US1283437A

US1283437A - Lock-stitch sewing-machine.

Info

Publication number: US1283437A
Application number: US18197117A
Authority: US
Inventors: Frederic S Williams
Original assignee: Individual
Current assignee: Individual
Priority date: 1917-07-21
Filing date: 1917-07-21
Publication date: 1918-10-29
Anticipated expiration: 1935-10-29

Description

F.A S. WILUAMS,

LOCK vSlCH SEWlNG MACHINE.

APPLICATION man nuLY 2l.\9|1.`

1928,43?, Patented m29/,1918.

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F. S. WILLIAMS.

LOCK STITCH SEWING MACHINE.

A PPucAUoN FILED JULY 2l, lan.

4 SHEETS-SHEET 2.

Patented Oct. 29, 1918.,

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F. S. WILLIAMS.

LOCK STITCH S'EWING IVIAC'HINE.

APPLlcAnoN FILED JULY 21.917.

1,283,4372 Patented Got 29, 1918.

4 SHEETS-SHEET 3- F. S. WILLIAMS.

LOCIISTIICH SEWING MACHINE. APPLICATION FILED IuLY 2l. Ism.

Patented Oct. 29, 1918.

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EREDERIC si WILLIAMS, E BEooimYnV -NEW YORK, AssIGNoR To `FREDERICK KLEIN,`

i TRUSTEE, or NEWYORK; N. Y.

I LOCK-STITCHLSEWING-MACHINE.

To all whom it 'mayfconcern Be it known thatl', FREDERIC S. "WiLLiaMsg a citizen ofthe UnitedV States, andresideiit ofvfBrooklyn, county offKings, and State of New York, f have invented `Certain neW and useful `improvements'` in Lock-Stitch Which the; following` is SeWing-fMaohines, lof a specification; i

My invention relates more particularly AYto lock-stitch sewing machines provided with a hollow"` Worksupport Macross the 'top of which theV Work' is adapted* to' be fed by` means of suitable mechanism preferably con- L nected with and 'operating as a presser-foot. A- `vertically 'reciproeating` 4needle`^is provided; adapted to pass through the Work'and enter 'theupper end: of' thehollow work support `andfo-rm therein, below the Work, a loop of the needle thread. In this type of machine', the shuttle or bobbin-hook andthe bobbin are located near the lower end of the hollow Worklsupport, and a simplement-al hook is provided for :drawing the needle-f thread loop down into ,position to be engaged by the-1 looper which l preferto'oall a bobbin-hook5"tlie shuttle orbobbin-hook being adapt`ed,'inthe usual orany suitable manner to Ipasst-he bobbin through thelloop;

ln operating machines ofjthis" type7 pararev apt to be formedon the underside of the work, .which frequently Vresults in breaking the 4threa`.d,na.nd sometimes in breaking the needle, This not only lproduces defective Worin," but the frequent interruptions from the breaking of: thread and 'needles' seriously aliects the output of tliefmachine.

The obj ect of my improvement, is to "provide meansfand ftO sol Cordinate the mechanism asfto eliminatethese` difficulties and provideV a' -i'nachine Capable of producing szuiisfaetory Work at high speed operation.

Then the eye, of the needle is` directed transversely' of the, line of feed of the World as is usual in this type of sewing machine, and after the 4bo-lobin has been passed through the loop and the -feed taken place, then during thesubsequent drawing up of the long loop Specification of `Letters Patent.

ferred to,` I preferably employ in oombinav Patented Oct. 29, 1918.1,

Application.filed` Ju1y'21, 1917; Serial No. 181,971. i

over the edge ofi-the groove leading to the eyeof theln'eedle With the result that .the

y needle thread is partiallylamtwisted,by the strain. Obviously these objections Will be more apparent when thel machineisoperated at highispeedf. VIt `Will be understood that one strand of the long loop of thread is subi stantilly stationary, While the other is -rap1dlydrawn up through the needle by the take-up n'ieohanism'tof lock the stitch'. If twisting of the strands ,one upon the other .occurs,lthe upgoino" strand ivill tend to draw the other one along -With it "and thereby form knots and small loopson the underside i of the wor t. `The take-upmechanism being -i of the needle thread,`the thread`4 is' drawn.

