US2114177A - Multiple spindle automatic lathe - Google Patents

Description

April 1938. F. L. CONE MULTIPLE SPINDLE AUTOMATIC LATHE Filed April 5, 1936 10 Sheets-Sheet 1 April 12, 1938. F. L. CONE MULTIPLE SPINDLE AUTOMATIC LATHE Filed April 5, 1936 10 Sheets-Sheet 2 1 l I l 2% 4H Lymg Jaw April 12, 1938. F. L. CONE MULTIPLE SPINDLE AUTOMATIC LATHE Filed April 3, 1936 10 Sheets-Sheet 3 Apt-ER 12, 1938. F. L. CONE MULTIPLE SPINDLE AUTOMATIC LATHE l0 Sheets-Sheet 4 Filed April 3, 1936 April 12, 1938.

F. L. CONE MULTIPLE SPINDLE AUTOMATIC LATHE Filed Aprils, 1936 10 Sheets-Sheet 5 Aprifi 12 1938. F, CONE MULTIPLE SPINDLE AUTOMATIC LATHE Filed April 3, 1956 10 Sheets-Sheet 6 A ril 12, 1938. L, C NE 2,114,177

MULTIPLE SPINDLE AUTOMATIC LATHE April 1938. F. CONE MULTIPLE SPINDLE AUTOMATIC LATHE 10 Sheets-Shet 8 Filed April 5, 1956 a IIIII Ill April 12, 1938. QQNE 2,114,177

MULTIPLE SPINDLE AUTOMATIC LATHE Filed April 3, 1936 10 Sheets-Sheet 9 April 12, 1938. L, CONE MULTIPLE SPINDLE AUTOMATIC LATHE l0 Sheets-Sheet 10 Filed April 3, 1 936 .viii iiiih III Patented Apr. 12, 1938 UNITED STATES PATENT OFFICE MULTIPLE SPINDLE AUTOMATIC LATHE Cone, deceased Application April 3, 1936, Serial No. 72,514

25 Claims.

This invention relates to automatic lathes of the multiple spindle type and has for an object to provide a machine of this type in which the work is presented for the tooling operations at 5 one end of the machine, which may be regarded as its front, the work and the tools being then readily accessible to the operator, the various controls being positioned convenient to the operators station at this front end of the machine.

10 The invention further relates to advantageous arrangements and details which will be hereinafter more specifically described. For more complete understanding of this invention, reference may be had to the accompanying drawings in which Figures 1 and 2 are opposite side elevations of a machine embodying the invention.

Figure 3 is a top plan view of the same.

Figures 4 and 5 are rear and front end elevations, respectively, of the machine.

Figure 6 is a fragmentary longitudinal section through the machine on lines 6-6 of Figure 4.

Figures 7 to 10 inclusive are detailed crosssectional views on the correspondingly numbered sectional lines of Figure 1, several of these figures being drawn to a larger scale.

Figures 11 and 12 are detailed sections on the correspondingly numbered sectional lines of Figure 9.

Figure 13 is a detailed section on line I 3--l3 of Figures 11 and 12.

Figures 14 and 16 are detailed sections on lines 14-14 and l6l6 respectively of Figure 1.

Figure 15 is a detailed plan of a portion of the machine shown in Figure 3, but to a larger scale and showing certain of the parts in dotted lines.

Referring first to Figures 1, 2, and 3, the machine, as shown, comprises a base or bed I having spaced upright frame portions 2 and 3 joined together at their upper ends by longitudinally extending frame part 4. The frame part 2, as shown best in Figures 6 and 7, is provided with a circular opening in which is journaled a work-carrying turret 6. This turret, as shown, carries five rotary work spindles l therein arranged in circular array about the central axis of the turret, though it is to be understood that the particular number of spindles is not material to this invention and more or less than five may be employed if desired. A shaft 8 extends axially through and is secured to the turret 6, the forward extension of the shaft serving for a purpose which will later be described. The rearward extension of the shaft 8 is keyed within a disc 9 journaled within a bearing forming a part of the frame member 3. In machines of this general type, as heretofore constructed, the various tools have been arranged to operate between the spaced frame parts 2 and 3. In the present machine, however, the tools are arranged to operate outwardly of the frame portion 2 and at what may be termed the forward end of the machine. The work being operated upon and extending forwardly of the work spindle is thus unobstructed except for the tool slide and the parts carried thereby, there being no frame parts or control mechanism, either of the spindles or tools, in front of the work. The various automatic controls of the machine are arranged to be carried above the turret and, as shown, are supported by the frame member 4. This control mechanism comprises a cam shaft I0 carrying various cam drums, such as those numbered from II to H, the purposes of which will later appear.

Machine drive mechanism As shown, the machine is driven by a single motor 20, which is shown supported on a platform 38 arranged above the rear frame member 3. If desired, of course, the machine might be driven from any other suitable source. The motor 20 is connected, through a silent chain passing over a pulley 2| thereon, to a main drive pulley 22. This drive pulley 22, as shown best in Figures 14 and 15, is fixed to a main drive shaft 23 arrayed longitudinally of the machine and extends into a gear box 24. Within the gear box 24 the shaft 23 has keyed thereto one member 25 of a cone friction clutch. The other member 26 of this clutch is journaled on a sleeve 2! on the shaft 23 and is secured in driving relation to a bevel gear 28 also journaled on the sleeve 21. This bevel gear 28 meshes with a similar gear 29 journaled on a sleeve 30 carried by a stationary shaft 3|. tegral with the gear 29 is a pinion 32. As will later be described, this pinion 32 forms a portion of the high speed drive for the cam shaft 19.

