US2636463A - Looper operating mechanism for sewing machines - Google Patents

Description

0. QUIST April 28, 1953 LOOPER OPERATING MECHANISM FOR SEWING MACHINES Filed Feb. 17, 1951 4 Sheets-Sheet 1 INVEN TOR. OSCAR QUIST ATTORNEY.

4 Sheets-Sheet 2 O. QUIST April 28, 1953 Filed Feb. 17, 1951 INVENTOR. OSCAR QUIST ATTbRNEY.

April 28, 1953 o. QUIST LOOPER OPERATING MECHANISM FOR SEWING MACHINES Filed Fb. 17, 1951 4 Sheets-Sheet 3 FIG. 4

INVEN TOR.

OSCAR QUIST ATTORNEY.

April 28, 1953 o. QUIST 2,636,463

LOOPER OPERATING MECHANISM FOR SEWING MACHINES Filed Feb. 17, 1951 4 Sheets-Sheet 4 Mull F 811? um" "III | I I 1 ED El l 1 v V m W 11v ENTOR H" OSCAR QUIST Q ATTORNEY.

Patented Apr. 28, 1953 LOOPER OPERATING MECHANISM FOR SEWING MACHINES Oscar Quist, Chicago, Ill., assignor to Union Special Machine Company, Chicago, 111., a corporation of Illinois Application February 17, 1951, Serial No. 211,457

16 Claims. (Cl. 112200) This invention relates to sewing machines and more particularly to the looper operating mechanisms of machines of the type adapted to form a two-thread chain stitch. It is especially applicable to machines of the flat-bed type having a drive shaft which extends longitudinally of the base of the machine frame and particularly those adapted for the production of bags or the closing of filled bags.

Aprimary object of the invention has been to provide connections from the drive shaft to the looper of a machine of the foregoing character, for imparting loop seizing and shedding movements thereto, which are of simple construction, durable and reliable in their operation and which may be readily disconnected or modified manually at will to enable the movement of the looper into a more accessible position for threadmg.

Another object has been to provide connections: of the above indicated character which have readily accessible, and easily manipulable means for disconnecting and reconnecting, or otherwise modifying, the connections for the purposes stated.

A further object has been to provide connections of the foregoing character in a machine in which the looper is of the four-motion type, i. e., is given both loop seizing and shedding movements and needle avoid movements.

Still another object has been to so construct and arrange the means for imparting the four motions of the looper of a machine of the character indicated that the main wear receiving parts may be fully enclosed in a lubricant retaining chamber. This feature is particularly applicable to machines intended for the production of bags or the seaming of similar fiat articles.

Other objects, features, and advantages of the invention will appear from the detailed description of an illustrative embodiment of the same which will now be given in conjunction with the accompanying drawings, in which:

Fig. 1 is a view, largely in front elevation, of a machine embodying the invention, portions of the frame being broken away and other portions being shown in vertical section;

Fig. 2 is a horizontal sectional view through the machine taken just below the work supporting surface, certain parts of the frame below said plane being broken away for clearer illustration of other parts;

Fig. 3 is a detail view, in vertical section along the line 3--3 of Fig. 2, showing the connections from the drive shaft for'imparting needle avoid movements to the looper;

end of which rises a standard [2.

Fig. 4 is an enlarged detail view, largely in elevation but partly in section, showing the con- 7 Fig. 7 is a detail view of a pin forming part of the looper operating connections;

Fig. 8 is a face view of a washer element that is mounted on the pin; and

Fig. 9 is a horizontal sectional view, similar to Fig. 2, but illustrating a modified frame construction and modified means for imparting needle avoidmovements to the looper.

In the drawings the machine has been illustrated in the conventional position assumed for the seaming of flat work, as in the production of bags. It will be understood that when the machine is used for the closing of filled bags, its position will be such that the work supporting surface will be disposed in a vertical plane, i. e., the base and the overhanging arm will have their longitudinal axes disposed vertically, rather than horizontally, and the driving pulley will be at the top. The machine will be supported by a pedestal or the like in substantially the same position as that shown in the patent to Kucera et al. No. 1,577,472, granted March 23, 1926.

