US1102199A - Wax-thread sewing-machine. - Google Patents

Description

F. W. MERRICK.

WAX THREAD SEWING MACHINE.

APPLICATION FILED `001230, 1905.

1,102,199, Patented June 30, 1914.

5 SHEETS-SHEET l.

33.5/ @M pWOCtU. @Q-arney F. ''fi MERRIGK. WAX THREAD SEWING MAGE TVB. APPLIUATION FILED 00130. 1905.

jatented; June 30, 1914,

' 5 SHEETS-SHEET 2.

if@ i@ Lawn l ya, www

F.' W. MERRIGK.

WAX THREAD SEWING MACHINE.

APPLIQATION FILED umso, 1905.

5 SHEETS-SHEET 3r Mn/@ @Ln f. Ar. Q @wf www. L g @M fau F. W. MERRIGK. WAX THRED SEWING MAGHINE.

APPLIUATION FILED 0011.30, 1905.

1,1923, l 99, Paw-nte@ une so, 1.9m.

5 SEBETS-SHEET P. W MERRGK.

WAX THREAD SEWING MAGEINE.

APPLIUATION FILED 00T.30,119o5.

atentef June 30, 19144.

S SHEETS-SHEET 5.

Main 65565: COA/'Mw @MJ/ v materia-l the awl,

To all wiom it concern Be it known that Firmin, it?. lit a citiraen ot the United Stutesreeiding Boston, in the Qounty of Suffolk, oi'

have invented e certa. and useful improvement .y SeWingli/achines, of which the a specification, reference being' ii to the accompanying drawings. I

The .invention .ez'insists tiretj in devices nevel character iler actuating e hooi-:ed needle and automatically regulating the length of the withdrawing stroke :thereot` to snit the thickness of ther material or .steelt :it the place at Whie-hthe new stitch is to he formed therein, se that the amount. of threzitl that is, drawn for the purposes ef the said new stitch by the needle in making such stroke shall correspon@L properlyevith the said thickness. y

The invention consists, also, in ay sewing machine havinga an earl-feed, a (l the needle :iirangcd to work at the saine sifle of the and. also having in con` nection with the needle and needle-carrier means for causing the latter. when with drawn from the material or stock. to be inoied forward in the direction 0f the toed. Cut of the Way of the feed-movement oit' the nwl and aWLCnrrieI. Also, in the coi'nhination with the presser of a spur projecting; below the under side thereof and biting into the material or stock, so as te prevent slipping between the presserianci the said mateu rial or stock during the feeding movement, and also constituting a cl'i'iiiinel-giii le. Also. in a presser formed with e longitntlinal opening having walls whichl guide the awl and needle in their movements, and :in end- Wall which constitutes e back-stay tor'the ewl by which the latter is supported during the feed-movement against the resistance of the material or stock to being ted. Also, in the combination with a moving feeding-arm or feed-carrier, of a presser moving in unison therewith, and pressenlifting devices operating to raise the presser for the Stroke of the feed-carrier in each direction, respectively. y

ln the ilraivingsV-Figure l 'is a partly sectionalI front elevation of portion of a sew` ing machine having' an embodiment ot the inreniion applied thereto. Fig'. Q,a Sheet 2is n vie-w partly in elevation looking 'troni the left in Fig. l, a portion oi' the fixe heeft of inten, l

-ehine having iine heini; removed in order to shew y more clearly. Fig'. 3. partly sectional detail View on .cl seele showing" 'he l*l rienY on en enlarge-il .Y and relate/l parte. arately in siile elesi'nitting link 'which =n Jetrfeen the nee her and the sletten in of the iieeclle-aeluating rocher. Fig. o. sheet 2. shows views of the block occupying the 4curved slot of the the needle-actuating vonken and of the pin serving te connect the inotion-trans niitting` linli of Fig. 5 and the said block together. Figs. 7 and S, sheet 3, show elevations the linl; which serves to connect the presser-har with the associated rocker. Figs. D end 10, sheet I5, show different elerations ot the locking-clog of the pressere she-n' ine; the

serves a connect:

