US1016226A - Thread-cutting mechanism for sewing-machines. - Google Patents

Description

D. MILLS. THREAD CUTTING MEOHANISM FOR SEWING MACHINES.

Patented Jan. 30, 1912.

10 SHEETS-SHEET 1.

D. MILLS.

\ THREAD CUTTING MEGIIANISM EON SEWING MACHINES.

APPLICATION FILED MAY 23`y 1902.

1,016,226. Patented 13.11.30, 1912.

10 SHEETS-SHEET 2.

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THREAD CUTTING MBGHANISM Pon SEWING' MACHINES. I APPLIATION FILED HAY 23, 1 902. l

Patented Jan 30, 1912.

`Witnessesr 10 SHEETS-SHEET 3.

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D. MILLS..

THBEADOUTTING MEGHANISM FOB, SEWING MACHINES. APPLIOATIOI IILEDMAY 23, 1902.

1,016,226. Patented. Ja,-1L.3o, 1912 10 SHSETB-SHEET 4.

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Y D. MILLS. I THREAD CUTTING MEGHANISM FOR SEWING MACHINES.

APPLICATION FILED MAY 23. 1902. l 1,01 6,226. Patented Jan. so, 1912.

10 SHEETS-SHEET 5.

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l ttor/uy y 1)..MILLS.v THREAD CUTTING MEGHANISMI'OR SEWING MAGHINES..

APPLICATION FILED MAY 23,v 1902..

. 91M 6. w. ,m .m m B m m n m IHAR w Wll@ y 6. y Mw 2 e 2 l 6, 0, .L 1 w @0% D. MILLS. THREAD CUTTING MECHANISNI POB. SEWING MACHINES.

APPLICATION FILED MAY Z3, 1902. l

1,016,226. I Patenea Jan. 30, 1912.

10 SHEETS-SHEET 7.

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www@ l iter/2W D. MILLS. THREAD G UTTINGMBOHANISM Pon SEWING MACHINES. APPLICATION FILED MAY 23, 1902.

1,016,226, Patented Jan. 30,1912' 10 SHEETS-SHEET 8.

D. MILLS. THREAD CUTTING MEGHANISM FOR SEWING MACHINES.

APPLICATION FILED MAY 23, 1902.

Patented Jan. 30, 1912.

1o SHEETS-SHEET 9.

EN, Rmx a @x A TTOHNEY WITNESSES:

-D. MILLS. THREAD GUTTING MEGHANISM PQR SEWING MACHINES.

APPLICATION FILED MAY 23. 1902.

Patented @11.30, 1912.

10 SHEETS-SHEET 10.

UNITED STATES PATENT oEEIcE.

DANIEL MILLS, 0F PHILADELPHIA, PENNSYLVANIA, ASSIG'NOR TO STANDARD SEW- ING MACHINE COMPANY, 0F CLEVELAND, OHIO, A CORPORATION OF OHIO.

THREAD-CUTTING MECHANISM FOR SEWING-MACHINES.

Specification of Letters Patent.

Application led May 23, 1902. Serial No. 108,667. i

To. all whom t may concern.' Be it known that I, DANIEL M1LLs, a citizen of the United States, residing at Philadelphia, Pennsylvania, have invented new which the desired number of stitches are` sewed at one point in the work, as at a button or buttonhole, and the machine then stopped and the Work shifted before reing in this manner, as for example, in a but- Lton-sewing machine, which is the type of machine shown in the drawings of thisA application to illustrate my invention, a button is sewed to the fabric, the machine stopped, and the work then drawn through the machine to locate the fabric atanother point at which another button maybe sewed to the same. In such machines as heretofore constructed the needle andthe bobbin threads are usually both pulled or drawn along with the fabric as the latter is shifted, and there is consequentlymuch waste of thread thereby caused, as the thread is continuous, spanning the space from button to button, and is usually cut by the operator after the sewing on of the buttons is completed. This cutting operation of course causes a considerable loss of time in addition to the waste of thread.

