US1731094A - Presser foot for sewing machines - Google Patents

Description

Get. 8, 1929. N. v. cHRlsTENsEN 1,731,094

PRESSER FOOT FOR `SEWING CINES Filed June 28. 1927 2 Sheets-Sheet l Oct. 8, 1929.

N. V. CHRISTENSEN PRESSER FOOT FOR` SEWING MACHINES Filed June 28. 1927 2 Sheets-Sheet 2 Patented Oct, 8, 1929 UNITED srnrss PATENT OFFICE NORMAN v CHRISTENSEN, or onions-o, I'Lriinoi's, Assenoe ltro Union sinon'n MACHINE coMPANY, or CHICAGO, immers, A' celeron-Amon criminels' PRESSER roer non snwrne ivi'nonrims Application filed June 28, 1927. Serial No.' 202,030.

F 2, und showin g the rneedle :indieed willi the parts positioned during chaining oi'';

Fig. 5 is ii-riew siinilur to Fig. 3,' but showing the position ot' the parts duringfelling;

Fig. 4 isn sectional viewy ontlieline 4, 4er' Fig. l.

ln the iipp'licution of Joseph Berger, `Serial No. 121,425, i'iled July 9, y1926, there isshown :ind described n presser loot for 'telling-hav ing cliziiiiing'lingers for engaging the enchiiined threaid loops in rear of needles, und also having s channel for guiding the interifolded portionsof the iin-bric sectionsv which are being stitched together.- The present invention is directed to iin`iinprovenient upon the presser foot of' seid applica'- tion. The presser foot includes usliinil;A por` tion l which is mounted on' n presser lbarf ofthe usual type. Said shank portion l ex-r tends 'the 'full `width of the l'oot portieri und is provided' withv recesses 4, l adjacent the'y sides thereof. The' i'oot portion' is provided with upstzinding inenibers 5, 5 which lit ywith-- in these recesses 4,4, and u pivot rod 6' passingtliroi'ighfthe shiink and t7 The invention relates to new :ind useful iinprovenients in i presser foot for sewing machines, und n'iore particularly to i presser foot for felling.

An object or the invention is to provide u presser foot having n channel extending lengthwise thereof".l for guiding the iibric sections for felling, with 'ineens whereby suid presser foot exerts n unitorin pressure on the interfolded portions the il'iric in 'the region directly in rear of theneedles and eX- tending throughout the entire length of the feed dog section in reni' of' the needles, and whereby seid presser looteilerts s yielding cluniping action upon the encliiiined thread loops directly in reiir oi the needles during chaining oil'.

Afurther object oli' the invention to provide zi presseriioot of the above ty 3e wherein yielding lingers are provided in the channel 'for guiding the inter-folded fabric sections Lfor clamping the enchiiined thread loops during chaining oil", and wherein adjustable stops cre provided for lii'iiiting the ineveinent of .seid zidj'ustiible lingers in on upward direction during felling, so iis to exert zi iiiiiiforni pressure on siiid .inter'ifolded portions et the izibric throughout the entire length of the the shank lingers. Y 8.' These cuts further object oi" 4lie invention is lo propose of providing proper clean-anice for they vide zi pi' 1' 'foot of the shove type wherein swinging ot' the foot. The shzinl: of the the foot portion is pivo'ed to u supporting presser foot is recessed ut S) und i rod l() cnrshank so that the ,toot portion ii'niy'iii to ried by the 'loot portion extends across the receive the iibric sections und also tilt when SMH und is lOCiied in this recess. rl'he rod thev l'iibric sections of u stitched article :ire l0 COHldCS With lll@ Willis Of the recess and passing ironi benentli the yfoot, und wherein .llml th? swlnglll' mowmcm 0f H19 1365591' positive nien-ns is provided for liii'iitinp 'the o'tonfih? Shlllll l K tilting nioveinent of rthe 'foot in both diri-:cf le Oft Portmn 15 Provlded 71th ,a Chim suli..heisserses isses? .MRSC Qdpulel ObJeCSll/'m bb, Op to receive the interfolded porlioilis of the viens arno will in port ue hereinziner nioie fabric Sectiong which are to be united in the muy disclged. l. fell seam. This channel 11 extends all the l yln the drawings which showY by wiiy oil' Way to the rem. of the foot Located in the illustration one einbodniient oir tiic presser Chnnel are fingers 127 13 and M Three OO- ngers are shown in the drawings, because the Figur@ l S 2 Sill@ VGW 0f th@ SFl'l; foot is designed to be used with three needles.y

Fig.v 2 is e. view showing the pre "ir bur If the foot was intended for a single needle in section, und the presser foot iii plan; machine, then of course, only one linger Fig. is :i sectionilfviewon the line 3, 3 ofv would be used. Any number of needles niiiy tions or the icoon, pivotiilly-secures the 'toot to the slienlr. he eiftreine side portions of are bevelec or cut iiwfiy zit 7 und 'ey portions are lorthe purbe used, and the foot will be constructed with a yielding finger for each needle. The presser foot is provided with a needle opening l5 for each needle, and the yielding linger terminates at the rear side of this opening, and is preferably curved to form the rear side of the needle opening. Thus it is that each finger terminates directly in rear of the needle with which it is associated. .Vhen the foot is adapted for a three needle machine, the needle openings are arranged in a line at an acute angle to the longitudinal axis of the foot. This is for the purpose of permitting an independent looper moving in a direction at right angles to the longitudinal a-Xis of the foot to cooperate with each needle.

