US2096165A - Rounding machine - Google Patents

Description

Oct. 19, 1937.

H. E. ELLIOTT ET AL ROUNDING MACHINE Filed June so, 1956 2 SheecsSheet l 0 b 19, 1937. H. E. IYELLIOTT ET AL 2,096,165

ROUNDING MACHINE Filed June 50, 1936 2 Sheets-Sheet 2 Patented Oct. 19, 1937' EPAT-ENT OEFFIC 15.v L

ROUNDING MACHINE Harold Ernest Elliott and WilliamNeil Bray, Leicester, England, assignors ;to .United Shoe Machinery Corporation, Paterson, .N. ..I., a cor- .porationof New Jersey Application June .30, 1936, i Serial No. 488,214 In Great Britain September 13, 1 1935 :20 Claims.

This invention relates to machines for trimming or cutting out work-pieces'and is :particularly, but by no means exclusively, concerned with machines for thus operating upon shoesoles or similar objects. These are of the class in which a roughly shaped article to be trimmed, or a blank from which an article is to :be cut, is clamped upon a pattern, between which and a knife there is relative traversing movement during'the operation of the machine, in a path-determined by the pattern, to effect the trimming or cutting out.

In machines of the character disclosed in the specification of British-Letters PatentNo. 421177 to British United ShoeMachinery Company; Ltd,

operating such a machine, it is necessary for'the' operator tomaintain a clutch-controlling handle depressed during the whole ofthe machine-cycle. This safeguards the operators right hand. In that machine, however, no means is provided which necessitates the employment of the left hand of the operator during the machine-cycle in such a position as to guard thishand against injury.

An object of the present invention is to provide in machines of the class referred tonovel-means for controlling the power-operated mechanism, which means comprises apair of :members which necessitates the use for operating them of both hands of the operator and are positioned close together on the machine for convenient and safe manipulation. In 7 an application of "Joseph Gouldbourn and Harold E. Elliott for Letters Patent of the United States,' SeriaINo. 22,302, filed May 20, 1935, a similar organization is-disclosed and more'generically claimed.

In .order that the present invention may be more fully understood, it will now be described With reference to-the accompanying drawings, in which r Fig. 1 is a right-hand, sideelevation-oftheupper portionof the machine, indicating mainly certain clutch-operating mechanism Fig. -2 is a front elevation of the portion of the machine seen in Fig; 1;

Fig. 3 is a plan view of the machine;

Fig. 4 is a plan view, on an enlarged scaleyof the clutch-controlling mechanism, and

Fig. 5 shows certain parts seen in Fig. fl. as they appear when viewed from the rear.- A

