US2372105A - Sewing machine - Google Patents

Description

March 20,1945. R. NAFTALI ETAL 2,372,105

SEWING MACHINE Originai Filed July 19, 1935 5 Sheets-Sheet l INVENTOR RUDOLF- NRFTRLJ VALENHNE NRFTALI BY HENRY N F-mu AT ORNEY Maych 20, 1945.' R NAFTAU ETAL I 2,372,105

SEWING MACHINE Original Filed'July 19, 1935 5 Sheets-Sheet 2 INVENTOR Ruoow NAFTAL\- VALENHNE NAFTAU BY HENR NRF MA I ATTORNE March 20, 1945. R. NAFTALI ET AL. I 2,372,105

SEWING MACHINE Original Filed July 19, 1935 1 5 Sheets-Sheet 3 RUDOLF NAFTALI VALENHNE NAFTALI BY HENRY NAFTA ATTORQIEY March 20, 1945. NAFTAL] ETAL 2,372,105

v SEWINGMACHINE;

Original Filed July 19, 1935' 5 Sheets-Sheet 5 1 "O Wig-16: INVENTOR VRLENTINE NRFTAU A TQRNEY y from pulley 32, said collar being adapted to rotate freely on shaft 33. Mounted on said collar for rotation therewith is a gear 35, cam 31 and cam 33. By this construction it is seen that cams 31 and 38, and gear 36 are integrally connected to move as a unit when pulley 32 is driven by the belt 3i. Said cams 3'! and 38, as well as gear 36, are fixedly mounted on collar 35, which is designed to rotate freely about shaft 33. is provided with an annular grove in which rollers 39' are guided, said rollers being mounted on shafts ill fixed to plates 4|. It is seen from the above construction that plates 4] will be caused to oscillate with a predetermined regularity in accordance with the path of the annular groove in cam 38. This predetermined degree of oscillation of plates 4| may be made to be of the same amount as desired for the oscillation of, upper needle bar 59 and lower needle bar 5! to alternately clutch the double pointed needle 52 after it has pierced the material to be stitched. The oscillatory motion of plates 4! may be transmitted therefrom to needle bars and 5| by means such as rocker arms 53 and 54 pivoted to the casing at 55 and 56, respectively. Rocker arm 53 is connected to needle bar 50 by means of a link link 51 and to plates 4| bymeans of a link 58, while rocker arm 54 may be connected to lower needle bar 5| by means of a link 59, and to lates 4! by means of a link 60.

During the operation of-our apparatus, as fully described in our Patent No. 1,931,447, it was found that much time was lost by the operator in the mounted on threader 65 and adapted to ride on lower jaw 68 to force said jaw 68 downwardly against the action of spring 1 I. As the threader 85 is pulled back to be withdrawn from the eye of the needle, hook 66 carries one end of the thread through the eye of the needle to thread the same and thence between the opened jaws 51 and 68. At the same time cam 69 allows lower jaw 68 to resume its normally closed position to grip the thread T between the teeth of the upper and lower jaws 61 and 68 to hold said thread in a fixed position. One end of thread T is thus threading of the needle and in securing one end of the thread in a fixed position until the stitching of the tie has been completed, at which time the thread had to be released by some means such as cutting with aknife or breaking.

We have, therefore, devised a novel mechanism by means of which the needle may be quickly threaded, after-which one end of the thread is automatically grasped and'held until the stitching of the tie has been completed, at which time the held thread is then automatically released. The mechanism by which we accomplish this may be described as follows: i

A threader 65 (see Figure 3) having a threading hook 66 at one end and a handle I51 at the other end, is pivotally mounted on a shaft I58 in link 51 fixed to upper rocker arm 53. By this construction it is seen. that hook 66, which is adapted to pierce the'eye of the needle 52 to thread it, will always be in proper position to I pierce the eye of the needle 52 when said needle over the hook, is ready to be threaded in the eye of the needle.

