US444759A - Sewing-machine - Google Patents

Description

(No Model.) 7 Sheets-Sheet 1. A M LESLIE SEWING MACHINE.

No-l 444,759.

Patented Jan. 13, l1891.V

INVENTOR l V Rs v I :By 72u' Attorney (No Model.) '1 sheets-sneeu- 2.

. A M LESLIE SEWING MACHINE.

No. 444,759. Patented Jan.' 13, 4894.

(No Model.) '1 sheets-sheet 3. A M LESLIE SEWING MACHINE.

Nall/14,759. ,Patented'Jam 18, 189i.

INVENTOR v'zhur MLesZ WITNESSES By 721.3' ttm-nay (No Model.)

' 7 Sheets-Sheet 4, A. M. LESLIE.

` SEWING MACHINE. K No. 444,759.

Patented Jan. 13,1891. Fg.

WITNESSES INVENTOR @d I B!! 712:5' Jtorjneyy Ml-:83126 (No Model.) 7 Sheets-Sheet 5. A M LESLIE SEWING MACHINE.

N0..444,759. Patented Jan. 13, 1891.

WITNESS-Es @.QM,

By fails Attorney (No Model.) 7'Sheets-Sheet 6.

' A. M. LESLIE.

I SEWING MACHINE. No. 444,759. Patented Jan. 13,1891.,

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(No ModeLS 7 sheets-sheen w.

A. 1VI. LESLIE. SEWING MACHINE.

110.444,759. Patented Jan.. 13,1891.

Wim EssEs l lNvENmR.

arnnrr ARTHUR M. LESLIE, OF CHICAGO, ILLINOIS.

SEWING-MACl-HNE.

SPECIFICATION forming part of Letters Patent N0. 44,759, dated January 13, 18911.

Application filed January 13, 1885. Renewed July l1, 1890. Serial No. 358,418. (No model.)

To all whom zt may concern:

Be it known that I, ARTHUR M. LESLIE, a

citizen of the United States, residing at Chicago, in the State of Illinois, (formerly of Cleveland, in the State of Ohio,)have invented a new and useful Improvement in Rotary- Shuttle Sewing-Machines, of which the following is a specilication.

This invention is additional to the improvements in sewingmachines described and claimed in my specifications forming part of United States Letter Patent No. 211,553, dated May 17, 1881, and No. 261,363, dated July 18, 1882; and it consists in an improved rotary-shuttle sewing-machine embodying several novel parts and combinations of parts, as hereinafter set forth.

The general object of my present invention is to produce a rotary-shuttle sewing-machine with link-motions,a positive feed,and a positive take-up, and adapted. by these means and accessories thereof to sew perfectly at high speeds and to be manipulated with quickness and facility.

The special objects of the respective parts or features of the machine, hereinafter set forth and claimed,are as follows, to wit: first, to facilitate inserting and removing the bobbin-case of the rotary shuttle, including provision for keeping the same in position while the machine is working; secondly, to more effectively guard the shuttle-thread against entanglement, and at the same time to facilitate threading the bobbin-case and its tension-arm; thirdly, to more effectively conduct the under thread from the bobbin to the eX- tremity of the arm of the bobbin-ctse by easily-threaded guides; fourthly, to adapt the shuttle to remove from the shuttle-race groove any particles of thread or lint which may ilnd access thereto; fthly, to adapt the shuttledriver to be made of a peculiar effective shape of bent steel; sixthly, to adapt the same to guide or control the needle as to its path in sewing work that throws the needle to one side or the otheigso that when the shuttle-point reaches the needle the latter shall always be straight and in the right position for the shut.- tlc to catch the needle-loop; seventhly, to transmit motion from the shaft of the rotary shuttle to the feed-dog, so that the forward and backward motions of the'latter shall both be positive and transmitted by frictionless and quiet link-motion mechanism working on adjustable cone-pivots; eighthly, to regulate the length of stitch by adj usting said transmitting mechanism; ninthly, to regulate the projection of the feed-dog so operated in a simple and effective way; tenthly, to afford a solid and durablel bearing for the pulley end ot' said driving-shaft and at the same time facilitate its insertion and withdrawal; eleventhly, to provide for quickly relieving the upper thread from tension at will, so that the work may be drawn out without breaking the thread, and, twelfthly, to supplement the guides of the presser-bar by an adjustable link-motion device within the head to keep the presser-foot from shaking in case of' wear.