The frame of the machine comprises a base Ill having a work supporting surface II from one An overhanging arm 13 projects laterally from the upper end of the standard and terminates in a needle head M. A main drive shaft extends longitudinally of the base and is journaled in suitable bearings therein. To facilitate assembly the shaft is formed in two sections [5 and Ilia (Fig. 2) which are joined by a coupling [5b to provide in effect a single continuous shaft. At its right end the shaft projects from the frame and carries a combined handwheel and pulley l6 through which power may be supplied by a belt, from any suitable source, for operating the machine. A crank portion I! of the drive shaft, in the region of the standard l2, carries a strap member [8. Needle bearings [8a (Fig. 5) are preferably provided between the crank l1 and the strap [8 to reduce j friction. A pin I9 extending laterally at the lower end of a pitman 2 0, and suitably secured thereto, serves to connect the pitman pivotally with upstanding ears l8b integral with the strap member [8. At its upper end the pitman 20 carries a strap 2| which cooperates with a ball pin 22 (Figs. 1 and projecting from the end of a needle lever 23 pivotally mounted within the overhanging arm for rocking movement about an axis 24. The opposite end of the needle lever is connected by a link 25 with a block 26 secured to a needle bar 21 which is mounted for vertical reciprocation in bearing sleeves 28 and 29 carried by the needle head. As will be apparent, the needle lever will be oscillated on each revolution of the drive shaft l5 through the connections described from the crank H. These connections are such that friction is held to a minimum. Binding of the parts is eliminated by the pivotal connection at i5! and the spherical surfaces of the strap 2 i and the ball pin 22. It will be understood that the needle bar 21 carries a needle at its lower end which is reciprocated through the work between successive feeding movements of the latter along the work supporting surface ll.

Cooperating with the needle in the formation of stitches is a looper 39 (Figs. 1, 4 and 6) which isirnounted on the upper end of a looper carrier 3; pivotally supported by a bolt 32, mounted in a manner to be hereinafter described. The shank of the looper 38 is retained in the upper end of the arm 3i by a set screw 33. Intermediate its, ends, the looper carrying arm 32 is provided with a laterally extending ball pin 3A which receives a strap portion 35 of an extensible link 35. At its opposite end the link 36 carries a strap 3! cooperating with a ball pin 38 extending laterally from an arm 39. This arm forms part of a rock member to which is mounted for free rocking movement about a shaft 4! that is suitably journaled in the base of the frame and extends laterally thereof. Rock member it has also integrally formed therewith two spaced parallel arms 42 and 42a which project radially from the axis of the member at an angle of about 90 in relation to the arm 39. A pin 43 (Fig. '1) having an enlarged head which is accessible at the front of the base, is slidably mounted in aligned openings in the arms 42 and 32a,. A spring d4, compressed between the inner face of the arm 42a and a cupped, U-shaped washer (Fig. 8) mounted on the pin, serves to urge the latter inwardly to a position in which its end @311 is seated in an opening in an arm 46 that extends radially from a sleeve il. Washer 45 is slipped over a reduced portion 43b of the pin and is urged by the spring against a shoulder 430 on the pin. Sleeve M issecured by one or more screws 45 to the shaft M. Means to be presently described are provided for rocking the sleeve ll and shaft 4!. A collar 50 secured to the outer end of the shaft fi l prevents axial movement of the latter in one direction, while the sleeve 51 and rock member to prevent axial movement in the opposite direction.

For, rocking the sleeve til the latter has an integral, downwardly and laterally extending socket portion 51 (Figs. 2 and 4) arranged to receive the shank of a ball pin 52. The latter cooperates with a strap 53 at the lower end of a pitman having a strap 5d surrounding a spherical eccentric 55. on the drive shaft i541. Itwill be seen that. through the connections described, the

sleeve-t! and. shaft 41 willbe. oscillated, upon.

each revolution of the main drive shaft. The oscillatory movements of the sleeve will, inturn, be imparted to the rock member ifl whenever the inner end of the openingin the arm 46. However, this connection may be broken by a simple outwardpull upon-the headof the pin 43.. Aslight, downward movemerit ofthe pin afterit; is disengaged,from the;

pin 43 is engaged with the arm Gt will rock the member 40 about the shaft M. Such rocking movement may be effected manually or by gravity or may be facilitated by a spring, if desired. The extent of the movement, however, is limited by the cooperation of the inner end of av screw 56, carried, by the arm 42, with the wall of an enlarged opening 5'! (Fig. 4) in the arm 46. The arrangement is such that the relative movement between the arms 52 and 46, permitted by the screw 55, is sufficient to carry the looper into an accessible position for threading. For greatest accessibility of the looper the handwheel 16 should be turned until the looper is in its mostretractedposition. After threading of the needle the parts may be readily restored to their normal operating condition by slight upward movement of the pin 43 to realign its inner end with the opening in the arm 58, at which time the spring 44 will urge the pin into its coupling position;