The principal objectv of my invention is to avoid the waste of thread and loss of time incident to the use of this type of sewing machine, and I accomplish this by cutting the needle and bobbin threads after the sewing mechanism has made the desired 'number of stitches at a given point and has been automatically stopped, this cutting of the threads being performed by a suitable thread-cutter brought into action before the work is shifted to a new position, andpreferably taking place simultaneously with the operation of theparts in releasing the workv by its holder or presser. Before this cutting operation takes place it is necessary that a sufficient length or quantity of thread be pulled from the needle and bobbin thread supplies to allow for the proper formation `Patenwl Jan..3o,19`12.

of the first stitch when the machine is restarted, and to do this, I provide means for operating tothis end whlch are preferably automatically broughtinto action onl dur'- ing the formation of the last stitch ofy a determined number, such means, in the case of the needle thread, operating to receive and detain thel last loop cast oil' by the looper in a manner wherebythe usual take-up will be caused to draw from the needleV thread supply the additional length or quantlty required. Owing to the variation in the normal mode of pulling off and taking up the thread, which results from the pulling off of the eXtra quantity of needle thread durling the formation of the last stitch toleave a cut end of considerable length, I also prov vide, in connection with means for normally tensioning said thread 1n the ordinary manner, means for releasing the tension at the v ,properpoint when this eXtra length of the needle thread is being pulled ol, the parts being sonorganized as to 'cause the needle thread to be' put under tension again just before the stopping of the machine, in order.

that the thread may be located with precision, held taut, and cut'readily.

Another important object of the invention is to provide for lthe positive and automatic interlocking of the needle and bobbin threads as soon as the machine is re-started, and I accomplish this, and prevent loss of time, which would result if the operator were obliged to locate and grasp the cut end of the needle thread, by providing an'automatic gripping device which will engage and holdthe loose end of the needle thread loop` so as to insure its positive interlocking with the bobbin thread and form a stitch immediately after theemachine has re-started.

Other objects and advantages ofthe invention `,not hereinbefore referred to, but which willL be hereinafter described, are illltistlated in the accompanying drawings, in w 1c Figurel is a front elevation, partly in section, of 'a Standard button-sewing machine having my invention applied thereto. Fig. 2 is a rear view of the same,

with parts broken away to illustrate the construction more clearly. Fig. 3 is a'plan of the same. Fig. 4 is an under side view of the same, with a part of the switch-cam broken away. Fig. 5 is -an end elevation of the machine viewed from `theleft in Fig. 31. Fig.- 6i's a vertical section 'of the same, the section being taken substantially'on the line the bed-plate vand certain adjacent parts showing the button-holding and other devices. j Fig. 8 is an'enlarged sectional. front v elevation illustrating .the o ration of the variousparts of the stitchorming mechanism and a thread-gripper'coperative therewith. Figs. 9 and 10 are enlarged sectional end elevations of the stitch-forming devices and of -aloop-detainer andl spreader 'cooperative therewith', showin the respective ositionsof 's aid-detainer 'an spreader when 1t is out of. action and when in its Aoperative position. Figa 11and 12 are enlarged sec'- tional plans illustrating the bobbin-thread Vpull-ofi' and thecutting device at different points inftheir paths of action. Figs. y13

l and 714 are perspectivelviews illustrating .the manner in which the bobbin-threadis pulled of and both threads placed inputting position' while the needle thread loop is spread by the combined thread detainer and spreader.' Figs. 15 and 16 are perspective views illustratin different positions of a .thread-gripper or ,gripping and .holding the Acut, end ofthe needle thread. Fig .-17

`is an enlarged sectional'detail through line 17e-17- of Fig. V14, illustratin the positions of the bobbin-thread pull-o andcutter at the time the cutting operation takes place.

lSimilar characters designate like all the figures .of the drawin 'V- In said drawings, I have illustrated one well-known construction .and are for contype. of sewing machine, in lwhich the stitchforminlg mechanism is adapted to be. automatica mined number of stitches, the machine shown being abutton-sewing machine of the" well-known Standard sewing machine.

type, although my invention is equally appllcable to othersewingmachines for other` purposes than sewing onlbuttons. Many of the parts ofthe machine illustrated are of venience of illustration substantially as found insa'id Standard sewing machine, some of saidv parts being a bed-plate 1, an overhangiigjann 2, an upper drlving shaft 3 suppor in bearings 1n said arm 2, a