Seven sheets of drawings accompany this specification as part thereof.

Figure 1 of the drawings is an elevation of my improved rotary or revolving shuttle sewing-machine, showing its front. Fig. 1x is a top view of its spool-holder. Fig. 1Z is a sectional view of the take-up arm. Fig. 2 is an end elevation of the machine, showing the face vof its head and a face view of the shuttle. Fig. 2 is a top view of the shuttle end of the bed-plate. Fig. 2b is a sectional top view of one of the cushioned hinges, and Fig.l 2C is an edge view of the thread cutter and holder on a larger scale. Fig. 2d is a perspective View of the thread cutter and holder on said larger scale. Fig. 3 is an inverted plan view of the inachine,showiug the feed mechanism and other parts below the bed-plate; and Figs. 3 and 3b represent partial cross-sectionson the lines a c and b b, Fig. 3, respectively, showing views of the feed mechanism from opposite planes of vision. Fig. 4L represents a vertical section on the line el 4, Fig. 3=` showing an edge view of the shuttle within its race. Fig. 4t is a face view of the shuttledriven-disk with the shuttle-driver thereon. Fig. 4b is an edge view and face view of the shuttle-carrier detached. Fig. e is a face View of the shuttle with the bobbin and bobbin-case therein. Fig. 4d is a section on the line CZ d, Fig. 4to. Fig. le is an edge View of the shuttle, bobbin, and bobbin-case separated; and Fig. if is a back View of the bobbin-case with the bobbin within it, Figs. en to IOO /' bobbin b.

4f, inclusive, being drawn to twice the scale of Fig. 4. Fig. 5 represents a cross-sectionof the machine in the broken plane indicated at 5 5, Fig. 1, showing a sectional elevation of the parts within the standard. Fig. 5 represents a rear view, partly in section, on the line a a, Fig. 5; and Fig. 5b represents a partial cross-section on the line I) l), Fig. 5, Fig. G represents a large-scale interior view of the face-piece of the head of the machine, showing the parts within it. Fig. 6a is a face view of the backpart of 'the head, showing the parts within it as exposed by removing said face-piece. Fig. G` is a partial vertical section on the line l) l), Fig. G. Fig. 6 isacrosssection of the lower part of the head on the line c c, Figs. 6 and G, and Fig. Gd is a perspective View of parts of the lower presserbar guide. Fig. 7 is a perspective view of the feed-bar and feed-dog, and Fig. 7 is a perspective view of the combined needle-driver disk and take-up cam on said larger scale. Like letters of reference indicate correspending parts in the several figures.

This improved machine has in common with the one shown and described in my last .previous patent aforesaid (No. 261,363, dated July 18, 1882) a hollow arm A and a flat bedplate B, rigidly united with each other, a horizontal driving-shaft S, mainly within said arm, and a parallel rotary shaft S2, driven in an opposite direction by the former, beneath said bed-plate, a cylindrical needle-bar N, carrying a short straight needle n and driven by the upper shaft S, a cylindrical presser-bar P, carrying the presser-foot p and mounted, together with said needle-bar, in the face-piece H of the hollow head formed at the eX- tremity of said arm, a rotary shuttle s, driven by the under shaft S2 and provided with a disk-bobbin b and a non-rotary bobbin-case c, a vibrating take-up arm t and a four-motionA feed-dog f, driven, respectively, by said upper shaft and said under shaft, and other minor details which will be apparent.

C, Figs. 1, 2, 2, 3, and 4 represent a clothplate at the shuttle end of the machine, attached to said bed-plate B by a vertical pivotscrew po at one inner corner, and having as its fastening device a spring-slit so at its other inner corner, where it fits into a re-entrant angle formed b v the front edge of the customary screw-attached throatplate T, and a rib fr left on the bed-plate in milling the seats for said plates C and T. This clothplate is thus adapted to be swung horizontally clear of the opening in the bed-plate which it bridges, and back again into place to facilitate opening and closing the latter in removing and replacing the bobbin-case c and To secure these latter within the shuttle s when said cloth-plate is fastened, should the operator neglect to do so by means of the bobbin-latch or bobbin-case fastening f of the shuttle and to release them automatically, said cloth plate is provided on its under side with a spring-iingerf2, rigidly attached at its upper end to the plate and projecting downward, so as to be about a sixtyfourth of an inch from the inner position of the outer extremity of the under tensionguard g when the clothplate is fastened. lVhen the cloth-plate is swung outward, as indicated by dotted lines in Fig. 2, as said finger f2 moves therewith the bobbin-case and bobbin are released by it without attention. The bobbin-case c, Figs. 2, 4, 4C, 4d, 4, and