The low or working speed of this cam shaft is taken from the shaft 23 and in alignment with which is secured a shaft 35 which extends through a gear box 34. Forwardly of the gear casing 34, it carries one of a pair of change gears 36 and 31. The gear 31 of this pair of gear is fixed to a shaft 49 arranged parallel to the shaft 35 and which extends back through the box 34 and into the gear box 24. It has secured thereto within the gear box 24 a worm 39. This worm 39 meshes with a worm Wheel 41! (see Figures 15 and 16) which is journaled on a Fixed to or in.

shaft 4| extending across the machine at right angles to the shafts 23, 35, and 36. Interposed betweena sleeve 42 loose on the shaft 4| and the worm wheel 40 is an overrunning clutch shown as of the roller type at 43, whereby in the normal direction of the worm 4|] the sleeve 42 may be driven faster than the worm wheel 49. Should the sleeve 42 tend to be rotating at less speed than the Worm wheel 40 the worm wheel 46 immediately takes charge of its rotation and drives the sleeve 42. The sleeve 42 may be coupled for rotation with the shaft 4| by the sliding clutch collar 44 splined to the shaft 4| and having clutch teeth cooperating with making clutch teeth in the adjacent end of the sleeve 42. This shaft 4| on the opposite side of the machine from the gear casing 24 carries one of a pair of change gears 45 and 46, the other of the pair being carried by a shaft 4? arranged parallel to the shaft 4| and carrying within the gear box 24 a gear 48 which is in mesh with the gear 32 of the high speed drive. The shaft 41 carries a worm 50 which meshes with a worm wheel 5| connected through the shear pin 52 with the cam shaft Ill. When the sleeve 42 is clutched to the shaft 4| and the friction clutch 25-26 is open, the shaft 41 and the cam shaft I!) are driven at the lower or working speed, but if the friction clutch is closed, the sleeve 42 remaining clutched to the shaft 4|, the shaft 4? and the cam shaft I are driven through the gears 32 and 48 at the higher or idle speed, the shaft 4| and the sleeve 42 overrunning the worm wheel 49. Control of the high and low speed clutches may be effected by hand from the operators station, and the control of the friction clutch 25-26 so the change between the high and low speeds may be effected automatioally. This control is arranged as follows:

The clutch collar 44 is provided with an annular groove 55 within which rides a lug B of a block 5'! mounted for sliding movement in the direction of the axis of the shaft 4| on a pin 58. Remote from the lug 56 this block 51 is provided with. a. recess 59 in which engages one end of a lever arm fill which, as shown best in Figure 15, may be fulcrumed to a portion of the machine frame as at 6|. Pivoted tothe lever arm. 6!], as on the pin 52, is the forked extremity 63 of an arm 64. The opposite extremity of this arm 64 is fulcrumed on a disc member 65 eccentrically disposed with relation to a vertical shaft 66 which carries it. As shown best in Figure 10, this shaft is journaled in a bracket 61 secured to the inner face of the gear box 24. To the upper end of the shaft 6% is secured a crank arm 68 to which is pivoted the rear end of an actuating rod Ill. This rod Hi, as shown best in Figures 1 and 3, extends along the right hand side of the machine through a suitable guide II which may be carried on the gear box 34, and its forward end is turned laterally to form a handle I3 which be grasped by the operator. By pushing inwardly on the handle I3, the clutch collar 44 is thrown into clutching engagement so as to start the machine in operation. By pulling forwardly on the handle 73, the clutch collar 44 is thrown out of engagement so that the drive of the machine is stopped so long as the friction clutch members 25 and 26 are out of engagement. The friction clutch 2526 is actuated by the sliding axially of the shaft 23 of a cam collar 80. This cam collar is provided with a cam-face portion 8| with which cooperate a plurality of fingers 82.

vEach of these fingers is fulcrumed, as at 83, in

a slot in the clutch element 25 and has one end portion, as 84, bearing against the cam portion 8| of the collar and an end portion 85 which may bear against the end of a sleeve 86 through which the shaft 23 passes. On motion of the clutch collar 80 to the right into the position shown in Figure 14, the cam portion 8| rides. inwardly of the ends 84 of the levers 82 causing the clutch element 25 to be forced into clutching relation with the element 26, the ends 85 of the levers B2 pushing on the end of the sleeve 86. On movement of the clutch collar 80 to the left from the position shown in Figure 14, the cam portion 8| rides out from between the levers 82, whereupon releasing springs, such as 90, seated in sockets in the element 25 and reacting against headed release pins 9| which bear against a wear plate 92, force the clutch element 25 to the left out of friction engagement with the clutch element 26. The clutch collar 80 is given this motion by the axial motion of a shifter finger 95 engaging in an annular groove 96 in the clutch collar (see Figure 15) and carried by a longitudinally slidable rod 91 which extends out from the gear box 24. To the other end of the bar 9'! is secured a block M2 to which is pivotally connected one end of a link 98, the other end of which is pivoted, as at 99, to a crank arm I00. This crank arm I00 is secured to a rock shaft IOI which extends across the machine and carries affixed to its opposite end a crank arm H32 (see Figures 2 and The crank arm I02, as shown best in Figure 2, has pivoted to its upper end a link E03, the rear end of which is pivoted to a rock arm I04. At the pivotal connection I05, between the link I03 and the rock arm I04, is a cam follower I06 (see Figure 3) which may be actuated at suitable times by cams (not shown) on the cam drum II. This provides for the automatic change between high and low speed. The manually controlled change is effected by moving axially an actuating rod III), the forward end of which is bent angularly, as at III, to form a handle, and the rear end of which is secured. in the block ||2 to which the rod 91 is also secured. By pushing inwardly or backwardly on the handle I I, the friction clutch is brought into clutching relation to produce the high speed drive of the machine, and on pulling outwardly or forwardly this friction clutch is unclutched.

