US958290A - Starting and stopping mechanism. - Google Patents

Description

T. G. PLANT.

AND STOPPING MECHANISM.

smn'rme APPLIOA'IION PILB D 0073.4, 1906. RENEWED NOV. 22, 1909.

Patented may 17, 1910.

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APPLIOATION FILED 0013.4, 1908. BEN

Patented May 17, 1910.

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T. G. PLANT. STARTING AND STOPPING MECHANISM. Arrmpnlon IILED'OOTA, 190s. gnnnwnn Nov. 22, 1909.

958,290, Patented May 1?, 1910.

4 SHEETS-SHEET 3.

T. G. PLANT. STARTING AND STOPPING MECHANISM. APPLICATION FILED 00m, 1906. RENEWED NOV. 22, 1909.

Patented May 17, 1910.

4 SHEETS-SHEET 4.

in" *5 WWW? l. A infil Sllfltfllllbr AND STOPPING MECHANISM.

Specification of LettcrS Patent.

Patentedll/llay N, 191d.

Application filedflctober l, 1906,.Se1'ia1 No. 337,339. Renewed November 22, 1909. -Seria1*No. 529,298.

-To. all whom it. may, QORQEWL.

of which the following description, in connection with the accompanying drawings, is a specification, like numerals on-the drawings, representing like parts.

in-many. machines, particularly in sewing iandbther machinescmployed in boot and shoe work,.it is desirable at the end of any pieeeofworktostop the machine always, at agiven and :certain point in its cycle of movement. 5111 some i machines, particularly in chain-stitchscwing machines, it is desirable 'fter theforwardmotion of the machine l restedtogive-to it a return or-retractive movement, to cause its needle to cast ed the last, loop theroomto permit the work to be withdrawn.

My present invention .aims to provide ncveland-improved nieansfor arresting or stopping amacliine,particularly a sewing machine, ialways rat a given, predetermined, or normal position, and :also means automatically'to produce-in connection with such sto ping of themachine a predetermined or suc'oisnt return or retractive movement thereof, or of such part-thereof as may be necessary or desired, for the purpose above mentinned. or otherwise.

My invention will be understood best-from a descriptionof .a machine illustrating one embodiment thereof, such for instance as shown in the accompanying drawings, wherein-- rFigurezl isa front elevation of a curved needle waathread sewing machine of the type commonly-used in the manufacture of boots shoes and known as a welter;

' Fig. '2iswmainly a vertical section along the axis of the drivingshaft-showing the principal parts of the mechanism illustrating the embodiment of my invention here shown; Fig. 3 is a vertical section on the dotted line 33, Fig. 2, looking to the right; Figs. l and 5 are vertical sections on the lines i l and 5-5 respectively, of Fig. 2, looking to the right.

:ln theparticular embodimentof my in vention selected for illustration herein and shown in the drawings the-sewing machine illustrated and in connection withwhlch my invention 1s. especially, but i not exclusively,

adapted may be of any desired type, so far as my inventionis concerned.

The main shaft typified at 3, the needle, its carrier and actuating meanstherefor, the feedslide 21, the awl 19, arranged to be moved therewith, and the ,awlactuating means, the channel feed-guide 30, also carried by said feed-slide, the looper 36, the back gage 107, slide rest 98 and locking means therefor, thcwaxing means 175, with the-operating means'for these parts: together with any associated or concomitant parts are or may be of desired construction. It is assumed that machines of this type are understood bythose-skilled in the: art and that no further description is necessary herein.

