US2142557A - Automatic lathe - Google Patents

Description

' Jan. 3, 1939. i CONE 2,142,557

AUTOMATIC LATHE Filed Jan. 28, 1955 10 Sheets-Sk 1e et 1 Jan. 3, 1939. F. L CONE V AUTOMATIC LATHE Filed Jar l. 28, I935 lo sh ets-sheet 2 Jan. 3, 1939. F. L. CONE ,5

AUTOMATIC LATHE Filed Jan. 28,-1935 1o shee c -sheet 3 Jan. 3, 1939.. F. CONE v 1 A TOMATIC LATHE Fil'ed Jan. 28, 1955 '10 Sheets-Sheet 4 Jan. 3, 1939. F. CONE 2,142,557

AUTOMATIC LATHE Filed'Jan. 28, 1935 lO.Sheets-Sheet 5 Jan. 3, 1939. F. CONE 2,

AUTOMATIC LATHE Filed Jan. 28, 1955 10 Sheets-Sheet s F. CO NE AUTOMATIC LATHE/ Jan. 3, 1939.

10 Sheets-Sheet '7 Filed Jan. 28,- 1955 Jan. 3, 1939 F. L. CONE I AUTOMATIC LATHE Filed Jan 28, 1935 10 Sheets-Sheet 8 \N N\\ Qx Ja'im. 3, 1939.

F. L. CONE AUTOMATIC LATHE Filed Jan. 28, 1935 7 l0 Sheets-Sheet 9 "W W W;

Patented Jan. 3, 193 9 UNITED STATES .w'rom'no LATHE Frank L. Cone, Windsor, Vt.; Raymond H. Cone, Henry P. Chaplin, and Horace I. McClary, all of Windsor, Vt., executors of said Frank L.

Cone, deceased Application January 28, 1935, Serial No. 3,765

24 Claims;

This invention relates to automatic lathes and more particularly to lathes of the multi-spindle type. It has for an obiect to produce a machine capable of very high speed. To this end it is provided with means for cushioning the stopping of various parts, which, when moved, travel at high speed. As applied to a multi-spindle machine it also provides for improved carrier means for the stock by which the stock may be moved from one to a succeeding tooling station with great rapidity and with a minimum of noise, vibration and wear on the stock and its carrying parts at all times.

A further object is to improve the tool-carrying members, the stock feeding and holding mechanism and various other parts such that accurate high speed automatic functioning is facilitated.

A further object is to provide constructions facilitating changing of the machine set-up for difierent tooling operations whereby a minimum disorganization of the machine is necessary for this purpose.

Still another object is to provide a warning to the operator in case of heavy over-load on the machine.

Further objects and advantages will appearfrom a more complete description of an embodiment thereof shown in the accompanying drawings in which Figure 1 is a front elevation of a multi-spindle machine constructed in accordance with this invention.

Figures 2 and 3 are left and right end elevations, respectively, of the same embodying the stock reel.

Figure 4 is a detail section on the line 4-4 of Figure 2.

Figure 5 is a top plan of the machine.

Figure 5a is a detail section on the line 5a5a of Figure 5.

Figure 6 is a central diagonal section to a larger scale through the stock reel.

Figure 7 is a detail section to a larger scale on line 1---'! of Figure 3.

Figures 8 to 10, inclusive, 12 and 13 are detail sections on the correspondingly numbered section lines of Figure 7.

Figure 11 is a detail section on the line H-Il of Figure 10.

Figures 14 and 15 are detail front and end elevations, respectively, Figure 15 being partly broken away showing tool slide limit mechanisms.

Figures 16 and 1'7 are detail sections on the correspondingly numbered section lines of Figures 14 and. 13, respectively.

Figure 18 is a detail section on the line I8-|B of Figure 8.

Figure 19 is a detail section on the line l9-I9 of Figure 7.

Referring to the drawings, at l is indicated a machine bed. Standards 2 and 3 extend upwardly from this bed adjacent to opposite ends and support thereon a frame member 4 which is arranged substantially parallel to the top face of the bed I, being spaced thereabove and extending therealong.

Work holder and driving mechanism Within the frame of standard 2 is positioned a turret or drum 5 which supports a plurality of work holders indicated generally at 6. This drum, as shown best in Figure '7, comprises a spider Ill having end plates II and I2 and an intermediate lateral partition l3, these parts being journaled at their peripheries within bearing members 14, I5 and I6 which are substantially rectangular in outline and are enclosed by the wall portions of the standard 2 and the angle connecting members l1, I8, l9 and 20. The work holders 6 are journaled in the partitions l2 and I3 and may be formed substantially like the work holders shown in my Patent No. 1,271,540. Four of such work holders are shown, though there might be more or less as desired, and they are arranged in circular series in substantially parallel relation about naled a shaft which has a gear 26 fixed thereon meshing with gears such as 21 fixed to each of the work holders 6, so that as theshaft 26 is rotated all the work holders are turned simultaneously. The shaft 25 is coupled to a shaft 33 which extends lengthwise of the'machine and has a portion 3| journaled in a bearing 32 in the inner end plate 33 of the standard-3. Within this standard 3 the shaft has fixed thereon a link belt gear 34 and also a narrower link belt gear 36 inwardly of the end bearing member 36. The gear 34 is connected through a link belt 31 (see Figure 8) with a driving gear 38 fixed to a shaft 33. As shown best in Figure 18, the shaft 33, inwardly oi the end wall 33 has fixed thereto a gear 40 which meshes with a similar gear 4| fixed to a drive shaft 42. This drive shaft extends entirely through the standard 3 and outwardly of the end plate 34 of this standard it may have secured thereto suitable means such as a pulley (Figures 1, 2 and 3) by which this shaft 42 may be driven from a motor 46 or other suitable source of power. By this means the various work holders in the drum are caused to rotate during the normal operation of the machine.

