claim herein is:- l.'A feed-off-arm sewing maebine having a frame including a bracket-arm, a subs'u-antially- 65 straight tubular work-arm extending under said bracket-arm in a direction out of parallelism with a vertical plane containing the longitudinal axis of said bracket-arin, and a carrier for said workarm stitch-formiiig mechanism, differentially 70 mov@ble main and auxiliary feed-dogs, a rotary actuating shaft di@sposed within said -,vork-arm, means for rotating said shaft in a continuous direction, and connections within said work-arm for imparting differentially timed work-advane- 76

ing- mo-Vements, to -aid @feed@;dogs@ from said, detu@. atingshaft.'@ 2. A 'feed--@off -arm sewin4- @m@;6h@ine' ha'ving -a fr@@me@,including -a brabket-arm-, a:substanti4 Ily@tr@aight@:tubWar work arm extending u I nde rz said brackot-arm ina, dir6 I eticin out of'parallelism, with a vertii3al plaiie conta'ming@the longitudih;,il ixis@ of s@id bracket-arm, aiid t carrier for s,%id workarm, stitch-formihg, mechanism", diffetentiillly 10 movable waiii and auxiliary feed@dogs,, a rotary actuating shaft having, one'end disposed@@within and @ exteiiding cro@swise @ of th I e length of @said worka,rm, means for rotating said shaft'in a contin@uous' directio'n, @d @ connections@ within 15 said work-arm for- imparting differontially ti-rned ivork-@dValicing- @ moverxietits to said feed-dogs from said actuating shaft. 3. A fe6d'-off-arm I sewiiig mdchine haviiig a fram,e including a bracket@arni, a @u 4stantially 20 straight tubular Work-arm having'@ a free' end extending undi@r said bracketarm and a carrier arm for said work-arit ofj'set laterally from said bracket@arm, sti@ch-forming mechanislm,'differentiany movable. main and auxiliary I feeddogs 2E, a rotary'shaft j'ournaled in said carrier arm and extending iiito one end Of said *ork-arm, said rotary sllaft being di---posed substantially normal to the length of said.work@-arm, means for rotating. s I aid shafl' in acontinuous dirocti6n, and connections within said work-arm for imparting diffe-rentially timed@ workadvancing rnovenients to said feed-@dogs from said actuating shaft. 4. A feed-off-arm -sewing machiiie havinr.,. a frame including a bracket@arm a horizontally dispose@d work-@arrq having a free end extendin 9 7@nder said bracket-arm, and a horizontahy dispo.sed work-arn, carrier arm substantieilly coplanar with said work-arm, stitch-forming me@chanism,'differentially movable main and auxiliary feed-dogs, a rotary sha-ft journaled in said carrier arm and disposed substattially noriffal to the length of said work-arin, me-ans for actuating said shaft, and connectiohs within said wotk-arm for imparting' difforentiiilly tiin@d work-advancing moveriients to said feed-dogs from said actuating 8haft.- 5. A sewing machine compri.@iiig@:i. fram6 hav.'ing a bed formed with @, forwardly, extbhding arm, a laterally bxteiiding arm carried by @aid forwardly extending @.trm, a tearwardly extending work-sapporting arm carried by and substantially coplanar with said latexally @ exteriding arm,. a bracket-arm risirig from the rearwakd end of @ said forwardly extending arm and, termi'@5 nating's@t its free end in a head overhanging the free end. o' said work-supporting arm, a, shaft, journaled horizontall-y in said bracket-arm, a reciprbcatory needle connected to be drivdn by said shaft, a. second shaft journaled ih said lat6rally. extending arm. in parauelislii. with. said first mentioned shaft, an operative co nnection between said shaft@, loop-taking mechanism in said work-supp6rting arm, -operative connections for actuating said looptaking mechanism from C5 said second shaft, and main and auxiliaiy feeddog carriiers differentially reciprocable within said work-supporting arm, said feeddog carriers deriving operative movements from said second shaft. 