US1829284A - Chucking machine - Google Patents

Description

6 Sheets-Sheet l gwn/Coz Oct. 27, 1931. A. .1.I I Ewls 1,829,284

CHUCKING MACHINE Fil'ed May 14l 1929 e sheets-sheet 2 Oct. 27, 1931. A. J. LEWIS CHUCKING MACHINE Filed May 14. 1929 6 Sheets-Sheet 3 01.27', 1931. A. J. Ewls 1,829,284

` CHUCKING MACHINE Filed May 14. 1929 e Sheets-Sheet 4 Oct. 27, 1931. A. J. LEWIS 1,829,284

CHUCKING MACHINE Filed May 14. 1929 e sheets-sheet 5 Oct. 27, 1931. A. J. I Ewls CHUCKING MACHINE:

Filed May 14, 1929 6 Sheets-Sheet 6 Patented Oct. Y27, 1931 entre ARTHUR J. LEWS, 0F STRATFORD, CONNECTI'T, ASSIGNOR TO THE BAIRD MACHINE COMPANY, GE BRBGEPRT. CONNECTICUT, A. CGRORATOH OF CONNECTCUT CHUCKING- MACHINE Application lefl 5.4,

This invention relates to metal working machines and more particularly to a so called chucking machine in which there are a plurality of work carrying spindles mounted in a 'rotatable turret with means for indexing whereby the turret and associated spindles may be assembled as a unit, and mounted as such in the machine.

It is also an'object of the invention to provide improved means for driving` the work Ispindles, and also improved means for mounting and operating the spindle driving means.

lt is another object of the invention to provide an improved indexing mechanism for the rotatable turret which will be reliable in operation and which will be much simpler in construction than the indexing means now generally employed.

lt is an another object of the invention to provide an improved and simplified driving mechanism for the tools, and a feed drive mechanism which may be assembled as a unit and applied as such to the mechanism.

It is still another object of the invention, to provide an improved automatic control to synchronize the various operations.

lVith the foregoing and other objects in view, the invention consists in certain novel features of construction, combinations and arrangements of parts as will be more fully disclosed in connection with the accompanying drawings.

'In these drawings Fig. l is a partial side elevation and partial longitudinal vertical section of the machine.

Fig. 2 is a partial elevation and partial vertical section of the driving mechanism for the work spindles and indexing mechanism for the turret.

semi no. 362,974.

Fig. 3 is an end view looking from the right of Fig. 2 with the turret removed and with one of the drive spindles in section.

F ig. t is a partial side elevation and partial longitudinal section of the turret and mounting means therefor.

Fig. 5 is a partial end elevation and a partial transverse section looking from the right of Fig. 4.

Fig. 6 is 'a partial elevation and partial longitudinal section of the driving means for the work spindles.

Fig. 'T is a side elevation of the turret showing how it may be mounted or removed as a unit.

Fig. 8 is a detail section substantially on line 8 8 of Fig. 6.

Fig. 9 a partial vertical section and partial elevation of the main drive and the feed drive for the control drum and tool feed.

l? ig. l0 a transverse section substantially on line lO-lO of Fig. 9 with certain elements shown in elevation, and with the feed drive clutch in a different position,

F ig. ll is a detail of one of the drive clutches and its control means showing the clutch released, and

Fig. 12 is a detail section substantially on line 1:2-12 of Fig. l0.

Turret-The machine in general includes a bed 13 mounted on any suitable supports, not shown, and a frame 14 carried by the bed. This frame is open at its forward end to receive the rotatable turret 15 which carries a plurality7 of Work carrying spindles 16 mounted for rotary movement in the turret and each carrying at their forward end any suitable chuck 17 for holding the work to be operated upon. n the present instance there are six of these work spindles carried by the turret, but it will, of course, be understood that there may be more or less as is found desirable. The turret is of general circular shape in cross section and has an external beari g i8 fitting in an internal bearing in a bearing ring 19. The inner end of this ring is engaged by an annular shoulder 20 and the ring has a flange 2l by means of which it may be scoured to the front face of the frame 14 by any suitable means, such as the screws 22.

