US524338A

US524338A - The nor

Info

Publication number: US524338A
Authority: US
Publication date: 1894-08-14
Anticipated expiration: 1911-08-14

Description

(No Model.)

PF. A.- MILLS...

9-Sheets'8heet 1." LOOP, FORMING MECHANISM FOR SHOE SEWING MAGHINES. No. 524,338. Patented Aug. 14, 1894.

G I 4 O e9 SW87 I Q, 98 0 zy g? 1 (No Model.) 9 SheetS -Sheet F. A. MILLS.

LOOP FORMING MBOHANISM FOR SHOE SEWING MAGHINES. No. 524,338. Patented Aug. 14, 1894.

(No Model)" 9 Sheets- -Sheet a.

F. A. MILLS.

L001? FORMING-MECHANISM FOR SHOE SEWING MACHINES. No. 524,338. Patented Aug. 14, 1894.

9 sheetssheet 4.

' (No Model.)

P, A. MILLS. L00]? FORMING MBGHANISM FOR SHOE SEWING MACHINES.

No. 524,338. Patented Aug. 14, 1894.

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l 9 Sheets-She F. A. MILLS.

LOOP FORMING MECHANISM, FOR SHOE SEWING MAUHINBS. No. 524,338.

Patented Aug; 14, 1894 THE "cams PETERS co. PMo-ro-uwoq wxsmnaron. a. 'c.

" nu Model) 9 Sheets-Sheet 6.

I 4 F. A MILLS. "LOOP FORMING MECHANISM FOR SHOE SEWINGMAGHINES.

No. 524,338. Patented Aug. 14, 1894.

9 Sheets-Sheet 7.

(No Model.)

- P, A. MILLS. LOOP FORMING MECHANISM FOR SHOE SEWING MAGHINES.

No'. 524,338. Patented Aug. 14, I894.

Z128 fizz 0772a s k Jtlllllllw n 1 wins :20. watchman wAsmnsTou, n c,

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F. A. M: LOOP FORMING MECHANISM F0 'No. 524,338.

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(No Model.) 9 Sheets-Sheet 9.

- F. A. MILLS; LOOP FORMING MECHANISM FOR SHOE SEWING MACHINES. No. 524,338. Pafcented Aug; 14, 1894.

m: NORRIS PETERS o0, rumauwa. WASNIHGTON. n c.

FRANCIS ARTHUR MILLS,

on PHILADELPHIA, PENNSYLVANIA, ASSIGNOR,

BY MESNE ASSIGNMENTS, OF ONE-HALF TO JAMES MUNDELL, OF SAME PLACE.

LOOP-FORMINGMECHANISM FOR SHOE-SEWING MACHINES,

SPECIFICATION forming part of Letters Patent No. 524,338, dated August 14, 18 94.

Application filed January 28, 1893. Renewed November 20, 1893. Serial No. 491.442- (N'o model.)

A To all whom it may concern.-

- cifically set forth in Be it known that I, FRANCIS ARTHUR MILLS, a citizen of the United States, and a resident of the city of Philadelphia,

operates with a waxed thread; and my said improvements consist in certain novel parts and combinationsof parts hereinafter spethe claims concluding this specification- Before specifying such claims I will describe the machine illustrated in the drawings.

The following description read in connection with the drawings, will enable any one skilled in the art to-which my-invention relates to understand its nature and to practice it in the form inwhich I prefer to employ it; but it will be understood that my invention is not limited to the precise form herein illustrated and described, as various modifications may be made without departing fromtits spirit and without exceeding the scope of the concluding claims.

Referring to the drawings: Figure l represents a vertical central section of a shoe sewing machine embodying my invention, the needle being shown in the position it occupies in its full, outward movement, and the supporting devices locked in position to sup,-

- port the Work as the loop is pulled and the 50 shows the needle-carrier in side view. Fig.

stitch set. Fig. 2 is an elevation of the right side of the same. Fig. 3 is an elevation of the left side of the machine. Fig. 4 is a front view of the same. Fig. 5 is a rear view of the same. Fig. 6 is a top View of the same. Fig. 7 is an axial section of the separate cam cylinders and showing their connection by the pitman-rod operating crank-pin forthe needle-carrier. Fig. 8 shows an enlarged vertical section of the centerhead structure, the several devices contained therein occupying the position shown in Fig. 1. Fig. 9 (Sheet 1) in the county of, Philadelphia and State of Pennsylvania, have useful Improve- .device for the slide-rest.

10 is a front view of the same; and Fig. ll'a top View of the same, showing the end of its operating pitman-rod and the cheeks for the pivot bearingt-hereof. Fig. 12 (Sheet 6) shows in perspective a portion of the sewing-head and the work supporting, looper and feeding devices thereof. Fig. 13 shows the feed-lever arm in its relation to the shoe channel, illustrating in dotted lines the oblique movements of the feed-lip. Fig. 14 shows'thefeed-lever and its operating cam. Fig. 15 shows the compound feed-lever device. Fig. 16 is a sectional view of the pivot-bearing of the feed-leverdevice. Fig. 17 shows the sewing-head structure divested of its operating devices. Fig. 18 shows the bifurcated front. pillar of the conterhead wherein the sewing-head is secured. Fig. 19 is a side view of the back-gage device. Fig. 20 is a vertical section of the device for operating the back gage. Fig. 21 shows the sliderest. Fig. 22 shows in elevation the locking Fig. 23 illustrates the operation of the looper around the needle to form the loop and place the thread in the barb. Fig. 24 shows the threa'das it is placed in the needle-barb in the operation of forming the loop stitch. Fig. 25shows the centerhead structure in elevation, the looper and the slide-rest devicestherein. V Fig. 26 shows in top view the trunnion-rollson thelooperrod and their relation with the cams which give the looper-rod an inward movement.

