US1143795A - Sewing-machine. - Google Patents

Description

V. J.` VAN HORN.

SEWING MACHINE.

APPLICATION FILED MAY I5, 1914.

4 SHEETSAHEET 1.`

Patented Jim@ l22, 1915.

v. 1. VAN HORN. u

SEWING MACHINE. "E

APPLICATION FILED MAYI5, 1914.

Patented 11111622, 1915.

v4 SHEETS-SHEET Z1 A TTOR/VEI vVAN HORN.

SEWING MACHINE.

APPLICATION F|LED`MAY151914. l

Patented June 22, i915.

4 SHEETS-SHEET 3.

- K MME/W0@ APPLICATION FILED MAY15,1914.

\ /.1. VAN HORN. SEWING MACHINE.

4 SHEETS-SHEET 4.

f TTORIVEV Patented June 22, 1915.

VANDIVER J. VAN HORN, OF CHICAGO, ILLINOIS.

SEWING-MACH'INE.

miams.

'Specification of Letters'Patent.

Pat-eluted June 22,1915.

Application filed May 15, 1914s. Serial No. 838,808.

' T0 all whom it may concern Be it known that I, VANDivER J. VAN HORN, a citizen of the United States, residing in Chicago, in the county of Cook and State of illinois, have invented certain new and useful improvements in Sewing-Machines, of which the following is a specification;

The present invention relates to a sewing machine for making a double-chain seam, being a seam made up of two threads, one of which is sometimes called the needle thread but is henein called the top thread being the thread that lies along the top or right side of thework when the seaniis completed,

and the other of which is called by various names, dependingupon the character of the stitch, but is herein invariably called the bottom thread and lies along the 'wrong,"

1 mechanism while the bottom thread passes from a'second spool and thence through suitable guides or eyes to thel looping mechanism, 'the latter being of such construction and having such mode of'operation, and cooperation with the needle that loops are formed in both threads and the loops of both-threads are interlooped lor iiiterlocked lwith each other to form the stitch. l

Nothing 4is herein claimed for the stitch,

stitch. y

Another object of the invention is to provide a sewing machine of the class described with a rotatable member, which /is rotated continuously in one and the same direction, with means whereby it lnot VYonly takes the loop of the top thread and holds it while some subsequent step in the process of forming the stitchis taking place, but in addition forms a loop inf/the bottom thread, draws it throughithe lopof` the top thread and-holds said loop of the bottom thread in sch position that the needle will pass through it with unerring certainty and form' another loop inthe top thread in position to -be taken by the rotatiiigtaker, the firstiiamed loop of the top kthread having meanwhile been passed off of the heel of the loop taker in rear of the needle so that it will embrace the aforesaid loop of the bottom thread.

' Another object of the invention is to positively control the movements and location of the various'parts of the thread, at all critical points throughout the successive cycles of operations that must be carried out in the ruiming of a seainI-this latter term being herein used to vcomprehend a continuous series or succession of individual stitches. This positive control is to avoid all random or haphazard movements of any part of the thread with a consequent possibility of mislocation, atv critical points which mislocation would result in skips or misses in the forming of interlocking of the so related loops of the twothreads by which the vstitches are locked so as to prevent the steam from being such construction that at each stitch-forming operation an excessive length of thread willY not be `drawn from the .respective spools to forman excessive amount of slack at a point between the last stitch and the spool,ithereby dispensing with the need for a take-up, which in machines of this class as heretofore constructed is necessary for takingup the excess slack thread that is drawn into the loop.

Another object of the invention is to provide improved mechanism for 'drawing the loops of the bottom thread into close contact with the bottoni side of the work, and drawing the interlocking portions of the loops of the two threads well -into the work, to the end that the seam shall be as nearly `iiush with the opposite faces of the work as practicable.

Another object of the invention is to pro-.

vide improved', simplified and more durable mechanism by which the loop taker for taking the loops of thetp thread is connected with, and disconnected from its driver.

Another object of the invention is to provide, for transmitting movement from a sol shaft te a loop taker, means of such construction that in a gangjj` machine, or a machine having a plurality of needles arranged side by side, and a loop taker appropriate to each. needle, the transmitting meansA of any particular loop-taker may be applied to or removed from the shaft laterally,

' Without the necessity for first removing all of the -loop-talrers and their driving means between the particular loop-takeiand the one at either end of the gang.

