US978097A - Twist-drill machine. - Google Patents

Description

A. D.' WILT, Jn. TWIST DRILL MACHINE.

APPLICATION FILED OUT. 29, 1906. 978,097, Patented Dec. 6, 1910.

7 SHEETS-SHEET 1.

A.. D. WILT, Jn. TWIST DRILL MACHINE.

APPLIUATIUNHLED 00u29, 190s.

Patented Dec. 6, 1910.

'7 SHEETS-SHEET 2.

FIELE.

A. D; WILT, JR. TWIST'DRILL MACHINE.

'A APPLICATION FILE-D 00T. 29, 1906. K 978,097, 1 Patented Dec. 6, 191.0.

'1 SHEETS-SHEET a.

W/TNESSES /NVENTOH 'AERA/W' D' WLT'JR' A. D. WILT, JR. TWIST. DRILL MAGHINB.

APPLIOATION FILED 001'. 29, 190e.

Patented Dec. 6, 1910.

'I SHEETS-*SHEET 4.

PIE

JN VEN 'Ton n.7- JP? w D M A R B A Wl TNESSE'S,

A. D. WILT, Jn. TWIST DRILL MACHINE. APPLICATION ILED 90129, 1906.

Patented Dec. 6, 1910.

'7 SEHETS-BHEET 5.

, Fl E. E.

Ill/V FIL-3.7

WIT/#E5 E5 v ,NVEHTOR u 'ABR/HVL D- VYILT-JR. 'da 0MM-BY y l Y TT'Y5 A. D. WILTNTB. TWISI-1 DRILL MACHINE. APPLIUATION FILED 001229, 190s.

Patented De'c. 6, 1910.

'I SIHEETS-SHEET 6.

PIE-E1.

FIEL

N555 5 l m ATi-"Ki A. D. WILT, JB.. TWIST DRILL MAGHINE. APPLIOATION FILED 00T; 29, 190e.

' l'1 sHnETs-sHEET 7.

' WITNEssr-:s:

INVENTOR- Patemed Dec. 6, 1-910.

UNITED vs'riiriis- PATENToFFioE.

ABRAM D. WILT, AJR., OF DETROIT, MICHIGAN.'

TWIST-DRILL MGIHINE.

specification of Letters raient.

Application-filed October 29, 1906;` Serial No. 341,109. v-

To all whom 'it may concern:

Be it known that I, ABRAM D.- WILr, J r., a citizen of the United States of America, re-

siding at Detroit, in the county of Wayne I of an automatic machine for converting the bars of raw-stock into practically the finished product, more particularly by means of a gang machine in which various operations are performed at different 'work stan tions simultaneously.

I Vith theseand incidental objects in view the invention consists in the novel organization of the machine as hereinafter set forth and a preferred form of embodiment of which is illustrated lin the accompanying drawings forming part of this specification. l In' the drawings,- Figure 1 is a plan view vof the machine; Fig. 2 is a sectional side elevation thereof; Fig. 3 is a cross section on line 3 3, Fig. 2; Fig. 4 is a cross section on line 3-3, Fig. 2, looking in the opposite direction; Fig. 5 is a longitudinal section through the stock feeding mechanism; Fig. 6 is a perspective view of the milling and cutting off mechanism; Fig. 7 is a section on line 7 7, Fig. 4; F igpS is a sectional end elevation of the mechanism illustrated in Fig. T; Fig. D is a section online 9-9, Fig. 7; Fig. 1 0 is a section on line 10--10, Fig. 7; Fig. 11 is a sectionalized and enlarged View of parts shown in Fig. 2.

-In the process of manufacturing twist drills, it has heretofore been proposed to cut the bars of raw-stock into blanks of suitable length. These blanks are thenV dressed or shaped by proper. tools, and subsequently the spiral grooves are cut or milled therein, the pitch of the spiral being increased and the depth of the ggjroovc tapered from the point toward tlul shank. In my improved machine. those several operations are performed s|ircossivi-l-y on the work, but there are a i'iliiralitv of work stations so that the differentstagcs of the work progress simultaneously at tlicdilfercn'. stations. That is. I have provided a tool holder having a plurality of tools, with a blank carrier confrontvimei-atea Dee. e, 1910.

ing this tool holder and carrying chucks or devices for holding a plurality of blanks corresponding to the numberK of tool stations. Means ai'e provided for cutting off the necessary lengthA of blank from the continuous bar or raw-stock 'and this blank is gri ped by its corresponding blank carrier an( then the blank carrier is rotated so as tocarry this blank to= another station where another stage-of the work is performed. In this way as all the blank carriers areprovided with blanks, a different stage ofthe work is being simultaneously carried on at .each tool station, and then the rotation of the bla-nk carrier advances' each blank to its next tool station for its next succeeding operation. Means are also rovided for discharging'the nished prot uct after all the successive operations have been performed on it.