Referring now particularly to Fig. 2 at 86g., the main shaft 3 is shown.- extended to the right beyond the endmost shaft bearing and has loosely 'journaled about its outer end a suitable belt or driving-pulley 250, said, pulley being restrained at-the right against outward movement on said shaft by a cap or washer 251. At its'inner side face the hub of said pulleyis-provided with a driving-lug 252 adapted to coiiperate with an oppositely facing driving-lug 253 on the end of a hollow or cup-shaped cylindrical sleeve 25 i mounted to slide endwise on said shaft. t its inner end said sleeve is provided with a circumferential groove 255 which receives the forked arm of a bellcranked lever 25G, fulcrumed at 257 and controlled by a rod 258 dependingto a treadle or other suitable member, not shown. Concentrically arranged within and having rotative movement relative to said sleeve 25d is a second sleeve 259 circumferentially grooved to receive one or more guide-studs 260 seated in and projecting through said outer sleeve 254 and held in position by screws 261 tapped in-said outer sleeve. The studs may be screwed to a seat in-said outer sleeve so as to hold them firmly in position, but their heads prevent the ends of said studs from contacting with the bottom of the groove which they enter, thus insuring at all times free runnin engagement between the studs and the we ls of said groove.

The inner sleeve 259 is counter-bored interiorly to receive a air of nested coilsprings 262 separated 1f desired by a spacing ring .263, the opposite .ends of said springsbeing respectively engaged with or entered into the ends of said outer and inner sleeves 25d and 259, so that said springs will be put under or relieved of tension by rela- I directions properly to cooperate with the end tive rotation of the sleeves. lugs upon said collar; so that whereas the The inner end face of the outer sleeve engagement of the outer sleeve lug with the is provided with an internal lug 26%- adapted driving-pulley and the inner sleeve lug with when in proper position to engage with an the shaft collar was adapted to. drive the oppositely-facing cooperative lug 265 on the sald shaft in one direction, when said sleeves adjacent end of a collar 266 fastened upon are shifted to disengage the inner sleeve lu said shaft 8. At its opposite end said col from the collar and connect the oppositely lar is provided with an oppositely-facing facing outer sleeve lug with said collar, the lug 267 adapted when in proper position to parts are now in condition to permit of opcooperate with a corresponding lug 268 on posite rotation of the shaft by said concenthe inner face of the end of said inner sleeve tllc ev s- In other Words, Said e s 259. The length of said collar 266 is such Which are connected by the contained s rings that only one of its end lugs can be in en- 1 COI1St1tute a yielding single meml fer or gagement at a time with the cooperating 11 11 t0 Speak, WheI 1 moved into position 30 and opposed lugs upon the inner and outer at the rlgnt, as n F 1g.. 2, are adapted to sleeves described, said sleeves being mounted dllve h haf 3 111 ne dlrectlon, and when to slide on said shaft to cause their respective internal end lugs alternately to engage the end lugs of said collar. In the drawing, Fig. 2, the lug at the left end of said collar is shown in engagement with the lug on the end of the inner sleeve 259.

In the position shown, rotation of the driving or belt-pulley 250 will act correspondingly to rotate the outer sleeve 254, causing the wholewhen first set in rotation to operate through the connecting springs 262 to drag after it the correspondingly rotating inner sleeve 259. The inner sleeve in turn, through its lug 268, acts upon the lug 267 of the collar 266 to impart rotation in the same direction to the shaft 3 and to the machine. The effort required to start the shaft and the machine through the springs described will cause the latter at first to be put under tension, but as the ma chine gathers speed said springs will gradw ally recover and resume their normal (.011- dition in which they are sufficiently strong to operate the machine continuously.