Another object of the invention is to provide, for engaging and disengaging the lloop\taker, a slide operated directly by a simplel stationary eccentric which coperates with the main shaft of the machine.l

With these and other objects, that will ap; pear hereinafter, in view the invention consists in Lhe features .of novelty that are hereinafter described with reference to the accompanying drawings which are hereby made a-part of this specification.

. Preliminarily it may be observed that the running of a seam involves a succession of cycles of operations that must be carried ,starting arbitrarily with the needle up and .at its highest point, as the first position.

In the drawings: Figure 1 'is an end face vieW, on a small scale, of the headof a seW- ing machine Withv the parts in the first p0- sition,-the needle up and at its highest point of travel. Fig. 2 is an enlarged sectional elevation of the stitch forming meehanism With the parts in the third position, the plane of the section being approximately indicated by the line 2 2, Fig. 5. Fig. 3

.isa View similar to the upper portion of Fig. 2 but with only the upper portion of the face plate broken away, and the parts in the fourth position. Fig. 4 is a view similar to Fig. 3 with the parts in the fifth position, some of the parts shown in Fig. 3

being omitted to avoid mere duplication.4

Fig. 5 is a sectional elevation Withtheparts iii the second position, the section being taken on irregular planes which are partly vertical and partly axial and more or less inclined to the vertical. F ig.` 6 is a sectional elevation of the parts shown in the upper position of Fig.

-\ 5, with the parts in the third position. Fig.

7 isa plan view of those parts that are be low ythe line 7-7, Fig. 5, with the parts in the second position. Fig. 8 is a plan View of thoseI parts that are below the line 8 8,

nuages Fig. (i, with'parts in the third position. Fig. 9 is a rear elevation-ou :i larger scale of the parts that are direc/Ltr instrumental in forming the stitch, iii the i'ii'st posiiion. Fig. 10 is a plan view thereof with tlu` work omitted, the second position ol' thv parts being indicated in this ligure by dottml lines. Fig. 11is a view similar to Fig. J, with the parts in the thiril position. Fig. l2 is a plan view thereof with the work omitted. Fig. 13 is a view similar to Figs. f) and l1 with the parts in the fourth position. Fig. 14 is a plan view thereof with the worli omitted. Fig. l5 is a view similar to Figs. 9, 11 and 13 with the parts in the fifth position. Fig. 16 is a plan view thereof with the'work omitted. Fig. 17 is a view on a still larger scale, of the saine parts in the sixth position but viewed fromthe left hand end of the machine. Fig. 18 is aview similar to Fig. 17 showing the parts iii the seventh, and about to come to the first position. In the drawings the several portions4 of the threads are somewhat distorted from their accurate courses, for the sake of clearness. Fig. 19, is a perspective view of the race ring and the cast off finger. Fig. ,20 is a perspective view of the looptaking member. Fig. 21 is an elevation of a combined cam and eccentric for imparting a compound movement to the deecting finger of the looper for the bottom thread. Fig. 22 is a perspective view ofl an adjustable plate having eyes for guiding the bottom thread to the looper. Fig. 23 is a cestion of the deiiecting finger of the looper and the means for imparting to it the desired compound movement. Fig. 24 is a perspective view on an 'enlarged scale of a portion of a seam made by a machine embodying the invention.

The machine of the present invention is similar in some respects` to the machine shown and described in my co-pending application filedon April 13, 1914i, Serial No. 831,527, andwhile all of the several features of the present invention are applicable to a double-chain machine, still some of its features are equally applicable to singlethread or single-chain machines. This is particularly true of the means for driving the loop-taker, and temporarily disengaging the loop-taker from its driving mechanism at such times and points as "will allow the loop-taker to enter and withdrawv from the loop or pass completely through it, according to the construction and operation of the stitch-forming mechanism, whether the loop-taker be in the form. of a shuttle, which is passed through the loop, or a device for simply temporarily holding the loop while some other operation is heilig performed, And there may be still other features of.the machine herein shown and described that will be found to be useful in types of machines other than the one herein shown and described, and I therefore reserve for myself the exclusive right to embody the several novelfeatures of the invention in machines of any type in which they may be found to be useful.