6. A sewing niachine having a frame including a bradket-arrn, a substanti,-,Ily straiglit tubular work-arm having a free end extending under said bracket-arm, and a carrier arm for said ivork-arm offset laterally from said bracket-arm, 75 stitch-forming mechanisni, a feed-bar in said work-,qrm, @a:feed-@dog. eatried. by, said'feed- ar, an actuating shaft bperativelyconnected to @ said feod-bar for'. impqrting@ @ work-advaiicing @ move-@ ment@ to@ aid feed@-dog i s n a direction longthwise of said @ wokk Arm,-@-said iactuA'.,ing shaft beilig disposed within and transversely of the length of the @work-arnl,; means for actuatiiig said shaft, an auxiliary fe6d-dog, and meqns disposed in said wojrk-arm fot iin@parting work-advancing movem.ents@ to said AiLxiliaty feed-dog from said feed- 10 bar. @ 7. A feod@-off-arm@ sewing -m'achine having a frame including a bracket-arm, a substantiallysti,5,ig@,,-t tubtilar work-ar-m having @a froe end extendin_g under. said 'bracket@arr-q, @ and a. corrierlarm @@for said @ Work-@arml, stitch-for-min@ mechanism-, a fe6d-bar extending le@,igthwise of said work-arm, a maiti feed-dog carried by @said feedbar adjac@ent to th@) free@,end of said work.-arm, a rotary 8haft jbumalod in said @earrie, -arm and o extending into @said work@ariq trallsversely of the lengtli of thb'v@ork-.arm, @m&ans for rotating said shaf,t, an a,etuating@ m6fnbc-r carr,-Led by'said shaft within thO work-arm and operatively engagin I g 'd f6ed@ sal -bar -for impqrtihg work advaricing and 2;-@ return @moveinents to said main feeddog, an actuating me.,nber carried by said, shaft withi'n the@ worlc-arm for raisitig, and lowering the feedbar, an auxiliary feed-dog disposed adia8ent And mo . vable differentially With respect to said mo@,in :@o ie6d-dorrl- and mearis disposed in said work"arm for actuating said alixiliary feed-dog from said f6ed-bar. 3. A feed-off -arm sewiiig machine having a frame including a bracket-arin, o@ horizontally- :,.5 disposed substantially straight work-iirm having a free end extending under said bracket a-,m, and a horizontally disposed work-arr.,i carrier Prm substanti ally coplanar with said work-arm, a main feed-dog@ carr-ying biir in s,,zid work-arm, 10 a @rotary shaft 4ournaled in said carrier arm, 4 rr@eans for imparting work-iadvancing movemetits to @ said -rnain feed-bar from said rotary shaft, an auxiliary feed-dog carryinv,, bar @ slidably @ cUspos6d upoii said mali feed-bar, and rpeans operated by said main feed-bar for:actu,-,ting c-aid auxilidry feed-bar diff erentially with. resi)ect to sai.d;rhai n feed-bar in the direction of:the length of -said work-arm. 9. A feed-off -arm seviing m@Lehine having a fr@ime inelliding: a'b@acket-arm,. a,-q arm extendi-ng fotwardly@_from-said bracket-@-@,.,m, a lot6tally extendiil g arm carried by the fo-r,7is.-rdly extending arm, and@ a rearwardly extehding -work-arm carried by and substantially coplanar laterally extehding aimi stitch-form'mg mechanism. diff,-@re.,itiblly movable main and ,iuxiliary feeddogs in said wolrk-orm, and.metns for impattiiig idifferential W6rk-advancing r@iolreriients tG said'feed-dogs including act,@atinf,, mechani@@rri supporte d by said laterally extending a@.-@i and operativ ely donliected,to",-,iid@feed-d,@gs. 10. A sewing machine"having-a bracket-arm, a tubular work-arin having a suspended free@ end extendin g under said bracket-a@ml, a needle car- Gli rying rriemb--r supported by said bracket-arm, a rot-ary needle-tb-read-ldop taker iburnaled within said work-arm, main and auxiliary feed-dogs at the'free end Of said worli-arrd, actuatibg mechanism@ housed within said tublaar work-arm fot 70@ rotating said loop taker in a continuous di@ection, and feed-actuating connections housed witwn said work-arm for imparting differential workadvancing movements to said main and 75 auxiliary feed-dogs.