In order to prevent any overrunning of the cam drum and associated parts, when the high speed friction clutch is thrown out, means: are provided for automatically braking the rotation of the shaft 45 during the low speed drive. For this purpose, the end of the shaft 41 within the gear casing 24 has secured thereto a brake drum II5 which is surrounded by a brake band IIB. This brake band may be held against rotation with the drum as by means of a screw plug III (see Figure threaded through a wall of the gear box 24 and having a pin extremity II8 engaging in a suitable socket in the brake drum casing H9. This brake drum casing is split, the split ends having ears, such as I20, into which are threaded the actuating shaft |2I by the turning of which the ears may be brought together to apply the brake or separate them to release the brake. The upper end of this threaded shaft |2| has secured thereto an arm I22 (see Figures 3 and 15) which is connected through a pivoted link I23 to a bracket portion |24 secured to the rod H0. A pair of check nuts I25 on the forward end of the link I23 may be used to adjust the angular position of the threaded shaft |2| so as to adjust the tightness of the brake band on the brake drum.

The rotation of the Work spindles is also effected by rotation of the main drive shaft 23, the connections being taken to the spindles from the shaft 49. Referring to Figure 14, this shaft 49 is shown as provided with two pairs of sprocket gears I39 and I3I about which pass duplex roller chains which pass over similarly spaced sprocket wheels H2 and I33 (see Figures 6 and '7) on the several work spindles I. Between the pairs of sprocket wheels I33 and I32 each of these spindles carries a single sprocket wheel I34, and about all of these sprocket wheels I34 is arranged a roller chain I35 (see Figure 7). This roller chain I35 holds all of the work spindles in such definite angular positions relative to each other that as the duplex sprocket wheels I 32 and I33 of any one of these spindlespasses out of contact with one side of the duplex chains between the stretches I36 and I31, as shown in Figure 7, these duplex sprocket wheels are held in proper angular position so that they will properly cooperate with that stretch of the duplex chains which they approach in each indexing motion of the turret. A pair of duplex sprocket wheels at I38 bear against the outer side of the stretch I36 of the duplex chains to hold them in proper relationship to the duplex sprocket wheels of the spindles, and similar duplex sprocket wheels I 39, secured to a shaft I40 mounted on an arm I4I, are employed to hold the duplex chains in proper tightened position, the arm I4I being spring pressed to the position shown in Figure '7 as by the spring I42 carried by a link I43 pivoted at its lower end to the arm I4I This spring M2 bears at its; upper end against a collar I44 adjustable from and toward a bracket through which the upper end of the link I43 is slidable.

Means are also provided by which the cam shaft Ill may be turned by hand in order to facilitate adjustment and initial setting up of the machine. For this purpose, the transverse shaft 4I, shown best in Figure 16, has secured thereto a bevel gear I56 with which meshes a bevel pinion I5! affixed to a shaft I52. This shaft I52 extends toward the front end of the machine and enters a small gear casing I53 (see Figures 2 and 16). Within this casing I53, a gear I54 is secured to the shaft I52, and with this gear I54 meshes a similar gear I55 which is journaled on a sleeve E56. The inner face of the gear I55 is formed with slots, as at I51, into which may be pushed mating spaced ribs I58 on the inner end of a shaft I55. The rear end of the shaft I59 beyond the ribs I58 is of reduced diameter and passes within the sleeve I56. By pressing inwardly axially on the shaft I59, it may be moved relative to the pinion I55 so as to bring the ribs I58 into the slots I51 so as to couple the shaft I59 to the gear I55, whereupon rotation of the shaft I59 will rotate the gear I55. Rotation of this gear i55 will, through its train of connections, rotate the shaft 4i and thus cause rotation of the cam shaft through the gears 45 and 46 and the power feed worm shaft 41. When both clutches 25-26 and 44 are disconnected, the cam shaft may be rotated without rotation of the work spindles. The shaft I59 is limited in its forward motion, where it is out of operative connection with the gear I55, by means of a washer I60 overlapping the end of the sleeve I56 and a bushing I 6| surrounding the sleeve I56, this washer being held in position as by a nut I32 threaded on the still further reduced extremity of the shaft I59. This shaft I59 extends to the forward end of the machine where it has secured thereto a hand wheel I65 by which it may be turned by the operator who faces the forward end of the machine. In the normal inoperative position of the hand wheel its shaft I59 is out of operative connection with the driving mechanism so that it is not rotated when the machine is in operation, but whenever it is desired to turn the machine over by hand it is only necessary to press the hand Wheel I 65 inwardly, whereupon it is moved into driving engagement with the gear I55 'so that rotation of it thereafter will serve to turn the machine over.