. vertically-reciprocating needle-bar 4 oper- I A' shaft 6 supported in suitable bearings' ated from the driving shaft 3,' a rotary4 shuttle or loope'r- -5, a shuttle-driving on 'the under side of the bed-plate and olperated from the upper shaft 3 by sultab e connections, a. take-up device 7,

parte y stopped after making a ldeteroperated in the usual manner from the upper presser-bar. between a pair lof nuts `10-10, 4

said button-holder having the usual buttongripping jaws 13-.13, between which a vbutton b may be firmly held. v

The button-holder may be vibrated back and forth t0 present first one and then an-l /other of a' pair of holes in y the button in' aj position to be entered by the needle in the following manner. The presser-bar, to

which the`button-holder. is secured', is"piv lotally mounted at its end in the arm of the machine and is vibrated back and forth in a direction transverse to the bed-plate by the usual operating connections employed .in this machine, andas said presser-bar is vibrated, the button-holder, and the button carried thereby, are also moved hackV and forth to present-a pair of holes in the'button to the needlealternately.V The button-holder is also pivoted to swing relatively to the' presser-bar about the pivot 12 for the purpose of presenting th'e second pair of holes in the button in position to be entered-by .A

the needle. This swinging movement may be communicated to the button-holder--by a Vconnef'zting-rod 28 adjustably secured to the 'rocker-arm or lever-arm 27 attached to the 'upper en d of a short vertical shaft 25 extendig throughthe bed-plate and working ,inI be rings. at opposite sides thereof, and is derived from a rotary switch-cam 24 .through another Aarm 29,- which latter is secured to the lower end of the shaft 2 5' and provided with a' pin which works in the groove 24", see dotted' lines, Fig. y3, of said cam and causes the shifting of the connecting-rod 28 and the buttonholder at the proper timef This cam is geared iirectly Worm gearing.

Any suita le automatic stop-mechanism may be employed for stopping the machine after makingv a predetermined number of stitches, a desirable form being thatshown and described in myY prior vPatent No. 635,267, dated October 17, 1899. In the present case, as in said patent, the` shaft 3 has the usual hand-wheel or pulley 34 fast thereon and a driving or loose pulley 35 to the shaft 6 and driven therefrom by adapted to be clutched to, and unclutched from, said fast pulley 34. vFor the purpose of coupling these pulleys an elbow-lever 36 is pivoted on a bracket-arm 37, and one end of this elbow-lever extends into an opening in a vertically operating slide-bar 39 and is adapted to be actuated thereby. The other or outer end of said elbow-lever extends into position to actuate a sliding pin 40 controlling the clutch movement of the pulley 35.' At its lower end the said slide-bar 39 is connected by a link 42 to ,a lever 43, one end of which` latter is pivoted on a lug-44, while the opposite end of said lever is bifurcated and embraces 'a pin projecting from a rock-arm 45 carried by a rockshaft 46 suitably supported below the bedplate, said rock-shaft having near its forward end'another arm 48, preferably a cam arm, for controlling the operation of a loop detainer and spreader hereinafter to be de- `scribed. This shaft 46 is rocked in the proper direction whenever it is desired to couple the pulleys 34 and 35, and when the pulleys are clutched together the elbowlever 36 and the slide-bar 39 are held in .position to effect such clutching by la suit-able latch, such as the horizontally acting Aspring-pressed slide-latch 49, engaging with the said slide-bar. .By withdrawing the slide-latch 49 from engagement with the slide-bar 39` the latter will be automatically .elevated and the other parts returned to a position to release the loose pulley 35 from the fast pulley 34, a spring 54 being employed to effect this return movement. The fast pulley has two stop- rings 57 and 58 yieldlngly connected therewith, in a Inanner as fullydisclosed in my said prior patent. These stop rings are each provided with a projecting lip or stop-face, one of which, that on the ring 58, being adapted to strike vthe upper end of the slide-bar 39 when the latter is released by the .sli-delatch and forced upward by the spring 54, so as to stop rotation of the pulley in one direction, while the ring 57 may have aslight over rotation due to the momentum ofthe connected operating parts, in which event it will be returned to the normal stopl'. ping point by a spring (not shown) and v stopped in the proper position by the engagement of its aforesaid stop-face witha stop-lever 63, this stop-lever having an eX- tension 64 in contact with the under side' of the lower arm of the elbow-lever '36, against which latter it is normally held a spring (not shown.) so as to be movable therewith. Hence when the slide-bar 39 is raised into operative position to effect the stopping of the machine, the stop-lever'63 riseswith it into its operative position, and when the slide-bar is moved downward to permit the re-starting of the machine, it positively carries the said stop-lever with it.l

