US2147128A - Presser-foot for sewing machines - Google Patents

Description

Feb. 14, 1939. R; J. SAILER PRESSER-FOOT FOR SEWING MACHINES Filed April 27, 1957 grime/WM nudogah crsaizer WX/Gm Patented Feb. 14, 1939 r UNITED STATES PATENT OFFICE PRESSER-FOOT FOR SEWINGMAGHINES I Rudolph J, Sailor, Townley, N. assignprm'rhs H Singer Manufacturing Company; Elizabeth; N. J., a corporation of New Jersey Application April 27, 1937,. Serial Nog. 139.119 11 Claims. (01. in 235) This invention relates to presser-feet for sewingmachines and has for an objectto provide a presser-foot which is specially adapted to, co-

. operate with the feed-dog in uniformly feeding past the stitching mechanism heavy or. coarse material' haying'cross seamstherein, and to accommodate itself closely to the surfaceof the material so as to effectively control the same to preventthe skipping of stitches. at thecross- 9.. ams- I h It is a further object of the present invention tcprovide a presser-foot so constructed that it will readily ride over heavy cross-seams without presenting any obstructions which would tend to impede the feeding of the material and require the assistance of the operator in pulling on the work in rear of the sewing point.

Heretofore it has been customary, in presserfeet having two independent pivotally mounted work-engaging foot-sections in tandem arrangemcnt to incline or upturn the toe-portion of the rearward foot-section so that it will not act as an obstruction against which the cross-seams abut, but will function to tiltthe foot section and permit cross-seams to pass thereunder. In cases where the cross-seams are exceptionally heavy, si i c as encountered in the manufacture of overalls, windbreakers, etcl, the inclined toe-portion of the rearward foot-section offers considerable 1 is a side elevation of a sewing machine presser-foct embodying the invention.- p

Fig. 2 is a top plan View of the presser-foot. p

Fig. 3 represents a vertical sectional view taken 4g substantially on the line 3-3, Fig; l, disclosing the manner in which the forward foot-section is pivotally supported on the bifurcated end of" the ..Fig.4 is adisassembled perspective'view of the 593 presser-foot illustrating the details of construe?- tionrthereofi a E'igst- 5,6 and are views similar to Fig. 1-show-. ing, progressively, various positions of a cross-.

seam passing under the presser-foot.

5Q Accordingto the. preferred embodiment of the invention illustrated, the presser-foot comprises a shank l adapted to be secured as usual tothe conventional vertically movable presserr -bar" '2 I of a sewing machine having a reciprocating needleneed e a Kn s operate in the usual needle-apertures in' the; throat-plate l; which: latteris slotted as'usual to admit the conventional; serrated sections ofthe. four-motion feed-dog 5'.

The presser-foot shank I is formed at one endwith a depending rectangular portion 6 apertured-;.. 5, as at], to receive a transversetrunnion pin,.8 which is pivotally supported for limited verticali turning movement a yoke 9. The forwardend of; the yoke 9 is bifurcatedand, whenassembled'; is adapted to straddle the depending portion 9 of the shank l.

Pivoted to the freeends of the furcationsl 0 and.

ll of the yoke 9 is aforward or primary footsection I2. Rising from the primary foot-section:

!-2 are the spaced longitudinally disposed ears I3 3 forming'between them a channeladapted to re ceive the forward end of the yoke 9.

These ears l3, which prevent lateral displace ment of the primary foot-section with respect to' l the shank l, are suitably apertured, as at 14, 20: 9. 1 receive the headed pivot-studs l5 which are're-. tained in the apertures I6 in the yoke furcations l0 and I I by the screws l1 threaded into the ape ertures 18 provided, in the ears l3 of'the primary foot-section 12. As, clearly illustratedin Figs; 2. and 3, the primary foot-section is provided with; the usual needle-apertures l9 and-with the 1in'- clined channel 294 formed inrits-..under.surfaced Pivoted to the rearward portion of the yoked is the rearward, or secondary, foot-:section. 21. 31;. Rising from theseoondaryfootasection 2| are the: spacedlongitudinally disposed ears'22 provided. with apertures 23 which receive the transverse trunnion pin- 24 adapted to fit snugly in the apera: ture 25 provided in the rearward portion of yoke 9 It will be, noticedin. Fig. 4 that thelongil: tudinal axis of the trunnion pin24 is substantially parallel to a line passing. through the axis ofeach of the pivot-studs l5; and also that the trunnionpin 24 is positioned transversely. of'. the foot- 40?. sections. U

Preferablyformedon the-spaced ears -22 of the secondary foot-section M are two forwardly" exe tending projections-26 whichfit into suitably shaped notches orrecesses2l formedin the rear- 45215 ward ends of therears l3. of'the; primary foot section [2. The projectionslli armlzthe.cooperat ingnotches 2:1 provideahinge connection between the primary and. secondary footssections which; funptions to, forcibly raisethe toe-of the second 502: ary footgsection. when; a: cross-seam, it-ipas'sggx beyond the ,pivotalhpointuof the..primary root section, raises the heel. thereof. .It" Willi be ob served that, thenhinge. connectiomalso serves to retain the.,tr.e'ads,,.of bothfoot-sectiona substan 5" tially flushuatxpthein adjacent: edges. Obviously" any suitable, means. may beused in: place of the herein disclosed projectiomandnotch for opera tiyely connecting. thGQtWOrfflQtSBCfiOIlS together tAai ustratm inijiigicfisrthe; cross-seam sem..6

whose tread still rests upon the material.

