US2332649A

US2332649A - Driving and stopping mechanism

Info

Publication number: US2332649A
Application number: US194594A
Authority: US
Inventors: Clyde L Knott
Original assignee: United Shoe Machinery Corp
Current assignee: United Shoe Machinery Corp
Priority date: 1938-03-08
Filing date: 1938-03-08
Publication date: 1943-10-26
Anticipated expiration: 1960-10-26

Description

Oct. 26, 1943. c. L. KNOTT' I DRIVING AND STOPPING MECHANISMS 7 Sheets-Sheet 1 Filed March 8, 1938 0a. 26, 1943. c. .1. mo" 2.332,649

DRIVING AND STOPPING MECHANISMS Filed March 8, 1958 '7 Sheets-Sheet 2 Oct. 26, 1943. c." L. KNOTT 2,332,649

DRIVING AND STOPPING MECHANISMS C. L. KNOTT DRIVING AND STOPPING MECHANISMS Oct. 26, 1943.

7 Sheets-Sheet 5 Filed March 8, 1958 Oct. 26, 1943. c.. L. KNo'r'i' ,3

DRIVING AND STOPPING MECHANISMS Filed March 8, 1938 7 Sheets-Sheet 6 Oct. 26, 1943. c. 1.. KNOTT DRIVING AND STOPPING MECHANISMS 7 Sheets-Sheet 7 Filed March 8 1938 m2 e38 J W Patented a. 26, 1943 DRIVING AND s'rorriNoMEonANisr/i Clyde L. Kata, Beverly,":Massg assignor to United Shoe Machinery Corporation, Borough.

sey

of Flemington, N.J., a: corporationof New Jer- Applicafim March 1938, serial i 194,594

" 21Cla1ims. (o1'. 192- 14 l The present invention relates to driving and stopping mechanisms for heavily constructed machines, more particularly for high speed shoe sewing machines. i i

To provide" convenient control for a shoe sew-' ingmachine, a driving'and stopping mechanism for such: machine should act quickly and smoothly to bring the main sewingshaft of v the machine to rest at a predetermined point in its rotation without shock or undue strain on the operating parts. i The driving and stopping mechanism of a shoe sewing machine is ordinarily controlled by a' foot treadle arranged to be depressed in starting the machine, and to be capable of causing the mainsewing shaft to be driven faster'or slower, as more or lesspressure is exerted on the treadle. Sewing machines heretofore have been constructed with a number of different speed driving mechanisms ar ranged to be rendered operativeas the controlling foot treadle is depressed more or less, but certain difiiculties have been met with the use of driving mechanisms thus, operated. When the control treadle is depressed to one position it first causes rotation of the sewing shaft by one driving mechanism and, upon being depressed further to another position, causes rotation of the sewing shaft by another driving mechanismandbetween' said positions of the treadle, there will be, a. point where neither mechanism is operative so that the machine may come to rest by itself if the treadle isheld at that point. As a result irregular and uncertain operation of the machine may'occur. To avoid these difiiculties, certain prior equipped with two or more driving mechanisms have been so arranged that the lower speed driving mechanism acts through an overrunning clutch, thus rendering, the main shaft freevto run at a higher speed but with such an arrangement the lower speed driving mechanism is inefiectiveto. reduce quickly the speed of the sew-1 in: shaft after the shaft is driven at high speed, the momentum of the operating parts tendingto prolong high speed operation after the higher speed mechanism is disconnected.

The objects of the present invention are to provide a novel and improved heavily constructed high speed machine, of the type referred to, aving driving and stopping mechanisms which will avoid the above dificu-lties, and which will act positively under all conditions to, bring the machineto rest inapredetermined position or toeontrol the speed of theamachi-ne' easily and I machines quicklywithout the exercise of special skill or efiort on the part of the operator} With these and other objects in view, an important feature of the present invention relates to the provision, ina driving and stopping mechanism havinga driven shaft and main driving means therefor comprising'a plurality {of different speed driving mechanisms'of power actuated mechanism arranged for manual control to cause one of the driving mechanisms-to be disconnected and another to be connected Withoutdelay and, to remain connected until a predetermined position of the shaft is'reached' so that the speed'of the driven shaft will immediately be changed. In the'embodiment of the invention hereinafter described; the main drivingmeans is provided with mechanisms to op eratethe driven-shaft at either'high or inter mediate speeds, and there is alsoprovided low speed driving and brakingmechanism'for bring ing theshaft to proper stopping position after the main driving means is rendered inoperative, the main driving means and also the low speed driving and braking mechanism through suitable connections being under the control of a foot treadle. This arrangement, in a driving and stoppingme'chanismfi'of intermediate and high speed" driving mechanisms'controlledfrom a foot treadle, togetherwith alOWspeed driving and braking mechanism which is rendered operative in stopping the machine to act as a friction brake and then drive the shaft at'a reduced speed una1, a predetermined position of the shaft is reached, is believed to be new and constitutesa feature of the present invention whether or not power actuated mechanismis provided for shifting from one of the main driving mechanisms to the-other."