Tool carriers and whtrol mechanism 1 Between the frame 4 and the bed I. are arranged slides for carrying tools in position to operate on work carried by the several holders mounted in the work-holding drum. Certain of these tools may be carried by a slide 50 mounted for movement parallel to the axes of the work holders and supported on the upper face of the bed I. There may also be one or more upper tool carrier slides such as H (see'Figures 1, '7 and 9) which are mounted for sliding movement on one or more guide bars 52 supported in'a bracket 53 secured to the lower face of the frame member 4 and in adjustable links 62 pivoted at any selected of 1 three points within slots in the lower portions of actuating arms 64. These actuating arms are fulcrumed, as on the pins 65 supported from the frame 4, and their upper ends are provided with cam follower rolls 66 which are actuated by suitable cams 61 (Figure 7) on a cam drum 10, the actuation of which will be later described. The slide 50 is connected through a link 15 pivoted thereto at 16 to a rock arm 11 (Figures 5 and 9). This rock arm is of general U shape and is pivoted at its upper and lower ends on a pivot shaft 18 journaled in upper and lower bearings 18 and 80. The upper arm member 8! carries a cam follower roll 82 which is actuated by suitable cams 83 (Figure 7) also secured to the cam drum 10.

In order that the lower slide 50 may be moved backward and forward at the high speed essential for a high speed machine, provision is made for cushioning its motion adjacent to opposite ends of its stroke. As shown in Figure '7, this means comprises a dash pot cylinder 85 suitably secured on the bed I and within which rides an elongated piston 86, the reduced extremity 81 of which is secured as by threading into the block member 88 secured to the pivot pin 16, as by the set screw 88. The opposite end of the cylinder 85 from that through which the stem 81 extends may be closed off by means of a tapered threaded plug 88. The piston 86 is of sufliciently loose fit within its cylinder so that air compressed between the piston 85 and the head end 30 of the cylinder may escape therepast when the piston moves toward the head and so that air may pass in from the opposite end of the cylinder past'the piston 86 when the air between the piston and the head 80 becomes rarefied by motion of the piston 86 outwardly. The clearance between the piston and the cylinder is so propor; tloned as to produce the desired cushioning effect for the tool slide 50 and the parts carried thereby. Any'suitable tools (not shown) which it is desired to employ may be mounted on this slide 58 and these may operate on one or both of the pieces of stock carried by the work holders at the two lowest stations of the work holder drum.

The first station where the first tooling operations are done in the work is the rear lower station, from which the work is indexed to the forward lower station, then to the forward upper station, and then to the rearward upper station, where the finished work is cut off and the stock is fed forwardly for a-succeeding set of cutting operations.

Similar dash pot mechanisms for cushioning the motion of the upper slide or slides 5I may be employed, the attachments of the pistons to the slides being indicated on Figure 9 at 85.

Beside these two holders which operate substantially parallel to the axes of the work holders, other tool carriers may be employed which move in from front and back transversely to the direction of these axes and from and toward the drum. Such tool carriers are shown in Figures 9 and 10 at I00, IOI, working inwardly from the front face of the machine and at I02 and I03 working in from the back face of the machine, these slides being mounted on front and rear slideway members I05 and I06, respectively. Each of these slides is arranged to support a tool carrier such as IIO having a tool III secured at its forward end and held in position by the pivoted strap elements II2 which may be turned to release or secure the holders H0 in position.

These slides I00 and IOI are arranged to be moved in and out by front controlling mechanism shown in detail in Figures 10 and 11. This mechanism comprises a rock shaft I20 having pinned to its upper end a hub member I2I integral with an actuating arm I22. Also keyed to the shaft I20 near its lower end is a hub member I23 having a forked arm I24 between the sides of which is pivoted onthe pin I25 a link I 26. The outer end of this link is pivoted as at I21 (see Figure 10) to a threaded bar I28 adjustably secured to the end wall member I29 of the tool slide IOI. Beneath the collar I2I the rock shaft I20 has journaled thereon a sleeve I30. This sleeve is supported on and is journaled in a cross frame member I3I, and beneath this frame member it has clamped and keyed thereto a split collar I32 having a bifurcated arm I33 integral therewith. Between the sides of this arm I33 is pivoted a link I34 the opposite end of which is pivoted within the forked extremity of a bar I35 having a threaded portion I36 adjustably secured to the outer end wall I31 of the slide I00. Above the frame member I3I, the sleeve I30 is provided with an actuating arm I40. Rocking of the arm I22 thus is caused to move the lower slide I 0| in and out and rocking of the arm I40 moves the upper slide I 00. Similarly the rear tool slides I02 and I03 are actuated by rocking of arms I50 and I52 at the rear of the machine, these being connected to the upper and lower tool slides I 02 and I03 similarly to the connections to the upper tool slides I00 and IN. Thearms I22, I40 and I 50 and I52 are bifurcated for the reception of actuating links I55, I56, I51 and I58, respectively.

