US2366113A - Presser foot for sewing machines - Google Patents

Description

Dec. 26, 1944. Q A KESSLER 2,366,113

PRESSER-FOOT FOR SEWING MACHINES Filed Nov. 30, 1943 usual spring depressed presser-bar I8.

` Patented Dec. 1944 A Umref ranssnamoomtaon SEWINGMAcHmEsa Charles` A. Kessler, Amamani3N: Jr; assigmmu I The Singer` Manufactin-ingv Company; Elael ApplicationrNovember-30, 194=3a-S'erialrNt4 512,326:

@claims ere-feet .1 andfmore s particularly tocar presser-footy l whiclrzisrparticularlyfadapted forlffst havingheavycrosseseamssthereim Heretofore difcultyhasfbeen experiencedwhenc thef` conventional.; pressen-fcot;` v hai/ingr ai piyotali sole-portiomA has zbeeni usedFine.:combinatiorrwith, i

a -four emotion.- I feed'-` dog im; stitchingworinA havaarosef-duegtoffthefact1that the;gtoe+portion;;of..thee lotsvvith aa space: therebetween. through which. thee` V foot.:` wouldtnot;` readily risez andiridecoverythe. ,needleafll .descienda- Looaseclcin:` rear ofthetpivoti.

heavy crosseseams .andiasfaf result thetspeedgotL the; work? past` the needle `was reduced.: thereby;

inzzthefregionzro arcross seam@ causing :a: decreases imthe :length .ofeithesstitchesf..

. l 15..-aheelsof; thetsoleeplatectoficonstantlmurge lthe;l1eel.: It is: ,the object` of thisfinventiomtofprovider ai Dresserefoot thattzwifll tilt ,andrrideovertrtheucrosss l seam without retarding the, movement otthen,

material,'through` theimachine. y,

With the above and other objects in view, as will hereinafter appear, the invention comprises the devices, combinations and arrangements of parts hereinafter set forth and illustrated in the accompanying drawing of` a preferred embodiment of the invention, from which the several features of the invention and the advantages attained thereby will be readily understood by those'skilled in the artl In the drawing: i Fig. 1 is an end elevation of the stitch-forming and feeding mechanism of a sewing machine showing my improved presser-foot.

` paratory to sewing. l

Fig. 2 is a side view ofthe presser-foot, showl i realize-23er@ This :invention relates.E torsewingmaghina pigess? presserebarl Bibyrmeamsfofiarscrem l `Siisiafi press;

'er-foot comprising a Shanksrhaving.;anforwardai` i l 1yrextendingsportionzd 1Aeselle-,platex22 fhaving upstanding; earsss` 23u. whichzi aree locatedf.onpthets` 1pppositecsideiofztheufomardly .extending p ortiom: 2 I ,garesecuredctheretofby iaiipivottpim24h, `Thee soleeplatern f, iseformed: with .an upvvarcllin curvedc heelfportionrz Stande zbirurcatedetoeeporticn .Aproei` viding itwoefonwandlyaextendingfiportionsi 21;` .28e

pirriZIlmwi-thi oneiendtdisposedna recesstimthe DorticnzxZI .om the :shanksisra compression spring 25h whlclmreactssbetweenttheeportiomz It and. ther;

Zmownwardly andawaas viewed inzFig. hither-,solch theawscleenlate tcabeffinclined@upwardlyyandi at an angle tothe throat-plate 30 when the presser` bar is raised, thereby facilitating the insertion of a new piece of material under the sole-plate pre- It has been found that when a `conventional presser-foot of the above described type is used institching work having heavyor thick crossseams the` toe-portion of the sole-plate would not readily riseand ride over the seam. To overcome this difliculty the length of thetoe-portion of the sole-plate was increased and the length of the heel portion decreased to provide a more advantageous lever action when the seam engages the toe-portion. When the necessary advantage in leverage is thus obtained thetoe-porticn, due to the reduced heel length, will rise so high that the cross-seamwill jam against the sharply inclined sole-plate thereby reducing the feeding ef- 1 fect of the feed-dog and resulting in stopping of rotary hook I2 and the usual feed rock-shafts I3 and I4 which imparta four motion movement to `a feed-dog I5, in the usual and well known manner.

