spaced and a single looper co erates with both needles.
  • the needle 14 of t e rear mounted in the needle head il and is held therein by a, set Screw 1+i.
  • a collar 45 which. is also secured to the needle har and this collar serves as a stop for vertically positioning the needle 14.
  • the needle l is also carried b f the needle head 41and a set screw 46 holds the same in place.
  • a projecting lug 47 on the collar 45 determines the lvertical position of this needle 15. Said needle is set With its point somenhat above the needle 14, for reasons above stated.
  • each pair of needles has separate thread laying devices co erating with the same :dime the fabric.
  • lJn Fig. 17, the fabric is indicated at F.
  • the meeting edges of the two sections of f-.lbric to be joined are indinrell et f.
  • a thread o is uided by a thread guiding linger 48 and t e thread is laid hoek end forth so as to be stitched'to the fabric by the needle threads carried by the respective needles 12 and 13.
  • a second thread L is carried by a thread uidin finlii and this thread is laid baer and orth on die opper 'face of the fabric and joined limoni 'oy the threads of the respective needles il and 15.
  • the thread fingers 48 and 49 ien e movement in a direction substantially parallel with the line of ⁇ feed.
  • Coperatin with the thread finger 48 is a thread hoog Jil, while a thread hook 51 cooperates with 1h.” thread finger 4l).
  • the thread lingers 48 :and Alll ire brought to the position shown in Fig. 17. and then the thread hooks move 18, engaging the ilu-ends o and respectively, and forming loops, as shown in Fig. 19, 'between the .sir/[nds oi' which the respective needles 12 and 1l pass, the threads of course passing Mo ille raised needles 13 and 15.
  • the erm 52 is integral with an arm *55.
  • the rock shaft '56 which bearings 57 and 58.
  • This shaft 56 is oscillated by a link 59 which coperates with an eccentric on the main shaft 14., see Fi 4.
  • This sleeve carries a downwardly projecting arm 61, end to a link 62, see Fig. 13, and this link 62 is in turn pivoted. to an arm 63 teleseo ing Within the arm and clamped therein by a screw 64. Also mounted on the shaft 56 is a second sleeve 65, which is likewise loose on the shaft, but held from endwise movement thereon. 4In other words, the shaft 56 is merely a bearing support for the sleeves and 65 and the movement of the shaft 66 is in no wise imparted to these sleeves.
  • the sleeve has a forwardly projecting arm 67 see Fig. 1.
  • This arm at its outer end is pivoted to a link 68, which in turn is pivoted to a rhall stud fixed at 69 to the needle lever 16.
  • This ball stud is on the rear face of the needle lever and the overhanging arm is provided with a recess 70 to permit free oscillation of the needle lever.
  • the sleeve 65 has a second arm 71, which ⁇ projects downwardly therefrom, while the sleeve il() likewise has a downwardly projecting arm 72.
  • the arm 71 carries a spring-pressed plunger' Til, see Figs. 15 and 16.
  • This plunger is formed with a hand-piece 74 and a spring 7 5 is housed in the arm 71 which normally forces the )innger toward the arm 72.
  • the arm 2 is formed with a tapered recess 73" to receive the tapered end of the plunger, thus providing means for taking up any Wear and there by prevent any loose movement.
  • Said arm is alsov formed with laterally projecting spacedribs Til-76.
  • this detachable connection between the arms 71 and 72 is to permitthe sleeve 60 to he disconnected from its oscillating n1echanism,'sp that the thread hooks oscillated b this sleeve may be moved 1' a limited d1stance away from the needles.; IThis is for the purpose of giving access to the iff-elles for threading or renewing. lf the machine should be started with these parte disconnected, the arm 1 will he rocked and the spring plungetV vill be forced into the socket or opening in the arm 72 as soon as it cornes is mounted to oscillate in.
  • the thread fingers-mand 49 are carried at the lower end of a lever T6' and are held in place by suitable clamping means,
  • the lever 76 is pivoted to "a bracket arm 7T at its lower end and this bracket arm TT may be formed as a part of the bracket 54 which Supports the thread hooks.
  • Said lever 76 is connected to a link 78 and this link 78 is in turn connected to a downwardly projecting arm 79 see F ig. 3, mountedon the cross shaft 56.
  • the cross shaft 56 oscillates the arm 79 will be'moved back and forth and this will swing the lever TG in a plane substantially parallel with the line of feed.
  • the thread fingers are carried at the lower end of a lever T6' and are held in place by suitable clamping means,
  • the lever 76 is pivoted to "a bracket arm 7T at its lower end and this bracket arm TT may be formed as a part of the bracket 54 which Supports the thread hooks.