which the suidlocliing-dog and the cannaetnatecl arin which is' associated with such flog nre mounted. ligs. 12 and 13, sheet 3, show di'erent elevations of the actuating spring for the mening-dog of Figs. 9 and i0. le and 15, sheet. 3, show ditl'erent ele 'ations et the vain-actuated erin which is essoeintecl with the lor'l-ri1igclog et Figs. i) end. 1 0. 'Fig i6, sheet 37 is a bottoni View of the presser. Fig. i?, sheet 2, is an elevation of' the 'needle (letz -h'c l and on a lnfger scale than in Fig. l? vf. i8 is a partly sectional iront elevation of portion of a sewing ina- ;xntoinatic presser-toot lifting` devices combined with the devices for auto- 1i'i:iticelly varying the length of strokeof the in lig, 18. Fig. 2@ shows the nctimtonlcver oi the presseifoot liftingr elanip separateli'.

Referring, first.I4 to Figs. l to -i et' the -drawings,`l any wei-hanging arinl forniv nig partr oi the tie-cci frame of the machine, en is :i rotating shaft that is journals-'cl in hearings Within the said .211111, one of such hearings beingl shot-rn in dottedlines et 3 in Fi l. The said shaft serves in practice for the transmission of niotion'to various werk'- ing' parte in the. machine. A portion of the swireling Work-Supporting horn vof a Mclav or the like sewing machine is shown Mat 9G, and at 901 -eheivn the whirl that is Daily within Vgrooved guides whichare mounte'tl in the extremity of tho hmm. Tha construction, connections, ami modo of opmf ation of the Saiti horn miti Whirl may' he usual.

Antnwl is shown at 4f, Figo. f mi f. The uwi-hau carrying tho saliti :iwi itfigl'esnizeti :it 4l, it having V-shapot edges, :is shown iu Fig. 2, and being fitted t0 mom long itiir'ii vided upon the feedixigm'm 5, :is i. in Fig.- 2. The awlfmir and wi :im ctmit from the Shaft 2 throuvh com'wctions; w." are omitted fiom Fi l' md in. ordm.' to secure simplicity :uid cioni'utsa; in tho 0:1559 ot the hitter. Sua-h connections we shown 'i1 60, Fig.

2, is o Spring having ont: enti thtieofiii enguggmiient with it Stud 1S piro-- jecting from tho pi'esseif-iizir miti the other end thereof in eugziggco'mht with pm t300 projecting 'from the festim ami 5. Tt

smv spring opornt in connotation with. tho;

p1^ess0r-bmf und presser to press.: theo@ intimi toward the work-:5uppoiftmg hoi-1i 90. z-

anse the pi'oser to hold the Stoch :ignmt the end of the horn.

Pbcdanovenients; um transl'siittcti to 'l'.he feeding-arm .3 from the shaft 2 by deviens of any suitzihie und tippt'ovcti chzimtfter.

Various urfungomeut suitzihlc 'foi' tho pim pose :nre welihnowi, zaini. hence I imm omitted such dcvicofs fioi'zi the drawings: for the sake oi' ciezuness.

For tho support. oi the fvcdinfgfum tho hitter is uoilsrtiuctoli :is :i portion of n rockt-r which is mounted upon tho :1km mi.. The body or rolf :ift of the said rocket' The ssiiti body or rovi? shzift; is' supported zit. its opposite chuis by Fontaine-ruis 52, Fig. i, which :1ro fitttti to ings 33, Ti, proioctiiig upward from tho. fixed from@ l. The Sni'diin'is; have formati therein .QL-shots; 54, 54. to ieceix'o tho mais, oi the contvi'strom'ss. Tho sotites uw intuirioiiy tapoimi, mid tho portions of 'Uitg Conii91r-sciwfvfr=r which fit thritii: zm, t'oiiirzii. "iin: Centovsvimw may ho :mil sistwi i'iv'z'm time izo timo to tuk@ up wea?. v operatod to mijn iy the, iwf/- .v un. tiitgi'tafwiimarm inn i'i'zioswifso dimm; au with i-iintifm to the tiii'cttioii oi' food, to pince thc :iwi in the prop@ lino with. i'tsqwt to the mzwihf. nin the :teediu zi im. iii'oiii twifati i t :tation milities. the Suu-5l liv The presser or 'pit'essei' to :m inconsitiembie amount., rmt] prevent cizimpiiig mit. binding, the hmiy or rock- Shaft ofi the i'tmkr is; matie ma tong as is, permitted by locating tho lugs.: 533, 53. ns fall' apart as possible' upon tho top of the, fixed i. 'ame of the machine. Thereby ense, steutL iocsas, sind. correctness of movement of the :iwi iii :tteting am, Secund.

