US1429302A - Starting and stopping mechanism for presses - Google Patents

Description

W. C. STEWART.

snmme AND STOPPING MECHANISM FOR PRESSES.

APPLICATION FILED MAY15. 1916. 1 Lqzg gogi PatentedSept. 19, 1922.

3 SHEETS-SHEET 1.

W. C. STEWART.

STARTING AND STOPPING MECHANISM FOR PRES SE8 I APPLICATION FILE D MAY15, 1916.

1,429,302; r I Pat tedse t.19,1922.

3 SHEETS-SHEET 2.

w. c. STEWART STARTING AND STOPPING MECHANISM FOR PRESSES.

Patented Sept. 19, 1922.

3 SHEETS-SHEET 3.

APPLICATION FILED MAY 15, 1916.

- flvvmvma Fag 4. fim dmd Patented Sept. 19, 1922.

entree stares PATENT entice.

WILLIAM G. STEwART, or swAMPsCoTT, MASSACHUSETTS, Ass eNoR, BY MESNE ASSIGNMENTS, To UNITED SHOE MACHINERY CORPORATION, or PATERSON, I, NEW JERSEY, A CORPORATION OE NEW JERSEY.

STARTING AN STOPPING MECHANISM FOR PRESSES.

Application filed May 15, 1916. Serial No. 97,583.

To all whom it may concern.

Be it known that I, WILLIAM C. STEWART, a subject of the King of England, residing at Swampscott, in the county of Essex and State of Massachusetts, have invented certain Improvements in Starting and Stopping Mechanisms for Presses, of which the following description, in connection with the accompanying drawings, is a specification, like reference characters on the drawings indicating like parts in the several figures.

This invention relates to starting and stopping mechanisms, and particularly to mechanisms of this general class which are especially adapted for use in controlling the operation of presses of a well known type of which the so-called gearless sole cutting mach ne, used for dieing out soles in the manufacture of boots and shoes, is a characteristic example.

In machines of this type a platen or beam and a stock support or bed are relatively moved to effect an operation, such as a dieing-out operation, on a sheet of stock, such movement being initiated at the will of the operator through connection of the driven mechanism with suitable driving means and the movement being stopped after a single operation on the stock through automatic disconnection of the driven mechanism from the driving means and usually also through the application of a brake. Machines of this type, as usually, constructed, have a single operating shaft to which a comparat vely heavy and rapidly rotated pulley or fly-wheel is connected by means of a manually operated clutch to effect an operation of the machine. In order to avoid danger to the operator and damage to the stock, it is necessary in machines of this type to provide positive insurance against accidental repetition of the operative movements. Various means have been devised for this purpose, of which a characteristic example is afiorded by the construction shown in United States Letters Patent No. 1,194,379, granted on August 15, 1916, upon the application of J. Gouldbourn and A. Bates,

An object of this invention is to provide lmproved starting and stopping mechanism for machFnes of the indicated type which shall be positive and certain in its action and shall afford complete insurance against injury to the operator or damage to the stock through accidental repetition of the operative movements of the machine. Further objects are to provide mechanism of this kind which shall be simple in construction and so located on the machine as to avoid accidentalinterference with its operation, while opposing no obstruction to manipulation of the stock, and also topro- .Vide such mechanism as may be readily applied to machines at present in use.

To the above and other ends, a feature of the invention consists ina novel con struction and arrangement ofclutch operating mechanism including a controlling member and means for insuring against accidental movement of themember beyond the required position in such manner as to effect prematurely an operation of the clutch. In the construction shown the clutch operating mechanism includes a controlling member which is rotatable in successive steps in the same direction to cause the clu'tchto beset and released alternately, movement of the member to cause the settingof the clutch being effected by a treadle and movement to cause the release of the clutch being effected by the driven mechanism, and, means is provided for preventing accidental. overthrow of the member in such manneras to cause the succeeding movement of the clutch to be effected prematurely.

A further feature of the invention consists in Starting and stopping mechanism including a clutch and a brake and novel means for preventing movement of the mechanism to start the machine in case the brake has failed to perform its functlon properly in a preceding operation. I

The above and also other features of the invention, residing in the general organization of the mechanism for the purposes in view, together with certain details of construction and combinations of parts, will now be described with reference to the accompanying drawings and pointed out in the claims.

