US1242247A - Driving and stopping mechanism. - Google Patents

Description

A. R. SCHOENKY. vDRIVING AND 'STOPPING MECHANISM.

APPLlcAnoN FILED ocr. 4. '1915.

Patented Oct. 9, 1917.

' 2 SHEETS-SHEET 1.

A.\R.scHoENKY. i DRIVING AND STOPPING IVIECHANISM.

APPLICATION FILEU OCT. 4, 1915.

`Patentd v Oct. 9, 191.7.

2 SHEETS-SHEET 2 AUGUST sorrentina, or soi/mammie, Massaoiiusnrrs, Assistme To miinierinonfj sHoE MACHINERY COMPANY', or BOSTON, MASSACHUSETTS', CORPORATION or MAINE. I

D-RIYHTG ANDSTQPPIiTo, MECHANISIVI.

To all who-m z2 may concern.' `i n Be it known` that L Aueiisr R.Sc-Homann.l

a citizen of the United States, residingat Somerville, in thecountyiof Middlesegr and/ State of Massachusetts, have iiiventedcer-v` tainnew and` vuse iiil Improvements in ,Drive l ing rand Stopping Mechanisms-, oi which the following is specication,.reference'being hadv thereinr to. the accompanying drawing.V

fllhis:` invention relates to driving and stopping mechanisms, and more particularly tov a. mechanism adapted to be incorporated.`

in power driven maohines,-in whichhigh-- or y destructive momentum is present lby reason Aof the` great `weight orspje'edr of the rotating parts.

The main object ot the present invention is Ato effectively-provide forthe stoppage of the rotating shafts'oiisiicha machine, so as to give a predeterminedfinal angularposition of theV shat and yet .without `iuidue or destructive shock, and to effect this accurate and easy stoppagein a predetermined manner and quickly in. point of: time.

It isa furthery object hereof tofbring about such an advantageous stoppage `of the Vmachine iny an automatic manner, `that is to say, without any special attention or skillL on the part of the operator. Further and detailed objects and advantages oi the pres- .ent inventionwill beeluoidated in the here,-

` inafter following description, or will beA apparent to those skilled in the art.

To the attainment of the above referred'v to objects. and advantages, the present in,- vention consists in the novel.L mechanisms,

devices, arrangements, detailsl and otherv -features herein shown or described.

In the accompanying drawings, FigureI 1 is a left elevation partlyin section on the plane 1 1. of Fig. 2 of a portion of a machine containing a driving and stopping mechanism embodying the present invention.

nism shown in, Fig. 1,;,withl the machine frame or case shownin section to better disclose the interior.

Fig. is a right elevationof certain parts Fig. 2 is; a front elevation of the meoha- *specifiqanonbf Lettersratem.- patgnted,@139119175 Applicationfilecieciober 4,1915. seiiaiiiofsassi il i y i l i 0f the meChanSm,takeiliiertly in Seetn@ be] showfthepartsin theirposition after` the machine has' been stopped..-

l The present invention ,if machine operates on. the principle of applying-to1 the fast rotatingfshaft after thefull, speed drivefhas been thrown out, afslovv` speed driving'means, which acts first to retard theu shaftto the designated slow speed, and then drifvelat suchslow speed substanf tially to` the stopping position, V whereupon, thev momentum havingfbeen very very largely eliminated,thel slow speed drive is thrown out, and af final stoppage effected, preferably by impact#l VThis operation is in. part automatically controlled by the machine its-eli for example, byA cam action fromfthe's'haft which is to bestopped., rcontrol lever operated 'ata suitableftime in the progressl vof the seam being stitched, servesy to throw.. out the high speed andfat once apply the, lowspeed=`power; l/Vhen thev operator istodeterniine the time or place oflstopping the stitching the ycontrol lever may be'v leveror pedal. VThe shaft cam lor controlinsures. at least a certainjfminimum period of low speedlrpovver application, and: then throws oii allj power and at once causes inal stoppage in av definiteshaft position. y

In the illustrated mechanism, therefore, the performance of the .described steps. is apportioned.' The control lever or pedal disengag'es the high speed power vand. en,- gages the low speed power.v The remainder of the action is purely automatic since the shaft, which isto be stopped, effects control. through its4 camsto throw out the low speed y power at ay certaingpoint in its rotation. and to causethe subsequent final stoppage, pref-A erably by impact, having previously set` the stopvk dogs ineffective position. j l

or 'stopping tically the time of final stoppage.

of the mechanism.

The low speed power, being thrown in by v the control lever or the strong spring `which actuates it, is not dependent upon the momentum ofthe rotating parts as in a case where the shaft itself causes the engagement of the low speed power.

