US958004A - Starting and stopping mechanism. - Google Patents

Description

M. D. PHELAN. STARTING AND STOPPING MECHANISM. APPLIOATION FILED JANJU, 1907. RENBWBD Nov. zz, 1909.

Patented May 17', 1910.

8 SHEETS-SHEET 1 MM? @ig- M. D; PHBLAN. A STARTING AND STOPPING MEUHANISM. APPLICATION FILED JAN. l1, 1907. RENEWBD NOV. 22, 1909.

958,004. Patented May 17, 1910.

3 SHEETS-SHEET 2.

'by uw M M. D. PHELAN. STARTING AND STOPPING MEGHANISM. APPLICATION FILED JAN.111907. RENEWBD NOV. ZZ, 1909. 958,004. Patented May 17, 1910.

s SHEETS-fissava anism,

MERTON D. PHELAN, 0F

A CORPORATION 0F NEW JERSEY.

` BOSTON, MASSACHUSETTS, MENTS, TO MANUFACTURERS MACHINE COMPANY,

ASSIGNOR, BY MESNE ASSIGN- OF MONTCLAIR, NEW JERSEY,

STARTING BIND STOPPING MECHANISM.

Specification of Letters Patent.

Patented May 17, 1910.

Application led January 11, 1907, Serial No. 351,844. -Renewed November 22, 1909.y Serial No. 529,315.

To all whom it may concern:

Be it known that I, MER'roN D. PHnLAis,

Suffolk and State of Massachusetts, have invented an Improvement in Starting and Stopping Mechof which the following description, in connection with the accompanying drawings, is a specification, like characters on the drawings representing like parts..

Starting and stopping mechanisms embodying this invention are particularly adapted for use on` high speed machines which are desired to be stopped promptly and with acting parts of the machines ,in

redetermined positions.

The invention is applicable with especially advantageous results to machines for insert-- A ing fastenings or the like in soles and heels of boots and shoes. Such machines are preferably driven at a very high rate of speed and it is frequently desirable so to control the operation of the machine that its driving shaft may be rotated for but a single revolution at usual speed and still be promptly and accurately arrested with the machineV parts in desired positions. While this invention provides for all such require= ments of high speed machines, it is of course susceptible of application to various sorts of machines regardless of their operatin speed.

The nature of the invention may` e b est understood from a description of a practical embodiment thereof, such as is shown for purposes of illustration in the accompanying drawings in which,

Figure 1 is a side elevation of a starting' and stopping mechanism partly in section on a vertical axial plane of the driving pulley ofthe mechanism; Fig. 2 is an end elevation (viewed from the right in Fig. 1) partly 1n section on the line 2-2 of Fig. 1; Fig. 3 is a detail `vertical section on the line 3-3 o Fig. 2; and Figs. 4 and 5 are detail perspectives.

The illustrative embodiment of the invention represented in the drawings shows a desirable form of starting and stopping mechanism as employed for controlli fr the rotation of a shaft 10. It sufiices to say that said shaft may be associated in any practicable manner with whatever machine is required to be driven.

Referring to Fig. 1, the shaft 10 is journaled 1n a part 11 of a frame casting and is driven through the agency of a clutch .member 12 fixed upon the shaft. Adjacent said clutch member 12 and rotatably mounted upon a loose sleeve 13 encircling the shaft 10, is a belt pulley 1/1 which carries a second clutch member 15 arranged for driving engagement with the member 12. The .belt pulley 14 is shifted axially on the sleeve 13 for clutching and unclutching; and the clutch. members are maintained normally disengaged by a coil-.spring 16 interposed between the hubs of said members and bearl ing at one end u on a loose ring 17 which supplies easy sli ing contact with the hub of the clutch member 15 and permits relative rotation of the clutch members unimpeded by the spring. The spring 16 when unresisted holds the hub of the clutch member 15 against aring 18, loosely mounted on the sleeve 13 and held against the pressure of the spring by means presently to be described.