' In the above discussion of the invention, the expression main drivingmeans "'is intended to define" mechanisms which actfwhen in operation, to drivefthedriven shaft continuously at a working speedfor in other words, to drive the shaft :whilethe machine in which it is used is runningnormally to perform its intended functions. 'For convenience, thisexpression main drivingmeansdis-also used in the claims, and Where so'iused is tobe construed as defined above and as distinguishing from supplemental or auxiliary'driving means brought into operation in stopping ashait and acting forlonly one or a very'fevv revolutions of the shaft. Q

Other-featuresconsisting in certain constructions, arrangements andcombinati'ons of parts,

the advantages of which will be obvious to those skilled in the art from the following description taken in connection with the accompanying drawings, in which:

Figure 1 is a view in side elevation of a high speed shoe sewing machine having a driving and stopping mechanism embodying the features of the present invention; Figure 2 is a sectional view of a portion of the machine, on an enlarged scale, looking from the front, taken along the line 2-2 of Figure 1; Figure 3 is a right side view, partly in section, and partly broken away, of the portion of the machine including the driving and stopping mechanism, as viewed along the line,

33 of Figure 2, the parts being shown in stopped positions; Figure 4 is a left side view, partly broken away and shown in section, taken along the line 44 of Figure 2, of the driving and stopping mechanisms in high speed running positions; Figure 5 is a view of the main driving means for the machine, partly broken away, and shown in section along the line 5-5 of Figure 8, the parts being illustrated in intermediate speed running positions; Figure 6 is a sectional View of a portion of the main driving means illustrated in Figure 5,'taken along the line 6-6 of Figure 8; Figure '7 is a detail view showing a cam and follower in the positions indicated in Figure 6; Figure 8 is a sectional view of the main driving means, taken along the line 8-8 of Figure 5; Figure 9 is a detail sectional view, taken along the line 9--9 of Figure 8 of the main driving means, indicating theposition 'of the parts when the machine is at rest; Figure 10 is a view of the same parts. after the treadle has been fully depressed to cause the machine to be operated at its highest speed; Figure 11 is a horizontal sectional view of the frame and base of the machine, taken along the line ll|| of Figure 1; Figure 12 is a vertical sectional view of the frame and base, taken along the line l2l2 of Figure 11; and Figure 13 is a view in side elevation of the main driving means for the machine showing its method of mounting on the frame.

The machine herein disclosed as embodying theseveral features of the present invention is a shoe sewing machine having a sewing head 2 which is mounted on the upper end of a frame 4 of generally rectangular vertical section connected to a main base '6 of similar shape. The machine is driven by means of an electric motor 8 carried at the rear of the base 6 through belt connections includin a belt in which passes around a pulley l2 directly connected to the motor and around a ulley l fast to an intermediate shaft l6 for the main drivin means of the machine. The ma n driving means is connected by pull ys l8 and. 2" on the shaft I6 about which are

belts

22 and 24 extendin to

ulleys

26 and 28. res ecti ely; fastened to a driven operatin shaft 36 in he head ,2. The devices operated by the shaft 36 comprise the sewing instrumentali ties of a heavilv'cons ucted McKay type ma chine including a straight hook needle 32, and a looper for threading the needle contained within a rotatable shoe supporting horn 34 mounted on the main frame 40f the machine. The main driving means of themachine-acts to connect the continuously rotating motor with the operating shaft'iiil upon depression of a control treadle 36 mounted in the base 6 of themachine, and upon release of the treadle a low speed driving and braking mechanism is thrown into operation to act first as a brake .in reducing the speed of the sewing shaft 30 and then to drive the sewing shaft until a predetermined position of the shaft 7 is reached. v

The main driving means comprises clutches formed by the pulleys I8 and 20 respectively,

which are rotatable on the shaft l6anda central clutch disk 38 secured to the shaft, l6 and disposed between the pulleys l8 and 20. 1 The shaft I6 is mounted so as to be capable of slight longitudinal movement and the clutch disk 38 is provided at its opposite sides with facings cooperating with flanges formed on the pulleys l8 and 20 shaft will be driven at high speed and when the central clutch disk 38 is in engagement with the pulley l8 the operating shaft will bev driven at an intermediate driving speed as distinguished from the lowv speed at which the braking mechanism acts.