lVhen it is desired to stop the machine the treadle, which has been maintained depressed in the position shown in Fig. 2 during the operation of the machine, is released to permit the spring 269, Fig. 2, to lift the same and shift the concentric sleeves 254;, 259, to the left on said shaft and relative to said collar to disengage the outer sleeve lug 253 from the hub lug 252 of the driving-pulley, and thereby to cut off the driving power to permit the machine to stop. This movement of said concentric sleeves at the same time throws the inner lug 264 of the outer sleeve into the path of and for engagement with the end. lug 265 of the collar 266, simultaneously disengaging the opposite collar lug 267 from the inner sleeve lug 268. As has been stated, the lugs at opposite ends of the collar 266 face in opposite directions, one being adapted to rotate said collar and its connected shaft in one direction and the other in an opposite direction; and also, as stated, the lugs upon the ends of the outer and inner sleeves 254, 259, face in opposite site direction. When in position at the right, 5 as shown, said sleeves are connected, also as shown, with the driving-pulley to drive them and the contained shaft in one direction to operate the machine. When slid to the left into opposite engagement with said shaft they are adapted, if restraint be exercised upon rotation of the sleeves, either gradually to stop the shaft in engagement therewith or, if desired, to impart opposite or retractive movement thereto. For this purpose the inner sleeve is provided at its outer end face (see Figs. 2 and 3) with a segmental lug or cam 270 upwardly inclined at one end and abruptly terminating in a stop face at its opposite end, and adapted when said sleeve is in its position at the left, Fig. 2, to be brought into the path of the stopend 271 of a lever 272 fulcrumed at 273 on one of the standards of the machine. Said lever has a second arm I 274 which (see-Fig. 2) is fitted at its 611Cl with an upwardly-facing brake-shoe 2'75 adapted to engage an internal cylindrical brake surface 276 on one of the cams 28, or on some other disk or member of the machine that rotates or is in motion when the machine is in operation.

The lever 272 (see Fig. 3) has a laterally extended arm, shown in dotted lines, which is fitted at its outer end with a cushion or rubber plug 277 adapted, when the lever is thrown to the left (see Fig. 3), to contact with an adjustable stop-screw 27 8 on the machine standard referred to.

The corresponding end of the outer sleeve cam or stop surface lug 279 inclined at one end and abruptly terminated or provided with a. stop surface at its other end; the stop surfaces of the two lugs 270 and 279 on the two sleeves, also the inclined surfaces 1 5 thereof, face in opposite directions, said lug 270 being also preferably somewhat higher than the lug 279.

WVhen now the machine is in operation with the parts as shown in Fig. 2, the opera- 13a shifted into an opposite position at the left are adapted to drive said shaft in an 0 p0- m 254 is likewise provided with a segmental 12g to its bearing, the machine is not fully spring-connected . sleeves 254 and 259 are slid to the left, disengaging the outer sleeve from the drivingalley and the inner sleeve from the shaft col ar, and by the same movement en aging the outer sleeve with the shaft col ar and placing the inner sleeve lug 270 in the plane of the brake-lever 271, so that before the machine has completed-a full revolution after the sleeves have been thus shifted the rotatin In 270 on the inner of the two sleeves wil stri e the end 271 of the brake-lever and throw the brake-shoe against the rotating brake surface on the cam or part 28 to arrest the machine. ,In arrestin the machine the first frictional contact 0 the brake-shoe with its brake surface serves to slow down the machine by the braking action thus produced; and the momentthe brake-shoe becomes firmly and finally seated upon its cooperating brakin surface, so that no further movement of t e brake-shoe is permitted, then the said lever end becomes in effect a rigid or fixed stop to prevent further rotative movement of the inner sleeve 259. p

While the brake-shoe, as stated, serves to retard or slow down the machine in coming stopped until after the inner sleeve lug has met and' been arrested by the brake-shoe lever, and then the machine is arrested only through the coiled springs connecting said inner sleeve with the outer sleeve, which is now in engagement with the shaft collar, the effect being, as the inner sleeve is brought to a state of rest, to cause said springs connecting it with the outer sleeve and the shaft collarto be coiled up or put under tension until the inertia of the running of the machine has been overcome and the machine brought to a state of rest. Of course, as these springs are gradually put under tension in the stopping of the machine their resistance or tension increases, iving a constantly increasing retarding effect in the direction opposed to the rotation of the shaft and tendmg to arrest it by a cushioning or yielding action on the one hand and bracing the brake-shoe with a constantly increasing pressure upon its braking surface on the other hand.