Fig. 27 shows circumferential cams for the topfeed-lever developed in profile. Fig. 28 shows the face cam developed in profile, for operating the looper and roll-arm. Fig. 29 shows the cams for operating thelooper. Fig. 30 shows the screw-box for fastening the looper-rod spring to thesewing-head, asseen in Figs. 1

and 8. I I r The machine may be. mounted upon any suitable supporting structure or standard in position for the presentation and manipulation of the work to the sewing, supporting and feeding devices. The structure which contains the sewing, work supporting and-feeding devices, comprises a horizontal base-plate 1,'a centerhead mounted thereon at right angl'es andforming a front and rear pillar 3 and 3' connected by a semi-circular wall 4 making an inverted arch open at its base or top and at each side for the accommodation of separate cylinders having cams for operating the sewing and work supporting mechanism and for the arrangement of the crank connected pitman rod for operating the needle-carrier,

the crank pin whereof unites the said-cam-v ..head, whereby the centerhead can be ad justed in relation to the crank operating-pin of the needle-carrier,- to give theneedle more.

orleSsfrOnt-Ward positionwithrespect to the looperto givethe-proper relation of the needles barb thereto. The front pillar 3 ofthe centerhead has a rectangular vertical opening 10:Fig. 1 8 open at the top within which is mounted the sewing-head,which, for this purpose hasvertical coincident recesses 11, 11 on each side, fitting corresponding

tongues

12,12, on theinne-r walls of the opening 10 in the centerhead,=and when seated in place-within the .latteris secured by-screw bolts 13 passing through the vertical-sides of-the centerhead and into threaded holes 14. in the sides ofthe sewing-head. This sewing-head is constructed of verticalside plates 15, secured together so as to leave an intervening spaceby a front plate lfixand atop plate 17; fastened together by-across screw'18. The right vertical side plate isarohed atits-lower front corner to leave 4 an open-space 15, Figs. 17 and 25,within which carrier. is formed oftwo matching plates 21 21, 10 the inner side wall of-one of which the curved needle 22. is clamped bya cap 23, so

the-acti-ngend 19 of the-feed-lever works at the-side of thehead, Figs. 2, 12 and17, and which-opening allows access tothe needle-- carrier. In-the other vertical side plate the --ne'edle-. carrier isloosely mounted upon a horizontal rocking pin 20, Fig. 10 (Sheet 1). This as t extend to thefront from the lower side f, the -ri rg which latter is arranged to op-. erate, between the sewing-head plates at the arched opening 15 atthe sidethereof, as seen in Figs. 21and 12.

Above the needle-carrier, th rod 24 which carries the looper 25 passes; throughand has a bushed bearing- 92 inthe. front face of the sewing-head. Above this looper rod at the right side of the sewing-head; is mounted the actuating lever 26 of the feed device; whileback of and below the needlecarrier the back-gage 39 is fitted within the slotted bottom of -the sewing-head, see Fig. 20. I make the needle-carrierof two plates to obtain a convenient construction for the mount. ing of the needle-guide between them upon thepivot-pin20 of said carrier, upon which said needle-guide is fixed, while the needle carrier is loosely mounted on said pin so that the carrier and the needle-guide will operate together and also independently of each other. For this purpose there is a space between the pivot bearing ends of the matching plates 21 21, to, receive the eyed'end 29. of. the. needle guide-arm 28, which is pinned to-the pivot by a pin 30, Figs. 9, 10 and 12, which projects so as to be struck by the needle-carrier when the top of the latter moves forward to give an inward movement to the needle-guide to follow the needle back in the function of bracing and guiding it.

For keeping the needle-guide in the proper relation to thebarb of the needle, I fix an arm 31, Figs. 3 and 10, on the other end of the pivot pin 20 of the needle-carrier and connect said arm to a spring 321whichconstantly tends to pull it-back and the needle-guide forward,

so that as the carrier moves forward the guidearm-will be free tomove forward withit. The stoppins '33; Fig. 3, on the outerwall of the left plate of the sewing-head act to limit the movement of the arm 31 and the needle-guide in proper relation to the b'arb'of theneedle. The needle-carrier has cheeks 34,'Figs. 8, 9

and 10, between which the crank operated pitman 35 is connected-by the pin 36. ifThese cheeks arefitted to move-closelybetween the inner walls of the side plates 15 ofthe sew ing-head and the latter thereby serve as guides for supporting the upper end of ,the needle-- carrier-to prevent sidewise looseness in its motion, prevent undue strain upon the pivot 20 of the said needle-carrier, and give a firm movement to the needle in piercing the work.

