US1040983A - Milling-machine. - Google Patents

Description

C. R. NORTH.

MILLING MACHINE.

APPLICATION FILED 111114, 1910 Patented Oct. 8, 1912.

6 SHEETS-SHEET 1.

Patented 0ct.8, 1912.

6 SHEETS-11231 2.

C. R. NORTH. MILLING MAOHINI. APPLICATION FILED Jam-:4, 1010' Patented Oct. 8, 1912.

6 BKEETS-SHEET 3.

0. R. NORTH.

MILLING MACHINE.

APPLICATION FILED JUNE 4, 1910.

1,040,983? Patented Oct. 8, 1912.

6 SHEETS-SHEET 4.

C. R. NORTH.

MILLING MACHINE.

APPLICATION FILED JUNE 4, 1910 1 04 0 98 3 Patented Oct. 8, 1912.

' 6 SHBETS'SHEET 5.

G. R. NORTH.

MILLING MACHINE. APPLICATION 211.121) JUNE 4, 1910.

Patented 0013.8,19112.

6 SHEETS-SHEET 6.

zmw 6.94 @2146 CHARLES R. NORTH, OF HARTFORD. CONNECTICUT, ASSIGNOR F ONE-HALF TO PATENT orrion.

HENBY G. NEWTON, OF NEW HAVEN, CONNECTICUT.

MILLINGJVIACHINE.

it ALMLQSFL Specification of Letters Patent.

Pa tented Oct. 4 ,1i912.

- Application filed June 4, 1910. Serial No. 565,028.

Figure 1 a plan view ot a milling" machine constructed in aeeordam-e with my mrention. Fig. l a. view thereof in 'vertieal longitmtmal. section. Fig. 3 a view of the maehiue in end elevation on an enlarged scale looking toward the tool-earrier. Fig. 4 a detaehed view partly in elevation and partly in vertieal seetion showing the boxshaped slide employed to eonneet the hellcrank ltver with the t'tml-earrier. Fig. 5 a. broken view in vertienl aeetion showing: the elastic eonneetiou between the workcarrier and the work-earrier ram. Fig. t3 a perapetftive view of one of the moditied torms whieh m v invontion ma) asamne. Fig. 7 a diaggrannnatir illustration ot the a'p ilieation of my inventi n to a maehine tor milling irregularly plared ln .='.e 1 upon a tlat .-.tll'ii'.l(t.. Fin. H a plan view Showing a moditieation of my improved marhine. Fig. 9 a ttttttt'littl plan view of the swingingarm 85 of the moditiec l ermstruetimi shown by Fig. S. the rutter-earrying arm 82" being broken away, and the cutter S and the former-pin being! shown in horizontal see-- tion in their proper relation. to the former 17 and the \i'orh-blanlefi, both of whirh are supported upon the work-lmlder -'-l \Vlllt'l] is mounted upon the arm 81'). The curved path tl'flVtJfHttl by the eut'ting' tool 8 is not separately shown. but it is represented by the eontour of the work-blank My invention relates to that elaea of milling maehines Whieh have two parts or earriew; movable transversely with reapeet to eaeh other. and a revolving cutter Wl'lOSt. axis ie at right angtesa to both the tranr-iversxe new-tune of said ItlOVflbiG parts. or earriers. the object being to produce-a simple, reliable. convenient and ellieient. mechanism providi g for automatieally 'teedingthe cutter or work. or both. so that the cutting" will he done in any de1 ired irregular path, whereas in milling; maehines of the same class oi. the prior art. ment ha been made by hand.

with these ends in view. my invention eonsist's in the eombination with two parts or carriers movable transversely with respent to earh other. of a revolving cutter having its axis at right angles to a plane parallel to the tranaversze movement of both of aid parts or (.Htlitl'fi. and automatic means for imparting predetermined individually variable n'iovements and speeds to the reaper-tire parts or earriers. whereby the same. re-aet upon eaeh other to eonjointly eauae the rotting-to be done by the said cutter in a predetermined rurved or irregular path.