As best shown in Figure 5, the link I56 extends to a cam follower slide I50 having a cam follower I 6| cooperating with suitable cams I6I0 (Figure 7) ona cam drum I62. The link I55 extends to a similar cam follower slide I63 carry- -ing a cam follower I64 cooperating with cams I640 (Figure 7) on the cam drum 10. The rear link I58 is attached to the follower slide I65 carrying a cam follower I66 to be actuated by cams I660 on the drum I62 and the link I51 is attached to a follower slide I 10 having a cam follower III controlled by cams I1I0 on the cam drum 10.

The limits of motion of the slides I00 and I03 toward the work are individually determined for each indexed positionof the work holder drum. This is accomplished by means shown best in Figures 14 to 16. Referring to these figures, at I 80 is shown a link pivoted at its upper end to an arm I8I carried by a rock shaft I82. This link I80 carries a pair of headed stop elements I83, the upper of which cooperates successively with adjustable stop screws I84 threaded through a bracket arm I85 secured as by screws I86 to the top tool slide I00. A lower stop element I83 carried by the bar I80 is positioned to cooperate with a similar set of adjustable stop screws I88 carried stations beingshown herein, there are likewise four each of the stops'l84 and I88, which are adjustable independently of each ,other. The bar I88 rests on its rear face directly against'the outer face of thefsupporting standard 2 so that the stops Illform a rigid abutment limiting the inward motion of the tool slides I88 and I8 I as the adiustable stops I84 and I88, positioned opposite thereto,-'impinge thereon, and'provision is made by which the stops I83 are brought successively into cooperative relation to the adjustable stop cam follower arm I98 which rests upon any of a series of segmental cam elements I98 (see Figures 7, 12 and 14) secured to the periphery of the work holder drum. Since this machine is intended to operate at high speed, these cam segments I88 are arranged of gradually tapering thickness so that the arm I88 is moved gradually from one to another of its positions, with the stops I83 in operative relation to one or another of the adjustable stops I84 and I88, during substantially the entire period of time of the indexing of the drum from one to a succeeding angular position. At the opposite end of the rock shaft I82 a bar I 88 similar to that shown in Figure 14 is employed for cooperation with stops I91 and I98 (see Figure 10) similar to the stops I84 to I88 for limiting inward motion of the tool carriers I82 and I83. With this arrangement there is no sudden motion of the parts necessary to adjust the cooperating stops for successive indexed positions.

Also because of. the high speed at which this machine is intended to operate, means are provided for cushioning the motions of the tool carriers I88 to I83, inclusive, in both directions. One of such means is illustrated in detail in Figure 16. The brackets such as I85 and I89, which carry the adjustable stop screws such as I84 or I88, are extended beyond the stop screws and through the extension is threaded a sleeve 288. Through this sleeve is slidable a rod 28I having a head 282 at its inner end, this head riding in a socket opening 283 which may be drilled into a fixed frame portion 284. The outer end of this socket is counterbored and threaded for the reception of the inner threaded end of a sleeve 285 provided with a inwardly to bring one of the adjustable abutment screws I88 against the abutment I83, the inner end of the sleeve 28, pressing against the ring 288 compresses the spring 283 between it and the head 282, thus efiecting a cushioning movement. As the tool slide moves outwardly the head of the sleeve 288 impinges on an adjustable abutment nut 2II threaded on the outer end of the rod 28I and held in an adjusted position by a lock nut 2I2 thereon, moving the rod 28I outwardly and causing the spring M8 to be compressed between the head 282 and the ring 289, which is held from outward movement as soon as it impinges against the in-turned outer end of the sleeve 288. This action cushions the last portion of the motion of the tool slide outwardly.

Such a mechanism is employed for each of the bers separatefrom the frame and secured thereto by suitable bolts so that by the mere removal of these top bearing members the shaft 228 with the mechanisms carried thereby can be lifted off from the machine without disturbing other parts. However, in .order to facilitate the changing of the cam set-ups for various tooling operations,

provision is made, in accordance'with this invention, for detachably securing'the drums to the shaft 228 so that it is unnecessary to removethe whole assembly of the drums and shaft in-order to change the tooling set-up, it beingonly necessary to change drums on which the cams for the different set-ups are arranged and which can be removably secured in position without removing the shaft 228 or any of the other parts of the machine. To this end, each of the cam drums 18 and I82 is formed in segmental sections, two such section's being ordinarily sumcient, which may be clamped in position on the shaft 228. For example, as shown in Figure '7, the cam drum I62 may be provided with hub portions 238 and 23I, each being formed with a portion integral with each segment of the drum. These hub portions are preferably set in from the end of the drum so that they do not increase the over-all length of the drum; Their outer faces are preferably.

tapered so as to cooperate with a mating taper on the inner face of the continuous clamping ring 233, 234 which maybe passed over the outer ends of the segmental hub portions and moved inwardly to hold these portions in assembled relation.-

The rings 233 and 234 may be forced inwardly toward the larger diameter portions of the hub portions, as by tightening bolts 235, which extend through the rings 233 and 234 and have threaded engagement withadjacent outwardly directed flange portions 236 of the drum. The shaft 228 is preferably provided with a keyway for a key 231 and one of the segmental portions of the drum is likewise provided with a mating keyway 238 so that when the segmental portions of the drum are clamped in position, they are also secured against rotation relative to the shaft 228. The cam drum I8 is likewise shown as made in segmental sections which are secured together by the clamping rings 248 similarly to the rings'233 and 234 for the drum I62. By providing a plurality of such segmental drums the cam arrangements for various machine set-ups may be applied to such drums. Thus, when desired, those previously on the machine may be readily removed by removing the clamping rings from the hub portions, whereupon the segments of other cam drums may be engaged about the shaft 228, the clamping rings placed over their hub portions and the drum segments thus clamped in position on the shaft 228. By mounting the shaft 228 on the outside of the machine, the clamping rings for the cam drums are freely accessible for removal or replacement of the cam drums.

