US2333438A - Loop-taker and feed-actuating mechanism for sewing machines - Google Patents

Description

F. PARRY @My i;

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LOP-TAKER AND FEED-AGTUATING MSCIMNISMSl FOR SEWING MACHINES Filed April 11, 1942 Nov. 2, 1943.

F. PARRY 2,333,438

LOOP-TAKER AND .FEED-ACTUATING MECHANISMS FOR SEWING MACHINES Fiied April` 11, 1942 3 Sheets-Sheet 3 ll #I vPatented Nov. 2, 1943 f fr '5a Y me LOOP-TAKER AND FEED-ACTUATINGMECH; f ANISMI-FOR SEWING MACHINES Frank Parry, tBridgeport, Conn., assignor'torThe Singer Manufacturing Company; Elizabeth,

N. J., a corporation of New Jersey y j Application April V.;11, 1942, serial No; '438,516

11 claims. '(01. i12-215) This invention relates to sewing machines and has for an object to provide a sewing machine with loop-taker andk feed-actuating mechanisms capable of operation at high speeds with a minimum of vibration of the sewing machine;

Another object of this invention vis to provide improved loop-taker and feed-actuating mechanisms adapted for sewing'machines having a work-supporting arm of the lcylindrical bed type, and in which the work isl fed crosswise ofthe Work-supporting arm.. Other and and more speciflc 'objects of the invention will be apparent from the following description and claims.

The invention comprises the devices, combinations and arrangementsof parts hereinafter described in connection with the accompanying drawings, which illustrate a preferred embodiment of the invention and in which: y

shaft I5 suitably connected to impart endwise reciprocatory movements toI ai vertically disposed needle-bar I6 carryingatjitslowerend an eyepointed needle I'l. Also supported bythe bracketarm 'head I4 for endwise movement vvis the usual vertically disposed and spring-depressed presser-Y bar I8 carrying at its lower end a preser-foot Complemental to theneedle I'I, in the formation of lock-stitches, isa lrotary,loop-taker 2l] of the horizontal-axis rotary hook type disposed within the work-arm I'I at the free end thereof. The loop-taker rhas acylindrical side Wally 2| and an end wall-22 from which extends a reduced hub 23 having a shaft-aperture24.clos'ed at 'the inner side of the end wall 22 by a disk 25 set into the end Wall 22. *The side Wall 2| of the loop- Fig. 1 is a front elevation, partly invertical section, of a sewing machine containing the present improvement. Fig. 2- isY an enlarged front end elevation of the Vwork-arm of themachine,A

6 represents a transverse section of the work-arm4 on substantially the line 6 6 of Fig. 3,'and illustrates the feed-advance rocker. Fig..7,. representsl a transverse sectionv of thework-arm onsubstantally the line 'I-l of Fig. 3', and shows the feedbar in elevation. Fig. 8` is` a Vtop-plan of the work-arm broken away from its supporting base;

the throat-plate'and cover-plates being removed from the work-arm and the work-arm'end-,cap-

being shown in section.

As illustrated in the drawings; the sewing. ma-A chine has a hollow supporting base III. fromV which extends a horizontally disposed work-supporting arm II of thecylinder-bed "type having a free outer end; said Vwork-supporting arm being preferably integral with-rthe'base'l'll.' Rising' from the base I0 is the hollow standard I2 of a bracket-arm I 3 which terminates atits freeend in a head I4 overhang-ing the free end of the work-arm II. u

Rotatably journaled the vbracket-arm "I3 visA a .horizontally disposed rotary actuating or main taker is partly cutaway to provide a needlethread loop seizingbeak 26; said side wall 2| being also internallyl grooved circumferentially to'provide a raceway 21. Journaled in the ,raceway 21 is the peripheral bearing-rib 28 of a thread-carrier 29. The thread-carrier 29 houses the usual thread-case 30 which contains a mass of under thread about which the needle-thread loops are cast bythe loop-taker.W The thread-` carrier 29 is restrained .againstyrotation with the loop-taker and to that end the thread-carrier is provided withvthe usualstop-notch 3| entered byaY stationary stop-lug 32. The stop-lug 32 extends from an angular stop-member 3.3Jsecuredby screws 34Yagainst theendv face ofthe work-arm I I. The hub-aperture V24has the usual lubricant-conducting connections with the race.-Y way 2T; said connections comprisinga radial duct 35 formed in the -endl wall 22 of the looptaker and open to an axially extending duct 35 in theloop-taker side wall2I. n