My, invention further eonsists in certain details'o't eonstruetion and combinations of parts as wili be hereinafter deieribed and pointed out in the claims.

l n earrying out my invention as herein shown. t emplox a reeiproeating work-earrier E. ronsistino ot' a table suitably mounted upon the maehine frame it so as to be. moved bark and forth lengthwise thereof. Upon the \vorle-earrier 2 is mounted a block or head -t to which the blank 5 to be milled is secured.

Tn eonjunetion with the work-earrier 2,

l employ a tool-earrier ti arranged to be moved transverselv to the movement of the worlc-earrier .2 and mounted upon an upright frame 7 bolted to the machine frame 3. shown. the toolearrier (i is provided with two rotary cutters R and 9 removahly mounted in' the lower ends oi spindles l0 and 1t. journaled in bearings 12 secured to the earrier ti. eaeh spindle being furnished with a driving" pulley 13. one cutter being intended to be employed as a roughing-out entter and the other as a finishing cutter.

Tn earrying out the embodiment of my invention now being described. provision must hev made for moving the work carrieI; 2 and the tool-carrier 6 automatically and concurrently each with predetermined in the feeding move- 7 dividually variable'movements and speeds, the provision for the movement of each being independent for the movement of the other, so that the resultant action of the cutters 8 and 9, either or both, upon the blank 5 shall be to mill the latter in accordance with a predetermined pattern whether that pattern be included in the machine or not in the shape of a former, so called.

The-automatic variable movements of the carriers 2 and 6 are as herein shown, eftected by means of cams having concurrent and continuous movement during the operation of the milling and provided with paths shaped in each instance according to the dictation of the curved or irregular paths in which themilling is to be done. In other words, every time the work to be done changes itsform new cams must be specifically designed in accordance with that form. Every machine made in accordance with my invention will probably be farnished with interchangeable sets of cams covering the range of the work to be done by the machine.

As herein shown, I employ a worka rrier cam 18 mounted upon a horizontal. camshaft 19 journaled in bearings 20 and pro vided at its rear end with a worm-gear 21 meshed into by a worm 22 mounted on a worm-shaft 23 provided at one end with a pulley 24 receiving: a driving belt from any convenient source of power.

The work-carrier cam 18 is formed with a cam-path 25 the'specific shape of which con'jointly with the shape of its companion cam path 41 is dictated by the form of the path in which it is designed that the cutting shall be done, the cam-paths being plotted witl the assistance of a sample pattern of the desired.ultimate form. Diffcrent methods laying out/the cam-paths 25 and ti may, dl course, be employed I The said path 25 is entered, shown, by a campin 26 mounted in the rear end of the rear section 27 'of a connecting-rod, the front tion 28 of which is secured by a screw-bolt 29 to the under face of the worlncarrier 2.

In feeding a profiling machine by hand, it is absolutely essential that a former and former-pin be used. 7

'While it is quite possible to make the cams in my machine sufiicientlv accurate to do good work, this is a matter of some difl'iculty, which difiiculty is encountered with each new set of cams for a different profile.

A more serious source of inaccuracy is the wear of the ditterent parts of the mechanism, causing loss of motion, which may cause inaccuracy ip rvarious ways. For example, when the motion of one of the transversely moving parts or carriers is reversed, that part must respond immediately. Any such lost motion would cause a delay, which would result in inaccuracy in the work and such inaccuracy may also be caused in a dillcrent manner by the wea r of the cutter.

The use of the former and former-pin in co: bination with the mechanism above described and the elastic c nnections hereinutter niti'iticncd. prevents this inaccuracy and causes the piece milled to conform to the contour of the tormer, and the cams can easily be made sulliciently accurate to insure good work in such a combination.

As shown the tool-carrier 6 is formed on its lower edge with lugs l lfor the reception of formernns 1i) and 16 respectively arranged to operate in conjunction with the cutters S and 9. One or lhe other of the former-pins 15 and 16 co-acts with a former orpattern 17 secured to the block or head 4-, according to the position of the carrier 6 upon the upright frame 7 as will be hereafter explained.