The shaft 228 is arranged to be rotated at either of two selected speeds. Means for driving this shaft will now be described. Keyed to this shaft is a sleeve 258 (Figures '7 and 19) on which is secured a collar 25I. This collar carries, preferably integral therewith, a relatively thin housing member comprising a disk portion 252 provided at itsmargln with an annular flange 253. The open side of this housing portion is ar- 5 ranged to face a worm gear 254, which is keyed to a sleeve 255 mounted on a bushing 256 on the sleeve 250. The sleeve 255 is provided with a hub portion 2560 bearing against a hub portion 251 on the sleeve 250. This hub portion 251, as shown in Figure 5a, is provided with a slot 258, in which is secured as by screws 258, a block 260, which in turn has a slot 26l for the reception of an end portion of a shear pin 262. This shear pin 262 extends across into a similar block carried by the hub portion 256. Over one portion, as the hub portion 251, may be secured a segmental cap 265 (see Figure 5a) which holds the shear pin 262 in position. This shear pin couples the worm gear 254 in driving relation to the sleeve 250 but should abnormal resistance be encountered to the rotation of the shaft 220, this shear pin 262 will be sheared off between the hub portions 256 and 251 so that the worm gear 254 may turn without rotating the shaft 220. When this occurs a clapper 210 (Figure 19) fulcrumed on the pin 21I carried by the worm gear 254 is caused to be rotated around the collar 25!, which, as shown in this figure, is provided with angularly spaced cam projections 212 which are .30 contacted by a cam follower 213 on the clapper 210. This causes a striker portion 215, carried by a leaf spring 216 secured to the clapper 210, to strike successive blows on the flange 253 which acts as a bell to warn the operator that the shear pin has parted, so that he may stop the machine and replace the shear pin after correcting any abnormal conditions which caused the shearing of this pin.

This worm gear 254- is driven by a worm 280 keyed to a shaft 28! (Figures 'land 8) arranged transversely of the machine and suitably journaled in the top frame member 3. At one end this shaft 2 has secured thereto a bevel gear 282. This beveled gear 282 is arranged to be driven by a bevel gear 283 (see Figure 18) keyed to a sleeve 284 journaled on the shaft 42. It may be coupled for rotation from the shaft 42 by means of a friction ring clutch shown at 285, alternating rings of which are secured to an enlarged extension 286 of the sleeve 284. This clutch is controlled by the axial motion of a collar 281 slidably keyed to the shaft 42 and shifted by rocking a shift arm 288, which carries a shifterfork 288 having its ends engaged in a peripheral groove 280 in the shifter collar 281. When the shifter collar is moved to release the clutch 285, an arm 28l extended from the arm 288 and having an adjustable screw abutment 282, is turned to bring the abutment screw against the outer face of a braking arm 285, which is fulcrumed on the rock shaft 286 which carries the shifter arm 288, so that this braking member 285 presses against the outer face of the exten-- sion 285 and stops the rotation of the sleeve 284 85 and the rotation of the worm shaft 28L The rock shaft 286 has an actuating handle 281 on its outer end and is connected through a curved yoke 2860 with a rock shaft 286i in axial alinement with the shaft 286 and which carries an actuating handle 2810 on its forward end. The clutch 285 may thus be manually controlled from either the front or back of the machine. It may also be controlled automatically, the yoke 2860 carrying a follower 288 with which cooperates cams 2880 (Figure 7) on a cam drum 288 also keyed to the cam shaft 220; This mechanism constitutesthe high speed drive for the shaft 28L The low speed drive of the shaft 2" is derived from the shaft 30 by which the work holders 6 are rotated as previously described. The gear 35 on this shaft 30 is connected to a similar gear 300 carried by a shaft 30l (see Figure 8) by a link belt 302. This shaft 30! carries a gear 303 which meshes with a gear 304 keyed to a shaft 305. The shaft 305 has keyed thereto a'worm 306 which meshes with a worm gear 301 journaled on the shaft 28| and coupledto an overrunning clutch shown as a roller clutch at 388. The overrunning clutch may be clutched to the shaft 28l by a clutch collar 308 slidably keyed to the shaft 28L When the high speed drive from the sleeve 284 is stopped by the opening of the clutch 285, and the collar 308 is in clutching position, the shaft 28l is driven through the overrunning clutch 308 at a low speed from the train of gearing and the link belt drives previously described from the same primary drive shaft 42. The link belts 31 and 302 may be held in proper operative tension by the belt tightener shoes 3l0 and 3 shown in Figure 8. The shoe 3l0 is shown as formed integral with a rock arm 3l1,fulcrumed at 3 l2 and having its opposite end provided with a threaded engagement with a tightening shaft 3'3 extending out through one side of the frame portion 3 where it may be accessible for adjustment. The shoe 3| I is pivotally mounted on one arm of a bell crank lever M5, the opposite arm of which is likewise provided with a suitable threaded engagement with an adjusting rod M6, the outer end of which is accessible from the outside of the frame 4 on the opposite side of the machine. The clutch collar 308 may be moved along the shaft 28I into and out of clutching engagement with the overrunning clutch 308. As shown this may be done by hand, the collar 308 being provided with a peripheral groove 3l8 in which rides the end portion of an arm 3l8 suitably secured to a. vertical rock shaft 3l20. This rock shaft extends above-the housing 3130 which encloses the overrunning clutch and the clutchcollar 308, and has fixed at its upper end a hand lever 3|50 (Figures 5 and 8) by which it may be rocked.

