US1256880A - Sewing-machine loop-taker mechanism. - Google Patents

Description

,agay

@chine is constructed rom Whd fises ih@ m'emngng tubuffe hallo?" hea/5. I he base l is disha' 5 amending longiits for- K begaf-actuatd por-M911 wl 21317. Themawmsd #and Wth @y provided A y the strap 10 n A a' @i the pz man whose op ghi ang'es Wif'h he fcc/Los p0 ss Sonneced by means of the stud ,Qd and embaf by 2f, Siri y; at one am i2 the. aezfl @Yank-arm 13 fixed upon dement cw Hb File Ed 'l5 which is embraced .m im boss mt its my stucvp of th@ collar 3 9 secured npon the reciprocating needle-bar 20 onrnaled in the bracketarm head 4- in the usual manner. as represented in fthe drawings, the' needle-bar carries its lower end the multiple needle-clamp 2l provided with the usual sockets in which are vsecured by means of set-screws 22 the Shanks of the needles arranged in aline cross- Wise of me direction ot feed and*s'ubstana tiaily parallel with the main-shaft 5.

Cooperating; with each of the needles is a looper which 1s shown in the drawings constructed in separable blade'and shank portions, the blade 24 'being provided et its ton Ward end with the usual thread-eye 25 andat its rearward end or heel with. the depending extension 26 formed with a, transverse groove il?, The shank portion 28 is in the form of a lint plate having; 'upon one face the trai ,use toiigne or rib 29 itted to the groove- 22( of th tension 26 and a lateral stud 3() i .filth a thread-guiding aperture d' adjacent the heel of the looper-blaoe. nlie shank portion is formed its lower end with a lateral flange from 'which depends thestnd 3l by which it` is secured apen the looper carrier, and the blade portion is secured adjustably in position-upon the shank 28 by means ot a fastening screw 39; passing through an elongated aperture 33 of .e extension tapped into the portion 28.

The point or the loope'i-blade is laterally o'set 'from alinement with the body portion, as represented more particularly in Fig. 8, and its up` fr edge is formed with a thread groove extending; 'from the end of the heel for' lynnd terminating in the conver; tace Athe blade adjacent the aperture 25 at one end oit a transverse guide aperture 35. The looper-blade with its extension is in practice struck np from a sheet metal blank in order to be cheaply constructed in various Shapes and sizesthat are required for diierent stitchingF conditions, the diterent varieties of bla le portion being interchangeable with a. uniform pattern of shank portion. By this means, not only is the construction of the looper facilitated, but a machine litted for one class et stitching may be readily changed for other Work and at a much smaller expense than with loopers of the ordinary construction in which the blade and shank are "formed integral.

Each looper-shank stud issecured adjustably by means of a set-screw 3G Within a socket in the cross member 37 of the loopen carrier 38 consistingot an upwardly extend ing; arm provided with a. 'perforated boss or sleeve 39 and with a lateral extension 40 terminating' in a hall-stud 4l. The sleeve 39 is adapted to of a supporting fulorum-p1n disposed substantially parallel with. the main-shaft and provided at the I rock and slide cndwise upon the reduced Dertien 42 opposite ends with the enlarged l'ccentrically disposed portions 43 and 44, the latter of which is secured removably to the :body of the tulcrum-pin tor convenience in as` sembling the parts and both of which are mounted in suitable bearings of the base l, as indicated in Fig. l.. T he ball-stud el is embraced by a strap l5 of the pitman-lever 46 having at its opposite end the integral lower section 47 of a strap having the cap section 48 and embracing the inclined looper-actueting crank 6, the axis of which is inclined to, but embraced within a plane arallel with and spaced from, the axis of tiie shaft 5, as will be clear from an inspection of Figs. 5, 6 and-7. The strap sectionse'? and .48 are provided with the perforated lugs 47 and 48 adapted to be secured together by means of the screws 49. These lugs are so placed that each of the strap sections projects at one end beyond ,the other and into contact with one ot' the thrust 'lianges 50 disposed at the opposite ends ot .the inclined crank 6 and provided with vlaterally projecting rims 5l slightly overhanging the crank 6 to afford a sur'- ronnding oil cavity Whosel walls may be slightly undercut for better retaining a supply of oil. The screw-receiving apertures of the lugs 48 are of elongated form so as to provide for relative endvvise adjustment of the strap sections to take up Wear.

