US2633219A - Brake mechanism for paper-cutting machines and the like - Google Patents

Description

March 31, 1953 w. c. RUPP 2,633,219 BRAKE MECHANISM FOR PAPER-CUTTING MACHINES AND THE LIKE Filed Aug. 27, 1949 2 SPEETS--SHEET l INVENTOR.

M1. LIAM c. EUPP .2 owih lmvlwl March 31, 1953 w c RUPP 2,633,219 BRAKE MECHANISM FOR PAPER-CUTTING MACHINES AND THE LIKE Filed Aug. 27, 1949 2 SHEETS-SHEET 2 INVENTOR. W/L LIA/1 c.1214

ATTQILNEYS' Patented Mar. 31, 1953 BRAKE MECHANISM FOR PAPER-CUTTING MACHINES AND THE LIKE William C. Rupp, Parma, Ohio, assignor to The Chandler & Price Company, Cleveland, Ohio,

a corporation of Ohio Application August 27, 1949, Serial No. 112,659

1'7 Claims.

This invention relates as indicated to a novel brake mechanism and more particularly to such mechanism especially adapted for use in conjunction with power driven machines where it is desired that the operation of the machine be automatically stopped at the conclusion of a cycle. The embodiment of such invention described in detail below is particularly arranged and designed for use in a power driven paper cutting machine, but it will be understood that my new mechanism is also adapted for use in forging machines and the like where similar automatic control is desired.

Power driven paper cutting machines have long been employed for the purpose of cutting and trimming stacks of paper sheets and their construction has become fairly well standardized. Generally, such machines comprise a bed or table upon which a stack of sheets may be precisely positioned by means of adjustable gauges and a vertically reciprocable knife which is drawn down and again elevated by means of a power driven crank. Since it is generally necessary for the operator to manually position the stacks of sheets to some degree on the table, it is of considerable importance that the machine should not be accidentally actuated during such preliminaries as otherwise very serious accidents may result. It is also important that after completion of a cut the knife should return to fully elevated position and remain there. Otherwise, the operator may be endangered and also, if the knife has started again to descend, there may not be sufficient clearance for removal of the stack of sheets and insertion of a new stack.

It is therefore a primary object of my invention to provide means which will positively prevent the contingency of the machine from overrunning and making more than one cut.

Another object is to provide operating control means which must be moved in two different directions in sequence to operate the drive mechanismso that the knife cannot be accidentally actuated.

Other objects of my invention will appear as the description proceeds.

To the accomplishment of the foregoing and related ends, said invention then comprises the features hereinafter fully described and particularly pointed out in the claims, the following description and the annexed drawing setting forth in detail certain illustrative embodiments of the invention, these being indicative, however, of but a few of the various ways in which the principle of the invention may be employed.

In said annexed drawing:

Fig. 1 is a front elevational view of a paper cutting machineembodying my invention;

Fig. 2 is a detail drawing of the drive unit assembly including my novel cycle control mechanism;

Fig. 3 is a detail view similar to Fig. 2 but showing the position of the parts of such mechanism when the control lever has been preliminarily moved in one direction;

Fig. 4 is another view similar to Figs. 2 and 3 showing the position of such parts after such lever has next been moved in the opposite direction to initiate reciprocation of the knife;

Fig. 5 is a vertical sectional view taken along the line 55 on Fig. 4; and

Fig. 6 is an end elevational view of the drive unit shown in Fig. 2.

General construction Referring now more particularly to said drawing, the new brake mechanism of my invention may be incorporated in a paper cutting machine of generally conventional construction comprising a base frame I carrying a bed or table 2 on which a stack of sheets may be positioned to be cut. A back gauge 3 may be adjusted rearwardly or forwardly of table 2 by means of hand-wheel 4, the position of such gauge being indicated by a traveling steel tape in window 5 as described in Reichart Patent No. 2,203,547. A knife bar 6 carrying knife 1 is mounted for generally vertical reciprocation in upper frame 8 and a binder clamp 9, the lower portion of which protrudes below knife 1 in Fig. l, is adapted to be raised and lowered by means of an electric motor [0 to clamp the stack of sheets tightly until the out has been completed and the knife withdrawn. A preferred form of binder clamp is illustrated and described in my co-pending application Serial No. 60,341, filed November 16, 1948. Back gauge 3 after being adjusted by means of hand-wheel 4 may be locked in adjusted position by locking leve II.