In the drawings:

Fig. l is a view in front elevation, with portions shown in vertical section, of the lower portion of a gear-less sole cutting machine including mechanism in which the in vention is embodied,

Fig. 2 is a vertical section in a plane mid way between opposite ends of Fig. 1, showing the parts on a larger scale,

Fig. 3 is a view on a larger scale, partly in elevation and partly in vertical section on the line 33 of Fig. 4L, of a portion of the mechanism seen in Fig. 1, with the parts shown in a different position in order to illustrate an abnormal condition in the operation of the mechanism, the casting 54 being omitted for the sake of clearness in the showing, 7

Fig. 4 is a plan view of the parts seen in Fig. 3, with a portion in section substantially on the line l-l of Fig. 3,

Fig. 5 shows in detail mechanism for preventing operation of the clutch in case the brake fails to perform its function properly,

Fig. v6 shows in detail a portion of the brake operating means, and

Fig. 7 is a diagrammatic view illustrating the operation of the brake.

'The machine in which mechanism embodying this invention is shown as incorporated comprises upright frame castings 2 at opposite ends connected at the front and the back by cross-pieces 4. The frame supportsin the usual way acutting block (not shown) upon which a sheet of stock is placed in position for the dieing-out operation. The end castings 2 are provided with bearings 6 for four vertical rods 8 which support at their upper ends in the usual way a platen or beam (not shown) which extends over the cutting block. The rods 8 are connected at their lower ends by yokes 10, and on each yoke is pivoted a pitman 12 which embraces an eccentric 14 on a driving shaft 16, the shaft extending longitudinally of the machine beneath the cutting block and rotating in bearings in the frame castings 2. In the normal stationary positions of the parts the high points of the eccentries 14 are above the shaft 16 in substantially vertical alinement with the center of the shaft, thus holding the beam upraised from the cutting block in position to permit a die to be placed in the desired loca tion upon the stock. In the operation of the machine, after the die has been properly'positioneth'the shaft 16 is caused to make a single revolution, thus lowering the beam into engagement with the die to effect a cutting operation and then returning the beam to its starting position.

At one end of the shaft 16 is a clutch comprising a member 18 fast on the shaft and a member 20 mounted loosely on the shaft and slidable into or out of engagement with the member 18. The member 20 is formed to receive a belt on its periphery and thus serves as a pulley from which power is transmitted through the member 18 to the shaft 16. The member 20, moreover, is comparatively heavy and thus insures by reason of its momentum a rapid and effective operation of the machine. A lever 22 pivoted to the casting 2 serves as a part of the clutch operating mechanism to be hereinafter described in detail, wherebythe member 20 is moved into or out of engagement with the member 11.8.

At the opposite end of the shaft 16 is a brake for stopping the rotation of the shaft in the desired position, the brake comprising a drum 24 secured to the shaft and a flexible band 26 which in the construction shown almost completely encircles the drum. The band is anchored at one side of the drum on an arm 28 which is pivoted on a stud 3O projecting from the casting 2, the arm 28 being pivotally connected to a shoe 32 which is secured to the band. Pivotally mounted on one end of the band 26 on the opposite side of the drum is a bell crank 3% one arm of which is connected by means of a link 36 to the other end of the band, and connected to the other arm of the bell crank is a rod 38 through which the operation of the brake is effected. It will be readily understood by reference to Figs. 2 and 6 that downward movement of the rod 38 will serve to draw the ends of the brake bandmore closely together and thus apply the brake and that upward movement of the rod will serve to loosen the band and thus release the brake. In order to minimize the shock upon the rod 38 and connected parts when the brake is suddenly applied, the rod is provided with a slot 40 to receive a pin 42 on the bell crank 34, and the bell crank bears against a collar 44 which is mounted to slide upwardly on the rod 38 against the tension of a spring 46 the other end of which bears against a stationary collar 48 on the rod. A yielding connection is thus afforded between the rod 38 and the bell crank 34 toabsorb any shock incidental to the application of the brake,

"The rod 38 is connected at its upper end to one arm of a bell crank 50 which is pivoted on the casting 2, and the other arm of this bell crank is connected by means of a rod 52 to the clutch lever 22at the opposite end of the machine. The rod 38 and the lever 22 are connected in such relation that movement of the rod 52 in one 'direction, toward the left as viewed in Fig. 1, serves to set the clutch and release the 1,429,302 &.,

brake, thus causing the shaft 16 to be rotated, and movement of the rod in the opposite direction serves to release the clutch and apply the brake to stop the rotation of the shaft.