ln the operation of thc machine, the crank t3 constitutes an actuating element whose rotary movements are transmitted through the member 26 acting as a pitman to the lateral arm 40 of the looper-carrier to impart rocking movements to the latter upon the ful- Crum-pin 42; While Said rotary movements are transmitted through said member 46 acting as a vbratory lever to impart bodily lateral movements to the looper-carrier endwisc of the supportingr fulcrnm-pin 42. The resultant movement imparted by the actuat ing element 6 to the loopcr-carrier mounted land connected therewith as described is such as to cause the looper points to traverse elliptical paths substantially such as that shown in dotted lines in Fig. 11. As represented in Figs. 6 and 7, the crank 6- is so disposed that its axis is inclined relatively to the axis of shaft 5 and also is otl'sct therefrom so that the axes of the shaft and the crank do .not intersect, which causes the progressive. sidewise movement of the looper-carrier during its oscillatory movements in such manner as to cause the looper pointe to traverse elliptical paths Whose axes are substantially parallel With the blades, and thus at an inclination with the shaft 5 and the direction of feed, as represented diagrammatically in Figll in which the dotted ellipse designated :c indicates the path of the looper point, the arrow g/ the direction of endwise movement of the looper llO extending lugs 97 of the frame-plate 93.'

7 8 embraced by a strap 79 `provided with a v transverse erforated boss 80 adapted to receive the s iding pin 81 mountedv in theA lateral arm 82 of the rocking vframe sustained by lthe'fulcrum-piiiiSS and provided with upright arms'Si upon' which is pivotally mounted by means of the pivtal pin 85 the feed-bar 86 to which'is'secured the feed-dog 87. The feed-bar 86 is formed'with the inclined lateral arm 88 formed with a socket 89 to receive the slide-pin 90 which is provided with a strap 91 embracing the iteedlift eccentric 92 also secured upon the main- 'shafh As will be observed, the eccentric 7 8 imparts to the feed-do through the described connections operative movements at right angles to the main-shaft, while the eccentric 92 imparts the usual rising and falling movements to the feed-dog. l

As represented in Figs. land 2, above the base 1 is arranged a supporting frame-plate 93 having secured thereon the fiat bar 94 formed with the tongue 95 extending lengthwise thereof to which is iitted the rearward portion of the throat-plate section 96 whose forward portion rests upon the upwardly The frame-plate is providedin'its forward portion with depending bearing lugs 98 in which is mounted the rod 99 having adjustably secured thereto intermediate the lugs v 97 the blocks 100 which are disposed below the looper paths and are formed with needleguiding notches 101 to receive the pointed extremities ot' the needles 23.

l Mounted within the head i oiE the bracketarm is the usual presser-bar 102 having secured to its lower end the shank 103 of the compensating presser-toot which is shown provided with the independently movable foot-plates 104C opposed to the feed-dog.

The u er thread-handling means corn'-v prise the several tension devices 105 through which the several needle-threads s are led' from the source of supply and thence throughtheir respective guide-eyes 106 of the angular plate 107' secured to the arm 3 from which they are passed through their respectiye eyes 108 of the take-up arm 109 secured to and carried by the needle-bar link 17, over the rigid controlling arm 110 and through the guide-eyes lll of the bent pin 112 secured in the top of the needle-bar to" the respective needles.

n the operation of the machine, each needle descends and in its initial rising movement throws out its thread-loop which is entered by the point of its respective'looper in the initial operative movement of the latter. During this looper movement, the looper-carrier guide-eye 58 moves outwardly and the `bontroller-ariii eyes 56 move inwardly rlilatively to the frontend of the machine ,iso as to approach alinen'ient with the iXed'thread-eye 63, thus giving up slack the needles,

in the ower thread to compensate for the advanc of the looper.

The loopers substantially endwise movement causes the needle-thread loop to slip along its blade without unnecessary distention, the sidewise movement of the looper being only such as to permit the return of its blade upon the opposite side of the needla-path.

As the looper performs its retrograde movement, the thread-controlling elements 58 and 56 perform thread-drawingfmovements opposite to the thread-slackening movements previously described, thereby maintaining the lower thread taut between the looper point and the needle aperture of the throat-plate to insure the passage of the needle-point for a succeeding stitch between such strand of the lower thread and thev for machines employing a plurality of needles .and cooperating loopers for forming simultaneously several parallel lines of stitching. Heretofore it has been customary to set the several needles in a line inclined to the direction of feed and to rock the cooperating loopers in planes at right angles with the direction of feed. By the arrangement described the looper-thread was led around the needle-blade in a substantially U-shaped bend or loop whose parallel limbs were embraced by the needle-thread loop,

and the latter could be readily set upon the lower face of the fabric without undue strain upon the needle-thread.