It is essential that whichever of said pins is in use shall be pressed by an elastic pres sure into contact with the edge of the said former. This elastic pressure may be pro vidcd for in dili'crent ways. As shown, I provide for it by elastic connections between the cams and the work-carricrs. For the clastic connection between the can] 18 and the work-carrier "2 l: employ a connect- I of the rod-scclions 37 and 28, whereby the sleeve 30 is divided into chambers 34: and lVithin the chan'iber fl". 1' locate a spiral spring, so encircling; the projecting forward end of the rod-section E2? and interposed between the rear face of the abutment 32 and the front face of a collar 37 secured to the said rod-section 27. Within the chamher 35 I locate a spiral spring 38 encircling the rear end of the rod-section 2S and interposed between the inner face of the front head 31. and the front lace of a collar 39 Secured to the rear end of the rod-section 28. The said springs '36 and 38 press the collars 37 and 39 against the rear head 31 and the central abutment 32 respectively with an elastic pressure, the rear head 31 and the central abutment 32 both serving as abutments to limit the extent of movement of the springs 36 and 38.- Under the construction described, the parts will normally have the positions shown in Fig. 5, and virtually actas one piece, since the springs 36 and 38 will be confined as above stated and strongly compressed and sulticiently heavy not to yield under any of the thrust exerted by the cam 18 through the rcd-section '27 and 28 in doing the actual cutting whcn a former-pin is not employed. The springs, however,

eaner-is it:

provide an elastic connection lit-tween the worlecarrior 2 and the said cam in tcr use in connection with the former-pins ti and 16 and forner 17 as will he descrihcd later on.

For moving the tool-'arrier (3 at a right angle to the path in which the wta-lc-carritw 2 moves, I employ a' toohearricr cam 10 mounted upon the eanrshalt it) and pr vided with a cam-path 41 which will he shapcd conjointly with its companhm campath 25, het'ore mentioned. in accordance with the. form of the path in which it is designed that the butting; shall he done. the same as in the case at the cam-path 95 in the work-carrier cam IS. The said cam-- path 41 is entered by a pin t) mounted in the inwardly extending arm 4;; at a hellcrank lever liswinging upon a vertical stud 45 and having a forwardly projecting;- arm 46 connected h v a pin 47 with the outer cud of a connecting-rod -18 having its inner end connected by a pivot 4th with the head no ota plunger 5] one end of which supported by the bearing of its head 50 in an upright partition '"2 located within and ahoul. midway the length of a hoteshapcd slide as provided at its opposite ends with lirunnions Til adapting it to he mounted with a capa ity for endwise sliding n'uwement in the l'ran'te i. To the opposite end of the plunger 51 is rigidly secured a bushing 55. hearingin a ot the partition 56.

partition 56, corresponding o the partition 52, and located near one end ot'thc slide 53. Upon the plunger, and about midwav of its length, is rigidly secured an abutment collar 57, forming an ahulmcnt for the ad jacent inner end of springs 58 and 5.) encircling the plunger, and ahutting at their outer ends against washers 0 and 1 respectively bearing against the inner ends at the head 50 and the hustling 55. The springs 58 and Share con lined and strongly compressed, and force the washers it) and il against the head Btl'and the hashing 55 with an elastic pressure. the head no and l)llF-iliing 55 but serving as ahutmcnts to limit the extentof movement: of the springs and 59. The washer is also in contact with the inner face of the partition 69. while the washer (ll is in contact with the inner face Under this construc tion, whenever the. plunger 51 is moved, the hon-like slide is moved with it. the springs 58 and 59 beingconfined. as above stated, and strongly com n'essed. and still enough not to 'yiald under the resistance created by the cutting ol the hlank. it' how over, either the'hlank 51, or the slide 5?, is moved and the movtanent ol the door is with sullicient "force obstructed, there will he a relative movement ol. the plunger at in the partitions 52 and 56, and one of the springs 58 and 59 will be further eoi'nprcsscd hetween the abutment-collar 57.21nd the ad jacent partition. the washer hctwcen moving upon the plunger Fit. it movement in the opposite direction, it ohstrnclcd, would cause the other spring to he further compressed. and. in either case. a 't'orce equal to the strength of the spring would he exried to rcslorc the parts to their normal position. lhcre is thus l'ormcd an elastic cmincction lictwccn the tool-carrier t3 and thc cam l hut lhis elastic ttllUlWlitlIl like that hctucen thc \\'orlt-carricr l and cam in may he repla ed hy an elastic dcricc of some other term. it lwinpgontr necessary to provide n-canin the machine to constantly hold tl e torxucr-pin upon the former with an elastic. prcssurc during the progl'ress ol' the work. it is only when the lorincnpin 15 or lt' and former ii are lit-ought into play that either ct thc springs 23th 25% 58 or 59 is caused to '\'i(*l(l. l'hc use ol the t'ormcr and formerpin and the claslic comu-ctious in thc operatlon ol' the machine will he 'l'urthcr explain d lat r on.