4 1,08,8,806 11. A feecl-off-atryi sciwinff niachine having a bracket-arm, a substantiallystraight tubular work-arrn extending under said bracket-arm in a direction out of parallelism with a vertical plane containing the longitudinal axis of said bracketarm, a carrier arm for said work-arm, a recipro-, catoi:y needle, niechanisin carried by saidbracket-arm for reciprocating said needle, a rotary needle-thread-loop taker journaled within said lo work-ari-n at the free end thereof, main and auxiliary feed-dogs at the free end of said work-arm, a rotary shaft supported by said carrier arm, means for rotating said shaft, and mechanism operatively connected to said rotary shaft and i5 extending lengtl-iN@,ise of said work-arm for rotating said loop taker ip a continuous direction and for irtiparting diiferential work-advancing movements to said main and auxiliary feed-dogs. 12. DiffereT-itial feeding mechanism for sewing 20 machires comprising differeritially movable main and auxiliary feed-dogs, a feedbar carrying said rnain feed-dog, means for actuating said feedbar to impart operative work-advancing movements to said main feed-dog, an auxiliary feeddo-. carri-er, and means for imparting work-advancingrqovemeiits to said auxiliary feed-dog from said feed-bar comprisiiig, a lever pivotally r@iounted between its ends upon said feed-bar and having oppositely directed arms extending trans30 versely of the direction of feed, anchoring means engaging one arm of said lever to limit the movew-ent of one end of the lever, a-Tid a link connecting the other arm of said lever and said auxiliary feed-dog carrier. 13. Differential feeding mechanism for sewing machinescorliprising differentially movable main aiid auxiliary feed-dogs, a feed-bar carrying said main feed-dog, mepns fo,. actuating said feed-bar to impart operative work-advancing movements ,10 to said main feed-dog, an auxiliary feed-dog carrier, and means for imparting ,,vorkadvancing movements to said auxiliary feed-dog from said feed-bar comprising, a lever pivotally mounted. between its ends upon said feed-bar and having 4,-, oppositely directed arms e%tending transversely of 'Lhe direction of feed, anchoring mea-ris engaging one arm of said lever to lir,,iit the movement ef one end of the; lever@ and an,adjustable connection b@,tween tb-e other arm of said lever and the auxiliary feed-dog carrier. 14. In a sewing machine having a horizontally disposed +@Ubular work-arm, a feed-bar disposed within and extending lengthwise of said workarm, a main feed-dog carri-ed by sai.d feed-bax, 5,,-, means for actuatin-. said feed-bar to impart operative work-advoncing movements to said feeddog, an auxiliary feed-dog carrier disposed within said work-arm, ard means for imparting workadvar,eing movements,to,said auxiliary feed-dog GO from qaid feed-bar comprising a vertically disposed two-armed lever plv&.ally mounted between its ends upon said feed-bar, anchoring means engaging tlae lo,7ve-., arm of said lever to thereby influence the amplitude of movement of the upper arm of the lever upon reciprocation of said feed-bar, and an adjustable connection between the upper arm of said lever and the auxiliary feed-dog carrier. 15. Tn a sewing machine having a horizontally disposed tubular work-arm, a main feed-bar disposed within and extending lengthwise of said work-arm, a main feed-clog carried by saict feectbar, means for actuating said feed-bar to impart operative work-advancing movements to said main . feed-dog, an auxiliary feeddog carrier slidably mounted upon said main f eed-bar, a ver- 5 tically. disposed twoarined lever pivotally mounted bet*een its ends upon said main f eed-bar, the upper arm of said lever having a segmental guideway intersecting the plv6tal axis of the lever, a link having one end secured for adjust- 10 meht in said guideway and its