adaptedtotakeup1,certain length of threadA Will therefore exert an undue 'amount of'pull upon the need] e'thread when {such} loopsr lor knots fare formed, \viththe result that the thread weakened and frequently breaks. The `strain `at times may belso great as to cause the breakage of the needle. i

In my improved machine, this diflioulty is y substantially lcompletely obviated by placing thefeye of the needle in the direction of the -lineof feedof the Work, thereby :perl

V`mittingthe formation of theneedle-thread l loop in a vertical plane through the line of l feed. falso provide a supplemental hook adaptedto oscillate transversely of the line i "of fe'edto engage the needle-thread loopuat theneedle the supplemental hook being` adapted to be moved `downward in a substantially vertlcaliilane and to maintain the strands? of the loop in parallelrelation untily engagedby the shuttle or bobbin-hook. By` this means, the needle-thread is at no time drawn transversely Vor angularly across the groove ofthe needle, thus obviating unequal pressures on the sides of the needle-thread, which as previously explained would tend to cause the thread to untwist slightly.` By placing the eyeof the needle parallel -With the line of' feed of the worln'itfwill be seen that vat all. times the thread is moving inthe same plane, which is substantially the )lane of thestitoh being formed in theworlk.

In addition to the means hereinbefore re-V tioii` therewith" a blade or `other suitable means preferably eX-tendingfrom thebob bin- Casey up into the hollow Work-snipport for positively separating` theftwo strandsof.,

the needle-thread loop and guiding theloop as it is drawn up by the take-up mechanism to complete or lock the stitch. In the form of device shown and described herewith,

this comprises anarrow blade of thin sheet metal adapted to extend from thebobbin-oase up into the hollow work-support, the upper end of the blade extending practically to the top of the hollow support, or to the underside of the top end thereof through which the needle is adapted to reciprocate. The upper end of the blade is preferably bent along its length, so that the upper and lower portions are substantially at right angles to each other, the upper portion being in a plane substantially parallel with the line of feed or parallel with the stitches as formed. This blade is preferably adapted to be connected with the bobbin-case, and prevent the latter from rotating, the bobbin-case being located central` of or on the axis of the oscillating shuttle or bobbinhook.

The type of lock-stitch glove sewing machine to which my improvements arev particularly adaptable, is a machine substantially along the lines of the machine described in the Wilkes Patent No. 1,049,430, of January 7, 1913. The Wilkes machine, however, while working satisfactorily at low speeds, and with careful handling, is not as satisfactory when run at high speed under commercial requirements. Machines of this type are used for making what are known to the trade as pique gloves, and since in gloves of this type, the seam formed is overlapping, it is particularly necessary that it should be neat in appearance. If knots and loops are formed on the underside of the work, and the thread is frequently broken, it is obvious that a neat seam will not be produced. Therefore, the desirability of obviating these objections and difficulties is apparent and my improvement in the arrangement of the needle to form the loop in a plane through the line of feed and providing means within the hollow work-support for separating the strands of the loop and guiding it as it is drawn up to lock the stitch, have been found to satisfactorily solve these difficulties. The result is that with my improvements, the machine can be run at a high speed and produce satisfactory work.

While I have shown and described my improvements in connection with and as particularly adapted to a glove sewing machine, it will be obvious that by suitable changes in mechanical details, machines of this type can be used for sewing other goods or articles.

One form of my invention is more par ticularly shown yin the accompanying drawings in which Figure 1 represents a side elevation of a lock-stitch glove sewing machine embodying my improvement, certain parts being shown in section. Fig. 2 represents an enlarged vertical section through the hollow work-support showing the relation of the supplemental hook and the bobbin-hook thereto. Fig. 3 represents a transverse vertical section substantially at right angles to that shown the upper end of the hollow work-support at right angles to theview in Fig. 5, showing` the parts in the same relative position as shown in Fig. 5. Fig. 7, presents a view similar to that shown in Fig. 5, representing the needle-thread loop drawn down by the supplemental hook into position to be en gaged by the oscillating shuttle or bobbinhook. Fig. 8 is a similar view, showing the needle-thread loop` as itV is being released from the oscillating bobbin-hook and drawn up the hollow support. "F ig 9 is a top view of the mechanism under rthe bed plate. Fig.. 10 is a similar view to Fig. 9 with some of the parts shown in section or broken away. Fig. 11 is an enlarged detail view of parts at the left in Fig. 10, and Fig. 12 is a detail of a pivot bracket. .Y

Referring to the drawings, and more particularly to Fig. 1 thereof, the machine is represented as provided with bed plate 1 upon which a pillar 2 is mounted, from which extendsthe usual overhangin arm 3, adapted to support `and form bearings for the vario-us mechanisms inclosed therein or mounted thereon. The construction and driving mechanism may be of any preferred form and in the present machine, a drive or pulley wheel 4 provided with the usual fly wheel 5 is attached to the main shaft 6 and adapted to be driven by power in the usual or any preferred manner.