The low sp eed driving and braking mechanism is in part mountedon the operating shaft 30 and is similarin many respects to that employed in the machines, disclosed in the U. .3. Letters Patent to Topham No. 1,099,323 of June 9, 1914, and to Meyer; No. 1,298,758 of April 1, 1919, which have a low speedworm wheel similar to that indicated at 40 rotatable on the operat ing shaft. The worm wheel 40 is driven through a worm 42 secured to across shaft 44 provided at its outer end with a pulley 46. The worm wheel 40 has an inner conical clutch face arranged to cooperate with an outer. clutch face provided on a movable clutch member. 48 rotating with, but slidable along-the operating shaft 30. The hub of the movable clutch member 48 is provided with a timing cam slot .59 in-which a cam follower 52rides, so that the cam follower is vibrated continuously. while the machine is running. The cam follower 52 is mounted on one arm of a vibrating bell crank 54 fulcrumed on a stud 56 secured. in the head of the machine and another arm of. the bell crank has a recess into which the upper end ,of the vertical lock bolt or pin 58 may enter to hold the bell crank stationary and cause the clutchmember 48to slide towards the worm wheel 40.. The 1001;, can; 58 is raised towardsthe bell crank54 bya spring 59 within a horizontally sliding carrier .80 which is held towards the rightby means of the spring 62 (Fig. 2) to cause the movable clutch member 48 during rotation of the operating shaft 39 to engage the worm wheel 40 whenever the arm 54 is held stationary. V The timing cam slot 50 is so cut that the lock bolt 58 may enter the operating shaft'by the worm wheel 40 being so low that the'momentum of the operating'shaft may quickly be overcome by friction; The shaft then comes to restmwith the needle. disengaged from the work and the other zpartstinithe desired stopping pos'itions' mo ho'ld the movable clutch member out of engagement with the .Worm .wheel 'while the machine is :running, ithere FiS a tension spring- 64 (see Figs. 3 and 14:) connected .at one end with a pin '65 von the clutch member :48 one at' the other end with. a :pirr 6.8 i on the main sewir g s'haift. v

Fordriving theipulleyrlfl-tfi of the low speedqclriv ing and brakingimechanism there isa beltflfissurrounding the :pulley :MB ."and1.a;..c0ntinu0us1y :rotatting 1311-1163 secured :to theiouter end-pf a shaft 1:4 isuppaittedtin suitable bearings; thev axis -of which passes at right itanglestto the-.inte1tme-' diete shajft l-16. The sheftw'maisdriven 10y-,zniezms "-of spiral gear-511:8 Land .18.: made fast, respectively,

to the ?'intermediate :shaft zlsfivandfthe shaft 1.14.

When the trezidle firstiidepressed with =-the:machine=atirestfithe1 1ockiboltiEB is w thdraw from engagement with the belltqitenk'iiifi, :fihl ren'dering l the 110w speed driving z-mechanism "in- =operaitive and the =.c1ut.c-h ".disk .4518; is :pressed into 'frictioicml ieontact with the intermediate speed -:driving pulley t8vto :drive the ppeltating sheft. f fIhe zpr'essure of ithe disk 3.5 .ag;eir st the intermediate .3 speed driving :pnlley 31I1 &Y b6 :rlirectly control led :byzvarying {the .extent {to which the treadleisidepressed sotthat the operatingshfift may r-be arotated; atxeny sspeedgiipfto the speed of 'cacoozxdingitmthe :present inve tioneand o p "izent the izclutch disk 3' 38 gfIjOm being held manu- -;al=ly il'lla zmidepositioh gout{of.qdrivi g relation iWith either athe.intermed t r th hi h spe zidrivingjpil'lleys 8.8. :and tit, vat ral ygpo in rt movement ofathe trea'dle, there .is p1'0' lectively vcontrol'lerl pewerr'ac'tuated mechanism -.;.actingtWhen--:;the treadlevis depressed below an- I '.'-.interme.dia.te position. to d-iseonnecttthe intermefdiate speed .Idrivihg mechanisizn land; to. connect 'thezhigh speedpdrivi g mechanism-with themain r shaf1-,.;3ii. iwhenzthetreadle is'allowed torise,

:the Mpowereectuated mechanism disconnects the 1 thigh; i speed driving i mechanism nd r e co ects ithee intermejdiete speed -driving, mechanism. The

1:powemactuated-mechanismzaots. to shift the, trea- .'.d1e-:COI1nQC53i0Z-1s iwhich -press the. olutchdisl; 33

ega-insti the intermediate speed+dxivigagyulley. H5

.tma three-armed leverzfizftulcinimedwin them *Chih" frame. .Qnetarm otthe. three ermed lever 232: is. connected: to a horizontal rod 84,. ..the other #:fifld of "which is pivoted to. e1. fort-zed shifting. lever -.85shown .-in,- Eigure, 3, mounted on a. ,stationary pin, 88. .f-I'he forked levereflfi is; constructed with a channel shaped-section .end' has pivoted ,be- Y tween, its forked portions .ahollanflfl. surrounding .the forward iendfiof ;the intermediate shaft Hi.