By referring to Figures 3 and 15, it will be noted that a pair of jaws 61 and 68 of a graspnig device 10, supported on the machine casing, are shown held in effective Or closed position by the action of a spring 1 I, whereas in Figure 16 it is seen that when the threader hook 66 has been inserted through the eye of the needle, the jaws 5! and 68 of the grasping device 10 have been forced open by meansof a cam 69 rotatably held fixed for a predetermined time, such as when the tie has been completely stitched, when it is automatically released. Grasping device 10 is adjustably mounted on a plate fixed by screws 8! to carriage l3, and held in any desired adjusted position by means of a bolt slidable in an elongated slot 82 in plate 80, and having its head 84 slidable in a complimentary slot formed in carriage 13. The bolt may be secured in adjusted position by means of a nut 10a (Figures 14 to 16). We have provided the following means for automatically releasing the held thread at such predetermined time. A vertical plate 12 is mounted on the machine frame at one side of an intermittently traveling work carriage 13 (see Figure 14). The mechanism by which this work carriage is moved will become apparent as the description proceeds. Attached to plate 12 is a track 14 inclined with respect to the horizontal and suitably positioned and adapted to have a roller 15 ride thereon, said roller 15 being rotatably mounted on the extended end of lower jaw 68 (see Figure 16) Lower jaw 68 is made to pivot about an axis 76. When the work carriage 73 travels in the direction of the arrow (Figure '7) for a predetermined distance, roller 15 will ride on inclined track 14 to cause lower jaw 68 of the grasping device 10 to automatically release the thread T.

In stitching machines of the type described, wherein a looper is employed and where the loose end of the thread is pulled through the work after the completion of each stitch, it is particularly desirable to provide means to prevent the two strands of the thread cooperating with the needle and the work from becoming intertwined or entangled. Should the thread become entangled, the looper or the thread puller would tend to engage both strands of thread, and since one end of the thread is held fixed, it would be broken thus causing delay and inefflciency. To obviate this disadvantage we have devised novel thread holding mechanisms designed to constantly maintain the thread in position to prevent tangling. We will first describe the operation of our thread holding mechanism as applied to the needle, when said needle is connected to the upper needle bar 50. Then the operation of the mechanism which we employ to hold the thread when the needle is connected to the lower needle bar 5| will be described.

In Figures 7 and 8 of the drawings there is disclosed upper needle bar 50 slidably operating in the frame C, said frame having attached thereto a bracket 80a. An arm 8|a is pivoted at one end to bracket 80a at a point 82a. Arm 8la may be held pressed into engagement with needle 52 by suitable means such as an adjustable spring 83. A stop 84a, fastened to the frame of the machine, is provided to limit the pressure of arm 8| (1 against the needle 52 to prevent breaking of the needle. On the opposite side of the needle 52 from that of arm am we provide another arm 86.