Extending transversely of the machine and suspended at opposite ends from the cross pieces 4 is a bracket 54L on a portion of which is pivoted a bell crank 56 having an upwardly extending'arm pivotally con- IIBCtGCl to the rod 52 and a laterally extending arm provided with a roll 58 Which rests upon the periphery of a controlling member comprising a wheel 60'having alternate depressions 62 and elevations or cams 64. A strong spring 66 anchored at one'end to one of the frame members 2 and connected at its other end to the bell crank 56 tends to swing the bell crank in a direction to move the rod 52 toward the left (Fig. 1)

and thus set the clutch and release the brake,

to cause the machine to be operated. .The spring is permitted to effect such movement of the rod 52 when one of the depressionsv 62 in the wheel 60 is carried under the roll 58 by movement of the wheel in a clockwise bracket 54.

direction, (Fig. 3). The cams 64,0n the other hand, serve to operate the bell crank in opposition to the spring 66 to cause the release of the clutch and the application of the brake and thus to stop the rotation of the shaft 16. i

. The wheel 60 is carried by a short shaft68 which extends transversely of the machine and is mounted to rotate in bearings on the Movement of the shaft 68 lengthwise in its bearings is prevented by means of a collar 70 at one side of the rear bearing and by the wheel 60 secured to the shaft at the other side of the bearing. The front portion of the shaft 68 is reduced in diameter and turnsin a bushing 72, which, by reason of a feather 74 between the-bushing and the bracket 54 is prevented from turning but is permitted to be moved in adjustment lengthwise of the shaft 68. nut 76 on the outer end of the shaft determines theadjustment of the bushing.

Keyed upon the reduced portion of the shaft 68 is a hub 78 on the front end of which is formed a portion 80 of a divided ratchet wheel of which the complementary portion comprises a disk 82 mounted loosely on the shaft and'having teeth of the same form and number as the rear portion 80. The hubI78 and theportions 80 and 82 .of the ratchet wheel occupythe space between the end of the larger portion of the shaft 68 and the bushing 72. The purpose of the twopart construction of the ratchet wheel will be hereinafter explained.

Sleeved upon the hub 78 and retained thereon by means of a collar 84 secured to the shaft 68, is an arm 86 upon which is piv oted a pawl 88 for engagement with the teeth of the ratchet wheel 80, 82. A spring 90 connected at one end to a pin 92 on the pawl and at'its other end to a pin 94 on the arm 86 maintains the pawl normally in position to engage the ratchet. teeth, the pin 92 being extended for engagement with thearrn 86 to limit movement of the pawl toward the andis pivoted in bearings in the end cast- I ings 2 through the provision-of a rock shaft 104. A spring 106 supports the treadle in its uppermost position which is determined by the engagement of a stop 108 on the rod 98 with a slotted lug 110. projecting from the bracket 54. 'Downward movement of the treadle moreover, is limited by the engagement of sto 112 on the rod 98 with the lug 110. T e exact amount ofmovement of the treadle to turn the ratchet wheel the required distance is thereby insured, this movement serving to carry one of the depressions 62 in the periphery of the cont-roller wheel 60 beneath the roll 58 and thereby cause the rod 52 to be operated :by

thespring 66 to set the clutch and. release the brake. The'treadle may then be released to permit thepawl 88 to return to its starting position. The stops 108 and112 com prise nuts adjustable lengthwise of the rod 98 to vary as required the initial position and the extent of movementof the pawl.

The controller'wheel 60 having been turned through the action of the treadle the required distance to cause the machine to'op- I erate, the. succeeding movement of the wheel, in the same direction, to carry a cam 64 beneath the'roll 58 and thereby positively operate the rod 52 to release the clutch and apply thefbrake and thus stop the shaft 16 at i the end of one revolution, is to be effected automatically by the operation of the driven mechanism. To this end, one of the rods 8' carries a bracket 114 on which is pivoted". a pawl .116 positioned normally by gravity with itsfront end resting on'the bracket as shown inFig. 3.. When the rods 8 .move downwardly during the first half revolution of the shaft-16, the pawl 116 lifts andpasses idly by the teeth of the ratchet wheel 80, 82, but'on the upward movement of. the. rods after the cutting operation has been effected the'pawl engages a tooth of the wheel and causes the shaft 68 and thecontrollerwheel 60 to turn the required distance to operate 6 the bell crank56 and stop the machine. The bracket 114 is adjustable on the rod 8 to permit the pawl to be properly positioned. It Will be apparent that. the operator may safely keep the treadle depressed until after the upward movement of the pawl 116, since the teeth of the ratchet wheel will pass idly byv the pawl 88. Before starting the ma chine a second time it is necessary to release the treadle and permit it to swing to its limit of upward movement.