Means may be provided for turning the cam drum shaft 220 by hand so as to facilitate making adjustments and the like, and means are provided for this purpose actuable from both the back and front of the machine. 0n the splined forward extremity of the shaft 28! is keyed a hand wheel 3|6 for this purpose. At the back of the machine and in axial alinement with the shaft 28l is a shaft 320. The forward end of this shaft has keyed thereto a pinion 32l (see Figure 8) which meshes with the gear 283 on the shaft 42 with which also meshes the gear 282 on the shaft 28!. Outwardly of the machine frame the shaft 320 has keyed thereto the hub 324 of a hand wheel 325 (see Figures 5'and 8). Turning of this hand wheel 325, therefore, acts to rotate the shaft 2 and to turn the cam shaft 220.

Work holder control and actuation Besides controlling the motions of the tool slides and the slow and fast speed drives for the shaft 220, this shaft also carries means for indexing the work-holding turret, for locking this feed of the stock when a new cycle of machining operations is to be performed is determined, and for opening and closing the work holders and for feeding the stock.

I The turret or work holder drum-locking mechanism is shown best in Figures 7 and 12. Re

ierring to these figures, it will be noted that the drum or turret which carries'the work holders is provided with sockets 350, each of which may receive at suitable times the lower end of a locking pin I. This locking pin is mounted slidingly in guide members 352 and is normally pressed downwardly toward the work holdercarrying drum as by means of a pair of springs 353. These springs react between adjustable washers 354 held on the upper ends of guide rods 355 over which the springs are positioned by nuts 356 threaded on the upper ends of the rods. The lower ends of these rods 355 are secured in the guide-members 352, and the lower ends of the springs 353 bear on a cross member 351 secured to the upper end of the locking pin 35l. This cross member 351 has suitable holes therein through which the rods 355 extend. The lock-' ing pin 35! is provided with a recess 360 within which is engaged one arm of a lever 36! (Figure '7) fulcrumed at 362 between the guide members 352. The opposite end of this lever 36! may be depressed when the work holderecarrying drum is to be indexed by an edge cam 363 secured to the cam shaft 220. In order that this.

work-holding drum may be released manually a second cam 364 is journaled on the shaft 220 and is provided with a handle 365 by which it may be turned, both these cams being in position to act upon the end of the lever 36l, which is preferably provided with a cam follower collar 366 journaled thereon to avoid unnecessary friction. The weight of the handle 365 normally holds the cam 364 in inoperative angular position. Adjacent to the cams 363 and 364 the cam shaft 220 is provided with a cam 368 for actuating the stock stop and which may act on a cam follower 310 on an arm 31! fulcrumed at 312 (Figure 10). The lower end of the arm 3" is connected through a link 314 pivoted thereto to an arm 315 keyed to a rock shaft 316. This rock shaft is threaded for axial adjustment thereon of the stock stop arm 380, which carries a stop element 38l, against which the stock being fed through the work holder at the fourth station may impinge when it is fed forwardly. This stop stock arm is rocked into position just before a feeding action of the stock and is then retracted out of the way into the position shown in Figure 10, so that the tools may be in position to act on the work,

The stock-gripping means for the stock holders are shown as actuated by cams 400 on the cam drum I62. These cams act on a follower roll 40l (see Figure 7) carried bya slide 402 mounted to move substantially parallel to the axis of the work-carrying drum. To this slide 402 is connected a block 403 which has lateral extensions 404 (see Figure 13) against which engage springs 405 surrounding a pair of rods 406. These springs normally urge the slide 402 to the right as seen in Figure 7 so that 8. depending lug 4l0 thereon is positioned for successive engagement between a pair of spaced lugs 4H and M2 on a plurality of slides 4i 3. Each slide 4:3 is mounted for movement axially of a bar secured between' the wall members II and I3 of the work-carrying drum adjacent to one of the work holders. Each member "3 is provided with an arcuate lug portion 420 which rides within a peripheral groove 425 in a spool member 426 movably axially of each work holder 6. This spool member engages between the locking fingers 421 and when is moved forward into contact with the stock shop. This actuation of the stock feed is produced by cams 430 on the drum I62 which act on a cam follower 43l (see Figure 5) on -a rockable follower arm 432. This rocking motion is transmitted througha rock arm 433 to a bar 434, which is slidable through an opening in the lug 435 secured to a feed block member 436. This feed member is carried on the end of a bar 431 (see Figure 4) which is slidably guided in the machine frame substantially parallel to the axis of the work holder-carrying drum. The outer end portion of the bar 434 is threaded, and between the lug 435 and nuts 438 threaded on its outer end is positioned a spring 439, through which pressure is exerted to move the block 436 in feeding direction when the cams 430 move the follower 43L in feeding direction. A pair of nuts 440 threaded on bar 434 to the right of the lug 435 form an abutment which may 'strike positively against the lug 435 when the bar 434 is moved to the left to produce the retractive motion of the block 436. a