J ournaled for reciprocatory movement in the head II is a needle-bar` IB carrying an eye pointed needle I1. Also journaled fora right line up and down movement in the head I I is the For a complete and detailed description of the sewing machine mechanism reference may be hadto the patent to Kaier No. 2,206,285, dated July 2, 1940.

Removably secured to the lower end of the t `thefeeding of the work or reducing the length of the stitches.

` To apply pressure on the toe ot the sole-plate and to limit the tilting movement of the sole- I plate to prevent it from rising too high and thus reducing the feeding effect of the feed-dog, I have provided a flat U-shaped spring 3I which is spaced above the sole-plate 22 as shown in Fig. 1. -The spring is formed with a laterally eX tending L-shaped portion 32, which togetherwith the upper end of the spring forms a troughshaped portion which is adapted to embrace the upperend of the shank 20. The L-shapedp,or`

l tion 32 is formed with a slot 33 which is adapted @for varying the height of the to receive the screw I9, thereby providing means spring 3I abovethe sole-plate 22. i

As shown -in the drawing the free end of the spring 3| extends outwardly to a pointl adjacent the end of the toe-portion 28 so that when the cross-seam C (Fig. 2) is encountered the toe of the sole-plate will rise until its end strikes the end `of the spring 3|. The angle at which the sole-plate may be tilted is limited by the spring and, therefore, cannot be tilted atJ an angle great enough to form an obstruction to the passage of the seam. After the sole-plate has reached the Vposition shown in Fig. 2 the feed-dog l5 advances l the material and the presser-foot rises and rides pivotally secured to the lower end thereof, said' sole-plate being formed with a forwardly extending toe-portion, and a at U- shaped spring having one end secured to said shank and spaced above said sole-plate, said spring extending outwardly over the sole-plate and having its free end overlying and spaced above saidtoe-portion. 2. A sewing machine presser-foot comprising a shank adapted for attachment to the presserbar of asewing machine, said shank having a depending portion to which a sole-plate is pivotally secured, a at spring having one end adljustably secured to said presser-foot and its freeV end overlying and spaced above said sole-plate.

3. A sewing machine attachment for use with a sewing machine equipped with a presser-foot having a sole-plate adapted for movement about a horizontally arrangedpivot comprising a spring overlying and spaced above said sole-plate, one end of said spring being adjustably secured to said presser-foot for vertical adjustment whereby the distance between the free end of said spring and the sole-plate may be varied.

4. In combination, a sewing machine presserfoot having a shank adapted to be secured to the presser-bar of a sewing machine by a screw, a sole-plate pivotally secured to said shank for tilting movement about a horizontal axis, said soleplate having a heel and toe-portion, and a flat spring having one of its ends embracing said shank and clamped thereto by said screw, and its free end spaced above and overlying the toeportion of said sole-plate. t

5. A sewing machine having in combination); feeding mechanism including a four motion feeddog, a presser-foot having a hinged sole-plate cooperating with said feed-dog to advance the work and having a' heel and toe-portion and a U- shaped spring having one of its ends overlying said sole-plate and spaced above the toe-portion thereof in a position tobe engaged by 'said toeportion when a cross-seam is encountered.

6. An attachment for a sewing machine presser-foot having a pivoted sole-plate formed with a toe-portion comprising a flatI U-shaped spring having at one end thereof a trough shaped shank adapted tol embrace the shank of a sewing machine presser-foot, said trough shaped shank of the spring being formed with a slot in one of its walls and the other end of the spring being spaced from and adapted to overlie the toe-portion of the sole-plate in the normal position of the.

Images