- The stop-mechanism is intended tobe controlled automatically, and I have shown herein a releasing-bar pivoted to the lever-arm 27 and having a hooked rear end.

for engaging and releasing an elbow-lever 74 and also having a cam face for shift-ing the position of the hooked end of said bar. The hooked end of the bar 70 does not operate the lever 74 to automatically stop the' tion is automatically stopped by t-he partsy previously described.

In myvimproved machine the automatic stop mechanism is intended to control the throwing into action of a device for engaging with and detaining t-he 'last loop cast off by the shuttle in a determined number of stitches and for spreading said loop in a desired position to permit the cutting of one side thereof without cutting the other. This device I term a loop-detainer or loop-detainer and spreader. mally held out of action and is only brought into operation just prior to the casting off of the last loop by the shuttle prior to the automatic stopping of the machine. I employ in the present instance an oscillatory loop-detainer, designated generally by 75, which comprises a swinging arm of peculiar construction secured to the forward end of a shortrock-shaft 70 which is journaled in bearings below the main sha-ft 6 and having at its rear end another' rock-arm 7l carrying" an anti-friction roller 72, the latter being normally engagedl by the cam arm 48 of the rock-shaft 46 during the sewing` operation of the machine andheld thereby with theloop-detainervin an inoperative position relative to the shut-tlc, as shown in Fig. 9. The

operations of the parts are so timed that the loop-detainer is not released by the cam-arm 48 until the last loop'of the series of stitches is cast olf by the hook of the shuttle 5, and

this movement of the arm 48 will take place just before the slide-bar 39 is released by Said device is northe slide-latch 49, as 'hereinbefore described.

The loop detainer land spreader preferably has a hook 76 forming a recess 747 in which the needle-threaddoop may be received, and Isaid detainer may also have a spreader, prefer'ably in the form of a lateral wing-or flange 78, for deflecting the two sides of the loop away from a common path and spreading them a considerable distance apart, the object of this being to enable the cutter hereafter described to cut one side ofthe loop thread without severing the other. The

hooked portion of the loop detainer preferably forms a guide for the loop, as shown .in Fig. 10, and it may be stopped in its .clearly shown in Figs. 13 and 14.' Owing to the fact thatthis last loop of a series is detained and not drawn up into the work by the take-up, it is necessary to provide means for releasing the tension on the needle-thread by the time the loop reaches the position shown in Fig. 10.

Any ordinary type of tension device, such as 85, which in this case comprises two plates or disks held together by spring pressure, may be employed for tensioning the thread, and in connection therewith a tension-releasing-device may be used which will operate immediately after the slack in the loop,

shown in Fig. 10, is taken up by the take-up device 7. In order to accomplish this release of the tension the *disks of the tension device 85 are preferably spread apart by the wedge-shape end 86 of a long tension-releasing lever 87 pivoted on the side of the overhanging arm 2. This lever has at its rear end a pivotal connection with a link 88, the lower end of which in turn is pivoted to a shiftable intermediate or plate 89, pivoted at 90 ona stud on the framework and havingv near its lower end a slot.in which works a pin 92, secured to the slide-bar 39 (see Figs. 1 and 6). At its upper end said plate has an anti-friction roll 93, which,