The machine shown has a loop-taker, l, in the form of a segment of a ring, which occupies loosely, so as to be lcapable of being easily and freely moved ltherein, about 4its mechanical aXis, a circular groove or race, 2, formed in the inner surface of a ring, 3, which is ixedly secured to the bed plate of the .machine-head as lby screws, a. rlhe groove or race is formed by counterboring the ring, v3, and the cylindrical wall of this counter bore forms a guide for confining the loop-taker against random movement iadially, relatively to its aX-is. The bottom of the counterbore results in a shoulder which 'restrains the lateral movement of the looptaker in one direction-inward-while it is similarly restrained in the opposite direction-outward-by a face plate, 5, which is secured to the ring, 3, as by screws, 6, the face plate being provided with circular openings, 7, through which the heads of the screws, at, are accessible. The face plate has lon its inner face a circular rib, S, which fits snugly but looselywithin the loop-taker,

' 1, and within this rib the-face plate has a circular recess, 9, to provide clearance for Vthe movement of certain parts hereinafter de' scribed. The'face plate, 5, the rib, 8, and

the race ring, 3, are all cutaway opposite the throat oit' the machine to permit the free and unobstructed yplay of the needle and theseveral parts of the threads whichleXtend downward fronrthe under side of the work to the llooping mechanism. l

The face plate has acentrally located circular opening through whichthe main shaft, 10, of the machine passes, the plate being thickened around the opening asvv shown at 11, to forni an adequate bearing for, the shaft, 10, and also to provide for the forniation of an'eccentric, 12,- wliicli occupies the recess, 9, and the end of which lies close to the outer face of a disk, 13, as also does the inner face of the rib, 8. The disk, 13, is nonrotatively secured tothe shaft, 10, and has in its outer face a diametrical groove, 14, in which lits, so as to be capable of free reciprocation therein, a slide, 15, which i-s contined to strictly rectilinear movement by the straight sides of the groove, 14.

rllhe slide carries at its opposite ends cylindrical pins or plungers, 16, and 16a, respectively, which are radial with respect to the axis of th'e driving disk, 13, and are adapted to be alternately and reciprocally thrust into" or through, or completely withdrawn from sockets, 17 and 17a, respectively, with whichthe loop-taker, 1, is provided at dianietrically opposite points. These sockets preferably take the forni of perforations extending completelythrough the loop-taker radially and the length of the plungers, ,16 and 16, and the amplitude of movement of the slide, 15, are such that when the slide if moved to the limit of its permitted movement'in one direction one of the pluiigers will be coni pletely withdrawn from its socket, (as shown in the case of the plunger, 16,) and therefore out of engagement with the loop-taker, while the other willy Iextend completely through its socket and so to project more or less beyond the periphery of the looptaker, if desired, to permit which the race, 2, may be grooved as shown at 2 or some other provision inade.

The slide is provided with two transverse abutinents located upon diametrical'ly opposite sides of. its transverse middle and also opposite diametrically opposite points on the shaft, 10, and these abutments are preferably in the form of ribs, 18, and 18a, which cross the slide at right angles, and project into a recess, 9, where they lie in the plane of the eccentric, 12. The slide has through it a longitudinal slot, vor opening, 19, through which the shaft, 10, passes freely, without contact, and the slide is preferably const ructed of two similar parts each of which has a part, 15a, which is longer than the diametercf the shaft, and overlaps `and lies against the other part, being secured thereto as by a screw, 20, the two parts, in all of their features, being exact duplicates and therefore reversible and interchangeable. By forming the slide of two separable parts it can be placed upon or removed from the shaft laterally, so that where there is a plurality ofslides on the same shaft any one of them can be removed and replaced without disturbing any of the others.

The periphery of the loop-taking ring has i in it a groove, 21, extending through a suih! cient number of degrees to afford clearance for the end of the needle, and into this groove projects a cast off fing-er, 22', which is made of a piece of plate metal and the shank of which iits tightly in a groove or slot cut in the racc ring, 3, in which itis held firmly, but so as to be capable of adjustment, bya screw, 23, which is tapped into the race `ring and has an enlarged head that engages the shank of thel finger soasto hold it firmly in its adjusted position. The end of the linger is beveled or dressed olf in [such manner that as the bottoni thread is ymoved laterally, in thedi'rection of rotation l of the 'loop-taker, which is indicated by the arrow placed upon it, c., clockwise when viewed as in the drawings) and comes in contact with the linger, it will be thrown out radiallywitli respect to the ring-toward the yunderside of the work and against the front side of the needle vas. shown more clearly in Fig.` 17. This cast4 off finger is l'ior the purpose of freeing in succession the loops oLl' the bottom thread from shoulders, 2l, that are carried by the loop-taker near its heel end, 1b, and are substantially radial to the loop-taker. .lhese shoulders are preferably formed by lcutting down the walls of the opposite sides oi the groove, 21, of the not yet set in the work.

