US1047111A - Stop-motion mechanism for sewing-machines. - Google Patents

Description

D. NOBLE & J. S. FINGH. STOP MOTION MECHANISM FOR SEWING MACHINES.

APPLICATION FILED DBO.19, 1906.

Patented Dec. 10, 1912.

6 SHEETSSHEET 1.

INVENTGRS DONALD NOELE AND JOHNS. F/NGH THE/R A TTORNEK WITNESSES:

' D; NOBLBG; J. s. FINCH. STOP MOTION MECHANISM FOR SEWING MACHINES.

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N1 "HUM!!! u 2 'OJ/OXL A ZLQZFE WIT/V588 8-" AND W 46. ,Jo/w S. FI/NCH, MIL; m

- THE/R A TTORNE Y.

D. NOBLE & J. S. FINCH.

STOP MOTION MECHANISM FOR SEWING MACHINES. APPLICATION FILED 1330.19, 1906.

1 41111; Patented Dec. 10,1912.

6 SHEETSSHEBT 3.

FVI'TNESSES 1/v VENIORS, Mm? 4K DONALD NOBLE v AND Y JOHN S-FI/VCH.

T E/RAITORME'X APPLICATION FILED DEO.19, 1906. 1,047, 1 1 1 Patented Dec. 10, 1912.

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WITNESSES: lNVzF/VRJARS 0 04/6. 0mg 12 NOBLE v JOHN s. F/NC/f- QIJMAI.

THE/RATTORNEY.

D. NOBLE &-J. S. PINCH.

STOP MOTION MECHANISM FOR SEWING MACHINES.

APPLICATION FILED DBO. 19, 1900.

6 SHEETSSHBET 5 O 45 I9 I a WITNESSES. 1 [NVENTORAW M46 DONALD NOBLE woH/v s. F/NCH ,WflZLMTJ THE! R A TTORZVE Y.

Patented Dec. 10, 1912.

D. NOBLE & J. S. FINGH. STOP MOTION MECHANISM FOR SEWING MACHINES. APPLICATION FILED DBO.19, 1906.

6 SHBETSAHEET e WlTNfiSSES: INVENTORS Whit DO/M2790 NOBLE SU /MM 2- I y QJIOH N THE/RA TTORNEY.

Patented Dec. 10, 1912.

UNiTEnsrAT s PATENT o' E o DONALD NOBLE AND JOHN "s; EINQH, OF BRIpGEron-Tj. co NEo'rIctiT, QSSiGNOBS, 'BY MESNE ASSIGNMENTS, To THE SINGER MANUFACTURING COMPANY, A CORPORA- TION OF NEW JERSEY.

s'roPuuo'rIoN MEoHANIsM FOR SEWING- ACHINES.

Patented neezib, 1912.

I f Application filed December 19, 1906. Serial No. 348,619.

States. residents of Bridgeport, in the county of Fairfield and State of Connecticut, have invented certain new .and useful Improvements in Stop-Motion Mechanisms for Sew-.

ing-Machines, of which the following is a specification.

This invention relates to improvements in stop-motion mechanisms, and one of its pbjects is to automatically slow the speed; o f a driven mechanism, preparatory to br nginginto action' the mechanism for arresting the action of such driven mechanism, by the em- I 'ployment of multiple belts driven at differ:

ent speeds and coacting with a stop-motion pulley and a loose pulley-said stop-motion pulley being provided-with multiple beltdriving surfaces, said belts being automati cally controlled for positioning them relatively to. the several belt-driyi'ng surfaces whenadjusted to slow the speed of the machine.

Another object is to provide the shaft upon which the stop-motion pulley is'mou nted with opposing elements located on opposite sides of a mechanism which, when actuated to stop'the machine, tends to force such opposing elementsin oppositedirections, thus relieving said 'shaftgof end thrust when brought to rest by the action-of the stopping.

mechanism, and when operatively connected with the soul'ceofower A furtherohject lsto IIHPIOYO such const action so as to: better adapt lift O the reqr remtmts' ofswing machine productions.