For the purpose of imparting needle avoid movements to the looper the bolt 32 upon which itis pivotally mounted is carried by an axial extension 58a of a collar 58b integral with orotherwise secured to a rock shaft 53 (Fig. 2). This rock shaft is journaled in bearings 59 and 60 carried by the frame of the machine. Axialmovement of the shaft is prevented by the collariiiib and a collar 580 secured to the opposite endof the shaft. Rocking movements areimparted to the shaft by the connections. best shown in Fig. 3. 'I'heseinclude an arm 6! clamped to the shaft by means of a screw 62. A pin 53' carried by the arm 8! adjacent'its free end serves to connect the arm pivotally with: pitman 64 which cooperates with an eccentric 65' on the shaft 55a. It will be understood that the needle avoid movements are imparted to the looper: byv

the connections described in properly timed rela..-..

tion to the loop seizing and shedding movements imparted .by the eccentric 55 and to the reciprocations or" the needle.

It will be understood that the machine is provided with suitable work feeding. mechanism,

preferably of the four motion feed dog type,.

spring urged presser means for holding the work against the throat plate and the feed dog, thread controlling and guiding means, and the like.

When used as a filled bag closing machine it is;

preferably equipped with an automatic thread chain cutter, such as that disclosed in the patent to Sauer No. 2,360,284, granted October 10, 1944,.

for severing the chain between bags. Otheracr cessory devicesmay also be included, but. since.- these form no partof the present invention no description thereof need be given.

As best shown in Fig. 2 the base, ortion of the frame isreduced inwidth at its; left end to faci1itate the movement through the machine of the necks of filled. bags. frame, as-indicated in theupper lefthand corner. of Fig. 2, has necessitated certain changesin the form and arrangement of various parts of, the.

work feeding mechanism fromthose employed in an ordinary flat bed machine. These. changesare not required-for machines intended forthe,

production of bags.

In Fig. Qthere is illustrated amodified, con:

struction in which theba-se portion of. the frame:

is provided withan enclosed lubricant retaining housing. This serves to enclose theoperatingmeans for imparting the loop seizin and shedding movements and the needle avoid movements to;the looper and portions of the feedoperating mschani r e n p l differences between this construction and thatshownin Eig Z. arein,

The cuttingaway.v of, the,

to saiciloopeu carrieniou rockingi -thetlatteriabout: its pivot to impart loops seizinge and; shedding"- mouements .tokthe leaner; and; GQDIIBGilibIISifiIQHHi.

said shaft: forcrockfing saidloopersupport-to im part. needle avoid movements to. said:- loopes.

6. In a machine-0f the class:describedthavina:

asframeand: a. drive. shaft-. carried the ehy,.. a

1901381."SIIDIJOITHIDGLEBIMMI mounted in; saidsframes.

alooper carrier; p'ivotallyv mounted. omsaid suPiport; a looperycarriedhm-said carnien means -joln shiftingv said carrier; about: its pivot. to; imparo. loop: seizingand;shedding. movements; to; said looperecomprisingt a plurality of .rock membersmounted tors-rocking movementjahouta common: axis; connections; from .said shaftdoiirockingone;

oi; said members. readilydiseonnectible conned.-

tions foxycausing-rocking; of said memb r ;in..

unis nt..connec ionsfromet eo heni fz-saidz hers; to; said; carrier; for; shitting? the; same. about itszpivot. upon.rockingmovementoiiseid other. otseidxmembers, andyconnectionsfro forrccking; said support; to impart needle avo d; movements; to said .looper;

- 7.: Ina. machine: ofzthe class-described having-a. frame and a drive .shafhcarriejd'thereby, alooper SHPDQIKIQCkabTIK mountedim said frame; a looperr. carrier pivotally mountedonysaid support a;1,oopeucarriecl by said carrier means iorshiftingpsa-id carrier aboutits pivot; to impertloon seizing and;

shedding; movements; to1said; looper;comprisinga plurality of rock members; mountedior rocking; movement: about; a; common axis, connections;

fromsaid-shaft for, rockingeone-of; said: members,

readily disconnectible, connections; forcausing; rojcliingof saidmember in:unison;.conne.ctions...- from. the other; of; saidv members-to; saidv carrier; forshifting: the same aboutfits pivotuponi rook ing;.movementv of said: other of: said memb rs in? r saeine m anss-onsaidsmembers. f r; li itin relative. movement. therebetween uporgdisconnec tion. of said readily" disconnectible; connections, v and connections iromrsaidashaft ionrocking:sai v support. to: impart: needle; avoid-1 moverlie!Its; to;

said looper.