The low speed is, therefore, always properly thrown in notwithstanding any deficiencyin momentum or in premature stop page. indeed, if the shaft has been prematurely stopped in the wrong position the mechanism hereof is such. as to "re-start the shaft at slow speed and promptly ystep it again in the desired angular position.

The function of the low speed drive or clutch is not only to carry the shaft to its final stopping position under conditions of negligible momentum, but to extract the destructive momentum by retarding the shaft from its high to its low speed, the

clutch members first sliding so as to effect this braking` or retarding action and then becoming accoupled. The period of sliding kor retarding should be as longas possible to avoid abruptness of action and shock, but cannot be prolonged to such an extent that the clutch members will still be sliding when theclutch is finally thrown out, for in that case the shaft will not have been properly reduced toits desired low speed condition. The mechanism hereof Igives full advantage of the low speed drive because the clutch is'engaged at the saine time and with the same motion that disengages the high speed clutch. The action of the low speed clutch, therefore, bridges over the entire period from the lifting ofthe pedal until prac- This obviously would not be the casev with a construction wherein the shaft effected the engagement of the low speed clutch. lNith the present construction the average time of action of the clutch is prolonged and therefore a slight amount of slack iii the clutch or a slight excess of slippage would be less likely to result in injury Vby the throwing out of power while the partsr still possessed a destructive amount of momentum.

Referring `first to some of the general parts, the machine is shown as having a hollow base casting 8, which incases parts Upstanding from the base is a post 9, which inay extend to a suitable height for the support of the stitching mechanism or other mechanism which is to be driven and stopped. The base also has an upstanding bracket 10, which supports a journal for a shaft 11, the post 9 supporting a journal at the other end of the shaft.

rfhe shaft 11 may be considered one cf the driven shafts of the machine, since it is permanently geared to the operating or stitching shaft and rotates and stops with the latter. y

Thus, at the front end of the shaft 11 is provided a bevel gear 12, ywhich vmeshes with a bevel gear 13 carried by a cross shaft 14, suitably journaled in the post 9. Y The cross shaft extends through the casing or wall of the post, and at its exterior'end is provided with a helical gear 15,7which is in mesh Vwith a helical gear 16 carried on a shaft 17 that extends upwardly, and is suitably geared to the operating or stitching shaft of the machine.

In orderto provide for the application of either high speed power or low speed power to the shaft 11,'it is shown as provided with driving connections including a high speed pulley 18,.turning looselyV on the shaft and a slow speed pulley 19,`also loosel on the shaft.'V rlhe Vratio ofthe speed ofthe pulleys 18 and 19 may he insoinesuitableA proportion, such-as five to one, sothat when l the shaft speed is reduced from the" high to the slow, its destructive momentum is-practically eliminated. ``With a ratio five to one, Y

the momentum reduction-would be in the ratio of twenty-five to one. That is to say, ninety-six per cent. of the momentum would' be absorbed in the process of retarding -or braking down the shaft to the slew speed.

Both pulleys 18 and 19 may be Vactuated from a common power 'shaft 20,' the latter having large 4and small pulleys 21 and 22 connected by belts 23 and 24 with the pulleys 18 and 19 respectively.

In order that the shaft llmay be coupled to either one of the constantly rotating driv-` rfhe sleeve 28 is splined to the shaft 11,.'and l only needs to be shifted axially, to cause one or the other of the clutch parts to take effect.

In orderto slide the double clutch deviceV 25 axially, a ring 29 is arranged loosely in a suitable groove in the sleeve 2S, and the ring is engaged by the upper ycked end of a lever 80, which lever is centrally vfulcrumed and is adapted to be swung between three positions, the central Vposition being neutral and serving to disengage both clutch parts, while the extreme positions cause the engagement of one or the other clutch part tc-v secure high or low speed in the shaft.

It will thus be seen that by moving the lever 30 at suitable times7 thespeed of the power application may be adjusted as required by the principles of this invention. The movements of the lever 30 may, for example, be effected partly at the will of the operator through a, starting lever, or pedal, or the like. The following connections may be. employed to secure this end.I

. A short link 31 is shown connected tothe `extremity of the lever 30`and'to the extremity of a swinging arm .32, the link and.

armV forming a toggle'by which the lever v pedalv from its bottom to its` stop position the rst result is the disengagement Vof the. high. speed clutch; -andfthis mayioccur.. at

the. pedalA position. indicated. at 345.1 AThe pedal then passes through the position 34.0, middle positifom'in which bothjclutches are thrown out. It then passes through 34dat which the low spoedf .clutch commences to engage.` guardfis released. At 34f the pedalis atthe top of its swing and the low speed'clutch is in full engagement.