To the accompanyingdrawings illustratin the several figures of similarly designated.

of ab'uttonhole s'ew- 'elevatidn of F on the'lnie (1 21 Fig; '0 is a' vie w partially .insection oh with our invention:

the line G-H;'Fig. 2; Fig. 7 is a rear end elevation, similar to Fig. 3, together with the main driving shaft- (in section) upon which are secured pulleys ofunlike diameters for transmitting to the actuating mechanism of the button-hole sewing machine comparatively slow and fast speeds.

Our invention is herein shown and 'described as applied to a lVheeler & \Vilson huttonhole sewing'machine, but itis to be understood that it is equally applicable to machines for effecting the stitching or-overseaming of a predetermined design or figure,

such machines, for instance, as are used for sewing on buttons, working eyelets,'stay1ng seams and securing straps to under garments.

Many of the features of our present invention are similar in construction and operation to those of thedevice shown and described in U. S. Patent No. 656,853 issued to Donald Noble to which reference may be had, except that our present construction has been improved so as to better adapt it to the requirements of greater speed.

1 is the base of the sewing machine and 2 is its standard. 1 is the overhanging arm. and 4 is its base.

5 is the, main or needle-bar-actuating shaft and 6- is the loop-takerdriving shaft, said shafts being operatively connected by an upright shaft 7 and bevel gears 8, 9 and 10, 11, the two latter being of the -ra.tio,'of't\vo to one, thus giving to theloop-taker wo revolutions ito one complete; actuation of the .needle-carry ng,bar;

12 "is an iupright.gha ftljo in a bracket and ope; ativel i], corinect'ed with the. needle drivingsha-ft 5hr? gears' l4 and wait t v to one. thus giving 'to the shaft 12 one-revolution, totwo revolutions 11 0f the peedle ba r a'ctuating shaft 5:' -='l o the lowe 11d oftheshaft 12 is secured steed, eceent cQl-(i' andan overseaming eccentric 1T wliich,1t ln' o1'1ghsuitable conneetions (notishown),transmit to the clothholdingcla-in x: its step ;by,= step; feed move- "hUttOllliOlttiu. and: the 1 ai'eeessaryl: xgibratory all ' seam and barring stitches. To the vertical shaft 12, directly abovethe eccentric 17,'is secured a gear 18 which through suitable connections (not shown) transmits motion to the gear 20 which-is mounted on a-hub 21 secured in the bracket 19. Said gear 20 car- .ries a cam-driving disk 22 which, at a predetermined time, transmits motion to the barring cam 23 to which is secured thecon- 'troller cam 24, said cam being provided at its upper side with a belt-shifting cam 25 and tripping dog '26. The drawings illustrate a second dog 27 which is important to the control of the time at whichthe'cutter for cutting the buttonhole slit shall be actuated but not essential to the herein de-v scribed invention; accordingly, in the fur 'ther description of our invention reference "will be made only to the dog 26.

clutch-collar whiclrlatter'is secured upon a tubular shaft 34 mounted upon a second tubular shaft '35 which, in turn, is-mounted upon a rock-shaft 36. 1

37 is an operating lever fast upon the tubular shaft 34 and carrying at its outer end a rod38 which slides freely through a pivot pin 39. The rod 38 at its lower end-is attached to any suitable treadle connection (not shown) by which said rod may be opera-ted to start the machine.

40 is the cloth-clamp slide mounted in dove-tail ways 41-formed on the feed-slide 42, said feed-slide being similarly mounted in dove-tail ways 43 secured to the underside of the base 1.

44 is a post rigidly secured to the clothclamp slide 40 and passes through a hole 45 in the upper hinged section 46 of the cloth-' clamp, said hinged section being pivoted at 47 to :1 lug 48 formed upon the cloth-clamp slide 40. Interposed between the upper face of the slide 40 and the underside of the hinged section 46 of the cloth-clamp is .a

spring 49 bymeans of which said section 46 1s raised above the material held in the cloth-clamp.