loop-tahcr near its heel end, the cutting down `oeing graduated so that the walls of the groove willgradually increase in height from the bottoms oi' the shoulders to a point in advance or them, as shown at The bottom thread, -B, upon leaving the spool which is not .shown but which may be located in any coir-:enient or desired place, passes through snr"ibly arranged guiding eyes to and through an eye, 26, on a plate,

Q7, having through it a slot QS, through ing, Se, witlrwhich the cylindrical arm, 32,

is provided. Frein this latter end cf the passageway, 30, the thread passes to and through a second eye, 35, with which the plate, A27, is provided, and thence directly or indirectly (as the case may be) to the last nascent stitch, a that has been made but The walls of the various eyes and passages through which the bottom thread passes, engage the thread and by frictional contact therewith hold it under greater or less tension, but for greater uniformity of this tension the thread prel"- erably passes through a tension device as indicated at, o, which may be of any known Aor desired construction, and located in any convenient position. It will be understood that when the pointof the needle, N, leaves the work on its upward movement, this last nascent stitch will be directly in the line of travel of the needle, but during the interval while the needle is moving downward'from its uppermost position and until its point again reaches the work, the forward feeding of the work will take place. This will bring the last nascent stitch aforesaid one step in the rear of the position of the lineof travel of the needle, as shown in Figs. 2,

s, a, 7, s, 1o, 12, 14,16 and 171 The pine,

27, should have been so adjusted that the eye, 35, is slightly in rear of' tl^^ Xie plane of the loop-taker in ivhiclL-vlloneefile lies so that when the worlcsliali hai-e been :fed forward one step, or a distance equal to the length of one stitch, the portion, B1. olfA tlle bottom .thread will entwine upward from the eye, Se', to the-last nascent stitch, n, in the work and at a greater or less angle lo the aforesaid plane in which the needle lies, depending upon the distance the work is fed forward, thus bringing this portion B1, to the position herein arbitrarily called the first position. -While the portion B1, of the bottom thread, B, is in this first position a del'lecting linger, 3G, which is a part that assists in forming the loops in the bottom thread moves in the direction ol the arrow placed upon it in Fig. 10 from the position shown by full lines in said ligure to the position indicated by dotted lines in said h`gure and shown by full lines in Figs. el, 7 12, 14,16 and 17, z', e., closeito the inclined portion of the portion B1, of the bottom thread-the second position.l

It may lhere be stated that the linger, 3G, has near its end a shoulder, 37, formed on a rentrant angle, resulting in a notch, and beyond this shoulder a slender tongne,38, formed in continuation of the. rear oi the finger, 36, and projecting ',ieyond the shoulder, 37.

From this second position the finger, 36, moves directly inward, as indicated by the arrows, in Figs. 5, 7 and 9, to the position shown in Figs. 2, 6, 8,-11, and 12, this being the third position. This endwise movement of the finger, 36, deflects the portion, B1, of the thread `and brings a portion of it tol bear upon the sloping portions, 25, of the walls of' the groove, 21, of the loop-taking ring, 1, in advance of the shoulders, 24, as shown in Figs. 2, 6, 11 and 12, this being the third position. The deflecting linger, 36 then, for a time, remains idle and out of contact with the bottom thread until it is returned to the position shown in Figs. 9

and 10,-its first-position or starting point. Meanwhile the loop taker continues to move on, having beenq'in constant motion during all of the above described movements of the finger, 3G, and during all of this periodv a loop, T1, of' the top thread, T, will partly surround and be held by the loop-taker, l. At the first position the thread of this loop, T1, extends from the eye of the needledownward through the work, thence under the loop-taker and thence upward through the`V work at the last made and set stitch of the seam.