The pedal lever is fulcrumed at 36, and is provided with a lifting spring 37, which is Strong @Dough to put the Vslow speed` pew@ into effect. Theoperator by depressing the pedal at will to its lowest position, puts the high power into effect upon starting the machine. When he desires tostop for any reason, for example, at the completion of the stitching operation, he will release the pedal thus disengaging the high speed power and engaging the slow speed, and the remainder ofthe stopping action is automatically controlled or effected by the machine, without the .attention or skillof the operator, or he may lift the pedal half -wa'y and swing hook 38 into osition 'to` hold it, upon which; the shaft is eft free to slowdown and stop by natural causes.

yThe spring 37 lifts the pedal, when re-v'.

leased, toits full. height, thus throwing. the slow speed clutch member 27 into engage.`

ment with the pulley 19. This action com.

mences with a slidingv engagement, the shaft 11 being easily brought down to the predetermined slow speed. As will be seen, the mechanism is so devised as to insure invariably a certain minimum extent of application of slow speed power. The mechanism thereupon throws all power off the shaft 11, and applies a suitable nal stop to the shaft. The details may be, for example, as follows:

A control cam or stop cam 39 is shown slidableZ axially upon a squared portion of the crossfshaft 14. This enables the cam to be shifted to the left wherev it will be inop` erative, or return to. its right hand position plunger, and utherefore. determine At 34e a certain stopmechanismV seenin. Fi-g-- 2,V where itv becomes effective, i

being'directly above its follower 5 6.

For shifting the stop cani 39, it maybe v` provided .with a grooved collarV` `40, engaged bypms at the Vextremities of an upright yoked arm41, which forms one partof a bell crank lever,;the othery arm 42 of the le-` ver extending horizontally-to the left.V The.

bell crank 41, 42 is fulcrumed on a. fixed bracket 43.secured tothe frame 'of thema! clli11 Beneath the extremity of the arm 42 and pivote'dthereto is aplunge'r 44 iittedat its.

lower end to slide within .af portion lof the bracket 43.` A. spring 4 5, which also bears on the .br.a c `ket,tends;` to. lift. the plunger,

and thereby'gforcethe stop cam toward its effective position,- and an, adj ustable limiting device consisting of. a pair oflock `nuts vnear the threaded, lower gend Vofthe plungerv 44,

serve toy limit the upwardrmvement ofthe hand positionofthe. cam.4 i

- Whenthep'lunger isv moveddown, and the stop camto. the. left as hereinbelow. de

scribed, the? parts are adapted to be ,temporarily-v locked in this condition by means of locking-teeth 47 formed on one side-of the plunger 44, adapted to engage corresponding teeth 48 on a locking bolt 49, which is normal-ly'pressed by a spring 50 toward the;

Forthese purposes the locking bolt 49 is shown, see Fig 6, as. provided with a lateral extension 51 supportinganf adjustable con` tact orV screw 52 adapted to be struck andA moved forwardly to retract the locking bolt, p lby abunter orpin 53. The described parts 44, 49 and 59. are all slidable inthe bracket 43.` Tlor'actuating the bunter 53, itis shown connectedv by a link 54 with the clutch vlever 30. By this arrangement when the clutch leverf has been thrown so as to apply slow speed power to the. shaftl 11, it actuates Vthe bunter53 to retract the locking bolt 49 and permit the plunger 44 vto rise underthe influence rofA its spring. The spring would thereuponV tend to move the stop cam 39 into effective position, but this action is controlledy or delayed in a manner that will hereinafter appear.

Directly below theeffective position of the cam 39, is theV pin or follower` 5.6/- slid-v ably m'ountedin lthe bracket 43. A spring 57Y tends to. lift the stop cam followerv or pin 56, and the pin is ,provided with an adjust#l the right.

les l izo iso

able stop 58 consisting of lock nuts on its threaded lower end for limiting the upward movement of the pin.

As will be seen, the stop cam pin serves not only as a follower actuated by the cam vfor controlling the throw-out of power, but

also serves asan impact pin or dog for securing the final stoppage in predetermined position.

VThe stop cam pin may, for-convenience, eect the throw-out of power by coperation with the pedal lever 34, andfor this purpose the lower end of the pin is shown as extending through ahole formed at 59 in the lever, the pin having an adjustable contact 60 consisting of a pair of lock nuts mounted on the threaded lower end of lthe pin, and adapted yat the proper time to force the pedal lever downward to its middle or neutral position 34C for throwing off all power.

