US2012157A - Pressure adjusting means - Google Patents

Description

' Aug. 20, 1935.

A. L. CORSON PRESSURE ADJUSTING MEANS Filed May 14, 1934 2 Sheets-Sheet 1 l/wvenor @r1/1m Z. fom'on /l/ I worn@ ug- 20, 1935. A. L.. c'oRsoN 2,012,157

PRESSURE ADJUSTING MEANS Filed May 14, 1934 2 Sheets-Sheet 2 13a( J. 1l/,3,6 2T 7 JW ff@ a f' i Y j W j f A n Ee- 7 1 14a Z730 J 5z v H j; 5f

E l| ll zz l l JJ 13 M) l 'l I 9 n Jg@ l] G Il l 5b x l 8 l| g L? /I/ l Il?? Patented Aug. 20, 1935 i 2,012,157 rarissima ADJUSTING MEANsf ArthurL.v`Cor`sn MaldenyMassjassignor to Harry DexterPeck, Providence, R. I. f '1 Application ivm?V 14,1934, serial No.v725,614 l 5 Claims.- (cil'lief-zeit)VA This invention relates to:r pressure adjusting means. More especiallylit relates tomeansfor quickly adjusting the Lpressure exerted'-by the presser foot of` a ysewingmachine fronrthat ref quired for ordinary sewing to thatdesirablevfor darning or embroideringand Vvice versa.: l l

Inusing an'ordinary sewing machine fordarn# ing, it is customary to liftk the. presser foot from the materialso'tha't thelatter can-be movedfree'- j ly to shift it back and forth during the 'formation ofthe darning stitches.` Thisis notsatisfactory,V

however, because there is fliabilityo'f skipping stitches lfor the -reasonthat the material will lift with the needle and thus the latter will fail-.to throw out loops of itsthread to be entered by the shuttle or other loop-taking device. Because of the removal of the vertical restriction to vthelift- Y ing vof the material the thread iseasily' broken and since there is -no mechanical aid in the positioning orguiding of the material, good darning is notordinarily accomplished. f

To be sure, he usual adjusting Vscrew for varying'the spring pressure exerted onv thejprefsser footY bar mightbe backed-oir or turned down-t vary the pressure "exerted by thefoot, but this is a slow method of adjustment and one Abywh'ich any desired result vmust be 'approachedj by trial. Once the operator has adjusted this screwtofgive the proper pressure Afor sewing she is reluctant' to change it for darning, not only because of ithe ytroublev of Vproperly Vadjusting the pressure.' for darning but also becausegof Athe dimcultyfof again resetting the screw to restore thev proper pressure forsewing.` f'

It isan objectof the 'presentI 'invention to 'pro fvfidesimple means wherebyjthe pressure exerted by the Ypresser foot can be easily andiquickly shifted from that suitable for sewing to that desirablefordarning, and vice versa.` 'Y Itis a feature of thefimproved means that no'alteration in the normal position ofthe presser foot itself 'is made, the foot remaining in proper position to stripfth'e and guiding of the work.

The accompanying drawings show vthe "best mode in whichI have contemplated applying the principles of my invention but these 'are'to 'be material from the needle-and aid in the holding taken as merely illustrative for it is intendedthat the patentshall cover by suitablevexpressionin the appended claims -whateverffeatures ofy pat- 'r entable novelty exist in the invention asqa whole:

Inthe drawings:VK a Y Figure 1* is a sidelelevation of thev head o ffa sewing machine having my improved meanslap-A `ligurer2--is anelevationv in section plied thereto; the pressure of the foot being ad#` justedlfor ordinaryI sewing; f .i as on line 2'2 of F1'gure1;4 w

Figures is v`anew like rigurerbutwith the f5 pressureadjusted iordarning;`v

Figure I is 1 a side elevation, partly in section,

showing 'a' modified form ofthe pressure adjusting'means; f

Figure 5 is an elevation in'section online 5-5 lof fofFigure 4;1

Figure 6 is an elevation, partlyin section,4 showing still anotherform inv which theprinciples of my invention maybe embodied. l

Figure 7 isv an; elevation, mostly in section, l5'

showing stillanother modification andY v Figure 8 is an' elevation taken as on lineSTS of Figure 7. f f