The hub 2 3 of the loop-taker is secured by screws; vas v3l, upon the reduced end of a `horizontally disposed *loop-taker shaft v ?I'extfending lengthwise of the work-arm II The endofthe shaft 38 is.A preferably spaced from the4 disk b25 of the loop-taker end wall, thereby to,1provide the loop-taker with a lubricant-collecting cavity kbeyond the"end"'of 4 the shaft and opento the radial duct 35 which is connected withthe looptaker raceway. n Y

l As illustrated more particularly in Fig. 3 of the drawings; the loop-taker shaft .38 is rotatably journaled in a needle-roller bearing VY39 disposed directly adjacent the hubu23 ofthe loop-taker, whereby the shaft 38 is adequately supported close to the loop-taker. The roller-bearing 39 is dis-l posed within and carried by'a bushing lll having the longitudinal shaft-opening thereof slightly larger, diametrically, than the shaft 38, wherebelt-pulley 41 carried by the main vor bracketarm shaft I5. The pulleys 45a1j1di I1l are proportioned so that the loop-taker-shaft 38 "rotates twice for each rotation of the main shaft I5, and

the `loop-taker `shaft 38 is located in the workarm so that the axes of rotation of the shafts l 5 and 38 are disposed in a common vertical plane. Between its` ends, the loop-taler shaft 38passes freely through a bushing, 4&secured. by-a4 screw 49 in another transverse wall` 50 of theworkarm; said wall 50 being located at. the. juncture of the ba'segl. andwork-arm II. A collar 5I. is.V secured upon the shaft :38 to. engage one end of the bushing, thereby 'to restrain said shaft against endwise movement in one direction.

-.The work is advanced. across. the work-arm- I I by a drop-feed feed-dog'52, operating through a suitably slotted and flattened portion of a throat-plate '.53 having a needle-aperture 5ft.; said .throat-plate having segmental. wings secured *by screws upon the curved front and rear .walls of the work-arm-` The feed-dog. 52 overhangs the loop-taker 2.0 and is secured by screws 53 upon the upper end of an upright feed-bar 51 havingy a clearance opening, 58 for the end portion of the bushing 40 which supports the roller-bearing 39; saidfeed-bar 51. being disposed directly adjacent. to the loop-taker hub 23 and at the. side of the. loop-taker opposite the: free end. of thefwork-armn The lower end ofthe feed-bar 5.1. has. a horizontally apertured split sleeveI 59 extending under the loop-taker 20 and clamped by a screw E0- upon a fulcru'm-pin. 6L which. lengthwise extends parallel to the loop-taker shaft 33. and is disposed vertically below said shaft. The opposite. ends. of the fulcrum-pi-n. 5I. are pivotally journaled in a feed-lift.v rocker compris-ing horizontally spaced rocker-arms: 62. and. 63; said rocker-arms` extending horizontally forwardly from and being carried. by one. end of a` feedlift rock-shaft 64A disposed substantially parallel to the loop-taker shaft 38. and rearward of the vertical plane containing the axis of. rotation of said shaft 38. i

The. feed-liftA rock-shaft. G4 is journaled. in a bearing-bushing 6.5 suitably secured iny an aperture. .in the transverse wallY l2` of the work-armv II. Adjacent `its opposite end, the rock-shaft 54 is journaled in a bearing-bushing 6B carried by `the transverse wall 50., Clamped upon the. end. of the rock-shaft 64, thebasell, is the split hub of ar depending crank-arm.. El. crank-arno-V SI isv pivotally connected,` in` any suitable manner, to one end of. a pitman 68 ha-vinga strap embracing a feed-lift eccentric (i9 carried by a primary feed-actuating. shaftv` 10; the .pitman 6.8. extending rearwardly and. upwardly from said shaft.A the v pitnianstrap may directly embrace the. eccentric. 6.9, it. is preferred to'interpose therebetween a. needleroller bearing TI, inthe manner as. illustrated more fully in the U. S. patent to S. Zonis, No. 2,267,581, dated December 23, 1941.