The stop cam 39is shownto be in the form ofa plate or disk, and its contour is shown in Figs3 to 5. The cam is constructed with a deep recess or depression 61,

which is followed by a guard or concentric portion 62, this in turn, being followed by a rising portion 63, and lastly a final stop shoulder 64. y

It will be understoodthat in the normal ruiming of the machine, the stop cam pin 56 will stand to the right of the cam in Fig. 2, sothat the cam is ineffective, and the cam pin will also stand in its highest position as indicated in Fig. 4. This condition continues as long as the operator holds the pedal at its lowest position. 0n releasing the pedal, it springs to its highest position, thus throwing out the high speed power and throwing in the slow' speed power., The throwing .in of the slow speed power is accompaniedby the release of the plunger 44, so that the spring k45 thereafter tends to move thel cam 39 into effective position. This it is unable to do, however, until the depression 61 of the cam comes over the pin 56. This will be understood from Figs. 3,

and 4. The cam portions 6:2, 63 and 64 at the right hand face of the cam serve as a guard, preventing the cam moving into effective position. When the recess 6l has come above the follower pin as seen in Fig. 4, the cam 39 moves over the pin. From this point until the final stoppage, more than three-fourths of a revolution of the shaft must take place. Thereby is insured a substantial length of time for the slow speed clutch to take effect in performing its functions of first retarding the shaft to slow speed, and thereafter driving it at the slow speed. v

After the cam and pin have assumed the position seen in Fig. 4, the continued rotation of the 'cam first merely slightly depresses the pin, which is thereafter in sliding contact with the cam portion 62 until the rise or shoulder 63 comes into play to i force the pin downwardly to the position shown in Fig. 5. `This downward thrust of the cam pinacts through contact 60 to depress the pedal lever 34 to its middle position 34C, thus removing all power from Vthe shaft 11. This condition of affairs is Yfollowed immediately by the impact of the stop bell crank lever arm 42, such that on' depressing the pedal for restarting the machine the bell crank and the other partsare reset.` f Y Mechanism for driving and stopping one of the shafts of a high speed power operated machine has, therefore, been described, which includes in combination with a high speed drive means, a slow speed drive means, and ka final stop, a control part represented by the pedal lever 35 which is shiftable at suitable times but at indeterminate positions of the shaft, being shifted for example at will, and connections whereby the control part when it is shifted mayfboth disengage the high and engage the slow speed, together with automatic connections operative after the slow speed engagement whereby the shaftV itself may cause the disengagement of the slow speed and apply the final stop to-stop the shaft in a predetermined angular position. These automatic `connections are loo i shown as including in effect three shaft members combined in the single disk 39. Thus the shaft cam 63 is adapted to shift the control lever so as to disengage the slow speed. The shaft dog 64 serves forstopping the shaft in its predetermined position after the slow speed is disengaged. The face of 'the disk 39 constitutes a shaft guard for restraining the action of the shaft cam and dog until after a minimum extent of slow speed. By these elements when the lever is shifted from high speed to low speed position the shaft members, cam, dog and guard, are released to the action of their spring 45, but the guard restrains their movement into effective position until the non-rotating part 56 drops into the notch 61 of the guard, after which nearly a full rotation takes place before the shaft cam 63 throws the lever to` neutral position, thus disengaging the slow speed followed by impact of the shaft dog' 64 with the member 56. The slow speed is, therefore, invariablyvengaged for a mini'- three quartersrevolutions.

mumqjeriod of say threefquarters revolution and may zbe engaged for fas long ras one and If the present invention vbe used `on a stitching machine, such as used for stitching outsoles of shoes running Anormally at say- 500 revolutions per minute, and itis ldesired j `to jockey the pedal during 'its stitching operations so' as to permit slippage and Vcause the machine to^run inthe neighborhood of half theI fulll speed for special purposes, this can be done on lthepresent machine-without danger of accidentally stopping themachine. 1 Thus, the operator may-manipulate the pedalbetween the positions 34?* "andV 34h so as to reduce the efficiency of the high speed drive without, in fact, coming near to the higher position of the pedal in which the stop mechanism is apt 'to ybe applied. It vwill thus be seen that Iyhavev described a 'driving and stopping mechanism embodying the'principles of this invention, andzattainingits objects and advantages.-v Since Vmany matters' of arrangement, desigmdetail yand other features maybe-modified without departing from Vthe novel principles involved, it is not intended to restrict thei'n- Vvention to such features,i except sofar `asset forth in the `appended claims.-`