The knife bar 6 is suspended in uppen frame 8 by means of links I2 and I3 so that when the knife is brought down it will make a sliding out from right 'to left as viewed in Fig. 1. An angularly upward extension [4 of link I3 is pivotally connected to crank l5 by means of connecting rod is. Crank I5 is keyed to crankshaft I! and driven thereby to reciprocate knife bar 6 and knife 1 as described below.

The drive unit installed in or removed from the base I of the machine to facilitate adjustment or repair. The main drive shaft 59 is journalled in bearing at one end of frame member I3 and carries a flywheel 2| and drive pulley 22 freely rotatably mounted thereon. Such flywheel is joined to such pulley for rotation therewith when .the latter is driven by a conventional electric motor and belting (not shown). A worm gear 23 is keyed to shaft I3 to drive Worm wheel 24 keyed to crankshaft Il within gear case 25.

A disc clutch 25 of well-known construction is provided releasably to engage flywheel 2| in driving relationship with drive shaft I9, such action being effected by shifting of cone 2'! to the right as viewed in Fig. 2 to spread clutch actuating fingers 28.

The disc type brake 29 is operative tostop rotation of shaft I9 when actuated by shifting of cone 30 to the left as viewed in Fig. 2 to spread brake actuating fingers 3 5.

"Referring now. more particularly to Fig. 5 of the drawing, it will be understood thatthe two cones 27 and 39 are joined by a sleeve 32 of lesser diameter forming a peripheral groove 33 in which are engaged the shifting shoes 34 and 35 of yoke '36. Such yoke is keyed to clutch operating shaft '31 so that when such latter shaft is rocked'to rock yoke '36 to the left as viewed in Fig. 2 the flywheel 2| will be disengaged and brake 29 engaged, and when rocked to the right as shown in Fig. 4 the flywheel "will be engaged in driving connection with shaft I9 and brake 29 will be disengaged. A hand operating lever 38 is keyed to shaft 3'! thus to rock the same.

The cycle control mechanism A collar 39 is freely rotatably 'mounted on crankshaft I1 and provided with an abutment 40 for a purpose explained below. A brake operating lever 4i keyed to shaft 3? is pivotally eccentrically connected to collar 39 at "42 by means of a longitudinally adjustable link 43. A lost motion connection between such link and lever 4| is provided bymeans of a slot '44 in the end of such link in which stud 45 on the end of lever 4| is slidably engaged.

A dog 46 is keyed to crankshaft I'I for'rotation therewith and is adapted to engage abutment 48 on collar 39 to carrysuch latter collar with it as such shaft rotates.

Operation .Aftera stackof sheets has been properlypositioned .on table 2 against back gauge 3, the oper .ator first moves clutch lever 38 to the right as viewed in Fig. l or to the left as viewed in.Fig. 2. Such .movement of the lever causes the latter .to operate microswitch 47 completing a circuit initiating downward movement of binder clamp .9. It will be seen, therefore, that such clamp starts its downward movement before the knife is actuated, insuring that the stack of sheets will be firmly clamped-before the-knife descends. While brake .29 is already on, it will be apparent as shown in Fig. 2 that cone 3d may still be shifted slightly more tothe left with very little additional spreading 'of brake actuating fingers 3I. Such rocking .of shaft 3'6, moreover, rocks lever 4| sufficiently in a counterclockwise direction as shown inFig. 3 to permit link 43 suflicient play so that eccentric connection 42 of :such link with collar 39 may drop past the center line of crankshaft It is therefore now possible to rock lever ti in a'clockwise direction which the opera- .tornext accomplishes by shifting control lever38 .to drive shaft I9.

from right to left as viewed in Fig. 1 or from left to right as viewed in Figs. 2, 3 and 4. Clutch operating shaft 3! consequently rocks yoke 36 from left to right as viewed in such latter figures, disengaging brake 29 and engaging flywheel 2| Rotation of shaft 19 turns worm 23 and worm wheel 24 to rotate crankshaft I! and crank I5 to reciprocate connecting rod I6 and therefore knife 1. Dog 46 picks up abutment 40 as it turns with shaft I1 and carries collar 39 with'i't (Fig-4)..