The feed-actuating shaft 10 is lengthwise parallel to the main shaft I5; one end of said shaft Ill being rotatably journaled in a bearingbushing I2 suitably secured in the lower portion of the Work-arm transverse wall 55. The opposite end of'. the shaft 10 is journaled in a ball-bearing 13 supported in a wall T4 connecting the front and rear Walls of the base Ii). Adjacent the ball-bearing 13, the rotary shaft 10 carries a belt-pulley 15 connected by a clipbelt 16 to,- a pulley 11 carried by the main-shaft I5; said belt I6 extending through the bracketarm standard I2, and said pulleys 15 and 11 -beflng'proportioned so that the shafts I5 and 1U rotate in one-to-one relation. The feed-actuating shaft 10 isv disposed vertically below the loop-taker shaft 38; the axes of rotation of the main-shaft I5, loop-taker shaft 38 and feedactuating shaftv 1i!vr being all disposed in a common vertical plane, Y

The feed-actuating shaft N1 also carries a` feed-advance eccentric 'I8 which `is adjustable as to eccentricity and is. constructed substantially in accordance with. the feed-advanceeccentric disclosed. in the U. S. patent to W. Myers, No. 2,128,031 dated AugustY 23,. 193B. In. the pres-I ent instance, as illustrated in Fig.. 4 of the. drawings, the means. employed for manuallylocking the adjusting, memberof the. feed-advance eccentric I8 while effecting adjustment ofsaid eccentric comprises al spring-retracted plunger-rod'. 119 supported` by the front wally of the base I0 for endwise. movement.

The feed-advance. eccentric. 1.78.r is embraced by the strapl of a pitman. extending forwardlyin an upwardly. inclined .direction,. from the feedractuating shaft 10, Preferably, a needleroller bearing. all" is. interposed between` the-'pitman-strap andthe eccentric asf disclosed irrtheA above mentioned Patent. No., 2,26%,58-1.. The4 pitmanf'll is ypli/Totally connected., inf a suitable mannen-to a crank-arm Bft-having a split hub1 clamped. uponone. end of a feed-advance. rock;-

shaft. 82 ldisposed vertically below and parallel to Vthe.I0o1 J-tal' er shaft 38. so. that` its, rocking axis. is also contained in the vertical. plane: .containing the rotation axes, of the shafts. I5, 3% and 1.0i.. This arrangement. of the several shafts referred to lends .itself to high speed operation. of the machine, asi vibration is thereby reduced to a minimum.. v

Adiacent the crank-arm` 8|.,` the feed-advance rock-shaft 82r isjournaled iny a bearing-bushing. 83 secured in the transverse wall 50. of the.l work.-- arm` I.|. Adjacent its opposite end, the rockshaft 82 is journaled in ay bushing 84 suitably secured in the. work-arm wall 4-2. Beyond. the-wall 42', the end; of the. rock-shaft 82 carries an upright feed-advance.' rocker 85 disposedr closely ad'-4 jacentto thewfeed-bar 51 and atthe side. of said feed-bar opposite the loop-taker side.- thereof. The, feed-advance rocked 85v is formed w'rtlr an openingy v`8d therein, affording` clearance for the: loop-taker.v Vshaft supporting bushing 40; At'itsupper end, above the bushing 40, theI feed-advance rocker 85.isfforked tov provide an upwardly` open.` rectangular guideway 81 irr which. is. slidably disposed a pivot-block 88. The' pivot-bloei; 88. is apertured. toreceive ay pivot-pin; 8a extend-- ing.. horizontally from the. feed-bar 51. The forward and return movements thus impartedtothe feed-bar 51- by theI feed-advance rocker. 85: are coordinated'y with. the rising. and falling move.-

ments imparted" to said feed-bar Yby the-feed- lift rocker 62, 63 to transmit operative work-advancing movements to the'feed-dog 52. f

The described -compactly arranged feeding mechanism lends itselfy to locationof the feeddog 52 -close to the free end of the work-arm without interfering with removal from the vlooptaker 20 of the thread-case 30 for thread' replenishment purposes. ertheless, adequatelysupportedat the front and rear sides of the loop-taker shaft 38 and is actuated to minimize tilting of the feed-dog-with respect't'o the flattened upper face `of the throatplate 53.