' Referring now to the drawings and especially to Figures 1-, 2 andrfthe headei of va sewing machine has theV usual'needlejZ and needlebar 3 and a presser foot 4. A'I he latter is mounted on the lower end of a` presser bar 5 `which accordance with my invention is hollow at tsfllpllveiiportion'and y is preferably provided with aanged head 6.' This 25 Vbar passesthrough the 'customary pressure ade justing thumb: screw 1, which screws into a tapped hole'invthe head, and the bar carries the usualk block 8 from which extends an arm 9 tobe engaged'by'a hand-lever 10 for raising orlower- 30' ing thepresser footwith respect to the material.V Around the vbar is a coiled spring l I,v the upper end offwhich rests against the inneren'djof the d the lower end of which thumb-screw4 `v`'i 'j an ordinarily exerts pressure directlyon the presser foot bar. l my a rrangement, howe'ever, v the bottom end of thisspringrests .on a pin i2 which projects through diametrically opposed' slots i3 provided in vthe bar near the lower` end of its 4'0 yhollow portion. This pin is secured to aiplunger vIll whichisslidable in the hollow of the presser foot bar.. The yplunger'extends-"a suitable dis-5 tance above the, head vof thebar and at its upper.

end carries a rcam lever |5 The latter is pivotal- 45 1y mounted on the plunger and as shown clearly in Figure 2 can be easily and quickly turned fromA the positionshown` in full lines to that shown vin 'dotted-outline. v

* When in. the, position inFigure Landin 5 V fulllines in Figure 2,1the'cam lever holds the pmngerjm itsupper position with respect to the presser. bar. This effects 'compression of the spring 'and 'also' what'will be. called the heavy pressure .ofthe presser.v foot. .,Thatv is, the spring 5 5 from the plunger by the cam f2 being relatively tightly compressed exerts a heavy force against the pin I2 which is of course applied to the plunger ill. But this force is transmitted l lever I5 to the presser 4foot lbar. 5 and thence by the presser foot i to the material. This is the pressure used for ordinary sewing and it may be particularly adjusted or determined by a proper setting of the thumb-screw 7. I

Instead of laboriously turning this thumbscrew to :obtain a presser foot pressure suitable for darning, the invention avoids any such turning whatever and enables the operator to obtain the desired darning pressure the cam lever I5 from its full line position of Figure 2 to the position shown in dotted outline in this same ligure and in full lines in YFigure 3`.

'I'hisshifting of the hand lever permits the plunger Il and pin I2 to descend with respectto the presser bar 5 and thus enables the spring to expand and thereby exert less force on the pin. As previously described this force is finally applied by the presser foot thus giving what pmay `be termed the light pressure of the presser foot.

Note lthat in changing from-heavy to .light pressure, and vice versa, the position of thepresser foot itself is not altered. It remains properly positioned to strip the material from the needle and gives the proper pressure on the work for either sewing or darning. l ,Y

In the modification shown in Figures 4 andv5 the presser foot bar 5a is hollow throughout-substantially its entire length. The plunger Ila is longer and is engaged at its( lower end by a cam i6 carried by a shaft I1 which is pivotally mounted on the presser bar. A hand lever I8, alsol carrled on the shaft Il, enables the cam to be swung between the position shown in full lines in Figure 5 to the position indicated 'in dotted outline. In one position theplunger is held upward with respect to the presser bar and thespring II is accordingly compressed thereb'yeffecting the heavyV pressure of the presser foot.` In the other position, the plunger is in its lower position with respect to the presser bar and the light pressure of the presser foot is attained.

Figure 6 shows a solid presser bar 5b having a reduced upper portion 5b slidable in and with respect tov an extended sleeve. I9. This in `tu'rnis slidable and rotatable Within the thumb-screw 1. The bar carries a pin 12d against which thelower end or the spring `II rests, its upper end resting against a suitable dished plate 2) on the lower end of the sleeve I9.` The latter has a suitable slot 2l in its wall, in which extends another pin 22 secured to the thumb-screw l. To vary 'the pressure in this embodiment of the invention, the knurled head IS of the sleeve is grasped and ro-V tated. The cam action between pin" '22 and the slot 2l causes the sleeve to descendwith respect to the presser bar to the position indicatedin dottedoutline thereby compressing the spring I I.