When crankshaft I1 has revolved sufficiently (one complete revolution) to return crank I5 to Fig. 2 position (thereby likewise again elevating vtheknife toits uppermost position), dog 46 bearing against abutment 49 will have rotated collar 39 to draw link 43 into engagement with stud 45 on brake operating lever 4|. Such latter lever will as a result have been rocked in a counterclockwise direction into Fig. 2 position, thereby likewise rocking ,yoke 36 to disengage flywheel 2| and apply brake 29. The length of link 43 is, of course, adjusted to insure that lever M will "have been rocked suflicientlypositively to apply brake 29 to stop rotation of shaft I9 before the center line of eccentric-connection 42 of such link passes the center line of crankshaft l7. In other words, any final tendency of crankshaft I! to continue rotation once the mechanism has reached the Fig. 2 position merely serves, through engagement of dog 4'6'with abutment 43, to draw link 43 tighter and apply brake 29 more firmly. There is, therefore, no possibility of knife 1 repeating the cut or even passing the uppermost point in its reciprocation.

.A'cam-48 turning with shaft I 1 is adapted to operate a 'microswitch 50 after return of the knife :to cause binder clamp 9 to be elevated, all asm'ore fully disclosed in my 'cop'ending application Serial No. 60,341. Since clutch operating lever 3811s keyed to shaft 31, itwillof course also have been returned to starting position. As above described, the next cycle of operation cannot, .however, be initiated until such lever has been manually rocked sufiiciently to permit eccentric connection 'of'link -43 to collar39 to drop under thein'fiuenceof gravity, causing the center line of such .linkto :drop below the center line of crankshaft I].

Dog 36 .is,;of course, keyed to shaft il in proper position relative to crank I5 so that such dog willcause link .43 to'be pulled to apply the brake whenthe crankhasreturned the knife to uppermost -.or rest position. The entire mechanism is relatively simple and inexpensive of construclllOll but positive and reliable 'in operation. It IS also very easy to adjust. Link 43 and collar 39 in effect constitute .a :toggle arrangement looking the machine against further operation until intentionally released by the operator. It is im possible to move clutch operating lever to disengage the brake and engage the flywheel until the -opera'tor has first rocked such lever in the opposite direction to permit eccentric collar 39 to turn enough to drop the-center line of eccentric connection 42 of link 43 below the center line of crankshaft I 5.

The gearing '23, 24, may be of the irreversible type although this is not necessary. When the machine has been stopped by brake 29 there is insufficient leverage applicable on the eccentric to permit the operator to shift lever 33 to disengage the brake without first rocking the same to bring the point of pivotal connection of link 43 andsuch eccentric past dead center, since this would otherwise require reverse rotation of crankshaft l1.

While, in the specific mechanism described by Way of illustration of my invention, I have shown the elements so arranged and adjusted that eccentric 39 will turn past dead center under the influence of gravity when lever d! is manually rocked theretoward, it is of course obvious "that 'a. spring may be provided to supplement or replace reliance on gravity for this purpose.

Clutch operating rocker shaft 31 has three levers keyed thereto, namely hand operating lever 38, shifting yoke 35, and lever 4|.

but the functions of such various levers could be combined, if desired. The provision of a turnbuckle or like means for adjusting the features statedin any of the following claims or the equivalent of such be employed.

I thereforeparticularly point out and distinctly claim as my invention:

1. In drive means for paper cutting machines and the like wherein it is desired to turn a crank through one cycle only until another cycle is initiated by theo-perator; a crank, a crankshaft to-which said crank is keyed, a drive shaft, worm gear means connecting said crankshaft and drive shaft for driving the former by the latter, a disc type clutch on said drive shaft, a disc type brake on said drive shaft, a flywheel rotatably mounted on said drive shaft, a double cone mounted for reciprocation longitudinally of said drive shaft and adapted when shifted in one direction to apply said brake and when shifted in the other direction to engage said clutch for driving said drive shaft by said flywheel, means for driving said flywheel, a yoke engaging said double cone and mounted for rocking action to reciprocate said cone, a hand operating lever operative thus to rock said yoke to shift said cone, a rocker arm operative, when rocked, to rock said yoke therewith, an eccentric freely rotatably mounted on said crankshaft, a longitudinally adjustable link pivotally connecting said eccentric and said rocker arm, such connection with said rocker arm including provision for lost motion, said link thereby engaging said rocker arm to rock said arm to shift said cone to apply said brake but being ineffective to rock said arm to shift said cone to engage said clutch when said eccentric is rotated, an abutment on said eccentric, and a dog keyed to said crankshaft adapted to engage said abutment to rotate said eccentric therewith, the length of said link being adjusted to rock said arm to apply said brake and disengage said flywheel when such eccentric connection of said link has thus been carried around such crankshaft to a point nearly but not quite diametrically opposite the pivotal connection of said link and arm, further operation being thereby prevented until said hand operating lever is manually rocked to apply said brake still more firmly and incidentally thereto rocking said rocker arm sufficiently toward said crankshaft to permit such eccentric connection to drop by gravity past such diametrically opposite point, whereupon the operating cycle may now be initiated by moving This has been found to be a convenient arrangement 6 said hand operating lever to disengage said brake and re-engage said clutch.

2. In drive means for power driven paper cutting machines and the like having a crank adapted to be turned to operate such machine; a crankshaft to which such crank is secured for rotation therewith, a drive shaft disposed at right angles to said crankshaft, worm gear means connecting said crankshaft and drive shaft for driving the former by the latter, a disc type brake on said drive shaft, a flywheel mounted for rotation on said drive shaft spaced from said brake, a disc type clutch adapted to engage said flywheel for rotation with said drive shaft, shifter means interposed between said brake and clutch adapted when moved in the direction of said crankshaft longitudinally of said drive shaft to engage said brake and disengage said clutch and when moved in the opposite direction to release said brake and engage said flywheel in driving engagement with said drive shaft, a rock shaft disposed at right angles to said drive shaft, a rocker arm secured to said rock shaft operative thus to move said shifter means, a hand operating lever secured to said rock shaft to rock the latter, a second lever secured to said rock shaft likewise operative to rock the same, an eccentric freely rotatably mounted on said crankshaft, a link pivotally connecting said eccentric and said second lever, said link including provision for lost motion permitting rocking of said second lever toward said crankshaft without opposition of saidlink, and a dog on said crankshaft adapted to engage said eccentric for rotation therewith, said link being effective, when the pivotal connection of said link and eccentric has been thus carried around said crankshaft to a point nearly but not quite diametrically opposite the pivotal connection of said link and second lever, automatically to rock said second lever to rock said rocker arm to apply said brake and disengage said flywheel, further operation being thereby prevented until said hand operating lever is manually rocked to apply said brake still more firmly and incidentally thereto to rock said second lever sufiiciently toward said crankshaft to permit such pivotal connection of link and eccentric to drop past such diametrically opposite point, whereupon the operating cycle may now be initiated by moving said hand operating lever in the opposite direction to disengage said brake and re-engage said flywheel.

3.- In drive means for poweroperated machines of the type in which a crank is employed 'to reciprocate a work-engaging instrument, such as paper cutting machines, forging machines, and the like, the combination of a crankshaft to which such crank is secured for rotation therewith, a drive shaft disposed at right angles to said crankshaft, gear means connecting said crankshaft and drive shaft for driving the former by the latter, a brake on said drive shaft, a flywheel mounted for rotation on said drive shaft spaced from said brake, a clutch adapted to engage said flywheel for rotation with said drive shaft, a rock shaft disposed at right angles to said drive shaft, a rocker arm on said rock shaft operative when rocked in one direction toward said crankshaft to engage said brake' and disengage said clutch and when rocked in the opposite direction to release said brake and engage said flywheel in driving engagement with said drive shaft, a lever secured to said rock shaft, an eccentric freely rotatably mounted on said crankshaft, a link pivotally connecting said eccentric and :said ilever, .said link including pro-- vision for lost motion in .its pivotal connection with said lever permitting rocking .of .said lever toward crankshaft without opposition of said link, and 'a dog on said crankshaft adapted to engage said eccentric for:rotation therewith, said link being effective, when the pivotal connection of said link and eccentric has been thus carried around said crankshaft to a point nearly but not quite diametrically opposite the pivotal connection of said link and lever, automatically to rock said lever to rock said rocker arm to apply said brake and disengage said flywheel, further operation being thereby prevented until said lever is manually further rocked in the same direction to apply said brake still more firmly .and incidentally thereto permit such pivotal connection of :link and eccentric to pass such diametrically opposite point, whereupon the operating cycle may now be initiated at will byrockingsaid rocker arm in the opposite direction to disengage said brake and vre-engage said flywheel.