The machine has a frame I upon which-is rotatable a table II carrying supporting and actuatingmechanism'for a rounding knife! 35,- sub- '5 stantially as disclosed in the previously men- .tioned British patent. Infthe present machine, however, 'the :table is :driven by singleespeed mechanism of the kind disclosed in application for Letters Patent of the. United vStatesherein- 10 before referredito, instead of .by'two-speed mechanism, and ithe idriving .shaft 5 of the machine extends horizontally :rearwardly of the machine instead of transversely. The knife I35 acts upon a blankjheldbetweenthe usual pattern l3! ;and E15 clamp I39 mounted upon" the frame. Secured-to 'the rear of .the frame I is a rearwardly extending bracket 3 which has a bearing for one end of the driving shaft. The forward end of the driving shaft :passesthrough the frame and is supported (g in bearingstherein. Outside the: frame, thedriv- .ing shaft ;has secured on it a bevel-pinion! which meshes with :a bevel-gearfl'onth'e under side of .the table "H. The. driving shaft 5has rotatably and slidably mounted ;on it, between its 2.2 bearing on the-bracket and theframe, .a ;pul1ey.l3. This pulley has at the. forward sidean internal cone-face l5which is caused, by:forward :movement of the pulley along theshaft, to engage with anexternal-cone-face on a member]? secured on the shaft to. causejit 1301198 driven; The fact that the driving mechanismiispositioned on the rearward end-portion of the shaft insures that the driving belt will be well removedifrbm the operator's vicinity and will offer .littleiobf struction to light falling on the operating position. The pulley I3 is :moved along 'the .driving shaft :into engagement with the 'member. H by upward movement of a wedge 19.. This-wedge has a vertical face at ,its rear 'side bearing againstlthe bracket'3 and at'its:forward si de an inclined face which engages :an :inclined face on the rear of a block 2| slidably mounted on the shaft Erotatingfreely within it; .The front vertical face of the block rests against the rear of thepulleyl3, and the wedge I 9 moves in-a-guideway in the block and thus prevents'it -from1rotating. 'The wedge is formed at the upper endiof a bar.23 (Fig.5) whichat its lower;end isipivot ally. connected totone, arm 25 of 'a wedge-actuatinglever secured to the rear end'of a:horizontal I wedge-actuating shaft. 21 parallel .to theidrivin'g shaft 5. The shaft'ILi's rotatable iin bearings 5 on the bracket .3 and is lowerthanandLatthe left of the driving shaft viewed from-the front. It has secured to it near its front end an arm 29, which extends substantially! horizontally toward the right, and the under face of this arm is engaged by an arm 3| of an intermediate ated brake band'and plunger mechanism, gen- 4I (Fig. 1) hereinafter referred to lever 33 fulcrumed on a horizontal stud 35 secured in the bracket 3. Another arm 31 of the intermediate lever extends to the. right and has a face 39 which engages a brake releasing lever connected to the arm 25 of the wedge-actuatin lever and to the rear bearing for thedriving shaft tends to raise the Wedge to move the pulley I3 along the shaft into engagementw'ith the mem- A stronger spring 45, connected to the arm 31 of the intermediate 'lever'and 'to the bracket 3, tends to rotate theintermediate lever ber I1.

in a direction to withdraw thewe'dge I Band thus relieve the driving pressure between the pulleyand the member. I

The brake-releasing lever 4|; with its associerally resemble and'operate to stop the machine and return the knife I35 toits initial position'in ajmanner similar to the mechanism disclosed in Letters Patent of the United States No. 1,782,494, "Woodcock et a1.', November 25,1930; Said lever is 1 pivoted to an arm 42 rotatably mounted on the .driving shaft 5 and has joined to it one end of a brake-band 47, which passes'faround a brakedrum 49 secured on f the driving shaft 5; The other end'of'the brake-band is adjustably connected to the fulcrum-stud of the brake-releas- 'thecasing. The arrangement is such that when,

by the closing ofthe brake-ban'd' 41, the arm'42 "is clutched to the drum 49 and moves temporarily with' it, the spring 52 is compressed and gradu 'allystops the'knife. The spring then expands .and returns'saidknife to its: normal position.

' The intermediate lever 33 is actuated to release the brake and allow the wedge I9 to'bemoved by =it'sspring 43 upwardly to carrythe pulley I3 into engagement with the member IT, by a substantially horizontal, rearwardly extending. arm 53, which contacts with the underside of the arm 3'! of the-lever 33. 'The arm 53 is pivoted at its forward end to the'right-hand side of the machineframe Ion a stud'55. pThis arm is connected by an upwardly extending rod 5! to one arm of a :bell-crank-lever59 fulcrumed upon the frame by 1a stud'BI. The otherarm. of thelever 59 is coue pledby a'ball-joint to a forwardly extending .rod

63 connected atits forward end to'mechanism by which-it may be'moved rearwardly to actuate the'lever 33 and cause the machine to beeperated.-"" The greater part of the mechanism for actuatingthe rod .63 is mounted on a bracket 64' (Fig. T4), securedon the top of an-overhanging arm or the frame I nearlthe front thereof and over the rotary table, and is enclosed by a casing 55.

.'The rod is co'nnected'at its forward end by a balljointtoahori'zonwljarrn 51 extending laterally of the machine below theframe-arm. The arm. 61 is fast uponthe lower end of a vertical shaft 69 which is rotatable in 'a-bearing in the b acket A spring 43 p above the starting lever I5.