  • Said lever 76 is connected to a link
  • the threads for the .needles are led from the supply through suitable tensions T mounted on a bracket. 8() and thence through guides to the needles.
  • the threads are not shown in the drawings.
  • the tensions may be released by a suitable releasing arm 81. which is operated ⁇ from the presser foot lift ing mechanism.
  • Figs. 33 to 38 inclusive have shown a modified form of stitch forming mechanism. 'In this form of the invention the needles l2 a d' 13 forming the front pair of needles are'widely spaced while the needles 14a and 15 which form the rear pair oh needles are comparatively closely spaced.
  • the needles i4 and .15 being very closely spaced are also provided with a loop. r'etaiiier 2l".
  • This loop retainer has a projecting' finger 9i which is adapted to cooperate with the loiper 2l and hold the needle loops formediiu the threads of the needles 14a and l5 spaced as shown in Fig. 514. which permits the needle l5 to pass between the. needle loops.
  • This loop retainer is of the well known construction and further description thereof is not thought necessary. 'Said loop retainer is mounted inthe bearinglsupport on the front end of the vork supporting arm 9.
  • loopers 20 and 2l are mounted in the same manner as above described in cony Iiertion with Figs. and 23.
  • a trimming meeh anism which consists of a stationary trim ming blade 82 and an oscillatingtrlmming blade 83.
  • the oscillating trimming blade is clamped to an arm 84.
  • Thisrarm 84 is in turn clamped to an extended bearing 85 on the lower end ofthe yoke 86, see! Fig.
  • This yoke 86 is mounted on the presser bar so as to oscillate about the axis of the Said yoke has two spaced bearings through which the presser b'ar passes and one, of the arms is connected to this extended bearing 85.
  • a spring 87 surrounds the presser bar and forces the yoke downward along; said presser bar so as to hold the movable trimmer blade in ⁇ shearing Contact with the stationary trimming blade 82.
  • Said movable blade has a projecting part at the rear side thereof which continuously overlaps the stationary blade.
  • the yoke SG has a forwardly rojeeting arm S8 which carries a hull stud) which is pivotallyy connected to av link 89, see Fig. 4.
  • This link 89 is pivoted at 90 to a rocklever 91 which is mounted on 'a suitable bracket 92 carried by the standard.
  • the other arm ot' the roek leverV is pivoted to alink 93 which in turn is pivoted to a'ball stud 94 carried by the needle lever.
  • the link 89 will impart oscillations to the yoke S6 and this will in turn oscillate they movable ltrimming blade..
  • The" movable ,trimming blade 82 is carried .by the presser' foot and. tiierel'ore. both y trimmed said edges are abutted and directed to the stitching mechanism.
  • the trimmed ofi' strip is guided away from the stitching mechanism b v a strip delieetor.
  • This strip deflector is provided with a fixed section 9G which is secured to the presser toot and spans the slot through which the edges of the fabric are guided.
  • a section 9T is carried by a movable arm 98 which is pivoted to a lng 99 on the presser foot.
  • a spring 10U carried by the arm 98 bears against n square shoulder on this lug 99 and serves to hold this movable section of the strip delieetor in the full iine position shown in Fig. 30 or in dotted line position shown in Fig. 13.
  • the purpose of this movable section of the strip defieoini is to give access to the needles for threading or renewing.
  • the presser toot 101 is carried by the presser har 109. on which the ⁇ yoke S6, above described. is mounted.
  • This presser han' is mounted to slide in the snpiiorting head of the overlianging anni and may he raised either h5 the hand lever or by '.1 lever 101 which is connected to n suitable trendle.
  • This presser foot hns two needle openings 105 and 106.
  • the needle opening 105 is for the needles 11 und 15. while the needle opening 10G is for the needles 1.3 and 15S. 'l were is n stitch tongue 10T Carried h v the presser foot und projecting into enel; needle open ing.
  • This stitch tongue extends between the needles und the thi-ends a and 5 :ireizid across the respectivo stitch tongues :1 nd slide olf from the saune in n. well known way.'
  • the stationary trimmer 8:2 is mounted in ri groove in the presser loot und is Clznnped therein by suitable mechanism.
  • the presser font is Formed in two tions. n fixed sew tien 111% .fin-l :i yield' C section lilik see 151g. Ill), This yielding sei-lion moves bodily 11p-:ind down it one sidix oi' the lifted sev tion und :i sililnhle sp1-ing 11() noi-madly holds said yielding section on the fzilnie. There :i spnc'e between the sections 10H :1nd lili!
  • est the torwznd end whirl provides n gniding l'lninnel 111 for the nptnrned edges of the hdn'io seeiions whirl] :ire to he irinnned.