The front face of the turret is rabbeted at 23 to receive a retaining ring 24 secured to the turretby any suitable means, such as screws 25. This retaining ring engages the outer end of the bearing ring 19 and therefore, the

turret is retained in this bearing ring by the shoulder 2O and the ring 24 and is at the same time free to turn in the ring 19. A packing26 may be placed at thefouter end of the ring .24,and held there by la ring` 27 to prevent entrance of dirt to the bearlng for the' turret. l The work carrying spindles 16 are preferably hollow and are mounted in suitable bearing bushings 28 and 29 mounted in the turret, 'and at Vtheir inner ends each spindle carries a collar 30 which forms one member of a' clutch for driving the spindles. v In the present 'instance thesecollars carryteeth 31 adapted to mesh with similar teeth 32 on the driving clutch member 33.

Spz'ndle 'drive'.-The drive mechanism for the'work spindles is shown more clearly in Figs. v2, 3, 6 and 8. Mounted for longitudinal sliding Vmovement in frame 14 are sleeves 34 in each of which is mounted a driving shaft or spindle 35. Thereare,'how ever, only five of,v these driving spindles, one

' less than the number of work spindles, so

305 that the work spindle at one of the stations,

inthe present drawing the spindle at the V'station 36, is not driven and this, therefore,

forms a loading station at which a finished piece of work may be removed and a new or unfinished piece of work placed in the chuck on the spindle while the other spindles are operating, and the tools are performing certain operations on the work carried by the spindles at the remaining stations; Each work spindle 35 is driven by a gear meshing with a gear on a central drive shaft 37. In order that the work spindles may be driven at different speeds, the spindles 35 are of sufficient length to receiveanyone of a number of spur gears 38, 39 and 40 of different diameters adapted to mesh with the gears 41, 42 or 43 respectively, on the central shaft. The gears 38, 39 or 40 are located on their respective'spindles by suitable spacing lcollars 44 to mesh with the proper gear 41, 42 or 43. It will',of course, be understood as these gears are'of different diameters, a spindle 35 will be driven at its highest speed when the smaller gear 38 is on vthe spindle to mesh with the larger ydriving gear 41, theV spindle is driven at its lowest speed when the larger gear 40 is on the spindle to mesh with the smaller driving gear 43, andan intermediate speed will be given by gears 39 and 40.l However, after the gears are once set up these speeds of the spindles are maintained the same, unless the gears on the spindlesl are removed and gears of different diameters substituted.

.As/indicated above these sleeves 34 are mounted for longitudinal sliding' movements' in the frame 14 and they each carrya drlvlng clutch member 30 to disconnect thefdriving connection between the driving spindle and the work spindle to permit indexing of the turret for bringing the next work spindle into alignment with any given driving spindie. F or this purpose each sleeve 34 is provided with a lateral lug or ear 45 which is guidedjin a suitable notch or recess 46 in the frame to thus prevent turning of the sleeve in the frame. A compression spring 47 engages one side of this lug and tends to shift the sleeve andthe driving spindle 35 toward the work spindle to causethe clutch members 33 and 30`t'o engage. At its opposite side each lug 35 is engaged by a flange 48 on a sliding block or sleeve 49 supported on the shaft 37. A forked lever'50 embracesthis shaftand the block or sleeve 49 and is pivoted in the'frame at 51. It has a'vlug 52 en gagingthe flange 48 on the opposite side 'from the lugs 45, and the free yend of the vlever is driven by means which will later be de scribed, As .the cam 34 engages the roller 53 on rotation of the shaft 55, it may shift the lever to the left as viewed in Fig. 6 and shift the flange 48 to the left, and with it all of the sleeves 34 and driving shafts 35 against the action ofthe springs 47, to thus simultaneously disconnect all the clutches 33, 30 and thus permit indexing of the turret. It will, of course, be understood theelements are held in this position by the block-56 of the cam during the indexing operation and then the lever 50 is released permitting the springs 47 to shift the sleeves 34 and driving shafts 35 to the right .to permit engagement of the clutch members 33 and 30 to drive Vthe work spindles for thenext working operation.