l1s the loop-taker moves onward from the third position the shoulders, 24, will engage the portion, B1, of the bottom thread and form a loop, B2, therein, and will also carry a portion of this loop, B2, through the loop, T1, bringing a portion of it, while still engaged by the shoulders, 24, in front of the line of travel of the needle, as shown in Figs. 3, 4 and 1G.v As the needlecontinues to descend its point will enter the loop, B2, (and the groove, 21, of the loop-taker) and as the loop,- taker continues its movement portion, t, of the top thread which extendsupward from the eye of the needle to andl the loop, B2, will be enlarged until it comes in contact with the cast o inger, 22, as shown in Fig. 16, whereupon it is cast'oi' 'radially with respect to the loop taker and upward toward the work. The needle having by this-time entered it it rwill be caught and held by the needle as shown more celarly inv Fig. 17. The portion, T2, of the top thread which is carried by the needle will form a second loop which as the needle moves upward will be opened up or distendcd and will be entered by the-beak, la', of the loop-taker, 1, and handled inthe same manner as the loop, T1. This is indicated in Fig. 1S, but the actual relations of the parts are somewhat distorted in thisiigure for the sake of brevity and clearness of description. A

It may here be stated that at about the instant the loop, B2, is being cast. off by the cast off finger, 22, the heel 1", of the loop taker escapes from thel loop, T1, and to facilitate the easy movement of the thread the loop-taker is rounded off in both directions-'z'. e., longitudinally and transversely. -At this instantthe needle is still moving downward. In fact, the loop, T1, must n escapebefore the point of the needle reaches the inner surface ofthe loop-taker, else said loop willstrike the needle and cannot pass behind it as shown in Fig. 17. The drag on the thread produced by this downward movement of the needle will draw up that portion of the top thread which passes up; ward through the work, as a result of the preceding stroke of the needle, and thus tighten or set the preceding stitch, Z).

Fig. 17 shows the sixth position with loops of the two threads that enter into the nascent stitch formed and interlooped but in more or less distorted relation to each otheras neither the nascent stitch nor the stitch next, preceding it has been tightened or set. This setting is done in part by the needle and in part by the Ic leflecting finger of the bottom-thread looper. As the needle continues to move downward from the position shown in Fig. 17 it will draw downthat through the work and occupying the opening through the work that has just been formed by the downward movement of the needle. This will draw toward the needle that portion, t1, of the'threadlthat lies along the top of the work and extends to the next preceding stitch, being a continuatifm of that portion, lf2, of said preceding stitch which extends through the work and is a continuation of one side of the loop, T1. This will contract the loop, T1, and draw it well up against the wrong or bottom side of the work. In thus contracting and drawing up the loop, T1, the two sides of the loop, B2, of the bottom thread are like- Awise drawn up against the wrong or bottom side of the work, but the loop, B2, will be left slack and (when the needle moves upward until its point is withdrawn from said loop, B2) extending around the two sides `of the loop, 'T`, of the top thread.

The deiiecting iinger, 36, has a peculiar compound movement which, starting with the parts in the first position, first carries the finger, laterally (see Figs. 7, 9 and l0) toward the path of travel of the needle, to bring the front side of its extension tongue, 38, in contact with, or-at least in close proximity to the inclined portion of the portion lB1 of the bottom thread (see same figures).

In producing this lateral movement ofthe finger', its stem, 39, Vis given a partial rotation about its axis VAwhich occupiesv a plane which is axial with respect to the shaft, 10. The shaft 10 has nonrotatively secured to it la cam-block, 4110, whch has a circumferential A groove, 41, lying in a plane which forms an acute angle to a plane perpendicular to the axis of the shaft, l0, and resulting inparallel cam surfaces, 42 and 13, which are also parallelv with the plane of the groove, 4-1. This groove is occupied by a ring l4` which for convenience in assembling and disassembling is preferably formed in halves se* cured together by screws as-indicated at, 45. The opposite faces of this ring have loose, sliding contact with the cams, 4Q, 4 3, and the ring has a socket, 46, inwhich the lower end of the stem, 39, fits and is iixedly secured as by ascrew, -7.` The stem, 39, is positively prevented from any rotary movement about the axis of the shaft, and consequently the angular 'position ofthe ring relatively to the axis of the shaft will continually change as the shaft rotates. The ring will havea compound movement which is the resultant of its inovementabout an axis which passes through the axis of the stem, 39, and is radial to the axis of the shaft, l0, and its movement about a second axis which is perpendicular to the irst. The stem, 39, is prevented from being carried about the axis of the shaft, l0, by'reason of the facts that passes loosely through, so as toghe capable of both rota-ry and endwise movement therein, an opening through the above-mentioned cylindrical block, 31, and also through the tubular arm, 32, of the block, for which purpose said arm'has lateral openings, 48, which permit the free lateral movement of the stem, 89, back and forth in the axial plane o f the shaft, 10, as a result of the oscillation of the ring, 44, about its second aforesaid axis of movement. The block, 33, is bodily movable back and forth upon a supporting pin, 49, which' projects rigidly from the face platea and isparallel with the axis-of the shaft, 10. This movement of ring, 44, about its second aforesaid axis of movement moves the finger, 36,