  • the lined section 9U o1' ille strip defini-tor is secured to the lixnd svetion nl' the presser tool :ind merely reels against nn np turned lug 11:50u the .Inomhli- .wl ion ol' the presser ioni.
  • This fixed section o1' the strip 11911111.1111' is nlm spnllll sllg'llllj' :lleno Lin' nnnnlile sei'tion ol' the presi-v1 font. so that' mid lnovrdilo .sefiion muy Vivid in :in upward direetion.
  • the purpose ot this niovnllle see-- lion of the presser Forli is to permit :en edge having n i-ross sonni. or ni' more than one ihielness. to in; properly held while il is lieing stitfhed to :in edge oi n :single thic'kness ;..l.s-ing beneath the presser foot.
  • Dil-eel l v beneath the presser foot und enrried h v the work' sinipoiting erin 9 is a throat plate 113.
  • This thi-ont plate is secured to the work supporting arm hy suitable screws 114.
  • Seid throat plate is provided with feed slots 115 and with openings for the needles.
  • the openings 117 are for' the needles 12 and 13 and the o )enings 116 are for the needles 14 and 15.
  • the needle o )enings of the need e openings 11.7 so that there is a solid portion of hroet plate which supports the rear stitch tongue 118.'
  • the needle 13 enters the sections of tabl-ie eloser to the meeting edges f than the needle 12, and likewise the needle 14; enters on the other side of the meeting edges substantially' the same distance from the meeting edges ns the needle 13, While the needle is on the other side and substantially the sume distance from the meeting edges :is the needle 12.
  • the pairs ot' needles are positioned one in reni* of the other. and there nre independent oo el'ating elements 'for eneh pnr oi needles.
  • n tln'ont plate 113 which is ada )ted for the .stitching ineehanism shown in ILigs. 33. and IH.
  • Suid thront plate is also provided with nn opening 116n for the needles 12 :ind 13a Sind a, stiff-h tongue 1155a carried by the throat plete projects between the needles into these openings.
  • Seid throat plete has :In opening 14g for the needles 14 :md L13n and n stitch tongue 118*l carried by the throat plete projects into this needle opening. This rear stitch tongue may be omitted if desired.
  • the fabric sections to he joined are fed to the stitching mechanism by a feeding meehanism which consists of a main feed dog d an auxiliary feed do ⁇ 120.
  • the main feed dog is carried by a eed bar 1215 screw 123.
  • the main feed bar 121 is located in the work supportingarm V9 and extends substantially from end to end thereof.
  • Said feed bar betweenv its ends is pivoted to a forked arm 124.
  • Said arm is mounted on a Sleeve 126 having an eccentrically positioned opening therethrough which receives. the bearing pin 128.
  • Said pin is locked to the work supporting arm by a screw 129. ⁇ By loosening this screw and turning the pin by a.
  • the rear end of the main feed bar 121 is in the form of a yoke having two arms 131 and 132, see Fig. 21. These arms straddle4 the louper shaft 23, which also passes through the forked arm 124.
  • the .arms 131 and 132 are pivoted to 'a lever 133.' This lever engages an eccentric 134 at its up er end and the eccentric 134 is carried liy the rotating shaft 31 in the horizontal arm. This eccentric carries the crank pin 34 of the loo er operating mechanism.
  • the lever 133 is ulcivumed on a pin 135'.
  • the ba r 122 which carries the auxiliary feed dog 12
  • the up and down movements, therefore. of the main feed bar willbe imparted to this auxiliary feed Tau'.
  • Said auxili'arv feed bar may be given a differential feeding movement relative to the main feed bar ⁇ through the following mechanism.
  • a link 143 is pivoted at 144 to the auxiliary feed bar 122, see Fig. 5.
  • the other end of this link is pivotedat 145 to a rock arm 146, which inturn is mounted at 147 in bearings carried b the work supportin farm 9.
  • a link 148 is pivoted at 149 to a ug 150, carried by the main feed bar 121, and the other und of this link 148 is pivoted at 151 to a block which slides in a se mental groove 152 in the' rock arm 146.
  • y y shifting the link 148. so as to vary the pivotal connection of the link with the rock arm, the oscilla tion of therock arm, due to the bodily movement of the link 14S, travelinvI with the main feed bar, may be varied.
  • the oscillations of the rock arm ⁇ 146 are imparted ⁇ throuvh the link 143 tothe auxiliary feed bar.
  • T e link 148 is shifted b a hand lever 153 which is connected by a hnk 154 to said link 148.
  • This hand lever is fulerumed on the work supporting arm and at its rear end is connected to a stud 155 which projects through a slot 156 in the arm of the machine.
  • a serrated plate 157 On the outer faceof the work arm there is a serrated plate 157 which is secured to the arm by suitable screws 158.
