US1765332A - Presser foot for sewing machines - Google Patents

Description

June 17, 1930. w, HANNEMAN 1,765,332

PRESSER FOOT FOR SEWING MACHINES Filed Oct. 10, 1927 Patented June 17, 1930 1 [UNITED STATES WALTER M. HANNEIMAN, or OAK PARK,

ILLINOIS, ASSIGNOR To- UNION SPECIAL MACHINE/COMPANY; OF CHICAGO, ILLINOIS; A CORPORATION OFILLINOI S PRESSER room non SEWING MACHINES I Application 1114a October 10, 1927. Serial No. 225,260.

I The invention relates to new and usefulimprovements a presser foot for sewing machines, and more particularly to a presser foot for forming a fell seam. I

5;} iAnobject of theinvention isjto provide a presser foot-havinga channel extending lengthwise thereof for guidingthe fabric sections for. felling, with bodilyyielding devices for engaging the enohained, needle thread loops directly in rear of the'needl'es 1 for holding the thread loops duringjchaim theimproved presser foot includes a supporting shank 1 which is adapted-to be attached to ing v I.

In' the drawings which show by way of illustrationone embodiment ofthe inve'ntion I Figure l is a longitudinal sectional view through a,presser foot, the throat plate and feed dog associatedtherewith; and showing a portionof'the needlesand of the loopers; I F ig; 2 is a view partly in section and partly I in plan of the presser foot;

Fig. 3 is albottom plan view;

Fig. 4 is a sectional-view, on the line Fig. 5 is a view showing more or less -.dia-.

' grammatically andin section, theposition of the chaining device when thefabric section is entering beneath the foot, and

Fig. 6 is a View similar to Fig. 5',

derneath'the foot. i

presser 'footfor forming a felling seam, and a foot portion provided with a channel on its under face-which guides and holds'in proper position relative tofeach other, the I interfolded portions of the fabric which are being stitched to form the seam. This channel preferably gradually decreases in depth from the front of the 'foot (toward therear. Located directly in rear; of theneedle openwhich yield bodily, and t these devices are capableof movement to a positionslightly' clamping the same against the throat plate so as to 'insure'proper stitch formation. 5 These 1 yielding devices passbeneath the'surfaceof I I I I I st tching areformed. The-material 1s. supthe presserfoot for clamping and holdingthe en h in d thr ad ops a he t m w e h fabric section is ente ng beneath the f et;

, but showingthe fabricsection as passing from un- 1 portion 41s provided with a guiding channel The invention is "directed broadly to a" 6 which extends from the forwardend of the ings through the Ifoot'fportion are devices and at a time when the fabric section is pass- 7 ing from beneath the foot. They are also located in thechanneland extend beneath the upper wall thereof so as to clamp the enchained thread loops when no fabric is passingthrough and the machine is chaining ofi.

'Thesedevic'es yield when the seam is being formed and passing through the guiding channel at which itime they rest upon the upper face of the fabric sections. a

Referring more in detail to the drawing,

a presser bar 2. The shank 1 has a forwardly projecting portion 3 to which the foot por-v I indicated in dotted lines in Fig. l. The upf per face of the foot portiondirectly beneath .the'shahk portion 3 engages said shank portion and limits the upward movement of the heel of the foot portion. The front end or toe of the foot portion may, however, rise when a fabric section is inserted beneath the foot. This tilting of the foot portion is of the usual operation in a felling presser foot. The foot foot to the rear end of the foot. This guiding channelis of a width corresponding to the I width of'the fell seam, that is, the fabric sec tions are inter-folded and guidedintoflthe channel, and the edge of the fold in one secdirectly'beneath the other side wall o'ffthe channel. This channel decreasesin' depth from the front end of the foot to the rear of' the foot, as is-usual in a fellingfoo't. I

The interfolded fabric sections are secured by a stitching mechanismfwhich consists preferably of tw'o needles 7 and 8. i A looper 9 cooperates with the needle 7 ,1 and a looper 3 i 10 cooperateswith the needle 8, and thus it;

is that two independent parallel lines? of portedon a work- 'support'which I is I provided with a throatiplatel'l. This} throat plate which is the usua ons ructi n:

The invention is directed particularly to 7 the devices which cooperate in holding the enchained thread loops when the machine is chaining and in stitching fabric sections.