when the pin 92 holds the plate in its lower-A most position, is normally held out of the path of a cam 94-in fixed relation with the upper shaft 3. When the slide-bar'39 is released and rises, however, the pin 92 permits the roll 93 to be carried by a spring 94 into operative relation with the circular face of the cam 94, and at the same time said pin permits the lever 87 and its wedge-shaped end 86 to move to the position shown in Fig. 1. The antifriction ,roll 93 prevents the separation of the disks of the tension device until said rollis near the center of the fiattened .cam-face 94 of the cam 94, lwhen the Y wedge 86 will be permitted to enter between and separate said disks long enough to permit the take-up device 7 -to move upward a considerable distance' and pull oil' thread from the spool. Before the take-up reaches the limit of its upward movement, however, the roll 93 should ride away from the center of the attened cam-face 94 to cause the vwithdrawal of the wedge 86 and the re-tensioning of the needle thread, the movements of the parts being so timed and of such extent that after the re-tensioning of the thread the take-up 7 will rise a short distance, usually to the limit of its upward movement, and put the thread of the last loop cast .off by the shuttle under its normal tension to hold such thread taut during the cutting thereof.

In all of the principal views the mechanism is shown with the parts in the positions they occupy immediately after the machine has been brought `toa stop by the action ,of the stop mechanism. All of the parts are now in position' to permit the cutting of the needle and bobbin threads and the release of the work from the button-holder. In the foregoing description I have set forth the manner in which the needle thread loop is held bythe loop-detainer, andthus kept again automatically. It is also important to leave a suiiicient length of thread at the "cut end of the bobbin thread -for the same purpose. For this reason Imake use of a suitable bobbin-thread deflector or detainer in the form of a pull-oli which is coperative with the needle-thread deflector, or combined detainer and spreader, said pull-olf for the bobbin-thread being preferably associated, and movable, directly with a thread-cutter, preferably so constructed as to be capable of severing both the needle-thread and the bobbin-thread.

-In this construction (see Figs. 11-14 in-A clusive) the bobbin-thread pull-oli' 100 is pivoted at'a suitable fixed point 100a on the under side oft-he throat-plate and at its working end is so shaped as to forma notch or recess 101, constituting the pulloii' proper, the path of movement of this linger being such as to cause the walls of the recess 101v to engage the bobbin-thread 102 when'a working stroke is imparted to such finger, and to carry such thread toward the rear ofthe machine and form a blght or loop by pulling olf an additional quantity lof thread from the bobbin, and

thereby provide a s uiicient amount of thread `to form an end of considerable length when such thread is cut.

Any suitable form of thread-cutting device may coperate with the parts just described to` sever the needle and bobbin threads. In this, case a movable shear or blade 105 is secured to the pull-olf device 100 with 'the cutting edge thereof extending across, and immediately in advance of, the back wall'of a s lot in the pull-off finger, which slot is indicated at 106, a coperating fixed shear or knife-edge 106', which in this casefis the edge of a plate 1061 secured to the under side o f the throat-plate, being located in the path of the movable shear 105, against which fixed shear edge the bobbin-thread 102 and one side 107 of the loop formed in the 'needle-thread may be cut. The two sides 107 and I108 of the loop are kept apart by the spreader 78, as shownA in Fig. 13, and as the pull-off device 100 moves to the position shown in Figs. 12 and 14, 'it receives the bobbin-thread in the recess 101 and pulls olf an extra quantity of thread from the bobbin. During this movement of the pull-off device 100 the side 107 of the 'loop inthe needlethread enters the slot 106, but the other side 108 of the loop is held clear of the inner 15 edge 109 of the pull-off device 100 and does not enter. the slot 106. The side 108 of the loop is therefore out Aof the path of the movable'shea 105 and is not cut by it, and hence a long end depends through the open- '20 ing in the throat-plate on the drawing up of the needle, this end being of sufficient `length to permit the formation of a loop on the next descent of the needle, the loose end of said thread being preferably gripped and held automatically after the hook of the shuttle begins to pull out such loop in the usual manner.