These cheeks also give a firm sidewise support to the-connecting pitman-rod and-cause it to have a direct central pull in the line of the needlegwhile the crank-pin connected end 1 of the pitman is firmly supported. sidewise between hubs 37, Fig. 7, of cam-cylinders to whichthe crank-pin is fastened. Thisconstruction gives a direct, firm and easymovement to the pitman-rod and to theneedlecarrier, renders them durable, easilyput in place, and allows a renewal of the carrierpivot 20by a bushing 38, Figs. 17 and 25 fitted in the-sewin'g-head.

Forsupporting the'edge of. the sole. at the point of stitching and clear'ofthepointof the needle when feeding the work, Iprovidea back-gage 39 Figs. 8,319. and 20,.car-

ried by theslide 27 dovetailedin the bottom plate of the sewing-head. The back gage is driven forward bya cam 40, Figs. 3, 4.. and 6, in position to support the edge'of the sole just before the needle moves forward to pierce the work. The slide 27 is slotted and is loosely connected by an arm 41, Figs. 8, 19 and 20standing up from a cross pin42'havinga longsolid bearingin the centerhead and having an arm 43 on its outer end at the left side ofthe centerhead provided with a friction roll 44:, which is actuated by the cam 40 to'effect the, positive forward movement and locking of the back-gage. The inward movement of'the back-gage is efiected by a spring or springs 45 connecting the slide and the centerhead. This positive forwardmovement of the backgage is important because it serves to lock the gage when somoved so that the upper of the work can be held firmly against the shoulder of the sole and the tension of the thread does not have to pull the upper against the shoulder. In. sewing machines of this type so far as I know and can find, this looking function of the back-gage has been effected by the uncertain action of a spring such unc'ertainty'being due to the non positive force ofthe spring and the quick action of the needle, which is thereby constantly liable to move in advance of the back-gage. When this occurs the needle will pierce too low into the upper to allow the latter to be drawn to the shoulder of the sole and this draws the upper in the shanks of the shoe so as to preventa smooth setting and makes the shanks more or less irregular because it requires a much greater tension of the thread in drawing the upper in the opposite side. Whereas by giving the back-gage a positive forward movement and a firm look when so moved, it always puts the upper to its place before the needle pierces the upper, and hence the tension is made uniform and there is no unequal drawing of the upper at the shanks. This is particularly advantageous in sewing welted shoes. I provide for adjusting the back-gage so as to limit its distance from the feed-lip to suit the thickness of the material between the bottom of the channel and the edge of the sole, and for giving a suitable clearance for the feed of the shoe, between the feed-device and the back-gagewhen the shoe is being fed. This adjustment is made by setting the cam actuated arm 43, so that it will act to carry the back gage more or less forwardand this is attained by a clam p-screw 45, Fig. 19, passing through a split in the bearing end of said arm 43, so that the latter can be clamped on the cross pin 42 which actuates the slide 27. The slide connected arm 41, Fig. 20, is screwed upon the pivot-pin 42 against a shoulder which makes a convenient joining in the solid metal of the cen terhead, which has a deep recess to receive the arm 41 and through which recess said pin passes.

For supporting the lasted shoe in proper position to the sewing mechanism, I provide a slide-rest arranged below the back-gage and cooperating with it. Its acting end 46 stands vertically with a convex outer face just under the acting end of the back-gage, and curving downward and rearward terminates in a flat bar 47, Figs. 1, 8 and 2l,which is fitted to slide horizontally in guide w'ays 48 48, in the frontand in the rear pillars of the centerhead, and in line with the line of movement of the needle-guide, so that the line of pressure upon it is direct. Its front guide way is preferably of an inverted T-shape, while the guide way for its inner d is formed in a box 48 fixed in the centerhead and open at itse nds and top. A friction clamp block 49 is fitted to block is held in position upon the slide-rest I by a pressure-lever 50 pivoted to the rear side of the centerhead at one side of the box, and crossingover the friction-block, engages a cross-groove Figs. 1, 8 and 22 therein. so as to prevent the block moving with theslide-rest. The other end of this pressure-lever extends beyond theleft side of the centerhead and is constantly forced down by a spring 51 connected to the center-head and adjusted to give the proper degree of pressure upon the lever 50 necessary to bind and lock the slide-rest. This adjustment is made by a tension screw 52, Fig. 3, fitted in a fixed lug 53 at the top of the spring. To release the lock'on the sliderest I provide a lever 54 pivoted at 55 to the left side of the centerhead at a pointjust at one side of and below the free end of the pressure-lever. This lever 54 extends front ward and has afriction roll 56 which engages a side face-cam 57, which is formed to both look and release the slide-rest lever 50, as I shall presently state. The arrangement of the pivot 55 of this cam actuated lever 54 places the short end of said lever just under the free end of the pressure-lever 50, so as to lift'the latter by a screw 58 in the short end on said cam actuated lever, abutting against the under side of the free end of the pressure-l ver andthus when lifting the latter release th pressure of the friction-block 49 on the sliderest and leave it free to be pushed back with I the work. This screw 58 has a jam'nut59 by which the bearing relation of the meetina ends of the two

levers

50 and 54 can b d? j usted to constantly maintain the contact of the pressure-lever upon the cam-lever and the latter in contact with its actuating cam 57, and thusprevent lost motion. The guid box 48 is fitted and secured in a recess in the centerhead and the slide-rest is constantl y f pressed forward by a spring 60, Figs. 1, 8 and 21, which allows it to yield when the shoe is being fed. The outward movementof the slide-rest is limited bya pin 61 therein abut- .ting against the inner wall of the centerhead.