A bracket?- is mounted upon the arm 3 and provided with means for holding a spool of thread at 8. Another bracket 9 is mounted` upon the arm 3 and provided with tension disks 10` and guide members 11 over which the thread from the spool 8 is adapted to pass, as indicated in Fig. 1 of the drawings. A tension spring 12 is also mounted thereon, and guide hooks 13 and 14 through which the needle thread 15 passes on its way to a pulley 16 on the outer "end of a lever arm 17 y forming the take-up mechanism. This mechanism is substantially the same as that shown and described in the Terwillicfer application, Serial No. 31,144, Afiled, lVay 29, 1915. From the take-up mechanism pulley 16, the needle thread 15'is lead. over a pulley 18, iixedly supported on the arm 3 at the outer end thereof, substantially above the needle. From the pulley 18 the thread l5 is conducted downward through ahrunway 19 and then to and through the eye of Athe needle 2.0. l.The needle 20, inftheherein described form.` of*` my improved sewing `machine is mounted in theneedlef bar 21 in such a manner, that a line through the eye of the needle is parallel with the line off feed, or from front to back as viewed in Fig. 11 of the drawings. The arm 3 is also adapted to support a presserfoot 22, which in the present instanceis utilized,.as the feed mechanism for advancingthework, stitch by stitch as required. in sewingmachines. This feed mechanism is operated by levers` 23, and connected with the, main shaft 6 within the arm 3 in any suitable or preferred manner. An arm 24 is provided for lifting the feed presser-foot 22 out of contact with the work when so desired. Theldetails of this feed mechanism need not be described here in that they form no part .of the present invention.

A hollow work support 25 is mounted upon the bed 1, being secured theretozby a wide `circular flange 26 forming the base-of the hollow support. The upper end of the hollow support is preferably slightly conical at `27 and. closed by an .end piece28 provided i adapted to provide space for mounting therein `a sheet metal blade 31 adapted as hereinafter described, to separatethe strands of the needle thread Vloop. and guide the loop as it is drawn up through the hollow support to complete or lock the stitch. The

upper end33v ofthe blade 31 is preferably bent along its 'lengthlat right angles to the lower part of the blade,the bend being indicated at -32 inv Fig. 3 of the drawings. The

upper endV 33 of the blade, preferablyextends nearly to the end plate 28 at the upper end of the hollow woi'k-siqoport and lies parallel tothe lineof feed or to thestitches, as will be seen in FigV 3 of the drawings. The lowerfend of the blade 31, at 34,` is bent outward and then inward upon itself `to lie substantially in a vertical plane atright anglestcthe upper portion 33 of the blade. Thisvvertical'ly' disposed lower end 35 of the 1- bladeh31 is preferably enlarged or disk secured 'to thescillating looper or `bobbin` hook37; atl the aXis thereof. The back of the shuttle orbobbin-hook 37 isprovided with aV tongue `memlier33 (see Fig. 4), from which the stud 36 projects to the right as seen in Fig.

preferably parallel witha vertical uplane end of theblade 31 is fiXedly` held at the axis of the bobbin-hook and the blade is adapted tovprevent rotation of the bobbincase 41, while the bobbin-hook 37 is permitted to oscillate in the usual manner. Within the bobbin-case 41, there is revolubly mounted a bobbin 42 or other suitable means for providing the under thread for completing `the lock-stitch. Preferably, the bobbiii thread 43 passes out through a hole at 44 in the bobbinwcase and after passing under a suitable tension spring or eye45`, is led up through the tubular work-support to the work, as indicated in Figs. 3 and S of the drawings. The bobbin-hook 37 is provided with a hook or point at 46, and is adapted to oscillate in a plane at right angles t0 a vertical plane through the line of feed of the work. `In order that the shuttle orbobbinhook 37 may oscillate in this manner, it is provided with a flange at 47 'adapted to bear in a raceway iii an annular bracketV 4S secured to and dependent `from the underside of the bed plate 1 as indicated in the drawings. The bobbin-hook is preferably held in position in the raceway by plates49 and 50 secured to the bracket 48 by suitable screwsV V51, as will be seen fromthe dra-wings. The

