US946662A - Feeding mechanism for sewing-machines. - Google Patents

Description

A. H. DE VOIE?.A FEEDING MEGHANISM POR SEWING MACHINES.

APRLIGATION FILED MAY 1s. 1909.

946,662. Patented Jan.r18, 1910 2 SHEETS-SHEET 1 5 2|:

[(i l/ By M mm www ATTORNEY Y A. H. DE VOB.

FEBDING MECHANISM POB. SEWING MACHINES.

APPLICATION FILED MAY 18. 1909. 946,662 Patented Jan. 18,1910.

2 SHBETB-BHEBT 2.

A.fUrnfrEp srArEs PATENT oEEicE.

ALBERT H. DE VOE, 0F ELIZABETH, NEW JERSEY, ASSIGNOR T0 THE SINGER MANU- FAGTURING COMPANY, A CORPORATION OF NEW JERSEY.

'FEEDING' MECHANISM FOR SEWING-MACHINES,

Specification of Letters Patent.

Patented J an. 18, 1910.

Application filed May 18, 1909. Serial No. 496,803.

To all lwhom-fit may concern:

Be it known that I, ALBERT H. DE Von, a citizen of the United States, residing at Elizabeth, u the county of Union and State vof hcw Jersey, have invented certain new and useful Improvements in Feeding Mechanism for Sewing-Machines, of which the following is a Specification, reference being had therein to the accompanying drawings.

This invent-ion has for its object to provide differential feeding mechanism for use particularly ingathering or shirring fabrics, which shall be effective in operation and conveniently adjusted for use in different classes of work.

In its preferred embodiment, the mechan-v ism -comprises a primary feed-bar and a work-engaging, member fixed thereon, the feed-bar being pivotally connected with the usual upright arms upon the feed-rock-shaft disposed at the rear side of the machine paralle] with the main-shaft to which it is conne'cted by means of a crank-arm and yoked link-bar embracing an actuating eccentric upon the main-shaft and provided with a roller-stud moving in a run-Way of a feed regulating lever pivotally mounted upon the front of thefmachinc ywhere it is readily accessible to the operator. `Slidingly mounted upon the primary feed-bar is the secondary feed-bar-carrying an independent. work-eugaging member and connected by means of a pit-man with a crank-arm at one end of the secondary feed rock-shaft disposed at the front of the machine parallel with the mainshaft and having a second slotted crank-arm to'whichis adjustably connected the forward end of a link whose rearward end is pivotally connected with a crank-arm upon the primary feed rock-shaft from which the secondary feed rock-shaft thus derives its operative movements. Opposed to the differ-1 enti ally moving primary and secondary feeding members is a three-part presser-footpf which the relatively yielding forward and rearward parts are opposed to said feeding members,` respectively, an intermediate relatively yielding portion being adapted at certan times torest upon the work-plate intermediate said feeding members to insure the 4detention of the fulled material thrust under the presser-foot by the secondary feeddog for the stitching operation.

The present invention includes certain details of construction whichwill be hereinafter described and pointed out in the ap# pended claims.

ln the accompanyingdrawings Figure 1 is a front side elevation of a sewing machine embodying the present improvements, and Fig. 2 a plan of the same with the bracketarm and work-plate removed. Fig. 3`is a perspective view of the feeding mechanism detached. Fig. 4 is a perspective view of a portion of the feeding mechanism and the compound presser-foot. Fig. 5 is a perspective view of the presser-foot det-achedand Fig. (S a sectional elevation of the same.

The machine frame comprises the base 1 from which rises the upright portion 2 of the bracket-arm with ovcrhanging portion 3 in the head 4 of which is journaled the reciprocating needle-bar carryingthe needles 6 mounted in the twin needle-clamp 7. rPhe needle-bar is provided with the usual collar 8 connected by means of thelink 9V with the crank-arm 10 near the forward end of theneedleactuating rock-shaft 11 provided at its rearward end with the lcrankarm 12 connected by means of the yeccentricrod 13 with the actuating eccentric upon the main-she ft 14. Coperatirig with the needles C are the two rotary single-chaiii-stitch loopers 15, one being mounted upon the maiushaft 14 and the other upon a short. shaft. 1G

connected bv gears 17 and 18 with the interf 'with the yoke 30 and at its forward end with a roller-stud 31 entering the run-way 32 in the hub portieri 33 of the feed regulating lever 34 which is fulcrumed, by means of the pin 35, in a bracket-piece 3G extending from 'the base 1 at the front side of the machine.