The clutch is operated by wedge devices possessing several features of advantage. These devices comprise a squared block 19; a wedge 20 and a second wedge 21 which., "for convenience in description, may be designated respectively the negative and positive wedges, since the former is merely the passive agency through which the latter acts positively to throw the clutch members into engagement.

The block 19 is shown detached in Fic. 4I; and the negative wedge 2O in Fig. 5. aid block 19 is loosely mounted on the sleeve 13 and has an integral depending wedge-ad justing finger 22. bifurcated (see Fig. 5) and straddles the block 19, the vertical edges of the bifurcations contacting with wings 23 projecting laterally from the block. The lower portion of the wedge 2O has a slot 24 which incloses a stud projecting frourthc wedge-adjusting linger 22 of the block 19. Also the wedge 2O carries a. spring plunger 26, a1'- rangcd to project alternatively into holes 2T and 28 of the finger The block 19, being mounted on the sleeve 13, is incapable of vertical movement relative to the shaft 10; but the wedge 2O may be adjusted Vertieally on the block 19 to two j: )sitions de- T he negative wedge 20 is lOl termined by engagement of the lunger 26, and holes 27 and28 respective the slot 24 and stud 25 serving to guide such ad- ]ustment and maintain proper relative alinement of the finger-22 and the wedge 20. The plunger 26 1s provided with a head or handle whereby lit may be withdrawn conveniently from one hole preparatory to ad- ]ustmg the wedge 2O to the osition determined by the other hole. en the plunger 26 rests in the lower hole 27 the wedge 2O is in position to be engaged by the positive wedge 21 for throwin the clutch members into engagement; an when the *plunger rests in the upper hole 28 the wedge 20 is withdrawn from position to be acted upon 'by the positive wedge so that manipulation of the latter is prevented from effecting the clutching operation.` This provision is made for the purpose of permitting brake shoes, as hereinafter described, to release the shaft without at the same time engaging' the clutch,thus leavingt-he shaft free to be rotated by hand, if desired, independentlyV of the drive from the belt pulley.

The positive wedge 21 is bifurcated similarly to the negative wedge 2O and, adjacent to the latter, straddles the block 19, the inclined edges of the two wedges resting in contact with each other. explained, the wedge 21 can move in a vertical path only; and consequently (assuming that the plunger 26 rests in the lower hole 27 as in the drawings) when said wedge 21 is elevated, it forces the negative wedge 2O toward the right in Fig. 1. The latter, act

ing upon the wings 23 of block 19, moves the latter with it so that the ring 18 and clutch member 15 are also moved, all'in clpposition to the spring 16, and thereby t e clutch is engaged. The wedge 21 is moved in its vertical path by a clutch-controlling rod 29 rigidly connected at its lower end to a treadle rod 30 which is held normally depressed in a well-known manner by a spring 31. Thus, it will be observed, the spring 31 holds the positive wedge normally in its lovvermost position permitting the spring 16 to hold the parts unclutchedg and when the rods 30 is elevated by treadle or other controller the clutch is engaged.

Referring to Fig. 3, the sleeve 13 terminates adjacent the inner cud of the block 19 and nearby a brake drum 32 is fixed on the shaft 10. The hub of the brake drum 32 on the left in Fig. 3 abuts against a boss on the frame 11 which holds said hub against movement in that direction. Axially countersunk in the opposite end of the brake drum hub is a hardened annulus 33, separated by a ball bearing from a second exterior annulus 34, against which bear the sleeve 13, the block 19, and the positive wedge 21. Thus the wedge 21 is su ported against and guided in its vertical pat by an axially For reasons to be- .stationary surface suppl-ied by the annulus 34; and the same rigld surface limits .the action of the unclutching spring 16 communicated through the various intervening parts; At thefsame time the ball, bearing g1g). 3) permits easy relative rotation of t e rake drum 32 and the then stationary parts when the shaft is being driven.