I Mieming mec/tamtam (Fz'gsjQ, L cmd) Carried on the .shaft is a block or collar 57 provided with radial groove 58 in which is adjustably mounted 'a lever 59. The block 57 is keyed totheshaft by a key 60 rwhich is also adjustable longitudinally of the shaft and is inclined at one end as indicated at 61 to engage the bottom 62 fof a notch in the arm 59 and form a wedge by which the radial position of the arm 59 may be adjusted. The key Yand wedgemay be secured in an adjusted position bythe set screws 63. The arm 59 also has an elongated slot 64 to receive the head 65 of a. clamping'bolt to secure the arm in adjusted position. The arm carries a relatively large roller 66 to engage the side of the collar to rotate the turret witha step by step movement as'indicated by dotted llines in Fig. 5. At the beginning of the indexing movement the work spindles have not stopped rotating although their driving clutches have been disconnected. The roller 66 is therefore, so mounted that it engages the member 30 and prevents the arm 59 engaging this member. The roller 66 is an antifriction member and prevents the arm 59 digging into member 30 asit would be likely to do if this arm engaged this member direct. 1t is preferable to mount the roller 66 on roller bearings as indicated at 66a. Of course, between the indexing movements the turret should be locked in proper position with the work spindles `16 in alignment with the drivingl spindles This is done by means of notches 67 suitably spaced throughout the periphery of the turretand adapted toreceive the end of a locking bolt 68 slidably mounted in the frame. A compression spring 69 tends to force the locking bolt 68 toward the turret and holds its end in one of these notches during the working portion of a cycle. The bolt vris retracted at the proper time to unlock theV turret by means of an arm 70 pivoted in the 'frame at 71, and having another arm 72 carrying a roller 7 3 to cooperate with the cam 74on the block 57, and so arranged as to retract the bolt 68 and unlock the turret just prior to the indexing operation, and also having a surface 75 to retain it unlocked until the indexing is completed. Of course, as the block 57 andthe cam 56 are on the same shaft 55, the clutches 33, 30 are engaged and released in certain timed relation with the indexing operation. The roller 66 and the arm 59 are so proportioned and shaped as to properly posit-ion the turret at the end of the indexing operation to permit proper locking of the turret for engagement of the clutches 30, 33.j As `shown indotted lines Fig` 5 the roller 66 moves the member 30 together with the turret to a position to bring a notch 67 in alignment with the locking bolt 68. The side of the arm 59 is shaped to prevent the turret going too far and thus not properly locking. The side 59a of this arm is so shaped that when in the dotted position of Fig. 5 side 59a is immediately in fro-nt of the member 30 on the lower spindle and thus prevents the turret turning too far'.

Driving mechanism-Gears41, 42 and 43 are driven by pinion 76 meshing with the gear 41. Pinion 7 6 is mounted on a shaft 77 which is driven by gears 78 and 79 through the gear train 80, 81, 82 and 83. The gears 82 and 83v are integral and are driven through the clutch 84. They are, however, of different diam-eters, and gears 81 and 80 are of different diameters to mesh respectively with the Vgears 82 and 83. The gears 81 and 80 are 4connected togetherand are slidable on the shaft 85 so that either gear 81 may mesh with gear 82 to give one speed to the driving shaft 77 or gear 80 may mesh with gear 83 to give another speed to this shaft. The gears 81 and 80 maybe shifted through a suitable collar 86 by any suitable means as a lever, not shown. The other member 87 of the clutch 84 is mounted on a. shaft 88 driven from any suitable source of lpower such as a counter shaft or an electric motor through a pulley 89. VClutch member 87 is movable to and from engagement with the member' 84 by the means of levers 90 cooperating with the groove collar 91 slidable on the shaft 88 by means of a bell crank lever 92 pivoted at 93 and connected by link 94 with the arm 95 of a lever pivoted in the frame at 96 and having another arm 97 carrying a roller 98 to cooperate with a cam 99 on the control drum 100, which thus releases and engages the clutch 84 in certain timed relation with the other operations. It will be understood that the clutch member 84 is secured to the gears 83 and 82, but this clutch member and the gears are free to rotate on the shaft 88 so that when the clutch 87, 84 is released the shaft may be driven or rot-ate'without driving the gea- rs 83 and 82.