raceway 4S is preferably formed 4of two V parts hinged at 52 sotliat the lower part thereof may be swung back to release the bobbin-hook 37 in order that the latter, ton

gether withI theY bobbin'- case 41 andthe blade 31 may be removed. vAstud or a bolt 5 31is provided for locking the hinged portion of the racew'ay 48 in normal position with the bobbin-hook in operative position therein, as indicated in Figs. 2,3andv 11 of the drawings. 1

The shuttle or bobbin-hook 37 isoscillated at the proper time by a shuttle driver 54 of the usual or any preferred type.

The shuttle or bobbin-hook driver'54 is represented as provided with an `arni (see Fig. 4), carryinga collar member 56 adapt-` ed to"be securedby means Vof ascrew 57 (see'Fig. 3) lto the enlarged head orend 58 secured to a shaft 59 mounted by means;

of ballbearingsdand 61 in abracket 62 depending fi'ointhe underside of the bedV plate 1 as indicated in Figs. 3, 9 and 10 of the drawings. `The shaft is preferably driven by a pinion G3, secured thereto, which in turn `preferably `meshes with a segment i so 64, carried on the (outer end of a lever 65 (see Fig. 1), pivoted at 66 in a bracket 67, secured to the underside of the bed plate l, as will be seen in Figs. 1 and 9 of the drawings. `The rock lever 65 preferably extends beyond the pivot 66,' Ato form an arnr68, provided with aV roller 69 adapted to 'follow the groove of a cylindrical cam 70, the construction being such that the shuttle or bobbin-hook driver 54 is oscillated in pro-per synchronismwith `the needle and other mechanism of the sewing machine. `The cylindrical cam 70 is secured to a shaft 71 preferably extending vertically throughv the pillar 2 and connected to be driven from the main shaft 6 in the usual or any .preferred manner.,

I have described the oscillating shuttle or bobbinhook 37 as located below the mouth or lower `end of the tubular worksupport 25 in the .upper end of which the needle 20 is adapted to reciprocate in order to form within the upper end of the hollow` support a needle-thread loop in the ordinary inanner. It is necessary, however, before the bobbin canbe passed through the loop, for the loop to be drawn down through the hollow support into position to be engaged by the hook 46 of the bobbin-hook 87 which, by oscillating, is adapted to carry the loop over the bobbin-case and thereby pass the bobbin through the loop.

For this purpose a supplemental hook 72 is preferably provided, as indicated in the drawings (see Figs. 2 and 11) and adapted to slide vertically in slide-ways 7811i a pivoted rock arm 74. VThe rock arm 74 is preferably provided at its lower endlwith a stud 75 (see Figs. 3 and 12) provided with a ball 76 secured between the concave ends of screws 77 kcarried in a fork 78 adjustably secured in the lower end 79 of the bracket 62 hereinbefore referred to as supporting shaft 59 connected with the shuttle driver 54. The supplemental hook member 72 is of sufficient length to reciprocate from a point adjacent thehook v46 of the oscillating bobbinhook, up into. the hollow work support into position to engagethe needle-thread loop formed at the needle in the upper end of the work-support as indicated in Fig. 5 of the drawings. The lower end of the hook member at 8O is preferably bent outward and provided with a ball head 81 as represented by dotted linesin Figs. 1 and 2 of the drawings. This ball head 81 is preferably adapted to enter a cylindrical socket 82 on the outer end of a rock lever arm 83 as indicated in Fig. lof the drawings. The rock lever 83 is preferably pivoted at 84 in abracket' 85 secured to and depending from the under# side of the bed plate 1. The rock lever arm 83 isconnected with an oppositely extending arm 86 (seeFig. 1) provided with a roller or pin 87, adapted to follow ythe groove in a cylindricalcam 88", secured tothe lower end ofthe vertical sliafti'l, as indicated in Fig. 1 of the drawings. The bracket 85 is pref.- erably provided Vwith a-laterally extending arm or lug 89 adaptedto'forma bearing vsupport 'for-the shaft 71 (see Fig. 1)". The groove in the camA 88.` is adapted to oscillate or rock-the rock arm 88 at the propertime and the properdistance .to carry thehook72 from the position indic'atedin Fig. 2 of the drawings upthel hollow work-support `into position to engagetheneedle-threadf loop at the needle substantially as indicated'in F ig.V 5- of the drawings. f l` ."The supplemental hook 72 is adaptedto not only slide upland down in the -hollow work-support 25, but, at the propertime, is adapted to be moved bodily Vabout `the bear. ing stud 7 5` to carry the upper hookV thereof out of the path of theneedle and the needlethread loop while'the hook 472V is'ascending the hollow work-supportJ 25.` `Vhen the supplemental hook 72 reaches the upper end of the hollow wor support, xitqis. adapt* ed to be moved transversely ofltheneedlethread loopv to engage the .latter substantially as indicated by'` dotted .linesinFig 5. To give to the supplemental hook 72 this.