it will he umlcr tcod that the cam 18 will nuwc the worlt carrier L with \al'iahlc movements and speeds u-edctcrmincd in their chara ter h thc town of the cam-path 33 so that dcpcndcut upon the 'l'orm ot the campath Elf. thc \\'orl arrita- 3 will more in a right lin slow or last. or come to rest. or rclrcat and advance. and the same is true as to the tool-carrier t3 the cam ll) and the campath ll.

in order to provi e l'or shilling the toolarricr to iring; either the cutter H or the cutter l into play I l'orm two holes (32 and tlil in thc vertical wall of the llUX-lllit slide.

5;, at points separated from each other to correspond to the separation of the cutters 8 and 9. The said slide 53 is coupled with the tcol-carricr it through one or thc ct'hcr rt the two hch; oz and hit h means ot a conpliniipir l ecclli'ctl to a hw'cr handle (35 pi\' otallv suspended trom a hracltct tit 'l'astcncd to the ioola-arricr i which i termed with a holc t i llii'oll;1' l1 which the pin lit projects into one or the other ol the two holes (32 and of, in thc hoe-like slide 53. 4

With rclcrence now to the use (it the hu'm r-pin and l'orluer, ll may say that it will he onvenient to use them in cutting the cam-paths and -'ll in the cams l8 and "ill, although the cam-paths in question may he laid out in ome other way. l n case the pin l5 for instance. and l'ormcr 17 are used in hrvin; out thc said cam-paths, hlank cams c rresponding; lo the cams-z l8 and -'l()' are mounted upon the shalt l.) and the pins 26 and replaced hr tracing pins the pointed ends at which will then rest upon the sur t'a c ol the hlanh cams. Now it is apparent that it the tormcr-pin l5 is moved around the loriucr l't' in contact with the edge there; ot. and. it th cams are at the same time re vol *d. the said tracing pins will trace upon the surrace of the blank cam, lines to be followed in the cutting of the cam-paths in the cams. The proportionate speeds of the revolution of the blank cams and the movement of the former-pin upon the former may be regulated as may be found expedient. hen the cam-paths are cut the cams are restored to the machines, the pins 26 and 42 are restored thereto, and entered into the respective cam-paths. Now when the machine is operated, the combined cam-paths in the cams will reproduce in the con'ibined movement of the work-carrier 2 and the tool-carrier G the exact path of the former-pin 15 around the former 17. Itis possible also that the cams might be out without removing them from the machine by replacing the pins 26 and 42 with revolving cutters instead of with tracing pins, but as already explained I do not limit myself to any method of laying out or cutting the campaths .in the cams, it being only necessary that they shall be shaped so that in the operation of the machine, they will result in the cutting being done in the desired path.

