US2011604A - Sewing machine - Google Patents

Description

F. ASHWORTH SEWING MACHINE Filed Nov. 10, 1932 5 Sheets-Sheet '1 iness 1 /6 Aug. 20, 1935. ASHWORTH' SEWING MACHINE Filed Nov. 10, 1952 '5 Sheefis-Sheet 2 Au 20, 1935. F. ASHWORTH 2,011,604

SEWING MACHINE Filed Nov. 10, 1932 5 Shets-Sheet 5 Aug. 20, 1935.

F. ASHWORTH SEWING MACHINE Filed Nov; 10, 1932 5 Sheets-Sheet Aug. 20, 1935. F. ASHWORTH 2,011,604

SEWING MACHINE Filed NOV. 10, 1932 5 Sheets-Sheet 5 Patented Aug. 20, 1935 SEWING MACHINE Fred Ashworth, Wenham, Mass, assignor to United Shoe Machinery Corporation, Paterson,

N. .l., a corporation of New Jersey Application November 10, 1932, Serial No. 642,057

14 Claims.

The present invention relates to lockstitch shoe sewing machines and is herein shown as embodied in-a sole sewing machine of the so-called McKay type, the stitch-forming devices of which com- 1 pri e a straight hook needle, a shuttle and atakeup, and the work support of which consists of a rotatable horn arranged to extend within the shoe and provided with a needle threading device for laying the thread in the hook of the nfifldl some of the features of the invention, however, are of more'general application, being susceptible to advantageous use in other types of sewing machines.

-;The object of the invention is to simplify and 2 improve the mechanism for operating the stitchiiorm ing devices, particularly with relation .to the take llp, so that the stitches may be formed and set uniformly in the work, regardless of varia-' tions in thickness.

5 this-object in view, one of the features of the invention contemplates the provision in a sewin machine having a hook needle, 2. loop taker and a take-up, of a new and improved arrangement iormeasuring the thread inxaccordance with the thickness of the work .by varying the action of the take-up in withholding thread while the thread is being drawn from the take.- up and the supply by. others of the stitch-form ing devices. Broadly considered, this feature of theinvention includes the use of anysuitable meansflfor varying the action of the take-up in yielding up thread. the construction hereinafterqdescribed, operating mechanism for the take'up is provided. which may be regulated to vary the action of the take-up at that time during each stitch-forming cycle of the machine in whi h e minimum Quantity ofthread is withheld from the other stitch-forming devices.

1 far as Pp cant is aware, it. is new 2,150

to vary the actual movement of a positively op.- erated take-up during the continued operationof a sewing machine without regard to the function performed, whether it be for drawing off thread, setting the stitch, or for other operations. ,From

this aspect, the invention, as embodied in the ma.-

ehine described hereinafter, comprises means for changing automatically the stroke of the take-up as the work varies inrthick-ness.

, referably the thread is drawn from'the supply by h oop t r in pas ing the locking thread throughthe needle loop. The action of thetake up, according to th pre ent arrangement is contpglled by connections to the presser-foot and a thread lock may :be provided to cause the stitch tobe set-by the ta -up while in its l wer os o maximum thread withdrawing position, In the form shown, the connections from the presser foot to the ta -up actuat n mechanism may be rendered inoperative while the work is being fed.v For this purpose the connections are arranged to yield, and means is provided for locking the connections to prevent change in the movement of the take-upywhile the Presser foot releases the work.

As is usual in sewing machines when brought to rest, the presser foot is raised a considerable distance from the work in order to release it, In the illustrated machine. means are provided for permitting the connections for varying take-up movement to operate when the machine is stopped so that upon restarting the machine the take-upmay cause a-suitable length of thread to be drawn from the supply for the initial stitch.

These and other novel combinations and are rangcments ofparts hereinafter described and claimed will be readily understood by those skilled in the art-from the following description in connection with the accompanying drawings,

in which; Fig. 1 is a view in sideelevation of a machine embodying the features of the present invention; Fig. 2 is a view in front elevation on an enlarged scale of the sewing head of the machine illustrated in Fig. *1; Fig. 3 is a view in side elevation on the same scale as Fig. 2 of the front part of the sewing head; Fig. 4 is" a detail plan view of the arrangement of certain levers in the sewing head; Fig. 5 is a view in front elevation on an enlarged scale of the take-up and thread supply devices; Fig. 6 is a view in side elevation and :on a still further enlarged scale and partly in section of a portion of the mechanism along the line 6-16 in Fig. 5; Fig. '7 is a view of the parts shown in Fig.- 6 in a slightly different position; and Figs. 8, 9 and 10 are views in front elevation of the take-up actuating mechanism in different operating positions.