7 is :i needle, and 71 is the metilo-bnr car Wing the mme. The lo er pui-t of thc hoodie-har supported und. guidati hy :i pair of miis "2. Q, between which the said part of the iioetiehar works, tho smid rolls being mounted upon tho, Studs E, 73, that :117C ooni'miiontiy supijmrted in the. hostil of the um chine. In mfiffz to hoifi tht, modif-51ml from ii'io .'f; 1im1t tramv'erstriy with respect to the diventino of the fanti, the peiiplwrios; of the Poils 72, 725 grooveti, and tho grooves thereof receive the opposite edges of the moeiiohar, the Said edges piftefriibiy being V:shnped and tho grooves of the mils heilig torroespondiugly formed to Fit sut-h mlgvr. For the slippoi't, ahi guithmce of tho upiwr ing apart from each other,l and to hold both er said members or portions inx contact with opposite faces of the cam, tie-rod 111 is applied in connection with the free extremities thereon The said extremities are formed with lugs having vholes -therethrongh.

The 'stein of the tie-rod passes through one Iof such lugs, the head the tie-rod engaging with the under side of such lug. The tie-rod is screw-threaded :for a portion of its length and screwsy into the other lng, which latter is tapped to lit the said screwthreadedportion. A lock-nut 112I prevents loss of adjustment. After a forward feedrnovernent of the aivl, and. the withdrawal of the latter from the hole last formed thereby in the material or stock, the needle enters the said aWl-hole in the position in which the latter is left at the end of such feed-movement, passes therethrough to' receive the thread for the purposes oi' the next stitch-formation, and then is Withdrawn.

While the needle is out of the material or stock, holding its loop of thread, a movement forward in the direction of the feed is communicated to the needle and needlebar sniiicient in extent to prevent the aWl or aWl-bar from encountering them in making 'the surfaces of the rolls 72,

needle-bar, acting the ensuing feed-stroke. For the purpose et producing the said movement, the edges oi?" the needle-bar are made cani-shaped, by forming .opposite portions of such edges with corresponding inclines 721, 721, as shown inlig. 2 which, by action against A72, as they pass sach surfaces in the reciprocating movement ,t the needle-bar cause the needle-bar to swing in tie line of the feed around the guiding screw 75. The cani-portion or the in' "connection with the guide-rolls in the rising'nioveinent of the needle-bar, causes the lower portion of the needle-harto swing forward a sufficient distance to secure the required clearance, ln the descent of the needle-bar the cani-portion, co-acts with the guide-rolls to swing the needle-bar in the opposite direction into osition to cause the needle to enter the awliiole which has just been quittcd 'by the aWl, the return swing of the needlefbar being timed with reference to the 'return the awl-bar and awl so: that the needle-bar and needle shall not be carried against such .parts in the. course of such swing.

For the urpose of enabling the throw of the needlear and needle to he varied, the point `of, connection between the link 8 and "the arm 9` of the rocker 10 is made adjusttoivard and from the axis ot motion of the said rocker, in order 'that thereby the distance through which the said point of stroke of i l connection oscillates with the Ya second. link 17.

