US593735A - Sewing machine - Google Patents

Description

(No Model.) 4 Sheets-Sheet 1. G. HpOOLLE-Y. SEWING MACHINE.

No. 593,735. Paten d Nov 16,1897,

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(N0 ModeL 4 Sheets-Sheet 2. G. H. GOLLEY.

SEWING MACHINE.

zPatented Nov. 16,1897.

i'l ltl'z (No Model.) v 4Sheets-Sheet 3. G. H. OOL'LEY v SEWING MACHINE. No. 593,735. Pat-enteq Nov. 16,1897.

(N6 Model.) 4 Sheets-Sheet 4.

' G. H. OOLLEY. SEWING MAGHINE.

No. 593,735. Patented Nov. 16,1897.

m: uonms PETERS ca, vnn'ro-uma. WASHINGTON. o. c.

' UNIT D STATES PATENT rrros.

GEORGE H.- COLLEY', OF JACKSON, MICHIGAN, ASSIGNOR TO THE WEEKS- COLLEY MANUFACTURING COMPANY, OF SAME PLACE.

SEWING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 593,735, dated November 16, 1897.

Application filed February 18, 1897. I Serial No. 624,037. (No model.)

To all whom it may concern Be it known that I, GEORGE H. COLLEY, a citizen of the United States, residing at J ackson, in the county of Jackson. and State of Michigan, have invented certain new and useful Improvements in Sewing-Machines;and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same. This invention relates to sewing-machines, but more particularly to machines employing rotating loopers, such as disclosed in my pend ing applications, Serial Nos. 595,020 and 595,021, filed June 10, 1896. v

The objects of the invention, like that disclosed in the applications referred to, are to provide efficient means for producing various artistic figures in needle-work for decorating or ornamenting wearing-apparel in imitation of the very expensive method of performing such work by hand and to provide a looper or loopers which will yieldingly hold the bobbin-thread and automatically rewind or take up so much of the thread paid out by the bobbin as may not be utilized in formingthe usual lock-stitch, so as to adapt the machine to be used for that class of work known as flossing without forming long stitches on the under side of the cloth, which are liable to be out or broken and thereby permit the work to unravel or be easily pulled out, the desired figure or design being formed upon one side only of the cloth instead of upon both sides, as is usual in doing this class of work with machines heretofore in use.

Further objects are to provide means for varying the tension of the spring of the looper which automatically rewinds or takes up the underlying thread paid out by the bobbin, to providev improved means for .stopping the stitch-forming mechanism after each com plete reciprocation of the needle or to permit said mechanism to be constantly operated, and to provide mechanism for vibrating or oscillating the presser-foot, so that said foot may conform to the oscillatory or vibratory movement of the needle, so as to work alternately with the loopers, or to permit the presser-foot to have simply a vertical movement when the needle is working with one looper only.

The invention will first be hereinafter more particularly described with reference to the accompanying drawings, which form a part of this specification, and then pointed out in the claims at the end of the description.

Referring to the accompanying drawings, in which similar letters denote similar parts, Figure 1 is a sideelevation of a machine embodying my invention, the machine being removed from the usual cabinet and operating mechanism. Fig. 2 is a fragmentary side elevation, partly in section, looking at the opposite side to that shown in Fig. 1. Fig. 3 is a sectional plan view, partly in elevation, of the mechanism for vibrating or oscillating the presser-foot and means for connecting said mechanism to or disconnecting the same from the main driving-shaft. Figs. A are vertical transverse sections through the bracket or overhanging arm, taken on the line IV IV of Fig. 3 and looking in opposite directions,

illustratifig the clutch device for connecting the needle and the presser-foot vibrating mechanisms to or disconnecting the same from the main drivingshaft. tical transverse section taken on the line V V of Fig. 2, illustrating the means for stopping the stitch forming mechanism after each stitch or at the will of the operator. Fig. 6 is a detail plan view of the sliding lockingbar. Fig. 7 is a fragmentary plan view of a portion of the machine with the sliding plates covering the loopers removed. Fig. 8 is a detail view, partly in section and partly in elevation, of the looper and the bracket or support therefor. Figs. 9, are detail views of the two members forming the looper, so as to removably hold the bobbin-casing therein. Fig. 10 is a bottom or underneath plan view of the looper, the bottom plate being removed.