endwise so that after reaching the position indicated by dotted lines in Fig. 10 and shown by full lines in Figs. 7 and 12, it will be moved inward endwise as indicated by the arrows placed upon it in Figs. 5, 6, 7 and.9, to the position in which it is shown in Figs. 6, 8, 11, 12, 13, 14, 15 and 16.. This willv deflect the portion, B1, of the bottom thread so that a portion of it will cross the vloop taker, 1, in advance of the shoulders, 24,

as shown most accurately in Fig. 12, Figs.. 8, 12 and 1li being similar in this respect excepting that they show'suceessively different positions ofthe parts of the threads due to the continued movements of the looptaker and the needle. The resultant of these lateral andendwise movements of the finger, 36, will be a movement of its .outer end in a substantially elliptical path. But in addition to these movements the stem-end of the finger is given a bodily up and down movement. rllhis is accomplished by making that portion of the cam block, 40, which forms the bottom of the cam groove, 41, in the form of an eccentric, 50, so disposedthat its majoraxis will throw the ring, 44., upward as the cam, 43, is throwing the finger, 36, inward, as indicated by the arrows in Figs. 5, 6, 7, 9, 11, 13 and 15. As the finger, 36, isv also confined to movement about the axis of the plug, 31, which axis is constantly shifting towardl and away from the loop taker, 1, as the block, 33, slides back and forth upon its supporting pin, 39, the end of the finger, 36, will be caused to duck down behind the loop taker, as-sh'own in 11, 13 and 15., As a result ofall of these factors the finger has a -bodily up and down move- -ment, a lateral oscillatory Amovement about an axis which lies in a vertical plane, and a lateral oscillatory movementyabout a horizontal axis which latter axis is parallel with the stand of the loop taker and laterally movable towardand. from said plane. 'The result of all ofv these movements is a movement of the active part yof the finger (the shoulder 37) in a eireuitous path which lies in a plane that passes outside of the loop taker andis at an angle to its axis of movement. l

The neans for accomplishing the objects of the invention and producing the various movements above particularly described are Jsusceptible of many modifications and variations and I, therefore, vdesire to have it understood thatwthe invention initsbroader aspects is not limited to the details of construction above'particularly described .and

shown inthe drawings.

Wy hatl claim as new is 1- p 1. In a sewing` macl ne, means for form'- ing a double-eheiin-sttch having, in combil v nation, a rotatable member, means for' roy tating it continuously in one and the same direction, and Mechanism having parts `operatively arranged with relation to said rotatable member end coperating therewith to form loops in both the top thread and the bottom thread, said rotatable Amember being adapted to engage and holdl the loops of the top thread and having means for engaging the loops of the bottom thread and drawing them through the loops of the top thread.

2. In a double-chain-stitch s'ewing machine, a rotatable member having a beak arranged to engage and temporarily hold a loop of the top thread, and `having means for engaging the bottom` thread when the top thread is so engaged by the rotatable member, whereby as said rotatable member advances, a loop is formed in the bottom thread and interlooped with the aforesaid loop of the top thread.

3. In a sewing machine., means for forming a double-chain-stitch having, in combinationga rotatable member, means for rotating it continuously in one and the same direction', and mechanism having parts operatively arranged with relation to said rotatable member and coperating. therewith to form loops in both the top and bottom threads, the means for forming the loops inthe two threads being so arranged rela;

tively to each other that the loops of one thread are passed through and interlocke'cl the bottom thread it will form a loop thei'ein and drawsaid loop through the aforesaid loop of the top thread and in a position Vwhere it rsurrounds the path of the needle,

the movements of the needle and revoluble member -being so timed that the point of the needle, in descending, enters and' passes through the lo'op of. the bottom thread, and thereafter the loop of the top .thread escapes from the rotatable member 'and surrounds the two sides of the loop ofthe bottom thread. i

5. In a double-chain-stitch sewing machine, the combination with -a rotatable 4member., lin the form of a segmental ring, and means for revolvlng jit about an axis concentric with-it,`said rotatable member having a beak arranged in position to enter 'a loop of the top thread formed by the preceding stroke of the needle,said member being so` shaped that it distends the loop of the ing the path of the needle.

vLiliane/e5 top thread suliiciently to permit its own passage through it and saidimember having in advance of its heel end a shoulder adapted to engage the bottom thread, of means for engaging the bottom thread when so engaged whereby as said rotatable member advances it will draw va portion of the bottom thread forward, laterally, thereby forming therein a loop and drawing said loop into the afore,

said loop of the top thread, to a position where it' sut-rounds the path of the needle,

'the movements of the needleand revoluble part being 'so timed. that the point of the needle, in descending enters and passes through the loop of the bottom`thread carrying with it a portion of the top `thread which forms a second 4loop in position to be entered by the beak of therevoluble member.