In order to guard against a premature operationof the clutch and the'brake, either to start or to'stop the machine, means is provided for locking the shaft 68 and the parts carried thereby against material movement beyond the point to which they are advanced by the action of either of the p'awls 88 or 116. Are-previously stated, the disk 82 which constitutes the front portion 7 of the ratchet wheel, is free to turn about i the shaft 68, while the rear or main portion 80 of the, wheel is fixed to the shaft. In the front face of tee portion 80 is a hardened bearing member 118 provided with a hearing face 120 inclined to the direction of movement of, the wheel, and positioned within an opening in the disk 82 between the bearing face 120 and the end of the bushing 72 is a conical roll 122, the face 120 and the end face of the bushing 72 being shaped in conformity to the tapering periphery of the roll. The diameter of the roll 122 at any point is less than the corresponding distance between the end face of the bushing 7 2 and'the front or leading portion of the face 120, with reference to the direction of rotation of the ratchet wheel, but is greater than such distance measured from the rear portion of the face 120. Theparts described therefore constitute a clutch which is efiective either to prevent or to permit movement of the shaft 88 according to the position of the roll 122.

The action of the clutch is determined by the position of the disk 82, in an'opening in which, as previously explained, the roll is"seated. Springs 124 connected to pins 126 on the disk 82 and to pins 128 on the member 80 tend to turn the disk relatively to the member 80 in a direction opposite to the [direction of rotation of the ratchet wheel' andj thus to wedge the roll 122 between the bushing 72 and the rear portion of the bearing face 120 in such manner as to lock the shaft 68 and the. parts carried thereby against forward movement. The disk 82 is provided with slots 180 to receive the pins 128and permit the disk to move relatively to the member 80, and the pins 128 may undersome conditions limit movement of the diskin the direction to lock theshaft.

When theroll '122 is so positioned as to restrain the shaft 68 from forward move ment, as shown for example in Figs. 3 and 4-, the teeth of the disk 82 are offset from the corresponding teeth. of the member 80 of the ratchet wheel. Both the pawls 88 and 116, however, of sufiicient width to engage the teeth on both portions 80, 82 of the-ratchet wheel, and consequently the first action of eitherpawl in its operative movement, in case the corresponding teeth are out of alinement, is to aline the teeth on the two portions of the wheel through movement of themember 82 relatively to the member 80 and thus to release the roll 122 from wedging engagement with the face 120 and the bushing 72 and permit the shaft 68 to turn, continued movement of the pawl'then effecting theturning movement of the shaft. Normally the angular advance of the shaft 68 will be only that directly effected by-the engagement of the pawl-88 or 116 with a tooth of the ratchet wheel and'conscquentlythe teeth of the two portions of the wheel will be held in alinement even after movement of the pawl has ceased. and the 'shaft'68 will nothe locked.

Should it happen, however, either by reason of'wear of the hearings in which the shaft 68 is mounted, orfrom other cause, that the shaft 68 and the parts? carried thereby should tend to advance by momentum in such manner as to carry a tooth of the ratchet wheel beyond the range of action of the pawl, the springs 124- will immediately move the disk 82 relatively to the member 80 and thus cause the shaft to be locked through the action of the roll 122. Such a condition is illustrated in Fig. 3, where the parts have been impelled slightly by momentum beyond the normal point of ad vance corresponding to theupward move ment of the pawl 116, but it will'be noted that such movement h as been stopped before the controller wheel 60 has turned far enough to permit such action of the bell crank 56 as to cause the main clutch to repeat. A similar result would follow the action of the pawl 88 in case the parts should tend to turn far enough to cause a premature release of the clutch and stop the machine midway of its cycle of movement. The shaft 68 would be looked, moreover, by the action of the means described in the event of accidental engagement with any portion of the mechanism tending to turnthe' shaft relatively to the pawls. Effective insurance is thus afforded against premature opcration .of the clutch and the brake to start or stop the'machine. By ad justing the nut 76 the bushing 72 may be properly positioned relatively to the bearingmember 118 to cause the roll 122to perform its function as required.