ite be acted uponby a speciaiiy designed *looper -*Anotherthread holding-mechanism is al'soiproyided to hold the strands of the' thread when the "needle is connected to the flower "needle bar 5 I Referring-to" F-igure 3', there' is disclosed a cam -m'ember9 I fixedfto '-rocker"arrn '54'. Cam n'ieniber WI is provided-With a Slotted portion "92. link "is pivotal-1y connected to thmadhine easing at 8. fpo'int fllsaid link-'93 having 'ffiiied' thereto afiain 95 "adapted to engage the slot92 to'cause l'ihk l 'to traveHnan oscillatorypath about pivot 9'4-Wheneyer-rocker arm 54 is moved. A forked 1 member -96 is "pivotallyattached to link 93 at *0! at-one end, and "toe lever '98 at 'a' point'99. Lever *Qfl is pivotedtd'th'e' machine casting at "l00 ,as *shoWn-infletafl *in Figure "10. Forked Inember 96 has extension arin'members which" arezadaptedfto -straddle and press against the need1e"52 at opp'osite side' thereof to' maintain the thread in properali-gnmentto prevent entanglement. Cam *mem-ber -l is'so designed as tomaintain the lower "thread holding mechanism; asjust described, in *effe'ctive *positiofr until such time as "thethread is acted upon-by a"specia11 y designed thread puller; similar to that shown and described in our J P'a'tenii{N01 1,931344'7; and which will he discussed "more fully asthe'"descriptiodproceeds. p To further-increase the efficiency of operation of our stitching-machine;*we have devised a novel mechariism which we call aioo'p'er; the operation "or 'wh-ichwillnow be explained} Referring first to Figure '7 of 'thedrawings, there isjdisc'los'ed a *looper I '05; one end-dfwhich is piyotallymounted onthe' machine "casingat a "point'such as I06. Uournaied in said machine "casing is a shaftJOT 6sec also Figure 51') having mounted thereon at one end a lever I08. said lever I08 is connected to -1ooperl05 *by means or a link I09, one end of "which is pivotaliy fastened to looper I05 at a point such as I 'I 0, the other end being 'pivotally connected toieve'r I08 at III. 'Thus'itc'afifbe "seen that 'when shaft HIT is; "rotated,'1oo'per I05 'wili' he caused to" oscillate about "pivot I06. "I'he degree and r'e'gu larity of this oscillation may be governed by means of a lever H5 mounted on iits'haft w'l and prov'idedwith a cam follower, such The contour'of cam 'al m'ay'be such as to cause loeper =I' 05,"-through the linkage system just] described; toesci llate I about its; pivot! 00 at predetem'lined'dnterv'als "hem"- an inoperative position snnwn in dotted lms-in Fi ure 7; to'aeveneed op 'iveposi tioh' s eh essnownin full lines' in Figures 11' and 13, an'ci engage the thread after upon the downwardtravel ofthe uppernedle har. "Loo'per 105; which may use any" suitable "hook rneans for engaging the thread, such a's a "spooH-ike projection I I6 mounted on apin' 105a earne in arm I05, travels to the left from' its -inoperative position (as viewedin Figure "1-).

'Spoel like projection "I 18 ("see Figure '3) "has-"assoei'ated therewith aroller use rotatably mount- "ed onpin I-OBG/ carried by' the looper arm. "In'this way the loope'r en gages the thread; forms a loop -(as *shewn in Figures arena" 13) andexerts suf- ""fldint pulling frce 0n the 16086 'eh'd- Of the thread to pull a smn-rpenmntmreor back through the T work' and thereby-provide slack therein. When Tooper I 05 occupies th'position "shown in Figures 20 ll and liii andthread puller -I20 engages -the thread beneath the work-and adjacent'the lower needle-bar; ro'ller -II6a"act's as a guideio'rthe floos'e end of the threadasit is pulled-through-the *werk by the threa'd puller I20 and deposited ahout drum I21. From the abovefie'scriptionof t-he operazition-of the looper; it 'is' apparent that the loose end oft-he thread T--is prevented from becoming entanglewand broken when the needle 52' is-sh-ifted rrem -the' upper needle bar; as in Figure 7, to be clutched by t-he lower hee'dl'e'bm as shown in Figure IO. n rtnermerewe thread will he' properly guidedby' roller "I I 6a with '-''a "substantial -elimi'hation of friction on the thread as it is pulled'hy the puller-120. Als duetetheprovision of slack, each stitch formed' wi-ll be properly tensionedinthematerial being sewed. This last "feature 'is also enhanced by the fact "that cam 31 is so designed that a slig-ht rearward 'o'r're. Yttirn movement is imparted to "iooper I05"a's the 'needle moves through the work on its downward fin'ov'e'ment. The mechanism for operating the --'1ooper I05, justdescribed, is designed toact in "cooperative -re1ation"with the thread holding means *hereinabovedescribed in connection with the upper'needle bar-50.