A segmental end-cap 90 is removably applied to the work-armv to enclose thelower and front endV portions thereof; the end wall of said endcap having an opening 9| to provide for removal of the thread-case 30 without requiring removal vof the end-cap. The base of themachine is preferably supported by a sub-base 92 of any suitable-height. As illustrated in Fig. 5 of the drawings, ythe transversewall 42 of the work-arm is provided at the rearward side thereof with an upwardly 'open and forwardly inclined lubricant-pocket or primary reservoir 93; the open or upper end of the reservoir 93 being disposed below and spaced from the flattened portion of a cover-plate 94removably secured by screws 95 upon the work-arm 4 wall V42. Between the cover-plate 94 and the throat-plate 53, another and similarly shaped cover-plate 96 is detachably secured by screws 91 vupon the work-arm I I to provide for access to the feed-mchanism-disposed below said coverplate 96. Lubricant may be supplied'to the reservoir 93 through an aperture 9S providedfin the cover-plate 94. Y

Disposed in the reservoir 93 and extending from the open upper end thereof to terminate 'in a cavity 99 in the upper face of the work-arm wall 42 is a lubricant-conducting wick |00. Adapted to engage the end of the wick |90 in the wall-cavity 99 is one limb of a bent connectionwick |0|, of which the other limb extends downwardly through a pivot-sleeve |92 free for turning movement in a vertical aperture formed in the wall 42. The pivot-sleeve |02 is provided with a short crank-arm |04 extending horizontally beyond the edge of the cover-plate '94, whereby the pivot-sleeve |02 may be manually turned at will to shift the connection-wick 19| into and out of engagement with the wick |09; it being understood that the connection-wick |0| is packed into the pivot-sleeve |02 for turning l movement therewith. The lowerV end of the connection-wick |0| extends downwardly from the pivot-sleeve |02 through a radial aperture |05 in the bushing 40, thereby to deliver lubricant into the shaft-opening 40? of the'bushing 40. i

Within the bushing 40, the loop-taker shaft 38 is externally provided-with a spiral lubricantimpelling thread |06 disposed directly below the bushing aperture and leading to a' radial aperture |01 in the shaft 38. `The shaft* 38 is additionally provided with an oppositely spiralling lubricant-impelling thread |08 at the opposite side of and also leading tothe shaft-aperture |01. The shaft-aperture |01 opens into a longitudinal bore |09 of the shaft 38; said bore being open at the end of the shaft within the hub 23 of the loop-taker. f

The wick |00 serves'to feed-lubricant from the reservoir 93 to the connection-'wick |0| when said wicks are in contact with each other. The

The feed-dog 52 is nev` wick lul reeds theiubricanc into the bushing an;

andthe spiral thread |06 impels the lubricant, thus supplied thereto, lengthwise of the shaft 38 to the shaft-aperture |01. The counter-spiralling thread |08 guards against 'escape of excess lubricant from the end of the bushing 40 adjacent the loop-taker, while permitting a modicumv is provided in the wall 42 and connects the bush-y ing-hole 4| with a supplemental lubricant-reservoir H3 comprising an upwardly open and substantially vertical pocket formed in the wall 42 below the cover-plate 94.