G ln a sewing machine, means for forming a double-chain-stitch, having in combination, a rotatable member, means for \re volving it continuously in one and the same direction, said member being arranged to enter, distend and temporarily hold the loops of the top thread and having means for engaging the bottom thread and means for engaging the bottom thread when. so engaged, whereby as the rotatable memlber advances loops are formed in the bottom thread, and carried to a position surrounding the path of the needle.

7. In a sewing machine, means for forming a double-chain-stitch, having in' combination, a` rotatable member, means for revolving it continuously in one and the same direction, said member being arranged to enter; distend and temporarily hold the loops ofthe top kthread and having means for` engaging the bottom thread and means for engaging the bottom thread when so engaged, whereby7 as the rotatable member advances loops are formed in the bottom thread, and interlooped with the loops of the top thread.

S. In a sewing machine, means for forming a doi1bleChain-stitch, having in combination, a rotatable member, means forrevolving it continuously7 in one and the same direction, said member being arranged to enter. distend. and temporarily7 hold the loops of the top thread and having means for engagingthebottom thread and means .foiengaging the bottom thread when ,so engagethwhereby as the rotatable member advances loops are formed in the bottom thread, drawn through the' loops of the'top thread and carried to a position surround- 9. ln a i double-chain-stitch sewing ma; chine the combination with a rotatable member and means for rotating it continuously til its heel escapes from the loop, said member having near its heel end shoulders pre-` sented forward, means fordisposing a portion of the bottomthread across the periphery of said member in 'advance of the shoulders, and means for holding said portion ofthe bottom thread in this position until, during the forward movement of said member, the shoulders engage it, form a loop therein and'draw said loop into the aforesaid loop ofthe top thread and past thepath of the needle, the movements of said needle and member being so timed that the loop. ofthe top thread escapes from the heel. of said 'member, whereupon vthe loop of 'the top threadescapes past the needle and the loop of the top thread surrounds ythe two sides of the loop of the bottom .thread in rear of the needle. l\

10. In a double-chain-stitch sewing ma-l chine, means 'forforming loops init ie top thread, a member for taking andA temerarily holding said loops, said loop-takingV member being movable in a circularfpath,Y and means for moving it, said loop-takingj member' having a beak arranged to enter and take a loop of the top thread, said loop taking member having also, in rearA of its beak, a forwardly presented shoulder and having clea an`ce\for the point of the needle7 incombination with means for laying a por,-

tion of the bottom thread across the loop-v yrily holding said loops, `said loop-taking member being movable in a circular path, and means for moving it, said loop-taking member having a beak carranged to enter and take a loop of the top thread, said looptaking Vmember having also, in rear of its beak, forwardly presented shoulders aind having also a circumferential groove continuing between said shoulders and alfordingclearance for the point of the needle, in combination with-means for laying a portion ofthe bottokm thread across the looptaking member in advance of said shoulders whereby as thel loop-taking member advances said shoulders will engage that portion of the bottom thread which lies across the loop-,taking member, and means for engaging the bottom thread wherebyas the loop-taking member advances said shoulders will form a loop in the bottom thread and carry 'it through the loop in the top thread and 'to a positionsurrounding the path ofthe needle.

12. In a double-chain-stitch sewing machine, means for forming loops in the top thread, a `member for taking and temporarily holding said loops, said loop-taking member being movable in a circular path, and means for moving it, in combination with means for vlayinga portion of the bottom thread across said loop-taking member, said loop-taking member having means for engaging that portion of the bottom 'thread which is laid across it as aforesaid, wherebyA asthe loop-taking member advances a loop is formed in the bottom thread and carried to a position surrounding the path' of the needle.