other end thereof with said arm may be made greater or less, as inaji7 be required. lt will be clear that, the greater the distance from the axis of inotion of the rocker 10 to the said point of' connection, the greater will be the distance through which thc point of connection Will oscillate and the Greater will be the errent of the movement which is transmitted through the link 8 to the needle-bar and needle, and that in proportion j as the said distance is increased or decreased the extent of the movement of the needlebar and needle will increase or decrease, as the case may be. For the purposes of the adjustment the arm 9 is slotted in the direction of the length thcieotas 91, 2, and a block 92, Fig. G, is titted 'Within the slot 91, the said block having a hole 93 therethrough receiving ay pin 83, the ends of which project at opposite sides or" the block. The link S is forked at its upper end, as shawn in Fig. 5, and receives in the space between the branches S3, 84, of the lork the arin l) of the rocker l() and the block 92 occupying the slot 91 in such arm, the said branches being formed with eyes or sockets Within which the opposite ends of the pin 82 fit. The eye or socket of branch 83 is split and furnished with a clamping screw, as indicated in Figs. 2 and 5, by means of which to tighten the saine upon the correspending` end ol' the pin 82 so as to hold the pin securely in place, In making the adjustment by which the throw of the needlebai' and needle is varied, the block 92 shifts along the slot 91 toward or from the axis of motion of the rocker 10.i In order that the needle shall at all times descend to the saine point and that the ditlerence in the extent of the movement of the needle shall only vary the point'which is yreached by the needie at the end of its withdrawing or rising movement, the slot 91 is ornied with a curvature that is concentric, in the lowest position of the said arm, with the point 81 ofpivotal connectin between the link 8 and f the needle-bar 7 To enable the adjustment of the point of connection between the motion-transmitting link 8 and the arin 9 of rocker 10 to be effected anton'iatically to suit the thickness of the stock which is being stitched, and variations in such thickness, lthe upper end of the link 8 is connected with the presserbar by interinediue devices serving to determine the position of the said point of connection in accordance with that of the presser, the said devices comprising a link 15; a rocker 1G having arms 161 and 162 and The link 15 engages by one end thereof with the pin 82, and by the the pin 163 whichis carried by the arm 161 of the rocker 16, and it serves to transmit movement from the said .rocker to the upper end of link 8, to occasion Vao lire

the shifto the point of connection between the Said link and the erin 9, farther from or u ,n l nearer to the axis of ,mot-ion of the rocker 10. One end of the. link l5 tits in the noteh 85, Fign 5, that is formed n the branch 84; of the link 8, the pin S2 passing through the eye or hole lthat is formed in this end of the link 15. The oppoeite enel ot the link l5 fits between the two lurzinehefa of the forked upper end of the erin lll ot' the rocker itil, :le indieiited in Fill. l., "he pin lt'ifzl, which hist is held in sow, te in the seid lnnnehef-i passes tlirong'h the eye or hole in this end of the seid link. For the purpose el enzihling;y the pin 163 to be Secured un plane within the sockets, the hitter tire split and :ire tur nished with ehiniping {serai/'s 1134: ll, by' means ot' which to eontrziet the ine tigh tl y upon the nin. The .rocher 1G supported by eenl'ei"fseiews 1.66, 166, lj' l which are applied to ings lill.; 167, projecting fronti the hezid ot' the nmehine-tinnie, the rocher being therebj,v snijipoitefl in platee. The body or rock-shaft of the sind rocker is :formed nt its opposite ends with tapering or conical sockets to receive the coniizil ends of the sadeenter Qcrews. Olieefthe saitfloeketiis Shown :i LGS in lligfs. 2 nucl The link l? connects the nrni. llll et the rocker lll with the preSser-bnr lll, and serres to tran nit .movement from the latter te the rot-.een Its upper end formed 'with il socketlili. Figs. l" :ind S. fitting the hemd of the Selew that is eiirried by the infin 162 oit the rocker. To eniihle the stud and socket t0 be fitted together ,lio :ifa to ohrinie play, :ind also to enable wein.' to be compensated for, the head of the Stihl is formed tapering, being lerne-it :it its outer end, :ind the socket vll is foi-ined 7with :i corresponding bore. The. lower end of the link li' in lorlned with :i Split socket '.ll., afee Figs, 7 and 8. iirovided with' ii elriniping serew lift. Within the, said split soi-liet phieeil the bushing 175 having- :i tzfineringg here lo tit theitnperinq body ot' the stud ilS, llifs. l, 2 and 41.-? whiei ,iff :ipplieal to the presser'hur (il.A At the smzill end oi the eoniezil pln'tion of the Stud 118 the hitler is fierewthrenileil and receives the hills4 lili hy menne oil -Whieh tha lower end ot the link l? iS'heligi in place 'upon the stud. ll)r ineens of the Suhl nuts the bnhing niet' be mused to .lit pri'iijieily 'Upon the stud 1S, :ind looseneei; diie to 'weer nizw be taken on. 'through the connections described ,the distante ot the einineetingpin 82 from the. exis et inotion oi'.z the roel-er il() iii anto nisitieiillj.' eoiitrizlled lijf the position of the "llfhen the n r is raised to :i higher petition in eoneeqnenee ot the plis-- snee olf ai portion ot steelt. of inereiiisetl thick' new beneath the ienne. the connecting pin 82 will be moved hirther ii mty from the axis ot motion ot the inches te, eo that the n.p word swing of the nir-ni l) Awill raise the the nynviird strokenf thel neetllelizir :mit

needle Thereby the length of the with (huir/ingr olie of the needle is :interni-fit'.- erilljj Contr: lleil to finit the thiehness of the stock, to einige loops of needle thri iid to he drawn. oi proper lengtlis for the eneeesisire stitehee, :ind variations; in the ilnckness of the steelt :ire europeiexited for.