Referring to Fig. 2, integral with the vertically movable positive wedge 214and extending above it, is a yoke 35 slotted at its upper end to receive the stud 36 of a cam roll 37 whichisvheldl against the surface of a brake cam' 38 secured (see Fig. 3) to the hub of the brake drum 32. The cam roll 37 is held in engagement with the ca m 38 through the agency of the spring 31 tending always to depress the .clutch controlling rod 29 and all partsconnected to it. The stud shaft 36 is vertically adjustable in the slotted end of the yoke 35.

As shown in Fig. 2, the cam 38 has a clutch releasing depression 39, the remainder of the cam constituting a dwell of uniform radius. VVhe the cam roll 37 rests in the depression39, the positive wedge 21 is free to be depressed by the spring 31 so as to disen age t 1e clutch member, but when the cam rol is in contact'with -the dwell of the cam the wedge 21 is maintained in its; elevated position and unclutching is thereby prevented, The de ression 39 on the cam 38 is so disposed on t e shaft that it engages the cam roll 37 when the acting parts of the -machine actuated by the shaft 10 have assumed the positions which they are desired to occupy when the machine is at rest. Hence, whenever the machine parts Vreach such positions the cam 38 stands in position to permit the unclutching of the machine Whereas at all other times the cam 38 prevents'unclutching. Obviously the arrival of the depression 39 of the-cam 38 in position to permit depression of the cam roll 37, will not result in clutching `so long as the operator, by means of histreadle or other control o poses the spring 31' and holds the rod 30 and) clutch control rod 29 in their elevated position." If, however,-the spring 31 be unopposed, the clutch members willbe disengaged whenever the depression 39 ofthe cam 38 reaches the position shown in Fig. 2.

In the manner just described this invention contemplates a prompt disengagement of the clutch members upon the instant that the shaft assumes the position it is desired to have when at rest. In most machines, however, mere unclutching at such a time is insuiiicient since the momentum of the machine is likely to carry the parts a convsidcrablc distance after the direct drive 'has ceased. .To prevent this overthrow 'thereis provided a brake mechanism such as to arrest the rotation of the shaft, preferably at once when the latter has been unclutched from the belt pulley. This brake mechanismVa/ctsfepon the brake drum 32 which is scribed, the operation being such that the.

fixed upon the shaft 10 and comprises oppositely disposed brake shoes 40 and 41.

The illustrative arrangement of brake shoes shown in the drawings is particularly effective. Said shoes are disposed diametrically oppositely with relation to the brake drum 32 and are carried upon a brake supporting arm 42. The middle portion of the arm 42 is bifurcated and straddles the annulus 34 on the shaft l0. Said bifurcations permit the arm a slight amount of endwise play. The arm 42 is non-rotatably sup ported in Abrackets 43-43' projected from the frame 1l and is arranged to slide' endwise in these brackets. The bra-ke shoe 40 is pivoted near the upper end of the arm 42 and is freely movable on said pivot. to permit it to adjust itselfto the periphery of the brake drum 32 when lpressed thereagainst, thus providing for the utilization of the entire braking surface of the shoe. The brake s hoe 41 is mounted by its concave cylindrical hub 44 upon a stud 45, constituting one arm of a bell crank lever pivoted on the lower end of the brake arm 42 (Fig. 2). The axis of the pivot of brake shoe 40 and the axis of the stud 45 are both preferred to be parallel to the axis 'of rotation of the brake drum 32 and hence, both of the brake shoes are free to rock more or less in the plane of the brake drum, thus providingr a air of self-adjusting brake shoes.

A leaf spring 46 secured to a part of the lower bracket 43 and bearing against the lower end of the arm 42 (see Fig. 2) may be employed, normally-to press said arm upwardly to hold the shoe 40 out of contact with the brake drum 32.