Assuming that the machine has been constructed so that the cam-paths in the cams will cause the cutting to follow a path of the same form as the form of the pattern or former, it is apparent that the elastic connection between the cam 18 and the workcarrier 2 will act as one piece and that the elastic connection between the cam 40 and the tool-carrier 6 will act as one piece and that none of the springs described will yield. If, however, the former-pin used in connection with the former in tracing the cams, is removed and replaced by a larger formerpin, and a cutter corresponding in diameter to such larger vformer-pin is employed, it is apparent that one of the two springs of one or the other of the two elastic connections must yield in order to accommodate the larger former-pin with the result that the spring caused to yield will exert a constant ettort as longas it is compressed to force the former pin against and keep it in close contact with the former, whereby all wear, inequalities and back lash will be taken up and an accurate product be secured. Of course 'in the movement of the former pin in its travel around or over the former, one

or more, or all of the springs will be caused to yield in regular or irregular order according to the contour of the former.

In the modified construction shown by Fig. 6 of the drawings, I also utilize the transverse movement of two movable parts or carriers driven automatically and con'-' currently with predetermined individually variable movements and speeds for securing an ultimate doing of the cutting in the predetermined path. In the employment of this principle, I employ a work-carrier 68 upon which theblank- 69 to be milled is mounted. This Work-carrier 68 is furnished at one end with a bracket 70 carrying a pin 71 entering a long slot 72 arranged at a right angle to the axis of the work-carrier and formed in an arm 73 at the inner end of a bar which is connected with a-cam corresponding to the cam 18. The work-carrier (38 partakcs not only of the movement of the cam corresponding to the cam 18, but also of the movement of a cam corresponding to the cam 40 for which purpose the workcarrier 68 is mounted upon a carrier 7 moving at a right angle to the movement of the work-carrier (38 upon an uuder-cut bearing 76 secured. to a bed 77, the carrier being connected at one end by a bell-crank lever 78 with a cam corresponding to the cam t0. In this modification of my invention it will be apparent that the combination of the movements produced by the two cams produces a movement which is imparted to the work which is thereby ted to a revolving stationary cutter 79 indicated conventionally and extending downward from above. If desired, of course, the work-carrier 68 might be connected with the cam etO and the carrier 75 with the cam 18, this being a mere reversal of connections. What I wish to make clear is that in this modified construction as in the construction shown in Figs. 1 to 5 inclusive, the control of the cutting in accordance with a predetermined form is automatic rather than manual.

I have shown and described my invention as applied to profiling objects by cutting their edges. but my invention is equally applicable for the construction of machines working on the same principle but milling irregularly placed points or bosses on fiat surfaces where the cutting is being done in an irregular path. This is illustrated diagrammatically in Fig. 7 in which a series 0f irregularly placed bosses 80 rise above the surface of a plate 81. By providing the two cams 18 and 1-0 with cam-paths outwith regard to the irregular placing of the bosses 80 upon the plate 81, the said bosses will, by the ultimate irregular movement derived from the two cams, be successively milled oil to the same level, the cutting being done approximately in the line 82. Conversely the manual reproduction of the line 82 may be utilized for tracing upon blank cams lines which, it followed, in cutting cam-paths in the same blank cams, will automatically reproduce the movement represented by the path 82.

It will appear from the showing of Fig.

7 that my invention is not limited to em bodiment in machines designed solely for profiling in the strict 'sense of that Word, but that it is adapted to be used in the construction of machines designed for the one cution pf milling operations of an unsymmetrical character in which the path or the cutting is irregular as distinguished from a regular path.

I will repeat that the resultantpath of the cutting is the product. of a movement derived not from either cam taken by itself, but from both cams. Thus, although the carriers may move in regular paths, the variable character of their movements, each acting t'ansversely upon the other, results in the cutting being done in an irregular path. In accomplishing this result the cutter and the work may both move in regular paths or the cutter may move in an irregular path while the work remains stationary, or the work may move in an irregular path While the cutter remains stationary, according to the di'l'l'ereiu arrangements olf the combination, but in either arrangement the cutting may be done in an irregular path.