The'compound lever device for locking th slide-rest is such as to allow the cam actuated. lever 54 to be constantly en gaged' with it m and independent of the locking function f the pressure-lever. This allows the latter to.

be lifted by a free and easy movement of the cam-lever, because the latterhas a very short lifting leverage and acts upon the free end of the pressure-lever in vertical line with'the tension spri levers and spring gives the advantage of pla ing the friction-block near the pivot endpf This arrangement of the said I the pressure-lever, and thus obtaining great pressure bya comparatively light-spring.

The device for feeding the shoe as seen in Figs. 2, 13,14, 15, 'and'16, consists of a lever-26 of approximately L-shape pivoted to the right side of the sewing-head-at its-top and carrying at its lower-end an arm 19'which terminates in alip a standing toward the machine and adaptedto enter the channelof the sole. The upper end of this lever has afriction roll 62 which is held down upon a circumferential cam-63' ofa cam-cylinder bya spring 64, Figs.

2 and14 connected-to the centerhead. The pivot bearing of. this lever is fixed toit, is of considerable diameter'and is fitted in a-suitablebushedbearing 65, Figs. 8 and 17-which is seated and secured between'and within rectangulardepressionszin thetop edge of the I side: plates of the sewing-head by the screw 18, which binds said plates together and by the cap plate17on the other side of saidbox. The intermittent rockingmotion of this feedleverimpartsoutwardand inward movements to'its feeding-orli'ppede'nd. Simultaneously with the outward movement the feed-lever hasgimparted to it a lateral or sidewise move-v .ment upon'its pivot-pin, which, forthat purpose slidesroutward inits box, so that thetwo movements will describe azig-zag path or line 68 like that of saw-teeth, as illustrated in: Figs-13. This oblique feed of the lip is outwardfrom the bottom of the channel toward ment which is indicated by the dotted lines 68,

date said rocking movement. The two arms ofthis lever 70 have each a friction roll 71" whichengage vertical-face cams 72 72, Figs 'theright. 1 At the end of this oblique movethe inward movement of the feed lip is effectedtocause it to engage the bottom of the channel 69 and' after, the stitch has been thoroughly. pulled,.th'e said lever is then caused to move back sidewise carrying its pivot-pin in its box, an'dthus moving the feed lip to the left to feed the shoe for the next stitch. For effecting these .lateral movements of the feed-leverl provide a mechanism which consists of ale ver' 70 pivoted to the top plate of the sewing- ,head in the rear of the lateral sliding pin of the feed-lever, and connected at its front end tosaid sliding pin,- by'a vertical pin 71, Figs: Hand 16, which fits into a hole in said slid As this pin is fixed to the feed-lever and has a rocking motion with it this-hole ising-pin.

,largerthan the vertical pin 71 to accommo- 6, 7, and 15, arranged on separate cam-cylinders and which impart a horizontal vibratory .movement to said lever 70, which thereby gives a sidewise movement of the pivot-pin 74, in its box 66 to move the lever 26 sidewise as-stated. This compound movement of the feed-device is such that each complete movementofthe feed-lever and-its return movement. for the'next feed, describe an acute angle, the apex 73 of which is the point at which the feed stroke terminates, as will be understood from Fig. 13. It is from this point .7 3 that the feed-lip describes its oblique path -cision in the channel.

68 to the point atwhich the said lipstops to make the short inward movement from the point from which it describedthe-base line of a right angled triangle. v

The provision of two rolls and two separate cams for operating the lever 70which gives the lateral movements to the channel-lip aof the feed-deviceis important for operating said lever without lost motion and thus keep 15 and '16, of thefeed-lever26 about-three inches long andseven-eighthsof.--an inch in diameter to give a sufficient bearingforthe firm seating of the lever, and itzmay be constructed with steelbearing sleeves 74 fitted :on each end soasto be renewed when worn.

I may also provide this sliding pivot-pinwith a central bore intersecting the side hole which I receives the pin 71 of the top lever70 and I place in this bore steel bearing pins 75 and "76 on-each side of the pin 71 of said top lever. 1 make one of these bearing pins 75 in the form of a screw so-thatits adjustment against the said top lever pin 7l'will takeup any wear, and in this way the feed-lever can be maintained cheaply in perfect working fit. The adjusting screw has a jam nut77 which binds the sleeve and the screw in place; while a nut 78 on the other end of the-sliding pivotrod pin serves tofsecure the feed-lever and bind the sleeve so that these two sleeves 74 form 'fixed partsof the pivot-pin.

IIO

The fulcrum-pin 80' of the bifurcated lever 70 is screwed into the top plate of the sewinghead and has a hushed-bearing in the lever sothat it can be replaced when necessary. See Fig. 8.