vibrating movement, a collar 90 isl pivotally mounted upon a screw stud 91 as indicated 1n Figs. 2, 3 and 110i' the drawings A fork 92 is connected to the collar 90 and is sldably and `pivotally mounted in aV bracket 93 secured tothe underside of the bed plate 1, the bracket preferably secured to` or forming apart of Vthe shuttle-racebracket 48 herenbefore referred t, astud or pin 93a being provided .to act as a pivot inpthe'slcft 92l in the member 92. The opposite end of( the fork member 92 is provided in the present instance with a nut 94adapted to form a socket' for a ballhead 95 onthe end of a pitinan or link 96 pivotally connected at 96aL with a lever or rock arm 97 pivoted at-98 in a bracket 99 securedto and"depending from` theA underside ofthebed plate 1 as indicated 1n Figs. 1, 9 and 10` of the drawings.V The rock lever 974 is preferably provided with a suitable pin or roller 100 engagingl a groove 101 in the surface cam or disk 102. The cam-disk 102 is secured to the shaft-71 and driven thereby,the relations being suchas to move the upper end of the supplemental hook- 72 transversely at the proper time.

The supplemental Vhook 72 is also adapted,

to be given another movement substantially atright angles to the transverse movement just described. This willbe best understood from Figs. 3 and 11 vof the drawings, the

supplemental hook 72being adapted to be. moved outward andtoward the right as shown in Figs. `3 yand llof the drawings in Y order .that the point 46 ofthe shuttle or:v

oscillating bobbinlhook `passi-the hook arm when the shuttle is oscillated tofcarry;

the needle thread loop'down and pass the bobbin 42 in:v the? "bobbin case 41,` therethrough. This movement is accomplished by pivoting at 103 in the tubular portion 103a of the bracket 93 a rock lever 104 pivotally connected'atlO (see Fig. 1l) withV the fork m`e1nbe1a`92'as indicatd in Figs. `2 and 390i: theY drawings. By this means it will be seen that the supplemental hook 72, whenthrown over toward the left as seen in Fig. 2, will be moved inwardY or back away from. the observerA andv in 'position tobe moved `upward through the hollow work support QtsubSta-ntially"asindicated in' Fig. 5 of `the drawings. :The cam disk V102 is then adapted to move the fork 92 toward the riglrt andathereby swing the supplemental hook 72` into; the dotted line position ofFig. 5` and engage thelloop of the needle thread at `the, needle.

VVVhentthe supplemental hook 72 is drawn down the hollow support 25, the bobbin hook 46...tirstrmoves` to theA position shown in Fig; 7 to engagethe" needle thread loop. The Shuttle orbobbin hook iis 1 further 'oscillated totheposition shown in Fig. 8. During the latter part of lthis movement the member 92 is drawn with@ right sau farther and, areV link 104 moves the slide arm 74 outward to clear the shuttle hook 46"a`s willbe seen in Fig. 11 ofthe drawings.