8. In.a .n1achine.of tneclass described having-1a frames. and-1a, drive shaft; carried. thereby; aploopen support rockably mounted-insaidi ame; :a;1oopere r-piv t lly mountedons i supnorta 10 p:

er. carried by said carrier,-. means for shifting;- impert-lo pssei ngl:

saidcarrier aboutitslp ivot and, sheddingv m v m nt ttoasmdiloop nieompnisw s; plurality of rock; members; mount d: ion.

rocking. movement ab ut: a; common; x t. on n ti ns from. saidshaft on ro ki ea one ivsaid;

members, readily isconnectibl onn t ons fo causing; rocking of;sa;id members in; unison; co

support rockably mOunted' in said'framea loop'er" carrier pivotallymounted on; saidsupport, a: looper carried, by. said. oarri'er,. means; f0]; shifting. said carrier. about. its. pivotto impart loop seizing.v

and shedding. movements tov saidjl'ooper; compris s.

ing, a plurality of rock members mounted. for; rocking movement about; aycommon.v aX S,-. .conn ctions from said shaft'ior. ro ing-i. neofisaid ai 'rsheftv nectionsrrom'. the other; of said: members to said; carricr for 1 shifting the same about. its; pivot. upon. rocking movement. of said] other; of said. mem. bers, saidlast mentioned. COIlIlGCtiOllS. including members; neadimedisco A caustnglvrocldneioii said;z;memhers manual son, con nections-lfrdmrtheiotherpofisaichmembers to said. carrier for: shifting-the: sameahoutaits pivot upon;

rockingimovementdffsaid other.ofsaidimembers said last" mentione'dr'connecti ons including a; links. pivotally connected;anoneendito rsaid-'carrier'andz; piwotazlly connected-iat its otherendto said. other; o-tisaidi members; interengaging-means': on said= for limiting. relative; movement: thereabetweenupon disconnectioneofisaid readily dis; connectible connections; andv connections; from said shaft;- for'. rochingzsaid support to impart." needle avoids movementsfo said: loopenv 10 amaohine: of theclass des'ciribedihaving atfazame and; asdrive shaftscarriedrtherehy; a piW-x otall" mounterlilooperacarrieu; a; loopen-carrie by: sea carrier; meansfor:shiftingsaid; carriesabout its ;pivottm.impart' loopeseizingi and; shad dingzmovements to isaidsloopercomprising plu rality oi rocls memberssmounted for? rocking;- movementt: about as common. axis; connections;- from said shaft forsnoci'ringwone ofsaiumemberss readily disoonnectible, comections for causing rocking of" said members unison. connections from: the: other of? said members to said. carrier for shifting-the same: about its. pivotv upon IOclC-e ingrmovement of said" other; oisaid'v members; said: last mentioned: connections including al ink piw. otally connected at one end to said carrier;- and; atthe? other end to said? other of. saidmembers;v and; means: carried; by one, of said: members" co -i operatingwith theother" of" said members for" limiting: relative movement:v thereof:

11. In a machineaof the classdescribed'havine a. frame and; a. drive; shaft carriedfthereby, a loop-1. on support. rockably mounted: in said. frame, at. loopen carrier. plvotally' mounted on. saidasupport, a; loo'p'erv carried. by said" carrien. means. for shifts ing said: carrier about its pivot-z,to-=impart lbop seizing andcshedding movementszto saidzl'o'operg comprising; a plurality. of rock; membensmounted for rocking. movement. about: aicommonzaxisfl cont-t. nections. from saiclwshaft. for rocking-tone oft-said members, a; spring; urged; plunger? arranged: fort-y manual. manipulationi. exteriorofi'saidiifl amet fo disconnectibly connecting said imembers for roclsing movement in unison, connections 'from: the, other oil said." membersato. saidscarrier. forslti-iting I the vsame about itszpivot upon rocking'movemenni of? said othersof: said-1' members;- and: connections;