4. In drive means for power operated machines of the type in which a crank is employed to reciprocate a work-engaging instrument, such as paper cutting machines, forging machines, and the like, the combination of a crankshaft to which such crank is secured for rotation therewith, a drive shaft, means connecting said crankshaft :and drive shaft for driving the former by the latter, a brake for said drive shaft, a fly wheel adapted to drive said drive shaft, a clutch operable "to engage said flywheel and drive shaft for driving thelatterand to disengage the same, and means operative to engage said brake and operate said clutch .to disengage said flywheel and alternatively to disengage said brake and operate said clutch to engage said flywheel comprising shifter vmeans, a lever operative to: shift said shifter means, an eccentric freely rotatably ,1

mounted on said crankshaft, a link pivotally connecting said eccentric and lever, said link including provision for lost motion in its connection with said lever permitting rocking of said lever toward said crankshaft without opposition of said link, and a dog fixed on said crankshaft adapted to engage said eccentric for rotation therewith but leaving said eccentric free to rotate in advance thereof, said link being of a length effective, when the pivotal connection of said link andeccentric has been thus carried around said crankshaft to a point not quite diametrically opposite the connection of said :link and lever, automatically to rock said lever to apply :said brake and disengage saidfiy- 7 wheel, further operation being thereby prevented until said lever is further rocked in the same direction to permit such pivotal connection of link and eccentric to pass such diametrically opposite point.

i 5. In drive means for power operated machines of the type in which a crank is employed to reciprocate a work-engaging instrument, such as paper cutting machines, forging machines, and the like, the combination of a crankshaft to which such crank is secured for rotation therewith, .a brake operative to stop said crankshaft, a flywheel adapted to-drive said crankshaft, lever means operative to engage said brake and disengage ;said flywheel and alternatively to disengage said brake and engage said flywheel 'to drive said crankshaft, a freely rotatably mounted eccentric, a link pivotally connecting said eccentric and lever whereby said 'lever may be rocked to engage said brake and disengage said adapted to engage said eccentric to -rotate the latter in synchronism with said crankshaft but leaving said eccentric free to-rotate in advance thereof, said link being of a length effective, when the pivotal connection of said link and eccentric has been thus carried around to a point not quite diametrically opposite the connection of said link and lever, automatically to rock said lever to apply said brake and disengage said flywheel, whereupon a new cycle may be initiated only after first further rocking said lever in the same direction sufiiciently to permit such connection of link and lever to pass such diametrically opposite -point.

6. In a single-cycle drive means for power operated machines having a crankshaft, a brake operative to stop such crankshaft, power means operative to drive such crankshaft, and means operable to apply such brake and disconnect such power means and alternatively to release such brake and connect such power means in driving relationship with such crankshaft; the combination of automatic control means comprising a lever adapted when rocked 'in opposite directions thus to regulate such alternative application of brake and power, an eccentric, means connecting said lever and eccentric adapted to rock said lever to apply said brake and disconnect said power means as said eccentric turns, and means on said crankshaft adapted to engage said eccentric and automatically operative during each revolution of such crankshaft to turn said eccentric with such crankshaft 'for a portion only of such revolution, said eccentric being mounted for rotation'freely in advance of such eccentric engaging means, said connecting means being thereupon effective to rock said lever sufficiently to apply said brake and disconnect said power means before passing the center of rotation of said eccentric, whereupon 'a new cycle may be initiated only after first'further rocking said'lever in the same direction sufficiently to permit such eccentric 'to rotate further to cause said connecting means to pass the center of rotation thereof.