other end operatively connected io said auxilia@ry feed-dog carrier, and meians operatively arichoring the lower arm of said lever to said work-arm, whereby rocking movements are imparted to said lever upon i5 reciprocation of the main feed-bar lengthwise of the work-arm. 16. Differential feeding mechanism for sewing machinescomprising differentially movable main and auxiliary feed-dogs, a feed-bar carrying said 20 main f e -dog, means or ae g sai feedbar to impatt operative work-a eing movements to said main feed-dog, an auxiliary feeddog carrier supported by said feed-bar for movement relative thereto, a lever pivotauy mounted 25 upon said feed-bar for rocking movements about an axis transvetse to the direction of feed, an operative connectioii between said lever and the auxiliary feed-dog carrier, and fixed lever-anchoring means providing a guideway confinin.- :30 therein one end of said lever, to thereby compel rocking movements of the lever upon actuation of said f eed-bar in the directibn of feed. 17. Differential feeding mechanism for sewing machines comprising differentially movable p main and auxiliary feed-dogs, a feed-bar carrying said main feed-dog, means for actuating said feed-bar to impart operative work-advancing moveme,.lts to said maift feed-dog, an auxiliary feed-dog carrier supported by said feed-bar fOr 40 movement relative thereto, a lever pivotally mounted upon said feed-bar for rocking movements about an axis transverse to the direction of feed, said lever having a rounded end, an operative connection between said lever and the 45 auxiliary feed-dog carrier, and relatively adjustable anchoring brackets confining therebetween said rounded end of the lever for limited rockina and slidina. movement. 18. Tn a sewing machine having a horizontally 50 disposed tubular work-arm, a main feed-bar supported in sald work-arm for endwise reciprocatory and for rocking movements, said feed-bar extending lengthwise of the work-arm, a main feed-dog carried by said feed-bar, means for ac- 55 tuating said feed-bar, an auxiliary feed-dog carrying bar slidably supported by said tnain feedbar, a vertically disposed bifurcated lever embraciiig said main feed-bar and having one of its fureations pivotally secured LIDon said main 60 feed-bar for rocking movements of said lever about an axis transverse tG the direction of feed, the other furcation of said lever havi-ng a segmental guideway extending upwardly from the pivotal axis of the lever, a link having one end 6,5 adjustably secl--Lred in said guideway and its other end operatively connected to said auxiliary feedbar, and anchoring means engaging said lever below the pivotal axis thereof. 70 WALTER MYERS.

Patented Jan. 22, 1939 U@N@ITED STA@,-TES PAT@E'NT@'@ OFF.@1-- @C@E 1,988,806 D]IFFERENTIAL @F.EEDIING:MCHANISM @FO R SEW]ING P4ACMNES T7y7-llter Myei-s, Br@'d-epert, C-onn., assignor to'The Siiigerl. @manufa@t@-ring Company, Elizabet h@ -J., @& cori)oration@ of New' Jersey Application,@.October 21, 1933, Serial, No. 694,530 ]LS CWrns; - (cl. 112L.-2-@09), Th@'@s@ inveiitioi@ relates@,@ 'Llo, improvements- @iii. v@ ork@advan@eing or @fe&ding Lmechanisi-na@ for sewiv,,,@@r-,iachi-yies@a.nd@has for.:its@object:to provide-A lple and drrrlpoet differ-ential feeding. mecll-@ 9,rjism@ w- Iiieh is @.Particularly adai)ted;,:for em--@ riodiment in a seiving iii@ich@ine-..work-arm @for ,,,@,dvaiicir.g. the woxk.lengthwise of said.@arm_:.@.. '@Vith...tl,,e@.i.boT7e,@:@@nd other obj@,,cts- in.vi@-w,. as@ will hereii-iafter appe@- @-, the inventio-Ti., comprises io the- devices, -c ombti,,iatio@-@is'. and arra,-igements, of patts hei-e-ii-iafter set forth arid illustrated- iii the@ ar,co-Tnpanying dr,-win,as: of a praferried. embodime-qt of t,,Iae- invention, . from,..,which the, severaj. f cattires of the invention and.:the@ advantages at'@,qLTied,@'herebywilibe@readily@understoodbythose sk',Iled -irl- t-he art, @lig@ I i@,,, ,, Lrbnt@ elevation, partly in @ section, of a feed-,jff-arn-i sewing machine embodying@ the@ i-nventior. Fig.. 2 is n. top plan view of the ma@. 