It has heretofore been proposed to have a- 4plurality of work stations whereby a turret head of tools may operate-in this manner `vsimultaneously upon a plurality of blanks,

with provisions for rotating'the bla-nk carrier so as to produce the successive operations onl each blank. But in my present machine I have provided devices by which there is a certain correlationv between the work performed at one station and the Work performed at the succeedingstations. That is, iii-the making of such articles as twist drills,

,if the first operation comprises the dressing 'or shaping of the blank and cutting of the same from .the bar of stock, and then the next operation to consist of milling the spiral grooves, the operation of milling the grooves would be one involving considerable length of time as compared with the mere operation of shaping and cuttingof the blank.

I have economized timein the present machine by dividing up the cutting of the spiral groove intd successive stages, the rst groove or mill cut being a comparatively shallow cut at one station, whichV cut is then deepened by a still further cut at'tl'i'e next station, and so on until the proper depth of out is secured. And in connection with this segregation of the work, I arrange for tapering the grooves at one of the stations and, if desii-ed, one of the stations may also be used .the machine can operate with great rapidity which I have adopted will now be described.

and'turn out a great many drills in a shoit space of time. It will be noted, however, that in order to accomplish this result it is necessary-so to organize the machine` as to' maintain a certain definite vrelation between the work performed at certain successive stations. rlhat is, if the mill cutters at one station are to cut the spiral groove to a partial depth, and then the work is to be carried on to the next station where the groove is to be cut slightly deeper, it is necessary to make sui-e that the tools at this succeeding station will traverse precisely `the saine spiral patl.; and so on for the succeediiig stations where Work is performed upon this saine spiral groove. 4 A

It is to-accoinplish the purpose set forth that I'have designed my present machine which will enable ine to cut blanks from a continuousbar of stock, shape them at one station, and perform the various cuts and operations upon the spiral grooves at succeeding stations, with the final delivery of the finished product, A nd this may be applied to the production of other articles than twist drills where it is a requisite that there should be the aforesaid relation between the work traced at one station and the Work at succeeding stations. lVith this general description, the specific form of mechanism A is a suitable frame work. B is a. revoluble hollow mandrelvmount'ed upon this frame, through which the bars of stock are fed. -The feeding mechanism preferably comprises a reciprocatory inner member C, which frietionally engages the stock bar, and carries it forward within the mandrel ble mandrel F.

together with a non-reciprocating chuck D,

which clamps the stock and holds it during the return movement of the-member C. The chuck D is operated by a sliding collar E on the mandrel through the medium of the bell crank levers E. These levers actuate the jaw member Dl longitudinally in relation to the outer sleeve D2, .the latter being provided with a tapering shoulder D3 engaging the jaws in clamping the saine against the stock" bar. The member C is reciprocated through the medium of a lever .C having a bifurcated end engaging the` collar C2 on the member C.

The rst operations performed upon the stock are the dressing to proper size and the cuttin oil' of a blank of the pro er length. T ese two operations are pre erlably performed simultaneously, and during the interval in which the stock is clamped by .the chuck D by the following mechanism. F is a non-revoluble mandrel which is in axial alinemeiit with the hollow mandrel- B and is mounted in suitable guides for longitudinal reciprocat-ion. F is a tool mounti tation by a lug or roll H ed in the mandrel F adapted to take a dress-4 I ing cut upon the projecting .portion of the i mandrel F. `The cutter G is shown in Fig.