Turret indexing, locking and clamping mechanism The indexing of the turret is accomplished through rotation of the cam shaft I 0. For this purpose the rear end of the cam shaft carries an indexing arm 20!! which, as the cam shaft I0 rotates, carries a roller 2IJI at its end successively in between pairs of indexing cam blocks 202 secured to the rear face of the disc 9, so that this disc becomes in effect a Geneva Wheel. The outer ends of the blocks 202 are beveled off, as at 204, to receive the cam roller 20I, and on each rotation of the arm 200, afterthe cam roller 20I has entered between one pair of cam blocks, the disc 9 is moved throughout an angular range suflicient to index the work from one tothe succeeding angular position, the turning of this disc 9 acting through the shaft 8 to produce a corresponding angular indexing motion of the turret 6.

Locking of the turret in indexed position between its indexing motions is produced by mechanism shown best in Figure 8. Referring to this figure, it will be seen that the outer edge of the drum turret 6 is provided with locking recesses 2I0 within which, at suitable times, may be projected a locking bar 2. This locking bar is guided for axial motion radial to the drum between stationary guide brackets 2| 2, and it is normally pressed inwardly so as to engage in one of the locking recesses when such recess is positioned opposite thereto, as by springs 2I3. As shown, each of these springs surrounds a guide rod 2I4 and reacts between a plate 2I5 engaging the rear end of the locking bar 2H and an abutment 2I6 adjustably secured to the outer end of the corresponding rod M4. The inner ends of these rods may be secured in the brackets 2I2. The locking bar may be retracted to permit indexing, by the rocking of a bell crank lever 220, fulcrumed at 22!, to a fixed part of the machine frame. An arm 222 on this bell crank lever has a pin 223 engaging a suitable part of the locking bar 2 I I, and the other arm 224 of this bell crank lever has pivotally connected thereto a link 225, the upper end of which is pivoted to an angle lever 226 fulcrumed at 221. This angle lever 226 has a. cam roll 228 which, as shown best in Figure 3, is arranged in the path'of rotation of an edge cam 229 secured to the cam shaft I3. This edge cam 229 is so shaped and positioned that it acts to actuate the bell crank lever 226 to withdraw the locking bar H I just before the indexing motion of the turret is to commence, and it releases this locking bar 2II in time so that, as the next adjacent locking recess 259 comes in position, it may be pressed thereinto by the springs 2I3. In order to hold the drum firmly in indexed position while the tools are operating upon the work, means are provided, as shown herein, for clamping the turret in indexed position during such periods. As shown best in Figure 8, this clamping means comprises a pair of shoes 230 positioned to engage the edge of the turret and hold it firmly against motion. These shoes 230 are cut away to form arcuate bearing faces 23! for engagement with the periphery of the turret, and they are shown as mounted for axial movement from and toward each other within a casing 232. In order to control their motions from and toward each other, they are shown as threaded on portions 233 and 234 respectively of a rock shaft 235, the threading being in reverse direction in these two portions so that as the rock shaft 235 is turned in one direction the blocks 230 are moved toward each other, thus to clamp against the periphery of the turret, and as it is turned in the opposite direction they are moved away from each other, thus to release the turret for indexing. The upper end of the rock shaft 235, as shown, is extended through a bearing bracket 260, above which the rock shaft has secured thereto an arcuate arm 26! provided at its end with a cam roller 262 for actuation by suitable cams which may be carried by the cam drum l6.

Work clamping and feeding mechanism The work in the form of bar stock, which passes through the work spindles, is clamped therein, and fed by any suitable type of collet and feed tube mechanism, the actuation of which will now be more fully described.

As shown in Figure 6, the spring collet 303 is controlled to grip or release the work by the axial position of a cam spool 30| movable axially of each spindle. Each cam spool has a cam portion 392, movable between a plurality of pivoted arms 303 in a well understood manner, to open or close the collet by axial motion of the collar 302. The feed of the work through each spindle is accomplished by axial motion of the spindle feed tube 305 which has an annular head 306 on its rear end by which it may be manipulated. The stock which extends into each spindle is supported rearwardly of the turret 3 by means of the work-supporting tubes, such as 338, which may be extended rearwardly and forwardly of the disc 9 to the desired extent to properly support the stock. The actuation of the collet collar 302 in suitable timed relation is accomplished through cams on the cam drum l6 which act on a follower roll 310 secured to a slide 3| I. This slide, as shown best in Figure 8, is guided for motion parallel to the spindles on suitable guides 3l2 of the top frame member 4, and it is provided at a suitable point with a depending lug 320 positioned to engage in an arcuate groove in any of a series of slides 32! carried for indexing with the turret, as shown in Figure 8, there being one such slide for each work spindle. Each slide 32! is mounted to slide on a pair of guide bars 322 carried by the turret and each is provided with an arcuate shoe 323 (see Figure 6) engaging in the annular groove 324 of the corresponding collet spool 300. This permits the collet spools to rotate relative to the slides 32I and permits the slides to move with the indexing of the turret so that they come successively into co-' operative relation with the actuating slide 3! l, whereby when the slide 3| I is actuated the corresponding collet collar 300 is actuated to release the work preparatory to a longitudinal feed thereof and then to grip the work after the feed has been accomplished.