In Figures 3 and 3a, one of the three needles is shown, and is indicated at 16. Cooperating with this needle is a looper 17. The material being stitched passes over a throat plate 18 and is fed beneath the presser foot by the feed dog 19. The throat plate 18 is provided with a solid portion 2O directly in rear of the opening in the throat plate for each needle. f

Coming back again to the three yielding lingers are all pivonalljv mounted on the supporting bar 2l. This pivotal supporting bar 2l is some distance in rear of the pivotal support 6 for the footportion of the presser foot. There is a spring 22 for each yielding finger. This spring bears against an adjustable screw 23 threaded into the upper end of the rear portion of the finger. These yielding fingers, as to their mounting, and the springs for actuating the same, form no part per se of the present invention, but are shown, described and claimed in the application filed by Walter M. Hanneman and Russell H. Hideout, November Qd, 1926, Serial No. 150,460.

The upstanding members e, 5 are connected by the cross bar 2%. Threaded into this cross bar are three adjustable stop screws 25, 25, There is a stop screw for each finger. These stop screws limit the upward movement of the forward end of the lingers.

The operation of the improved presser foot is as follows. In Fig. 3a, the material is shown as passing beneath the foot, the parts being interfolded to form a fell. The interfolded parts of the fabric sections are received and guided by the channel 1l at the forward end of the foot portion. The fingers l2, 13 and le rest on the upper face of the interfolded portions of the fabric sections.

i e main spring acting on the presser bar 2 will force the foot section downwardly. The front portions ofthe fingers will be pressed upwardly by the fabric until the stop screws are engaged. The rear portions of the lingers pivot on the bar 2l and have no movement relative to the Vfoot section at their pivotal centers, and therefore, these fingers, in effect,

the yielding fingers,

become the solid portion of the foot section' during the stitching of the fabric sections and the forming of the fell seam. The foot portion will tilt on the pivot bar 6 to permit the fabric sections to enter. The fingers will also tilt on the foot section as the stop screws are carried thereby. This is during the entering of the fabric beneath the foot, as the fabric will engage the fingers, pass underneath the curved forward ends thereof, and swing the fingers until they engage the stops. The fingers, however, will not be brought into engagement with. the stops, until the fabric passes underneath the fingers. Therefore, the springs Q2 will swing the forward ends of the lingers downward and cause the enchained thread loops between articles to be properly clamped chaining off, and the feeding of the enchained thread loops. lWhen the fabric sections are all the way beneath the foot, the yielding fingers will engage the upper face of the interfolded fabric sections with a uniform pressure throughout the entire length of the linger. The sections of the feed dog 'i9 directly beneath the fingers, will, therefore, have a cooperative action with the finger tnroughout the entire length of the section of the feed dog. During felling, when the fabric is entirely beneath the foot, the presser foot operates, in effect, as a solid foot. TWhen the fabric is starting beneath the foot, however, then the finger will yield and cooperate with the throat plate and feed in the chaining ofi', after the manner fully set forth in the Berger application. Liliewise, when the article is leaving the foot, the fingers will again cooperate 'with the throat plate and the feed dog in the insuring of the proper formacion of the stitches and the chaining off between articles.

As has been noted above, the stops Q5 are adjustable, and this is particularly for the purpose of adjusting the chaining lingers for operating on fabrics of different thicknesses. By adjusting these stops, the upward movement of the chaining fingers can be varied so as to bring about a substantially solid foot condition for the thiol-:ness of fabric being stitched.

It is obvious that minor changes in the details of construction can be made without departing from the spirit of the invention as set forth in the appended claims.

Having thus described the invention, what T claim as new and desire to secure by Letters- Patent, is

l. A felling presser foot for sewing machines 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 at the forward end thereof disposed so as to receive and guide the interfolded portions of the fell seam, said foot portion having means for engaging the interfolded portions of the fabric sections with a uniform pressure in rear of the needles and froin a pointI adjacentthe needles to the rear of the foot during felling when the fabric sections are fully beneath the foot portion, and for yieldingly clamping and feeding the enchained thread loops between stitched articles and while the articles are entering beneath the foot and passing from beneath the foot.