(i, and also in Fig. 2,-and is driven by a gear wheel yY', later described', which'gear l meshes with a small pinion fast on the shaft carrying the cutter G and onthe opposite side of its supporting bracket as shown vin Fig. 'lhe movement of these parts is so timed that before Athe projecting portion of the stock is severed it is dressed to size .Y

by the tool F', and is held by the nonrevolu- The operations linst described will produce blanks of the proper length and diameter ready for the cutting of the spiral grooves. The latter operation requires the removal of more stock `than in 4either the cutting olf or dressing operations and would ytherefore require a longer time interval for its 'accomplislnnent. I have therefore divided this operation into several steps, each of which may be performed in the time interval required for .the dressing and cutting oil' and which together will complete the spiral grooving of the blank. Furthermore, these 9 several operations are performed while the lblank is in engagement with a single work holder mounted on an intermittently moving carrier.

As illustrated, l--I is a revoluble head, or cai'rier, mounted in the frame, and carrying a series of work holders I, which successivelyreceive the blanks from the non-revoluble mandrel F, and present .them in rotation to the groove forming instrun'ientalities, The carrier H is provided with means'for both intermittently revolving it and also for reciprocating it in a direction parallel to the axis of rotation. mounted on'a shaft H,which is feathered within a sleeve H2 revolubly mounted in bearings H3 in the frame. H4 is a lever for .actuating the shaft(longitudinally. H5' is a star wheel .on the qsleeve H2 which is intermittently actuated through a partial roon a continuously rotating head H7. This star' wheel H5 is of the ordinary Geneva locking wheel style, having the operating notches with intervening locking surfaces as clearly shown in Fig. 3. The aforesaid roller H, carried by the revolving head HT, engages the successive notches of the Geneva star wheel H 5 to rotate-the head H, and for locking the head during the period of rest of the carrier H, the revolving head HT provided with the, rojecting flange shown in Fig. 3 which -confhrms to and engages the said locking surfaces of the star wheel and one portion of this flange beingA broken iooA As shown, the head H is l without further description. 1

The work holders I are in theform of chucks tor engaging andclamping the blankwhile in the non-revoluble mandrel F. The jaws of these chucks are operated by a rod I passing centrally through the work holdr ers,a nd provided with shoulders for engaging with a cooperating member as will be hereinafter explained. The arrangement is such that whenv the carrier H is stationary, one of the Work holders is in axial -al'inement with the work in the non-revoluble' mandrel F, and While in this position the. open-jaWed chuck isinoved forward by the longitudinal movement of the carrier to embrace the projecting end of the blank. The rod I is then operated to close the jaws of the chucky and clamp the blank, after which the holder is again moved longitudinally inthe reverse direction,l withdrawing the blank from engagement with the non-revoluble mandrel F. All of these movements occur yduring the interval 'in which the carrier is locked from rotation by the star Wheel actuating mechanism, -so that when the rotary movement is again imparted to the carri-er the blank will have been disengaged from the -mandrel F and lirrnly clamped by the jaws of the holder. -Thus it is free to be carried by the holder through a partial rotation which will bring it into lregistra-tion Wit-h the iirst vof the groove cutting devices.

In cutting the grooves in a drill, it is usual to progressively increase the pitchrof the spiral from the point toward the shan-k of the drill and also to diminish the depth of the groove from point to` shank. With the present construction, these grooves are cut by stationary positioned milling cutters and by the combined rotary and longitu dinal movement of the Work holders in relation thereto. The longitudinal movement of the holder is that which is imparted to it by the carrier H when actuated by the lever H and is the same movement that is cm1 ployed for engaging a succeeding holder of the series With a dressed and cut off blank `in the mandrel F. The rotary movement-of the holder is simultaneously imparted tol it by the following mechanism, see Figs. 2 and 11.

J is a second yhead adjacent to the head H and mounted upon the sleeve H2 intermediate the shaft and lstar Wheel H5, being feathered to each. J is a carrier on the sleeve H2 Which is in engagement With ay lever J2 by which said sleeve may be longitudinally reciprocated .in relation to the` yFig. l1.

vmounted thereon in axial alinement With each of the Work 'holders I a project-ing pin K having a spiral thread thereon Which engages With a complementary internal thread in the holder I. 'The pitch of this spiral thread is such that a relative movement of the heads J and H Will-cause the synchronous rotation of all ofthe holders I in their bearings in the carrier head H, the rotationy being in o-ne direction, as the heads J and H approach each other and in the reverse direc tion as they are separated.` Inasmuch,

however, as both of the heads H and J are simultaneously moved longitudinally in the samev direction, it is evident that the rotation of the holder I can only be produced by their ditferential movement.