The feed of the work is accomplished by actuation of a feed slide 330 mounted to move in a suitable guide way 33l on the under side of the frame portion 4 and provided with a cam follower roll 332 which may be actuated by suitable cams on the cam drum [3. This is best shown in Figure 9. As shown best in Figures 9 to 13, the slide 330 carries a second slide 335 mounted for sliding motion in the same direction as the slide 330 and against the lower face of this slide 330, being shown as held in position thereagainst by the track bars 336. This slide 335 has secured thereto a hardened wear block 33! positioned to engage on the inner or forward face of the various collars 306 of the feed tubes as these feed tubes are positioned successively in an angular position to cooperate therewith. Motion of the slide 335 to the left, as shown in Figure 6, will therefore cause the properly positioned collar 306 to be retracted preparatory to a feed motion of the tube. The feed motion is produced through impingement on the outer face of the collar 306 of a latch bar 338, pivoted as at 339, within. a slot 340 in the lower face of the slide 335. This latch bar is normally held down as far as permitted by the engagement of its rear end with the base of the slot 340, as by means of a spring-pressed plunger shown at 34! in Figure 6. This outer= abutment is formed as a latch bar so as to permit it to be retracted out of the way of the outer face of the collar 306, thus to permit the feed tube to be withdrawn from within the spindle as where it is desired to change feed tubes as when stock of a different size than that previously in the machine is to be handled. The slide 335, separate from the slide 330, is provided in order that the feeding stroke of the feed tube may be made yielding while the retracting stroke is made positive to return the feed tube to an adjustable but definite initial position from a constant amplitude of motion by the slide 330. For the purpose of such adjustment the rear end of the slide 330 is shown as downturned, as at 345, and through this downturned portion are two holes for the passage of a pair of screws 346 and 341. The screw 34'! is arranged above the level of the screw 346 and, as shown in Figure 12, it extends through a hole 348 in the slide 335, the outer or forward end of which is enlarged, as at 349. Within this enlarged portion rides a nut 350 engaging the threaded portion 35l of the screw 341. This enlarged portion 349, as shown in Figure 13, is not of round cross-section and the nut 35| is of similar contour so that the nut is held against rotation while in position within the opening 349. The screw 34'! is formed with a polygonal head 353 which may be engaged by a wrench so that it may be turned to adjust the position of the nut 350 along the rod 34?. This adjustment determines the rearward limit of motion of the feed slide 335, the slide 335 being pressed toward the nut 350 by a spring 352 reacting between the slide 335 and a collar 336 secured to the screw 348. The screw 343 is provided with a wrench-receiving head 355 and it is provided with a threaded end portion 356 which engages in a nut 35! normally seated in a socket 358 in the slide 355. This nut 357 has a portion engaging in a guideway 360 on the lower face of the slide 330 so as to prevent it from turning as the rod 355 is turned. A spring 36! surrounding this rod and bearing between the nut 35'! and the part 345 transmits yielding feeding pressure to the slide 335 when the slide 330 is moved to the right. On retraction of the slide 330 for a subsequent feed motion, the nut 350 engaging on the slide 335 insures the positive return of the feed tube to its starting position, the nut 353 riding idly in the slot 349 part way when the feed is less than that of the slide 330. The resilient or yielding feed of the stock is provided in order to insure a sufiicient feed to bring the stock up against an adjustable stock stop. This stop, as shown best in Figures 1, 2, 5, and 6, is formed as an arm 365 adjustably secured on the end portion of the cam shaft !0. It is provided with an abutment face 366, against which the stock is pressed, the parts being so related that the stock stop is presented in correct angular position about the axis of the cam shaft when the stock feed is produced so that the abutment 366 is in alignment with the spindle through which the stock is being fed. This stock stop is provided with a collar portion 361 at its inner end, which passes freely over the threaded extremity 368 of the cam shaft [0, and it is held in adjusted position thereon as by means of a pair of check nuts 369 and 310 engaged with the threaded portion 368 and arranged to clamp the hub portion 361 between them when the stop has been correctly positioned. These check nuts 369 and 310 are shown as provided with notched peripheries for the reception of a spanner wrench by which they may be manipulated.