20 chine witli the head at the@ free end of the bracketarm broken. away. Fig. 3 is a top plan view of -the wo7zk-arin, -with the cover-plate-and,throat-plate: ,- emo@,,4,ed. Fig. 4 represents :a vertical section len,,)@thwise and substantially. centrally -of 2-i the s-e-will@ @iiachine .-work@arml- and sliowing. in, side elevation a portion@@@. of the . bracket-a-im s-@,andard a@,id portions of the needle-carrying -bar: a-id presser-device., Fig. 5 i:epresert@s.an.enlarged transverse section -of the. feed@- bars substantially @@i) rn the line. I.-5@ of Fig@ 4. , F-ig' @6 r&presents ari e.nlargc-d trans-verse section -of tha f ea-d-bars, sub@, stan@Llially on the, line- 6@-6 Gf Fig.@ 4. Fig. :7 rep i,esents an :erl-arged troiisverse- section. of @ the feed-bars subsu,"nti-,i.11@ c@n- the line 7-7 of Fig@, 4. l@-,ig., @' -,is n,. re--specbive view, of tlie- stud@bolt cr,l--inecti-on between'the rock-lever upon@the.-.inain@ feed7bar: @,,.id the@ @lirk actuated thereby.. Tia@, present. differential feeding mechanism is hei:ei,@-,i desc2ibed and- ilIListrated in the acdom4 panyi-ng draviiilgs as embodied i?-i a feed--off -arm ,,@e7@,,ing inaciiiiie which is w-ore fully disclosed in :ny priorU. S. pa-tent q@DPiicatiOn SerTial No. 6-@,17,409, filed Au.-.. 4, 1932. Reference may bel ii2,n,de to said prior patent application for an understandi,.ip., of details of constructio@i of the, sew,r,@ Lyi-ach-'iae not herein disclosed, but it iS tG be tiiid@.rsi.-ood 'uhot the present invention is not limit,ed in all its aspee'Ls to said specific sewi-ng raachine. The @-ewing machina 4,llust--.-ated in the drawings has a fraiLie comprisin.- a bed includin.- a forwarl,ly extending ar@-n I carrying a laterally,extending hollow arm 2 which,: in turn, caxries a i@earwardly e,%tending tubular4 and substantiaey vtraight work-arm 3. ; The @arms 1, 2 @and 3 are prf-- ferably , cast.:ir@tegr,.al aird@ are disposed sub-, stantiq -lly 'horizoiatally,'@coplanar or: at: the @@same@ level, forming: a - u -bed., The tubqlar@ wo-rk-arm 3 is opeii a@tits top: and:preferably. the entiro leigth tlaereof, said worl,@@arm bieing clo8ed 5. by a, detachobla cover-plate,4, a removable throat@ plate 51 and a pair- of :Pivotally. @secured@:auxiliary@ coverplate,@,,@ 6 disposed at: opposite sides of @ the, throat @p.'tate@ The@throat@platehosaplurality.,of feed@lots@ @7 ar-ld in the @present@:case: a pair @of i 10 - ieedl6-@apertvxos B. Rising fr6m.-thei-frame.,@bed,l a,@ the rea@ward portion of the arm @l,.'Ls the@stand-@ ard 9 ot@ a hollow'bracket-arm 10 which. terini.- nate.I 7@ i-ii .a head:, 11 'overhanging @the@ free end @of the @v6rk @sul)porting, arm 3.: - Rotatably jo-drraled in the; b-racket-arm,lo:@.is a ho 4Z r@ oiata@lly:d-isposed@ i-naii-i sh,@ft 12 extendiilg: outsid e of th,-@ biacket-ar-,ii at the right hand side tlie.,co f, the prbie-,tin@@;end of said shaft carryii-ig a clip@I)elt pulley@ 13'and a driving-belt pul-@ 20. ley 14@ with its. asso,,,iated -balarce-wheel.: I Ati i-@s opposite end, -the mai--q shif t@ carries @a crank-. disk 1,6'opero@tively connected iii any, usual @or suitable manner, as by mea@i.-is of a li@-1k: 17,t w-ith . a vertilally i-,@ecip@.@ocatory@ . needle-bar@ 18-.;: The 2r) iicedle-bar. is j , ournaled' f or@ eiid@v;se @eciprocation s it in u' able: bearings provide@-I @ii-i the@ bracket@-arm, head 11; aiid in the present instance: carries:-at, it@s 'LovTer bn'd @ a p@,,ir@: of i-Lieedies 19@.' @ Also @.jouriiL,,Ied -for@ vertical riovement'in the head;ll@@is 30, the@ tistial pre8ser@bar 20- carryiiig at its lower end q presser-foot 21. Di@@posedi Wi-tilin @@and extei@,-Iirlg; ler@th@vise.'bf tb-e laterailk e@ctb7lding -hollo-vi@ a@rm2@ of th6-frame: act-aating sl-iaft 22 adjace-Ti@t: o-ne 35@ eiid i-n- a, beavi,,-ig 23, iii said ar.