US1457547A - Attachment to sewing machines - Google Patents

Description

June 5, 1923. 1,457,547

' R. NETTER ATTACHMENT TO SEWING MACHINES Filed May 17, 1921 Patented .lune 5, i923.

UNiTE stares mm1. Nnm'rnn, or

NEW YORK, N. Y.; ADELAIDE FOLLET NEr'rEn sArn miranti. Nn'rfrnn, Dncuiisni).l

f ATTACHMENT 'To SEWINGA MncHiNEs.

AApplication mea may 17, 192i. seriai No. 470336.

To aZZ whom t may concern.' f

Be it, known that I, RAPHAL Numa, a citizen ofthe Republic of France, residing at New York, county of New York, and State of New" York, have invented certain: new -and useful Improvements in Attachments to Sewing i achines, of which? the following is a full, clear, and exact description.

Sewing machines at the presenttime are generally Iprovided with attachments known as hemmers, which consist of spirally formed folding guides designed 'to be secured in ad@ vence ofthe needle and feeding mechanism' whichoperatev lto fold over the edge of a: piece of fabric before it reaches the needle to yform a true hem or the-edges of two su erposed fabrics to form a fell. Y 'I uch devices usually require lthe workvof a skilled operative, as it is very frequently the case that the edges of the vfabric are not tempts havebeen made to'de'vise and operate such a device, until Idesigned and appliedv the corrective appliance for this purpose which forms the subject of this application 40 for Letters Patent. This new devicey as l have designed'it,lconsists in a cuttingr cie# vice which is appliedin y ofthe feed mechanism and needle and at the entrance to the folding guide, which ycuts from the raw edge of an vintroduced yfabric 'a narrow strip, along aline which leaves'a straight edge or `has always a definite relation to the foldededge`v that passes `to the needle. Y' n v l front or iny advancey yPractical considerations require that' a cutting device be'operated by the machine itself-and'atv a proper speed.; that it occupy but'little space; that it, shall be capable of l long-continued use without' attention; and; thatv ity that itV beso designed and operated takes from the 'operativethe' vburden of skill! ful manipulation. These' v`are problems 'that iixnculminationy i' haw been by nomeans easy of eolution,butv :if 'i IE have vsucceeded in solving them' and-:pro-v l ducing. val simple, durable'and very 'highly efficient attachment for the purpose.

In carrying out' this invention attach in any suitable manner to the .machine agout# ting devi'cevhaving a fixcdand an ,oscillating-` or reciprocating member, @at vor near *the point where the introducedlfabric:entersfthe folding spiral of 'the henimerfhguider, 1'The proper movement yof vvthe 'reciprocatingmeme ber is secured by connections hereinafter 'dei scribed, to a suitable member of thesew ing machine', such as the 'rocker lshaft]which`V usually lie's'Yunder the table and which'raise's the movable member of the feed mechanism, and these connectionsare' so Constr-neted:and

designed that the reciprocating cutterl member ,is moved to out the fabric'whifle'fthe i feed mechanism ofthe machine isatrest'fV This' vimproved attachment I have shown in'detail i'n thev accompanying drawings,n in` what:

Figure' lis' a'sectio'nal view ofthe"es'seril vtial parts of a sewing 'machine showing impmved attachment, applied thereto."

1 lFig.r4 '2 lis. a sectionalv 'detail' of the, cutter` device-andas'sociated parts onthe lineQF-Q of F'igjgt v Y,

showniin'Fig. '1, and c l Fig; 4 is-averticaldetail on the line :4%4

'The improvement i`s` concerne"diincidentally only'with the'pla'nof Aconstruction of y the lsewingmachine asfafwhole, and Itlrat shown-may lbe regarded' as 'typical yof*y I the i `form toffwhich it? is 'or 'may' be'fapplie'ld. F. n sueh'machine 'fis the'table, 2 sthe presser foot, 3 isthe needle-under'awhichfis'the' proper feedmechanisni, andunderthe table;

- truer-he..

is above stated, the lfLW @dgofthe fabric' i es.. by; e) Serew 13,v te.Y the, erm

v. To effect suclioperation by power derivedin this case, are tWo rocker shafts 4 and 5, the former oscillating the feed bed 6, the latter raising the same, in av manner familiar to all who are skilled in the art.