When the treadlet is:depressed'therlever- 85 .acts, :through the. collar Side-171d through.a oompressiori spring i1 9 I .3011 the; intermediate. shaft to .move. the shazft lengthwise :ini itsvbeari g; thus-i forcing the elutch disk 38: which is {QSGCHZZEQ to the, shaft -against the pulley. .18. a r

" 5 uho tm en the eedl i d eein 1: i fies xe he iwee :fleese s s o e of wh qheneeei e we h-Dealin "detected M th .l .ai 199, e se, the: her nut-. 14 ite ded 91 .a tubula e 1 :hai i-n shoulde :iq s p qeti ie 91. 1e: thensleeves @31 .e .med ce en i of h the Mat resses.- thr ue the m e $5 t e space h?- ine he da y ainii .Q th shai t tucbu elt spacer 2 .5 e n e pan ion of h shrine 1 .191. meyonci the poin Wh se t the s ai w -P held w th the lu eh id skfi \q nt ell Aw ite zhetween the :n iley's. end? Le that .Whtl t -tnead "3.6 is ca ed t it l nel asedrposiii hethhiehzend .ih e zmedia eiq utqhe w behe epe --II0; 1iI it the. moverne t of the lever {Q36 lq im i qii dse ihs @1131 Testin eve i tee e eo -ihefethe mitfi e oezh qk i i 1c. .fic iqe i r W lt dr nei he=19c .r q 2 v of the low speed. d i i-ee an r i methen sm whenth t a le -.i .denre se in um i tired [1.0.51 h vin a hreade nne ti w ht i v2 b t a e y =on .ct s 1i@ 9 him 1 a ri h Angi eve 1 i ilc inied en s u m on th eqhi 'meem rtis dow rd e ei' i 1i e;erin-.-Q .h eve eer e M11195 a ains N he ca urieq e th n -.Q .e '-b .1 bloc ms -1 iide i we h caii 1m e hin if e n .i nn qied thrq i .t lfilmfi he ev rtsmh en eme t bein suc that t loc i qede em mthe .191 511 .55 .to'W fih e h l c messed b for th 111 21 difi :3 1.1 b i ht rint d ivi eiatie t e pu l {l e mowe actuat meehan sm tq p se a rhei ii s w er haf 1 .9 s l t n b t ition th e ie lwh h im e e retated- I. =1th .=s c i sh ft-"' ...'1eQe1; :mwnte ea ea m s i time -fieq red t iheishei l i a i 4 i aretete e tieuque in th id fi'e @rrowu ?i -.1 item the mete Th .12 s r v de w t a wi ls-porn I, .BLsur 'minding which is p wane e o eer ie etk L3 ithreue vh i tthreaded Mai e d I2 d 5 5 cap 1 1 23 ,s cii e rt a le rbl d ii" byvmits I26 eade itmthe. he e zihem fl w t ;;pa,s,s ;throug;h theg cap 124. The rods 122 aie edema i-t ei r uie @ed and s p e 4%!15 fifl;th -la tere twh t is t r demie ;ti e s fi -P3 55 1 5 t r 'fth Q$Y !2 m .havin duce en t li e y o. -:th :b 0 l-fii eB tww thee iisl eve i 1-2 end; time di ose ween. Spring- 1134 t I'-0Vi1 egavy' 1d ibtween the rodJtfZ arid the ma; whenthehigh speedclutch is closed. The .ceene te ieti v-rea w rdz end it ost;,ar-ms of a; -pair ofv similar levers dateligla end each provided ,with t IL M-T) at its .io er-most end. -When; the seu the disk 38 either in or out ofcontact with the intermediate speed pulley I8. I

'To' cause the shaft II2 to be held selectively in either of thetwo angular positions referred to, there is provided a clutch cooperatingwith the gear H4 and an escapement comprising two latches I44 and I46 mounted on stationary'pins I48. Cooperating with the latches is a pawl I50 secured to one end of a cylindrical block I52 rotatable in a clutch disc I54 which is keyed to the shaft II2 (see Fig. 8) and is provided with a cylindrical portion projecting into a ring [I55 secured to the gear H4,