As already explained, the stud 45 for the brake shoe 41 constitutes one arm of a bell crank lever, the center of which is at 4T,

Fig. 2, it being noted also that the brake-- shoe 40 is pivotally1 mounted upon the arm 42. If, now, said bell crank lever be moved clockwise, as by the arm 4S, the brake shoe i t l 41 will be raised und them-ak@ Shoe 40 601-- integral with a split sleeve clamped upon respondingly lowered into binding` contactlever above referred to.

with the brake drum, such action being exercised through the toggle arrangement de points of pivotal connection between the -lower brake shf-e and its lever, the upper .brake shoe and the brake arm and thepoint 4T will approach more or less into a straight alinementpthus acting as a toggle in drawing the brake shoes substantially simultaneously against diametrically opposite portions of the brake arm,

The bell crank lever, of which the stud 45 one arm, is mov'cd clockwise -to the en-:ls just described through the agency of also the cam roll 3T" rests n i engagement its other arm 48 (Fig. 2). This arm 48 is brake arm 42 upwardly and remove' the brake shoe 40 from engagement with the drum 32. It is found in practice 'that if t-he spring 46 or its equivalent be not employed the brake shoe`40, upon thc release' of the shoe 41, as just described, will not maintain a sufficient engagement with the brake drum 32 to exert any material braking. action thereon. j

A convenient alternative or accompaniment to the spring 4G. if it be desired to employ some such expedient for lifting the shoe 40, may be supplied by extending a portion of the bell crank lever f5-48 in a finger 49 (see Fig. 2). arrangedto strike against a stop 50 ou the lower hracket 43 when the lever 45--1-8 is moved contraclockwise in Fig. 1. An adjustable stop screw 51 may be fixed in the finger 49, to vary the time in the movement of the lever 45-48 when the finger .-hall Contact with the stop 50. lVith this arrangement when the finger 49 strikes the stop 50, continued'.

rotation of the lever t5- t8 will serve to elevate the arm 42 and lift the upper shoe 40, while at the same time the lower shoe will be withdrawn from engagement with the brake drinn. lVhile the spring 4G, and the linger 4S) and stop 50 are shown as used to gether on the same machine, it is to be uridcrstood that they 1na \v be used separately. ln fact, practice has demonstrated that neither is essential though, perhaps. desirable. rl`he finger 49 and stop 50 are omitted from F l.

Referring to Figs. l and Q, the stud 45 to which the lower brake shoe 4l is pivotcd, is'

the hub of the other arm 4o of the bell crank B v loosening this split sleeve it may be rotated on the hub of the arm 4S and thereby adjusted to compensate for wear or for other purposes and said sleeve, ma)v Shenbe clamped in adjusted position.

rl`o Summarize. the operation of the speciic illiistratire forni of Starling and stopping mechani n| is as follows, to wit.; 'lhe machine .stands normally at rest and is so shown in' the drawings. .kt such a time the rod 43() and the clutch controlling rod 2S) i occupy their lowerlnost positions to which they` are. depressed b r the spring 3l: and

wit-h the clutch releasing depression on the cam 33. The brake shoes are in engagement with the lbrake drum, and, of course,l the machine is unclutchedv If, under these conditions therod be. elevated, as by a treadle, against the tension of theA spring 31, the rod 29 and the wedge v21 will be forced upwardly, thereby movlngihe wedge 20`to the right in F ig. 1 and throwing the clutch member, 1,5 into driving engagement with. the clutch-"member 12, whereupon the shaft 1 ,0 will befrotated.` Simultaneously withthe elevation of the rod 29 the cam roll 37 is lifted out of the depression 39 in the cam 38, -'an .jd also the bell crank lever 45-48 is roh.

tatedcontraclockwise to withdraw the brake shoesffrom braking engagement with theidrum, -leaving the latter free to rotate with the shaft 10. The rotation of the shaft,`and'whatever Inachinemay be driven thereby, will continueuninterruptedly until the treadle or othercontrolleris released,

3o however, when t e roll 37 .descends Ait will permitting the rod 30 to be again depressed y the spring 31. If at the moment of this release it should happen that the depression 39 of the cam 38 is in osition to receive the' then descending roll 3 the machine would be immediately unclutchedV and the brakes applied. In the :1t-majority of instances,

strike some portion ofthe dwell of the earn 38, the latter as. already described preventing unclutching by holding the' roll 37 in elevated position. Whem however, during the rotation of said dam' the depression 39 reaches the position shown in Fig. 2 the spring 31 is permitted to depress the rod 30, thereby withdrawing the wedge 21 permitting the spring 16 to-unclutch the machine, rocking the bell crank' lever 45--48 clockwise in Fig. 2, and thereby, by its strong toggle movement, forcing the brake shoes into firm and effective engagement with the brake drum 32.