The machine having now been brought to a state of rest with the springs more or less under tension the said springs will recover and, in uncoiling to their former or normal condition, will rotate said outer sleeve in an opposite direction, correspondingly .turning the machine in an o posite or'retractive direction until the stop ug 279 on the outer sleeve is brought. around against'and is arrested by contact with the end 271 of the brake-lever which first disengages the brakeshoe from its braking surface, moving the braking-lever backward against the bufier 278 referred to, and bringing said outer sleeve, the collar shaft, and the machine to a final stateof rest, which is invariably 1n the 'same position. This retractive, sprlng-actuated movement of the machine before it is finally brought to a state of rest, when the machine is a sewin machine of the class here shown, is sufficient to produce the desired retractive movement of the needle to cause it to cast off its loop to permit the work to be removed from the machine. Thus when the concentric sleeves are thrown to the right into full line position, F i 2,.to start the machine the starting is e fe cted yieldingly through the coiled springs referred to, thus eliminating any shock in starting. After the machine is in operation, when it is desired to arrest the machine and the sleeves are moved to the left, the machine first feels the retarding effectof the brake-shoe meeting its braking surface and substantially simultaneously therewith the cushioning or resilient stopping due to the winding up of the springs, followed immediately and automatically by a recovery or reverse movement under the action of the springs until the parts are finally brou ht to a state of rest in final position. his final, or spring-actuated, reverse movement which brings the machine to a final state of rest is in the machine shown so slight that there is no objectionable shock in bringing it finally 'to a state of rest in the one invariable position in which it is desired the machine shall be finally arrested.

My invention, of course, is not limited to the particular embodiment here shown nor is it limited in its use to the particular machine shown, or to a sewing machine even; my invention being a plicable to any machine to which it may e found adapted.

Having described one embodiment of my invention, and without limiting myself to immaterial features and details, what I claim and desire to secure by Letters Patent is 1. In a sewing machine, the combination with a driving shaft, of a driving pulley loosely mounted thereon, a collar secured. against rotation on said shaft, a pair of cupshaped telescoping sleeves loose on said shaft and surrounding said collar, a yielding connection between said sleeves, means for connecting one of said sleeves with the driving pulley, and means for connecting said sleeves alternately with said collar.

2. In a seating machine, the combination with a driving shaft, of means for driving the shaft including a yielding member, brake means for the shaft including a stop arm, a pair of stops carried by the driving means, and provision for moving the driving means into position for one of its stops to engage the brake stop arm to stop rotation of the shaft and tension said yielding be. eeaaeo member, and for its other said brake stop arm on relaxation of said yielding member after being "(3I1$1Q11,8Cl.

Wit-hi3 driving shaft, of a pair of sleeves loose on said shaft, a yielding connectionv between said sleeves, brake means including a brake stop arm, an'oppositely facing lug, on each sleeve constructed an arranged to, cooperate with the opposite faces of said stop arm, meansto connect said sleeves and shaft, means to rotate the sleeves, and pro aision for moving said sleeves to bring their lugs iiito -operative relation with said brake stop arm; g 4. In a sewing machine t-he combination Withadriving shaft and a driving pulley loose thereon, of a collar secured to said shaft, a rotary IllQlIlbGI'dOOSG-Oll said shaft adjacent eachend of said collar, a, lug on stop to engage 1a yielding connection 1 said rotary member With the collar.

*each 'end of said collar, said lugs facing in opposite directions, a lug on each rotary I meniber for engaging said eollar lugs, means 3. In a sewing machine, the combination,=v

to connect one of said rotary members and said driving pulley and simultaneously engage the Other rotary member and; collar, between saidrotary members Wherethrough the shaft isv driven, and means to stop rotation of'the shaft, including provision for disengaging the puland itsrotary member and engaging In testimony whereof, I have signed my name to this specification, in the presence of two subscribing Witnesses. p

r THOMAS G. PLANT;

- lVitnesses:

FREDERICK L. EMERY, FRANCIS A. MILLS.

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