Extending from and through a side wall aperture of the supplemental reservoir H3 is a lubricant-conducting wick H4 having the opposite end thereof entering a radial aperture l5 of the feed-lift rock-shaft 64 beyond the end of the bushing 65. The radial shaft-aperture H5 opens into a longitudinal bore of the shaft 04, through which shaft-bore lubricant is supplied 'to additional radiall ducts H9 of the shaft 64 within said bushing .65. Another wick H1 extends, from the supplemental reservoir H3, through'a side wall aperture of said reservoir and into the open end of a longitudinalbore H8 of the feed-advance rock-shaft 82; said bore H0 ported in an aperture of the work-arm wall 50.

to extend horizontally from said wall. An aperture of the tube |2| is connected by suitable ducts, provided in the wall and in the bushing 12, with the bearing`aperture 12 of said bushing 12; said bearing aperture 12' being closed at the work-arm side of the bushing 'l2 by a suitable plug |22 spaced slightly from the end of the shaft l0. Theshaft 10 is provided with a longitudinal bore |23 and with suitable radial apertures connecting'said bore with the needlebearings 1|, 80 for the pitman straps embracing thefeed-lift eccentric 69 and the feed-advance eccentric 18.

' From the foregoing description, it will be understood that when lubricant is ysupplied through the aperture 98 of the workarm cover-plate 94 to the primary lubricant-reservoir 93, the lubricant rising in the resi lubricant-conducting connections with the bore- |23 of the-feed-actuatingy shaft for delivery to the needle-roller bearings 'H and 80. 1 .l

lThe base lo is internally provided with anv 011- rotary arm-shaft journaled in, said bracket-armi.

av loop-takerv shaft rotatablyl journaledt below said work-support, driving connections with, said: arm-shaft for rotating said loop-taker shaft a plurality of times for each rotation of said; arm-l shaft, a feed-actuating shaft journaled below; and in. spaced relation to said loop-taker, shaft, driving connections with said; arm-shaft independent of the loop-taker shaft driving connectionstherewith for rotating said feed-aotuatingshaft. once for each rotation of the arm-shaft said arm-shaft, loop-taker shaft and feed-actuating shaft having substantially parallely rotation axes disposed in. substantially the same plane, a workadvancingy feed-dog operating throughv said work-support, and connections with said feedactuating shaft for imparting operative workadvancing movements tosaid feed-dog.

2; Ina sewing machine, having; a frame including a work-support, in combination, sub,- stantially parallelY loop-takerv and feed-actuatingr shafts rotatably journaled below said work-sup.- port, a feed-advance rock-shaft journaled below said work-support and having its longitudinal axis in substantially a vertical plane containing' the axes of rotation of said loop-taker and feedactuatingl shafts, means for rotating said looptaker and feed-actuating shafts, means for' actuating said rock-shaft from said feed-actuating shaft, a work-advancing feed-dog operating through said work-support, operative connections with said rock-shaft for imparting workadvancing and return movements to said feedl dog, and meansfor imparting rising and falling movements to said' feed-dog. r

3; In a sewing machine having a frame including a work-support, in combination,- aloop-taker shaft; rotatably journaled below said work-support a feed-actuating shaft rotatably journaled vertically below and in spaced relation to said loop-takervshaft, driving connections for rotating said loop-taker shaft a plurality ofA times for each rotation of said feed-actuating shaft., a feed-advancing rock-shaft disposed between and substantially parallel to said loop-taker and feedactuating shafts, said three shafts having their longitudinal axes disposed in substantially the same vertical plane, means for actuating said rock-shaft from said feed-actuating shaft, a feedlift rock-shaft dispo-sed below said work-support and substantialiy parallel to said feed-advance rock-shaft, means for actuating said feed-lift rock-shaftl from said feed-actuating shaft, a feeddog operating through saidwork-support, and connections with said rock-shafts for imparting operative work-advancing movements to said feed-dog.

4. In a sewing machine having a frame includingv a work-support and a bracket-arm overhanging said work-support, in combination, a rotary arm-shaft journaled in said bracket-arm, substantially parallel loop-taker and' feed-actuating shafts rotatably journa-led below said work-supsont; a.' freed roolsfshatt iournalied' below said Work-:support and disposedl substantially parallel to said arm-shafii'f,l said fourI shafts having; theirlongitudinal axesin substantially a; commonvertical plane, driving connections for rot-ating said loop-taker shaft in, two-to-onex and said feedactuating, shaffi; inv` one-to-onerelation to; said arm-shaft',r meansfor, actuating said rock-shaft from said feed-actuating@b shaft, a work-advancing feed-dog, and means including operative connections with said, rock-shaft for actuating said feed-dog fromsaid ieed-actuatmg shaft.