' The mech'anism which we employ in our improved apparatus to engage thefloop's as they are "formed from the thread institching andtodraw or pull out the free end portion of the thread atter each stitchmay 'be similar to that shown and "described in our *Patent'No. 1,931,447, here-- "inbefore mentioned; The Operation of the above {described mechanism will'be clearly understood from 'a study of Figures 3 and? of the drawings twin-which itis 'seen that gear 36 ismountedfor rotation withipulley '32, and that when said gear -36 isr'otated it causes a thread puller I20 to be I "carried in a circular "path around the periphery 0 "of aflstatio'nary grooved drum I2I, by means of a ed'chain of gears: "(Figure 3), I22, I23 and I24. The following mechanism may be employed to cause thread p1111erl'20 to travel in its circular path? I 1 p Gear "I2 4 is 'so'mounted that it isin eccentricr'eesjati'onto the'axi's"ofthegrooved drum I 21. Fixed fto gear I24'for rotation'therewith isan annular "plate 124'. The thread puller I20 is fixed to the outer end' of a carrier arm I25, said carrier'jarm "being fiivoted at its'innef'end to the drum I2I at a point I26 coincident with the center of said idrum I21 Carrier arm I25 is providedfwitha "longitudinal slot I21'into' which a blo'ck'l28, fixed to the outer edge of annular disc I24, is "adapted to slide. Thus it"isf si enthat when .g''ar I24 is i-. "ietstea'jtne threadpuller "I20 is caused to travel around drum I2I. The mechanism for operating the thread puller, as just described, is designed to act in cooperative relation with the thread holding means hereinbefore described in connection with the lower needle bar 5 I.

The function of the stationary circular grooved drum I2I is similar to that shown and described inour Patent No. 1,931,447. Briefly stated, it is to support the loose portion of the thread on the periphery of said drum I2I after the said thread has been pulled out from the fabric by the thread puller I20. Figures 11 and 13 clearly illustrate two steps in this action. Drum I2I may be provided with grooves I as shown in Figure 12, to prevent, entanglement of adjacent strands of the thread while they rest on said drum I2 I. To further safeguard against the possible entanglement of the loose portion of the thread while it is being guided onto drum I2I and into grooves I29, ,we

have devised a novel thread holding means which may comprise a plurality of brushes I held in engagement with grooves I29 of the drum |2I eificient mechanism than heretofore employed for intermittently advancing the platform carrying the fabric to be stitched. I

By referring to the drawings, the operation of the above mentioned mechanism will be clearly understood. In Figure 7, we have disclosed a portion of the work carriage or the traveling platform I3 adapted to travel along any suitable guide means or tracks, such as shown and described in our Patent No. 1,931,447. On the underside of said platform I3 there is provided a toothed rack I 35. On a shaft I3'I fixed to the machine casing C we mount a gear I36 designed to mesh with said rack I35. The means by which gear I36 may be intermittently rotated to intermittently advance the platform I3 may be described as follows:

On the shaft I3'I we also mount a notched wheel 2,872,106 scribed. Referring first to Figure 5, we have shown an enlarged view in section of the mechanism of the upper needle bar to which is screwed at its lower end a tapered chuck 90.

Within the hollowed interior of chuck 90 we provide three balls B (see Figure 6) arranged so as to permit needle 52 to be inserted between them and held thereby. When the balls B are pressed downwardly, the tapered portion of chuck 90 forces them together to grip the needle 52. This downward pressure is applied by means of a spring I50 pressing against a shank I5I which in turn presses on the balls B. The upper end of said spring I50 abuts against a member I52 screwed into the top portion of needle bar 50.

The upper end of shank I5I extends through member I52 and is fixed to a stop I53, the lower end of which is provided with a hollow portion adapted to allow needle bar 50 to slide therein.