Fig. 5 is a ver- Fig. 11 is a detail plan view of the bottom Fig. 12 is a detail elevataking up the underlying threads of the de-v I00 Figs. 13 are detail per- 5 sign. Figs. 15 and 16 are detail perspective and vertical sectional views, respectively, of the bobbin-casing. Figs. 17 are detail perspective views of the tension devices. Fig. 18 is a detail elevation of the bobbin. Fig. 19 is a vertical sectional view through the bobbin-casin g, illustrating one form of means for varying the tension of the take-up spring. Fig. 20 is a detail plan view of the bobbincasing, the bobbin-thread take-up devices being removed. Fig. 21 is a detail underneath or bottom plan view of the friction-disk and arbor; and Fig. 22 is a top plan view of the friction-disk, arbor, and tensioning devices.

The machine may be constructed with the usual base-plate A and the overhanging arm or bracket B, in which the main driving-shaft C may be suitably journaled. This shaft, by which motion is also imparted to the looperdriving shaft D, may be connected to the needle-bar, so as to impart a vertical reciprocatory movement thereto, and may have a spiral cam 0 arranged thereon, adapted to vibrate a lever c, which latter may be connected through the link 0 to the rack 0 said rack meshing with a segmental or other gear on the needle-bar, so as to vibrate or impart a partial rotation to said bar in the usual manner. The presser-foot d and its bar may be automatically raised and lowered and properly timed with regard to the movement of the needle-bar, and for this purpose a cam may be secured to the driving-shaft O and arranged to engage an arm (1 on a springpressed rod (P, which may have an outer bifurcated arm or finger cl, engaging a pin or projection 011 the presser-foot bar, so that as the shaft rotates the cam will engage the arm (1 of the rod and lift the presser-foot, and when the cam passes said arm the recoil of the spring will immediately force the presserfoot downwardly to hold the work.

A band-wheel E may be loosely mounted on the shaft 0, which in practice is driven continuously by a belt extending, as usual, to some driving-shaft near the machine, one side of this band-wheel being held in frictional contact with a stop-wheel E, which latter is fixed on the shaft 0. This stop'wheel may be provided with a peripheral tooth or projection e, secured to or formed integrally therewith andadapted to register with a notch c in a sliding or looking bar E arranged in a suitable bracket E the parts thus far described, as well as the tension and take-up devices, being substantially the same and opcrated in a similar manner to that disclosed in my pending application, Serial No. 595,021, heretofore referred to, though other constructions may be employed, if desired.

For the purpose of operating the lockingbar E so as to stop the driving-shaft O and the several mechanisms operated thereby or to permit said shaft to rotate constantly at the will of the operator, I may provide a cam-bar F, Figs. 2 and 5, arranged to slide vertically in the bracket E said bar having a cam-slot f therein engaging a pin or projection f, carried by the locking-ba1z This cam-bar may be connected by a link or otherwise to a suitable treadle, (not shown,) so that the operator by the usual heel-and-toe movement may raise or lower said bar to cause the notch in the locking-bar to register with the tooth c of the stop-wheel, so as to permit constant rotary motion of the shaft 0, 'or to cause the tooth to engage a portion of said locking-bar, so as to stop the driving-shaft and stitchforming mechanism after the formation of each or any number of stitches.