The end of the block I52 which projects through the cylindrical portion of the clutch disc I54 is partly cut j away and is arranged to cooperate with recesses in the ring I56 (see Figs. 9 and the arrangecooperates with the pawl I50 the selector shaft f II2 is held in a position inwhich the'intermediate speed driving mechanism may operate and when the latch I46cooperat'es with the pawl I50, the shaft I I2 is held in the position in which the high speed driving mechanism is rendered operative. To hold the block I52 yieldingly'in v a position for driving the selector shaft, there is a spring I58 connected between the pawl and thefclutch disc I54 and the clutch disc is held from reverse movement after being stopped by a spring pressed finger I60 pivoted on the upper pin I48 and arranged .to engage either of a pair of oppositely disposed notches I62 when the shaft II2 stops. The latches I44 and I46 are controlled by a rod I63 pivotally connected between: the latches and a rod I64 connected between the latch I44 and one arm of the bell crank lever 86. When the treadle is depressed after the V clutch disk 38 is'moved against the intermediatespeed driving pulley I8, the latch I44 is moved ":away' from the pawl I50 and'the shaft II2 is :rotated 180 degrees until the pawl I50 engages :the latch I 46. The high speed driving mechanism is then thrown into operation and continues I vin operation until the treadle is released.

To avoid the sudden strainof 'abruptly'stopping the machine after the high speed driving 1 mechanism has'been operative, the intermediate I speed driving mechanism is first thrown into operation briefly after releasing the foot treadle before the low speed driving and braking mechanism becomes operative in order to quickly reduce the speed of the operating shaft. The selector shaft II2 is provided with a cam I66 and the lever 80 is provided with an upwardly extending arm having a roll I68 which, when the selector shaft is in high speed running position,

' does not permit the treadle to be moved immediately to its highest raised position, the roll I68 engaging thecam I66 to hold the treadle actuated connections in intermediate speed running position until the selector shaft has rotated through the first part of its movement. Thereafter the treadle actuated connections are shifted to fully raised positions and the lock bolt 58 is raised to cause .the low speed driving and braking mechanism to come into operation. 7 I

The general operation of the driving and stopping mechanism'will be apparent from Figures T l to 6. 'Starting with themachine at rest,;when

"raised, the lever I02 rotated in a clockwise direcspeeds.

the treadle '36 is depressed, the cam block I00'is speed driving pulley I8, as indicated in- Figures 5 and 6, to start the machine.- To varycthe speed of the machine, the pressure of contact between the clutch disk and the pulley, I8 is changed by the pressure applied ,to the treadle 38. Upon depressing the treadlefurther. the

spring SI 'is' compressed and the latch I44-is finally withdrawn from engagement with the The selector shaft.ll2 is then r0-- pawl I50. tated through 180 degrees until the pawl I50 strikes the latch I46 which has been *m'oved to operative position when the latch I44 disengaged the pawl I50. When'the selector shaft has reached the new rotary position, the crank H8, the pitman and the lever I36 cause theirh termediate shaft I6 to be moved rearwardly cornpressing the spring 9| still further and causing the intermediate speed clutch to be opened and the high speed clutch to be closed, as illustrated in Figure 4. The machine is thus-operated. at high speed. -Whe'n the'treadle is released, the treadle connections raise the latch' I46 sufllciently to clear the pawl I50 and again shift the latch I44 into the path of the pawl. The treadle is prevented from immediately reaching its highest raised position by the roll I68 which strikes the cam I66 so that the intermediate speed clutch is again held closed by the partially depressed treadle for a'short interval while the selector shaftis rotating to its original position. This short closing of the intermediate speed clutch causes the speed of the operating shaft 30 to quickly be reduced after running'at high The cam I66 also holds the'lock bolt 50 lowered during this short interval and the low speed driving and braking mechanism is there-, fore held inoperative. After the high part or the cam I66 has passed the roll 168, the treadle is released so that it may rise to its highest position and the intermediate speed clutch may open, the clutch disk 38 assuming a position between the intermediate and high speed pulleys.,

At the same time the lock bolt 58 is released so A that it may enter the openingin the lever 54 base 6, guide plates I14 having opposed sur- 7 I80 enters:

I10 (see Figs. ll and 12). The jack screwis threaded to a nut I12 secured in'themain frame 4 of the machine and engages with its lower end a horizontal portion of the. base 6. In

order to guide the vertical movement of the frame there are boltedto opposite sides of the faces between which the frame slides and'vertical guideways I16. In the guideways I16 are slidably mounted rectangular blocks I18 into each of which the threaded end of a clamp bolt The guide plates are also provided with ribs I82 disposed in-guideways'I8.4,-in the The intermediate.