4f, has at the left of said guard g, as viewed in Figs. 2 and 4C, an arm d, which coacts with lips Z Z2 on the cap C of the shuttle-race R, to render the bobbin-case non-rotary, as aforesaid, while itis kept in effective position by said lips and forms, primarily, a thread-guide and tension device for the under thread,as in my said previous machine. lt is now wholly composed of twosimple parts with the tension-screw by which they are united. To keep the under thread from slopping over the bobbin b within the bobbin-case c, and thus becoming entangled, the bobbin-case is constructed with a cylindrical portion c', adapted as seen in Fig. et,while at the same time threading the bobbin-case and tension-arm is facilitated. This is best seen by reference to Figs. Ltcand 0. An oblique slit admits the thread to a smooth radial hole, from which a straight open groove extends to a recess behind that edge of the arm a which is next to said guard g. The upper end of said guard projects so as vto stop the thread as drawn toward it in the threading operation, and by continuing a revolving movement of the hand the thread is next engaged with a downwardly-projecting hook on the back part of said arm a, which directs it into a guide-hole in said back part, (seen in dotted lines in Fig. 46,) and from this it passes longitudinally under the front part or spring of the arm and between two projections at the extremity of said back part, one of which projects through a hole in said spring, while the other masks this one and aids in drawing the thread under the spring.

The shuttle s, Figs. 2, 3, 4, 4C, It, and 4, is constructed with a radial hole 7L, Fig. 4c, in its peripheral portion elongated in the direction of motion from immediately behind its point to admit the point of the needle n in the downstroke of the latter, so as to preclude dulling contact of the needle with the shuttle. The shuttle is also constructedwith a radial slit or notch n in its marginal guideflange to engage with and carry out of the shuttle-race any bit of thread which may be carried into it.

The shuttle-driver (l, Figs. 2, 3, et, 4, and 4:, (shown detached in the figure last named,) is constructed with great lightness Yand strength of bent steel, its flat back, by which it is attached to the shuttle-driver disk D, having the contraction joint or slit s2 and a pair of Jcaching-screws, (seen in Fig. 4%) while the efto completely envelop the edges ofthe bobbin,