From the description above given, it Will be understood'that the blanks, While held by the Work holders I, will be longitudinally reciprocated in relation to the `stationary milling cutters, which will operate thereon to cut the grooves.v .Furthermore the rotary movement of the holders, caused by the differential longitudinal movement of the head J, Will affect the cutting of the spiral-,grooves in the blank, the pitch of the spiral being determined by the differential. Thus, to progressively increase the pitch of the groove as is desired, it is only necessary to progressively accelerate the movement of the head J, which may be accomplished by properly fashioning the cam J 3, as shownin To cut the entire length of spiral groove in the time interval in whichv the dressing and cutting off of the blank is effected, it is impossible to cut the full depth of groove in a single operation. I -have therefore arranged a plurality of milling cutters at the several station points of the holders in the intermittent `movement of the carrier each succeeding cutter deepening the groove until the required depth is obtained. As illustra-ted, the cutters are arranged atfthree differentl points, and, as two opposite grooves are to be cut in the blank, a pair of opposed millersis arrangedlat each station. These millers L and L are mounted upon shafts L2 and L3 extending at opposite angles to the axis of the bla-nk. These shafts Aare driven through a suitable gea-r train, L2' which imparts to the millers the desired speed of rotation. The Work is guided,

While operated upon by the millers, by passing into engagement with. a hollw mandrel M which preferably is of a size to closely fit` the blank and hold it concentric with its .axis of rotation during the cutting operation. Thus, durin theforward movement of the carrier hea H, blanks will be engaged with the mandrel M at each of the station points, and will be simultaneouslyV advanced longitudinally-and rotated to produce the spiral groove, During the return movement of the .head H a corresponding reverse rotary and lon itudinal movement is given -to the blanks, W ich permits the millers to retrace the grooves cut in the forward movement. To avoid possibility of the blanks sticking in the hollow' mandrel, due to the bur raised by the cutting operation, I preferably provide means for expanding the diameter ofthe mandrel during thereturn movement of the blank. To this end, each of the mandrels M is longitudinally slotted, at Ml see Figs. 8, 9 andl 10, and the "two sections on opposite sides of the 'slot' are provided with ears M2 having' right and.

left `threaded apertures engaging corresponding threads upon'a shank M3. This shank has mounted thereon a pinion -MJl which engages with an internal rsegmental gear .wheel M5, the arrangement being such that during the rotation of said gear wheel the segment will engage with the lpinion, and cause the rotation of the shank M3v so as to spread theears M2 and expand the mandrel M. A vsecond internal segmental gear-l wheel M is arranged upon the shaft of the 'gear wheel M5, `but with the gear segment located' at a diametrically opposite point. This segmental gear wheel MG engages with a pinion M" on the shank M3 after a half revolution of thev wheels M5 and M, and causes the-reverse movement of said shank and consequent contraction in the diameter ofthe mandrel M.

es has been stated, the grooves cut *in the drill diminishu in depth toward the shank. This taper may be produced in each of the cuts used in forming the grooves, but, for

simplicity, I preferably form straight cuts,

i -or cuts of uniform depth in the first? two voperationsand the tapering-cut in the final operationi To produce this taper, the millers L and L v'are gradually separated during theprogress of the work, which may -be accomplished by the following mechanism, see Figs. 7, 8, 9'and '10. lN and N are bearings for the millers shafts L? and L3, which `are arranged to slide in guides OJ and .0.

and P are threaded Shanks engaging cor-v respondin :threaded apertures A.in said bearings and'v aving'mounted thereon the pin-L ions'Q, and Q- which engageopposite sides' .of va double rack bar R. "This rack bar,1s

actuated' by an arm S which in turn is mounted for actuation by the reciprocation 4of thecarrier head H. This arm S is also showniln FigQQ extending upward from-the l left hand end of the horizontal shaft forming the extension of the shaft H', which' shaft projects into bearings as shown broken away m said figure so as tovpermit yhorizontal reciprocation of the entire shaft for the purpose 4of moving the carrier H laterally'as described. By means of' this mechanism, the forward movement of the carrier; H will cause the arn S and 'rack bar R to rotate the pinions Q and Q', and the threaded 7,5 Shanks P and P', which movement will causetfhe sliding: movement of the bearings `N and N in their guides O and O', so as to separate the millers from each other, and gradually to' withdraw them from the work. 80 As the amount of movement'is not great, the shafts L2 and'La arepermitted to tiltin their stationary bearings withoutr interfering with the drive connection. As shown in Figs. 7 and 9, the aforesaid arm S has a 85 lbrush attached thereto which extends into the inner bore of the mandrel M sc that upon the reciprocat-ionv of the arm S, in 'the manner A previously described, the 'brushy moves in and out of the mandrel to keep it clear from any p'ssible remnants of cuttings. The final" operation performed on the work is the cutting away' of the stock toformv the desired clearancef for the drill. This operation is performed at another stationl point and preferably by millers suitably arranged to take the required cut. As this clearance cut exactl follows the spiral ofthe groove, it is evi ent that it maybe produced by millers in stationary bearings.