arr-area mainframe.- Whenthebolts IBO- are. tightened:v

the frame is.-,se.cur.ely; held. in place at ,the. posi tion to whicheit-isaraisedby the jackscrew To maintain the proper tension: 01171711611101501. driven of the base-6, not coveredzby a guide plate, and

a-.lug on the support has-threaded throughit a,

second jackscrew [89,; the-head of; which is,

supportedby. a horizontal portionzof the base,

To provide means for easily adjusting the driving, belts and for: the main. drivingmeans,,

together with the treadle controlled-power actu,-- ated mechanism,;,.the, main driving; means and: the power actuatedmechanism-is supportedqna'bracket I90; bBStZShOTWIl in 1 3,.and is 56p arableas a unitfrom the main frame; 4 and. the sewing devices carriedthereby... The bracket.

I90 carries all cfthe bearings and pivots for the;

shafts and fulcrum. points; for levers directly, connected: with thedriving means and. power.

actuated mechanism", and issoarranged, that H upon disengagingthe belts. and disconnectin the treadleconnections: the bracketpand its mechanism together may be removed from the machine. vertically; to impart, the properv tension to the. belts'between the operating shaft and thefidriving means andis; supported upo-na vertical face; it! of theframeby bolts 192;- arranged inslots in the. bracketand threaded at their ends into the frame 4-. Toraise. and lcwerthe bracket, the. uppermost portion ofjthe bracket .198 carries vertical adjusting bolts i954, threaded. inthe bracket with their lowermostiends engagingtheuppermostbolts I82 so that when the adjusting bolts are rotated the bracket will ,be moved, to. ward or from theoperating devices driven; b the belts 22 and 2-4;.

The improvements in thefframe of the chine herein disclosed form; the subject-matter of av divisional application. for Shoe machine frames, filed JulyBO; 1-9,41-,'.Serial No. 404,631...

The-nature and object of. the invention hay ing. been indicated, and: an; embodiment ofthe: invention having: been; specifically described-,;

whatlis claimed is:

1AA driving and: stopping: mechanism having. in combination, av driven shaft, main drivingmeans therefor comprising. a plurality of different speed driving mechanisms, a bra-lief or the, driven. shaft, a member vibratedby the'drivenshaftfor' actuating the brake to bring the driven. shaft to, rest at a predetermined stopping position, and: manually controlledpower .actuatedwmechanism arranged when rendered. operative to. cause the. driven, shaft to .be disconnected from. one, of: the: driving mechanisms and; another driving mechanism to be connected and the vibrated member to be held inoperative to actuate thebrake until; both driving mechanisms v are disconnected. from the driven shaft. v

2. A driving and stopping mechanismhaving, in combination, a driven shaft, main driving means'therefor comprising. high and intermediaate speed driving mechanismalow'speed driving, mechanism constructed to act as a' friction brake when the main driving 'mechanism is thrown. out of operation, and. then to drive the shaft. at a reduced speed until a predetermined position of said shaftis reached, and. power actuated mechanism for selectively'rendering the high and: intermediate speed driving mechanisms cperativeto drive theshafth g H v The bracket may also. be adjusted;

pe ddriving,

. .derivin .andd ton iiigr cclianismh rms, driY a,

. i aitlatalrfe iiedl' speeduntil a predetermine nositieiipfsm.shaii;

is reached, an mechanisms for. eie irelr. res:

m chan ms p rativ after the. h ghmeed the. shaft, for. ureven the. ow: sheedtdi'ii ia. mechanismfr m one tilth i ermed ate;

4..A virie ands in. combination. a. drirenj; start. 11 dr ving mechanism therefo conmrisi a .ri t .q. i Qliltch jh piiehwhich the riafi; may be...driren.at adiiierentj pe i; a lo nee iqf. r n clut h. pnstriie eci. o. act. .frie 'en. b ake.du ing..st n ne dt n szd ethesh it; eta. re.d .s e. df 1 112 red ermi 9 '90 tion or. the haft: is reachedand a t .dl. and. connections. .qr .ceri rolliiia. e. slut main. drivin m chan m: an f ir e. w e d r v lutch. Qeerative 9. r1 sha t when; th v lu ch? z ne. mai driv n mechanis aretiirq n'oiitq i 9 ratibi driving nd: stongi egme han sm. liavina. in cornbi i t a dr v n Shaftma n riv mean the r c mnr ishieh ndt'in erniesiit Speed dr i .r ieehanism 1 9W- a edi r v m sm cn 'uc d o ct. r ct n brake h e main. ite m c anism. h qwn out of operation,,andj then to .drive the shaft}. i

at a reduceds-peed until a predetermined; posig' tion of'saidshaft' isreacheQ 'atre nections *f or rendering either the h termediate speed r in me iianisnrf'dperati eBi;

inoperative to. dri ethe sh t, a d f r. r d rin the low speed driving; mechanism operative in, ppin wh n the mainldrivinem ansr endered inoperative. I I