I will now describe the mechanism for placing the thread in the barb of the needle and forming the loop around it. It consists of a swinging arm 25 mounted upon the front end of a horizontal rock-rod or tube 24t-which passes through the sewing-head between the cam-cylinders and through the rear pillar of the centerhead so that it has bearings in the sewing-headland in the centerhead and within which it has both a rocking and a longitudinal movement as I will presently-state. At its front end this rod projects from the sewing-head and has the swinging looper-arm which at its lower end has the looper-finger 81 standing at a downward incline toward the needle and when in-its normal position, is to the extreme left of the line of movement of I the needle, and the latter is at its extreme inward position, The upper end of the needlearm is split and is clamped upon the said rod by screws 82. See Fig. 12. The looper-finger is cylindrical, is screwed into the arm and has a central hole 83 which opens at its side 8st to receive and feed the thread. The other end of this rock-rod 24 projects beyond and terminatesin a screw-stem 24', Fig. 8, on

1 finger in relation to the needle.

which a sleeve 85 is fitted between jam-nuts 86 on the screw end and a trunnion-head 87 fitted loosely upon said rod and has frictionrolls 88 which engage face cams 89 for forcing the looper inward. A spring 90 on this rod constantly tends to force the looper frontward and thevprovision of the jam-nuts 86 is for adjusting said rod to properly set the looper- In this adjustment the sleeve 85 abuts against the trunnion-head 87 andas its rolls 88 constantly bear upon their respective cams 89, Figs. 6, S and 26, the jam-nuts therefore acting against thesleeve as a fixed point will set the looperfinger and render the rolls self adjusting on their cams under the action of thespring.

A hushed-bearing 91 is provided at the rear side of the centerheadfor this looper-rod and there is a similar bearing 92 for its front end so that these hearings can be replaced when worn. and is clamped toit bya screw 94 while its lower end has a friction roll 95 which engages a ring cam 96 on the inner vertical face of the left cylinder 97, whereby said arm is moved positively to move the rod and vibrate the looper-arm to the right. The spring 90 has a fixed'connection with the rock-rod orits roll-arm, its other end being screwed into a threaded-box 98, Fig-"$. 8, 25 and 30, and clamped to the inner end of thesewing-head and its torsional force causes the looper-arm to vibrate to' the left. The screw of the box engages the coils of the spring and holds it against the direct force and torsional strain caused by the longitudinal and rocking movements of the looperrod and prevents the spring from having frictional contactwith said rod, so that the conjoint action of the trunnion-head cams 89, the roll-arm 9 6 and the rod spring 90 gives the required revolving motion to the looperfinger. The provision for adjusting the looper-rod serves also to adjust the roll-arm 93 so that it will not come .in contact with the crank connected end of the pitman-rod.

When the adjusting nuts 86 are turned to the left the spring sets the rock-rod and its looper-arm forward, and when these nuts are turned to the right the rock-rod and its looperarm are moved back. This construction and the action of the spring render the trunnion-rolls self adjusting in the line of the rod and upon theircams, and take up any wear that may occur in the longitudinal movements of. the looper-rod 24 or the side movements of the roll-arm 93. An important feature of this looper-rod and its coiled spring is the capacity of the looper arm to yield While moving tothe left so that at any point An arm 93 depends from the rock-rod in i ts movement to the left the looper-arm is looper-arm and permits it to be'arrested and to yield in the contingency stated.

The provision whichI have described for adjusting the looper-rod is important to keep the looper-finger in position todescribe the circle of which the needle will always be the center, because the tendency of the wear is always to allow the looper-rod to work forward under the force of the spring, which,

without being compensated for, would in time cause the looper-finger to strike the needle.

Referring to the cam actuated rolls 88 on the rock-rod for giving the looper its out and in movement's, I fit these rolls loosely on trunnions of the cross-head and hold them-in place by shoulders formed by the cams 72. a See Figs. 6, 7 and 26 on the cam-cylinders. This allows the rolls to be removed for replacement bynew ones by pushing the rock-rod back to clear the rolls of the cam-shoulders.

I have stated that the looper nose is caused to describe a circle around the point of the needle having its barb on the left. In explanation of this I mean that the looper finger or nose makes this circle by a continuous circular movement in which the looper finger in its frontward movement, starting from the left of the needle, moves both to the right and to the left. And in its rearward movement the looper continues tothe left and then to the right and then back to the; leftat the, point from which it started, making a movement in three directions as the looper is movin frontward and three as it is oin b 2 b b backward. This so far as I know and can findis new in forming a loop and placing the thread around a barbed needle.

As stated the needle-carrier is operated by a direct cam motion wherein the crank is mounted in separate cam-cylinders. These cam cylinders 97 and 99, Fig. 7, are each fixed upon a separate shaft 100 which are mounted in separate standards 1 101 on the base-plate of the centerhead. The cam-cylinders are separated to permit of the rotary crank movement of the -pitman-rod between them, and

for access to the cams and mechanism when necessary. The separate cam-cylinders each have a ring cam on its outer side andon its circumference and'the left of said cylinders 97 has an inner side face cam as I will presently describe; These cam cylinders are united to each other by the crank-pin 103 of the pitman-rod which pinhas a screw thread on each end to receive countersunk nuts 104 on the outer sides of said cam-cylinders. The crank-pin is also keyed to the cylinders by means of screw pins 0 0; while the cam-cylinders are keyed to their respective shafts by means of key-pins d d. and screws 6 e which t the belt-wheel.