13. In a double-chain-stitch sewing lnachine, means for forming loops in the top thread, a member for taking and tempora-v rily holding said loops, said loop-taking member being movable in a circular path and means for moving it, said loop-taking member having a beak arranged toenter and take a loop of the top thread, said looptaking member having also in rear of its beak forwardly presented shoulders and having also a circumferential groove continuing between said shoulders and affording' clearance for the point of the needle, in combination with means for laying a portion of the bottom thread across the loop-taking member in advance of said shoulders, whereby as the loop-'taking member advances said shoulders will engage that portionv of the bottom thread which lies across the looptaking member, as aforesaid, means for engaging the bottom thread whereby as the i loop-taking member advances a loop will be formed in the bottom thread and carried to a' position surrounding the path of the needle and a cast 0E fingerprojeeting into saidgroove and adapted to east the loop of the bottom thread off of said shoulders in vadvance of the needle.

14. In a sewing machine the combination with a needle and a member' adapted to engage and hold the loop formed by the needle, said member beingfrotatable in a circular path and having forwardly projecting shoulders adapted to engage and form' a loop in the bottom thread of .a lcast off finger arranged in front of the path `ofthe 'needle for engaging said loop and casting it off of said shoulders. 15.111 a double-chain-stitch sewing machine the combination with a rotatable looptaking member-'adapted to engage a loop f formedin the top' thread, of a de'fleeting finger adapted to engage and position various portions of the bottom thread and means for operating said defleeting finger, said operating means having means for ineving said fingerl back and forth laterally and means for moving it back and forth longitudinally, whereby its position with relation to the loop of the top thread is changed, both with relation to the plane of said loop and a plane perpendicular thereto.

16. In a double-chain-stitch sewing machine means for forming a loop in the top thread, a loop-taking member adapted to engage and temporarily hold said loop, and means for guiding and holding the bottom thread in lcombination with a defiecting finger adapted to engage the bottom thread and means for operating said finger, said operating means having means for moving said finger laterally toward and from the plane of the loop of the top thread and means for moving it endwise in a direction substantially parallel with said plane.

17. In a chain-stitch sewing machine, a needle, means for operating it, a thread defiecting finger located beneath the bed plate and behind the needle, in'position to engage the needle thread, in combination with means for operating said deilecting finger, said operating means having means for moving the finger laterally toward and from the needle and means for movingr said finger longitudinally in a direction which is transverse to nism of a finger, means for moving it laterally about one axis, means for shifting said axis whereby the finger is moved radially relatively to the axis aforesaid and longitudinally relatively to itself, and means for moving Athe finger laterally relatively to the aXis last aforesaid.

20. In a chain-stitch sewing machine 'a finger for defiecting a thread having, in combination, a stem movable longitudinally and also laterally and radially relatively to its aXis, a ring to which said stem is attached, a camblock having a groove oecupied`by said ring and a shaft about which said cam bleek is rotated, the cam groove aforesaid occupying an angle to the axis of said shaft and that portion of the cam block which forms the bottom of the cam` groove being -f-eccentric to the axis of the shafti eccentric with relation to the axis ofthe shaft, a ring occupying said groove, a stem carrying said-finger and attached to said ring, a part through Which said stem passes so as to be capable of both longitudinal and rotary movement relatively thereto, and

means for supporting said part and permittingof its bodily movement in a direction parallel with the shaft.

22. In a chain-stitchsewing machine, the combination with a loop -taking member movable in a circular path, of means for moving it,said means formoving it having a rotatable melnber, a slide movable radially with respect to said rotatable member and an eccentric engaging said slide, said eccentric being fixed relativelv to the rotatable member.

carrier 23. In a chain-stitch sewing machine, the

vcombination With a loop-taking member movable in a circular path, of lmeans for movingA it, said means having a rotatable member, a slide carried by said rotatable member and movable radially relatively thereto, slide, said` rotatable member having means for confining said slide to movement in a plane perpendicular with the axis of the rotatable member.

24. In a chain-stitch vsewing machine, the

lcombination With a loop-taking member movable in a circular path, of means for moving it, said meansha-ving a rotatable disk provided with diametrical guide-Ways lying in the plane perpendicular to the axis of lsaid disk, a slide engaging .said diametrical guide-Ways and a fixed cam engaging said slide f orvmoving it diametrically relatively to the carrier disk as 4the latter rotates. f I

vANDivEn J. VAN HORN. Witnesses l JOSEPH KRAUSE, D. M. HoPKINs.

and a fixed eccentric engaging said Y

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