The parts just described for cutting the threads may be operated in any suitable way, butr I prefer to organize them in such a .manner that they will coperate with the presser-bar and presser-foot,which latter in' .,this'case is a part of the button-holder, this mode of organizing the parts being desirable' in order that the operator may cut the threads and raise the button-holder from the work, into aposition where the button may be disengaged from the holder and the work shifted, by a single operation. Here, the

40 angular bobbin-thread pull-off .has on its under side apivoted squared guide 110, which works in' the forked end of a rock-lever 112,v

pivoted on the under side of the bed-plate and operated by a long-connecting-rod or l oted to the lower end of a long guide-arm 114, pivoted near the rear end of the lforward side of the overhanging arm 2,' a suitable spring 115 serving to return these parts to their normal positions withthe cutter and the pull-ofLout of the path of the threads. Near its lower end a link 116 connects the long guide-arm 114 to a short rock-arm 117 fastened to the forward end of a rock-shaft 118 which passes through and isjournaled in theheadof the machine near` the lower.v end thereof, and has' at the rear side of the machine` a rock-arm 119, carrying a springpressed by-pass pawl 120 having .an oblique face the path of an anti-friction roll 121 on 4the rod 30by means of which latter the presser-bar may be raised 'on' .the depression of a treadle (notvshown) bythe operator. .At 'its upper end the connecting-rod 30l has a l slot 122 of considerable length, so as topropull-wire 113, the rear end of which is pivposition, in addition to that which is shown at 125 for lowering the presser-bar and its lever. l

'After the threads have been cut and the 7 5 work shifted to a new position the threadcutter and pull-olf may be returned to their normal positions and the presser-bar and button-holder lowered again into engagement with -the work. Thereupon, the machine may be started again by turning the rock-shaft 46 by a suitable connection with the rock-arm 48, which will cause the elbowlever 36 to be operated and the pulley 35 to be `clutched to the pulley 34 again, and at the 85 same time ,the slide-bar and the stop-lever will be withdrawn from engagement with. the lips on the stop-rings, and the intermediate or plate' v89 lowered to carry the antifriction roll 93 away from the cam 94... kThis -90 machine the construction and operation of 10.0 A the gripping means vshown herein will' now b`e-described. The switch-cam 24 hereinbe fore referred Ito makes one complete rotation for each complete cycle of operations of the machine, and for this reasonsaid 'cam also -1"054 preferably has a peripheral cam face 130 controlling the operation of the gripping device. Inthis construction one arm-of an angle-lever, which arm -is designated by 131,

'has an anti-friction roll 132 in-contact with 110 the periphery of said switch-cam, and the other arm 133 of said angle-lever has a loose pin-and-slot connection` (formed by a long slot 133 and avpin 134) with a "slide 135 operating ina suitable way in the bed-plate and having at its forward end a gripping. finger 136 adapted to catch the rear side of l the loop thrown out by the needle', as shown in Figi 15, and. grip the same between it and theunder side ofthe'edge of the .opening 120.V 137 in the throat-plate through which the needle passes, as shown in Fig; 16, the gripping finger' preferably advancing and with-l drawing a short distance to alternately grip land release the thread atea'oh 'turn of the A1:25

shaft .6. The ,reason for this is that at the beginning of the sewing operation the antifrictionvroll 132 rides down the cam-face and permits the slide 135, which is normally in an inoperative position, to be shift- 130 ed to an operative position, said "slide having 'in this 'case a stud 140 depending therefrom and carrying an anti-friction roll 141 normally out -of the path of a circular face-cam 142cm the shaft 6, this---roll being shifted,-

however, into engagement with said face by means of a suitable spring, such as 143, and held against saidface 142 at all points in the circuit thereof. Hence, the roll 141and' the 10 gripping nger 136 connected therewith.are

reciprocated back and forthat each stitch-t forming operation 4during the formation of the first few stitches, and this action continues until the switch-cam 24 `turns far enough to cause the roller 132 and its anglelever to be shifted'again towithdraw vthe roll 141 awayrom the cam-face? 142 to its inoperative position. -As an important feature in the operation of this vthread-gripping device, the latter is so controlled by the peripheral cam-face of the switch-cam 24 as not to come into operation until the second descent of the needle. This permits the loose always be located on the under 'sidev of the work.