The lever 34 is formed with a segmental slot. 37 concentric with its fulcrum-pin 35, said slot beiner entered by a stud 38 projecting from thelbracket-piece 36 and provided with a clamp-nut 39 by which the lever 34: may be secured in position. The main-shaft ioperatiyeinoye Y14 has fixed thereon the feed-actuating eccentric'40 embraced b y the slide-block ing a downwardly odset orward or toepor 41 tion 69 with upturned forward extremity,

provided upon opposite sides with slidethe toe portion beine disposed immediately ways which are/entered between the parallel abovetlie secondary eed-dog 48 which, with sinembers of :the yoke 30. Y.Although the ac the primary feed-dog, is adapted to rise tuating member 40 is shown inthe drawiii termed an eccentric, it is evident thatits ing mechanism is disposed.

function is merely ,that ofythe cani, such par- Within the bottom recess of the foot-plate t10ll11. form-belngldlpted-thefef01` as may 68., and immediately above the pri mary best Sllt itSPW-'POSe like Performance 0f feed-dog 22, is disposed the yielding heelthe work for wliiclithe ,machine is designed.

The primary. feed-bar 23 is provided with jects Athe =cylindrical post f7 through. suit` late 1 fromtheupper face of which proa forwardly projectingyoke 42 which emable'apertures in the feed-piate and a fixed aipon themain-shat.

y braceathe:feedlftingmlli 01' GCCGIIIC 43 vbearingdlug 73 extending forwardly from the iipper end ofthesliank 6T.A ,The heel` "The Primalyfeedabarsection 23is.fornied plate 71 is provided wtha steady-pin 'Z4 in 0119 fafwlllglflgitudnal Channel Wth- ,entering an aperture in thelower lpart of in which is-slrdfrngly fitted the reduced adthe lshank 67, andinterposed :between the 20. jacent endportion or' the secondaryfeed-bar to of the heel-plate and the upper ends of 44 towhoseforwardend is adjnstably cured, by. means of the fastening screw sesuitable sockets in the feed-plate arey springs 45 75 tending to press the'heel-plate down- -entering thevertical slot 46 in the feed-bar, wardly into a position 4substantially flush the shank 474 of the` secondary eed-dog48 with the toe portion of the foot in which having its several feeding surfaces disposed position it is normally held by means of the inlsubstantial .alinement with -those oi' the stopt-collar 76 secured to the upper endof :The rearward end the post above the bearing lug 73 by means Iolf the secondary. feed-bar 44 is provided withf of the` transverse pin 7 7 a lateralstud-screw 49 embracedby one end 30 of. the bent link` 50 whose opposite end emface of the footplat e (38, and iiisadvance of Disposed within the recess in the lower braces thelstud-,screw 51 carried by the up- ,the heel-plate Tl, i:`,the auxiliary pressure vrightrank-arm 52 at one end' ofy the Secor detaining niemberiS with upwardly and i 'ondaryfeed rock-shaft 53 having fixedupon rearwardly vinclined lower or operative face.

itsoppo'sitend. the,.upi ight crank-arm 54 This intermediate member is provided with i .formed Y with. the slot 55,

a shank 79 secured by means o fastening Vlhe primary feedrrockshaft 26 is provscrews 80 upon a block 81 ,cent rally`aper 11 videdwithaiiiipwardly:extending c rankarln turedtofit the postlQ intermediate the foot- '56.carrying:astud-screw 57 ,e'mbraced the plate 68 and bearing lug 3, a. spring S2 beffiaearwardaend oi thel curved link 58 whose ing interposed between the saidbearing lng 4Q. -i'orwardfieiidisiproyided lwthwthe flanged. andthe top ot' the block S1 to force the lower busliingfientered 'by the .bolt GOhaving the end of the latter downwardly Aupon a seat S3 ahead,lfandadjacent lattedlsliank 469 fitted, afforded therefor upon the topV of the foot-- i withintheslot 55 of theJicrank-arm'l, the. plate 68. The shank Tilis so o tset later- ,parts'beingssecured together ,in a manner allyv adJacent tlieinember 78 that it is adapt- .to tlie-A reduced ,threaded end portion of the,