- 50 1s a cloth-clamp-clo'sing lever provided with a cam portion 51, which latter bears the upright shaft'-12, gear 18, hub 21, gear 20, camdriving disk 22, barringcam 23,

controller cam 24, slidable connection 54,. and barring lever 55, which latter is oper at-ively connected, through suitable connections'(not shown), with the lever 56 which is pivoted at one end to the bracket 57 secured to the bracket or truss '19. The opposite end of the lever 56 is bifurcated to receive' the eccentric17 which gives to said lever its vibratory movements which, in turn, are ,transmitted to the cloth-clamp -.through the connections referred to.-

58 is a link connected at its lower end to the cloth-clamp lever 50 by a pin 59, its opposite end being pivotally connected, by a pivot stud 60,110 a lever 61 fast 'on the tubular reek-shaft 34.

62 is the needle carrying bar, 63 the needle, 64 the needle-thread take-up and 65 is the needle-thread tension device.

The foregoing is descriptive of the clothclamp and so much'of the cloth-clamp actuating mechanism as is deemed necessary for a proper understanding of the application of our i'nvention,*and comprises the same means and the same methods of operationas are fully illustrated and described in our pending United Statesapplicat-ion for improvements in buttonhole sewing machines, Serial No. 348,618, filed. December .19, 1906, to whichreferen'ce may be had. for a more detailed description of the parts previously referred to and their functions. V

- It'is to b'e understood that the controller cam 24, as in the buttonhole sewing machine application-above referred to, is given one complete rotation during \the overseaming of the sides and the barring of the opposite ends of the buttonhole, such rotation consisting of two semi-rotations, one for each barring operation.

, 66is a cam disk rigidly secured upon the shaft 5 in any suitable manner, as by a key 67. Upon the hub 68 .of the disk 66 is loosely mounted a stop-motion pulley 69 which 'is provided with an internal friction ring 70 secured fast to said pulley 69 between the disk 66 and a yielding disk 71, the latter being secured to said first mentioned disk 66 by screws 72 (preferably three in number).- Interposed between the heads of the screws 72 and the bottoms of the tion pulley 69 adjacent to the pulley 77 and similar in cross-section tothe belt groove formed in eachof the pulleys 7 6 and 77.

7 9 is a bushing rigidly secured in the rear end of the arm base 4 and supporting the bushing 80 within which is journa-led the Shaft 5, said bushing 80 being held in place with a shoe 100 adapted to 'engagca cam in any suitable manner, as by the usual set screw (not shown). 81 is a hub 01- ;ring formed on the bushing 79 concentric with the shaft 5 and bushing 80. F ittcd around said hub Slis a toothed disk 82, the inclined surfaces 83 of said teeth being adapted-to match and coiiperate with similarinclined surfaces 84 of complementary teeth formed on a brake disk 85, which latter is interposed between said disk 82 and the cam disk 66.

8G is a friction ring tpreferably of leather) fast to the cam diskhG, against which ring the face of the disk 85presses in' the act of stopping the machine. The disk 8213 held against rotation by an arm' 87 formed integral therewith in the end of which arm is fitted a stud 88 through which passes transverselyamadjusting screw 89;-

Said screw .89 is journaled after the mannerof a swivel in the end of a post 90 secured in the arm base 1'- in'any suitable manner; and-byturning said screw 89 the disk 82. may be adjusted axially around the huh 81 over which it is fitted.

91 is a resistingflange tighten the shaft 5 and hard against a shoulder 92 formed thereon.

93 is a brake ring supported in position by shouldered screws fiat tapped therein (preferably three in number) and which pass freely through the holes 95 in the bushing 79' and bear against the back of the disk 82. interposed between the ring 93and the flange 91 is a friction washer 96 (preferably.

made of leather).