It is understood, of course, that the operations just described as ensuing after/the entrance of the roll 37 into the cam depression 39 are performedzin the specific mechl anism described substantially instanta'ne`v ously, so that the brake drum 32 is forciblygripped between the brake shoes almost upon the instant that the roll 37 enters the depression 39.

If, at any time, it be desiredito turn the shaft 10 by hand or otherwise independently of the direct drive from the belt. pulley, it is desirable that concurrently -the clutch be disengaged and the brakes. in-

Vresults from the preferred coperation of active, leaving the shaft entirely free. In

' the operation of the machineas 'just described, this state of aii'airs will not nor' mally occur but it may be readily instituted by vertically adjustin the negative wedge .20 in the manner a ready described and thereafter elevating the rod 30 so as to disengage'tiebrakes.V Vertical adjustment of 'of --the cam 38.

Vtion of the latter whichaecom anies thetunbraking is idle as to any e eet upon the shaft ,which ,is then bothunclutched and unbraked andmay be 4turned at will. This condition will continue so-lon as the rod 30 is maintained in its elevate position and Veven after said rodhas been released from influence if at that time the in en gement with the dwell en, however, said cam roll enters into engagement with the clutch its elevatin cam roll 37 1 -releasing depression 39 on the cam the brakes will beset andx further rotation of the sha-ft\will be prevented. In this manner the stopping position of the shaft whether it be rotated by\`hand or, mechanically is definitely determined since the brakes will not at any time beapplied exceptthe shaft be in position determined -by engagement of the cam roll 37 and. the clutchreleasing depression 39 ofthe cam 38.

For lubricating purposes, the block 19 is provided with a cup 52, to contain voily waste, oil or the -like, which communicates by an outlet with the interior of the block adjacent the exterior of theV sleeve 13.- The periphery of said sleeve has one or moie longitudinal-grooves l53 which carry o1l throughout the length of-the sleeve; and these 'grooves have 'outlets communicating Y with the interiorof the sleeve Ywhere they deliver lubricant to the shaft 10. With this arrangement all 'the bearing surfaces of rotating parts are kept well lubricated'to contribnteto the easy operation of the mechanism.

It is found in practice that the arrangement ofl brake shoes and drums contemplated by this,in,vention as defined in the claims is so promptly and accurately effective as to avoid any necessity for a positive stop .such as is sometimes employed inthe form of an abut-ment against which some rotatin part impacts when it is desired to arrest sal part nd the machine. This being the case,

- the preferred mechanism shown in the drawi-ngs employs no positive stop whatever. It is to be nnderstood,howev er, that the em'- ployment of, a positive stop in connection with any featurev of this inventionwould not' remove such feature from the proper scope of the suh'oined claims.

yA further fe ture of decided advantage the roll 37 and Vcam 3-8 which is illustrated in the drawings. It will be observedV that .the cam 38 acts u onthe clutch controlling rod 29 along su stantially the same line in which the spring 31't'ends to move said rod. That is to say, when the spring' 31 is ready to act andthe roll 37 rests upon the driven member; a

dwell of the cam 38, said cam opposes the action of said spring in substantially the line of its impulse; and whentlie roll enters the depression 39 in the cam and the rod 29 is abandoned to the actionl of the spring, .the space of time intervening between the release .oi the roll and the communication of said release to the spring is minimized, permitting the spring to act'substantially instantaneously and to eHect the un'clutching and stopping of the machine always promptly'at the desired time. This advantage accrues ainly from the fact that this invention contemplates the elimination of all levers and the like, such as are commonly employed, intervening between the spring or other unclutching agency and the stop motion controlling cam which require a multiplication of motions to occur before the release afforded b y the cam can be .communicated to the spring or its equivalent.