The looper-driving shaft D may be suitably journaled underneath the bed or work plate A and may have a gear 9, arranged to mesh with a similar gear on the counter-shaft 1 which latter may be'suitably journaled in brackets g and 9 depending from the under surface of said bed-plate, the bracket being preferably ad justably secured by screws or otherwise to the bed-plate. A bracket may also be adjustably secured to the bedplate, and in this bracket, as well as in the bracket 9 may be journaled vertical shafts or stems 9 Fig. 8, each having a miter-gear secured to its lower end and meshing with a similar gear arranged on the counter-shaft 9, so that said shafts may rotate continuously in the same direction and at such a speed as to make two revolutions to one complete reciprocation or up-and-down movement of the needle-bar. The shafts are arranged on opposite sides of the throat-plate G and may each have a recess or socket therein provided with a slotted bottom adapted to receive the stem portion 71', depending from the casing II of the looper II, so as to cause said looper and shafts to rotate in unison. Each looper may have a bottom plate 7L, fitting loosely over the stem portion h and provided with a pin, as at 7L2, adapted to fit into an aperture in the body portion of the looper, and with an upwardly-extending lip, as at 715, arranged beneath the loop-engaging end or point of said looper, though this plate may be dispensed with or the lip formed on or secured to the body of the looper, if desired. The looper may have an internal groove or channel and may comprise two members having a portion of the groove or channel in each member adapted to receive a peripheral rib on the bobbin-casing so that the latter may be rotatively held in the looper, the member of the looper, as at 7L5, being removably secured to the looper-casing H, so as to permit the ready removal or insertion of said bobbincasing. The bobbin-easing may have its upwardly-projecting flange partially cut away and at or near its upper portion may be provided with a projection h, having a curved upper surface which partially or wholly spans the space between the flanges of the bobbincasing and the looper and is adapted to assist in carrying the loop over said bobbincasing while being shed or cast off by the looper, and to one side of said projection may be arranged a lip or projection b adapted to enter a recess in the lower portion of the throat-plate, so that said casing may have a slight oscillatory or rotary motion to permit the loop after it is shed by the looper to pass over said lip through the recess in the throatplate to the work. An arbor or stem 72. may

' project from the face or lower plate of the bobbin-casing, the lower surface of which is preferably curved, and may have a frictiondisk 72*, provided with a tubular sleeve or hub 71 journaled on said arbor, so as to provide a space between the under surface of said disk and the upper surface of the face-plate of thecasing, in which space is arranged a coil or other'suitable spring h, having one end secured to the bobbincasing and the other end to the friction-disk,a pin, as at 71 being provided, adapted to engage a pin h f, carried by the friction-disk, so as to limit the rotary motion of the latter to practically, though not strictly, a complete rotation. The

spring h is thus adapted to yieldingly hold the friction-disk in a fixed position relatively to the bobbin-casing, while permitting a limited rotary movement thereof, and to automatically return it to its normal position after it has been rotated bya pull upon the thread carried by the bobbin, the frictiondisk being moved in one direction against the tension of the spring by pulling the bobbinthread and returned to its normal position by the recoil of the spring when the bobbinthread is released. Adjacent to the frictiondisk' is placed a friction ring or collar h adapted to fit over the hub or sleeve h, in frictional engagement with the outer face of said disk, and by means of a split or suitable spring-washerh and a collar h, adj ustabl'y secured to the hub or sleeve of the frictiondisk by a set-screw or otherwise, the frictionring may be secured upon said sleeve, and

by adjusting the collar 71. in such position as to cause the ring to contact more or less closely with the disk the pressure or friction between the disk and the ring may be varied so as to regulate the tension or hold upon the bobbin-thread to meet various requirements in use. A screw it", having an annular head, may be screwed into the end of the axis or arbor of the bobbin-casing, so as to confine the friction-disk between the head of the screw and a shoulder or flange formed on the arbor h The bobbin I is preferably of the ringshaped construction shown, having a circumferential groove or recess in its periphery to receive the bobbin-thread that may be wound thereon, and it may be locked to the frictionring in any proper manner which will render it readily detachable for filling, as by means of a lug 2' on said friction-ring 72. engaging a notch or recess 7? in the bobbin, or vice versa, so that the friction-ring and bobbin shall rotate together, the friction-disk and manner of arranging and holding the bobbin against the actionof a spring, as thus described, be

ing substantially the same as disclosed in my before-mentioned applications.

By the described construction the bobbinthread may be delivered direct from the bobbin through the reduced portion of the bobbin-casing or through a slot, as at 71., Fig. 15, and when said thread is pulled the bobbin and the friction-disk and friction-ring will rotate together so long as the friction between said disk and ring is sufficient to cause them to move in unison, or until the rotating disk reaches the limit of its movement by contact of the stud or pin thereon with the stop or pin on the face-plate of the bobbin-casing, whereupon any further movement of the bobbin, by virtue of a force sufficient to overcome the friction .or tension caused by the frictional contact of the friction ring and disk, will be independent of said disk, the latter remaining stationary, while the bobbin and friction-ring continue to rotate.