fective portion of the driver perpendicular to IOO TCS

IIO

said back at one edge is jointless, and has a double inclined peripheral side and a needleadniitting slot s', Fig. ab, which extends from in front ot its apex a to its hind end h and tapers in width fiom its front end to its outlet. The path ot the latter coincides in plane with the correct path of the needle n relatively to the .point of the shuttle s, which point within the shuttle-race projects behind said apex a of the driver and behind or to the right of said slot s', as indicated by dotted outlines of the shuttle-point added to Fig. atl. The wider front end of said slots' admits the point of the needle through it to be deflected to the right or to the left, and the sides of the slot restore the needle to the correct pla-ne before it is reached by the shuttlepoint, which would otherwise strike it and break the needle or miss the needle-loop, which would result in skipped stitches.7 The hub of said shuttle-driving disk D forms, as heretofore, the lifting-cam Z of the feed mechanism, Figs. l, 2, 3, 3q 3b, at, and 7, anda stroke-cam s3, separated from the former by that one of the hanger-bearings h b2 of the under shaft S2 atits shuttle end, completes the furniture of the shaft. A rocking yoke Y embraces said stroke-cam, having its pivot [1 at its lower end and in front of the plane of the shaft S2, but close thereto, said pivot being supported by an extension of said hangerbearing b. Said yoke has in one side a sector slot or groove s4 extending upward from a point in front of its pivot, which receives and coacts with a laterally-projecting rollerstud r at the inner end of a link L, the outer end of which forms a horizontal sleeve S5, which embraces loosely the cylindrical longitudinal member of an -shaped feed-bar F, (shown detached in Fig. 7,) and the other member of the latter projects rearwardly above said lifting cam Z and carries the feed-dog f, as best seen in Fig. 3% Said feed-bar F is mounted on cone-pivots p2 bctween a pair of arms a2, which project from a rock-shaft R', and this in turn is mounted on cone-pivots p3 between a pair of hangerbearings b3 b4, which depend from the bedplate, and a spiral spring S is stretched between a pair of hooks on said rock-shaft and feed-bar to hold the latter down upon the lifting-cam Z', so as to steady its movement. The length of stroke imparted to the feed-dog f is varied for a longer or shorter stitch by shifting said roller-stud r in said sector groove or slot s4, so that it shall be farther from or closer to the yoke-pivot 29', (see Fig. 31),) and this is accomplished from above the bed-plate by means of a longitudinal rockshaft R2, hung beneath the same between said hanger b4 and a hanger if on cone-pivots p", screwed through said hangers, said rock-shaft R2 having a linger-lever f3, which projects upward through a slot s in the bed-plate convenient to the right hand ot the operator, while at that end ot' the rock-shaft adjacent to Said hanger b4 it carries an arm a3, having a laterally-projecting roller-stud r2 at its upper extremity,` which works in a straight groove sT in an enlargement of said link L, and transmits motion to the latter when said finger-lever f3 is moved, so that by shifting the latter backward the feed-stroke and length of stitch are shortened, and vice versa. In the drawings the feed mechanism is shown as set for the greatest length of stitch. Said rock-shaft R2 may be adapted to remain in any position to which it may be turned by said finger-lever f3 by tightening its conepivots p* sufficientlyor byother means, such as are commonly used, for example. It will be observed that all the movements of this linkmotion feed mechanism are positive and provided for by cone-pivots77 orpivot-serews having conical bearing-points, which are adjustable to take up wear, so as to render the motion steady and noiseless. The head of the cone-pivot p forms its bearing-point, and the points proper of the remainder of said cone-pivots form their bearing-points, the part-s which receive them being correspondingly drilled, and each is provided with a jamnut to lock it as adjusted.

To regulate the projection of the feed-dog f, a steel bar b, Figs. 3 and 3a, is interposed between the feed-bar F and lifting-cam Z,.being attached at one end to the back of said feedbar by a countersunk screw SS, and at its other end provided with a vertical adjustingscrew S9, tapped in the steel bar and bearing against the flattened back of the feed-bar, so as to elevate the latter and therewith the feed-dog, more or less, as required.

For rotating the under shaft S2, as aforesaid, from the driving-shaft S, an improved lever-pitrnan mechanism is employed, as illustrated by Figs. l, 3, 5, 5", and 5b, particularly the three figures last named. Said drivingshaft is a crank-shaft, and the wrist of its crank co, being in line vertically with the standard of the arm A, is embraced by a split bearing bo at the upper end of a skeleton lever -pitman LO, which extends downward within said standard and carries at its lower end the screw-pivot of a roller-stud ro, the rectangular roller-slide of which works in the slot or groove of a crank-arm c2, fast on the corresponding end of said under shaft. At mid-length said lever-pitman is provided with a fulcrum, which at once secures the adjustable link-motion quality arrived at throughout my improved machine, and preserves the varying lever action of the lever-pitmam set forth with its eifects in my specification forming part of said patent No. 2al,553, dated May 17,1881. The rear of two members which constitute the body of the lever-pitman LO has a split bearing 67, which embraces a horizontal cross-pin in the bifurcated rear end of a radius-bar or rocking fulcrum FO, and a horizontal sleeve 7b3 at the front end of said rocking fulcrum embraces and is screw-fastened to a steel pivot-pin p", mounted on cone-pivots p at the front of the standard. As

IOO

IIO

shown in the drawings, a screwattached piece A", covering an opening in thc standard of the arm A, supports said screw-pivots p5 p, In practice the arm-casting may accommodate them without any such attachment. The rocking fulcrum F(l is preferably made in two T-shaped parts, the stem of one embracing that of the other and screw-fastened thereon, as seen in Figs. 5 and 5b, to render it adjustable in length for regulating the motion.