In, or to ennhle the, :retin between the length olf' needle-Stmk; und the thielineais of the etoelt to he varied wh'n required, iroifisifni it; medi: :t'or it relative Shift or ndjnsliiient of the Apoint olf (.-onneetimi between the linlc tl find erin 9 to attain the ratio thnt is desired.. lliis relative shi-tt- 0r adjustment in neeoniplished lily @rinsing the sind point et connection to oeenpy :i position nearer to or further" troni thl axis ol" motion of the rnifltei.' l0 for n given poeition. et the prei er. 'lo this end the .stein ot stntl 1E ritt/stl in ii slet lli?j l* 'In :1nd 4, termed in the p1 eer-hin' Ul und extending lint nliiiiillir ol the intim', the said slot pro itling for :Jii'ljinetnient olf the stud. in the dilution. oit the length and the stud heim; eeeine' f' l ..1 tion by ineens of :i nnt- ISL Then the sind '18 is :.idjnsteil in the direetion oli the length oit the :ilot Gi? it [.n'ednees through the inten mediate eonneetions` :i eoii' .ioinling :id` jnstinent of the point o' eonneetitm between' the upper end ot the link :ind the arm 9, either toward or tron: the axis ol motion of the rocker l0 eeeoriling :is the stud 18 is :idioti the hitter. This; iii-minimi s :i propos-Minitetliferenee in the length or the neetlle-stroke$ corresponding with n given Imeition of the presten l 'l and 2 show :in :intomiitie loeliing mechanism eonihineil with the prestar :ind the deviesv for varying: lle length ol stroke of the needle. Fig. 4 shows the :mid lneehm nlsni Sepnritely on :in .nlairgerl seule. It eonipriises it `sector 169, Figs. il, 2 :ind l, forming part oit or uninet-ted with the rocker 16 and .moviiig infnnisun therewith, the dog 19, shown Sepnriiteljv in Figs. 9 :ind l0, which is mounted upon a pivot Q0, shown seperately in Fie. il, and provided with an eeeentrie portion 191 for engagement with the periplierail portion of the Said seetor 169, and :i pring 2l by means of which the siiifl dog 15) is tin-ned er swung around the Suid pivot se :is to canse its eeeentric portion thickness to engage with the sector. The, spring 21 is shown separately in Figs. l2 and 13, and in plaine 1n the machine 1n FlgS. l., 2 and 4.

incense It is forijn'ed'with a coil that surrounds and is concentric with the pivot 20, 4one of the extremities of the sprino' being 'engaged with the iiXed head of the trame as indicated in Fig.-1, and the other thereof with a pin 192-projecting laterally from the dog,- 19. The spring acts with a tendency to turn the dog so as'to cause the eccentric, engaging portion 191,01: the latterto take hold of the periphery of the sector 169 and thereby lock the rocker 16, presser-bar, and presser. For the purpose of intermittingly unlocking the rocker 16 to temporarily release the presser,

' the periphery of vthe disk 22 on the shaft@ is formed 'with a prominence or cam i221, and

' in connection With'the dog 19 and arm 23 is provided. Y"Ihe said arm 23 is shown separately in Figs. 1 4 and 15, and in place in the machine iii.Figs. 1, 2 and 4;. It is mounted to turn upon the body of the pivot-screw 20, and comprises essentially opposite sideportions 2551, 231, receiving between them the body of the dog 19 and having eyes or holes 232, 232, to receive and fit the body of the'pivot-scre\v 20, and a cross-web 22233 connecting' the said side-portions i231, 231. The dog 19 is furnished with an adjustable contact-piece which is constituted by a screw 193,7the latter being furnished with a locknut 194 to prevent loss of the adjustment thereof. Theacting endl of the said contactscrew is designed' to engage with the cross- 'iveb 233. In the rotation of the shaft Q, the

prominent portion Q21 of the periphery of the disk 22 presses againstthe arm Q3, and 'operates the said arm so as, by theengagenient of the cross-weh with the contactscreiv 193, to press back the den,l 19, turning the said dog so as to unclanip the secto and unlock the presser. rithe locking` devices are operated to held the presser locked at all times except duriiur` the return movement of .the feeding arm 5 after the feed-movement of the said. arm. I'