To vibrate or partially rotate the presserfoot in conjunction with the vibratory movement of the needle-bar, or to permit said foot to receive simply a vertical movement when the needle is operating with one looper only, I prefer to arrange the cam a loosely upon the driving-shaft 0, Figs. 3 and 4, and provide said cam with an aperture, as at k, or other engaging portion, adapted to be engaged by a pin or projection 10' on a clutch or sliding sleeve K. This sleeve may have a key-andgroove connection with the driving-shaft, so as to slide thereon and rotate therewith, and may be operated by a lever, as at 10 Fig. 1, pivoted to the overhanging arm B and engaging the sleeve with its upper end in the usual manner for operating a slidable and rotatable sleeve. A slot, as at 10 may be provided in the sleeve, adapted to register with the lower end of a screw, bolt, or projection k depending fromthe overhanging arm, Fig. 4, so that said sleeve and shaft must be broughtto a predetermined position before the lever 10 can be operated. In this case the slot is arranged so that when' the needle and the presser-foot are raised and the tooth e on the stop-wheel is in position to engage the sliding bar E the slot will register with thfiower end of the screw 70 and will permit the sleeve K to engage or be disengaged from the cam c I to permit said cam to rotate .with the shaft or to remain stationary, the lower end of the screw being adapted to engage either side of the flange of said sleeve when the slot does not register therewith, thereby holding it from a sliding movement along the drivingshaft. I I

On the opposite end of the cam c is a bevel-gear 70 secured to or formed integrally therewith, adapted to mesh with a bevel-gear m, secured to a shaft m. This shaft maybe supported in a bracket secured to the overhanging arm B and may have a cam m sc cured thereon and adapted to engage or contact with .a lever m or a roller arranged on a stud projecting from the lever, said lever being normally pressed toward or against the cam m by a suitable spring m A link or connecting-rod m may connect the lever m to a stud or arm on, secured to the presserbar, so that as the cam m rotates the lever m will be engaged thereby, so as to vibrate or partially rotate the presser bar and foot in one direction, and when the cam passes the lever the spring m will return the lever to its normal position, so as to vibrate the presserfoot in the opposite direction. It will thus be seen that a presser-foot having a single aperture therein may be vibrated to correspond with the movement of the needle and the needle and presser-foot vibrating mechanism simultaneously thrown into or out of connection with the driving-shaft C to permit the needle and presser-foot to operate alternately with the loopers or with one looper only.

The operation of my machine will be readily understood from the foregoing description, taken in connection with the accompanying drawings.

The machine is not provided with the usual feed, but the fabric is moved by the operator in whatever direction he may desire and to any distance required for the formation of a stitch of any desired length, the needle descending at the will of the operator when the fabric is adjusted by hand to receive the needle action at the proper point. If it is desired to take several stitches at any given point upon the fabric in hand for the purpose of firmly tying the thread or fastening it so that it will not unray'el, the clutch-operating lever is thrown downward, so as to cause the needle to operate with one looper alone for forming any desired number of stitches. The desired tie having been made at the point where the work begins, the lever is shifted so as to throw the sleeve K into engagement with the cam 0, thereby causing the needle to operate first with one looper and then the other, thus enabling the operator to shift the fabric between each stitch taken, thereby laying the silk from the needle down upon the ggiils. The needle descends and passes --through the presser-foot, which automatically rises and falls and vibrates with the needle, holding the fabric to the bed-plate just long enough for the stitch to be formed and rising to allow free movement of the fabric to the point at which it is desired to make the next stitch.

\Vhen the machine is being used to make but one stitch at a time, the lug on the stop wheel, by coming in contact with the sliding stop-bar, will prevent further rotation of the driving-shaft unless the sliding bar is moved so as to permit the dog or tooth on said stepwheel to escape, by bringing the notch in the bar into the path of motion of said lug, whereupon the stop-wheel will be released and it will make one revolution, but at the completion of its revolution the dog or tooth on the stop-wheel will again strike the stop-bar and the dog may be again allowed to escape, and so on for every stitch, it being necessary for the operator to press the heel or toe on the treadle, either of which motions will bring the notch on the locking-bar in position to permit the dog on the stop-wheel to escape for another stitch and stop.