As shown best in Figure l, the arm 433 is provided with a plurality of posts 445 any of which a member 446 attached to the right hand end of the bar 434 may be engaged at will in order to providea ready adjustment of the throw of the bar 434 for any desired angular extent of rocking Of the arm 433. I The block 436 is provided with an extension 450 on which is fulcrumed at 45l a bell crank lever 452. One arm of this bell crank lever 453 is formed as a shaft on which is journaled a tapered roller 454 provided with a peripheral groove 455 which may be engaged over a circular head 456 of any one of the work holder feed members 451 which may be presented thereto as the work-holding drum is indexed, so that on movement to the right of the block 436 that one of the work holders which is in the No. 4 station may have its work feed element 451 actuated-at the proper time to feed the stock therein. The other arm 460 of the bell crank lever 452 has passed therethrough a rod 46l, which is secured to the outer end of the bar 431, and between it and a nut 462 threaded on the outer end of the rod 46I, is positioned a coil spring 463. This coil spring normally urges the arm 460 against the outer end of a knurled hand wheel 464 also threaded on the rod 46! and actuable by turning to retract the arm 460 and rock the roller 454 out of engagement with the feeding head 456. When this is done this feeding head may be engaged and pulled outwardly, permitting a fresh piece of stock to be inserted in the work holder. When this has been done, the stock feeder is again placed in position and the hand wheel 464 screwed inwardly, whereupon the head 456 may be pushed to the right, engaging of the high speed of operation of this machine, the block 434, as shown in Figure 4, may be provided with a socket 410 within which may ride'a piston 4" having a reduced extremity 412 secured as byithreading into a. frame portion 413. This isten 4' fits sufliciently loosely into the socket 410 to act therewith as a dash' pot, cushicining the movements of the block 456 and thus the feeding action on the stock. I

In order to'prevent the stock from being retracted during cutting operations thereon, as by those tools which are movable axially of the work, means may be provided for holding the work holders closed against the work at any desired of the several stations. Mechanism for doing this is shown best in Figures 13 and 17 and comprises an arcuate plate 414 having an armate rib 415 provided at its forward end with a tapering face 416. This plate 414 is secured as by bolts 4" to the bearing portion l in position to engage the right hand face of the spool 425 of each work holder when it is in those stations where holding of the work securely is desirable. This prevents any untoward motion of the spool 42. in a direction to release the stock.

Indexing of the work-carrying drum to bring the several work holders successively into each operative station is also accomplished from the shaft 22.. To this end it is shown as having secured thereto near the left hand end of the ma.- chine a gear 4" (see Figures 2 and 7). This gear meshes through an intermediate gear I with a gear 452. Turnable with the gear 482 is an indexing arm 4 having a follower roll 484 which may pass between guide flanges 485 of a Geneva motion wheel which may be integral with or secured to the end wall H oi the work carrier drum.

Stock reel In order that the stock extending to the various work holders may be supported and manipulated in the rapid manner desirable in a high speed machine, provision is made, in accordance with the present invention, to support this stock spaced back from the work holders in the drum and to turn this support as the drum is indexed and likewise to rotate the holders for such stock. This materially decreases the noise and wear both on the stock and on its carrying parts and facilitates the rapid handling of the stock. To these ends apair of standards such as 500 and 5M for the stock may be provided as shown in Figures 1, 5 and 6. The standard nearest to the stock-holding drum may, if desired, be formed integral with the base of the machine, the standard ill being so shown in Figure 1. The standard Ill is shown as having a circular opening in which is journaled substantially coaxially with the work-carrying drum, and as shown best in Figure 6, a disk member 502. This disk member, as shown, consists of a casing comprising a main portion SI! and a somewhat domed cover member 504 which are suitably secured together. The cover member 504 is connected to the end of the work-carrying drum, and as shown best in Figure 6, to the end wall member H thereof, by a tube 5". At one end this tube engages about a circular flange 5 on the cover 504 and at the other end about a tubular flange 5l2 of a collar III secured to the wall member II as by the studs 5. Thus as the work-carrying drum is indexed, the disk member 502 is also indexed correspondingly. The standard 50] has Journaled therein a disk member 520 coaxially with the disk member 502 in the standard "ii.

In this member 502 and in the disk member 520 are bearings Hi and 522, respectively, arranged in circular series about the axis of rotation of these disk members, and journaled therein are the stock-receiving tubes 525 through which the stock'ireelypasses. Centrally the disk members 520 and 502 are connected for simultaneous indexing motion as by a tube connector 524. Between the disk member 503 and the casing closure 504, the tubes 525 have keyed thereto gears 528 which mesh with a central gear 521 on a shaft 528 journaled in a central bearing 529 in the disk member 502. This shaft 528 is also journaled in a bearing 5" in the collar H3, and an ex-' tension 53! of this shaft passes into the work holder-carrying drum and at its inner end is coupled as by the coupling 532 (see Figure 7) to the shaft 25 to be driven therefrom. Thus, as the work holders in the drum are rotated, so also are the stock-carrying tubes 525 and as the workcarrying drum is indexed, so also are these supporting tubes indexed from one to a succeeding angular position.