"I55 (Figures 7 and 8) pivot-ally mounted in a frame I56 fixed to the machine casing C. When I38 having a series of spaced notches I40 arshaft I31'and gear I36 mounted thereon to advance platform 13 apredetermined distance in H the direction shown by the arrow. Gear I22 is mounted on the same shaft as gear I22 and rotatestherewith. Gear I22 is driven by gear 36 which in turn is fixed to the pulley 32 for rotation therewith. The mechanism just described is so designed. as to cause platform I3 to travel a predetermined amount after each stitch.

It is well known by those familiar with the art that the needle employed in machines of the type described must be occasionally changed for various reasons. It is desirable, therefore, that this v be done as quickly as possible. To facilitate the quick removal and replacement of the needle, we

. have devised a mechanism which will now be dehandle I55 is pressed downwardly, the lower forked end of said handle will engage the underside of stop I53 to raise the same and thereby release needle 52 in the manner just described.

It has been found in the course of the operation of stitching machines of the. character described, where the upper and lower needle bars are in alignment, that occasionally the thread would be found tooverlie the hole of the lower chuck so that when the needle travels downwardly to be grasped by the lower chuck it is apt to pierce the thread which interrupt its path, to break said thread. This obviously causes a delay inasmuch as it then becomes necessary for the operator to stop the machine and rethread the needle and start all over again. We have devised a novel means for overcoming this disadvantage which consists in positioning the needle hole in the lower needle chuck 90' to one side of the pointed portion thereof. By this construction it is seen that the thread T is not able to rest over the needle hole in lower chuck 90', but will tend to slide down to either side due to the pointed construction as well as the positioning of the needle hole.

When operating machines of the character described by power means, such as a motor, it has been found desirable at times for certain reasons,

such as making trial stitches, to operate the machine by hand. The means by which we accomplish this in connection with our apparatus may be described as follows:

Positioned within the central portion of pulley 32 is a clutch mechanism I60 shown in detail in Figure 4. This mechanism operates on a principle similar to that used in free wheeling devices. A disc member I63, of the clutch I 60, is rigidly at tached to a collar IBI which idles on shaft 33. A

' plurality of spaced notched portions I62 are cut out of the circumference of disc I63. Into these notches are fitted rollers I64. It will be noted that disc I63 is of lesser diameter than the interio-r opening in pulley 32, thus permitting said disc I63 to rotate freely within the pulley 32.

Fastened to the disc portion I63 of the clutch I60 at one end is a hand wheel 39, as shown in Figure 3, adapted to rotate with said disc I63.

awaits:

ltwi lebe seenafrom; t1 .le -.a b0ve; described con totienhthat w enever t eq a dtwhe 39 i-s rota ed in be held in notchedportionsi62 and disc: i631 will. be perm ,ted to rotate treely without reflecting thel rotation of pulley-32.; However, when the llfll'a-vwheeldw is rotated-in a counterclockwise direction, opposite; to thatshown-by the arrows in L-Eigures'Ba-and 4,; rollers: H34 will-.- then. be freed 'o kwi e di cti n; a in ica d by Y thqfilimws-lrt Eignres henddthe rol-lersslfil will from thenotched portions! 6-2: toengageetheinner suriafie oi pulievtizto; lock disc i 63,to said pulley for rotation therewith Thus it isseen thatwhem.

even-it'isxdesiredto operate the,stitching machine v by hand it is merely necessary to turn the hand wheel in a direction opposite to that shown by the ow "i Ei ht en-a ds andm so do n -r. the