The various parts of the mechanism which n have been described are al1 driven in 'timedf relationytoeach other by a suitable conun'on'ije driving mechanism, such as the main drive" shaftl T, and counter -shafts U and' V. The' 105 I wheel H7 and the cam J3 are mounted'upon the main shaft T and the cam Jgvon the shaft V. Upon the shaft U are moun ed the 1 cams U, U2A and U3. The camU..T`4` ctuates a lever U4, which reciprocates thelmandrel 110 F, as has been described'. "The "'Cam1U2 actuates the sliding carrier E for actuating the chuck D, and the cam U3 operates the lever C` for reciprocating the,,sleeve-'(1y For operating the chuck he"zwork 1,15?

holders I, the actuating rods -arepassed centrally through the threaded'pins K, ,and are providedwith heads lI2 which are engaged by the member Jfwhenseparated from I th `carrier lH. This will cause the drawing rearwardly of therodsI vand the clamping of the chucks. The chucks are'opened at the final station point -for completmgthe. v

`cycle of the .operations by' the strikingv against' a stationary stop W.' 'Th1s, as 125 shown, isl in the form of a pivotedyarm secured to'the'frame and held in normal position by'a spring' W. As showmin Fig. 2, each of the said actuatin rods I extends through its spirally threa' ed. pin K and at,l 13o its left end carries the movable jaws of the chuck or work holder. The inner ends of these two jaws are provided with rollers, as clearly shown in Fig. 2. which rollers engage inclined portions of the adjacent body of the chuck holder so that when the rod I is pulled to the right the rollers will ride up on the inclines and carry the opposite ends of the jaws together so as to clamp the work. And when the rod I is moved in the opposite direction,` the rollers retreat from the inclined portions and the springs which are shown as bearing upon said roll- ,ers cause the opposite ends of the jaws to open and releas-e the work. This opening 0f the jaws .by the forcing of the rod I to the left in Fig. 2 is produced by the striking of the head I2 against vthe stop W as above stated. The upper portion of this stop IV is sufficiently rounded to permit the hcadI2 to ride up 'over the stop IV when the carrier H is rotated to bring this particular chuck or work holder into position. This depresses the stop IV against its spring I T at this stage of the movement, but when the carrier H moves forward, the rod I goes forward with it and allows the stop W to spring up ,into place so that upon the retraction Vof the carrier H the head I2 then strikes the side of the stop IV and forces the .rod Il to the left, ,thus releasing the jaws ofthe chuck or lwork holder and dropping the finished product into any suitable receptacle therefor, such as shown in Fig. 2 attached to the'arm S and resting on the shaft H and reciprocating back and forth with the arm S.

In the complete operation of the machine,-

the bars of stock are fed into the hollow mandrel B and are then automatically fed by the operation of the reciprocatory' sleeve chuck through a gear train Y, and the cut offl miller G is driven through a gear train Y.

. The miller Gr is fed inward by the movement of a lever connection Z controlled by cam Z upon the shaft U and the mandrel Fis fed over the projecting stock by the cam U and lever' U4. This will affect the dressing down and the cutting oif, as has been previously described,'and at the 4completion of the operationthechuck of the registering holder I will be engaged with the end of the blank projecting through the end of the hollow mandrel F whereby said blank may be withdrawn upon the out-ward movementof the carrier. The operation of succeeding cutters has been fully described, and it will be understood that each reciprocation of the.

carrier head H will affect an operation on each of the blanks, and that one drill is complete'd and disengaged from its chuck. The disengagement is eEected by the striking of lfrom one stationto another.

the end of therod I against the stop W,

then knocks the shank of the drill from engagement therewith. All of theseoperations are performed automatically and it is only necessary for the workmen to feed new stock bars into the bollo-w mandrel .B as required.