15x-well known by. nie aansol theiiut tappled-I ed to be engaged by the top of the heelplate 71 when the` latter riSesSuHicieiitly to holt G0., By thezmeans,justtdescribed it -wll take up the 'clearance which is normally probeeobservcd that thesecondaryv feed-degl vided. betweoir such parts. T 'The pressure -i 4.derives itsoperative.movements through adlmeinber 7S is so disposed -in relation to the justnhleconnections with vtheprimary ,t'cedl ldifferentially moving feed-dogs that in the mock-shaft,.whereby asingle adjustiiient. ot` linitial rising movement the `main oi the feed regulating lever 34 causes a proporprimary feed-dog it forms a relativelyjield -,-.,t`ionate,ladjiistnient of theoperative move-A ingcontnuationot the heel-plate, being arl ,qinents oi, the primary -and secondaryjeedranged directly abovesuch feed-dog, but a:

Y. inglink 5S givitlivl the slotted crank-arm 54v work a stitch length, them 5;dogs,wliile, tlie ad]iistinent of tlie connoct ithe feeding members advance for moving th ainfeed-dog re -piodncesa rclativexadjustnieiit between the eedes from beneath the member 7S inentS Q f the two .feed-dogs.

Y which latter is permlttedto drop' toward th :Tnvthe head 4 of the bracket-arm isgourworlg-platejus't in' advanceof the positioi hnaled thelusual.presser-bar (i4 embraced by: which theadja'ceiit end ofl the `secondari the `presser-,spring:65.by which it is normally.l ifeed-dog assumes at the end of the feedin ;.piessed downwardly. The reduced lower movement of: the latter.

As will be ol;

. fend ofl the presser-bar 64enters the usual: served, the operative edge of lthe pressui socketGG of .the pressenfoot` shank 67 formed `meinberr 7 8 adjacent therearward 'end' ot tl i -witli ,a laterally extending footfplate- 68V havg through the usualveed-dog apertures in the` of circular form and is herein -specifical y work-plate beneath which the feed-actuatbersbeneath the Work-plate, to nip the gathered material just deposited beneath the -ber 22', it will be observed that its front edge affords an abutment-rearward of the needle apertures 88 against which the folds or c rimps of fabric are thrust by the auxiliary feeding member 4S, in the crowns of which the needles descend, thereby dividing them each into two small crimps which are confined4 in position by the adjacent stitches.

lThe rearward-end of the toe-plate (39 is formed with a series of longitudinal slots 84, in which are disposed a corresponding series of serrated detent blades 85 fixed upon a rocking pin 86v which is seated in a transy'erse groove in the upper face of the toeplate 69 and held in place by means of a fiat spring 87 whose free .end presses upon the top'.of the central detent'blade, whereby said blades are pressed normally downward soas to extend beneath the lower operative face` of the toe-plate G9. These detent blades, which embrace the needle apertures S8 and extend both forwardly and rearwardly of the saine when pressed upwardly in opposition to the spring 87 in theii operation upon the fabric, serve to engage the fulled fabric propelled by the auxiliary feeddog and to prevent the disarrangeinent of the folds or crimps by maintaining a slight pressureV upon the same. against the workplate intermediate the feed-dog apertures when the feed-bardescends after each worh advancing movement.

In the machine shown in the drawings, in which the looper mechanism occupies almost the entire space beneath the work-plate adjacent the line of feed, it is impracticable to make use of such actuating connections intermediate the primary and secondary feeding devices as have been employed heretofore at the outer end of the machine, and the connection 58 has therefore been disposed in the present machine intermediate the stitch-.forming mechanism and the rear end of the machine Where theneedle-actiiat- .ing eccentric carried bythe main-shaft is lo cated. In addition to the advantage thus gained of locating this connection where there is ample room for its operation com-` bined with the necessary range of adjustment, the point of ad]ustment is brought close to 4the primary feed-regulating lever 34, so tliatbotli adjustments are closely associated together at a very farrable posi-I tion for manipulation bythe operator.