At 601 is shown a hand-lever for use in moving; the presser-bar and presser manually When it is desired to withdraw the presserrom proximity to the horn 90, as for'the purpose o-f permit-ting` stock to4 be introduced between the presser and horn, or removed., This hand-lever 601, of which the outer portion or extremity is brokenaway in Figs. 1, 2 and 4, is formed with a hub- por tion 602, 1, which ris sleeved upon the bod or rock'shaft of the rocker 16, as shown in t e said figure, whereby the hand-lever is supported. A slot 603 is formed through the' main portion of the said handlever, concentric with vthe body or rock-shaft of the rocker 16, and through the said slot passes the stem of :i screw 604, the threaded stem 0f which enters a screw-threaded hole that is ytapped inthe sector 169 .of the rocker 16. The body of the hand-lever 601is confined between the said sector and the radially-V projecting rim or Harige of the. head of the screw 604. The hand-lever 601 is acted upon by a contracting spiral spring G05 having oneend thereof engaged with. a projection on the side of the hand-lever, and the other end thereof engaged` with a. hook or the like, as at 606, upon the ixed head of the machine. By means of the saidspring the hand-lever is held normally in the position in which it is represented in the drawings. Pressure applied to the outwardlyprojecting portion of the hand-lever, operating to turn the said'handflever upon'its support, will carry the wall. at the inner'end of the slot 603 against the stein of the screw 60-1, and Will operate to turn the rocker 16 and withdraw the presser. In order to unlock the presser so as to permit theV said 221 of disk 22 and of spring 21, without A interference. TWhen, however, the handlever is turned as described above vto eifec't the withdrawal of the4 presser', the endwise movement of the bar 607 carries an end-Wall of the slot 608 against the pin 609, and during the remainder of the movement of the hand-leverthe arm is caused to turn so as, by the contact of its eross-Web 223 with the contact-screw 193` of the locking arm 19, to move the said arm so as to unlock the sector .169 and thereby free the presser. This unlocking precedes contact of the Wall at the inner end of slot'603 with the stem of screw 604. y

v The employment of a locking. mechanism as in Figs. 1, 2, and 4C, permits alight presseru spring to be used. In some cases I contem-. plate the employment of a presser-spring which is powerful enough to resist the tendency of the material or stock which is being operated upon to lift as the aWl is pulled therefrom and when the rise of the needle occurs. In such cases I employ automatic presser-lifting mechanism operatingto lift the presser at the beginningof the feedand to hold it lifted While the forward or feeding action of the avvl and presser takes place, `so as to facilitate the feeding of' the material or stock, then drop the presser and permit it to remain down during the rise of the awl, then raise the Presser during the return or recovery movement of the aWl and presser, and then drop'the presser` and. perto fit upon the presser-hinein a manner 'een 'the straightening of the knuckle or jointl then operates to turn the actuator-lever 044 upon its pivotall connection with block 64 so as t relieve the pressure acting to hold the clamping-lever (342 in engagement with the presser-lair, and in consequence of such relief the hold of the clamp upon the presserbar is relaxed. This relaxation permits the presser and presser-bar to accommodate its position to the thickness of the material or stock independently of the block, which latter comes to rest upon the cushions 6411, Gill. As the knuckle or joint passes the line extending from center to center, the actuator-lever is turned upon its point of pivotal connection at Gl?) with the )lock 64 until the clamping-lever (S4-2 has again been closed acaiust the presser-bar, whereupon the presser-bar and presser are again lifted, to be subsequently lowered againa and so on. The extent of the lift of the clamp is slight, being only sullieient to raise the presser to a small height above the upper surface of the material or stock. This fact, and the further fact that the clamp automatically operates to lift the presser a uniform extent every time, regardless of the height of the upper surface of the material or stock, and ot' variations in such height, enable the actual lifting to be effected within a relatively small portion of the cycle of stitch-forming and feeding operations and within the same relative portion of such cycle whatever the height of the material.