come in contact with and is passing under the primary foot-section I2 and has caused a slight tilting of said foot-section without disturbing the normal position of the secondary foot-section 2| As the material is advanced by the feeding mechanism, (see Fig. 6), the cross-seam S passes beyond the pivotal point of the primary foot-section I 2, with the result that the latter is reversely tilted and, through its hinge connection with the secondary foot-section 2|, the toe of the latter is forcibly raised and does not obstruct the passage of the cross-seam S. In'Fig. '7 it will be seen that the tread of the primary foot-section l2 'rests upon the material after the cross-seam S passes beyond the pivotal point of the secondary foot-section 2l.' It will be obvious from Figs 5, 6 and 7 that the toe of the secondary foot-section does not interfere at any time with the passage beneath the presser-foot of the material or crossseams. Furthermore, the adjacent work-engaging edgesof the foot-sections'remain at all times substantially horizontally coplanar or, in other words, the adjacent heel or rear work-engaging edge of the primary foot-section l2 and toe or forward work-engaging edge of the secondary foot-section 2| are maintained at substantially the same levels regardless of the position of the cross-seam S beneath the presser-foot.

ofthe coil-spring bears against the yoke 9 and yieldingly maintains the furcations l0 and II thereof in contact with the shoulders 30 of the shank I. It is desirable when sewing material having exceptionally heavy cross-seams that the foot-sections have acomparatively large amount of pivotal movement; To accomplish this, the yoke of the present presser-foot is preferably slightlyarched, as clearly disclosed in Figs. 4 and 5. While I have shown and described in detail a preferred embodiment of the invention, lt'is to be understood that the invention is not limvited to a device having the details of construction and precise mode of operation described. To .zhandle seams of different character and Work of various thicknesses, the pressure applying sections of the 'foot may be varied in form and arrangement within the scope of the invention, as will be understood by those skilled in the art.

Having thus set forth the nature of the invention, what I claim herein is:- 7

l. A presser-footcomprising a shank, a plura ity of pivotally mounted foot-sections sustained by sa'idshank, and means constantly connecting said foot-sections together and rendered effective by the tilting of one foot-section for reversely tilting another of said foot-sections.

-2. A presser-foot for sewing machines comprising a plurality of foot-sections, a yoke to which said foot-sections are independently pivoted, a shank to which said yoke is pivoted, means interposed between said shank and yoke for yieldingly raising the forward end of the latter, and means for limiting movement of the yoke.

3. A presser-foot for sewing machines comprising a shank, a yoke attached to said shank, a foot-section pivoted to said yoke and having ears formed with3notches therein, and a second footsection pivoted to said yoke and'having ears *formed with projections thereon adapted to be received by the notches in said first-named footsection.

4. A sewing machine presser-foot having, in

combination, a shank formed with a depending portion, a bifurcated yoke attached to and stradshank formed with a depending portion, a bifurcated yoke attached to and straddling said depending portion, means interposed between the shank and' yoke for raising the forward end of the latter, a primary foot-section pivoted to the bifurcated end of said yoke, a secondary footsection pivoted to the rearward end of said yoke, and means connecting said foot-sections together and rendered effective by the tilting of one footsection for reversely tilting the other footsection.

6. A unitary presser member for, sewing machines having, in combination, a shank, a single yoke pivoted to said shank, a plurality of footsections independently pivoted to said yoke, and means at all times operatively connecting said foot-sections together.

'7. A sewing machine presser-foot comprising a shank, and a plurality of pivotally mounted foot-sections sustained by said shank, one of said foot-sections having a notch formed therein, and another of said foot-sections provided with a projection adapted to constantly engage the notch formed in said first-named foot-section.

8. A presser mechanism for sewing machines comprising a presser-bar, a shank carried by said presser-bar, a plurality of pivotally mounted footsections sustained by said shank, all of said footsections having a substantially equal pressure applied thereto during the operation of the machine, and means connected to one of said foot-sections for moving another of said foot-sections about its pivot.

9. A presser mechanism for sewing machines comprising a presser-bar, a presser-foot having a shank secured to said presser-bar, said presserfoot including a plurality of foot-sections mounted upon substantially parallel axes for limited pivotal movement, and means constructed and arranged to maintain at all times the adjacentwork-engaging edges of the foot-sections substantially horizontally coplanar.

10. A presser mechanism for sewing machines comprising a presser-bar, a presser-foot having a shank secured to said presser-bar, said presserfoot including a plurality of foot-sections mounted upon substantially parallel axes for limited pivotal movement, said parallel axes being arranged transversely of the foot-sections, and

means constructed and arranged to maintain at I RUDOLPH J. SAJLER.

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