The driving-shaft S carries at its protruding end, which is at the right hand of the operator,the customary fast band-wheel XV and loose driving-pulley P', with clutch connections. To afford a solid and durable bearing for this pulley end of said shaft S and at the same time admit the same freely and provide for its withd rawal convenien tly, notwithstanding its crank co, the arm-casting is simply provided with a suitably-projecting boss S, Figs. l, 5, and 5,bored larger than the diameter of the shaft, and a notch n, of sufficient depth and diameter to clear said crank 0, cut in the bottom of said bore, and a flanged and split bushing b9 is fitted to said bore, and ywhen the shaft is in place is turned so as to bridge said notch with its solid side, and tightened by a set-screw inserted through the back of said boss, as seen in dotted lines in Fig. 5. A similar split bushing is held within the inner shaft-bearing by a screw t', Fig. l.

W", Figs. l and 2, represents an ordinary bobbin-Winder mounted on the bed-plate B in position to coact with the belt or band which drives said pulley P.

To provide for turning up the machine or head as mounted upon the table-top TO of its stand, so as to expose the parts below the bed-plate B without unbelting the drivingpulley P', and at the same time to isolate the machine from the stand and floor 1n an effective way, the bed-plate B is made squareended, as shown in Fig. 3, and is hinged to said table-top at the pulley end of the machine by a pair of cushioned hinges H2, Figs. ll, 2, 2b, 3, 5, and 5, one of them shown in detail in said Fig. 2b. Each hinge is composed of a lug on the bed-plate B, (shown at Il2 in said Fig. 3,) and a part which is attached by screws to the table-top. The part last named is bored large and provided with a flanged elastic bushing e, having its flange between the parts of the hinge, and a stud-screw hu, projecting through said bushing from the lug on the bed-plate and adapted to turn freely in said bushing, completes the hinge. The other end of the bed-plate is supported by a pair `of elastic cushions c2, Fig. l, seatedin depressions in the table-top To and coacting with conveniently-located surfaces d2, Fig. 3, on the bottom of the bed-plate B. These surfaces may be formed by depressions, as shown, or byshort legs or studs. For driving the needle a and take-up arm from said driv-4 ing-shaft S, with better provision for resisting and taking up Wear, said shaft S is provided at the needle end of the machine with a combined disk and cam D', Figs. 1, 6a, and 7% the disk end of which is flush With the extremity of t-he shaft and with the inner wall of said head-recess covered by the facepiece H, and is connected by an adjustable wrist-pin screw w with the upper end of a driving-link D2, the lower end of which forms a split bearing a: to embrace a roller-stud y Fig. 6, with which the cylindrical needle-bar N is provided near the bottom of said headrecess. An oil-tube o, Fig. 6, depending within said head-recess, provides for readily lubricating said driving-link from the top of the head. The cam end of said disk and cam D is cylindrical and of large diameter, and is provided with a radial hole, through which its fastening-screw is inserted, as seen in Fig.

l, into the shaft-groove, (seen in Fig. 6%) and is provided with a circumferential camgroove g', Figs. l and 7*", adapted in an ordinary way to operate said take-up arm properly, said take-up arm being provided with a roller-stud r3, fitted to said groove. The takeup arm is adapted to be stamped from platesteel, and at the same time is provided with an extended bearing on the outer end of its pivot-screw p7 by means of a combined bushing and hub h4, Fig. lz, made fast Within the bore of the arm.

The face-plate H, Figs. l, 2, G, (5b, and 6C, is bored at its upper and lowerends to form the vertical guides for the needle-bar N,a in the manner rep resented in Figs. 6 and 6b, With substantial bearings of the solid metal, and beyond these large bores provided with coils of packing material 19S, Fig. 6b, and screw-glands g2 g3, so that the needle-bar may be kept well lubricated and at the same time be kept tight and the escape of oil downward to the cloth be prevented.

For supplying the upper thread to the needle n I provide an improved holder for the commercial spool SO, Figs. 1, l", and 2, as shown in these figures. The essential parts of this holder are a horizontal spindle h5, substantially parallel to the horizontal portion of the arm A, having a head at its needle end and provided with an outwardly sprung split sleeve h6, loose upon said spindle, and as large as or a little larger than the head of the spindle over which the spool SO is passed to apply it to said sleeve, upon which it fits tightly. The upper thread draws freely at the highest speeds from the spool so held, as it is is not necessary that the spool should rotate. From around the smooth head of the spool, directed toward the needle end of the machine, the thread passes through a guide t between a pair of tension-disks t2, through the eye t3 of the take-up arm t and another guide t4 to the eye of the needle n, as indicated in Figs. l` and 2. Said holder-spindle h5 is screwed into a hub hl at one extremity of acasting HO, the other end of which forms a horizontal disk provided with a vertical bore fitted to the customary vertical spindle o, and is provided with a radial clamping- IIO Ils

screw c", by which itis heldin position. Said tensionldisks 252, Figs. 1,2, and (30, are mounted upon a split and screw-threaded spindle 256,-