' 6. Adrivingand; stopping-mechanismhaving, in combination, a' driven shaft, main driving means therefor comprising high andintermedit pe d r vin mech n smsrlqw pe lr rin j mechan mconst u ed to a he a ri tiorib ake' whenthe indr vi em hanism 1, thrownpur; of. ope ati n. an th ir to d ve the sha t. a. reduced. speeduntila a prede ermined. posi ion. q said shaft is reached, a. treadle and connections f r. re der ng eith r. the. hi hg r the i t rme at speeddriving nechanism operative or inoperaiveto drivel t e or r nd r ng 0w peed drivi g. mecha m oper ve n steer n when the main driving means; is rendered inoperativaand. for renderin the ritsrme ee driving mecha smc ire e re he. .gw r d. drivin mechan tic dared q e ttiif ei t pping arterthe s aft? is..; i r ven br.t ih gh speed drivingmecha i sm. f 1 7.. A. drivirieand'stosu ns me ha ism. havin in co,mbi111atioi1.;.a dr ven-.5 .r vi ri i ie mechanismtherefor compr sing a friq wn luten throu h which. he. sha t. heisi ive varyi in rmediate. speed and aflc itqh h qu h. which the snaftmay be driven. eta. hi h speed a, slow peed driving QIL QQ FAQEQQfiQ' act a a. me hlnism drive? i clutch of the main driving mechanism operative and inoperative to drive the shaft,'for rendering the low speed driving clutch operative to drive the shaft in stopping when the clutches of'the main drivingmeohanism are rendered inoperative,'and for rendering the intermediate speed" clutch operative before the low speed clutch is rendered operative in stopping after the shaft is driven by the high speed clutch.

8. A driving and stoppingmechanism having,

' in combination, a driven shaft, main driving shaft to rest at a predetermined stoppingposi tion, and connections controlled by the foot'treae dle for rendering the vibrated. member inoperative to actuate the brake when either driving mechanism is connected to the driven shaft.

' .9. A' driving and stopping mechanism having,-v

in: combination, a driven shaft, main driving means therefor comprisinghigh and intermediate speed driving mechanisms, low speed driv ing mechanism constructed to act as afriction brake when the main driving means is thrown out of operation and then to drive the shaft at a reduced speed until a' predetermined position of said shaft is reached, power actuated mech anism, a foot treadle for controlling the power actuated mechanism to render either the high or the intermediate speed driving mechanisms operative, and connections between the low speed driving mechanism and the treadle for preventing operation of the low speed driving mechanism when the treadle is depressed.

10. A driving and stopping mechanism having, in combination, a driven shaft, main driving means therefor comprising highand intermediate speed driving mechanisms, low speed driving mechanism constructed to actas a friction brake when the main driving means is thrown out of operation and then to drive the shaft at a reduced speed until a predetermined position of said shaft is reached, power actuated mechanism, a foot treadle for controlling the power actuated mechanism to render either the high or the intermediate speed driving, mechanisms operative, connections for preventing operation of the low speed driving mechanism when the treadle is depressed, and means for actuating the connections to hold the low speed driving mechanism inoperative while the main driving means is operative.

11. A' drivingand, stopping mechanism having, in combination, a driven shaft, main driving means therefor comprising high and intermediate speed driving mechanisms,low speed driving mechanism constructedto act as a, friction brake when the main driving means is thrown out of operation and then to drive the shaftat a reduced speed until a predetermined position ofsaid shaft is reached, power actuated mechanism, a foot treadle for controlling the power actuated mechanism to render either the high or the intermediate speed driving mechanisms operative, connections for preventing actuation of the low speed driving mechanism when the treadle is depressed, and means operated by said power actuated mechanism for holding the treadle depressed, for apredetermined period of time i and for rendering the intermediate speed driving; mechanism operative after-theshaft is driven I by the highl speed driving mechanism;

12. A driving and stoppingmechanismhaving; in combina'tionfa driven shaft, main 'driving' means therefor comprising high? and intermedli ate speed driving mechanisms;-power actuated mechanism, a foot treadle f0r controlling "the" power actuated mechanism tofrender-either the high or the intermediatespeed driving mech'anisms selectively operative, said-power actuated mechanism including aclutch a driving mechanism'selector shaft arrange'd to be actuated by the clutch to a plurality of different angular po-' sitions,; in one of which operation of the high speed driving mechanism'is effected andin an-- other of which operation "of the intermediate speed driving mechanism iseffeoted'a brake for bringing the driven'shaft to rest in a predetermined angular position, and connections controlled vby the foot treadle to prevent the brake from being actuated when the high or intermediate speed mechanism is operated.