Ordinarily the machine stops at the completion of each stitch, the pressure on the treadle for starting the machine being made alternately by the heel and toe pressing upon the treadle; but if the treadle is held by the feet in proper position, usually horizontally, the machine will not stop, but will continue to form stitches, the needle action being performed alternately with one looper and then the other. The action of the needle is substantially the same as in my before-mentioned applications. The needle descending has the thread carried thereby engaged by the engaging end of the hook of one of the loopers, which,by means of the rotary motion imparted thereto through shaft D and counter-shaft will carry the loop, and when it is adjacent to or passes just beyond the projection 7t on the bobbin-casing will begin to shed or cast off the same, so as to pass over said casing and be locked by the looper or bobbin-thread, the loop passing over and past the lip h so as to complete the stitch. The machine may then be stopped, as heretofore explained, and the fabric moved to a position for forming the next stitch, the needle and presser-foot having been shifted by the needle-bar and presser-foot vibrating mechanism, so as to perform their usual function in conjunction with the other looper in a similar manner, and, as will be seen, the looper-thread of the adjoining looper being left free to be automatically taken up by the recoil of the spring acting on the bobbin thereof when the stitch has been formed by the cooperation of the active looper and needle and the material moved to bring the adjoining looper again into action.

Usually after making the first tie itis only necessary to make a single stitch at each revolution of the needle-driving shaft, operating alternately with first one looper and then the other; but of course by shifting the clutchoperating lever k two or more stitches may be formed with either looper and needle without moving the cloth or fabric, so as to draw out the looper-thread and form a long stitch on the under side. lVhen the material is moved, the clutch should be engaged, so as to permit the thread paid out by the looper which has formed the previous stitch to be taken up after the next stitch is made by the other looper. Upon the completion of the desired figure or design the clutch-operating lever may be shifted 'so as to disengage the clutch, and thereupon a number of stitches may be made with whichever looper the needle may be operating at the time, so as to tie or tack the goods on the finishing strokes.

Thus by causing a single needle to operate alternately with two or more loopers the underlying thread, which is drawn out by the operator in moving the goods the desired distance to form a stitch of any desired length,

worked, are formed on the under side of the cloth, whereby greater security and perma-.

nency are given to the work, a saving of thread is effected, and the cost of production of the decorative or ornamental effect is reduced.

The process of unwinding the thread from the bobbin against the spring-pressure is performed, of course, by the act of the operator in shifting the goods from one point to another. by hand, thus enabling the operator to lay out any design or sketch which may suit his fancy or seem to be proper for the work in hand, and'after the second stitch is taken each movement of the garment underneath the presser-foot permits one bobbin-spring by its recoil to wind up the thread while the thread upon the other bobbin is unwound. For the purpose of adjusting the spring h so as to vary the tension thereof on the underlying thread, I may provide an independent arborn, Figs. 19 to 22, inclusive, instead of forming the same integrally or perma nently securing said arbor to the face-plate of the bobbin-casing. This arbor may have a lower recess adapted to fit over a boss '12 on the face-plate of the bobbin-casing, so as to permit it to be rotated thereon, and may have a lower flange n adapted to form the lower support for the friction-disk, one end of the spring h being securedto said flange and the other end of said spring secured to or connected to the friction-disk, as heretofore explained. The upper end of the arbor n may have a screw-threaded recess in which a hollow or tubular screw-threaded stem n is adapted to be rigidly secured, said stem having a head of any desired form adapted to rotatably confine the sleeve or hub of the fric tion-disk between the flange n of the arbor and said head. A screw or bolt n has its head fitting the tubular or hollow portion of the stem n and has its screw-threaded end engaging a threaded aperture or recess in the boss n on the face-plate of the bobbin-casing, so as to rigidly hold-the arbor against said plate.