64, and the upper end of which extends into the casing 65. The shaft 59 has extending to the right near its upper end an arm II, to the front face of which is attached a block I3. The arm 67, shaft 69 and arm I I, taken together, may be con 7 sidered as a clutch-lever through which the driving mechanism is controlled. Pivoted on the upper end of the shaft within the casing 65 and above the arm 'II is a horizontal starting lever 75,

Which'has on its end outside the casing a handle I'I'to. be grasped by the right hand of theoperator. This starting lever has rotatably mounted in it between'its ends a vertical pin I9 with a 'notch'IiI in the left side. The notch isso arranged that whenthe pin I9 is in one rotary positionythe notch 8| will, when the starting lever I5 ismovedrearwardly, receive the block I3, so the arm II will not be actuated. If the pin. I9 is rotated slightly in a counterclockwise direction, as seen in Fig. 4,it will engage the block I3 upon movement of; the startinglever. This willrotate the shaft 69 andcausethe machine to be driven through theconnections hereinbefore described.

' Secured on the pin,'|9 isa horizontal arm 83,

which extends toward the left from the pin. just The arm, .With the various appendages. to be described, and the notched pin 19 by which the arm is pivoted, to-

gether: furnish a clutch-governing device acting through'theclutch- lever 61, 69, 1|. At theouten extremity of the arm 83 is a plate B5, 'the end of which is normally engaged by a hooked portion 84 of a substantiallyhorizontal, forwardly extending bar "81. 'Ihe'rear end of-thebar slides on the upperface of the starting lever and. at its:

forward end is connected by a universal coupling 89 to. the upper end of an arm 9| mounted ona horizontal shaft93 (Fig. 4) carried by a bracket 95 secured to the'left side of the frame-arm. The arm 9I'has formed with it an upwardly extending, controlling arm or hand-lever 9'I:arranged to .be actuated by the left hand of the operator.

uThe bracket: 95, in which the rock-shaft 93 is .mountedrhas an upwardly extending portion or ,post99-infrontof' the controlling lever, so that the post and lever may be gripped by the operator to facilitate for-ward swinging movement of said the lever is released, are moved rearwardly by a spring-plunger IOI in the post 99, and their rear Ward movement is limited by an adjustable screw andlwhich engages the bracket'95. v r.

The starting lever I5. is normally'held in its forward-position, against an unillustrated'springplunger in the casing 65,'by a spring I95 connected to the lever and to the casing. The hooked :lever. The controlling lever and bar 81, when r 7 I93 threaded in a lug on the controlling lever portion 84 of the bar 81 is'urged into engagement with the plate on the arm 83 of the governing device) by a spring IO'I connected to the bar and to the casing: The plate isheld normally in its rearwardposition by a spring I09 stretched between a pin III on thestarting lever and a pin on an extension I I3 from the arm. A stop-face II'5'formed on the arm 83 abuts against a lug .I H on the starting lever to limit rearward movement of the arm. The starting lever has pivoted .on its upperface on a vertical stud' I I9 a detent or catch I 2I-.-Extending from this detent is a log I23, normally held by a spring I21 against a,

projection I25 on the arm -83. When the pinv I9 is rotated, as will hereinafter appear, to allow the machine to be, Startedythe projection I25 moves away from thelug I23. ,The detent I2I is thereupon rotated by its spring I21, so that its rhooked en'd'. I29 .is.in a-positionfto engage, when "the starting lever is'movedrearwardly, aplate I3I. securedontthabracket 64. This will retain the lever in its rearward position to cause the .m'achine to continue in operation.