The machine illustrated in the drawings a lockstltch shoe sewing machine of the McKay type, in many respects to the machines illustrated and described in the applicationkof Bernard T. .Leveque, Serial No. 169,203, filed February ,18, 1927 upon which Patent No. 1,885,927 issued November 1,1932, and in the application ofthe present applicant Serial No. 394,770, filed September 24, 1929 upon which Patent No. 1,9l l,936 issued June 20, 1933. In this machine the shoe is supported upon a rotary horn 2 arranged to extend within the shoe which is held in engagement with the horn by a presser foot 4 acting alternately-with a feed point ,6 to grip and holding devices and their actuating mechanisms; -l

' operated through a verticaldriven shaft 2i) connected by gears 22 and 24 to horizontal ha feed the shoe while the stich-forming devices I to form a seam. The stitch-forming devices comact prise a straight hook needle 8, a loop taker in the form of a shuttle I t, and a take-up l2, the needle vthread being passed through a wax pot M from a supply reel l6 arranged substantially the same as respectively. Rotation of it in applicants co-pending application for U. S; Patent sen aNo. 623,386, filed July 19,1 932 a j The ma ns em? li h were at E8, supper s the various stitch-forming and work the actuating mechanisms being ing and stopping mechanisms.

. v The stitch-forming devicesin the machinei1 lustrated act'to form a lock-stitch by passing the needle through the work and into the tipof the norm-where itkreceive s the-thfiadfiom a whirl (not-shown) tlier eafter retracting with aloop of" l thread-Which'is'spreadand engaged with the beakof t'he s'huttleg The shuttle "then 7 draws a further supply of thread through the work andpasses the needle lbop about the locking thread contained in.

the shuttle. -A ft er the shuttle has substantiallypassed through the needle 'loop the" take-up "acts to draw the thread from the shuttle back towards" the workf and as the take-up reaches 1 its -:lowermost' thread :retracting position the stitch' is drawn into tl'i'ework and Stf {r WI cording to the pre'se'ntinvention, the actuating mechanism for the take-up lever is arranged to' be regulated automatically and to'cause the stitchto beset: a uniform'distance below the surm t: the iwork regardless of the i-thickn'ess of the workg 5 :The upp'er thread yielding position of the take-up iswariedg but therlower'most thread 3, retracting gipositioni offrthe take-up in which the stitch issetdsalvvays the same, so that if a length I of. threadi iszidrawni-from the supplyii'n sufficient:

' is threaded.a,sorew;32'acting asacrankifor'opereratedrby amount; to :rorm a-i stitch with the lockat a uni- *for m depth in: thework accordingitothe thickness 1 of ZthGNVOlk, then: the ::stitch -will .beiset at the propenspointi-lin :the lowermost :position of" the take-up; :This: arrangement permits the take-up toxlfunctionior l two. purposes, namely, toy set' "the stitchand toacause thethread to ;be measuredfoit for; .the succeeding stitch by I the xaction Qf l/the otherstitcheforming devicesimpassing the .needle loopuabout theZshut-tle' when-,theatakeiup. is in" its uppersposition, Ethm obviatingsthe: necessityffor a separatemullroff and?reclucing the friction of 'threadlengaging th'eithreadlmanipulatingidevicesbetweenfthesupply and theworkg; '1 i 1. z i The takeup I2 :is actuated Pins timed relation with. thezmovements'i of the. other stitch-forming devices by ystemsof leversconnected to be opries at its outer end a gear 30011 one sideiofiwhichati'ng ithe take-up1 meclianism.= .The screw- 32- passes loosely through one end of a link 34 pivotg tallyz connected at -"its.z-other fend-Ito: an eirm 3% r tatableiaboufi'ascrew 38;:threaded intoone arni of ga fikedg-br'acketml.We bracket 40 issecured byJanysuitable means to a' fiked shaft 32 mounted in the 'fi'anijef lBZ'a-rid'the otherarmfof the bracket carries a'fulcr um screw l l for a IeVer G SQ The" lever-6 carries' on one arm a 'stud' liifo rm ng' the fulcrumi-for the take upi lZ-whi'ch isin t'hefiforr ri tr lever hav ng take-up pulleyf so at one end and an 'ar'cu'ate slottedportio'n 52 at 'the' other i endpTheother 'arm of thelever'fie is' connected leased from the shuttle.