,machinetwill operate-similarlv to thatot theop erationwhen powertmean-s is used '1 Shoulditj-be desiredto operategour apparatus" to a allaxwe hevepr v d a ut m t switching; mechanismedapted to. close acircuit to startlt e motorwwhena;lever-mechanism isitrip-ped anddc: cause said circuit to be broken to stop I the, apparatus when theworkplatform has itraveledl apredetermineddistance In- E! M 1- 8 weheve own a wirin dia illustrating onejmeans for accomplishing this rei sult; When lever; llht is turned in the ldirection or the j arrow B, a catch mechanism I'll is tripped toclose the; contact'spl 'll ofthe 1switch-S;by meansof asprinaB in order tocomplete a circuit from a sourc of current;su-pplwthrough;the motor M whichqris; ener ized-4'00- cause platform 13: to travel inthe direction of: arrow ;A;; Fastened to platiorm an r v h wi h is a pr ie t eue- 13' t adapted-tostriheagain-st! a-projeeting portion S1 of-switchS-r Lug, l l3 vmay; be positioned at a pre-- determined: distance from theprejectingv portion, a

of switch 3', suclr for v example as is necessary I12 are opened against the action of the spring-R tobreak the circ t and stop motor M. The lever Hfl may; then bemade to re-engage catch Hi to for-the: completeystitch-ing of atie. When lugs I13" strikesprojectingj portionot switch; Sj, contacts hold contacts l-1-2.; open until itis; desiredto 013-.

crate: the: machinei-tostitchanother ;tie.- 1 thusbe seen that there is provided; a

device e th o tions; nracticat use:

Asv various possible" embodiments-l might be a e of titheb ve ve tionrfendza o s.

- changes, might be made in the embodiment-set 1 thvi 3 e: und rte dt h t'al z matter h n. se s tha r sh wn th accom a y n rawmes is b interp eted, a l st a ive a d. 9

in a l'imiting,sense-v t tist im d is r 1- I stami a-machine, th co binatio f needle having a thread associated; therewith a need e ba .=rc h mtine i said ee le. a sta -.1

iomrr surnortltbr .sa dtn edl dap e permit vertical movement of said needle. bar

e n mnera ineiw thl pposite i f said needle f naintainine said, thread. in prope relationshipwithsaid needle to prevent entangleit f aid h ea ls d ast named ans c prising J a, pair of'm'embers normally in contact with; opposite; sides of said. needle, means sup which: the-several obj ects; of this. in-, ventionare achievedand-whichds well adapted to tfective use 7 I v 5. In a sewing machine, the combination of ,a

needle having -,a thread. associated therewith a needle lbar cooperating with said needle, a star tionary support for said needle baradapted to permit vertical. movement of said needle bar, a

iloopermember for forming said thread into a loop, means ,for -maintaining said thread in proper relationship with said needle, to prevent machine, the combination of a threadassociated therewith, a

needle'bar,cooperating with, saidneedle, a, stationary support for said need1e ,ba-r adapted to permit vertical. movement means for maintaining said,thread in proper 1'8 latipnship with said needle to prevent entanglement of said thread, saidlast named meanscomprising opposed. members mounted, on said sta- M DIIOrt, means.to imovines idmembe i towards. eachuQther: to en a eflopposite sides of saidneedle, and means coactingl with said mem here for movingtsaid members out of engage-v ment with the oppositesidesof said needle at predetermined. intervals. ,to free. said thread f or. effective user t 4. In a sewing machine, the combination of alternately operating needle bars, a needle having a thread associated. therewith, means I to alter:

nately connect ,the needle with, each, needle bar,

stationary supports .for said needle bars adapted to permit vertical, movement of said needle bars,

means associated with-each of said needle bars formaintaining saidtlireadin roper alignment withsaid needletoprevent entanglement of said thread, said last namednieans, being mounted on saidstationarvsupports andvadapted to engage opposite sides-lof said needle, and means whereby I saidthread maintaining means is caused to dis engagethe oppcsitesides not said needle .at predetermined intervals ;tofree said thread fs ri efneedlehaving a thread. associated UhQEGWith a,

need-lebar cooperating with said needle, a stationa-ry support for said needle bar adaptedto permit vertical movement of said needle bar, and means cooperating with oppositesides of said needle-for maintaining: said thread in proper relationship withsaid needle to prevent entanglementof said thread, 1 said i last ,namedmeanS comprising a pair of opposed members pivctally.