Tool holding and controlling mechanism As previously stated, the tools are arranged to operate on the end portions of the stock projecting forwardly from the front face of the turret 6. One tool-carrying slide shown at 400 is mounted on the forwardly projecting end of the shaft 8. The tool slide 400 is shown as mounted on the bushings 40! and 402, within which the shaft 8 may rotate, and dust guards 403 and 404 are shown positioned between the tool slide 400 and the forward face of the turret 6 and over the forward end of the shaft 8 respectively. In order to hold the slide 400 against rotation with the shaft 8, it may have secured thereto a foot member 405 which slidably engages a guide 406 secured to the machine base. The slide 400 may be provided with longitudinally extending T-slots, as at 401, in substantially radial positions opposite to the various work spindles for the purpose of receiving suitable tool-carrying blocks (not shown). The tool slide 400 is arranged to be moved axially toward and from the several work spindles and for this purpose the foot 405 is shown as slotted for the reception of a link 4l0 pivoted at 4!! thereto, the outer end of the link 4!0 being pivoted to the upper end of an actuating lever 4!2. This lever M2 is pivoted at its lower end, as at 413, (see Figures 2 and to the machine base. Above the fulcrum, this lever 4!2 has pivoted thereto a coupling member 4!4 provided with a threaded socket to receive the threaded end of a rod 4l5. This rod 4l5 extends toward the back of the machine, as shown best in Figures 2 and 6, and at its rear end is threaded into a rocker block 4l6 journaled on a vertically arranged pin 4!1. This pin 4" is carried by the lower inturned end portion MB of a rocker yoke member 4I9 mounted to rock on a vertical pivot 420. This rocker member M9 is provided with a top arm 420 (see Figure 10) spaced above the arm portion M8 and above the shaft 8. This arm 420 is provided with a cam follower roll 42! at its inner end, with which cooperate suitable cams (not shown) on the cam drum I2, these cams acting at suitable times to rock the member 4!!! and, through its connection with the lever arm M2, to move the tool slide 400 toward and from the adjacent face of the work-carrying turret. Beside this tool slide 400, tool slides are arranged at opposite sides to be brought in or out relative to the axis of the turret, and a fourth tool slide is arranged substantially centrally above the turret axis. The side tool slides are shown at 430 and 43! (see in particular Figure 5). These are mounted for sliding motion transverse to the turret axis between upper and lower guides 432, 433, 434, and 435, and each of the slides is shown as adapted to removably receive tool-carrying blocks, such as 436, arranged at the proper heights to cooperate with work carried by the work spindles adjacent thereto in any indexed position of the turret. The slide 430 is arranged to be operated by rocking of a rocking member 440 secured to a vertical rock shaft 44 the rocker 440 having a pair of spaced arms as 442 and 443 connected by adjustable links 444 and 445 to the slide 430. Similarly, the slide 43! is connected to a vertical rocker member 448 secured to a vertical rock shaft 449 through the arms 450 and 45!, as shown best in Figure l. The limit of inward feed of the tool slides 430 and 43! may be adjusted independently for each indexed position of the turret. This adjustment comprises the plates 452 and 453, secured to the outer faces of the slides 430 and 43! respectively, and provided with the adjustable abutment screws, such as 454, there being one set of screws for each of the work spindles. These screws are successively contacted at the various indexed positions of the turret by abutments, such as 451, carried by swinging arms 458, these arms being shown best in Figures 1, 2 and 8 on opposite sides of the machine. Each of these arms is fixed to a rock shaft 459 carrying an arm to which is pivoted a link 460. Each of these links is pivoted to a rock arm 46! and both of the arms 46! are secured to a rock shaft 462, as shown best in Figure 8. To this rock shaft is secured a rocker arm 463 which is connected through a bar 464 (see Figures 1 and 6) to a crank arm 465 positioned adjacent to the rear portion of the frame member 3. As shown best in Figure 6, the rock shaft 466, within the frame 3, is provided with a cam arm 461, with which engages an edge cam 468 secured to the inner face of the disc 9, as by bolts 469. This edge cam is so shaped that, as the turret is" indexed, it moves the stops on the arms 458 so that, as the turret is indexed from one to a succeeding working position, the stops on the arms 458 are brought sequentially into glggrative relation to the adjustable stop screws The rock shaft 44!, which moves the tool slide 430, is actuated through a rocker arm 415 secured to the upper end of the rock shaft 44! to which is connected a link 416, the opposite end of which is pivoted as at 411 (see Figure 3) to a cam slide 418. This slide carries a cam follower 419 for actuation by suitable cams on the cam drum 4. The rock shaft 449, by which the tool slide 43! is actuated, has secured to its upper end a rock arm 480 similarly connected through a link 48i with a cam slide 482 provided with a follower roll 483, with which may cooperate suitable cams on the-cam drum !5. The cam slides 418 and 482 are mounted on the top edges of the frame member 4.

The vertically movable tool slide 490, as shown best in Figures 5 and 6, is apertured at 49!, to permit the passage therethro-ugh of the cam shaft I0, the axis of which is within the outline of this slide. This slide is mounted between suitable fixed gudes 492, as shown in Figure 5, and is arranged to removably support tool-carrying block 493, facing downwardly toward the upper work spindle. The slide 490 is provided with an upwardly extending lug 496 at its upper end for pivotal connection, as through a pair of links 49! with a rock arm 498. This rock arm is pivoted at 499 to a crossframe member of the frame part i and, as shown best in Figure '7, it is provided with a downwardly curved actuating arm 509 provided at its lower end with a cam follower roll 50!, with which cooperate cams on the drum I'l, thus to provide an up and down motion of the tool slide 490.

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 can be made without departing from the scope of this invention, as defined by the appended claims.

I claim:

1. A multiple spindle lathe comprising a bed, a pair of spaced frame portions upstanding from said bed, a pair of members journaled coaxially in said frame portions, a shaft coaxial to said members and secured thereto, one of said members being a turret, a plurality of work spindles carried in circular array about said axis by said turret, means positioned between said members and beyond one side of said turret for controlling the stock carried by said spindles, said shaft being extended on the opposite side of said turret from said controlling means, a tool slide on said shaft extension, means for indexing said turret, and means for moving said tool slide axially of said extension, the ends of said spindles on the tool side of said turret being substantially unobstructed except for said tool slide and parts carried thereby.

2. A multiple spindle lathe comprising a bed, a pair of spaced frame portions upstanding from said bed, a pair of members journaled coaxially in said frame portions, one of said members comprising a turret, a plurality of work spindles carried by said turret in circular array about said axis, work controlling mechanism cooperating with said spindles between said members, a tool carrier on the opposite side of said turret from said controlling mechanism, and means for controlling said carrier, the ends of said spindles on the tool side of said turret being substantially unobstructed except for said tool slide and parts carried thereby.