serve to hold the cam-cylinders fast on their respective shafts so that they can neither turn on nor slide off their shafts. A sleevef on this crank-pin forms a bush-bearing for the 'pitman-rod and the sleeve ends abut against the inner hnbbed sides 37 of said on the base-plate and are secured and made ad ustable by clamp screws h so as to brinlg thecam-cylinders in equal relation to the on -posite sides of the centerhead. lnlconnection with this lateral adjustment of the canicylinders I provide for adjusting the centerliead-atright angles to, the line of shafts by the slot 9 in the base-plate'andthe screw bolt 8, Fig. 1, which secures the centerhead -thereto. The object of this'adjustment is to:

set thecenterhead so that the needle shall have the proper relation to thelooper, and

connection with the side adjustment of tlie cam-cylinders, give all the working parts perfectcentral relation to each other.

sHav'ing described the construction anii function of the several operating devices in the organized machine I will now describe :the means by which these devices are separately and conjointly operated.

As the needle-carrier is operated by its pitman-rod connection to move the needle for ward, the back-gage is at the same time moved forward a little in advanceof the needle in:

position to press theedge of the shoe upper against. the shoulder of the sole to hold them together while pulling thefistitches. This movement of theback-gage is. effected by a circumferential ring cam 40, Figs. 3, 6 and 7,

which has afi-attened surface i of about onefifth of the circumference, so that while this -fiatten'ed part serves where it merges into the circumference of the ring, to cause the back gage to be moved, in and out at the proper time, the concentric part 40 of said cam acts to lock an-d to hold the roll arm 43 anditscon- -nected back-gage 39 in its supporting position'while the stitch is being pulled in tightly. I also make this cam 40 to gradually merge into the true circle-at 2' 2'? to cause it to give a' gradual forward movement to the backgage just before it comes in contact with the work and thus prevent all knocking action 'whichwould result from a sudden outward spring throwot the said gage, and jar the shoe forward so' that the feeding lip would be liable tocut through the bottom of the channel and destroy the sole.

Referring to Figs. 1 and 8, the back-gage,

the needle, the slide-rest and the looper are by the spring 60 attached to the centerhead and to the inner end of the slide-rest, so as to constantly tend to move the latter forward to keep the shoe firmly pressed against the feeddevice. When in this position the slide-rest is locked by the ring cam 57 on the outer side of the left cam-cylinder 97, which cam for about half its circumference is constructed at its lowest part j, Fig. 3, to allow the pressurelever 50 to apply and maintainv the look as stated, while a stitch is being drawn tight. The other half of this cam has a greater concentric radius 57 to act upon and depress the roll-end of the lever to raise and release the pressure-lever from the friction-block 49 and thus allow the .free yielding action of the slide-rest to admit of the free-feedingof the shoe between it and the lip of the feed-lever. The lever of the feed-device ,ehastits compound movement effected as. follows: The

circumference of the right cylinder 9.9. has a slight depression 7c, Fig. 14, of about one-fifth of the same'which gives the inand outmovements to the acting end 19,'o'fth'e feed-lever 26; while the remaining portion of -the cam circumference 63 serves to hold the feed-lever lip a againstv the bottom of the channel in, the sole. A. vertical face-ringcam 72 on,1 each cylinder operates to vibrate the-T shaped lever 70 to move the .feed-lever26, sidewise to .feed thershoeby the saw-tooth. shaped movement of the acting end of. the :feed-lever whichl have described; The-,cam 72which gives. the movement to, feedlthe, shoe, is;- 0n the right-side cylinder 99 and has aicurved surface projection 72 Figs. 14,6 and'27-about one-seventh the circumference of theycam and acts to move the feed-lever the extent of the feed; While the cam 72oni the left side of the cylinderi97 is. of identical construction and acts to move the feed-lever the, distance to make the next. feed of the shoelj Itjwill be understood that assthe feed-lever 26 is vibrated sidewise its friction-roll 62 slides-on the surfaceof the cam63ton antobliquetpath. I have planned all thecamtmoyements so as IIO not to exceed three-eighths of an inchv throw,

which makes the machine easy; running and almost noiseless, not so liable to getout' of order, with comparatively little wear and having quick-movements. Imake' these cams on rings to beveasilyseated, removed and replaced bynewones; whileithe, cylin- 'mechanism: The reciprocating movement is [looper finger 81 to be at the starting point is Fig. 23 which is its starting point in relation 'to the needle, the looper will be caused to de-' scribe a quarter-circle from k to Z by means of the cam 96 moving the roll-arm 93 sidewise and by the action of the spring 90, moving the looper forward. From this point Z.