'7. In single-cycle drive means for power operated machineshavinga rotatable shaft, a brake operative to stop such shaft, power means operative to drive such shaft, and means operable to apply such brake and disconnect such power means and alternatively to release such brake and connect such power means in driving relationship with such shaft; the combination of automatic control'means comprising an eccentric adapted to "be driven together with said shaft but mounted for rotation relative thereto so as to'be always free to 'turn in advanced saidshaft, and control means pivotally connected to said eccentric and adapted to be 'reciprocated thereby to apply such brake and disconnect such power means shortly before the point of pivotal connectionpasses dead center of said eccentric, whereupon a new cycle may be initiated only after first moving said pivotally connected control means to permit said eccentric to continue rotation suihoiently to bring such point of pivotal connection past dead center without corresponding further rotation of said crankshaft.

8. Ina power operated machine having a rotatable element and a brake operative to stop the same; means operative automatically to apply such brake comprising an eccentric, means operative to drive said eccentric with said element but mounted to permit continued rotation of said 9 eccentric relative to said element whenever said element is stopped, and control means for such brakepivotally connectedto said eccentric and adaptedto be reciprocated thereby to apply such I and brake means therefor, a freely rotatably mounted eccentric, means on such element adapted to engage and push said eccentric to rotate the same therewith, said eccentric being mounted for free rotation in advance of rotation of such element at all times, and a link pivotally connected to said eccentric and arranged to be reciprocated thereby to apply such brake shortly before the point of pivotal connection passes dead center of said eccentric, whereupon a new cycle of operation may be initiated only after moving such. point of pivotal connection beyond dead center to permit such brake to be released.

10. In mechanism including a rotatable element adapted to be rotated in one direction only and brake means therefor, a freely rotatably mounted eccentric, means on such element adapted to engage said eccentric to rotate the same therewith, said eccentric being mounted for free rotation at all times in advance of rotation of such element without restraint by said means on such element, and a link pivotally connected'to said eccentric and adapted to be reciprocated thereby to apply such brake shortly before the point of pivotal connection passes dead center of said eccentric, whereupon a new cycle of operation may be initiated only after manually moving such point of pivotal connection beyond dead center to permit such brake to be released.

11. In mechanism including a rotatable element, drive means therefor, and a clutch for engaging such drive means in and disengaging such drive means from driving relationship with such element; means operative automatically to disengage such drive means comprising an eccentric mounted to be driven together with said element, means operative thus to drive said eccentric with said element without restraining said eccentric against further rotation in the same direction when said element is stopped, and control means for such clutch pivotally connected to said eccentric and adapted to be reciprocated thereby to disengage such clutch before the point of pivotal connection passes dead center of said eccentric, whereupon such clutch may be again engaged only after moving such point of pivotal connection beyond dead center by further rotation of said eccentric while leaving said rotatable element stationary.

12. In mechanism including a rotatable element, drive means therefor, and a clutch for engaging such drive means in and disengaging such drive means from driving relationship with such element; means operative automatically to disengage such drive means comprising a freely rotatably mounted eccentric, means on such element adapted to engage said eccentric to rotate the same therewith, said eccentric being mounted and arranged at all times for rotation in advance of rotation of such element, and a, link pivotally connected to said eccentric and adapted to be reciprocated thereby to disengage such clutch shortly before the point of pivotal connection passes dead center of said eccentric, whereupon such clutch may be again engaged only after moving such point of pivotal connection beyond dead center by further rotation of said eccentric while leaving said rotatable element stationary.

13. In mechanism including an element rotatable in one direction, means operative to prevent rotation of such element in the other direction, drive means for such element, and a clutch for engaging such drive means in and disengaging such drive means from driving relationship with such element; means operative automatically to disengage such drive means comprising a freely rotatably mounted eccentric, means on such element adapted to engage said eccentric to rotate the same therewith, said eccentric being mounted and arranged for relative independent rotation in advance of rotation of such element, and a link pivotally connected to said eccentric and adapted to be reciprocated thereby tooperate such clutch to disengage such drive means before the point of pivotal connection of said link and eccentric passes dead center of said eccentric, whereupon such clutch may be operated to again engage such driving means only after first moving such point of pivotal connection beyond dead center.