\Vhile in the constructions shown in Figs. 1 to 7 of the drawings the carriers move in straight lines, they might be so arranged as to move in a rcs of circles as shown in Fig. 8 and the same result he obtained, plOVltilW l that the carriers were moved transversely avith respect to each other and the move ments and speeds of each made individually variable so as to conjointly produce the cutting in a predetermined path. 7

Vith regard to the n'ioditication shown in Fig. 8, it may be said that the construction of the frame the canrshat't 19 and its supporting bearings, the cams 18 and 410, the wornrgcar "21, the worm with the worm shaft, (not shown in this sketch) and the bell-crank lever it is the same as shown in Fig. 1. The cutter spindle it), however, is mounted in bearings formed in the outer end ot'a long arm 83 which is caused to swing on the fulcrum 8st at the inner end of the arm. The cutter spindle 10 is thereby caused to move in a curved path represented by the dotted line. Movement is given to the arm 83 by means of the cam-path in the cam 40 operating through the bell-crank le- Ver 4.4. The arm ll of the bell-erank lever 44 is connected to the (aittcr-(arrrying arm 83 by the connecting rod 48, as shown. The Work-carrier 2 is mounted also on the end of a long arm 85, which is caused to swing on a stud 86 rising from a bracket 87 secured to the side of the frame 3 as shown. The Work-carrier 2 is thereby caused to move in a curved path also represcntial by a dotted line. The Work-carrier 2 receives movement from the cam 18 through the cam-pin 26 mounted in the rear end of the rear section 27 ot' a connecting rod. The front section 280E the connecting rod is secured to the rear section by a ivot 88 and to the work-carrier 2 by the pivot bolt 29. This arrangement allows the slight lateral movement-of the front section 28 required by the curved movement of the work-carrier 2.

The work to be milled is mounted on the work-carrier 2 in position to l acud upon by a revolving cutter mounted in the iower end ot the spindle .10. By means of the cams 1S and it) and the connections described. such movements are given to the cutter spindle It) and the .work carrier 2 as to cause the work to be milled to the required shape. To determine the cam paths in the cams l8 and it), a former-pin is secured in the place of the cutter in the lower end of the spindle l0 and a former in the place of the blank to be cut on the work carrier :2. The cam-pins Z0 and 42 are replaceil by tracers and the cam-paths are traced as belore described. in order to give a rotary movement to the cutter spindle 10, a bracket is rigidly secured to the upper surface of the arm 811 over the fulcrum 84. From this bracket rises the arm 89 in which is secured the shatt tltl upon which the pill-- toys 91 are so mounted as to rotate thereon. bell; descending l'rom a revolving shaft overhead turned by the pulleys fill in a horizontal direction. and passing around the pulley 12') gives rotary movement to the out ter spindle it). A bracket 92 secured to one edge of the arm 53 provides for carrying the 't'ormenpin l 5. Provision may also be made l'or the "se of a tonne and former-pin in the active operation of this device, but it has not been considered necessary to show it in this d 'awin The method above disclosed of determining the contours of cam paths is not herein claimed as it is made the subject of a separate application tiled September 6th, 1912, Serial No, 718,878.

1. in a milling machine for milling in a curved or irregular path, the combination with two parts or carriers movable with respect to each other in transverse paths, of a revolving milling cutter having continuous independent rotary movement with its axis at right angles to the transverse movements of both of said parts or carriers, a single continuously revolving shaft bearing and giving rotary movements to two canrpaths, and motion transmitting independent con: uections between said cam-paths and said carriers respectively, each of said cam-paths being so shaped as to give its respective carrier such variable movements and speeds that said carriers, acting con-jointly in said transverse paths, may determine the curved or irregular path of the cutting conformably to a predetermined pattern.

A milling machine for milling in a curved or irregular or carriers movable with lesp'ect to each other in transverse paths, a revolving milling cutter having its axis at right angles to a plane parallel to the transverse movements of said both parts or carriers, and an automatic feeding device including a single repath, having two partsv volving shaft bearing and giving rotary movements to two cam-paths conjointly so determined in their contours by the contour of the path in whi h the milling is tobe done that when employed in the machine and acting through driving connections upon the parts or carriers they conjointly determine the path of the milling by said milling cutter con't'ormably to the predetermined pattern, said driving connections in cluding means for changing the direction of i'novemeut for one of said parts or carriers so that they may move in transverse paths.