This effectsthe heavy pressure of the presser foot,

whereas with the sleeve in its upper position, as shown in full lines in Figure 6, the spring 'iseX- tended and the light pressure of the presser foot eiected. Y i

In the modification shown inv-Figures 7 Vand, the presser bar 5b is like that of Figure 5 and has the pin Ia against which the lower end of spring II rests. The upper end of lthis spring rests against the flanged end ISa' of a sleeve I'Sa' that extends beyond ,they thumb-screw 1 to terminate in a knob Iga. The anged end ISahas a pinlike projection 23 extending into a cam groove by .simply flipping the portion 2lb of. the groove.

24 oi a cam 25 pivotally mounted on the face plate 26. This mounting is by means of a suitable shouldered screw 21 which can be locked to the face plate by the thumb-nut 28 and is adjustable vertically of the head in the slot T129.y

As shown in the drawings the projection 23 is resting in a suitable depression 24a in the groove 24 and when thus positioned the spring II is in compression and the heavy pressure is exerted by the presser foot. To adjust for light pressure, the operator presses down slightly on knob I9a thereby lowering the sleeve isa. and projection 23 so that the latter is clear of the depression 26a.;V A coiled spring 3Q, coiled about the pivot screw 21, is anchored at one end by the pinS'I on the plate and its other end presses against a trip 32 att-33. The trip,.asseen in Figure 8 is resting pivotally mounted on the cam against a pin 3d being urged thereagainst by the spring 3G. As the projection 23 leaves the depressionaythe -cam andthe trip are swung together by the spring 30 toward the left. This permits the projection ytp pass upward through When it reaches thetrip 32 the latter rotates aboutits ownvpivot `to permit the projection Z3 to pass upward rto the apex 24e of the groove, the triprswnging back against the pin 34. The spring II is now extended `and the presser foot exerting the light pressure suitable for darning.

Y l To restorer the heavy or sewingpressure the operator mer y pushes the'sleeve I9a downward. The projection 23 is now guided by the trip 32 into theportion 24d o f thegroove and as it reaches the lower end thereof the cam is again urgedtotheleft. A slight release on the lnob ISaTperrnitsthe projection to again enter the ,depression `21min the groove whereupon the sleeve will Ybe held in its `illustrated position and the spring compressed for ordinary sewing.

Thev several modifications disclosed indicate the various means that may be employed to practiceY thedprinciples of my invention but these modications are notrto be taken in a limiting A'sense but as purely representative lof means whereby the pressure of the presser foot may be quickly and veasily adjusted without variation in the operative position of the foot itself.

1. Pressure adjusting means for the presser foot of a sewing machine comprising, in combination; a, hollow presser bar carrying Va presser foot;'A a plunger movable 4within the vhollow oi said bar;` a, spring arranged to impose its orce onsaid plunger; Aand means for transmitting said force vfrom said plunger'to the presser bar including 'means Iior changing the relation of said plunger with respect to said bar to effect a different spring force and thereby eiecta dii- 'erentpressure exerted by the presser foot.

whereby the relative positions of said bar and member can be altered to vary the effect of the spring force on the bar. Y y v i 3. Pressure adjusting means tor the presser foot of asewing machine comprising, in combination; a hollow presser bar having slots in its adapted-to be moved to vary the relation of ysaid bar and member and thereby the :force of said spring whereby dilerent pressures maybe exerted by said bar and presser foot.

foot of a sewing machine comprising, in combination, a presser bar carrying ay presser foot; a spring coiled about said bar with one end restingagainsta, normally xed abutment; a meme ber against which the othery end ofthe spring rests; and an adjustable connection between said member and the bar for transmitting the forcel of said spring to the bar and presser f oot.

vthe foot itself.

5. Pressure adjusting means'for the presser u foot of a sewing machine comprising, in combination, a presserA lmember carrying a presser foot; a cylindrical plunger member Yarranged telescopically with respect to theL presser'member with their axes coincident; one of said members being hollow and the other. of said members being movable within the said hollow; a spring coiled about the axes of both said members with one end resting against the plunger member and 4. Pressure adjusting means: for the presser 's arranged Vto effect the pressure exerted by the presser foot; and means for holding' the plunger member at diierent positions'with respect to the presser member to vary the force of saidspring Y Vand thereby changethe pressure exerted by the presser foot withoutchanging the position of ARTHUR L. consort,

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