the looper continues to move to the front of the needle from l -to-m by the action of the said spring, and continues moving-from m to 'n by the action of said spring and cams 89 and so on from n to s by the action of the cams 89 and the cam 96, which completes the circle with respect to the needle and places the thread in its barb u. The course of the looper is now changed from s to t which latter letter is in line with the needle, and the looper remains in this position until the neodle reaches its extreme backward movement. At this point the slide-rest is unlocked and the back-gage is being drawn inward. The

feed device now starts to feed the shoe and at the same instant the looper starts with the feedand traverses from t to is, which completes the operation of the looping mechan-= ism. The path of the looper above described with reference to Fig. 23 can be read with same letters and figures of reference in Figs. 28 and 29 in relation to the roll-arm 93. It will. be understood that in these compound movements of the looper-rod, thespring 90 gives the looping device the forward movement to carry the looper outward, while the cams 89 act on the trunnion-rolls to draw it back positively. The rollarm 93 is actuated by the same spring at the same time by torsion to rock the rod and move the looper to the left; while the cam 96 serves to rockthe rod and move the roll-arm and looperpositively to the right. This construction it will be seen provides for actuating the looper in two directions by one spring and a simple arrangement of cams upon separate cylinders for actuating the looper in two other directions, giving it an easy movement, provides for wear and is practically composed of a compact device carried by a single rod. The

placing of the thread in the barb u of the needle moving inward and while the looper is at the same time moving from the point n to s prevents mislooping of the thread by means of the joint action of the two movements of the looper and needle at the same time, the former from the left to the right and the needle inward. The object of having the looper move to the left at the same instant the feed-device is movingto the left is to prevent the feed-device from dragging or straining the thread as it iscarried by the looper,

and to permit ofa free and easy feed, because these two movements bring the devices together at the point to make the feed at the same'time and work together with a uniform, drawing action on the thread. The arm 19 that carries the channel-lipis made adjustable vertically by means of slotsand bolts seen in Figs. 12 and 13; the looper-arm can be adjusted upon its rod, by its split end and clamp screws; the back-gage can be adjusted by its operating arm 43, and the needle can be set in proper relation to the looper, so that these parts are easily and quickly set in working relation.

The tension device which-I have shown is I with a heavier thread as may be required for the work. In doingthis the out part of the thread is tied to the end of the new thread and the latter is drawn through the machine and the out part of the thread is thrown away. The time of the operator is lost in passing the new thread into the machine and. adjusting the tension to suit the work. To save all this, trouble, loss of time and inconvenience, I provide the machine with tension devices for two separate and distinct threads suited for light'and for heavy stock. For this purpose I use a tension device for each thread which is delivered to the looper-arm, in the finger whereof they are held for separate and in dependent use. The end of that thread which is not in use is held out-of the way.

wax pot in order to join it with a lighter or at the upper end of the looper-arm as seen in they may be of any suitable construction.

The machine is adapted for sewing turned ,or welted work and operates with a curved needle which has a reciprocating or partial rotation to and fro around an axis, and it is formed with a barb on the side inthe direction of the feed, into which thelooper engages the thread in describing a circlearound the needle.

It will be understood that a work table is placed around the stand below the sewinghead, and as the wax-potand tension devices are mounted upon the swiveling member of the stand, such swiveling capacity affords ac cess to these devices, which can thereby be brought around to the front of, the table;

It is evident that immaterial'changes may I be-permitted from the general construction and arrangement of parts contributing toward my invention, and for'this reason I do not wish to be understood as limiting myself in precise detail and construction. It will also be understood that many of the details above described are not essential to the several features of my invention separately considered. This will be indicated in the concluding claims as in any given claim the'omission of an element or the omission of reference to the particularfeatures ofthe elements mentioned is intended to be a formal declaration of the fact that the omitted elements or features are not essential to the invention'covered therei'nr I I have illustrated in the drawings the invention claimed herein in connection with a completeshoe sewing machine, but as to all matters of devices and of combinations of such devices embraced in said machine, other than those which belong to and are covered by the invention claimed herein, they are embodied in separate-anddistinct applications, Serial Nos. 491,159, 491,160, 490,965, 491,443, and 490,383 for Letters Patent filed by me, and are therefore not claimed herein.

Having described a machine for sewingshoes embodying in preferred form the several features of my present invention in loopseparately claim, and desire to secure by Letters Patent, is-

1.- In a sewing machine, the combination of a barbed needle and alo'oper-arm, with a spring connected and adapted by its torsional force to maintain upon said arm a lateral pressure in one direction, and a cam adapted to move said arm in the opposite direction, whereby said looper-arm is positivelyoperated in one direction sidewise, and is free toyield in=the opposite direction in the event of strikingthe needle, substantially as described.

2'. The combination, with a barbed-needle, of a hanginglooper-arm, arock-rod therefor, and a coiled spring on said rod connected to maintain thereon a force both of tension and of torsion, whereby to cushion the looper-arm in the event of its coming in contact with the needle, and means for moving said rd,sub-

stantially as described.

3. 'Thecombinatiomwith a hanginglooper- ;arm a horizontal. rock-rod on which it is mounted a pair ofrolls mounted in a cross- .head loosely fitting on said rod, and a pendent roll-arm fixed on said rock-rod, of cam cylinders engaging said rolls, a face-cam on one of said cylinders engaging said roll-arm,

-and a spring on said rock-rod connecting the latter with the fixed part of the machine, for operating the looper in the way and for the purpose stated.

4; Thecombination, with a hanging looperarm, a horizontal rock-rod on which it is mounted having a pair of rolls mounted in a cross-head loosely'fittedon said rod and a pendent roll-arm fixed on said rock rod, of camsfor engaging said rolls, a spring on said formingmechanism in combination, what I rock-rod-connectingthe latter with a fixed part of the machine,-and meansfor-adjusting the looper-arm in and out in relation to the needle,substantially as described.