Fig. 6, together with a tension-spring 157 and a milled nut 25S, and a 1in ger-lever t9, interposed at its lower end between said outer disk and disk, as seen in Figs. 2 and 6, and Yboth disks and the superposed finger-lever t are loosely iitted to the spindle t6, as indicated in Fig. 6C, while the spring rests upon the lever both above and below the spindle. Consequently, if the ripper end of the lever be pressed toward the head H, the nearest point of the convex face of the inner disk will form a fulcru in upon which the outer disk and the linger-lever will turn together', as indicated by dotted lines in Fig. 2, and thus free the upper thread or Lrelieve the tension to the required extent.

Forcutting the threads at the ends of seams by a part of the machine itself, and by the same means holding the ends which connect, respectively, with the bobbin ZJ and spool SO, so that neither of them can be drawn down into the shuttle-race R when the machine is again started, I attach a peculiarly constructed thread cutter and holder T', Figs. l 2 2C, 2,

a and G, to the presser-bar P at a convenient n point, the same having a pair of upwardlyproJecting holding-fingers hs 729, Fig. 2C, at its rear edge, and a cutting-blade c5 integral with the inner or front edge of said linger ha, said parts being united with a split collar cwhich embraces the presser-bar.

`When the operator desires to end a seam, the machine is stopped with the take-up arm t at its highest point, as shown in Figs. l and 2. The presser-footy) is then lifted from the work by means of the lifter L', Fig. 2, andthe right thumb is pressed on the projecting end of the tension-relief lever 259. The thread can now be readily drawn by the left hand, both fromtheshuttle-bobbin l; and the upperthreadspool So without breaking either thread. 'Ihe thread is drawn iirst backward and then upward to the thread cut-ter and holder and between its holding-lingers hs hf) around its cutting-blade c5 and out at theleft. A slight downward pull now severs the thread on the edge of the cutting-blade, and those ends belonging to the machine are held at their eX- tremities between said holding-fingers, and also beneath the presser-foot when the latter is again lowered, so -that they shall not be carried down into the shuttle-race.

The lifter-stud Z3, Figs. l and 2, with which the lifter L engages, is formed on a sleeve L2, Fig. (i, which embraces the presser-bar P within the head, and is clamped thereon in proper position by a screw Zi', Figs. l and 2, workin g within said stud, which is tubular, in customary manner. To steady the presserbar as against lateral movement of the presser-foot, or to keep the prcsserbar from turning, a link L3, Fig. 6, is introduced into the head-recess, the same being provided with a horizontal stud-pin Z5, perpendicular to its rear end, and said sleeve L2 is provided with a split bearing Z6 to work upon said stud-pin, while the frontend of thelinkis slotted or notched and coacts with a screw l?, which passes through the notch of the link into the front of the face-piece II and is tightened more or less, as may be required, to take up wear at this point.

rlo resist wearand keep the presser-bar from shaking in operation, its lower bearing in said face-piece II, as illustrated in Figs. 6, 6, and 6, is bored large and packed and provided with a screw-gland g4 like those of the needle-bar, and is, moreover, provided with a split metallic bushing m, tightened by a setscrew fm. The upper end of the presser-bar is guided by thc customary hollow pressureregulating screw PO, Figs. l, 2, and (i, beneath which, as shown in Fig. 6, is a spiral presserspring S3, which acts on a split collarpCz, clamped in proper position on the presserbar.

Details not herein specilied are or may be of the description set forth for corresponding parts in my previous patents aforesaid or of any approved description.

Having thus described my said improvement in rotary-shuttle sewing-machines, I claim as my invention and desire to patent under this specilicationl. In a rotary-shuttle sewing-machine, a cloth-plate attached by a pivotal screw so'as to swing horizontally, and having an elastic slitted cornerportion forming a fastening means, in combination with a bed-plate having a reentrant angle to coactwith said corner, and a spring-finger depending from the under side of said cloth-plate to retain the bobbin-case in the shuttle, substantially as set forth.