The shaft 88 carries a spiral gear 101 meshing with a similar gear 102 upon an upright shaft 103 for driving this shaft. The member 105 is keyed by the key 110 to the member 111 of a lower clutch cooperating with a movable clutch member 112 controlled by a lever 113, pivoted yat 114, and cooperating with the grooved collar 115 for shifting the clutch member 112. This clutch member 112 drives the shaft 116. The other arm 117 of the lever 113 is connected by link 118 with a handle lever 119. The crank arm 120 for operating the upper clutch 104 through the grooved collar 121 is connected to a link 122 with a bell crank lever 123, pivoted at 124, and carrying on its other arm a roller 125 adapted to cooperate with cams 126 and 127 mounted on the shaft 55 for shifting the clutch 104 in opposite directions in certain timed relation with the other operations of the device. The upright shaft 103 also carries a spur gear 128 meshing with the gear 129 on a second upright shaft 130. Splined to this shaft 130 so as to rotate therewith, but slidable longitudinally thereon is a pair of connected gears' 131, 132, gear 131 being adapted to mesh with the gear 106, while the gear 132 is adapted to mesh with the gear 107, and the gears 131, 132 may be shifted by a hand lever 133. 1t will be apparent that when the gear 131 is in mesh with the gear 106 the member 111 will be driven at a less speed than when the gear 132 is in mesh with the gear 107, and therefore, the speed of the feed of the tools may be varied. Gears 106 and 107 are keyed to the collar 109 which may turn on the sleeve 1054 of the member 105, and the collar .109 has ratchet teeth 128 to cooperate with the pawl108 carried by .the member 105. Thus during normal feeding operations,that is during the work cycle the shafty 116 is driven through the gears 101, 102, 128, 129, shaft 130, gears 131 - org132lto 106 or 107, theratchet 109,108, member k105 to member 111 and clutch 112. course, with this drive the' clutch 104 isreleased. Now, at the end of the working period of the 'Y tools the. cam 126 cooperating with the roller 125 shifts the clutch member 104 tothe posi-V tion of'Fig. 1'0 to engage the clutch 105, the

- time lost between the work operations. The

shaft 116 carries a worm 134 meshing with` a wormgeare135l on the shaft 136 which carries a pinion 137 ,meshing with any internal gear 138 in thecontrol drum 100 mounted on they-shaft 55. This drive mechanism, it Awill be seen fromthe drawing, is assembled in a casing 1 58 which is secured to the frame 14 by any suitable means as screws 151. Thus this drive can beassembled in the casing and the whole assembled in the machine asa unit.