When the controlling lever 91 is in its rearward'position, the hooked portion 84 "on the bar 81 is behind the plate 85 on the'arm 83. When :the controlling lever is rmoved'to its forward po- .,sition by the left hand of .the operatorand the "bar 8! is thereby carried forward, the notched pin "I9 of the governing device is turned, by the engagement of'the hook84 with the plate-85, into such a'position that when the startinglever I5 is thereafter shifted to the rear by the right hand of the operator, the pin will engage the block I3 .onthe arm II. The shaft 691thereupon will be -rotated in adirection-to cause the'machine to be operated through the clutch mechanism previously described. If, howeven'the starting lever .is moved rearwardly before the controlling lever 19! has been actuated, the shaft 69 will-not be roitated, since the pin I9 will .be in such a position that its notch will pass by the block I3, and the machine will not be operated. As the pin I9 is turned'by the action of the controlling lever, the projection I on the pin-arm 83 releases the detent-lug I23 to allow the hooked end of the detent I2I on the starting lever to be swung clockwise by its spring I271. The resulting positon is such that upon operating movement of" the starting 'lever, the detent engages the plate I'3I and'holds said lever in operating position. This lever may then be released by the operator, and the machine will complete a single cycle and will be automatically stopped at the endof that cycle, 'as will hereinafter be described, provided the operator holds the controlling lever 91 in its forward position by his left hand. If,'however, the controlling lever is released at any time during the operation of the machine, said lever and the bar 81 are moved rearwardly by the springplunger IllI. This frees the arm 83 of the governing device and allows its pin I9 to be rotated by its spring I09 until the pin-notch 8i will receive the block I3, and thearm' II upon the shaft'GB of the clutch-lever is movedby the spring connected to the lever 33 through the notch. The shifting of said lever causes the pulley'I-S to be unclutched from the driving shaft 5, and the machine is stopped by the application of the brake. When the arm 33' isthus turned with the pin "I9, the projection I25, contacting with the lug I23, releases the detent I2I from theplate I3I, and the starting lever l5 is moved forward 'by itsspring I85 in readiness to cause again the operation of the machine. Since'the pin I9 is now in such a position that movement rearwardly of the starting lever will not result in the rotation of the shaft "59 of the clutch-lever andthe starting of the machine, the controlling lever must again be actuated to so position the pin that it will engage the block "I3 when the starting lever is moved rearwardly. Under these conditions, the clutch-lever will then again be oscillated to cause the machine to start into operation.

It will'therefore be seen that both hands of the operator requireto be occupied in a position of safety well above the moving knife I35 to start the machine, and that the right hand of the operator may release the starting lever I5 as soon as it has been moved to the starting'position. There is little danger of the operator, after'releasing' the staring lever, getting ,his :hand 'where it would be injured by .the knife orLits supporting mechanism. When: the machine starts, the knife 'rapidlyttravelsaroundrthe right-hand end of the .blanktbeingioperated upon, and'held between the pattern .;I3I.and :clamp I39, in a counterclockwise .directionseen from above, toward the rear of the knife and its supporting mechanism travel around I theIleft-hand end :and along the front of the blank, and if the operators left hand were free' at this time,itimight be lowered into a position where it would be injured by the moving parts.

The .free right hand of the operator may be utilizedin: preparing to supply another work-piece for the succeeding operation. The starting lever I5 and the controlling lever 91 are positioned substantially on the same level heightwise in the machinaandthe starting lever is relatively close J to :the controlling lever, so that the two hands of the operator, when actuating said members, are held in a convenient position at a height somewhat :below the level of the shoulders of a man' of average height. I

.The mechanism forautoniatically. stopping the illustrative machineat the end of a single cycle includes'a cam. MI (Fig. 3) secured on the under side of the table II, the outer edge of which cam, 1

.toward'the end of the rotation of the table, en gages a projection I43 rising from one arm I44 of a bell-crank-lever ME'pivoted on a vertical stud 'I' l'l fixed in a bracket secured to the machineframe. The other arm I49 of the bell-cranklever I145 has pivotaily connected to it a rearwardly. extending rod I5I, which passes through an opening in a block I53 having a'depending stern which is pivoted in an arm I secured to a vertical shaft I51 rotatably mounted in the .'bracket'behind the stud MT. The rod I5! has fast on it a collar I59, which, when the bellcrank-lever1 i5 is 'turnedby the cam I4'I, en gages ithe block I53-and positively moves the arm I55 rearwardly. Surrounding'the rod is a spring 'IEI, whichengages the block I53 and a collar I53 secured near the end of the rod. Attached to the shaft I51 near its upper end is an arm I55. Pivotally connected to this arm is a'forwardly extending rod lSL'which is pivotally connected to an arm I69 (Fig.4) of a bellr:

crank-leverIII fulcrumed on a vertical stud I13 .infthe bracket 64. The arm 59 extends to the right, and a forwardly projecting arm I15 of pin I" so moves the bar as to disengage its Z.