2. In combination with a rotaryshuttle and its disk-bobbin, a non-rotary lbobbin-case having a cylindrical body which completelyfenvelops the edges of the bobbin and provided with a threading-slit in its edge at the back of the case extending to a point midway loetween the disks of the bobbin, a peripheral groove leading therefrom to the face of the ease, and a tension-guard and an upwardlyprojecting arm attached to the face of the case, the arm comprising two parts, one of which is a longitudinal spring, together with a tension-screw uniting them, and one of said parts having a hook or threading finger masked by said tension-guard and a guide hole or slot into which the under thread is directed by said finger, substantially as set forth.

3. In combination with a rotary shuttle and its disk-bobbin, a non-rotary bobbin-case having a cylindrical body which envelops the edges of the bobbin and provided with a threading-slit in its edge at the back of the case extending to a point midway between IOO IIO

the disks of the bobbn, a peripheral groove leading therefrom to thcface of the case, and a 'tension-guard and an upwardly-projecting arm attached to the face of the case, the arm comprising two parts, one of which is a longitudinal spring, together with a tension- Ascrew uniting them, and one of said parts having a thread-guide at the upper end of the arm, and one of them havinga hook or threading-liiiger and a guide-hole at the perimeter of the body of the case, into which the under thread is directed by said finger, snbstan.

tially as set forth.

4. In a rotary-shuttle sewing-machine, the con1bination,with an annular shuttle-race, of a. rotary shuttle having a marginal guideflange provided With a radial slit or notch to carry out of the shuttle-race particles of thread or lint, substantially as set forth.

5. In combination with the shuttle-driver disk of a rotary-sluittle sewing-machine, a shuttle-driver having a shuttle-engaging portion at right angles to said disk inclined in opposite directions and provided with a tapering needle-admitting slot having its widest portion at the apexr so formed, substantially as set forth.

G. In a rotary-shuttle sewingmachine, a bent-steel shuttle-driver having a fiat back portion provided with a contracting slit and a shuttle-engaging portion at one edge thereof inclined in opposite directions and provided with a needle-admitting slot, substantially as set forth. y

'7. The combination,substantially as herein specified, of the rotary-shuttle driver-shaft provided with a stroke-cam and a lifting-cam, a rocking yoke embracing` said stroke-cam and pivoted close thereto, a rock-shaft having a pair of arms, between which the longitudinal member of an L.-shaped feed-bar is pivoted, a link connecting said longitudinal member with said rocking yoke, and a feeddog carried by the other member of the feedbar, for the object stated.

8. The combination,substantially as herein specified, of a link-motion feed mechanism having a rocking yoke embracing the stroke-- cam, pivoted close thereto, connected bya link with the feed-bar, and having a sector groove or slot to coact with a roller-stud on-said link as their coupling, a rock-shaft extending to a con ven ientl y-located slot in the bed-plate and provided thereat with a finger-lever, and an arm projecting from said rock-shaft and suitably coupled with said link for adjustlng said coupling of the latter with said rocking yoke to regulate the length of stitch,in the manner .ing said steel bar, substantially as herein Specified, for regulating the projection of the feed-dog, in the manner set forth.

lO. In combination with the crank shaft Within the arm of the machine, an arm-casting bcred large and notched at the bearing for the pulley end of said shaft, and a flanged bushing-sleeve fastened Within the bearingbore to form a Aclosed bearing and cut od communication with the notch, substantially as herein specified, for the object stated.

ll. The combination, in the upper tension device. of a spindle, a pair of disks mounted thereon having convex faces opposed to each other, a spiral spring Which normally keeps the disks in contact, and a tension-relief lever interposed at one end between the outer disk and the spring and having in common With said outer disk a hole occupied by said spindle and loosely fitted thereto, so that said lever and outer disk are free to turn together upon the convex face of the inner disk as upon a hinge, substantially as set forth.

12. In combination with the presser-bar guided Within the head of the machine at top and bottom of the latter, an intermediate link-guide having an adjustable split connection with the lifter-sleeve and a screw-pivot at its opposite end, substantially as herein specified, for the objects stated.

j ARTHUR M. LESLIE.

Witnesses:

J. W. BURRIDGE, W. H. BURRIDGE.

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