From the foregoing description of an embodiment of this invention, it should be evident to those skilled in the art that various changes and modifications may be made without departing from the spirit or scope of this invention as defined by the appended claims.

I claim:

1. A machine of the class described, comprising a bed, a drum rotatable about its axis-and carried by said bed, a plurality of holders arranged in circular series in said drum, a holder movable toward and from a drum-carried holder in one angular position thereof, means for indexing said drum to bring its holders successively into said angular position, stops limiting the approach 01. said movable holder toward a drum holder to limit the approach of a tool carried by one of said holders to work carried by the other holder, and means operative to move said stops to present a selected stop into operative position for each indexed position of said turret, said stop presenting means including cams carried by said drum and extending substantially continuously from one to another of said drum carried holders, and a follower engaging said cam and controlling said stops, said cam being shaped to cause motion of said follower to change from one to a succeeding stop to take place during substantially the entire indexing movement of said drum.

2. A machine of the class described, comprising a bed, a drum rotatable about its axis and carried by said bed, a plurality of holders arranged in circular series in said drum, a holder movable toward and from a drum-carried holder in one angular position thereof, means for indexing said drum to bring its holders successively into said angular position, stops limiting the'approach of said movable holder toward a drum holder to limit the approach of a tool carried by one of said holders to work carried by the other holder, means operative during substantially the entire indexing movement of said drum moving said stops to present a selected stop into operative position for each indexed position of said turret, and means for cushioning the movement of said movable holder as it approaches said stopped position as determined by any of said stops.

3. A machine of the class described, comprising a bed, a drum rotatable about its axis and carried by said bed, a plurality of holders arranged in circular series in said drum, a holder movable toward and from a drum-carried holder in one angular position of the latter holder, means for indexing said drum to bring its holders successively into said one angular position, a stop for said movable holder for each of said drum holders, a movable member having a stop cooperating successively with the other of said stops to limit the motion of said movable holder at each indexed position of said drum, cam means carried by said drum and extending substantially continuously from one to another of said drumcarried holders, a' rock shaft, a cam follower arm carrled by said shaft in operative engagement with said cam means to rock said shaft from one to a different angular position during substantially the entire period of each indexing movement, and operative connections between said rock shaft and member causing the stop carried by said member to be moved from cooperative relation to one of the other of said stops to another of said other stops as said drum is being indexed.

4. In combination, a rotary drum, a plurality of work holders for bar stock arranged in circular series in said drum, means for indexing said drum, a tool carrier movable substantially parallel to the axis of said driim, work-gripping means for each work holder, an actuating element for each gripping means movable axially of its respective holder to grip or release the work, means acting on said element when its work is in position to be operated upon by a tool on said carrier to hold said element in work-gripping position and thereby insure against slipping of the stock under the thrust exerted thereon by said tool, and means with which each of said elements engages when its respective holder is in a different indexed position actuable to release and then grip the stock.

5. In combination, a rotary drum, a plurality of rotary work holders for bar stock arranged in circular series in said drum, means for indexing said drum, work gripping means for each work holder rotatable therewith, an actuating element for each work gripping means carried by said drum and non-rotatablewith its gripping means but movable axially of its holder, means, oo-

operating with each -of'said elements at certain ones of the indexed positions of the corresponding work holder to hold said element against axial motion from its work-gripping position, and means cooperating with said element in another indexed position of the corresponding work holder to move said element axially to work-releasing position.

'6. In combination, a rotary drum, a plurality of rotary work holders for bar stock arranged in circular series in said drum, means for indexing said drum, work gripping means for each work holder rotatable therewith, an actuating elementfor each work gripping means carried by said drum and non-rotatable with its gripping means but movable axially of its holder, means cooperating with each of said elements at certain ones of the indexed positions of the corresponding work holder to hold said element against axial motion from its work-gripping position, and means cooperating with said element in another indexed position of the corresponding work holder to move said element axially to workreleasing position and then to return it to workgripping position.

'7. In combination, a rotary drum, a plurality of rotary work holders for bar stock arranged in circular series in said drum, means for indexing said drum, means for rotating said work holders,

work-gripping means for each holder, an element rotatable with each holder and movable axially thereof for actuating said gripping means to grip and release the work, a member non-rotatable with each holder and movably carried by said drum operatively connected to each of said elements, means movable adjacent to one station of said holders and with which said members successively cooperate as said drum is indexed for releasing and then gripping the work at said station, a tool carrier movable substantially parallel to the work holder in another of said stations, and a stationary element with which each of said members cooperates at said other station to hold said member in work-gripping position to prevent backward motion of the work due to the thrust thereon or a tool on said carrier.

8. In combination, a rotary work holder, a stock feeder rotatable with said holder and movable axially thereof to feed the stock, a member movable substantially parallel to said work holder axis, a lever fulcrumed on said member and having an arm normally in operative engagement with said feeder, means for moving said feeder, a threaded rod extending from said member, a hand wheel threaded on said rod and with which said lever may engage, and a spring pressing said lever against said rod.

9. In combination, a rotary work holder, a '3 stock feeder rotatable with said holder and movable axially thereof to feed the stock, a member movable substantiallyparallel to said work holder axis, a lever fulcrumed on said member and having an arm normally in operative engagement with said feeder, means for moving said feeder, a threaded rod extending from said member, a hand wheel threaded on said rod and with which said lever may engage, and a spring pressing said lever against said rod, said spring being arranged to press said lever toward operative angular position.