1. In a sewing machine, the combination with stitchforming mechanism embodying a needle and a bobbin,"of an automatic stopmechanism, a detainer for the' needle'thread operative'to engage the thread beneath the 40 work plate, controlling connections between said needle thread detainer and said' stop mechanism, an independently controlled -detainer 'for the bobbm"thread, fa-nd a. thread cutter coperative with said detainers.-

.45 2. Inga sewing machine, Vv,tho 'c11bination-v with stitch-forming mechanism 'embodying a needle anda bobbin, of an automatic stop -mechamsm, two inde erdently acting thread detainers for controllmg the needle 'and bob-v 60 bin threads respectively, the needle thread detalner being voperative to engage the thread beneath the work-plate and being controlled by said stop mechanism, and the bobbin thread detaine bein operative subsequent to the stopping of te machine and,

- being manually controlled, anda thread cut` ter coperative with saiddetainers.

3.. In a sewing machine, the combination with stitch-formin mechanism embodying a needle and a bob in, of an automatic stop f v mechanism, a needle thread deflector engaging the threadbeneath the work plate, controlling connectionsbetween said deiector .and sald 'stop mechanism, an independently controlled deiector for the bobbin thread,

deflectors.

work upon the iirst descent ofi the needle and ath-read cuttercoiiperative with said 'I 4. In. a sewing machine, the combination with Stitch-forming mechanism embodying' a needle and a bobbin, of an automatic stop.

mechanism, twoindependently acting "thread defiectors for controllingI the Vneedle and bobbin threads respectively, the needle lthread deflector being operative to engage the thread beneath the work-plate and-being controlledby said stop-mechanism, andthe bobbin threaddeliector being operative subsequent to the stopping ofthe-'machine'and being manually controlled, and a thread cutter coperative with said deliectors.

1 "5. In a sewing machine, the combination with stitch-forming mechanism-v embodying a needle and a bobbin, of two'independently acting normally inoperative thread detain' ers for controlling the needle' and'bobbin threadjrespectivel'y, the needle thread def tainer being operative prior to the stopping of the machine and the bobbin thread de tainer being operative subsequent tothe stopping of the machine, an automaticde` stop, .mechanism for tainer controlling throwing' the needle Ythread detainer in to ac tion, anda thread` saiddetainers. a

.- 6. In a sewing machine, thecombination cutter coperative with with stitch-formingmechanism embodying a needle and a bobbin, of an automatic stop mechanism, a combined loop detamer and spreader and a bobbinthread detainer controlling the needle and bobbin threads re-l spectively, one of said detainers being con'- trolled by said stop mechanism independent of the other, and a thread cutter co erative with said loop detainer and sprea er and said bobbin thread detainer.

7. In asewing machine,'-'the comb by said stop mechanism and automatically vthrown into action thereby upon the vstopping of the machine, and a manually-controlled thread-cutter movablein the path of v v ationv with stitch-form`ing mechanism, of an automatic stopymechanism, a normally inoperative loop-detainer andspreader controlled I one side only of the loop and beingoperative subsequent 'to thefstopping of themaf-A 8. In a sewing 'machina'the combinationwith stitch-forming mechani'sm of an automatic stopmechan1sm,fanor mall `inoperative loop-detainer and-spreader or deflect'- -ing one side of the loop :away from the cutterl and being controlled by said stop lmechanism, and av thread-cutter movable inthe path of one side only of said loop. and vbeing supported' and operative independent of the loop-detainer and spreader.

.9; 'In a sewing machine, the combination with ystitch-forming mechanism, of a .takeup device .for the needle-thread, a thread cutter, a loop detainer, 'means for throwing *up device for the needle-thread, a thread cutter, a normally inoperative thread-detainer, an automatic stop-mechanism for throwing said detainer into action,'a tension device, and a tension-releasingdevice organizedy and timed to release the thread after the throwing of the detainerinto action and to retension the same prior to the completion of the take-up action.4 v

11. In a sewing machine, the combination with stitch-forming mechanism, of a normally inoperative loop detainer, an automatic mechanism for throwing said detainer into action, a thread cutter, a tension device, and a tension-releasing device organized and timed to release the thread moment-arily subsequent to the throwing 'of the detainer into action and thereafter retension the thread prior to the operation of the cutter.