The operation' of my improved machine should be readily understood by those skilled in the art from. the above description, but I shall brief-1yA state 'the operation and trace the movement ofthe needle thread loop,`

When the needle 420" has l penetrated the work on the end oft-he hollow work support,

its carries theneedle thread down intoV the hollowwork support and then as is usual," the needle starts upand the needle thread loop is formed substantially" as ^indicated in Figs.: 5 Aand 'ofzthe drawings; The eye being parallel with the Aline ofeed, the loop is formed ina vertical plane through the line of feed. i Inthe drawings (Fig. 5) the` loopisslightlydisplaced tothe `right to render itvisiblef The supplemental hookat this time enters or has `entered the needle thread loop atthe needle'Y as indicated in Fig. 6 of the'fdrawings, and the needle isA withdrawn from'the work. at the same time thatthe supplemental hook v72 isdraWn down through the'hollow support to the position indicated in Fig. 7 of the drawings. In this posit-ion, the .needle thread loop is shownas engaged by the-hook 46 of the shuttle or -bobbin'hook uand is about to be carried off of the supplemental hook 72. The shuttle driver 54 `osc`illateswthe bobbin 'hook Ito the positionindicated in FligxSi ofV the` dra-wings thereby permitting the needle 'thread loop' A tobe released from the hook and pass up between the shuttle 01: bcbbin hoek and `thedrtmr 54T, the loop, in sopdoing, inclosing the blobbin thread 43- andthe lower end of the blade 'The take-"up mechanism 17 then draws the threadfup through thework, the strands of the loop A, being prevented from interference by the blade 31*33, the upgoing strandA ot' theloop adapted to follow along the `edge of Vthe blade. The upper end 33 of the blade 3l`33 as previously described, is atan angle to the lower end 3l and lies 75 parallel to the line of feed'thereby permitting the loop to be drawn` off the upper end or the Eblade in the correct position for com* pleting the stitch. "The blade is thus adapted to prevent interference or contact ofjthe rapidly moving upgoing strand of the loop with the strand of the loop connected with the previous stitch. As will be seen in Fig. 5 of the drawings, the upper end 33 of the blade is adapted to move outward toward the hollow workV support in order to give clearness for the supplemental hook 7 2. When, however, the needle thread loop A is being drawn up to close the stitch, the blade assumes thel position represented in Figs.- 7 and `8,7the upper end however, being out of line with the path of movement ofthe rcciprocating needle. As the shuttle 37 turns to the position shown in FigspS and 11, the l link 104" will cause` the hook slide arm 74 to 95 be` moved out sothat the bobbin hook 46 will pass without interference.v

I have found the mechanism of my. im-

proved glove sewing machine, `as herein described, particularly adapted for highspeed operation, the blade 31-33 performing the functionl of preventing interference between the strands of thelloop, thereby assisting in preventing the formation of knots or loops on'theundersideof the work and permitting 105 more continuous operation of the machine.`

Itwill bel understood that I `have shown and described one4 form otmv improved device, butobviously, Ido not wish to be limited to this `form for various modiiications in the specific details of construction may be y 'lade' by those `skilled in the `art without departing `from the spirit and scope of the in- Y vention. For instanceathework support in the form of a tube, may, in many instances,

2. In a lock-stitch sewing/machine. pro.- vided with take-up mechanism, the 1combination with Aa hollow worksupport in the upper end of which the needle thread loop 1s adapted tobe formed, of anl oscillating bobbin hook near the lower end of said support,

ra supplemental hook for drawing said loop Vdown into lposition to be engaged by said bobbin hook and means in said hollow' support'for separating the strands otl the loop while it yis boing drawn up by said take-up to loci; the stitch. i Y' 3.*In` a lock-stitch-Vsewing machine the combination ofarhollow work support, a bobbin case, a bobbin hook and a blade or finger secured to said case and extending loeyond the circle of movement of said hook, said blade being within said support and adapted to separate the strands of the needle loop after the bobbin has been passed therethrough. c

ll. In a lock-stitch sewing machine the combination of. a hollow work support, a bobbin case and bobbin hook, a supplemental hookadaptedto reciprocate to draw the needle thread loop down into the path of said bobbin hook and ablade attached to said bobbin case for separting the strands of the needle loop and preventing them from twisting together as the loop is drawn up after passing the bobbin'` therethrough.

5.' In a 'lookestitch sewing machine, the combination of: a hollow-work support, a bobbin case and bobbin hook, a supplemental hook adapted to reciprocate in said hollow support to draw the needle thread loop down into the path of said bobbin hookl and a blade attached to said bobbin case and eX` tending into said hollow support for separating the strands of the needleloop andlpre.-`

venting them from twisting together as the loop is drawn up after passing the bobbin therethrough.