Various advantages, other than those pointed out, are supplied by this inventiorn; and they will Vbe'apparent to those familiar with the art. Also .many changes possible to be made in the above described illustrative mechanism will appear to those-familiar with the art. For example,'in connection with a brake mechanism such as is contemplated by this .invention it might be practicable to employ various 'types -of clutch mechanisms and,.'apcoidingly, the invention is not to be restricted inits application to use in connection with Va clutch of the type or construction disclosed. Moreover, the details of construction of the brake mechanism are not to be considered as essential.-

Such mechanical alterations and modifications as are here alluded to are to be construed as included within the roper sco e of the invention as it is define in the su joined claims.

I claim: v 1. A starting and stopping mechanism having, in combination, a driving member; a lurality of brake shoes disposed diametrica ly of and to act on'thc driven member; a brake arm extending dianietrically of the driven member and carrying said brake shoes; actuating means for .the brake shoes including Said brake arm;

to act on the driven member; a diametrically disposed arm carrying said brake shoes; actuating means for the brake shoes including said arm; clutch mechanism; and stop' -motion controlling means controlling both.

the brake shoes and .the clutch mechanism.

3. A .starting and sto ping mechanism having, in combination, a riving member; a

driven member; clutch mechanism; a brake drum; an arm diametrically disposed with relation to the-drum; self-adjusting brake shoes connected to the arm; means including said larm to set and disengage one shoe, and by moving the arm to set the other shoe; and additional means acting when the first shoe is disengaged to move the arm and disen age the other shoe.

4. starting and stopping mechanism having, in combination, a driving member; a driven member; clutch mechanism; a brake drum; brake shoes; an arm extending dia- Ametrically of the 'driven member for supporting the shoes at opposite sides of the driven member; a lever pivoted to the arm; a pivotal connection between the lever and one brake shoe; and means for. adjusting said pivotal connection with relation to the lever.

5. A starting and, stopping mechanism having, in combination, a driving member ;.a driven member; a clutch; coperating wedges to o erat the clutch; means to move one wedge or controlling the clutch; means to adjust another wedge to interrupt said control; and brake mechanism operable con currently with movement of the-first mentioned wedge.

G. A startin and stopping mechanism having, in com nation, driving and driven members; a' clntch to operatively connect the driving and driven members; wedges 20 and 2l for operating the clutch; a rod 29 connected to one of said wedges; a finger 22 havin holes; anda device 26 to engage any one o said holes. 4

7. A startino Vand stopping mechanism, having, .in comnation, driving and driven members; clutch mechanismfor connecting and disconnecting the driving and driven members; an arm 42 extending diamet-rically of the driven member; a drum 32 shoes 40 and 41 carried, at opposite endsoiiwsaid arm; brackets 43; and a lever 4o-48 mountedI on said diametrically extending arm.

8. A starting and stopping mechanism having, in combination, driving anddriyen members; clutch mechanism for connecting and disconnecting said members a drum 32 movable in unison with the driven member;

shoes 40 and 41 disposed about said drum to A act thereon; an arm 42 carrying said shoes;

and means onmoving .the said arm endwise in op osite directions;

9. startin and stopping mechanism having,in com inationgtdrivin and driven members; clutch mechanism; a lock 19 hav'- ing wings 23; and wedges 20 and 21 one of which acts upon said wings, and both of said lwedges having portions embracing and guided by said block.

10. A starting and 'stopping mechanism having, in combination, a sha-ft; a sleeve 13' on the shaft; a clutch comprising fast and loosey clutch members; a block 19 on the sleevehaving projectn wing portions; a air of relatively mova le wedgesembracmg said block, one of which Wedges bears 5 against said projecting wings; and mens for relativelg moving said wedges to opery atev the clutc In testimony whereof, I have signed my nme to this specification, in the presence of tivo subscribing Witnesses.

MERTON D. PHELAN. Witnesses:

FREDERICK L. Emy,

LAURENCE A. JANNEY.

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