3. A multiple spindle lathe comprising a bed, a pair of spaced frame portions upstanding from said bed, a pair of members journaled coaxially in said frame portions, one of said members comprising a turret, a plurality of work spindles carried by said turret in circular array about said axis, work controlling mechanism co-operating with said spindles between said members, a tool carrier on the opposite side of said turret from said controlling mechanism, means for controlling said carrier, means connecting said turret and member for simultaneous rotation, and means acting on the other of said members for indexing said turret, the ends of said spindles on the tool side of said turret being substantially unobstructed except for said tool slide and parts carried thereby.

4. A multiple spindle lathe comprising a bed, a pair of spaced frame portions upstanding from said bed, a pair of members journaled coaxially in said portions, a shaft coaxially connecting said members, one of said members comprising a turret, a plurality of work spindles parallel to said shaft and in circular array about said axis in said turret, a tubular work support carried by the other of said members in alignment with each work spindle, a frame member connecting the upper parts of said frame portions, a cam shaft journaled in said frame member, means for feeding stock through said work spindles, means positioned between said journaled members for actuating said feeding means, cams carried by said cam shaft for controlling said actuating means, turret indexing means actuated from said cam shaft, and means for turning said cam shaft.

5. A multiple spindle lathe having a rotatable turret, a plurality of work spindles carried by said turret in circular array about its axis of rotation, a tool carrier positioned at one side of said turret for supporting tools for operating on work projecting from the adjacent ends of certain of said spindles, and means substantially entirely back of said ends for rotating said spindles, the ends of said spindles on the tool side of said turret being substantially unobstructed except by said tool carrier and parts carried thereby.

6. A multiple spindle lathe having a rotatable turret, a plurality of work spindles carried by said turret in circular array about its axis of rotation, a tool carrier positioned at one side of said turret for supporting tools for operating on work projecting from the adjacent ends of certain of said spindles, and means located at the opposite side of said turret from said carrier for rotating said spindles, the ends of said spindles on the tool side of said turret being substantially unobstructed except by said tool carrier and parts carried thereby.

7. A multiple spindle lathe having a bed and a rotatable turret, a plurality of work spindles carried by said turret in circular array about its axis of rotation, a shaft coaxial with said turret, a tool slide on said shaft and slidably guided on said bed to move toward and from work projecting from ends of said spindles at one side of said turret, means located entirely on the other side of said turret for rotating said spindles, and means for actuating said tool slide, the ends of said spindles on the tool side of said turret being substantially unobstructed except by said tool carrier and parts carried thereby.

'8. A lathe comprising a Work spindle through which bar stock may pass, a shaft arranged parallel to said spindle, means carried by said shaft for feeding stock through said spindle, means carried by said shaft for limiting the extent of such feed, and means for turning said shaft.

9. A multiple spindle lathe comprising a bed, a frame portion upstanding from said bed, a turret journaled in said frame portion, a plurality of work spindles arranged in circular array in said turret, means for indexing said turret, means for feeding stock in said spindles, a cam shaft, cams on said shaft controlling said stock feeding means, means for rotating said shaft, and a stop carried by said shaft and arranged to be presented opposite to a work spindle when stock is being fed therethrough in position to limit the extent of such feed.

10. A multiple spindle lathe comprising a bed, a frame portion upstanding from said bed, a turret journaled in said frame portion, a plurality of work spindles arranged in circular array in said turret about its axis of rotation, means for indexing said turret, means for feeding stock in said spindles, a cam shaft positioned parallel to said axis, cams on said shaft controlling said 75' stock feeding means, means for rotating said shaft, and a stop carried by said shaft and arranged to be presented opposite to a work spindle when stock is being, fed therethrough in position to limit the extent of such feed.

11. A lathe having a work spindle for receiving bar stock, means acting at predetermined times to feed the stock through said spindle, a cam shaft, means actuated by cams on said shaft for actuating said feeding means, and a stop carried by said shaft and arranged to be presented by turning of said shaft into position to limit the amount of feed of said stock and then to be moved away therefrom.

12. A lathe having a work spindle for bar stock, means acting at predetermined times to feed the stock through said spindle, a cam shaft, means actuated by cams on said shaft for actuating said feeding means, a tool for acting on the stock so fed, means for actuating said tool, and a stop carried by said shaft and arranged to be presented by turning of said shaft into position to limit the amount of feed of said stock and then to be moved away therefrom and maintained away during the action of said tool.

13. A multiple spindle lathe comprising an indexing turret, a plurality of work spindles arranged in parallel circular array about the indexing axis of said turret, a frame member above said turret, opposed tool carriers movable toward and from each other on opposite sides of said turret, a tool carrier movable parallel to said axis, a tool carrier substantially centrally disposed above and movable toward and from said axis and carried by said frame member, a cam shaft carried by said frame member and having cams for controlling said carriers, and means for actuating said cam shaft.

14. A multiple spindle lathe comprising an indexing turret, a plurality of work spindles arranged in parallel circular array about the indexing axis of said turret, a frame member above said turret, opposed tool carriers movable toward and from each other on opposite sides of said turret at one end thereof, a tool carrier movable parallel to said axis, a tool carrier substantially centrally disposed above and movable toward and from said axis and carried by said frame member, a cam shaft carried by said frame member and having cams for controlling said carriers, means for actuating said cam shaft, and means positioned at the opposite end of said turret for feeding and clamping the work carried by said work spindles.