The presser 6 is furnished with a spur (lli), which is arranged to project below the under side of the presser and is intended to bite into the stock so as to prevent slipping;` between the presser and the stock durim;f the feeding` movement. The said spur is designed. also. to enter the channel or groove that is formed in the stock for the reception of the interclmined portions of the stitches, and thus to constitute a guide for securing the proper placing; of the said channel or n'roove in the path of the awl and needle. ln order to prevent the spur from being; lifted out of the channel or groove by adjacent prominent portions of the .stock passin;r under the presser and acting;r to raise the latter. the spur is mounted with capacity for independent movement with respect. to the pre-ser and is spring-actuated to cause it to remain within the. channel orfrroove and in engagement with the stock notwithstandin'ir slight elevation of the presser occasioned as stated. 'lhe said spur is shown formed upon the lower extremity of an arm which is mounted upon the side of the pressershank by means of a pivot-pin or stud 659 proiectingl from thepresser. The spring; by which the said arm is actuated is shown at (300, it beintya contractinp; spiral spring` having; one extremity thereof engaged with a pin' (579 projecting from `the upper part of the shank of the presser and the other 'end thereof engaged with a pin 689 projecting from the pivoled arm. For the purpose of determining'the limit'of the movement of the spur (340 under the action of the springr (i60, a pin or stud 600 is applied to the shank of the presser, it projecting therefrom into position for vemragement with t-he pivcted arm.

The presser is formed with a. longitudinal opening (500* which is shown best in Fig. l0, Sheet 3. The awl and needle work through this opening:` the walls of which serve to guide the awl and needle in their movements. The wall at the closed end of the said opening also constitutes a back-stay for the awl by which the latter is supported during the feed movement against the rcsistanee of the stock to being fed, and thereby is prevented 'from springing in consequence of the strain which it experiences in feeding the stock.

In order to enable a cast-off to be dispensed with and the machine to be correspondingly simplified iu its construction, l employ a straight hooked needle 7 having within itself means for taking and shedding the loop in forming the stitch. The said needle is shown best in Figs. 2, 17, and 19. lt has the open eye and the hook or barb thereof faced in the direction toward which the stock is moved in beine; fed by the machine. It will be clear that after the said needle has been caused to pass through the stock so as to project at the opposite side of the latter, and the thread has been laid by the whirl 901, or equivalent looper, around the needle and in the open eye thereof, the said thread will be drawn in the shape of a loop through the stock by the needle in its returning movement, substantially as heretofore. ln order that in the said returning movement of the needle the loop which is being` drawn thereby may not slip from around the needle over the point thereof, I provide the needle with a thread-detent by means of which the portion of the loop which extends around the needle from one side of the eye thereof is prevented from slippine; over and from the point. Such a detent is shown at 701 in t-he form of a spiral llange extending around the needle between the open eye and the needle-point, the said llangrc being: constituted by one wall of a groove beginning on one side of the needle at the open eye and terminating on the opposite side of the needle closely adjacent or at the point. It will he clear that the open eye. and hook or barb of the needle, in consequence of facing in the direction toward which the stock is moved in beine fed by the machine, will be shielded from the closedl end or hight and opposite side-portions of a loop of thread extending from the last completed stitch in the stock to .and

around the needle and strained about the latter by the advance of the stock in being fed. Consequently, after the needle has been moved endwise to and through the stock to receive the thread for a fresh loop,

and thereby has been moved Within the old loop so as to completely disenga or barb from the said loopv an bring the needle-stem into the latter, the hook or-barb will entirely clear the said old loop in the returning movement of the Iiedle'with the neviT loop, so that the old loop will shed readily and freely from'the needle over the said new loop.

I cla-im as my invention l. The combination with the needle, the needle-bar, the needle-actuating rocker, and the link directly connecting the needle-bar with. the said rocker, of means operating to shift the point of connection of the said link with the said rocker toward and from the axis of motion of the rooker to vary the stroke of the needle to suit. the thickness of the stock which is being stitched.

2. The combination with the needle, needle-bar, and presser, of the vibrating actuator-arm, the link in direct connection4 at its one end with the needle-bar and at the otherend with said actuator-arm and serving to transmit motionl from the actuatorarm to the needle-bar, and connections intermediate the presser and the link operating to shift the point of connection between such link and the actuator-arm toward and from the axis of motion of the latter as the presser varies its position.