Means is provided for operating the controldru'm-100 and the indexing mechanism handif desired to facilitate setting up the machine. Y For lthis purpose land `disconnecting lthe ,power drive the clutch 112,isnprovided, and it is `operatedj'by the grooved collar 1:15 slidablejon the shafti-116. This; 'cole' lar has clutch `,teeth 139 on its lower `end adapted to mesh with clutch teeth .140 on a spiral .gear 141 rotatable on the Asha-ft 116 yand y'meshing with a spiral gear 142 Ona-shaft 143. lShaft 143 may be vrotated by l.a hand crank144. If now, the operator when setting up vthe machinewishes `to operate it by hand, he pulls forward the hand lever 119. This slides the'collar115 downwardly, releases Vclutch 112, and brings the teeth l139 on the collar 115 into mesh with the teethg140 on the gear'141. Ifnow the operator turns the handle 144, -he'will rotate the shaft 116 through -the gears 142, 141 and the collar 115 .as this collar is splinedtor the kshaft 116. It Vwill be noted from this construction andarrangement that .at no .time can the hand drive and the automatic drive be connected to the shaft 116 at the same time. That is, shiftingy `,clutch,V1-'12 vwill )necessarily disengage the durch 13.9, 140- l ing and turns in the ring 19, buti't also has a bearing 148 on the 'support 145, and it is therefore, very rigidly mounted in a manner which will reduce to aminimum lateral play of the turret, and the liabilityrof its work spindles getting out of alignment with the driving spindles or failingto .be in proper relation with respect to the tools. vkThe tools for each station may be mounted to slide longitudinally of the .support Y 145. Holder carriers for these tools are indicated diagrammaticallyat 149, there being aV tool carrierl for thework spindle at each station eXceptthe spindle at the lloading' station 36 so that there is one less-tool carrier .than work spindles. V,The tool carriers are slid longifV tudinally'of the support .45 by meanswithin the support similar to that shown in my prior patent 1,689,440October30, 1928 and lcomprises vconcentric shafts 150A and 151 mounted for longitudinal,movement within the support 145 and each carrying blocks152forconf nec'tion with they arms 153 onthe,toolslides. These'shafts are connected to blocks 154, carrying rollers 155, cooperating with cams 156 and 157011 the control .drum'100to regulate the movement of the tools in `certain timed relation with the indeXing yof the turret and theother operations kas above described., i

The operation will beclear from :the fore'- going description. During the .work period, `the work spindles 16, except. the onev at kthe loading station 36, will be 'driven by .the'driving .shafts or spindles 35 through thefclutch drives 33, A30, and during this ktime thetools will be' advanced' toward thework through the feed mechanism within thejtoolsurpport 145 and the cam on .theeontrol drum. This drum is driven as indicated abovejthrough the ymechanism as shown in Figs. .9y and 10.

Vhen the work has been` completed the clutch 104 is engaged speeding up =the operation of the drum for rapid movement of the tools away fromk the work. The .main

drive clutch 84, 87 is also released, andthe drivingY connection between the vdriving shafts 35 Vand the work spindles 16 is disconnected by shifting of the drive shaftsto the position of Fig. ,2 bymeans of the cam V56 and lever 50. Theindexing mechanism ynow functions to YfirstV unlock the turret and then turn'the turret one-sixth ofa revolution to advance .each -work spindle to the next vsucceedingstation, after which the turret is again locked, the drive shafts 35 may be .per-

ing the clutch 112 through the hand lever Having thus set forth the nature of my invention, what I claim is:

l. In a machine of the class described, a frame having an opening therein, a bearing member having an extension removably mounted in said frame opening, said member having a shoulder to engage a shoulder on Vthe frame to position the member, a turret rotatably mounted in said member, a central support passing through the turret and having a. central bearing therefor, the central bearing and the external bearing member forming the sole support for the turret, a plurality of work holders vmounted in said turret, and means for rotating the turret with a step by step movement.

2. Ina machine of the class described, an

upright frame openfat one vertical side, a bearing ring removably mounted in the fra-me at said open side, Va turret mounted to rotate in said ring about a` horizontal axis, a horizontal support forming a central bearing for the turret, said bearing ring and central forming the sole support for the turret, a plurality of work holderscarried by the turret, and means for rotating the turret with a step by step movement.

3: In a machine of the class described, a frame, a rotatable turret, a plurality of work holders carried bythe turret, a supporting bar supported in the frame on opposite sides of the turret, said turret having a bearing on said bar, a bearing member embracing Athe turret and forming an external supporting bearing therefor, means for removably mounting said member in the frame, and means for rotating the turret with a step by step movement.

f4. In a machine of the class described, a frame having spaced upright portions, a horizontal supporting bar mounted in said portions and extending between them, Aan upright turret mounted to rotate on said bar, a lbearing member embracing the turret and forming an external bearing therefore, said `bearing member being removably mounted in the frame kand said memberand the suuporting bar forming the support for the turret, a plurality of work spindles carried by the turret and extending parallel to said bar, and means for rotating the turret with a step by step movement.