.By reference to Fig. 7 it will be seen that the brake drum 24: is eccentric'to the shaft 16 on which it is mounted, the degree of eccentricity being exaggerated in this figure for the purpose of clearer illustration of the resulting efiect. The position of the eccentric on the shaft is such with reference to the cycle of operations, that when the brake is applied through downward movement of the rod 38 the high portion of the eccentric is engagingthat portion of the brake bandwith which the rod- 38{is*"connected, as shown by'full-lines in Fig. 7 r Between the time when the brake is first ap plied and the t ime when the parts are brought to rest the drum moves from the full line position to the dotted line position shown in Fig. 7, the effect of which is "to swing/the entire brake band about its an chorage on the arm 28 and thus turn the bell crank 34 relatively to the rod 38,"which is stationary at this time in such manner as to tighten the band still further. The brake is thus applied preliminarily by the action of the rod 38, and the braking action is in creased automatically throughthe movement ofv the driven mechanism. Accidental failure of the brake to 'work properly is thus guarded against under all usual working conditions. The brake mechanism dis closed herein is not claimed-in this'application but is made the subject-matter of a divisional application, Serial No. 393,598, filed July 2,1920.

Should the brake band become loose through wear and need tightening, as by shortening the link 36, it is important that the operator recognize the condition promptly, since if the eccentrics let a're permitted to pass much beyond the upper deadcenter position, there is danger that the weight of the beam combinedwith the momentum of the parts may lead-toa partial repetition of the operative movements of .the machine such as to cause the beam todescend' again to its lowermost position. This invention provides effective means for warning the operator of such abnormal condition of the brake. To this end, the controller shaft'68 carries a ratchet wheel 132 (Figs. 2 and 5) and co-operating with the teeth of this wheel is a catch 18 1 which is pivoted on a bracket 136 on one of the frame castings 2 and is operated by a'cam 138 on the main shaft 16 through'c'onnections comprising an arm 140 pivoted on the casting 136 at right angles to the axis of the catch 134. vThe arm 140 is provided with a cam 14:2 which operates to lift the catch 13 1 from engage-' ment with the wheel 132 when the arm 140' is swung by the cam 138 to the'po'sition shown in Fig. 5. 'The parts shown in Fig. 5 are in the positions which they assume when the machine is stopped in its normal position of rest, and thecatch 134 opposes no obstruction to the movement ofthe con troller shaft 68 to start the machine. In the event, however, that the-shaft 16should turn slightly beyond its normal position of rest by reason of failure of the braketo perform its function properly, the arm 140 would beireleased by the cam 138 and the catch 134 would 'be "permitted to drop into engagement with thefwheel 182, thusfp'reventing'movement of the shaft- 68 by the treadle. The; mechanism shown in Fig.- 5

thus serves as av tell' tale to warnthe oper ator the brake requires adjustment. After" proper adjustment of'theqbrake-"h'as been effected the catch may be'lifted by hand to permit the machine-to be started." Although a wheel 60 far enough to permit the roll 58 todrop into the next succeeding depression 62 on the wheel, thus permitting the spring 66 to act upon the rod 52 to set the clutch andre'lease the brake. The shaft 16 is thus set in motion and throughrtheeccentrics '14 and't-he pitmen 12depressesthe'rocls Stand the beam to cause the beam tol act upon the die,"and then raises the rods to return the beam to' the starting position. During the latter portion of the upward movement of the rods the pawl 116 engages the ratchet wheel 80, 82 and turns the shaft 68to carry the next succeeding cam 64 on the wheel 60 beneath the roll 58, thus operating the bell crank 56 torelease' the clutch and set the brake whereby the parts are brought to rest in starting position.

v The detailed operation of different parts of-the mechanism and the action of the dif-v ferent parts under abnormal conditions have already been'pointed out and require no further explanation.