Formed on -the brakedisk 85 is an ear 9? to which is pivoted M398 the releasing lever 99. Said lever 90 is provided with an upper horizontally disposed arin proiecting beneath the cam disk (36, which is provided step 101 formed on the periphery of said disk 06.: f

The operation of the toothed disks 82 p and 85 with respect to theeani diskjfiG is precisely similar to theope'ration of the g In running'position; the block 102 occu pies the upper. portion ot the can slot 103 analogous parts shown and described ini U. S. Patent'No.G56,83,previoiisly referred I to'; but since the efficiencyiofthesefparts has i been greatly increased by 6111- aidditii'nlal iniprovem'ents we will," for the purpose of a-' clear understanding, describe such -older tea} t tres of construction in connection with the elements which we haveadded.

in the lever 104, with the shoe withdrawn outside the path of rotation of the camstep 101. In such position there is no pressure in opposite directions between the disks'82 and 85, the latter-beingcaused to back away fioin the cam disk (36 by the pres sure of the springs Tibehind the heads of the screws 72, between which and said disk is interposed a hardened washer 105 to prevent undue wear.

outwardly slightly beyond the surface of the friction ring 86, and 'in assembling these stop-niotion parts the cam disk 66 is set in such position on the shaft 5that when the toothed disks 82 and 85 are closed-together,

said 'camdiskfiG and flange 91 will turn "within the path of rotatioi'i of the cam step frictioh' ring 70 car 101 by the action of the cam slot 103 on the block 102, causing said. canistep to strike said shoe 100 and tend to force .it away, which action is resisted by the "hape of the lower portion of the slot 103 in said lever 10-l.- The cam step 101 being unable to force the shoe 100.:nvay,ith ei"eby causes thelever 99 upon whichsaid shoe is carried, together with the disk 85 to which said lever is fulcrumed, to be rotated for a short distance. During such slightrotation of the disk 85 the shoe 100 will slip-partially up the gradual incline of said calnstep 101.

The slight rotary action thus imparted to the disk 85 causes the latter and the disk 82 to be spread slightly apart, the complementary inclines 83, 84 of the teeth formed thereon effecting such'spreading, as will be readily understood. As the disks 82, 85 are spread apart, the latter \vi-ll'be forced against the friction ring 86 on the rotary disk 66, and the formenthrough the screws 94, will force the brake'ring93 against the friction washer f lhsqueezing the latter between said ring and the flange Simultaneously with such act on, the screws-72 W1ll be com pressed againsttlie springs 14-, thereby releasing the 'ied by the stop-motion pulley fiflhfro n' being gripped between the disk and carnfidisklifi', tins leaving said stopfinot'ion" piillev 09 free to revblve as the machin ls'brought to rest, "which is efi'ected 'by'the 'it'riction supplied in" forcing the disk 85 against the ring 86and the'non-rotatable' rin 93 against the" iriction washer J6 and.

the action of the cam: step 101 on the shoe 100. It will be observed that thef-lateral pres- In released or running -p0sitionthe heads of the screws 72 pro ect sure supplied in forcing the brake members against the rotating members is exerted upon the same in opposite directions, and

that therefore, no end thrust is produced on the shaft, which is a very desirable condition. Also, by reason of. the friction ring 70, carried by the stop-motion pulley 69, being gripped in opposite direct-ions between two surfaces when actuated to drive the machine there is no end thrust of the shaft 5, which results in great economy of power.

- actuated to stop'the machine, as at the completion of a buttonhole.

The different speeds' are effected by two separate belts 107, 108 which run from driving pulleys 109, 110 secured upon the power shaft 111 mounted in s'uitablebearings in the hanger 112, the shaft 111 receiving'motion from any suitable source of power. The

belts engage at different times the belt-groove 78 on the stop-motion pulley 69 and the pulleys 76 and 77, as will be presently set forth.

113 is a belt shipper provided with a forked end 114 adapted to engage the belts 107, 108, said belt shipper being secured on .-the upper end of a short vertical rock-shaft 115, which latter is journaled in the outer end of a bracket 116 secured to the arm base 4 in any suitable manner, as by screw 117. Upon the lower end of the vertical shaft 115 is formed a crank-arm 118 to which is'pivoted at 119 one end of a link 120. The other end of said link is pivoted at 121 to a lever 122 pivoted at 123 to the inner end. of the bracket 116. Carried on the end of said lever 122 is a roll 124 adapted to be engaged attached to the link 120 at 127, while its other end is secured at 128 to the arm base 4,

the tendency of said spring bein' to keep the roll 124 on the, end ofthe ever '122 pressed in a direction to hold the belts in' operative relationship with the groove 78 and loose pulley 77.