  • the stud 155 carries a hand 'piece 159 which is pressed by a spring 160 into contact with the serrated plate 157 and the serrations serve to lock the stud in an adjusted position.
  • the hand piece may be moved out of engagement with the serrated plate and the lever shifted in order to vary the position of the link 148 and thus vary the stroke of the auxiliary feed dog.
  • Fig. 3R of the drawingl l have shown two sections of fabric indicated at F which are joined by in v improved scam made on the stitch forming mechanism .shown in Figs. 33 toB inclusive.
  • the front pair of needles are indicated in 'this ligure at 12 and 13a whih ⁇ the rear pair of needles are indicated at 14 and 15,
  • the cross thread n is laid back and forth about the needles i12 and 13 ⁇ vihile the cross thread 7; is laid back and forth about the needles 14u and 15.
  • the auxiliary feed den' is preferuhlj; so 'clnlirolled :is to operate upon the .nniterinl ut a. slightly greater 'perfl than the 11min leed. dog ⁇ which gnthers in the materiel enllicientlyv to prevent j etohing the genie when operating upon istie or knit material.
  • the edges after they me trimmed are first joined by the needle threee ot' llnneedles l2 and 13, ioALether with the renner-ting' threads. whirl), i' srrilied idiom, mooiste of the looper thread helma' and the L''ose thread above.
  • lt is: olnious that minor elmnges in the ii-mile of rontrnetion and arrangement of wmf. 'f mrtienhtrljv the position of the needless. only be lne-le without departing' trom the spirit of the invention :is set forth in the appended rlaiins.
  • n work my portingr arm carried at the lower end oi said depending erin and haring its free end attendingr underneath the free end of said overhang-ing arm, a lei-iper mounted in the free end of said Work supporting erin, menne enrolling through said :mns projecting from the standard for operating' Said looper, a feed dog carried hy' said work supportingr erin and disposed so ne to fer-l the Work oil" from the end of the arm, and means extending through said urinei .Sno ported by the standard for operating said feed dog.
  • a work snl'iporting erm Carried at the lower end of said depending' arm and having its free end extending nnderneath the free end of the, overhanging arm, nlooper mounted Within the free end of said Work Supportingfafm Sind, egpey-ai-,- ing with said needle, and means extenofng liti through said arms supported by the standard for operating said looper.
  • a horizontal arm carried by said standard and projecting outwardly and upwardly therefrom, a horizontal arm carried at the outer :free end of said projecting arm, a. main shaft inv said standard, la shaft in said horizontal arm, and means for. positively rotating the shaft in the horizontal arm from theshaft in the standard, an arm depending from the outer end of the horizontal arm, a work supporting arm carried at the lower end of said depending 'arm and having its free end extending underneath the free enrd of the overhanging arm, complementa] stitch forming mechanism located within said work supporting arm, and means for operating the same from said rotating shaft in the horizontal arm.
  • a needle mounted on said needle bar, an arm carried by said'sta-ndard and projecting outwardly and'upwardly therefrom, a horizontal arm carried at the outer free end of said projecting arm, a main shaft in said standard, ⁇ a shaft in said horizontal arm,
  • a renin feeddm'gs :1 feed bnr located Within said nor-k supporting arm, and supporting suii eed dog.
  • und means operating through said suspending means for actuating the feed lmr.
  • moin food flog s feed berloeatefi within said work supporting erm,L and supporting seid ire-.l dog. means opersing through solo' suspending ineens forL actuating the feed hun un, auxiliary feed dog :et the free end oi suiel work supporting arm, und ineens i'or ji ⁇ in said auxiliair); feed dog a differential movement from the feed bur of the umili iced dog.
  • mec lanism located within said work supporting erm. feeding mechanism carried by seid Worl supporting arm, trimming 'rneohanisnl located in front of said needles and includingr :i ⁇ movelfle trimmingv elude operating in a horizontal plane for prepari-ing the edges of the 'fabric lo be stitched by the needles.
  • a sewing machine including in combination, two pairs of gspneed needles, a ⁇ threaded looper for each pair of needles, one pair of needles being arranged in rearl of the other pair, the needles of onepnl beingF 'offset relative to the needles of the other pei' and thread laying devices for each pairof needles, said pairs of needles being sofdisposed that the loops inthe looper t eed of the looper cooperating with Athe rear;I pair of needles overlie the' loops formedin the looper threeii by the looper eogerefing with front panol needles.

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3006301A (en) * 1958-05-19 1961-10-31 Irving Constant Sewing machine for concealed slide fasteners

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3006301A (en) * 1958-05-19 1961-10-31 Irving Constant Sewing machine for concealed slide fasteners

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