Having thus set forth the nature of the invention what I claim herein is 1. In a sewing machine, thecombination with the main-shaft provided with a needle-actiiating member, the work-plate and stitch-forming mechanism comprising a reciprocating needle-bar carrying a needle and an operative connection intermediate `said needle-bar and the needle-actuating member of the main-shaft, of a primary feeding mechanism comprising a feeding so member and an actuating rock-shaft disposed below and extending longitudinally of the work-plate, a secondary feeding mechanism comprising a feeding member disposed upon the same side of the workplate as that of the primary feeding mechanism and an actuating rock-shaft therefor also disposed beloi' and extending longitudinally of the work-plate, means for actuating the first-named rock-shaft, an adjust- 9o able connection between the said rock-shafts and arranged intermediate theI stitchforin` ing mechanism -and :the needle-actuating member of the main-shaft, and means for imparting simultaneous ,rising and falling movements to said feeding members.

2. In a sewing machine, the combination with the frame comprising the base and overhangiiig bracket-arm rising therefrom,

the work-plate mounted upon said base, the

main-shaft journaled beneath and extending longitudinally ot` the work-plate, and stitch-forming mechanism, of a primary feeding mechanism comprising a feed-bar, a

feeding member iixed thereon, an actuating rock-shaft disposed below the work-plate parallel with the main-shaft and provided intermediate .said feed-bar and the base of the bracket-arm with a crank-arm, a secondary feeding mechanism comprising a feed- 11o bar slidingly fitted upon the first-named feed-bai', a feeding member mounted there-V on, :in actuating rock-shaft parallel with the first-named rock-shaft and provided upon opposite ends with upwardly extending crank-arms, a link connection intermediate one of the crank-arms of the secondary 4 actuating rock-shaft and tliesecondary feedbar, a connection intermediate the crankarin of the first-named actuating rock-shaft and the second crank-arm of the secondary actuating rock-shaft, means connected with the main-shaft for actuating the first-named rock-shaft, and means for imparting rising and falling movements to the primary feedbar.

3. In a sewing machine, the combination with primary and secondary feeding ineinbers, riinary and secondary rock-shaftsdispose respectively at the rear and front ot the machine with which said feedinginembers are respectively connected, actuating means for the primary.rock-shaft includin a cam anda forwardly projecting yoke vibratoiy .link-bar -With means disposed at the front of tliemachine :for varying the path offmoveinent of said link-bar, crankarms upon'said rock-shafts, and a link connection intermediate said crank-arms and adjustable upointbe crank-arm of the sec` ondary rock-shaft.

4. In a sewing machine, the combination with the work-plate. stitch forming mechanism and differential feedingmechanism .anisin i a and r differential vfeeding .mechanism comprising.' two re1atively movable feeddogs .and -fmeans vfor imparting operati-ve movements-thereto,. of a presser-foot. coinprisingf. a. plurality. ot relatively yielding parts offwl'ncha.toe-plateand heel-plateale disposedaeachdaboveone of said xrelatively movable.feed-d0gs,and an intermediate part termediute.=tliepaths ofopeiative movementisfladapted'to -restg upon 4the. work-,plate inof :saidfecdedogsfsaid toc .plate being provided at its rearward end withspring- )ressed detent-blades normally extending low its o erative .face, and adapted to 40 engage -the f abrio .advanced Vby the "feeding member beneath the same. l

6. In a sewing machine, t-he combination rwith-the work-plate, stitch :formingmechanism -iucluding Ya, plurality of :laterallyr spaced needles, and .differential feeding mechanism comprising two relatively movable -feed-dogs ,andmeans .forimpartiiig operative movements thereto,` of va presser-'foot comprising a plurality. offrelatively yielding .pai-ts. ofwhidh a toe-plate and'heel-plate are disposed .each above one of jsaid .relatively movable :feed-dogs and the ...former is provided in its rearward4 portionw-ithaplurality of needle apertures,.and .,van intermediate presser-foot part is adaptedv to restl upoirthe work-plate intermediate y the paths 1 lof ,joperative movement. of said :feed-dogs,- g, said toe-plate vbeing providedatits .rearwardgend with springpressed detent.- blades embrac- 'e0 Ving Vsaid neet le apertures .andfnornially extending below its .operativeface.andyboth forwardly andrcarwardly of the said needle apertures for .engagement `with .sthcf fabric' advanced by the feeding member .beneath the same. l

In testimony whereof, .l 'have .:signed: iny name to this specification, in the presence of two subscribing witnesses.

LEER-T ll; DE VDE.

i lVitiiesses:

HENRY J: Minnen, Josemi, l". JaQUrrii.

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