129 is a stop-pin, carried by the link 120,"

mechanism is.,as follows: .As previously alluded to, the machine is stopped on the slower of the two speeds, delivered by the belt 108 at which time said belt is in engagementwith the tight pulley 76 and the high speed belt 107 is running upon the loose pulley 77. Soon after the machine is again started, the roll 124 will drop off from the end of the guard-rail 125 by the action of the spring 126, thereby causing the ,belt shifter 113 to be moved toward the left, which action shifts the high speed belt 107 0d from the loose pulley 77 and into the groove 78. At the time that the slow speed belt 108' is shipped -'from the tight pulley 76 over onto the loose pulley 77, the

cam 24 has entered upon the second-half of its rotation. Soonafter said cam 24has started upon the second'half of its rotation, the beveled'end 25 of the camguard-rail 125 will engage the roll 124 and cause the belt shifter 113 to be moved toward the right, which will cause the high speed belt 107 to be thrown out of the stop-motion pulley groove 78'-and onto the loose pulley 77 and at the same time the slow speed belt'108 will be thrown off from'. the loose pulley 77 and onto the tight pulle 76,

whereupon said belt 108 willact asarake to reduce thevelocity of the machine to a point equal to the speed at which said slow speed belt 108 is traveling. 1

Automatically reducing the speed of-th -maehine preparatory to automatically'stopping it is' a highly. important feature with respect to durability not only of the stop mot-ion mechanismbut the mechanism which it controls.

J ournaled in hearings 130 and131, formed on the lower portion of the arm base 4 at the rear side of .the machine, is a rock-shaft 132 which has secured tight on one end the lever 1323- while fast upon the; otheren'd is a lever 134. The lever 133 is provided at its free end with a roll 135 which coact-s with the under edge of the lever 37, while the lever 134 is provided at its end with. a stud 136, upon which latter is pivoted one end of a link 137, the other end of said link being pivoted around the stud 138 carried on one end of t he lever 104 pivoted at 139 to the base standard2.

The operation of our device 'is as follqgvsz'In the several figures the parts are shownin the position which they occupy when the machine is at rest. The machine is started by a movement ofthe lever 37 path of travel of the cat n'step 101 carried by the disk 66; and as soon asthe controller the tripping Qti'out ofcontact with the dePending-linger'QS the Spring MO will cause theipaivl 31 ;t o engage; the tooth 32,'- thus holding the lever 37 in the posit-ion shown in its rotation release thepawi3lfrom engagement with the tooth"3'2.j At the'time' ."that the rock-'shaft132 is rocked, by the action of the lever 3 lto'ii'ridyeithe shoe l'-out 'of the range of travel-of the cam'step 101, the lever 99, through connectionwitli the ear --97 formed integral withthe disk 82, and

the action of the c ani slot 103' upon the block 102' carried at the end of the'lcvei' 99,

causes the toothed'disks 82 and 85 to resume their normal or inactive positions rela-' to grip the friction ring (leather) 70 between the cam disk 66 and the disk 71, thus leavingthe shaft-5 free to be driven by the stop-motion pulleyfl69.

As the dog 26 in its rotation again strikes the depending finger 28 and releases the latch 31 from engagement with the tooth 32, the spring 106, through its action upon the lever 104,-causes the latter to be positionedas in Fig. 3, with the'lower end of the slot 103 in "contact with the block 102, thus causing thecam' step 101 "to act-upon the shoe 100, through which action, as previously explained, the disks 82 and 85 are caused'to be slightly separated, the disk 82, through its action upon the ends of the screws 04, forcing the ring 93 against the friction disk 90, thus arresting the-action of themachine, and the disk through its action upon the heads ofthe screws 72, at the same time forcing the disk ,7laway from the friction ring 70, thus permitting the stop-motion pulley and arts carried by it to run free -ipon Lhe shaft 5.