For changing the form of the spiral groove cut in the drills, it is only necessary to change the relative operation of the heads H and J. This may be accomplished by providing a shifting fulcrum, as, for example, the member J5 for the levers H4 and J2. By adjusting this fulcrum, the proportion of the levers is changed, and will result in an alteration of the pitch of the spiral. This adjustment is shown in Fig. 2, also in Fig. ll, the bracket or member J5 being seated in avsuitable slideway or guided7 on the outer side of the upright framework of themachine. This permits the .vertical adjustment of the bracket J5 so as to adjust the pivotal points of the levers H4 and Jgas described.

It will be seen that I have organized the machine so that for those successive stationsI whereat the spiral groove is retraced and cut successively deeper and deeper, the machine automatically maintains a certain definite relation between the operations performed at such successive stations. The blanks are separated bodily and carried separately Coperating with the tool cutters and the blanks carrying devices, is this path-controlling mechanism which insures or causes the tools at the succeeding station to traverse precisely the same spiral path on the work as at the preceding station. That is, thismechanism may which first opens the jaws of the chuck and in this sense be said to operate correspondingly at each station, and where the word correspondingly 1s used 1n the claims 1t is to be understood as having the characteristics above indicated and explained.

fhat I claim as my invention is:

1. The combination with a work carrier having means for holding a plurality of separate blanks, of a plurality of groove cutters at different stations set for successive cuts upon the work, and mechanism operating correspondingly at each station for presenting the work to cause the successive cutters to trace the same spiral path in relation to the work, and to successively deepen the groove therein.

2. The combination of means for carrying a plurality of separate blanks to a plurality of stations, groove cutters at different stations set for successive cuts, and mechanism operating simultaneously and correspondingly at each station for presentmg the work to cause the successive cutters to trace the-saine spiral path upon the work 3. The combination-of meansfo'r carryin a plurality of separate blanks to a plura ity ogf stations, groove cutters in fixed' location at different stations set for successive cuts, and mechanism operating simul- -taneously and correspondingly at the different stations for'feeding the Work through the same spiral path in relation tothe suc-v cessive stationary cutters. 4. The combination of means for periodically advancing a stock bar, means operating While saidbar is 'in -ixed position for dressing the end thereof and severing the dressed portion, a Work holder for engaging the severed blank, a plurality of groovey cutters located at dierent stations and set for successive cuts, and means for inter- .mittently vmoving said Work holder to. the successive stations, and means for moving the`workfwhile at said stations to present thework correspondingly to trace the same spiral path in relation to the successive cutters.

5. The combination with a cutter' and a work holder, of means for moving the one in'relation to `the other, comprising a mas` ter spiral and a coperating sleeve, and- Vmeans for differentially actuating the same in a direction of the axis of the spiral Whereby a spiral trace of the cutter upon the Work is produced.

6; The combination lwith a cutter and a.

work holder, of means forvvproducing a. spiral trace of vsaid cutter upon said Work comprising a master spiral and an engaging-member, means for moving said spiral and coperatin member differentially in f the direction o their axis, and means j for varyi the 'diferentiaL l 7. T e combination with a Work holder and a` cutter, of means for producing a spiral trace of said cutter upon the' Work jcomprising a non-rotatable ymaster spiral and a1" rotatable engaging member,A and means for-moving said spiral .and engaging member' differentially in the direction [of their axis.

8. The combination of a revoluble member, a non-revoluble'member'having a spiral ythreaded engagement with said revoluble meinber, means .for differentially'. moving said members axially, and. means for vary- 'ingthe differential. f

'9. The comb'` ation of a rotary Work carrier, of a plurality of revolublework holders `mounted i'ipon said"carri'er, a non-rev` oluble member having aA vspiral threaded engagement with each of said Work holders, a-member rotatin with said work carrier to which all of said non-'revoluble members are attached,`fand means for differentially moving said Work carrier `and (xo-rotatingl member in the direction` of their axis to cause the simultaneous andcorrespondingly spiral movement of all of said work'holders.