6. In a lock-stitch sewing machine, the

combination oi a hollow work `support through the upper end of which the needle is adapted to reciprocate, la bobbin case, aV bobbin hook adapted to` oscillate concentri cally of said bobbin case, a supplemental hook adapted to reciprocate in said support. ordrawing the needle thread loop down' into position to be engaged by said bobbinA hook `and a blade extending from said bobA bincase into said work support for separating the strands of the needle thread loop after the bobbin has Vbeen passed thereup-t'o torni the stitch. t n t 7. In a lockfstltch sewing machine, the

through andwhile saidloop is being drawnr combination of a hollow work supportV through the end `of which 'the needle' is adapted, to reciprocate, a bobbin case, a bobbin hook adapted to oscillate concentricall)7 of `said bobbin case, a supplemental hook adapted to reciprocate in said work support,

for drawing the needle thread loop down into position to beengaged by said bobbin hoolnand a blade connected at one end to said bobbin case and having its free Aend eX? tending` into said work support adjacent to the walls thereof soas to leave afree path ior said supplemental hook, said blade being adapted to prevent `rotation of said bobf bin case and to serve as a guide for the needle thread loop as it isAV drawn up to `form the stitch. e w i 8. In a lock-stitchA sewing machine, the combination of Va hollow" work:` support through the upper end of whichithe needle is adapted to reciprocate, an oscillating bobbin hook near the lower end of said support, a bobbin case within and central of the path of movement of saidbobbin hook, and a blade. having its .lower end iXedly` held on the bobbin case and adapted to prevent rotation of said bobbin case, the free end of said blade extending into said support and adapted to guide the `needle thread loop as it is 'drawn up yto complete thesstitch. y

9. In a lock-stitch sewing'fmachine the combination of Qa hollow .work support through theA upper'end of which theneedle is "adapted to reciprocate, an oscillating bobbinhook near thelower'end of said support, a bobbin case within and central of the path of movementk oi" said bobbinl hook. and a blade having its` lower end transversely of and relatively fixed; on the bobbin case, its upper end being free and bent in the direction of its length to be ina'plane substantially at rightangles to its; lowerj end.

10. In a lock-stitch sewing machine, the combination ot'- `a hollow "work' support through one 'end of' which the needle is adapted to reciprocatea bobbin hook near the other endgo'l: said support, a supplemene' tal hook adapted to reciprocate between thel needle and said bobbin hook to carry the needle thread loop to the latter and Ameans within` saidr support'fo'r guiding said'. loop and preventing interference of thestrands thereof after ,the loop. leaves* the bobbin? hook and while it isbeingldrawn up to com plete the stitch. .t f "1" 1l.` In ja lock-stitclrsewing machine,"` the combinationwith a hollow work. support of meansfr for forming a needle thread loop in the upper end of said support, a bobbinV hook, means for` drawing 1'said loop through the work support to said bobbin hook, andy means within said support forguiding and controlling said `loop after itVV leaves thebobbin hook and while itis being `drawn up to complete the stitch. g f

l2. In a lock-stitch: sewingfmachie, "the combination of' a 4hollow 'work support, adapted at its upper 'end for the formation therein of.y the needlel threadA loop, the lower enlbeing open, anoscillatingbobbin hook, a Vbobbin ease within and central of the crcle of motion of saidbobbin hook, a supplemental hook adapted to reciprocate into said support and draw the needle thread loop down into position to be taken by said bobbin hook, and a blade extending unattached along the walls of said support to apoint ed to guide the loopas it is drawn up to lockV the stitch.

14. In a lock-stitch sewing machine, the combination with a needle adapted to form a loop of the needle thread in a vertical plane through the line of feed, of a hollow work support, a bobbin hook `adapted to oscillate in a plane at right angles to the line of feed, a supplemental hook adapted to enter said A support and draw the needle thread loop down into position to be engaged by said bobbin hook, and a blade extending from within the circle of movement of said bobbin hook up into said support and adapted, when said loop is released from the bobbin hook, to guide it to a point near the top of said support.

15. In a loclcstitch sewing machine, the combination of a hollow work support, a needle adapted to enter the top of said support and form a loop in a plane through the line of feed, an oscillating bobbin hook adapted to oscillate in a plane at right angles to the line of feed, a supplemental hook adapted to take said loop at the needle and draw it down into position to be taken by said bobbin hook and a blade within said support adapted to separate and guide the loop as it is drawn up to lock the stitch, the upper end of said blade being parallel with the line of feed and the lower end at right angles thereto, said blade being disposed and supported so as to permit said hooks their respective movements without interference therewith.