While'the various'features of the invention,'includin'g thenovel braking means, are shownq'and described herein as applied to a machine particularly designed for cutting soles or the like, it should be understood that the invention is notthus restricted in utility but is applicable-to machines of vari'oustypes. Having described thev invention, what I claim'as new and desire to secure by Letters Patent of the United Statesis:

-1. In a machine'of the -class described, the combination with .dniven' mechanism, drivingmeans, and a'clutch for connecting the driven mechanism to the driving means, of clutch operating means complrising a member IIiOv'able in'successive steps to cause the clutch to be alternately setand released, means for operating said member, the member being movable also relatively" to its operatingmeans, and means for positively lockingthe, member against such movement relatively to its operating means aswould cause an operation ofthe clutch.

2. In a machine of-the class. described,

the. combination with driven .mechanism,

driving means, and a clutch for connecting the driven mechanism to the driving means, of clutch operating means comprising a member movable in successive steps to cause theclutch to be alternately set and released, means for operating said member, the mem ber being movable also relatively to its operating means, and means operative upon a movement of the member. relatively to its operating means for locking the member said member to eiiect the release of the.

clutch, the member being movable also relatively to its operating means, and means for positively locking the member against such movement relatively to its operating means as would cause the clutch to beset a second time. J v Q a. In a machine of the class described, the combination Withdriven mechanism, driving means, and a clutch for connecting the driven mechanism to the driving means, of clutch operating means comprising a member movable in successive steps to cause the clutch to befalternately set and re leased, means for operating said member comprising a ratchet wheel and a pawl for turning said wheel,. and means operative upon a movement of said member independently of the pawl torlocking the member against movement.

5. In a machine of the class described, the combination with driven mechanism, driving means, and a clutch for connecting the driven mechanism to the driving means, of clutch operating means comprising a mem ber rotatable in successive steps in the same direction to cause the clutch to be alternately set and. released, means for rotating said member comprisingv a ratchet wheeland a pawl movable to turn said wheel, and a clutch for locking said member against movement tending to carryatooth of the ratchet wheel beyondthe range of action ofthepawl.

' 6. In a machine of the class described, the combination with driven .mechanism, driving means, and a clutch for connecting the driven mechanism to the driving means, of clutch. operating means comprising a member movable in successive steps to cause the clutch to be alternately set and released, means for operating said member compris ing'a ratchet wheel and a pawl movable to turn said wheel, and a clutch for looking or releasing-said member constructed and arranged to be operated to release the member through the action of said pawl.

lock said member against rotation, and

means for rotating the member constructed and arranged to cause the member to be unlocked during the 'actiono t said means on the member.

8. In a machine of the class described, the combination with driven mechanism, driving means, and a clutch for connecting the driven mechanism to the driving means, of clutch operating means comprising a member rotatable in successive steps in the same direction to cause the clutch to be alternately set and released, a ratchet wheel rotatable'with' said member, said Wheel being divided in a plane transverse to its to permit limited turning movement of one portion relatively to the other portion, yielding means tending to maintain the relatively movable portion of the ratchet wheel with its teeth out of alinement with the teeth of the other portion, means operative through said relatively offset relation of the two portions of the ratchet wheel. to prevent turning movement of the wheel, and a pawl for turning the wheel and Said member, said pawl being initially operative to aline the teeth and releasethe wheel.

9. In a machine of the class described. the combination with driven mechanism, driving means, and a clutch for connecting the driven mechanism to the driving means, oi

clutch operating means comprising a member rotatable .in'successive steps to cause the clutch to be alternately set and released, treadle operated means for turning said member to cause. the setting of the clutch, a loclrfor preventing. overthrow of said rotatable member, andmeans operated by the driven mechanism for turning the memher to cause the release of the clutch.

10.111 a machine of the class described. the combination with driven mechanism, driving means, and a clutchfor connecting .thedriven mechanism to the driving means,

of clutch operating means comprising a member movable in successive steps to cause the clutch to be alternately set and released, a ratchet wheel for moving said member, a pair of reciprocable pawls operative alternately to effect successive turning movements of said wheel, a treadle for operating one of the pawls, and connections to the driven mechanism for operating the other pawl.

11. In a machine of the class described, the combination with driven mechanism comprising a reciprocating part, driving means, a clutch for connecting the driven mechanism to the driving means, and a brake for stopping the movement of the driven mechanism, of means connecting the clutch and the brake to cause them to operate in time relation, and means for controlling the operation of the clutch and the brake comprising a member rotatable in successive steps to cause alternate starting and stopping of the driven mechanism, treadle operated means for turning said member through one step, and means movable with said reciprocating part of the driven mechanism for turning the member through the succeeding step.