5. In a. sewing machine having a frame; including a work-support and a bracket-arm overhanging, said; work-supporty` in. combination, ,a rotary-arm sha journaledin said bracket-arm, a rotary` loop-taker4 shaftl journa-ledf below said work-support, arotaryx feed-actuating shaft journaled verticali-yl below and in spaced relation to saidl lomo-taller` shaft; driving connectionsv forrotating said loop-taker shaft in two-to-one and saidfeed-actuating shaft in one-to-onvefrelation to said arm-shaft, a feed rook-shaft disposed between and substantially parallelto saidfrotary loop-.taker and feed-aotuatingy shafts, said four shafts having their longitudinal axes disposed insubstantially the same vertical plane, meansA for actuating. said rock-shaft; from saidfeed-actuating shafta work-advancing feed-dog?, and meansincluding operative: connections` with said rockshaft for actuating said feed-dog from said feedactuating shaft.. 1-

6. In asewing machinel having a frame including a. Work-support,- inv combination,v a loop-taker shaft rotatably journaledi belowy said work-support, a rotary feed-actuating shaft journaledbelowand spaced vertically from said loop-taker shaft, driving connections for rotating said looptaker shaft a plurality ot times for each rotation of said feed-,actuatingshaft, a pair offeed rockshafts disposed below said Work-support and substantially parallel to said rotary feed-actuatingshaft, one of said; rock-shafts having its longitudinal` `axis in a vertical lplane containing. the axes of rotationA of said! loop-taker and ,feed-actuating shafts, connections with` saidfeed-actuating sha-ft for actuating; said` rock-shafts, a work-advancing feed-dog, and operative connections with said rock-shafts. for actuating said feed-dog.

7. In a sewing machine., having a frame ineluding awork-supportanda bracket-arm overhanging said Work-support,l in combination, a rotaryarm-shaft journaled in4 said bracket-arm, a rotary loop-.taker shaft journaled below said worksupport, a; rotary feed-actuating shaft journaled vertically below and in spaced relation to said loop-taker shaft, said three rotary shaftshaving substantially parallel rotation axes disposed in a substantially# common verticalpla-ne, driving connections. for rotating; saidl shafts,A a pair of substantially parallel; feed rock-shafts journaled below said work-support, one: of said; rock-shafts having its longitud-ina-lI axis in substantially saidv plane,` mean-s for actuating said rock-shafts from said rotaryl feed-actuatingshaft, a work-advancing feed-doa, and operative; connections withV said, rock-shafts for actuating said feed-dog.

8. In, a. sewing machine having a frame including a hollow base: and, a work-arm of the free-end type; extending from said base, in combination, a loop-taker shaft rotatably j ourna-led in said`r work-arm and extending lengthwise of said work-arm into. said baser,4 a loop-taker carried byV said shaft. atx the: free end portion of ftions, With sai feed-(10g.

gitudinal .axes in` substantiallyfthe saine vertical plane; a crank-arm 4 carried by said rock-shaft "within saidl base;I an [eccentric carried by said "feedfactuating shaft, a- ;pitman connecting 'said eccentric and crank-arm, a second., feeds 'rook" 1 shaft journaledin said'WorkarmA Aat one side ,vof saidplane and lengthwiseiextending ini-,o .said