5. .In a shoe sewing machine, av looper device comprising a horizontal rock-rod, an arm hanging from one end thereof terminating in a looper-finger, a spring coiled on said rod connected for rocking-itin one direction and for moving it forward, a pair of rolls carried by a cross-head loosely mounted on said rod, and a rollcarrying arm fixed upon and depending from said rod for rocking said rod in a direction opposite to that given to it by said spring, the said pair of rolls being operated to move said rod rearward, wherebysaid looper is caused to describe a circle around the needle, substantially as described.

6. The combination, in ashoe sewing machine of a horizontal rock-rod hav'inga hanging looper-arm at its front end, its other-end terminating in a screw stem, a bearing-sleeve inclosing said screw-stem, a loosecross-head on said rod having a pair of rolls and abutting against the inner end of said sleeve, jamnuts abutting against the other endof said sleeve, aspring connecting said rod to a fixed part of the machine, a-pendent arm fixed 011 said rock-rod, andsuitable cams-for operating said rolls and pendent arm, in the way and-for the purpose stated.

7. In a shoe sewing machine, the combination of the centerhead and the sewing headstructures, and an oscillating curved barbedneedle, with a rod arranged above the needle in'fixed bearings at its front end in the sewing head, and at its rear end in the centerhead,

vice comprising a horizontal rod, a hanging looper arm laterally adjustable on one end thereof, means on its otherend for adjusting it longitudinally, and means for operating it,

substantially as described in combination with an oscillating barbed-needle mounted in the rear ofsaid looper-arm.

10. The combination, with the sewing-head and the centerhead, of a rod mounted horizontally in hearings in each and projecting from both at each end, having a depending looper-arm fixed on its front end,-and a depend-ing arm fixed between its bearings, a

' spring coiled on said rod fixed thereto and to the sewing-head for forcing said rod outward and said arms sidewise in one direction, and

suitable mechanism for forcing said rod inward and said arm sidewise in the opposite direction, substantially as described.

11. In a shoe sewing machine, the combination, with alooper-arm carried by and depending from a horizontal rod, with mechanism for imparting to said rod both a longitudinal anda rocking movement, means for adjusting. said rod longitudinally, and a curved barbed-needle, substantially as described. r 12. In a shoe sewing machine, the looper arm carried by and depending from a hori-' zontal rod, a pair of rolls carried by a crosshead mounted loosely on said rod, a roll-arm fixed on said rod, and a spring coiled thereon connected to give both a longitudinal and a rotary movement to said rod, in combination,

with cams for engaging said pair of rolls and a cam for engaging said roll-arm, whereby the said looper-arm is caused to have a revolving motion in relation to the needle, substantially as described.

13. In a shoe sewing machine, the combination, with the rock-rod, mounted in fixed bearings at each end having a depending looperarm outside of its front bearing and a depending arm between said bearings, with a cam for engaging said latter arm to vibrate the looper to the right, a feed lever device, and a cam for moving it laterally in the same direction as the looper, the action of. said cams being timed so as to cause both the looperarm and the feed lever-device to be brought together at the point to make the feed and give a uniform drawing action upon the thread, as described.

14. The combination of the centerhead and the sewing head mounted on the front thereof, the needle carrier, the feed-device and the back-gage arranged in the sewing-head, with a rod arranged above said devices in fixed bearings in the sewing-head and in the centerhead and having a looper-arm depending in front of said devices, and suitable mechanismarrauged between said fixed bearings for imparting to said rod both a rocking and a sliding movement in the way described.

15. In a shoe sewing machine, a barbedneedle-carrier, means to actuate it, a horizontal rodmounted in fixed bearings in a plane vertically above the needle-carrier, a looperarm dependingfrom said rod in front of said needle-carrier, a spring connected with and I coiled on said rod, fastened to a fixed frame part and acting to constantly move the looperarm both to one side and longitudinally toward the. front, anda depending arm on said rod in rear of the needle-carrier, in combination with cams for moving said rod longitudinally rearward, and a cam engaging said inner arm'to move the looper-arm to the other side against the tension of said spring, and means for adjusting said arm longitudinally to set thelooper-arm in relation to the needle, substantially as described.

16. A loop forming mechanism for sewing machines consisting essentially of a looperarm depending from a horizontal rod, and means for imparting to said rod a horizontal and a rocking movement simultaneously,

consisting of a spring which acts both by tension and by torsion to move the rod to the front and to rock it in one direction, and

cams constructed to act upon said rod to both move it rearward and to rockit in the opposite direction whereby the looper finger is caused to describe a circular path.

17. In a shoe sewing machine, the combination with a curved barbed needle, of a looper arm depending from a horizontal rock rod, and mechanism for causing the looperfinger to describe a full circular path around the needle, consisting of cams acting on said rod to move it longitudinally in one direction and to rock' it in one direction, and a spring which co-acts with such cams by its force upon the looper-rod acting in two directions to move it longitudinally in the opsigned this specification in the presenceof witnesses.

I FRANCIS ARTHUR MILLSJ Witnesses;

A. E. H. J oHNso'N, PHILIP F. LARNER.