from. said; shaft-fon-rosking; semi-support; part; needle; avoid movementsxto saidz looperz 12;. In: a: machineof\ the:class::describedihavingt aa frame: anda drive :shaftzcarriecl thereby; aileronor support ro'ckably 'mounted in said: frame-eat looper carrier pivotally:mountedzomsaid:supporti. al'oioper carried-by: said carrier; means fon -shifting'l said carrier aboutv its pivot: toimpar-t loopt seizing and sl'ieoltling moven'ients' to said lboper' comprising-aiplurality of rock members mounted? for rocking -movement-ab'oufi a common asxisj con n'e'ctions from said?shaft for rocking one of said? members; readily disconnectib'le connections for causing rocking of'said' members; in, unison, connections from the other oi said memhers toi'said carrier forshifting the ,same'alooutiits pivotupon, rocking; movement of said other" OQf saidi, meme hers; said lastmentioned, connections" includi'ng ali'nl; haying balhjointpivotalconnectionsliatjt twoends,;with. said carrier andlsaid loth'er, ofsaid. members; respectively;.andj connections,from'sa shaft for rocking saidisupp ort to; iinpartineedle, avoid"; movements; to said Lloo'per,

13; In atseWihg macfiiIiehaving anamawitit.

connections; for

the form and arrangement of certain parts of the looperoperating mechanism. .The bolt 32, upon which the looper carrier 3| is pivotally mounted,:

is carried by an extension 66 of a collar 61 integral with or otherwise secured to a rock shaft 68. The latter is longer than the rock shaft 58 of Fig. 2 and is journaled in bearings 69, 10, and H provided in suitable walls or partitions in the base:of the frame. A collar 12 secured to the shaft 68 at the opposite end of the bearing .69 from the collar cooperates with the latter to retain the shaft against axial movement. As will be seen, the shaft 68 extends completely .through an enclosed chamber formed between walls 13,.

14,15 and 16 of the frame. chamber may be supplied with lubricant to a suitable level for the lubrication of the relatively sliding surfaces within it. The only openings through the walls of thechamber are those which carry the bearings for-the various shafts. Little or no lubricant can escape, particularly when the machine is used asa conventional flat-bed machine for the production of bags and the like.

Rocking of the shaft 68 to impart needle avoid movements to the looper is effected by an eccentric on the drive shaft [5 which cooperates with a strap portion 11 of a, pitman which, at its lower end, is pivotally connected with an arm 18 secured to the shaft 68. These connections may be substantially the same as the corresponding parts shown in Fig. 3. The means for imparting loop seizing and shedding movements to the looper also differ somewhat from the form shown in Fig. 2. Thus the shaft 49 is journaled in three bearings 79, 89 and 8!, bearing 89 extending through the wall 76 of the enclosed chamber. For rocking the shaft .there is secured thereto, within the chamber, a sleeve 82 having a socket portion 83, similar to' part 5| of Fig. 4, which carries the ball pin 52 through which the sleeve and shaft are rocked by the eccentric 55. arm 84, corresponding with arm 46 of Figs. 2 and 4, is formed as a separate member and is secured to the shaft 49 outside of the chamber adjacent: the arm. 42 of rock member 49. In other respects this mechanism is the same as described in connection with Figs. 2 and 4 and operates in the same manner.

It will be noted that the arrangement of Fig. 9 provides for the complete enclosure of the eccentrics and connections therefrom to the shafts which impart both the loop seizing and shedding movements and the needle avoid movements to the looper. Any suitable means may be employed for dispersing the lubricant within the' enclosed chamber to insure adequate and continuous lubrication of the enclosed parts.

While a preferred embodiment of the invention has been described in considerable detail and certain modifications have been suggested, it will be understood that various other changes may be made in the construction and arrangement of the several parts without departing from the general principles and scope of the invention as defined by the appended claims.

What I claim is:

' I. In a sewing machine having a main drive shaft and stitch forming devices. including pivotally mounted looper carrier carrying a looper, the combination of connections from said shaft to said looper carrier for imparting loop seizing and shedding movements to said looper, which comprise a rock member, connections from said'shaft to said rock member for oscillating the latter, a member oscillatable about the axis of said rock member, readily disconnectible means for connecting said oscillatable member with said rock member for oscillation in unison, and connections from said oscillatable member to said, looper carrier for rocking the latter about its.

pivot to impart loop seizing and shedding movements to the looper.

2. In a sewing machine having a main drive shaft and stitch forming devices including a pivotally mounted looper carrier carrying a looper the combination'of connections from said shaft to said looper carrier for imparting loop seizingv and shedding movements to said looper, which comprise a rock member connections from said shaft to said rock member for oscillating the latter, a member oscillatable about the axis of said rock member, readily disconnectible means for connectingsaid oscillatable member with said rock member for oscillation in unison, and con nections from said oscillatable member to said looper carrier for rocking the latter about its pivot to impart loop seizing and shedding'movements to the looper, said looper being shiftable to a threading position upon disconnection of said readily disconnectible means,-and'interengaging means carried by said members for limiting relative movement therebetween upon disconnection of said disconnectible means.