2. A felling presser foot for sewing inachines con'iprising a supporting shank,a foot portion pivoted to said shank, said foot portion having a needle opening therethrough and a channelin its under face at the forward end thereof disposed so as to receive and guide the interfolded portions of the fell sean'i, said foot portion having' ineans for engaging the interfolded portions of the fabric sections with a uniforin pressure in rear of the needles and frein a point jacent the needles to the rear of the foot during` felling` when the fabric sections are fully beneath the 'foot portion, and for yieldingly clamping and feeding the enchained thread loops be tween stitched articles and while the articles are entering beneath the foot and passing from beneath the foot, and ineans for limiting the swinging inoveinents of the foot portion on said shank when the fabric section is entering beneath the foot and when the fabric sectionvis passing froin beneath the foot.

8. A felling presser foot for sewing inachines comprising a supporting shank, a foot portion pivoted to said shank, said foot por-- tion having a needle opening therethrough and a channel in its under face at the forward end thereof disposed so as to receive and guide the interfolded portions of the fell seain, said foot portion having means for ent `ring the interfolded portions of the fabric sections with a uniform pressure in rear of the needles and from a point adjacent the needles to the rear of the foot during felling when the fabric sections are fully benea h the foot portion, and for yieldingly clamping and feeding the enehained thread loops be tween rstitched articles and while the artic-.les are entering beneath the foot and passing from beneath the foot, means for limiting the swinging movements of the foot portion on said shank when the fabric'section is entering beneath the foot and when the fabric section is passing from beneath the foot, said pivotal connection between the foot portion and shank including spaced upwardly projecting inenibers carried by the foot portion adapted to engage recesses in the shank, and a rod eX- tending through said shank and upwardly projecting portions.

4l. A felling presser foot for sewing inaehines 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 at the forward end thereof disposed so as to receive and nr cu.

guide the interfolded portions of the fell seam, said foot port-lon having means for engaging theinterfolded portions of the fabric sections with a uniform pressure in rear of the needles and from a point adjacent the needles to the rear of the foot during felling when the fabric sections are fully beneath the foot portion, and for yieldingly clamping and feeding the enchained thread loops between stitched articles andy while the arti cles are entering` beneath the foot and passingy froin beneath the foot, said pivotal Connection between the foot portionrand shank including spaced upwardly projecting ineinbers carried by the foot portion adapted to engage recesses in the shank, a rodextending through said shank and upwardly projecting portions, said shank at the outer sides thereof having directly beneath said pivot, beveled faces disposed in frontand in rear of the pivot, and adapted toiengage, respectively, the upper face of the foot portion for limiting its swinging' movement.

5. A felling presser foot for sewing niachines comprising a supporting shank, a foot portion pivoted to said shank, said foot portion having a needle opening therethrough and a channel init-s under face at the forward end thereof disposed so as to receive and guide the interfolded porti-ons of the fell seam, a yfinger located in the channel in rear of the needle opening' and pivoted to the foot portion, a spring engaging the finger for nor-y inally depressing the forward portion thereof, an adjustable stop screw carried by the foot portion and lin'iiting the upward moveinent of the linger, said finger being shaped and disposed so as to engage the interfolded portions of the fabric sections with a uniforni pressure frein a point in rear of the needle to the rear end of the foot, when the fabric sections are completely beneath the foot portion, and for yieldingly engaging and clanujing the enchained thread loops against the throat plate and cooperating with the feed in the feeding of the enchained loops when yan article is passing from beneath the foot between stitched articles, and when a new article to be stitched is entering beneath the foot.

6. A felling foot for sewing machines coinprising a footportion having a channel extending lengthwise thereof for guiding the interfolded portions of the fabric sections for felling, a finger rlocated in the channel and pivoted to the foot portion adjacent the rear end of the foot, a spring engaging said iinger and normally depressing the forward end thereof, a stop screw carried by the foot portion and engaging' and limiting the upward movement of the forward end of said finger. 7. A felling presser foot for sewing inachines comprising a foot portion having a channel extending lengthwise thereof for guiding the interfolded portions of the fabric iso 4 .ifwanoeaV sections, a finger located in said channel and pivoted to the foot portion adjacent the rear end thereof, said finger terminating at the needle opening in the foot portion7 a spring bearing against the finger for normally depressing the forward end thereof, and an adjustable stop screw carried by the foot portion and limiting the upward movement of the finger through the action of the fabric 10 sections thereon.

8. A felling presser foot for sewing machines comprising a supporting Shana, a foot portion having a needle opening therethrough and a channel in its under face disposed so as to receive and guide the interfolded portions of the fell seam7 yielding devices carried by the foot portion for engaging the interfolded portions of the fabric sections when the fabric sections are fully beneath the foot 2o portion and movable beneath the plane of the lower face of the presser foot when said foot is raised for yieldinglyv clamping and feeding the enchained thread loops between stitched articles while the articles are entering' beneath the foot and passing from beneath the foot, and means for limiting the upward movement of said yielding devices whereinVT said devices are held in rigid relation to the remainder of the foot while felling the interfolded parts of the fabric.

In testimony whereof7 l afix my signature.

NORMAN V. CHRISTENSEN.

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