10. In combination, a plurality of rotary work holders for bar stock, a stock support spaced from said holders, a rotary stock carrier for each holder on said support and through which the stock may freely extend, and means for efiecting simultaneous rotation of said work holders and stock supports.

11. In combination, a rotary work holder for bar stock, a stock support spaced back from said holder, a rotary stock carrier carried by said support and through which the stock may freely extend, and means for' simultaneously rotating said holder and carrier to rotate stock held by said holder and extending into said carrier.

12. In combination, a rotary work holder for bar stock, a stock support spaced back from said holder, a rotary stock carrier carried by said support and through which the stock may freely extend, a rotary shaft, driving connections from said shaftto said holder and to said carrier, and means for rotating said shaft.

13. In combination, a plurality of rotatable work holders for bar stock arranged in circular series, a stock support spaced back from said holders, a plurality of rotary stock carriers carried by said support in circular series corresponding to said work holders and through which the stock may freely extend, and means for simultaneously rotating each holder and its respective carrier.

14. In combination, a plurality of rotatable work holders for bar stock arranged in circular series, a stock support spaced back from said holders, a plurality of rotary stock carriers carried by said support in circular series corresponding to said work holders and through which the stock may freely extend, a rotary shaft extending coaxially of said series of holders and carriers, driving connections from said shaft to said holders and carriers, and means for rotating said shaft.

15. In combination, a rotary drum, a plurality of rotary work holders for bar stock arranged in substantially parallel relation in said drum, means for turning said drum, a' stock support spaced from said drum, a member rotatable substantially coaxially with said drum and carriedby said support, rotary stock carriers carried by said member for supporting stock extending to said drum work holders, connections between said drum and member causing simultaneous turning; motions thereof, and means actuable to rotate said work holders and stock carriers.

16. In combination, a rotary drum, a plurality of rotary work holders for bar stock carried by said drum and arranged in circular series about the axis of rotation of said drum, means for turning said drum, a plurality of standards spaced from each other and from said drum, a member rotatably carried by each standard substantially saiddrum and arranged in circular series about the axis of rotation of said drum, means for turning said drum, a rotary shaft arranged coaxially of said drum, means for rotating said shaft, driving connections from said shaft for rotating said work holders, a pair of standards spaced apart and from said drum, a member rotatably carried by each standard substantially coaxlally with said drum, a plurality of tubes extending between and rotatably carried by said members substantially coaxially with said work holders and forming supports for bar stock extending to said work holders, means connecting one of said members to said drum to be turned thereby, a rotary shaft extending from said one member toward said drum, rotary driving connections between said last mentioned shaft and said tubes, and means coupling said shafts for simultaneous rotation.

18. In combination, work-holding mechanism, tool-holding mechanism, and means for moving said mechanisms relatively, said means comprising a rotary shaft, a cam drum secured to said shaft in an accessible position and cams carried by said drum, said cam drum being formed in sections, and means accessible while said shaft and drum are in normal operative positions for releasably securing said drum sections together and to said shaft, whereby said drum may be removed and another drum substituted therefor without removing said shaft from its normal position.

19. In combination, a bed, a frame extending along and above said bed, a rotary drum positioned between said bed and frame, a plurality of work holders arranged in circular series in said drum about its axis of rotation, tool holders 10- cated between said bed and frame and movable toward and from work carried by said work holders, a rotary shaft Journaled in said frame, means said shaft is in normal position for releasably securing the segments of said cam-carrying drum together and to said shaft.

20. In a machine of the class, described, workholding mechanism, tool-holding mechanism, means for moving said mechanisms relatively, meansincluding a rotary shaft journaled on the outside of the machine, and a cam-carrying drum secured to said shaft for actuating said moving means, said drum being formed of segmental sections, each section having a segmental hub portion engageable with said shaft, and a ring engageable about said hub portions of the several sections for holding said sections about and secured to said shaft.

21. In a machine of the class described, workholding mechanism, tool-holding mechanism, means for moving said mechanisms relatively, means including a'rotary shaft journaled on the outside of the machine, and a cam-carrying drum secured to said shaft for actuating said moving means, salddrum being formed of segmental sections, each section having a segmental hub portion engageable with said shaft, the outer faces of said hub portion being longitudinally tapered, a ring having a matingly tapered inner face engageable about said hub portions to hold said sections in assembled relation, and means for drawing said ring toward the larger diameter portions of said hub to exert clamping pressure thereon.

22. In combination, a plurality of relatively movable devices, a rotary shaft, mechanism actuated by said shaft for relatively moving said devices, a member fixed to said shaft, a member joumaled on said shaft, a shear pin connecting said members, means for rotating said journaled member, a shell element fixed to one of said members, a cam element carried by the other of said members, and a clapper aetuable on relative motion of said members to beat upon said shell and thereby signal upon the shearing of said pin.

24. In combination, a bed, a frame positioned above said bed, a pair of superposed slides between said frame and said bed, an upright shaft, a rock member journaled on said shaft and having a pair of arms, connections from one of said arms to the upper of said slides, an arm fixed to said shaft above said member, an arm fixed to said shaft below said member, connections from said last-mentionedarm to the lower of said slides, a rotary shaft, and cam mechanism actuated by said shaft and engaging the other arm of said member and the other arm fixed to said upright shaft.

FRANK L. CONE.

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