mounted on saidstationary-support and movable in opposite directionsto and from each other, intoand out-of engagementwith said needle 7 6. In a sewing machine, the combination of a needle-adapted to receive ,a thread, a needle bar,

cooperating with said needle, a stationary support for'said needl bar adapted to permit ver tical movement .,of saidvneedle bar, means for aintai n ai th ead in Pr p r on h with said needle to prevent entanglement of said thread, said, last .namedimeans comprising Q1)- posedmembers movably mounted on said stationarylsupport, means ionmovingsaid members toporting each of" said members for independent movement to'and from each 7 other; and means i or moving said members in: opposite directions away m sa dne dle v 2'. In a sewing machine; thecombination of a wards each other to engage opposite sides of said needle, and means whereby said members are caused to disengage the opposite: sides of said needle at predetermined intervals to free said thread for effective use;

' '7; In asewing' machine, thecombination with aneedle bar and a needle having a thread ass0-' ,of said needle ba d.

ciated therewith, a work table, a support mounting said needle for movement to and from said table, mechanism including oppositely movable fingers located above said table coacting with opposite sides of said needle for maintaining said thread in proper alignment relative to said needle to prevent entanglement of said thread, and means operative in timed relation to the movement of said bar for eiIecting the movement of said mechanism into and out of engagement with said needle above said table.

8. In a sewing machine having a work supporting table, mechanism for projecting a needle and a thread having a loose and a fixed end back and forth through work to be sewed and forming loops in said thread alternately above and below said table, a looper located above said table, mechanism for moving said looper into engagement with a loop of thread above said table to pull thread through said work, said mechanism including means for interrupting the travel of said looper while holding said thread engaged thereby away from said work and said needle, a thread puller mounted beneath said table, and

mechanism operative after said looper has en gaged a loop of thread above said table for moving said puller into engagement with a loop of said thread away from said work, and means for moving said puller into engagement with each alternate loop formed adjacent said first-named l bar to pull said loose end of said thread through said work while said thread is held by said member.

12. In a sewing machine, the combination with a needle and alternately operating upper and lower needle bars, of a support for said needle bars, means to alternately connect said needle to each needle bar for projecting a thread having thread formed beneath said table to pull the entire loose end of said looper supported thread over said looper and through said work.

9. In a sewing machine, the combination with a needle and an upper and a lower needle bar for projecting a needle with a thread having a loose and a fixed end back and forth through material to be sewed, and means for moving said upper bar towards said material to form a loop in said thread and for moving said lower bar upwardly towards said material to form a loop in said thread below said table on alternate movements of said bars, of a looper device mounted above said table, mechanism for moving said device from an inoperative position into engagement with said loop of thread formed above said table to pull a portion of said thread through said work and support it thereabove, said mechanism including means for interrupting the travel of said looper while holding said thread, a threadpuller mounted below said support, means operative after the engagement of said first-named loop of thread by said looper device and while said thread is supported thereby for moving saidthread puller to engage said second loop of thread beneath said support to pull said loose end of said thread over said looper device and through said work.

10. In a sewing machine having a needle and means for projecting said needle and a thread with a loose and a fixed end back and forth through work to be sewed, a material support, a revolving thread puller located beneath said support, a looper located above said support and arranged to pull a portion of said thread through said work, mechanism for moving said looperto engage and support a portion of said thread away from said needle, including means for interrupting the travel of said looper whiiei'said thread is supported thereby, and separate means operative independently of said looper operating mechanism for moving said puller to pull said loose end of said thread from said looper and through said work.