The lower surface of the flange 11. may be provided with a series of apertures n adapt-' ed to engage a pin or projection n on the faceplate, so that by giving the screw n a couple of turns, so as to partially remove the same from the boss n, the arbor and flange may be raised sufficiently to be disengaged from the projection n and said arbor rotated independently of the bobbin-casing, thereby adjusting the spring to any desired tension. When the spring is properly adjusted, one of the apertures of the arbor may be caused to en a e the in or ro'ection n and the screw b C:

n tightened, thus holding the arbor and bobbin-casing rigidly together. It will be understood that the arbor might have the pin or projection and the apertures be arranged in the face-place, that other means may be employed for adjustably securing the arbor to the bobbin-casing and that the face-plate, when desired, may be independent of the bobbin-casing instead of being formed integrally therewith.

While the machine is especially designed for flossing it is also adapted to be used for various other purposes and may be profitably applied to the manufacture of draperies, curtains, tapestries, piano-covers, handkerchiefs, infants clothing, suspenders, tablecovers, mats, corsets, &c., being adapted to be used in the manufacture of corsets to stay or tack the ends of stays and at the same time leave long stitches of silk or other thread on the surface for a beautifying effect, the design to be determined by the operator. Among other advantages the avoidance of the formation of long stitches on the under side of the cloth permits the use of silk for the needle and of ordinary thread for the loopers, but'it will be understood, of course, that silk or other thread may be used with the loopers when desired.

Handsome'needlework neatly and artistically accomplished in appropriate designs and colors is a desirable form of ornamentation of textile fabrics, and such designs may be easily and effectually produced by this machine. It is to be understood, however, that the adjustment for the take-up spring may be used on other forms of loopers, that various changes may be made, and that some of the parts may be dispensed with and others substituted therefor without departing from the spirit of my invention.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent of the United States, is

1. In a sewing-machine, the combination with two loopers and mechanism for operating the same, of a needle-bar provided with a single needle, means for vertically reciprocating said bar, mechanism for imparting a partial rotation to the needle-bar when the needle is lifted so as to adapt the needle to descend for operation first with one looper means for raising and lowering said foot, together with mechanism for imparting a vibratory movement to the presser-foot while the latter is raised so as to correspond to the vibratory or rotary movement of the needle, substantially as described.

2. A sewing-machine having a single needle and two loopers, means for actuating the needle and loopers and means for automatically shifting the needle so that it shall operate alternately with the two loopers, a presserfoot and means for raising and lowering said foot, mechanism for imparting a vibratory movement to the presser-foot while the latter and then with the other, a presser-foot, and

is raised, and means for causing the needle 1 and presser-foot to operate at will with one looper only, substantially as described.

3. A sewing-machine having two loopers and a needle-bar provided with a single needle, a main driving-shaft for actuating the needle-bar, and a looper driving-shaft c011- nected with and receiving motion from said main driving-shaft, mechanism for imparting a partial rotation to the needle-bar each time the needle is lifted so as to adapt the needle to descend and operate alternately with the two loopers, a bar provided with a presserfoot, means for raising and lowering said bar, a cam operated by the main driving-shaft, a lever adapted to be actuated by the cam when the latter is rotated, and connections between the lever and the presser-foot bar so as to vibrate the latter while in a raised position,

substantially as described.

.4. In a sewing-machine, the combination with a needle-bar and a driving-shaft for actuating said bar, a bar having a presser-foot secured thereto, means for raising and lowercam so that said lever will be operated in one direction by the cam and in the other by the spring, together with a link or rod connected at one end to the lever and at the other end to a stud or projecting arm on the presserfoot bar so as to vibrate the latter when the cam is rotated, substantially as described.

5. A sewing-machine having two loopers and a needle-bar provided with a single needle, a driving-shaft for actuating said bar, means connected to the driving-shaft for actuating the loopers, mechanism for imparting a partial rotation to the needle-bar when the needle is lifted so as to adapt the needle to descend for operation first with one looper and then with the other, a presser-foot and means for raising and lowering said foot, mechanism for imparting a vibratory movement to the presser-foot while the latter is raised, together with a clutch device for simultaneously throwing the needle-bar and prcsser-foot vibratory mechanisms into or out of gear with the driving-shaft so that said needle-bar and presser-foot may operate alternately with the two loopers or with one looper only, substantially as described.