lao

12. In a sewing machine, the combination with stitch-forming mechanism embodying a needle and a looper, of atake-up device for t-he needle thread, a` normally inoperative loop detainer,` an automatic stop mechanismv for throwing said loop detalner into actlon,- a tenslon releasing device organized, and

timed to release and retension the loopfduring the take-up movement after the throwing of the detainer into action, and a'thread cutter cooperative with said loop detainer;

13. In a sewing machine, the combination with stitch-forming mechanism embodying a needle and a looper, of a take-up. device, a

l normally inoperative loop detainer, an automatic stop mechanisnii'jfor" throwing said lloop detainer into action, a tension-releasing device organized and timed to release the .loop momentarily during part of the take-` up movement after the throwing of thel detainer into action and to retension said` threadbefore the end of said take-up .movement, and a thread cutter Acooperative with said loop detainer. f v

14:. In a sewing machine, in combination, stitch-forming mechanism, a thread gripper, means for reciprocating said gripper in unson with the stitch forming mechanism,

' means for rendering said gripper active after thel first reciprocation. of the needle at the'restartingcf the stitch-forming mechav nism, whereby the loose endxof-the needle thread is located, at the underside of the work; and mechanism forrendering the thread gripper inactive.

.15. In a sewlng machine, the combination v with stitch-forming mechanism embodying a needle and a bobbin, of an automatic stop mechanism, a loop detainer and spreader for engaging the needle thread, a bobbin-thread pull-oi, and a thread-cutter operative in the path of the bobbin-thread and in the path of one side only of the loop in the needle thread. Y

16. In a sewing machine, the combination with stitch-formin mechanism embodying a needle and a bobb1n,'of a loopdetainer andl spreader for enga-gin the needle-thread, a bobbin-thread pull-o having means for engaging one side ofthe -loop heldby said `detainer and spreader, and a thread-cutter operative in the path of the thread engaged by said pull-off. e

17. In a sewing machine, the combination with stitch-formin mechanism embodying a needle and a bobb1n,of a loop detainer and A spreader for engaging the needle-thread, a bobbin-thread pull-on' having -a slot for receivingone sideof the loop held by said detainer and spreader, and a thread-cutteroperative in the path of the threads engaged by said pull-on.

18. In a ysewing machine, the combination with a thread-cutting device located beneath the work-plate of the machine and adjacent to the point of descent of the needle, of a thread-grippingldevice comprising a plate bearing against the underside of said workv plate, and operating means whereby ,the .said

threadri in plate is caused to .en age said neegdlghrad and grip the same bengeath the work-plate duringthe formation of the first stitchmade subsequent to the threadsevering operation.-

19. In' a sewing machine, the combination I with a thread-cutting device located beneath the work plate of the machine `and adjacent I to the point of descent of the needle, of af stop-motion -device whereby groups-of a pre' determined number of stitches may bei f formed, a thread-grippingplate arranged to press the thread -agamst the underside of said work plate, and operating means where-` by said thread-gripping plate islcaused to engage the severed end of the needle thread and grip the same beneath the`worlr-platel during the formation of the first stitch of a group, and prevent it from being drawn up through the needle hole of the work-plate. v

20. In a sewing machine, the combination 'l with stitch-forming mechanism including a reciprocating needle carrying van upper 0 Ithread and a cooperating loop-taker,

thread severing device independent of the stitch-forming mechanism and comprising loop of upper thread, a movable implement for severing one limb of 'saidthread-loop,"

an implementfor entering and positioninga and independently acting means whereby said implements are differentially actuated,

21. In a sewing machine, the combination with stitch-forming mechanism embodying a needle and a bobbin,. of an automatic stop l f i V 5 mechanism, and a thread cutter coperetive Y Witnesses:

mechanism, a detainer andspreader for the name this specicationjin the presence of needle thread, :Ln-independent detainer for two subscribing` witnesses, this fth dayfofv j the bobbin thread, controlling connections May 1902.

between one of said detainers and said stop DANIEL MILLS.

withsaid detainers.. WM. A. SmzYoCK, l

In testimony whereof, I have signed my. A J. D. BROWN.

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