hooked portion 84 from the plate 85 on the-arm :83 of the governing device. The arm is then :moved rearwardly by its spring we, and the'pin 5 -19 is turned into a position in which its notch SI allows the'block I3 on the arm II to be moved by its spring 45 through the notch. The resulting :shifting .of the intermediate lever 33 causes the nnachine to be stopped, as already described.

As1thetable I I arrives at its stopping position, .the .cam. I4 I, under .thexinfiuence of the .momentum of the parts, travels past the projection I43 started by proper manipulation of the controlling and startingilevers. If it were possible forthe table to stop with the cam IAI holding the lever I45 in its rearward position, it wouldbe impossible to again start the machine until the table had been rotated manually to movethe cam away from'the projection I43. The above-described ar- .rangement, wherein the projection I43 on the lever engages the inner edge of the cam during the return movement of the table I I, insures that the machine may be started simply by manipulation of the levers after having been stopped by the To enable the table II of the illustrative machine to be turned manually if desired, the machine may have rotatable in a bracket secured to the right of, the frame I below the tableya rearwardly extending shaft, which near its forward end has secured on it one member of a toothed clutch. ,Rotatable and slidable on the shaft at the front of the clutch member is a second member of the clutch, this having projecting from it a hand-lever by which the clutch may be engaged and the shaft rotated. Fast upon the rear end of the shaft is a sprocket-wheel which is connected by a chain to a sprocket-wheel secured to the driving shaft 5.

The illustrative machine is provided with operator-controlled safety means, whereby the wedge I9 maybe prevented from being moved in a direction to carry the pulley I3 on the driving shaft 5 into engagement with the driven member I! when the controlling and starting levers are actuated by the operator. This means comprises a shaft I8I (Fig. 5) extending beneath the table I I and rotatable at its forward extremity in a bearing on a bracket at the left of the frame I and at its rear end in a bearing on the bracket l 3. The shaft IBI has secured on its forward end a hand-lever (not shown) by which the shaft may be actuated and has fixed to the opposite extremity a cam I83, which in one angular position engages an arm I depending from the wedge-lever 25 and holds the wedge I9 and wedgebar 23 from upward movement to effect engagement of the clutch. In another angular position, the cam allows the wedge I9 to be shifted upwardly by its spring 43 when the controlling and starting levers are actuated. When the cam ,is

in the former of the two positions, actuation of thecontrolling lever and the starting lever causes the brake to be released, and if the controlling lever 91 is held in its actuated position, the starting lever may be freed by the operator and his right hand used to rotate the table manually, as previously described.

The machine is further provided with stationary worktables I81 and I 89 secured to the frame I, respectively at the left and right of the rotary table II. These tables I81 and I89 extend forwardly close to the forward edge of the table I I. The top of the table I81 is substantially at the level of the upper face of the rotary table and is about twenty inches from front to rear, so it extends almost as far rearwardly as the rotary table. 'It is about twelve inches from side to side, the inner edge being curved about the'axis of the table II andlying close to the periphery of a guard I9I, surrounding the last-mentioned table. "The table I81 has an upwardly extending wall I93 around its left, rear'and front edges. The table I89 is substantially level with the top of the pattern I31 on which the blanks are clamped and is about thirty inches from front to rear and about twelve. inches wide. Its inner edge extends around and close to the right side of the guard I9I and also rearwardly beyond the table II. It has at its'rear left corner a. square,

walled-off portion I95, forming a receptacle for tools, andan upstanding wall I9! is shown at its rear andright edges. The upper face of the guard I9I surrounding the table II is level with the upper face of the rotary table and consists of a narrow ring of right-anglesection extending downwardly below the gear 9 to shield the,

operator from contact with said table. -The guard is secured at its rear to the machine-frame by a horizontal spindle I99 extending laterally of the machine and passing through the frame and lugs upon the guard at each side of said. frame. At the front, the guard maybe sup:- ported by a bracket secured to the machine-frame.