Such arrangement of the stitch-forming mechanism had the serious disadvantage of beginning the parallel seams in a line at an oblique angle with the direction of feed, so that the seams would never begin nor end parallel wit'h the extremities oi the ordinary piece of work, making it necessary to have some of the seams terminate short of the extremity or others of the seams overrun the end of the work, which in certain-cases was impracticable. According tothe present improvement, the needles are arranged in a line at right angles tothe direction of feed so as to overcome the objection. re-` erred to.

' According to the present arrangement-of posed and reciprocated parallel with the di.-

if the looper-blades-were disiso , along ethe'f face Gi' "che Mme i ing needla-hra, of the el' a with 1 culty bei drawn up, and veli; tigxt teman whim the b'eaking of th@ theaia. the present invembona the 90 with her bfues m1 {mge recton of feed and mceve movements Wthniai econ of feed of such ch rffslltant mofements of h@ 00 vperformed in substanaly al embracing the respecfv@ i l 11m Snape 'm ends of its advance movemen as o "ne z" Ul amversia had l Wou conta@ Wl ich@ medrwem and fesis, 0 me @mem s. ment of the ae ai@ Y ae bhw Viding thread-housing @weve upper edge of "cha impe?? d co; is maintained bet-Ween 'h d1e-thread los@ w as "L0 be injurious engagement W?. he throughou the siichmining cyce.

,She @L @he thread-gfoove S@ being dosed my ih@ thread t is ed i@ me Work 11i n u the forwad end of such groove "le passmg througn me beam, me XK u.;

of looper represen'fd 1m @i @mi im?" L5- 12? n cclmeclon imm 'me pam Movement han@ by mason nf its blade inclined to the direction of feed rier for impartingI to the looper operative movements transversely of the Work-support and in a 'substantially elliptical path having its axes inclined to the direction of feed.

3. En a serving machine, the combination with a work-support and feeding mechanisnl, ot1 stiteh-forming mechanism includ ing a looper-carrier mounted to oscillate transversely of the Work-support and upon an axis at right angles with the direction of feed, e looper sustained by said car 'ier with andactuating means connected Witlil said crrler and adapted to impart to the looper operative movements in a substantially elliptical path having its axis inclined to the direction of feed.,

4:. A sewing machine looper mechanism comprising an endwise and sidewise movable looper, a carrier therefor, an actuating shaft provided with an inclined crank having its axis in non-intersecting relation with that of said shaft, and an operative connection between said crank and looper-carrier.

5.. A sewing machine looper mechanism comprising a looper, a carrier therefor, a supporting ulcrum providing),1 a fixed axis for said ,carrier upon which it isadapted to perforrnboth rocking and bodily laten? movements, an actuating shaft provided with an inclined crank, and a pitmandever having a strap embracing said crank and a pivotal connection Witlisaid carrier eccentric to said supporting ulcrum..

6. A. sewing machine looper mechanism 'comprising a looser, a carrier therefor, a

fixed supporting ulcrum for said carrier relative to which it is adapted to perform both rocking and bodily lateral movements, an actuating; shaft provided with an inclined crank, and a pitman-lever having a strap embracing said crank and a pivotal connection with said carrier adjustable to- Ward and from said slipporting fnlcrnm.

7. A sewing machine looper mechanism comprising a looper, a carrier therefor, ad support upon which said carrier has rocking; and bodily lateral movements upon a tilted axis, an actuating shaft provided with an inclined crank, and a pitman-lev'er having a, `strap embracing said crank and a pivotal connection with said carrier eccentric to said airis'o movement.

8. n a sewing machine, the combination with a work-plate and feeding mecbanism, of Stitch-forming mechanism comprising a plurality of reciprocating needles arranged in a line lperpendicular to the direction of feed, vva plurality of looperseach movable transversely of the work-plate and coperating with one of said needles and having its vblade arranged at an acute angle with they .direction of feed, and actuating; #means for imparting `to said loopers endivise anisnroperating: in a vlc-plate a direcn tion crossivise of said L, ci' stitcb 'forining incclniniszn coniipia i ity of reciprocating, needles a line parallel with said oral fr oi'loopers eacli movable .ni y of the ivorlo plate and cooperating" n one et sazdnee dies and having its blade disposed 'at an inclination with said shaft, n carrier for said loopers, a supporting; 'fulerum upon which. said carrier is adapted to oscillate and slide, and meansr connected with said shaft i'or imperting,` to tbe ioooencarrier compound oscillatory and slidiin., L@temente which are mainly in tbe direction in 'vvliicli the loopen blades entend.4