What is claimed is f l. A driving andstopping mechanism for a shaft of a high-speed,power-operated machine including in combination, high speed drive means, slow speed drive means, a final stop, a control part shiftablev at suitable times at indeterminate positions of thesliaft, i

connections whereby the control vpart when shifted may disengage the high andin the same action engage the slow speed drive means, and connections operative thereafter whereby the shaft may automatically disengage the slow speed drive means and apply the stop to stop the shaft in a predetermined angular position.l

2. A Vdriving-and stopping mechanism for 1 a shaft of a high-speed power-operated machine, including in combination, high speed drive means, slow speed drive means, a control'part shiftable at suitable times at indeterminate positions of the shaft, connections vwhereby the control part when shifted may disengage the high and engage the slow speeddrive means, asha'ft member adapted to shift said control part Vto disengagethe slow speed drive means, means for restrain-- ,ing the action of said member until afterthe slow speed drive means has been engaged, af stop device for stopping the shaft ina pre`l determined position after slow speed drive means is disengaged, and a' guard device for restraining the action of said member and stop device until after a minimum extent of slow speed drive engagement.

3. A driving and stopping mechanism for a shaft of a' high-speed power-operated ma- 'chineyincluding in combination, high and slow 2 speed drive means, va shiftable control device, .connections whereby lthe control device when shifted may shift the drive. from high to slow speed, a shaft cam adapted to shift said control Idevice to disengage slow. speed `drive means, connections controlled by said coiitroldevice for restraining the action" of said cam until the slow speed drivemeans has been engaged, a stop device fory stopping the shaft in a predetermined position afterstop 'device-causes final stoppage ina defini-te shaft position. i y

4. A driving and stopping mechanism for a shaft of a high-speed,- power-operated machine including yin combination, high Vand slow speeddrive meansya control lever therefor havinghigh speed, slow speed and neutral positions, a cam rotating with 'the shaft for shifting said lever'from slow speed Ato neutral position, a 'stop device comprising rotating and non-rotating stop members yfor causing Vfinal *stoppage in* predetermined shaft position, connections controlled by y"the lever for lrestraini'ngsaid'cam and stop device until after the slow speed vdrive means is engaged, and a device controlled bythe ioo shaft for thereafter` restrainingv said cam and stop device'to insure a minimum extent of slow speed vdrive engagement before the iinalthrow'outand stoppage.

5.v VA Ydriving'and stopping mechanism for a shaft of a high-speed power-operated machine, including' in combination, highA andV slow speed` drive means, means for at will throwing the slow drive into eifect at an iniio" determinate shaftposition, and automatic means set into action by the throwing ofthe slow speed drive means into effect for first insuring a minimum extent lof slow speed iis drive engagement, then throwing out the slow speed drive meansr and applying a stop at a predetermined'shaft position.

6. A drivingl and stopping mechanism for .j

a shaft of a high-speed, power-operated machine iiicluding yin combination, high and' slow speed drive means,'a control lever therefor shiftable atwill and having high speed,

. slow speed and neutral positions, a shifting.

device controlled, by the shaft for Aautomatically shifting said lever from slow causing final stoppage Vin predetermined shaft position, means for restraining said shifting device and stop device until after v speed toneutral position, a stop device for the slowv speed drive meansis engaged, and a guard device controlled by the shaftk for thereafter restraining said shifting device and stop device to insure a minimum extent of'slow speed vdrive engagement before the final throw out and stoppage.

'7. ln combination with a shaft adapted to be rotated-at high speed, means actuated -means operable independently of the shaft position for engagingr the slow drive at an indeterminate shaft position, and means controlled by the shaft itself for subsequently disengaging the slow drive at a predeterminedshaft position.

9. A. shaft stopping mechanism including in combination a slow speed drive adapted to be put into action between the normal running of the shaft and its final stoppage, means operable independently of the shaft position for engaging the slow drive at an indeterminate shaft position, means for maintaining suchk engagement for a minimum period, and means controlled by the lineage? yshaft `itself for 4subsequently disengaging the slow drive'at a predetermined shaft position.

10. A shaft stopping mechanism including in combination a slow speed drive adapted to beput into actionbetween the normal ruiming of the shaft and its final stoppage to progressively retard and slowly drive the shaft, means operable independently of the shaft position forengagingthe slow drive at an indeterminate shaft position, means for maintaining suchy engagement for a minimum period, and means controlled by the shaft itself for subsequently disengaging the slow drive at va predetermined shaft position. r

11. A shaftstopping mechanism including in combination a slow speedfdrive adapted to be put into action between the `normal means operable independently of the `shaft position for engaging the slow drive at an AUGUST sononNKY. Y

lrunning of the shaft and its final stoppage, Y,

Copies of this patent may be obtainedfor five cents each, by. addressing the'A-Gommssoner of Patents,` v

Y Washington, D. C.

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