take-up lever is restrained against movement by arblock 56 sliding in the slotted portion52 and pivoted to'one endjof alever'e'di )The lever 58 is horizontalshaft; 26.x Theshaft car byalink 5G to the pivot between the link 34 and the arm 36. "As the shaft 26 is rotated, the links 34 and 54 move towards and from a position of alinement and thereby cause the lever it to actuate the take-up to retract the thread asit is re- The slotted end of thefulcrumedon a shaft 60 l'oosely'mounted in a frxed part of the frame of the machine, and while n'oivariation occurs in the thickness of the work, the block 56 is held stationary, causing the lever v ,I2.to rock and slide ab out the block 56 at the end .of the. le

i the take-u" The arcuate slot of the portion. 52 of vat ur c will coincide with the center of the shaft tfia bou't which the lever 58 is fulcrumed when the takeup "is in its lowermost thread retracting polever 58 opposite the pivotediblockfifi" is con nected by a link 62 Ytoone arm of a lever pivotedv at 65 .011 the machine'frame. The other arm-of? the lever 64 is connected by a link 66 the sewing head and operated by the movement of the presser-foot; The lever 63 is connected to move with the presser-foot as itapproaches' the surface of the work by a link it connected between the leverttandya lever 72 '(see Fig. 4)

ful'crumed looselyon a'horizontal' shaft- 14, The

shaft M carries the usual spring lfifor resiliently maintaining the presser-foot'in engagement'with the work through an arm JBfiXGd. to the'shaft 14 and connected at its outer end with the presserfoot as described in Patent No. 1,914,936;

-A yielding connection is provided-between the shaft-14 and'the lever 12, so that when the presser T foot -4is raised from thework the'lever 58 for changing. the stroke of :the take-upwillnot be rocked; This connection-comprises an arm 80 fixed to: the shaft '14 and under-lyingthe outer arm of; the lever 12', a'bolt' 82 passing through the-fend of the arm 88 and a'portion' of the-lever 12-,and acompr'ession spring 84 surrounding 'the bolt 82, the arrangement being such that the arm 80 engages the'lever ll'whilethe presserfoot engages thework, but the'presse'r-foot may be raised from the work without operating the lever l2 on; account ofthe yielding action of the 51 11115518451; ;.l i

soarranged that its center of our Toprevent rocking' ofthe lever 58"wh'ile the Worki'i'sreleased from the presser-foot and the feed'pointfi is acting to feed the work, friction means i are brought 'into operation for l'ocking v the lever 5th against movement while the presser- I foot releasesthe. work. For'this'pu'rpose a 'pair ofjdisksBS and 88 looselys'urround the shaft and areiprovided; with inter-engaging friction facingseelli The' d'isk 855 is formed with a bushing extendi'ng'through and acting asa'bearing securedto the lever-58 and the disk 88 is formed withza collar portion-fixed to the frame portion of' the'machine. The disks are thrust into looking engagement with each other by a coiled. spring 92 on a sli'dable' sleeve 94 surrounding a reduced end of the shaft 60 andactingbetween the bearing for the shaft and a collar at ,the end of the tion to the operationof the other stitch-forming devices. j The arm 86is pivotally mounted on a pin98 carried by'the frame. of the machine and islmaintained yieldingly in engagement with the inner endof the shaft .60 by aspring I compressed between a portion of the arm and .a part of the frame of the machine. The free end of the arm96 carries anadjustable set screw I02 for engaging an armI04 operated'by a cam projection I06onthe gear30. The arm I04 is fixed to a short shaft I08 journalled in a bracket III). mounted on the cover of the wax pot I4.

The free end of the armI04 carries a roller. III for engaging the. cam I08 and for shifting, the shaft-60 longitudinally in accordance with the operation of vthe other stitch-forming devices.