i0. A, sewing niaciiine loopcr'nieciianism comprising; a leonor, carrier therefor, a ,supporting fuicrpirn for carrier relative to which it is ada'nted to perform rocking and endvvise movements, an actuating shaft provided with an inclined crank having thrust flanges at tbe opposite ends, and a pitnian-iever having; a pivotal connection with said carrier eccentric to the sapporo ing; olcrum and a strap embracing said crank and termed in tivo separable parts each projecting; endwise beyond the other et one end and adapted to rest against tlie adjacent .thrust Hanne of said crank.

11. A sewing machine looper mechanism comprising a loopen, a carrier therefor, a supporting; inlcrun 4for said carrier relative to which it is adapted toperforin botti rockingt and endvfise m veinents., an actuating' shaft provided 'with an Ainclined crank havingr at olie opposite ends thrust danses` with riins over-hanging said crank, and a pitmandevcry having' a pivotal connection with said carrier eccentric to the supporting; fulcruin'j and strap embracing said crank and formed in two senarabie parte each projecting endiv'isc bevond tbe other at one end and adapted to rest against the adjacent thrust tiang'e of said crank.

l2.A A sewing machine looper mechanism composing alf3-oper, a carrier therefor, a l siipporting;r fulcruni upon which said carrier is adapted to' perform rocking movements, an actuating shaft and a rotary actuating element thereon for said loopcr, an operative connection between said element and said carrier, and means operative independ-f ently of said actuating shaft `for shifting said supporting 'fulcruzn toward and from said actuating` element,

i3. A sewing machine looper mechanism comprising .a iooper, carrier therefor, a

ico.

comprising, a loop'er, a carrier therefor, a

supportino fulc'rum upon which said earrier is aoapted to Yperform. rocking Inovements, an actuating shaft, permanent operative connection between said shaft and carrier, and means for retracting said carrier from normal operative position in a direc tion transverse to the axis of said fnlcrum.

25. ln combination, a .Jooper-carrier, a looper, a looper-blade, means for securing the looper upon said carrier in different an guiar relations therewith, and means vvhereby the looper-blade may be adjusted lengthwise relatively to said carrier independently of said securing means.

26. A sewing machine looper comprising shank and blade portions separable from each other, and means for securing them together.

Q7. A sewing machine looper comprising a shank portion provided with a thread-eye, an eye-pointed blade portion se arable therefrom, and means for securing em together. 28. yA sewing machine looper comprising a shank portion, a blade portion, and means for securing the blade portion adjustably lengthwise of the blade upon the shank por- 29. A sewing machine looper comprising a shank portionprovided with a thread-eye and with a transverse tongue, an eye-pointed blade portion having a channel fitted to said tongue of the shank portion, and means for securing said portions together adjustably lengthwise of said tongue.

30. A sewing machine looper comprising inatteso a shank portion and a blade separable therefrontend of substantially 'Hat cross-secti and'p'rovided in one edge with a longitu inally extending thread-housing groove terminating in the side-t`ace of the beak from which the thread is delivered. 31.. A. sewing machine looper comprising a shank portion and an eye-pointed blade separable therefrom with the pointed extremity laterally odset, saidr blade being formed in its upper edgev with a threadroove terminating in the convex face adjacent/saidv eye in a transverse threading aperture.

32. A sewing machine'comprising, in combination, a frame, a Work-support, a reciprocating needle; an.oscillating looper, actuating means sfor imparting reciprocatory movements to said needlev and' loop seizing and sidewise movements to said looper, shiftable means for locking said' actuating means, tand means carried by said frame and operatively connected with said shiftable means for shifting said looper to a po sition for convenience in threading.

33. In a sewing machine, a frame, in cornbination,4 a main-shaft, a reciprocating needie, a movable looper cooperating with said needle, a pivoted looperisupport, actuating;` va

connections between said niain-shaitv and said looper support, means whereby said looper support may be moved from normal to' abnormal position, shiftable means for so moving said looper support, and connections between said shitable means and said main-shaft acting to lock the latter against rotation when said looper support is moid to abnormal position.

ln testimony whereof, l name to this specication, in the presence of two subscribing witnesses.

l annnnr naanrson'nn' von. 7

Witnesses: I

HENRY J. Mmes, HENRY A. KORNEMANN, Jr.

have signed @e

Images