3. In a sewing machine having a main drive shaft and stitch forming devices including a pivotally mounted looper carrier carrying a looper,

the combination of connections from said shaft. to said looper carrier for imparting loop seizing and shedding movements to said looper, which comprise a rock member mounted for oscillation about an'axis transverse to the axis of said shaft, I connections from said shaft to said rock member for oscillating the latter, a member oscillatable" about the axis of said rock member, readily disconnectible means for connecting said oscillatable member with said rock member for oscillation in unison, and'connections from said oscillatable member to said looper carrier for rocking the latter about its pivot to impart loop seizing and shedding movements to the looper.

4. In a sewing machine having a main drive shaft and stitch forming devices including a rockably mounted looper support and a looper carrier pivotally mounted on said support and carrying a looper, the combination of connections from said shaft to said looper carrier for imparting loop seizing and shedding movements to said looper, which comprise a rock member, connections from said shaft to said rock member for oscillating the latter, a member oscillatable about the axis of said rock member, readily discon nectible means for connecting said oscillatable member with said rock member for oscillation in unison, and connections from said oscillatable member to said looper carrier for rocking the latter about its pivot to impart loop seizing and shedding movements to the looper.

5. In a sewing machine having a main drive shaft and stitch forming devices including a rockably mounted looper support and a looper carrier pivotally mounted on said support and carrying a looper, the combination of connections from tible means for connecting said oscillatable member with said rock member for oscillation in uni- "son, connections from said oscillatable member a work supporting base, a shaft extending longitudinally of said base, means for advancing work transversely across the base and stitch forming devices including a looper having loop seizing and shedding movements across the line of feed, the combination which comprises a pivotally mounted looper carrier, a pair of rock members mounted on an axis transverse to the axis of said shaft, connections from said shaft to one of said members for rocking the same, manually disconnectible means for connecting said members for rocking in unison, and a link pivotally connected at its two ends with said carrier and the other of said members, respectively.

14. In a sewing machine having a frame with a work supporting base, a shaft extending longitudinally of said base, means for advancing work transversely across the base and stitch forming devices including a looper having loop seizing and shedding movements across the line of feed, the combination which comprises a p-ivotally mounted looper carrier, a pair ofrock members mounted on an axis transverse to the axis of said shaft, connections from said shaft to one of said members for rocking the same, a spring urged plunger serving to connect said members for rocking movement in unison, said plunger having a manually engageable portion accessible at the front of said frame for shifting said plunger into an inactive position, and a link pivotally connected at its two ends with said carrier and the other of said members, respectively.

15. In a sewing machine having a frame with a Work supporting base, a shaft extending longitudinally of said base, means for advancing work transversely across the base and stitch forming devices including a looper having loop seizing and shedding movements across the line of feed, the combination which comprises a pivotally mounted looper carrier, a pair of rock members mounted on an axis transverse to the axis of said shaft, connections from said shaft to one of said members for rocking the same, a spring urged plunger serving to connect said members for rocking movement in unison, said plunger having a manually engageable portion accessible at the front of said frame for shifting said plunger into an inactive position, interengaging means carried by said members for limitrelative movement therebetween when said plunger is in its inactive position, and a link pivotally connected at its two ends with said carrier and the other of said members, respectively.

16. In a sewing machine having a frame with a work supporting base having an enclosed lubricant retaining chamber, a shaft extending longitudinally of said base, means for advancing work transversely across the base and stitch forming devices including a looper having loop seizing and shedding movements across the line of feed, the combination which comprises a looper support rockable about an axis parallel with said shaft, a looper carrier pivotally mounted on said support for pivotal movement about an axis transverse to that of said support, a pair of rock members mounted on an axis transverse to the axis of said shaft, connections from said shaft to one of said members for rocking the same, connections from said shaft for rocking said support, both of said connections being at least partly disposed within said enclosed chamber, manually disconnectible means for connecting said members for rocking in unison, and a link pivotally connected at its two ends with said carrier and the other of said members, respectively.

OSCAR QUIS-T.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 2,029,233 Hacklander Jan. 28, 1936 2,029,2l2 Le Vesconti Jan. 28, 1936

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