14. In mechanism including a crankshaft rotatable in one direction only, a flywheel. adapted to drive such crankshaft, and a clutch operative to engage such flywheel in and disengage such flywheel from driving relationship with such crankshaft; means operative automatically to disengage such flywheel comprising a freely rotatably mounted eccentric, means on such crankshaft adapted to engage said eccentric to rotate the sametherewith, said eccentric being at all times free for independent rotation in advance of rotation of such element, and a link pivotally connected to said eccentric and adapted to be reciprocated thereby to operate such clutch to disengage such flywheel before the point of pivotal connection of said link and eccentric passes dead center of said eccentric, whereupon such clutch may be operated to again engage such flywheel only after such point of pivotal connection has first been moved beyond dead center.

15. In drive means for power driven paper cutting machines and the like having a crankshaft, abrake for such crankshaft, a flywheel adapted to drive such crankshaft, and a clutch operative to engage such flywheel in and disengage such flywheel from driving relationship with such crankshaft; means operative automatically to apply such brake and disengage such flywheel after completion of one cycle of such machine comprising a freely rotatably mounted eccentric, means on such crankshaft adapted to engage said eccentric for rotation therewith, a lever operative when rocked in one direction to engage such brake and operate such clutch to disengage such flywheel and when rocked in the opposite direction to release such brake and operate such clutch to engage such flywheel, and a link pivotally connecting said lever and eccentric having a length effective to rock said lever to apply such brake and I disengage such flywheel shortly before the point of pivotal connection of said link and eccentric reaches dead center relative to said eccentric, whereupon a new cycle may be initiated only after first further rocking said lever in the same direction sufiiciently to permit such connection of link and lever to pass dead center.

16. In drive means for power driven paper cutting machines and the like having a crankshaft, a brake for such crankshaft, a flywheel adapted to drive such crankshaft, and a clutch operative to lili engage: such" flywheel in and disengage such flywheelxfrom. driving relationship with such crankshaft, means operative automatically to apply such brake and disengage. such flywheel after. completionof one cycle of such machine comprising a; freely rotatable eccentric mounted on such crankshaft, means mountedfor'rotation with such crankshaft adapted to engage said eccentric to rotate the latter therewith, a lever operative when rockedin: one directionto engage such brake and operate such clutch to disengage such flywheel and when ro'ckedin the opposite direction to release such brakeand. operatesu'ch' clutch to engage such flywheel, and a linlcpivotallyconne'ctirIg' said lever andeccentric having a length eff ec tiveitoirock saidlever toapplysuch brake and disengage such flywhe'el shortly before-the point: of pivotal connection of said link and eccentric reaches dead. center" relative to said. eccentric, whereuponaa new cycle'may be-initiate'd only'after first? further rocking: said leverinthe same direc-- tionsufiiciently to permit the pivotal connection ofisaidllinktand.eccentric to pass dead center and thereby still further to apply such brake before said lever can then be rocked in the opposite direction: to release such brakes 1 7 In asingle-cycle drive means for: power operatedzmac'hine's having a rotatableshaft, abrake operative to stop such shaft', power means operative to drive such: shaft, and manual lever means operable when. rocked in one direction to apply such brake: and disconnectisuch power means and alternatively, when rocked in the other direction, to release such brake: and connect such power means in. driving relationship with such shaft; the combination. of; automaticcont'rol means comprising anv eccentric adapted to: be: driven. together with: such. shaft but mounted for rotation relative thereto so as to-loe alwaysfree to turnin advance of such shaft, and operating means pivotally'cone nected to saideccentric and adapted to he; reciprocated. thereby to rock: said lever and apply such brake and disconnect such. power means shortlybefore the point of. such pivotal connection passesv dead center of said eccentric,v whereupon a: new cycle can be initiated. only after. first. manually rocking such lever. further in the same direction to move said pivotally connected operatingmeans.

to-permit further rotation of said eccentric-inde-- pendently of such shaft su-fficiently to bring; such pointof pivotal connection pastdead center when said lever may now be rocked in the other direction to releasesuch brake-andconnect-such power means to initiate a new cycle.

WILLIAM. c. more;

REFERENCES CITED The following references are? of record in the file of this. patent:

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