; There is a yielding clamping device 14'asso-' ciated with each needle. The shank portion 3 is provided with openings in which these clamping devices are located. The clamping devices are similar in constructionand a de scription ofone'will answer vfor the other. The clamping device 14 consists of an elongated member placed in vertical position and extending through the recess therefor inthe shank portion 8, and also through the open- .vice 14L is rigidly attached at its upper end to a spring arm 16 by means of a'cl'amping screw 17. The twospring arms 16, lfifor ,the clamping devices are preferably formed integral with a supporting shank'member 18 Swhich is clamped by means of a screw 19 to the shank 1 of the'presser foot. These spring arms normally force the clamp'ingdevices in a downward direction, and their ektentof downward movement is limited by the spring arm coming in contact with the upper face of the shank portion 8 Each clamping device'is rounded off at the lower front side thereof as. indicated at Each of the 40 clamping devices 14 relatively short the direction of feed being even of less length than the solid section of the throat plate' pp r ng shan fQ t pe tien pivoted t 12. lVhen the material being stitched passes the needle this yielding section will almost immediately engage the-enchained thread loops, while theremainder of the presser. foot is held raised from. the throatplate by the material being stitched passing beneath the same; This enables the threads to-Ybe controlled during the pchaining between stitched articles from the time when one ar: ticle passesthe needle until the next article is fed thereto. Y

. The operation of the device is thought to w i be obvious from the, abovedescript'ion. Let us assume that the machine isstitching and fabric sections are inserted in the machine. The interfolded portions of the fabric secfabric sections enter beneath the foot they will tilt the foot, as indicated in'Fi 5. The

- Q clamping devices at thistime will hemoved down through the opening in the zpresser feet a e e-in t th ne s e h ee i ee indi ated t 2 cleari h sam f rma i n anl'be c omp he e: J fabric section passes the clamping devicesas ing in the foot portion 4. This clamping de' e d as to enseg l e we" 0 1$; Contre 0 h me, W11 tions are directed into the channel 6. As the lamping d vic s-Will passnp nter-the fabr c t on a d' he yield g-devices will th be raised so that their under faces are flush with the upper wall of the channel. The fabric section has reached a point where the thread loops passthroughthe fabric, andtherefo're. i is 110 q ge c ssary tocle pthethr loops by -the'clampingfdevices. The of the thread l QP th iciugh the ab hold the'threadloopsso that proper stitchtmoves ut from. u ernea h the liesse fe t th mp dei c will figill m d s as b lamzptm sn hjeilr thread loops against the solid portion12 with whichit is associated, and thisinsuresproper formation of enchained threadyloop's. the mpr dd e d s ib d, t wil be ppar h t f ric sec ns may b pessedi suc e s h b neath h P e s ro t arm g 9s felling seams thereiny and a perfeet series of n hrea 1991 formed .ext ndiii f om e fabr cc i'cnto a o her Ib b ieusill f nincr changes inthe tails of construction. the arrang m t f the Parts may e made .withe 'it "dep rt .fromihe spirit of the invention lasfsetf orth' i t anpehded'cla ms Having thus deserlbed-the invention, what I e mes i and de r to secu e by L M ters Patent, is' e I V A p ses f nt f r el ing comprisin a said shank, said foot portion a needle pe lns' h t rong t a d a chann lin its nd r faceez-tend ng long tu nal y thereof,

0f h t r i e fo clamping th eln- 1 chained thread'leops during chaining between ar cl bei g stitched; sai lamn l be ng relative y! Short n t e c loops and maintainfa substa a cle, is passes-mm th ch A presi r eot er lel supporting shanln' sa 'sllan ssaid 10. p...v .c p ning. herethrbueh, a h 'uildereface extending leng i i so s t receive and. guide I portions of the fell-seam, a vertically disposed clamping member located directly and wholly in rear of the needle opening, and a yielding arm attached to said member for supporting the same and normally forcing said member so that the lower end thereof projects beneath the foot portion of the presser foot whereby said clamping member is adapted to cooperate with the solid portion of the throat plate'for clamping enchained thread loops during stitching, said clamping member being relatively short in the direction of feed so as to engage theenchaining thread loops'and maintain a substantially continuous control of the same when the stitched article is passing from the machine. 3. A presser foot for felling comprising a supporting shank, a foot portion pivoted to said shank, said foot portion having a needle opening therethrough and'a channel in its under face extending longitudinally thereof so as to receive and guide the interfolded portions of the fell seam, a vertically disposed clamping member located directly and wholly in rear of the needle opening, and a yielding arm attachcdto said member for supporting the same and normally forcing said member so that the lower end thereof projects beneath the foot portion of the presser foot whereby said clamping member is adapted to cooperate with the solid por tion of the throat plate for clamping enchained thread loops during stitching, the forward end of said clamping member being rounded off 'soas to cause said clamping member to beraised by the fabric section as it passes beneath the presser foot, said clamping member being relatively short in the a 410 direction of feed so as to engage the enchaining thread loops and maintain a substantially continuous control ofthe same when the stitched article is passing from the machine. In testimony whereof; I aflix my signature.

.WALTER M. HANNEMAN.

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