15. A multiple spindle lathe having a turret, a plurality of work spindles arranged in circular array about the axis of said turret, a frame member, a tool carrier slidably mounted on said member for movement transverse to said turret axis for supporting a tool for operation on work carried by said spindles, a shaft arranged substantially parallel to said axis, the axis of said shaft extending within the outline of said carrier, means actuated by said shaft for moving and controlling said carrier, and means actuated by said shaft for controlling the feed of stock relative to said spindles.

16. A multiple spindle lathe having a turret, a plurality of work spindles arranged in circular array about the axis of said turret, a frame member, a tool carrier slidably mounted on said memer for movement transverse to said turret axis for supporting a tool for operation on work carried by said spindles, a shaft arranged substantially parallel to said axis, the axis of said shaft extending within the outline of said carrier, means actuated by said shaft for moving and controlling said carrier, and means actuated by said shaft for indexing said turret.

17. A multiple spindle lathe having a turret, a plurality of work spindles arranged in circular array about the axis of said turret, a frame member arranged above said turret, a tool carrier slidably mounted on said frame member transverse to said turret axis for supporting a tool for operation on work carried by said spindles, a shaft supported by said frame and arranged substantially parallel to said turret axis, the axis of said shaft extending within the outline of said carrier, means controlled by said shaft for moving said carrier, and means actuated by said shaft for controlling the feed of stock relative to said spindles.

18. A multiple spindle lathe having a turret, a plurality of work spindles arranged in circular array about the axis of said turret, a frame member arranged above said turret, a tool carrier shdably mounted on said frame member transverse to said turret axis for supporting a tool for operation on work carried by said spindles, a shaft supported by said frame and arranged substantially parallel to said turret axis, said carrier having an opening through which said shaft extends, a stock stop carried by said shaft forwardly of said carrier, and means driven by said shaft for actuating said carrier.

19. A multiple spindle lathe having a turret, a plurality of work spindles arranged in circular array about the axis of said turret, a frame member arranged above said turret, a tool carrier slidably mounted on said frame member trans verse to said turret axis for supporting a tool for operation on work carried by said spindles, a shaft supported by said frame and arranged substantially parallel to said turret axis, the axis of said shaft extending within the outline of said carrier, and means controlled by said shaft for moving said carrier and for controlling said turret.

20. A lathe having a frame member, a work spindle adjacent to said member, a tool carrier slidably mounted on said member transverse to said spindle for supporting a tool for operation on work carried by said spindle, said carrier having a hole therethrough, a shaft arranged substantially parallel to said work spindle and extending through said hole, means for feeding stock through said spindle, a stock stop carried by said shaft forwardly of said tool slide and movable by the turning of said shaft from and to a position opposite to the said spindle to stop the feed of work through said spindle when opposite thereto, means for turning said shaft, and means for moving said slide to effect tooling action on the work while said stop is out of stopping angular position.

21. A lathe having a frame member, a work spindle adjacent to said frame member, a tool carrier slidably mounted on said member transverse to said spindle for supporting a tool for operation on the work carried by said spindle, said carrier having a hole therethrough, a shaft arranged substantially parallel to said work spindle and extending through said hole, means actuated by said shaft for feeding stock through said spindle, a stock stop carried by said shaft forwardly of said tool slide and movable by the turning of said shaft from and to a position opposite the said spindle to stop the feed of work through said spindle when opposite thereto, means for turning said shaft, and means for moving said slide to effect tooling action on the work While said stop is out of stopping angular position.

22. A lathe having a frame member, a work spindle adjacent to said frame member, a tool carrierslidably supporting a tool for operation on the work carried by said spindle, said carrier having a hole therethrough, a shaft arranged substantially parallel to said Work spindle and extending through said hole, a stock stop carried bysaid shaft forwardly of said tool carrier and movable by the turning of said shaft from and to a position opposite the said spindle to stop the feed of work through said spindle when opposite thereto, means for turning said shaft, and means actuated by'said shaft for moving said carrier to efiect tooling action on the work while said stop is out of stopping angular position.

23. A lathe having a frame member, a work spindle adjacent to said frame member, a tool carrier slidably mounted on said member transverse to saidspindle for supporting a tool for operation on the work carried by said spindle, said carrier having a hole therethrough, a shaft arranged substantially parallel to said work spindle and extending through said hole, means actuated by said shaft for feeding stock through said spindle, a stock stop carried by said shaft forwardly of said tool carrier and movable by the turning of said shaft from and to a position opposite the said spindle to stop the feed of work through said spindle when opposite thereto,

means for turning said shaft, and means actuated by said shaft for moving said carrier to effect tooling action on the work while said stop is out of stopping angular position.

24. In a lathe, a tubular work spindle, a feed tube within said spindle reciprocable to feed bar stock therethrough, a main slide mlovable substantially parallel to said feed tube, a second slide mounted on said main slide, and operatively connected to said feed tube, a pair of screws extending between said slides, a nut carried by each of said screws and held against rotation by said second slide, said nuts being positioned on opposite sides of said second slide and determining limits of relative sliding motion therebetween, spring means reacting between said slides for pressing said second slide in feeding direction, and means for moving said main slide.

.25. Amultiple spindle lathe comprising a turret, a plurality of spindles carried in said turret, tool carriers positioned to cause tools carried thereby to operate on Work projecting from one end of said turret, a shaft, cams on said shaft for controlling various actions of the lathe including the movement of said tool carriers, power means for turning said shaft, and means accessible to the operator positioned adjacent toand facing said end normally inoperative but rendered operative by the operator for turning said shaft by hand.

FRANK L. CONE.

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