12. In a machine of the class described, the combination with a driving shaft, of a clutch at one end of the shaft for connecting the shaft to a source of power, a brake at the other end of the shaft, connections between the clutch and the brake comprising a rod extending longitudinally of the shaft, a controller shaft extending transversely of the driving shaft, a controlling member on said last named shaft, and connections between said member and rod to cause alternate movements of the rod in opposite directions through successive movements of the controlling member in the same direction, treadle operated means for imparting one movement to said member, and means operated by the driving shaft for imparting the succeeding movement to the member.

13. In mechanism of the classdescribed, the combination with a clutch, a brake, means connecting the clutch and the brake, and a spring tending to set the clutch and release the brake, of a rotatable cam wheel, connections between said wheel and the means connecting the clutch and the brake to cause the clutch to be released and the brake to be applied through a movement of said wheel. power operated means for imparting said movement to the wheel, and manual means for turning said wheel into position to permit the spring to set the clutch and release the brake.

14. In mechanism of the class described, the combination with a shaft, a clutch for connecting the shaft to a source of power and a brake for stopping the rotation of the shaft, of means for setting the clutch and releasing the brake and for subsequently releasing the clutch and applying the brake to stop the rotation of the shaft, said means comprising a controlling member and man ual means for operating said member to render the clutch operative and release the connecting the shaft to a source of power and a brake for stopping the rotation of the shaft, of means for sett'ing the clutch and releasing the brake and for subsequently releasing the clutch and applying the brake to stop the rotation of the shaft, said means comprising a controlling member movable in successive steps in the same direction to effect said successive movements ,of the clutch and the brake, and means for locking said controlling member to prevent a subsequent operation of the clutch in case the shaft turns beyond its normal position of rest.

16. In a machineof the class described, the combination with a shaft, a clutch for connecting the shaft to a source of power and a brake for stopping the rotation of the shaft, of means for setting the clutch and releasing the brake and for subsequently releasing the clutch and applying the brake to stop the movement of the shaft at the end of a single revolution, said means comprising a controlling member rotatable in successive steps to effect said successive movements of the clutch and the brake, and means for locking said member against fur ther operative movement upon the starting of'the shaft and for releasing said member as the. shaft completes its revolution.

17. In mechanism of the class described, the combination with a driving shaft, a clutch for connecting the shaft to a source of power, and a brake for stopping the rotation of the shaft, of means for setting the clutch and releasing the brake and for subsequently releasing the clutch and applying the brake to stop the movement'of the shaft at the end of a single revolution, said means comprising a controlling member rotatable in successive steps to efi'ectsaid successive movements ofthe clutch and the brake, a ratchet wheel rotatable with said controlling member, a catch arranged to engage said wheel to prevent operative movement of said member, and means for maintaining said catch out of engagement with said wheel when said driving shaft is in a normal position of rest and for causing the catch to engage the wheel when the shaft turns beyond its normalposition of rest.

18. In a machineof the class described, a shaft, a clutch for connecting the shaft to a source of power, a brake for stopping the rotation of the shaft, mean'scomprismg a slidabl-e bar for connecting the brake and clutch, a spring and a rotatable member for operating the bar to effect setting of the clutch and releasing of the brake and subsequently releasing of the: clutch and applying of the brake, and a lock located in the rotatable member to prevent overthrow of the rotatable member whereby improper actuation of the clutch is prevented.

19. In a machine of the class described, the combination with a shaft, apower pulley on the shaft, and a clutch for connecting the shaft and pulley, of means for operating the clutch comprising a rotatable cam member, a lever having a roll engaging the cam member and having connections with the clutch, manually operable means comprising a pawl for turning the member 7 to operate the lever, and a lock controlled by the rotatable member for preventing such overthrow of the latter as would cause an operation of the clutch.

20. In a machine of the class described, the combination with a shaft, a power pulley on the shaft, and a clutch for-connecting the shaft and pulley, of means for operating the clutch comprising a member movable in successive steps to cause the clutch to be alternately set and released, a pawl and ratchet mechanism for operating said member, and a lock for preventing overthrow of said member so as to insure against such movement of the member as would cause the clutch to be set a seconc time.

In testimony whereof I have signed my name to this specification.

WILLIAM G. STEWART.

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