3. The combination with the needle, needle-bar,4 and presser, of the vibrating actuator-arm, the motion-transmitting link in direct connection atpits one end with the needle-bar and at its other end 4.with said actuator-arm, and a rocker in operative connection with thepresser and the said link and serving to shift the point of connection between such link and the said vibrating actuator-arm as the presser varies its position.

4. In a sewing machine, in combination, a movable feed-carrier an awl and awl-carrier mounted thereoni a presser mounted on said feed-carrier and accompanying the same in its feed-movements, a needle, and needle-carrier located at the same side of the work, means to shift the needle and needlecarrier out of the path of the a'wl and av'lcarrier in the feed-movement, and means to lift the said presser during the advancing movement of the feed-carriegawl, awl-carrier, and presser.

5. In a sewing machine, in combination, a movable feed-carrier, an awl and awl-carricr mounted thereon, a presser mounted on said feed-carrier and accompanying the same in its feed-movements, a needle and needle-carrier located at the same side of the e the hook work, means to shift the needle and needlecarrier out of the path of the awl and awlcarrier in thefeed-movement, and means to lift the said presser during the feed and return movements of the feed-carrier, awl, awl-carrier, and presser.

6. In a sewing machine, the feeding-arm, the feeding devices carried thereby, and the presser accompanying the said devices in the feed-movements and provided with a work-.pressing-surface and with a spur projecting below the said surface and biting into the material or stock so as -to prevent slipping between the presser and said niaterial or stock during the feeding movement, and also constituting a channel-guide.

7. In a sewing machine, the feeding-arm, the feeding-devices carried thereby, the presser accompanying the said devices in the feed-movements, and the spring-actuated spur projecting below the under side of the presser and biting into the material or stock so as to prevent slipping between the presser and said material andstock during the feeding movement, and also-constituting a channel-guide.

8.' In a sewing machine, the combination Vwith the awl and needle and means for producing feed-movements of the awl, of the presser formed with a longitudinal opening within which the awl and needle work, and having an end-wall which constitutes a back-stay for the awl bywhich the latter is supported during the feedmovement against the resistance of the material or stock to being fed.

9. In combination with the needle, and needle-bar, of the rocker having opposite bearings in the4 line of the axis thereof, means-to aetuate the said rocker, a link directly connecting the needle-bar with the said rocker, and means operating to shift. the point of connection of the said link with the said rocker toward and from the axis of motion of the rocker to vary the' stroke 'of 110 the needle to suit the thickness of the stock which is being stitched.

10. The combination with a feed-carrier; means for operating the same for the purposes of the feed, and feeding means in connection with said feed-carrier, of a presser 'moving in unison with the said feed-carrier,

and presser-lifting devices operating to raise the presser for the stroke of the feedcarrier in each direction, respectively.

11. The combination with a feed-carrier, and means for operating the same for the purposes of the feed, of apresser moving in unison withv the said feed-carrier, and presser-lifting devices operating automatically to raise the said presserto a uniform distance above the upper surface of the material or stock for the stroke of the feedcarrier in cach direction, respectively.

12. The combination with a feed-carrier,

ipioenes carrier, and iifting deyces embracing a double-acting toggie by which the presser is' raised for the'srokeof he feed-carrier in each direction, respectiveiy.

i 13. The combination with a presser, of

lifting devices therefon embracing a double acting toggle and means for operating said toggle to raise the presser twice in each toend-ro movement of the said toggle.

14. The combination with a presser, of e lifting-clamp, end a double-acting toggle operating the said clamp and means for actuating said toggle to raise the presser twice in presence of nwo witnesses.

in each AL an ifro movement of the said toggle.

l5. The combination vitlr 4the feedingarni, the reciproc-rtory bar snnported thereby and provided with"` the regarding implement which penetrates the Stock, ,of a presser also ,",ippei'te'd by the said feedingarin, and a double-acting toggie'operatiug ee raise she said presser for the saroke oi the eeiiin-arrn in each direction7 respectively.

Inxtestiineny whereof eiix my signature FRANK W. MERR-CK.

Aliinonesses CHAs. F. RANDALL, EDITH J. ANDERSON.

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