16. In a lockstitch sewing machine, the combination of a hollow work support,means including a needle adapted for forming the needle thread loop in a vertical plane through the line of feed, means for drawing the loop down through the support to pass the bobbin therethrough, means for drawing the loop up to lock the stitch and means within said support for separating the strands of and guiding the loop as it is drawn up to lock the stitch.

17. In a loclcstitch sewing machine, the combination of a hollow work-support, an oscillating bobbin hook, means adapted to feed the work across the upper end of said support, means for oscillating said bobbin hook transversely of the line of feed, a needle reciprocating into and out of the upper end of said support, the eye of said needle being in the direction of the line of feed of the work, thereby permitting the formation of the needle thread loop'in' a vertical plane through the line of feed, a supplemental hook adapted to engage said loop at the needle and draw it down into position to be engaged by said bobbin hook, the strands of the loop remaining in the same plane when so drawn down, and means for separating the strands of and guiding the loop as it is drawn up to lock the stitch.

18. In a lock-stitch sewing machine provided with take-up mechanism for drawing the needle thread up to lock the stitch, the combination of a work support, across the upper end of which the work is adapted to be fed, a needle adapted to pass through the work and enter the upper end of said support, the eye of the needle being in the direction of the line offeed of the work, a bobbin hook, a supplemental hook for drawing the needle thread loop down into position to be engaged by said bobbin hook, and a blade in said support for separating the strands of and guiding the loop as it is drawn up to lock the stitch.

19. In a lockstitch sewing machine, provided with take-up mechanism for drawing up the needle thread loop, the combination of a work support, presser foot means for feeding the work across the top of said support, a reciprocating needle adapted to pass through the work and enter the upper end of said support, the eye of the needle being in the direction of the line of feed of the work, a bobbin hook adaptedto oscillate transversely of the line of feed, a supplemental hook, movable vertically, adapted to engage the needle thread loop, a blade extending from the bobbin case upwardly, adapted to separate the strands of and guide the loop as it is drawn up to lock the stitch, the upper ends of said blade being parallel to the line of feed of the work.

20. In a lock-stitch sewing machine, the combination of a work support, means for feeding the work across the upper end thereof, a needle having its eye in the direction of the line of feed of the work, adapted to form a needle thread loop within said support in a vertical plane through the line of feed, an oscillating bobbin hook, a supplemental hook adapted to engage the needle thread loop and draw it down into position to be engaged by said bobbin hook, means for moving said supplemental hook u u and down between the needle and the bobbm hook, and means for moving the upper end of said supplemental hook transversely of the line of feed of the Work to engage the needle thread loop at the needle.

21. In a lock-stitch sewing machine, `the combination of a work support, means for feeding` the work, a needle having its eye in the direction of the line of feed or' the work, adapted to form a needle thread loop within said support in a vertical plane through the line of feed, a bobbi'n hook, means for oscillating` the bobbin hook transversely of the line of feed of the work, a supplemental hook movable longitudinally up and down between the needle and said bobbin hook, means for moving said supplemental hook transversely of the line of feed of the work to engage the needle thread loop at theneedle and means for moving said supplemental hook longitudinally to draw the needle thread loop down into position to be engaged by said bobbin hook.

22. In a loclr-stiteh sewing machine provided with take-up mechanism for drawing up the needle thread loop, the combination of a work support, means for feeding the work, a needle havin its eye in the direction of the line of feed of the work, adapted to form a needle thread loop within the support in a vertical plane through the line of feed, a bobbin hook, means for oscillating the bobbin hook transversely of the lineof feed of the work, a supplemental hook movable in a vertical plane between the needle and said bobbin hook to draw the needle thread loop down into position to be engaged bysaid bobbin hook, means for vmoving said supplemental hook transversely of the line of feed of the work to engage the needle thread loop at the needle, means for moving said supplemental hook vertically to draw the needle thread loop down to the bobbin hook and means within said support for separating the strands of and guiding the loo as it is drawn up by said take-up to lock t e stitch.

In testimony whereof I have hereunto set m hand. Y

y FREDERIC S. WILLIAMS.

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Washington, D. C.