3 To, prevent displacement of the lever 58 along the shaft 60 when the pressure of the spring 92 is released, a comparatively weak spring H2 surroundsa reduced portion of the hub of the lever 58 and is compressed between the lever andthe collar on the sleeve 94 so that as the sleeve is moved away from the lever, the lever is maintained; in position by the spring I12 and a slight frictional drag between the disks 8B and 88 prevents erratic movements of the lever 58. The

.; uppermostpositions of the take-up are by this position ofthe take-up I2, and is drawn from the supply by the shuttlein passing through the needle loop. The shuttle requires a fixed length of thread for this operation and acts to draw thread through thewax pot I4 and from the supply It in an amount depending upon the thread used in the previousstitch and the position of the take-up in its upper position. Since this position of the take-up is varied by connections to the presser-foot, the length of thread will the wax pot I4 at I14.. This thread lock combe. measured by the thickness of the work beneath the presser-foot.

Athread lock against which the stitches are set is'provided between the thread supply reel I6 and prises a pair of grippers, one of which is fixed to the'bracket I lfl'andthe other of which is secured to one armof a lever IIB fixed on the shaft I08 to be operated by the cam arm I04. The other arm. of the lever 'IIB carries an adjustable set screw I I8, the lower end of which is formed with an enlargement andis surrounded by a spring I compressed between the enlargement on the set screw and a stud I 22 on the wax pot cover to maintain the thread lock H4 in looking position tsee Fig.7). The thread lock is released by the cam projection I08 when it engages the roller I I I on the arm I04, so that the necessary length of thread for each stitch may be drawn from the supplyreellfi bythe shuttle in passing the locking thread through the needle loop. At this same time the take-upis in its upper thread releasing position and may assume an intermediate position between the limits of its. variation.- "When the work is of maximum thickness the [greatest amount of thread is drawn from the supply and the take-up is in the lowest thread releasing position shown in Fig. 5, and while work ofminimum thickness is being operated upon, or the presser-foot rests directly upon the upper suris released from the locking effect of the friction disks 86 and 88. The machine is brought to rest by releasing the treadle 29, disconnecting the driven shaft 20 from the driving connections as described in Patent No. 1,885,927, above referred to. The release of the treadle 29 also causes the presser-foot to be raised through connections from the treadle, including a link I23, an arm I24 and a'lever I26 on a shaft I28, a retracting hook member I38, a retaining hook member I32, both suspended from the shaft 28 in the sewing head, and a T-shaped arm I34 of the lever I2 loosely supported on the shaft 14. The lever I26 is made fast to the shaft I28, and when the arm I24 loose on the shaft is raised through the release of the foot treadle 23, a projection on the arm engages a portion of the lever I26 and causes the shaft I28 to be rocked in a clockwise direction to a 1 position shown in Fig. l. The inner end of the shaft I28 carries a roll I36 which, during sewing, engages a cam surface on the retaining member I32 and holds both the retracting member I38 and the retaining member I32 out of engagement with the T-shaped arm I34 of the lever I2 substantial 1y as in the construction disclosed in Patent No. 1,885,927. When the shaft I28 is rocked by release of the treadle, the retracting member I which is suspended from an eccentric I38 mounted on the shaft 28 is permitted to engage the T- shaped arm I34 of the lever 12. During the cone tinued rotation of the shaft 28 the retracting member rocks the lever about the shaft I4 and causes the outer end of the lever to engage the arm 80 fast on the shaft I4, thus rocking the shaft. Rocking of the shaft "I4 raises the presser-foot by reason of the arm I8 on the outer end of the shaft connected with the presser-foot and the presser-foot is retained in raisedposition by the retaining member I32, as shown in Fig. 2. The movement of the lever I2 is also transmitted to the take-up actuating mechanism through the connections comprising the link I0, the lever 68, the link 66 and the lever 64 to cause the outer end of the lever 64 to be depressed.

For releasing the pressure of the spring 92 against the friction disks 86 and 88, at the end of a seam, the lever 64 is provided with a stud bolt I40 pivotally connected at its lower end to an intermediate portion of the lever 64 and guided at its upper end by an opening in a plate I42 (see Fig. 5) secured to the adjusting bolt II8 carried by the lever I I6 for operating the thread lock. On the upper end of the bolt I40 is threaded a block I44 secured in place by a lock-nut I46 on the bolt. The block I44 projects laterally from the bolt I40 to overlie the upper end of the bolt II8 carried by the lever II6 for operating the thread look so that when the outer end of the lever 64 is depressed, the block I44 will engage the bolt I I8 andcause the thread lock II4 to bereleased; The shaft I08 carrying-thelever H6 is also rotated when the block I44 moves downwardly, and the cam arm I04is rocked face of the horn, the take-up occupies an extreme against the s'et'screw J02 carried'by the arm 96. This movement causestheshaftfifl :to be shifted longitudinally Joy-the arm 96.to',release the pres! sure. of \r the spring) 92 :fromithe' friction: disks 86 and 88, asipreviously describedsoathat thelever 58 for regulating the stroke -of the take-up is,

free .to move: Since the iconnectionsxoperated as the machine is brought tolrest' do not include:

I the-spring '84; thislreleasing'.actionis a positive one'and the engagement 1 of ,theiriction' disks BB j and 88 do I not vpresentssufiicient drag to' prevent the movement of.-the lever 58. 7

When the machine is restarted by depressing: the treadle '29,;the connections fromi. the treadle operate towithdraw" the iretracting'rmember I30 and the retaining member. i32. from engagement withtheT-shapediarm I34 of the lever 12, which permits the presser-footto engage the .work and causes the"1ever. 58 to move ,intosuch position: as will produce theproper movement of the takeup to cause-thread to be measured for the initial stitch. vSubsequently, the.. connections between a the presser-foot and the take-upactuating-mechanism operate in the same way-as previously 'indicated'. v a I r v. The nature and scope of the invention'having been indicated and an' embodiment of the invention-having-been specifically described, what is;

claimedis: I i V h LA sewing machine having, in combination,' stitch-forming devices including a hook needle,

a loop taker and a take up for drawing a loop of thread-from the loop taker, and means acting as the-work operated upon varies in thickness to the quantity of thread "withheld'by the take-up while the "thread" is being; drawn 3 from the; supply by others oithe stitch forining devices;'-

2. A 'sewing'machinehaving, in combination;

stitch-forming devices-including a hook needle, a loop taker, and' a-take-up'fior drawing a loop of thread-from the looptaker,y and means acting as the work operated upon varies in thickness to vary from one stitchforming cycle'to the next,

the position "ofthje';take-11pm which the mini mum quantity or thread is withheld fr m the other s'titchfforming devices he respective a les-i o i, 3, Asewingmachine having, i combination, stitch-forming'devices including ahook ne'edlei a loop taker, and a take-up 'for drawing a loop ofthread from t 10010 taker towards the work, and means acting during operation o f'the'machine ion varying'the movement of the take-up relatively tothat of thejloop taker to cause the quantity of thread held aside therebvtofchange' between successive Pycles' of operation oi ,lthe ma ine 1' j if; l H v f4. A sewing] machine havin in combination, s titch-forming devices including ahookfneedle, a loop'take'r; and a take-uprbr umwisg "a loop "of threadirom the loop takerutowards lthejwork, and means acting during operation offthe mag chine. .to, vary the movement of i the. take-up rel a v yimh brine-1m aka: a h fw' k n;

a e -na nie m1 l -fl n 1 5. 1A lock'stitch sewing machine having in combination, stitch-forming devices including a ii fi 'e hr a 514 51 anoma e 'a'i k 1 up q aflrew n a, loop Q ihre dirom the-. 091? takertowards the work a thread lock acting duri e; are awin st r e o th k 'r n' t 'ia s -ihes itchi he et-an me ns forcausin the. .1 91 ake f o-d aw. t re f EOlIMQlIQ PD M W01"k;1s or a v i 1,174; A- 'lockstitch :sewing machine having,

through; the thread lrlocls varying inuaniountsas. the work operated upon varies in thickness: 16.iAqilockstitcha,sewing machine having," in combination,stitcheforming :devices including a hook needle, a 'work support? anda. .presserfoot,

a looprztaker, and a: takeeupcompri'sing a single threadengaging member; ..mechanism for actu-' ating theitake-up-ito draw aslooplof threadifrom the. loop. taker towards the workiiand connections a between the 1 presserfoot and thetake-up I actuatingzimechanism 'for'varying %the movement 'of the take-up as theaposition of the presserl'f foot is varied by engagingidifierent thicknesses :of the m1 combination, stitch 1 forming devices: including ahook needle, a'work supporting horn and a press er foot ra l0op1itaker,a take-up and means for releasing-the presser foot from thework and-for feeding the: work :while the presser foot is released,; mechanism for actuating' the take-up "to draw; a I loop of thread from the loop taker towards. the work,-'connections between the presser foot and the take-up actuating'mechanism' for varying the thread drawing strokeof the take'-" up as the position of-i the 'presser foot is-varied by: different thicknesses of the rwork,:-. and means for "rendering the connectionsto the take-up actuating imechanism inoperative. to vary-the thread drawing stroke of the take-up while the presserioot is released from the Work.