-D_ 2'. The @shaft 22: enterq@ -nd exL-,e,--ids abross; the; for"@ -,AT,@rd eiid 6f@..'Ghei-,@io.11@-aTn-i-.@3'i-.q'a direction sub@' stantia'IY- iiovrnal to@ the length bf the v,,ork-@'axm, said ".@haft 22 being ibarral6,d. ih a- bearing 24@pro.@i 40 ,7idp-d i,,i: the aide@@wall of- tlie:@work-:arm@'remote om the carrier-arm 2. @ Thi@ end of@ the shaft 22, opp-.site to the work-arrq@ @end. t,.iereof.:6xtenids 6-C 7do'of the arr-ri@2: ana, car-rie@ a, clilibLlt.pulley' ,_t.S4 25 Of the@ saine size as the main, shaft pulle3@@ 13-, thei 451 w t o ptilleys - beitig cop-nected @ b3@ a clip belt 26@' Enclosing the belt. 26 alid the pulleys conn6eted, t'_qereby, i@ a belt@@tiard, @97@ disposed@ external-lyof the nachiiie frame and@ @detachably.,@ securecd tt-iereto P-ny. sui-tabl-e.'manner, I aid@,belt@gu@,trd. 50' haviii.- a. rLemo.-,7able side @ cover@ 23. - Carried by the actuating shaft 22'.withiii th6 work,"arm@3 are'the@bevel-gears 29--'and-3.0,@meshing - with'Ibevelpinioi),@ @31.'bf -one..heaf the.: sizial of. said.. bevel@,gears. - The @ pinions :3.1 are.,-carriedi -54i

1,988,806 by horizontally disposed ari(i parallel shaft-seetions 32 suitably journaled in the work-arm 3 to extend lengthwise thereof. The shaft-sections 32 have universal joint connections with intermediate shaft-sections 33 connected in like manner with parallel shaft-sections 34 joumaled in suit@-ble bearings provided within the work-arm 3 at the free end thereof. At their rearward ends, the shaft-s6etions 34 carry bevel-gears 35 meshing io with bevelgears 36 (only one pair of gears 35, 36 being shown in the drawings) for driving the vertical-axis loop-takers 37 in which are jotirnaled thread-cases 38. The loop-takers rotate twice for each complete reciprocation of the 15 needles 19 and coop-.rate therewith in the formation of lock-stitches, but it is to be understood that the present invention is not limited to any specific form of looptaker mechanism, as it will be evident that it is also adapted, amongst others, 20 for eribodiment in a feed-off-arm machine having a chain-stitch looper mechanism, and particularly of the type disclosed in the pending U. S. patent application of A. B. Clayton, Serial No. 692,273, filed Oct. 5, 1933. ,)5 The work-advancing feeding mechanism compri-ses a main feed-dog 39 and an auxiliary feeddog 40 operating in the feed-slots 7 of the throatpla,te 5, the main feed-dog 39 being disposed rearward of the auxiliary feed-dog in the direction o.L seam formation. The main feed-dog 39 is secured by screws 41 upon the rearward end of a substantially-straight main feed-bar 42 extending lengthwise of the work-arm 3 and fulcrumed to rock and slide upon a pin 43 which is eccentric 35 to its shank portion 44 rotatably adjustable iii thefulcrum-block 45 suitably secured upon the bottom wall of the work-arm 3. At its forward end, the feed-bar 42 is formed with a vertical fork 46 embracing a split-block 47 on a feed-ad4o vance eccentric 48 which imparts endwise movements to the feed-bar. The eccentric 48 is adjustably secured upon the hub of the bevel-gear 30 in any suitable manner to provide for changi-ng the length of feed of the work. 45 Secured to the side of the feed-bar 42 by screws 49, is a bar 50 which is formed with a horizontal fork 51 embracing a split block 52 on a feed-lift eccentric 53 secured upon the actuatin@ shaft 22 within the work-arm 3. The eccentric 53 imparts 50 rocking movements to the feed-bar 42 about the fulcrum-pin 43 to thereby raise and lower the main feed-dog 39. The auxihary feed-dog 40 is secured by screws 54 upon the rearward - end of an auxiliary feed55 dog carrier in the form of an auxiliary feed-bar 55 endwise slidable