The particular. heightwise relation above described, of the rotary table and the two station ary tables at the opposite sides of the machine, facilitates the presentation of fresh work-pieces between the pattern I31 and its co-operating clamp I 39 and the removal from the operating position of W0rk pieces which have been operated upon. This is true, since-when the clamp is allowed to rise away from a trimmed workpiece on the pattern by release of its controlling treadle, the operator is able quickly-With his left hand, to slide the work-piece off the pattern toward the left with the knowledge that the piece Will find its Way on to the table IB'I without falling off the table II toward the floor. he can almost simultaneously carry a work-piece to be trimmed off the table: I89 with his right hand, this piece being caused, by the fact that this table is substantially level with the upper face of the pattern, to slide on to the patternv without having to be lifted orlowered by the operator.

Having described our invention, what we claim as newand desire to secure by Letters Patent taneous engagement by the hands of the operator,

both of which'levers must be actuated to control the movement of the knife by the driving mechanism.

2. In a, rounding machine, a frame having an overhanging arm, a pattern mounted upon the frame, a clamp movable upon the arm in cooperation with the pattern, a knife movable about the pattern, driving mechanism by which the knife is moved, and two levers mounted side by side at substantially the same height upon the overhanging arm and both movable by the operator in a direction longitudinal'of the frame to cause the movement of the knife by the driving mechanism.

3. In a rounding machine, a, frame having an overhanging arm, a patternmounted upon? the frame, a clamp movable upon the arm in co-. operation with the pattern, a knife movable about the pattern, driving mechanism by which the knife is moved and including a clutch, a controlling lever, a starting lever and. a clutch-lever, all fulcrumed upon the frame above the clamp, the controlling lever governingthe movement of the clutch-lever by the starting lever, and connections between the clutch-lever and clutch.

4. The combination with operating mechanism, of driving mechanism therefor, a devicemovable to govern the driving mechanism, two members for actuation by thefoperator, the movement of, one member preparing the device for'movement by the other, a catch movable upon onemember, and relatively fixed retaining'meanswhich the catch engages.

5; The combination with operating mechanism, of driving mechanism therefor, a device movable to govern the driving mechanism, two members for actuation by the operator, the movement of one member preparing the device for movement by the other, a catch movable upon one member, relatively fixed retaining means which the catch; engages, and means movableupon the member with thecatch for determining the position of said catch.

6. The combination with operating mechanism, of driving mechanism therefor, a device movable to govern the driving mechanism, two members for actuation by the operator, the movement of one member preparing the device for movement by the other, a catch movable upon one member under the influence of the other member, and relatively fixed retaining means which the catch engages.

'7. In a rounding machine, a pattern, a knife movable about the pattern, driving mechanism for the knife, a starting lever for the driving mechanism and a controlling lever for the starting lever, both of which levers are movable by the operator, a retaining detent movable upon the starting lever, and a relatively fixed projection for engagement by the detent.

8. In a rounding machine, a pattern, a knife movable about the pattern, driving mechanism for the knife, a starting lever for the driving mechanism and a controlling lever for the starting lever, both of which levers are movable by the operator, a retaining detent movable upon the starting lever, a relatively fixed projection for engagement by the detent,-and a lever fulcrumed upon the starting lever and acting upon the detent to vary its position.

9. In a rounding machine, a pattern, a knife movable about thepattern, driving mechanism for the knife, a starting lever for the driving mechanism and a controlling lever for the starting lever, both of which levers are movable by the operator, a retaining detent movable upon the starting lever, a relatively fixed projection for engagement by the detent, and a lever fulcrumed upon the starting lever and movable by the, controlling lever to vary the position of the detent.