What we claim is y 1. In a stop-motion mechanism, an expanding mechanism, a shaft, 2. stop-motion pulley mounted upon said shaft to run indeendently of or to drive said shaft, a resisting flange secured on said shaft, and a:

movahledisk mounted concentrically to and Y rotatahly \\'i(.h saidishaft, said flange and disk arranged on opposite sides of said expanding mechanism, and automatic meansv for actuating said expanding mechanism to release said shaft from the driving control of said stop-motion pulley and act through the resisting flange to retard thelmotion of said shaft. 7 '2. Ii -a stop-motion mechanism, an expanding mechanism, a'shaft, a stop-motion pulley mounted uponsaid shaft to run inde pendently of or to drive said shaft, a resistsecured on said shaft, and a movable "llw mounted wmreutrieally to and ro tatably viiths'aid said flange and diskp "shaft andk-automatie means-.jfor actuating 1, m dotted l1nes, 'Fig. 5, until the dog'T-26 will" said' expandin g :mechanism to; release said Y shaftfrom: the driving control of said; stop;- motionpulley andact through tliegresisting flange to retardzthe motion-of saidsha ft, I

3'. In a Fsto'psmotion mechanism, an .e xpanding mechanism, a' shaft, a; stop-motion pulley mounted upon said shaft to run independently of or to drive said shaft, a resisting flangezsecured onI-said shaft, and a movable disk mountedsconcentrically. to androtatahly with saidshafg said flange anddiSkarranged on oppositegsi'desf of said, expand- 1ng'mechan1s1n;-..andautomatic means for actuating saidexpanding mechanism to re lease said shaft from the drivingcontrol. of said stop-motion pulley and act through the resisting flange to retard the motion of said shaft, in combination with]; multiple belts driven at: different speeds for connecting "said stop-motion pulley-with the sourceIpf power. 1.

4.. Ida stop-motion mechanismforsewing machines, :a stop-motion pulley mounted on the main or driving shaft of the sewing ma chine to .-rotate independently of or synchro- 'nously with said jshaft;,a. cam disk, secured to said main or driving. shaft, manually controlled fmeans -for ,oper,atively connecting said pulley and. disk, means, including. an; expanding; mechanism, for automatically 'oiscontinuing the v operative relationship of said stop motio'n pulley.- and said disk, and connectionsbetween said stop-motion pulley and theus'ource of power includingbelts driven. at different speeds, in combination with automaticmeansacting on said belts to reduce the-rs'peed o f the machine before. it is automatically broughtito rest. 5. Ina stop-motion mechanism-for sewing machines, means for driving is'aid meclia nism including pulleysof unlike diameters, a stop-motion pulley mounted on the main or driving shaft of the sewing machine to -rotate independently of .or synchronously with said shaft, a canidisk secured :to said main, or drivingshaft, means,- including an Expanding. fn'iechanisnnl, for au tolnatically discontinuing the 'operative; relationship of said stop motion pulley, and said disk, in combination \vith.belts for connecting said stop-motion pulley u'ith'said pulleys of unlike diameters-incombination with automatic means acting on' said belts to reduce the speed of;.th e machine heforeit "is auto} maticallybrought to rest. 6. In a stop-motion mechanism for sewing machines,, a 'stop mot-ion pulley mounted on the main or driving shaft ofthe sewing machine to Trctate; independently of or synehronousl with said shaft, a cam disk 'se too cured to said main or driving shaft, connections between said pulley and disk in cluding a yieldingly mounted disk, means,

including an expandin mechanism, for antomatically discontinuing the operative re- 10. in combination with automatic means acting on said belts to reduce the speed of the madisk secured to the main shaft'of the-sew chine before it is automatically brought to rest. H

7. In a stop-motion mechanism, a main shaft upon which is mounted a stop-motion Pulley capable of rotation with or indep-end' ently of said shaft, said pulley being provided with multiple belt-driving surfaces, a loose pulley mounted to rotate upon the same axis as said stop-motion pulley, and a cam disk carrying a yielding disk secured upon said shaft and coacting with said stopmotion pulley to drive said shaft, in combination with belts driven at different speeds for connecting said stop'motion pulley and loose pulley with the source of power, in combination with automatic means acting on said belts to reduce the speed of the 'machine before it is automatically brought to rest.