upon the main feed-bar 42 and also extending lengthwise of the work-a'rm 3. The feed-dog carrying end of the auxiliary feed-bar 55 is reduced in'thickness and is guided 6o by an L-shaped angle bracket 56 secured by screws 57 upon a side face of the main feed-bar 42 to overhang the auxiliary feed-bar 55, as illustrated in Fig. 6 of the drawings. A similar Lshaped angle bracket 58 is secured by screws 59 65 upon the main feed-bar to overhang and guide the forward end of the auxiliary feed-bar 55, which latter is confined against sidewise movement upon the main feed-bar by a retaining plate 60 secured by screws 61 upon the side of the main 70 feed-bar opposite to that upon which the angle bracket 58 is secured, as illustrated in Fig. 7 of the drawings. I Pivotally secured by a stud-screw 62 upon a side face of the auxiliary feed-bar 65 at a point 75 between the angle brackets 56 and 58 is the rearward end of a link 62 of which the opposite or forward end is apertured to pivotally receive the cylindrical end 64 of a stud-bolt 65 which has an in'uermediate flattened portion 66 and is reduced and threaded at its opposite end. The flattened 5 portion 66 of the stud-bolt is adjustably fitted into a guideway in the form of a segmental slot 67 provided in 9, furcation 68 of a bifurcated vertically disposed rock-lever 69, said stud-bolt 65 being secured in adjusted position in the slot 67 by 10 a nut 70 and a washer 71. The other and shorter fureation 72 of tl-le rock-lever is slidably guided by the side of the main feed-bar 42 opposite to that slidably guided by a thickened portion of the furcation 68 below the segmental slot 67. The 15 furcation 72 is pivotally secured upon the main feed-bar 42 by a horizontally disposed stud-screw 73 and a lock-nut 74 to provide for rocking movements of the lever about an axis transverse to the direction of feed. The segmental slot 67 in 20 the furcation 68 is of suiracient length to permit of adjustment of the stud-bolt 65 into horizontal alinement with the pivotal axis of the rock-lever 69, it being understood that the radius of curvature of the segmental slot 67 corresponds to the 25 length of the link 63. The lower arm of the rock-Iever is preferably solid throughout the width thereof and its cylindrically rounded free end 75 is slidably and rockably disposed in a guideway provided by opposed :10 lever-anchoring angle-brackets 76 suitably secured by screws 77 upon the bottom wall of the work-arm 3, whereby said brackets may be relatively adjusted to,take up wear. When the stud-bolt 65 connecting the rocklever 69 and link 63 is adjusted into horizoiital alinement -,vith the stud-screw 73, the main and auxiliary feed-bars are reciprocated in unison. However, ivhen the stud-bolt 65 is adjusted upwardly above the pivotal axis of said rock-lever 40 69, it is evident that the rocking movements imparted to the anchored rock-lever upon endwise reciprocation of the main feed-bar 42 will be transmitted to the auxiliary feed-bar 55, whereby the auxiliary feed-dog 40 will have a greater 45 amplitude of work-advancing movement than the main feed-dog 39. Outstand'mg as an advantageous characteristic of the present differential feeding mechanism is the simplicity and sturdy nature of the con- 50 struction, aff orded by the direct connections of the main fe,-d-bar wi'ch the actuating si'iaft with. in the work-arin, and the described rock-lever and link col'inections with the aux.Uiary feed-bar. Furthermore, the present differential feeding 55 mechanism is particularly well adapted for embodiment in a feed-off -arm machine having a work-arm and a carrier-arm for the work-arm arranged coplanar, whereby the feed and looptaker actuating shaft may be advantageously dis- () 0 posed and driven in the maiiner herein described. I-Iaving thus set forth the nature of the invention what I