6. The combination with a reciprocating needle-bar and means for imparting motion thereto,-of a vertically-movable presser-foot and means for raising the same each time the needle is lifted, a stop-wheel fast on the main driving-shaft and provided with a peripheral lug or tooth, a wheel loose on said shaft but in frictional engagement with said stop-wheel and adapted to be continuously rotated, a slidin g bar provided with a notch or recess adapted to be thrown across the path of movement of said lug to permit the uninterrupted passage of the lug for continuous motion, and a vertically-movable cam-bar provided with a cam-slot engaging a portion of the slidingbar for shifting said sliding bar so as to cause the same when operated to engage the tooth on the stop-wheel and stop the main drivingshaft at each complete revolution, with the needle and the presser-foot lifted, substantially as described.

7. A sewing-machine looper, comprising a casing having a loop-engaging end or point, a stationary bobbin-casing arranged in said looper-casing so as to permit the latter to revolve around said bobbin-casing, a rotary bobbin arranged in the bobbin-casing, and a spring arranged to yieldingly resist the rotation of said bobbin and to reverse its motion so as to rewind the unused bobbin-thread when the pull upon the latter is released, substantially as described.

8. A sewing-machine looper, comprising a casing having a loop-engaging end or point, a bobbin-casing arranged in the looper-casing and provided with a lip or projection adapted to engage a portion of the machine so as to permit the looper-casing to revolve around said bobbin-casin g, a rotary bobbin arranged in the bobbin-casing, tensioning devices, and a spring arranged to yieldingly resist the rotation of said bobbin and to reverse its motion so as to rewind the unused bobbin-thread when the pull upon the latter is released, substantially as described.

9. A sewing-machine looper comprising a casing having a loop-engaging end, a removable bottom plate provided with an upwardly-projecting lip under said loop-engaging end, a bobbin-casing arranged in the looper-casing and provided with a projection or lip adapted to engage a portion of the machine so as to permit the looper-casing to revolve around said bobbin-casing, a rotary bobbin arranged in the latter casing, tcnsioning devices, and a spring arranged to yieldingly resist the rotation of said bobbin and to reverse its motion so as to rewind the unused bobbin-thread when the pull upon the latteris released, substantially as described.

10. A rotating looper comprising a casing provided with a loop-engaging end or point, a bobbin-casing arranged in the looper-casing and provided with a projection or lip adapted to engage a portion of the machine so as to permit the looper-casing to revolve around said bobbin-casing, and a rotary bobbin arranged in latter casing; said casing being provided with a spindle or arbor projecting from the lower face thereof, a disk journaled on said arbor, tension devices arranged in the arbor in engagement with the disk and bobbin, and a spring adapted to yieldingly oppose the rotation of the disk and to restore it to its normal position when moved against the opposing force of the spring, substantially as described.

11. A sewing-machine looper comprising a casing, a rotary bobbin, means adapted to engage the needle-thread, a spring arranged to IIO yieldingly resist the rotation of said bobbin and to reverse its motion so as to rewind the unused bobbin-thread when the pull upon the latter is released, and means for adjusting the tension of said spring, substantially as described.

12. A sewing-machine looper comprising a casing, means adapted to engage the needlethread, an arbor independent of the casing, a rotatable disk, a rotary bobbin, tensioning devices therefor, a spring having one end secured to the arbor and its other end to the rotatable disk, so as to yieldingly resist the rotation of said disk and to reverse its motion when the pull upon the bobbin-thread is released, and means for adj ustably securing the arbor to the casing to permit the tension on said spring to be varied, substantially as described.

13. A sewing-machine looper comprising a casing having aloop-engaging end or point, a

bobbin-casing arranged in said looper-casing so as to permit the latter to revolve around said bobbin-casing, an arbor independent of the bobbin-casing, a rotatable disk arranged on the arbor, a rotary bobbin arranged on said disk, tensioning devices therefor, a spring having one end secured to the arbor and its other end to the rotatable disk so as to yieldingly resist the rotation of said disk and to reverse its motion so as to rewind the unused bobbin-thread when the pull upon the latter is released, means for permitting the rotary adjustment of the arbor, and a screw for holding the arbor and bobbin-casing together, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

GEORGE E. COLLEY. Witnesses:

SAM. W. WINCHESTER, THEO. J. CAMP.

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