8. In a stop-motion mechanism for sewing machines, a resisting flange and a cam ing machine, a brake ring mounted independently of said shaft, a stop-motion pulley carrying a friction ring mounted upon said shaft and capable of being rotated with or independently of said shaft, and a yielding disk carried by said cam disk, in combination with oppositely arranged coacting disks provided with complemental teeth for forcing said yieldingly secured disk and brake ring in opposite directions.

9. In a stop-motion -mechanism, a main shaft, a stop-motion pulley mounted to rotate with or independently of said shaft and provided with multiple belt-driving surfaces, a cam disk carrying a yielding disk secured upon said shaft and coacting with said pulley to transmit power, and automatic means for discontinuing the operative relationship of said pulley and disk, in combination with driving pulleys of unlike diameters operatively connected with the source of power and belts for transmitting power from said pulleys of unlike diameters to said stop-motion pulley.

10. In a stop-motion mechanism for sew ing machines, means for driving said mechanlsm including pulleys of unlike diameters, a stop-motion pulley mounted on the main or driving shaft of the sewing machine to rotate independently of or synchronously with said shaft, a cam disk carrying a yielding disk secured to said .main or driving shaft, and belts for connecting said stop. motion pulleyf with said pulleys of unlike diameters, in combination with means including a cam and belt-shifting lever for automatically adjusting said belts to change the speed of said main or driving shaft of the sewing machine. 1

11. In a stop-motion mechanism, a main shaft, a stop-motion pulley mounted upon said shaft to rotate with or independently of said shaft, a cam disk secured upon said shaft, said pulley coacting with said cam disk to drive said shaft, oppositely arranged disks mounted concentrically to but inde-;

pendently of said shaft and provided with coacting complmental'teeth," a flange and cam disk secured uponsaid shaft, a brake 'ring mounted concentrically to but inde pendently of said shaft and cooperating with-said flange to resist the cam action of the oppositely arranged toothed-disks, and

a releasing lever provided with a brake shoe which is adapted-to coact with said cam disk toarrest the action of said main shaft.

12. In a stop-motion mechanism, a main shaft, a stop motion pulley mounted upon saidshaft to rotate with or independently of said shaft and provided with a friction ring, a cam disk secured upon said shaft and carryingra yieldingly-secured disk, said pulley and' cam disk, and yieldin'gly-secured disk to drive said shaft,. op osltely arranged disks mounted concentrica 1y to but independently of said shaft and provided with coacting 'com'plemental teeth, a resisting flange secured upon said shaft, a brake ring mounted concentrically to but independently of iction ring coacting with said said shaft and cooperating with said flange and cam disk to resist the action of the oppos tely arranged toothed disks, and a releasing lever provided with. a brake shoe which is adapted to coact with said cam disk to arrestthe-action of said main shaft.-

13. In a stop-motion mechanism forsewing machines a main shaft, 8. stop-motion pulley provided with a friction ring and mounted to rotate withor independently of said shaft, a resistance flange and a cam disk tight-on said main shaft, a releasinglever, a tripping dog, and a yielding disk, t he latter being provided with screws for securing it to said cam disk, said screws being provided with suitable springs .for holdm said yielding disk in contact with said riction ring, a brake ring provided with studs and adapted to cooperate with said flange, in combination with a toothed disk mounted concentrically to but independently of said main shaft and held against rotation, an opposing toothed disk'mounted in like. mannor and operatively connected with said rein one end of a cem lever, said cam lever be- Fail-field, and State of Connecticut, this ing manually controlled to start the sewing 18th day of December A. D. 1906,

machine in 0 eration, and automatically e y T cont-rolled, by the action of said tripping 5 dog, to cause said shoe to be brought into i i Contact With'said cam disk to arrest the ac- Witnesses tion of said machine. A. K. lVILLIAMs, J12,

Signed at Bridgeport, in the county of N. G. MARKS.

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