ibase, connections with *said feedakztuatin'gv shaft l'for actuatingfsaid second rockshaft a` Work- .,.'advancingfeed-dog.disposed at the free end p0r- `tion of rsaid Work-arm, andgopeifative` connec'k d rockshafts forzgaotuating. said bination, a'loop-taker shaft rotatably journaled" ngyrnachine. having a fraInej'inV vcluding a h ollovv base and`;-a Work-:arm ofthef rfree-end type extending .from said base,` in cornf Said Work-arm; a feed-actuating, shaft rotatably journaled inI said hase,v driving connections for. .jv -r'otatingsaid shafts, afeed rockshaftjo1irna1ed f in andl extendinglengthvvise'ofV saidWo'rk-frn jintosaid base,`s a id loop-taker shaft,v feed-'actuating shaftand rooki-shaft havingtheir lonin and extendinglengthwise4 ofzsaid work-arm` #finto said base, a loop-'taker carried bysaid shaft zat the -free end portion fof -said Work-arm,- a feed-actuating shaft` rotatably vjoiirnaledf in said "base, driving connections forrotating said loopv taker shaft a plurality of times for-eachrota-- f tion'.v of said feed-actuatingv shaft, ya-Vfeed-adjg.; vance rock-'shaft jonrnaledin'and extendinggj J lengthwise *ofvv said work-arm into'. said base, ysaid three `shafts having substantiallyA parallel longitudinalraxes disposed in s'libstantially the same vertical plane, a. feed-lift rock-shaft;V extending r`lengthwise of" said `Work-'arm int'o said base',di j v.v'efr'gentLcrank?arms carried ley'y vthe respectivev l feed-rocks-shafts, feed-advance and feed-lift eciv f y centrios carried byy said "feed-actua'tingi shaft `v`Within said base, pitmans "connecting said eccen-'g ,Ytrics with 'said crankf,arms,.va work-advancing. Y @feed-dog" disposedat thefreek end'fpor'tionofiyv said Vworkarm,. "'and operative connections with 4 said rock-shafts for actuating 1 said feed-doa u -10. `In ar lsewing machine, 'i n combinatiorna 'Y f horizontally disposed-rotary loop-taker shaft, a 'loop-take;` carriediby oneend of'said shaft, a y

Bof

substantially in'a vertical plane`V containing the axis ofrrotation vlof'said'v160p-.taker shaft; means. Vf s n 'for lactuatingsaid feed-advance rocker, a'ndfcon' neotionsiwithsaid feedadvance rocker `for' im?v parting work-advancing f and return" 'movements tO'Saidfeed-dQg.

feed-loar'vertically disposed` adjacent-said lloopg takerandA having a 'loop-:taker-sliaft clearance opening, a lfeed-'dogextending laterally fro'rn 7 `Y said feed-bar andgoverhangingsaid looptaker ,f

a feed-'lift rocker'lp'ivotally supporting saiolfeedv l bar for movexneritfof :said feed-bar abolitfanakis' l u rocker having-.its rocking'axis substantiallyin a` n vertical plane containing `the ,axsfof rotation 7 of saidllooptaker shaft, rneans foractuatingsaid feedadvance1"fJ'o l:er, connections Withsaid feed-' advane frockeipforlroekingsaid feed-bar; andan` "hearing for' said loop-takerA vshaft* extending v .throughz saidshaftclearance openings of. said Vfeedlidar andlyffeed-advance Vro "fccmbnvatllfa Y nhorizontallyidisposed] rotarylooptakerfshaft;. v loolintal'ercarriedl by one I[endg ofsaidshaftf a 'tubular bearing-support; an antifrictionfbearing in 'said bearingsupport for said loop-#taker shaft,` said antifriction hearin'gtbeing disp'osed'inclose proximity tofjsaidfloop-taken a@ vertically; dis posed fet-:dloar'enobr-a'ein'gl said antifriction bear'. ingl and havingy a-'clearance opening forf-I'said i loearing-support,l a i f d-dog supported/,by said feed-doar and overhanging saidzrotary loop-taker', va; pivotal?v support i. for said' feed-bar belovvfsaid loop-taker shaft'and providing for movement' lof saidA feed-bariabont an axis ,substantially par-- -allelto 'the aXisof rotation of said loop-taker shaft;` means for .aotating said pivotal- Support to impart'rising;andfallingmovementstosaid i feed-dog', a feige'dfadvancerocker' disposedadjaff cent said 'feed-bar and havingl Fits rocking axis

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