10. The combination with a rotary Work carrier, of a plurality of work holders revolubly lmounted therein, a shaft upon which 'said Work carrier is mounted, a' member feathered upon said shaft to rotate therevvtith, a non-revoluble member having' a spiral threaded engagement with 'each of said revoluble Work holders, said non-revoluble members being secured in said mein- Vber feathered upon the shaft, and means for actuating the latter member and said shaft differentially in the direction o f their axis to produce a correspondingly spiral movement in all saidwork'holders.

11. In a machine(A of the character described, the combination with a tool holder yhaving a plurality of tools, and a blank carrier having a plurality of blank holding devices confronting the respective tools;V of means for producing intermittent relative rotation between the tool holder and the blankcarrier whereby to cause eachblank in turn to confront the successive tools; means for operating the tools; reciprocating means for producing relative longitudinal movement of approach andl retraction between said tool holder and said blank carrier to effect the Working of the tools upon .the blanks; and means for producing rela# tive angular rotation between the tools and their respective confronting blanks duringv the said movement of approach Vand retraction, whereby to cause the tool to operatespirally upon its blank, said latter means" being correlated With'the aforesaid reciproeating means to trace the same Vspiral pathl vat each station.

l2. In a machine of the character de v scribed, the combination with a tool holder having a plurality'of'tools, and a blank car# rier havingr a .plurality of blank holding de vices confronting the respective tools; of means 'for producing intermittent relative rotation betweenl the tool holder and the blank carrier whereby to cause each blank vin turn to confront the vsuccessive tools ;y

means. for operating the tools; reciprocating means for producing relative longitudinal movement of approach and retraction between lsaid tool holder and said `blank car rier to effect the Working of the tools upon the blanks; and means for producing defined revoluble movements of said blank holdingl devices during. the Working of the tools thereon, said latter means being correlated with the aforesaid reciprocatingl means to produce corresponding revolubleY movements of said blank holdingdevices at each stai tion dependentnpon the relative longitudi-y nal distance between the tool carrier and the blank holder. 4 y

13. In a machine of the .character described, the combination with a tool holder having a plurali-ty of tools, and ablank carrier having a plurality of blank holding devices confronting the respective tools; of means for producing internnttent relative rotation between the tool holder and the blank carrier whereby to cause each blank in. turn to confront the successive tools;` means for operating the tools;reciprocating means for producing relative. longitudinal movement of approach and retraction bctween said tool holder and said1 blank carrier to eltect the working of the tools upon the blanks; means for producing relative angular rotation between the tools and their blanks whereby to blank, said latter means being correlated with the aforesaid reciprocating means to trace the same spiral path at each station; and means for varying said angular relative movement between the tool and its blank. f

`let. In a machine of the character described, the combination with a tool holderV4 having a plurality of tools, and a. reciprocating blank carrier having a plurality of blank hol-ding devices confronting the respective tools; of means for intermittently rotating ,said blank carrier to cause each blank in turn to confront the successive tools; means for operating said tools; reclprocating means for moving said blank carrier longi- A tudinally to approach and recede from the tool holder to effect the working of the tools upon the blanks; and means operating correspondingly at each station for producing defined revolublemovement of said blanks in one direction the same definite extent at each station during the forward reciprocation of said blank carrier, and spondingextentin reverse direction during the backward reciprocation of the blank carrier whereby to cause the tool to traverse the ing of the tools upon the correy Witnesses same path upon said forward andv backward reciprocation.

15. In a machine of the character dcscribed, the combination with a tool holder, and rmeans for operating said tool holder, of a movable lank carrying frame; a second movable frame cooperating withsaid blank carrying frame gnieans for producing differential movement between said frames; and means connected with the blank carriers and operated by said frames whereby to produce a diferential extent blank. Y f

16. In a machine of the/character described, the combination with a tool holder having a plurality of tools, and a reciproeating blank carrying frame having a plurality of blank holding devices confronting the respective tools; of means for intermittently rotating said blank carrying frame to cause each blank in turn to confront the successive tools; means for operating the tools; means for moving said blank carrying frame longitudinally to approach and recede from said tool holder to effect the workthe blanks; a second movable frame cooperating with said blank carrying frame; means for producing differential movement between said two frames; and connections between -said blank holding devices and said frames' whereby toproduce similar differential extents of revolution of said blanks in the various positions to which said blank carrying frame is moved.'l v v Intestiinony whereof I aix my signature in' presence of two witnesses. t

ABRAM D, wnfr, Ja.

AMELIA WIHIAMS, NELLIE KmsELLA.

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