In a milling machine for milling in a curved or irregular path, the combination with two parts or carriers movable with respect to each other in transverse paths, of a revolving milling cutter having continuous independent rotary movement with its axis at right angles to the transverse movements of both of said parts or carriers, a single continuously revolving shaft bearing and giving rotary movements to two cam-paths, motion transmitting independent connections between said cam-paths and said carriers respectively, and a bell-crank lever for changing the direction of motion imparted to one carrier, each of said cam-paths being so shaped 'as to give to its respective carrier such variable movements and speeds that said carriers acting conjointly in said transverse paths may determine the curved or irregular path of the cutting conformably to a predetermined pattern l. In a milling machine for milling in a curved or irregular path, the combination with a work-carrier and a tool-carrier movable with respect to each other in transverse paths, of a single revolving shaft bearing and givlng rotary movement to two campaths, a revolving milling cutter mounted upon said too1carrier, means for securing the work to said work-carrier, and driving connections between the respective carriers and cam-paths including means for changing the direction of movement for one carrier, each of said cam-paths being shaped in such manner as to give to its respective carrier such individually variable movements and speeds that the variable movement-s'of these carriers each actin transversel u on the variable movements of the other in said transverse parts conjointly determine the curved or irregular path of the cutting by said cutter conformably to a predetermined pat-tern.

5. In a milling machine for milling in a curved or irregular path, the combination with two parts or carriers, movable with respect to each other in transverse paths, of al milling cutter having a continuous independent rotary movement, with its axis at right angles to a plane parallel to the trans verse movements of bothof said parts or carriers, automatic means, for imparting such predetermined individually variable movements and speeds in said transverse paths to the respective parts or carriers that said carriers by reacting transversely, each upon the variable movements produced by the other, conjointly determine contormably with a predetermined pattern the curved or irregular path of the cutting by said cutter and cause the cutting to be done in said path, which automatic means consist of a single revolving shaft bearing and giving rotary movement to two peripheral cam-. paths, each shaped to produce conjointly with the other said variable movements campins moving in their respective camp aths, and connections between said campaths and. said carriers respectively adapted to transmit: said variable movements, and in cluding a bell-crank lever for changing the direction of movement for one carrier, whereby the carriers are caused to move in said transverse paths.

6. In a milling machine, the combination with two parts or carriers movable transversely with respect to each other, of two concurrently and continuously revolving cam-paths, a revolving cutter, a former, a former-pin, driving means connecting the respective cam-yurths with the respective parts or carriers. whereby the said parts or carriers are automatically driven with predetermined individually variable movements and speeds re-acting upon each other to con jointly cause the cutting to be done in a predetermined path, and elastic means for pressing the former-pin against the former during the operation of the cutter upon the work. i

7. In a milling machine, the combination with a work-carrier and a tool-carrier movable transversely with respect to each other, of two. concurrently revolving cam-paths, a

\VOllC-llOltlGl' carried by the worlccarrier, a

revolving cutter u'iounted upon the tool-car rier, a former, a former-pin, driving means connecting the respective canrpaths with the work-carrier and with the tool-carrier spectively 'EOIJHOVlDQ the same with pre determined individually variable novements and speeds re-aeting upon each other to conjointly cause the cut ting to be'done in a predetermined path, and elastic me is -for pressing the forn'icr-pin against the torn'ier during the operation of the cutter upon the work.

8. In a milling machine, the combination with two parts or carriers movable transversely with respect to each other, of two revolving cam-paths, a worlcholder, a revolvmg cutter, a former, a former-pin, driving connections between the respective parts or carriers and the respective cam-paths, where by the said parts or carriers are automatically and concurrently moved in transverse directions with predetermined individually Variable movements and speeds re-acting upon each other to cause the cutting to he done. in a predetermined path, springs for pressing the said former-pin against the said former during the operation of the cutter upon the work, and means for confining the said springs in a state of compression.

In testimony whereof, I have signed this specification in the presence of two subscribing wituesses.

CHARLES R. NORTH. \Vitnessesc S. E. SIAFFORD, Gr. J. Srarroun.

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