When this or any similar sewing machine is to be used tov hem, a suitably formed spiral folder, guide is secured to the table in advance ofthe feed mechanism and needle, and in using this device the edge of the febrete belierimeel. ispeseeeinte the. guide unfit iesfairen holdA -Of by the @spinning and reciprocating feed bed `and thereby passed under the needle. InI passing through the guide 7 the edges are`fold'eduiider and over so that the line ofstitches is along thed folded portions and the latter issue as a is apt tobbeJ uneven AWith,resulting imperfecf tensfr the finished. hemmedfedge. lather@- ORQ. SQQLLITQO the. table. in. any proper4 manner, aswbysreyv; 8 al Ufshapedv support. 9y in stationery. These partsV which iseeeured bye sereni@ the member. 1.1 0f e Cutting deviceare`4 secured ati the entrance to the spiralv felderI guide@ the edge. ef. the member. l1

being adjusted., properly' with reference tof the n'iovable memberI ofthe cutter, 12 sothat the lineof out vvyillbe sufliciently into the fehieftetele. eere. et any. irregularities, that erelkelrteeeeur,inthe rev edge The 'saidlmoyable member 12 is, clamped, A' 1li of a rock shaft lzlpa'ssingi through, a cylindrical guide 1.6.5,". A v'111112.47 through uheh said shaft peeeesieeereuedinte the end= O-f'thie Cylinder. and etvgeen saidnut andv a,l shoulder on thel reelaehefts e'A spireli Spring 18, which.. exe erts sufficient pressureupon the shaft to keep theyknifeblade 12Min proper positionI ifelaitirely *lathe fixed. member ll l The function of the rock shaft 15 is to oscillate, ory reciprocat'ej the knife blade l2, causingmitin cooperation with the stationary/,knife member llyto cut the fabric durnghe, intervals efifreet ef the Seid fabriefromthe machine is, anice problem, The IrlQFeIelltS. must be. eXeCtly timed end must occur Wuithl the'A samel rapidity asthe oscillations, of the needle, andthe most practicable Waylwl have found for accomplishing this is to operate the movable knife by the intermittently, moving, rocker shaftv 5, which lifts the feed bed 6. For this purpose, I- sef Cure to the said shaft. 5 a bracket l9 by any suitable means, and connect the extended, arinvofV such` bracket by a, link,20 with a. lever 2l, p fiyoted.` atA 22Vto a stationary, part ofthe machine, and connect said lever2l by a link 23ltoan arm 24, fixed vto therock shafty l5.

.By thismeans' as the rocker bar 5 oseillates,

i an1.oscillatory movement.' of sufficient extent is 'imparted to the shaft 15 to` operate the knifeblade l2 andas the shaft 5 isstationary at the moment when the feed bed 6 is at rest and the needle moving, the movements of the knife will be properly timed.

Certain special provisions and details are of prime importance and should be carefully taken into consideration. To vary the throw of.4 the, knife blade l2, for example, tocompensa-te for possible Wear or other contingencies due provision should be made for varynethe peint et eereeetien betweeethe link 22a-and, the '1eyer'a'1-L/igain, in Order that the line of'cut should be at the proper point, the knife blade 12 as shown in Fig. 3, should be offset andenter a cut-away part in the side of the spiral; guide 7 back of the opening or mouth of the said guide, which mouth serves to hold the fabric during the` cutting,A operation. While the topvvall of the guide acts asy a stripper. With this construction. no, special feed dog or other feedr mechanism is. required in advance of the cutter and guide. Furthermore the said knife blade should be normally in such position that it will-ah Weyslie over a corner of thejstetenery. mem,- bei ll to insure the proper relative positions, of these two members at all times. Finally, it will, be obSrvel that suitable provisionis mede for the adjustment ofthe. t .nsien et.; the springlS, by the nut Hand for thewadjustment of the stationary knifermember, 1l with. respect,A to the` other parte with` whieh it isr associated.. Y

With thisA machinel theL edge, of anyI falo-ric which is to be hemmed,isjpassedinto, the,

It is not essential that the knife blzulejbe.

Operated by the epeee mee-11S.l herein` ehem, althpugh thesevare the mostlpracticablethagt l have, thusy far found. Nor-is tliejinyenrV tion limited tothe specigform or charagtei; of the` means employed for carrying .out the desired end etetely ebjeeteef my inventee.

`What I, claim is:

l. The combination` with a. seyvingma; chine enel e e111:` felding; guide. ettelehed, thereto, of a reciprocating` knife located.l in advance of the needle and in a cutaway-por, tion yin the side Vof, said vguide. back, ofthe, mouthI ofI the same, and means driven, bya, moving partofthe sewing machine, fortre-` ciprocating said knifeisdthat itwill (xiii/offl from e, fabric introduced, into the. guide@ narrow ,straight edge, strip. f

2. The combination with a sewing.ma,-

AsY stated above, if two,

chine and a hem folding guide attached thereto, of a cutting device consisting of a stationary and an intemnittently reciprocating blade located in a cut-away! part in the 5 side of said guide back of the mouth of the same, connections between said reciprocating blade and the intermittently oscillating rocker bar that lifts the feed bed, Jfor operating the said blade during the intervals of reet of the fabric and means for adjusting 10 the relative positions of the two members of the cutting device and the throw of the reciprocating blade.

In testimony whereof I hereto affix my signature.

RAPHAEL NETTER.

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