10. The combination with operating mechanism, of driving mechanism therefor including a clutch, a clutch-lever, a controlling lever and a starting lever each arranged for actuation by the operator, and a clutch-governing device having a space to receive the clutch-lever without eifect upon it and arranged adjacent to the space for contact with said clutch-lever, said device being moved by the starting lever and movable upon said starting lever into clutch-lever-engaging position by the controlling lever.

l'L'The combination with operating mecha' nism, of driving mechanism therefor including a clutch, a clutch-lever, a controlling lever and a starting lever each arranged for actuation by the operator, and a clutch-governing device comprising a rotatable latch-pin and an arm pivoted at the latch-pin upon the starting lever, the" governing arm being acted upon by the control-" ling lever to position the latch-pin and said latchpin in certain positions engaging the clutchlever. i l r '12. The combination with operating mechanism, of driving mechanism therefor including a clutch, a clutch-lever, a controlling lever and a-startirig lever each arranged for actuation by thexoperator, a clutch-governing device arranged for contact with the clutch-lever, said device being moved by the starting lever and movableupon said starting lever into clutch-lever-engaging position by the controlling lever, and a catch for the starting lever movable by the governing device.

13. The combination with operating mechanism, of driving mechanism therefor including a clutch, a clutch-lever, a controlling lever and a starting lever each arranged for actuation by lever and having a notch, said notched pin being arranged either to engage the clutch-lever or to pass it unaffected, a clutch-governing arm pivoted at the pin, and a controlling lever acting upon the clutch-governing arm.

15. In a rounding machine, a pattern, knife mechanism movable about the pattern, driving mechanism by which the knife mechanism is moved and including a clutch, a clutch-lever, a starting lever, a pin rotatable upon the starting lever and having a notch, said notched pin being arranged either to engage the clutch-lever or to pass it unaffected, a clutch-governing arm pivoted at the pin, a controlling lever, and a bar movable by the controlling lever and having a projection engaging the clutch-governing arm.

16. In a rounding machine, a pattern, knife mechanism movable about the pattern, driving mechanism by which the knife mechanism is moved and including a clutch, a clutch-lever, a starting lever, a pin rotatable upon the starting lever and having a notch, said notched pin being arranged either to engage the clutch-lever or to pass it unaffected, a clutch-governing arm pivoted at the pin, a controlling lever, a bar movable by the controlling lever and having a projection engaging the clutch-governing arm, and means for moving the bar to free the clutch-governing arm from the projection.

1'7. In a rounding machine, a pattern, knife mechanism movable about the pattern, driving mechanism by which the knife mechanism is moved and including a clutch, a clutch-lever, a

lever'and' 'having a notch, said notched pin' being arranged either to engage the clutch-lever or to pass it unaffected, a clutch-governing arm pivotedat the pin, a controlling lever, a bar movable by the controlling lever and having a projectionengaging the clutch-governing arm; and means movable by the knife mechanism for moving the bar to free the clutch-governing arm from the projection. 7

18. In a rounding machine, a pattermknife mechanism movable about the pattern, driving,

mechanism by which the knife mechanism is movedthrough an operating cycle to its normal position, means controlling disconnection of the driving mechanism and permitting the knife mechanism to pass the normal position, and means for returning the knife mechanism to normal, said knife mechanism being provided with a portion effective during the forward movement to actuate, the disconnecting means and ineffective for such purpose during the return movement. V

19. In a rounding machine, a pattern, knife mechanism movable about thepattern, driving mechanism by which the knife mechanism is moved through an operating cycleto its normal 20. v In a rounding machine, a pattern, rotatable knife mechanism movable about the pattern, driving mechanism by which the knife mechanism is moved through an operating. cycle to its normal position, means including two levers and,

a rod connecting the levers positively 'for movement in one direction and yieldably upon movement in the opposite direction, such means con-t trolling disconnection of the driving mechanism and permitting the knife'mechanism to pass the normal position, and means for returning the knife mechanism to normal, said knife mechanism being provided with a cam arranged to con tact at its outei edge with one of the levers during the positive lever-connection and at its inner edge during the yieidable connection.

HAROLD ERNEST ELLIOTT. WILLIAM NEIL BRAY.

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