mechanism selector shaft arrangedto be actu ated by the clutch to a plurality of different angular positions, in one of which operation of one driving mechanism is effected, and in another of Y which operation of anotherdriving mechanism is effected, a foot treadle' fo'r controlling the clutch to move the'shaft 'toeither -of the two angular. positions, a brake for bringing the driven shaft to rest ina predetermined angular position, and

connections controlled by the fo'ot'treadle to prevent the brake from being actuated when either; 7

of the driving mechanisms is operative. u 7

14. A driving and stopping mechanism having,

in combination, a driven shaft, main driving a means therefor comprising a plurality of different i" speed driving mechanisms, power actuated mechanism including a clutch and a driving mecha nism selector shaft arranged to be actuated by the clutch to a plurality of differentangularpcsi tions, in one of which operation'ofone driving mechanism is effected, and in another of which operation of another driving mechanism is effected,a foot treadle for controlling the clutch to. move the selector shaft to either of the two angu-l lar positions," yielding connections actuated directly by the treadle when the treadle is depressed or released for causing anyxdriving mechanism to' be rendered-operative or"inoperative, respectively, a brake for bringing the driven shaft to rest in a predetermined angular position, and connections-controlled by the foot treadle to prevent the brake from being actuated-when either of the driving mechanisms is-operative.*

15. A driving and stopping mechanism having, in combination; a driven shaft, main driving means therefor comprising a pluralit of mechanisms for driving the shaftat different speeds; a foot treadle, direct mechanical connections be'-' tween the treadle and one of the mechanisms I shaft to rest in a predetermined'angular position,

and connections controlled by the foot treadle, when depressed partially, to prevent the brake from being actuated.

, 16. A driving and stopping mechanism having, in combination, a driven shaft, main driving means therefor comprising a plurality of clutches arranged when rendered operative to rotate the shaft at different speeds, a foot treadle, connections between one of the clutches and the foot treadle for causing operation of the shaft at one speed when the treadle is partially depressed, and

power actuated mechanism for opening the first mentioned clutch and closing another clutch to cause operationof the shaft at a higher speed when the foot treadle is further depressed and for again closing said first mentioned clutch when the treadle is released to cause the first mentioned clutch to act as a friction brake before again driving the shaft.

17. A driving and stopping mechanism having, in combination, a driven shaft, a plurality of mechanisms for driving the shaft at different speeds, a driving mechanism selector shaft, a clutch for driving the shaft, an escapement com-, prising a plurality of latches for controlling the clutch to cause the selector shaft to stop in any of a plurality of positions, and a foot treadle connected to the latches to move first one and then another out of stopping position as the treadle is depressed or released.

18. A driving and stopping mechanism having, in combination, a driven shaft, a plurality of mechanisms for driving the shaft at different speeds,' a driving mechanism selector shaft, a

clutch for driving the shaft, an escapement comprising a plurality of latches for controlling the clutch to cause the selector shaft to stop in any of a plurality of positions, a foot treadle connected to the latches for moving first one and then another out of stopping position as the treadle is depressed or released, and connections between one of the driving mechanisms and the treadle for causing said driving mechanism to become operative when the treadle is first depressed, and to become inoperative to drive the shaft when the treadle is released.

19. A driving and stopping mechanism having, in combination, a driven shaft, main driving mechanisms therefor comprising a pair of clutch disks, and a central disk between said pair, a foot treadle for moving said central disk into contact with oneof said pair, and power actuated 1nechanism under the control of the foot treadle for moving the central disk into contact with the other of the pair.

20.' A driving and stopping mechanism having, in combination, a driven shaft, main driving mechanisms therefor comprising a pair of clutch disks, and a central disk between said pair, a foot treadle, connections including a yielding memher for moving the central disk into contact with one of the pair of disks when the treadle is partially depressed, and power actuated mechanism the central disk into contact with the other of the pair of disks and against the force of the yielding member when the treadle is further depressed.

21. A driving and stopping mechanism having, in combination, a driven shaft, main driving means therefor comprising high and intermediate speed driving clutches, a low speed driving clutch, actuating means therefor constructed to cause the low speed clutch to act as a friction brake when the main driving mechanism is thrown out of operation and then to drive the shaft at a reduced speed until a predetermined position of the shaft is reached, a foot treadle, connections including a yielding member for closing the intermediate speed clutch and power actuated mechanism under the control of the foot treadle for opening the intermediate speed clutch and closing the high speed clutch against the force of the yielding member.