8:: A lockstitch sewing machine having, in combinatich,stitch-forming devices including a hook needle, a Work support and'a presser-foot, a loop taker, a take-up and means for releasingthe presser foot fromi'the' work and for feeding the work-while the press'er foot is released, mechanism for actuating the tak e-upto draw a loop of :thread from the loop takertowards the work,

yieldingconnections between the presser foot and t the take-up actuating mechanism for varying'the thread drawing stroke of the take-up as the posi-,

tion of the presser foot isvaried by engaging dif ferent thicknesses 'of the work, and means for locking the connections to the take-up actuatingmechanism against movement while the presser foot is released from the'work; w

-- 9. A lockstitch'sewingmachine having, in com-- bination, stitch-forming devices including a hook needle, a -worktsupport and a presser-fo'ot, a loop taker, a: take-up, and means for" releasing the presser-foot vfrom thewo-rk'and for feeding-the work while the presser-foot is released, mechanismiforactuatingthe take-upto draw a loop of thread from'theiloop taker-towards the work, connections between the presser-f-oot and the lta'ke up actuatinga mechanism: for varying the thread-drawing strokeof thetake-up as the.posi-. tion of the presserfoot is varied by engaging different thicknesses of the'work; means for rendering the.;connections to. the take-up actuating mechanism inoperative While-the presser footris released. from: the :workrandi for rendering the saidconnections operativewhen the machine is brought to restvrith thepresser-ioot disengaged from the work. a '5 I 1, a,

10. 'A lockstitch sewing machine having; .in combination, stitch-forming devices including a hook needles-a loop taker, and a' take-up comprising-a single thread engaging member for drawing aloop-of thread from the loop 'takerto--,

' wards the, work and 'ai'thread lockzacting during the threaddrawing stroke'zof the takeup .to cause the stitch ;to be set andto maintain a griplon the thread vuntil thetake ,-.up reaches an extreme 'position in its movement, and thereafter to permit a length of thread for the succeeding stitch to be drawn from the supply by the other stitch-forming devices.

11. A. lockstitch sewing machine having, in combination, stitch-forming devices including a hook needle, a loop taker for passing a loop of needle thread about the locking thread, and a take-up, said take-up being movable to two extreme positions, and mechanism for operating the take-up to set the stitch as it reaches one extreme position and to cause sufiicient needle thread for the succeeding stitch to be drawn from the supply by the loop taker in passing the loop of thread about the locking thread while the take-up is in its other extreme position.

12. A lockstitch sewing machine having, in

combination, stitch-forming devices including a hook needle, a thread look, a loop taker for passing a loop of needle thread about the locking thread, and a take-up, said take-up being movable to two extreme positions, and mechanism for operating the take-up to set the stitch as it reaches one extreme position while the thread lock grips the thread and to cause sufiicient needle thread for the succeeding stitch to be drawn from the supply by the loop taker in passing the loop of needle thread about the locking thread while the take-up is in its other extreme position.

13. A lockstitch sewing machine having, in

v combination, stitch-forming devices including a shoe supporting horn arranged to extend within the shoe, a straight hook needle, a loop taker for passing a loop of needle thread about the locking thread, and a take-up, said take-up being movable to two extreme positions, and mechanism for operating the take-up to set the stitch as it reaches one extreme position in its movement and to cause sufficient needle thread for the succeeding stitch to be drawn by the loop taker in passing the loop of needle thread about the locking thread While the take-up is in its other extreme position.

14. A lockstitch sewing machine having, in combination, stitch-forming devices including a shoe supporting horn arranged to extend within the shoe, a presser-foot, a straight hook needle, a loop taker for passing a loop of needle thread about the end of the locking thread, and a takeup movable to two extreme positions, mechanism for operating the take-up to set the stitch as it reaches one extreme position in its movement and to cause sufiicient needle thread to bedrawn by the loop taker in passing the needle loop about the locking thread while the take-up is in its other extreme position, and connections between the take-up actuating mechanism and the presser-foot to cause the amount of thread drawn oif by the loop taker to vary as the position of the presser foot is varied by engaging different thicknesses of the shoe.

FRED ASHWORTI-I.

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