11. In a sewing machine, the combination with a pair of needle bars and means for moving said bars, and projecting a needle with a thread hava fixed and a loose end back and forth through work to be sewed, means timed with said alternately operating needle connecting means and cooperating with said upper needle bar for forming said thread into a loop, said last-named means comprising a looper device, mechanism for moving said'device past said upper bar from an inoperative position at one side of said upper bar into engagement with said looped thread to pull a portion only through said work and displace said thread relative to said needle, said mechanism including means for supporting said thread away from said work, and a thread puller cooperating with said device, driving means for operating said pullerior pulling the loose end of said thread through said work while said thread is supported by said device, and means forming a part of said mechanism operative at the conclusion of the operation of said puller driving means for return;

ing said device in a different direction past said upper bar to said inoperative position after the operation of said puller.

13. In a sewing machine, the combination with a needle, of a needle bar cooperat ng with said needle, a support for said bar constructed and arranged to move said needle and a thread having a fixed and a loose end back and forth through material to be sewed, a material supporting surface, means for movin said bar relative to said surface to form loops in said thread, a looper device mounted for movement to and from said bar, and mechanism for moving said device from an inactive position adjacent one side of said bar intoengagement with each loop as formed to pull a portion only of said thread back through said work and displace said thread away from the path of travel of said needle, said mechanism including mean for interrupting the movement of said device at the other side of said bar for supporting said thread away fro-m said work during stitch formation, and meansfor returning said device to said inactive position for the formation of the next stitch.

14. In a sewing machine, the combination with a needle and an upper and a lower needle bar for projecting the needle and a thread having a fixed and a loose end back and forth through work to be sewed, means for moving said upper bar and needle downward to form loopsin a thread carried by said needle alternately on opposite sides of said work, a looper device located adjacent said upper needle bar, mechanism for moving said device into engagement with each loop formed adaa'z'aioa jacent said upper bar to displace thread away from said needle and support the same away from said work, said mechanism including means for interrupting the movement of'said device while said thread is supported away from said work, a thread puller positioned adjacent said lower bar, and means operative while said device is supporting said thread for moving said puller to pull said loose end of said thread from said looper and through said work.

15. In a sewing machine, the combination with a needle and a pair of opposed needle bars arranged in opposition one to the other for projecting said needle and a thread back and forth through material to be sewed, of means for moving on ofsaid bar downward to'form a loop in said thread proximate said material, opposed, separately movable means mounted adjacent opposite sides of said bar and cooperating with said needle to prevent said thread from crossing its path, a looper member, mean mounting said member for movement back and forth along the same path past said bar, means for operating said member in conjunction with said. opposed separately movable means, mechanism for movin said member from an inoperative positionto engage a part of said loop away from said needle to provide slack in said thread and support the same in forming each stitch, said mechanism including means for interlrupting the movement of said member for a part of each cycle, and means for returning said memher to said inoperative position- 16. In a sewing machine, the combination with needle and coacting with said bar to prevent said thread from crossing its path, a-looper member,

meansmounting said member adjacent said bar,

mechanism operating in conjunction with said lastnamed means for moving said member into engagement with a part of said loop to displace a-portion 01' said thread away from said needle to provide slack in said thread, said mechanism including means for interrupting the movement of said member to support said thread away from said work during each complete movement of said member, and means operating in timed relation to the movement'of said bars for pulling said a needle and a pair of opposed needle bars arloose end 'back and forth through material to be sewed, of means for moving one of said bars downward to form a loop in said thread proximate said material, means cooperating with said member is interrupted.

17. In a sewing machine, the combination with a needle, and an upper and a lower needle bar coacting with said needle, of supports for said bars constructed and arranged to move said needle and a thread having a fixed and a loose end back and forth through material to be sewed, means for moving said upper bar downward with said needle to form a loop in said thread adjacent said material, a single looper member, mechanism for moving said looper member back and forth relative to said upper bar along an arcuate path less than to engage and pull a portion only of said looped thread and provide slack therein, said mechanism including means for interrupting the movement of said member during a portion of its travel, and a thread puller positioned for coaction with said lower bar while the movement of said member is interrupted to pull the loose end of said thread over said member and through said material.

RUDOLF NAFTALI. VALENTINE NAFTALI. HENRY NAFTALI.

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