5. In a machine of the class described, a frame having spaced upright portions, a hollow horizontal tool support extending between said portions and supported thereby, a rotatable work carrying turret mounted to turn on a. central bearing on said support, an

external supporting bearing for the turret removably mounted in the frame, a tool slide mounted on the support forwardly of the turret, means in the support for operating the tool slide, and means to the rear of the7 0 turret for operating the tool operating means.

6. In a machine of the class described, a frame having lspaced upright portions, a horizontal supporting bar mounted in said portions and extending between them, a rotatable work carrying turret mounted to turn `on a central bearing on said bar between said frame portions, and an external bearing for the turret removably mounted in the frame, said external and internal bearings forming the support for the turret.

7 In a machine of the character described, a frame, a rotatable turret having a bearing on its outer surface, a shoulder at the innerxr end of said surface, a ring bearing enclosing said bearing on the turret and engaging said shoulder at one side, a retaining member secured to the turret and engaging said bearing ring on the other side, means for mount-" ing said bearing ring in the fra-me, work carrying means mounted in the turret, and means for indexing the turret.

8. In a machine of the character described, a rotatable turret, a plurality of work carry- 'l ing spindles mounted in said turret and projecting from one end thereof, an indexing mechanism including a rotating member and means to rotate said member completely in one direction about its axis, and an armi" carried by said rotating member arranged to engage said projecting portions in succession to turn the turret with a step by step movement, said arm being mounted to operate from outside the turret and to extend` inwardly between two adjacent spindles.

9. In a machine of the character described, a rotatable turret, a plurality of work carrying spindles 'mounted in said turret, a driving clutch member secured to the inner end of each spindle, driving spindles having clutch .members to engage those on the work spindles, means for shifting the driving' spindles toward and from the work spindles to engage and disengage said clutches, an in-r flexing mechanism including a rotatable member, an arm on said rotatable member adapted to engage the clutch members on the work spindles to index the turret, and means for rotating said arm and shifting the driv 20 ing spindles in certain timed relation.

l0. In a machine of the character described, a rotatable turret, a plurality of work carrying spindles mounted in said turret, a driving clutch member secured to the inner end of each spindle, driving spindles 125 having clutch members to engage those on the work spindles, means for shifting the driving spindles toward and from the work spindles to engage and disengage said clutches. a

rotatable member, an arm carried by said 130 cession to rotate the turret with a step by'step movement.v

5 11.7111l a machine of the character ydescribed, a frame, a rotatable turret, worlr spindles carried by the turret each having a clutch member at its inner yend, driving spin- -dles'inalignment with the workspindles, 'sleeves forming bearing mounts one for eachV drivingfspindle and mounted to slide in the frame toward and from the work spin- .ing afone way drive, a control shaft ldriven Adle, ya clut'ch member on .each driving spindle complementary-to vthose ou the work spindles, means for driving the wrorlcspindles, means for `shifting the j driving 'spindle sleeves, and means yfor indexing the turret in ter means. A

Y12. In a machine of the character described,v a-'frame.'a work spindle, a clutch member carried by said spindle, a' bearing sleevemountediin the'frame in axial align- Vment withv said spindle'to Vslide longitudi- -Wftimed relation with the operation ofthe-lat-V a Vspring'tending to shift-the sleeve toward the spindle, a" vdriving shaft carried b v the sleeve, and a clutch memberon said shaft to engage that (on the spindle. v

scribed-, a 'rotatable turret. a-plurality of worlrspindles in said-turret, a ,plurality of drivinggshafts in alignment with the spindles-complementary clutchmembers on the yopposed ends of the shafts and spindles. a plurality of sleeves in each of whichV a driving shaft is mounted, Y said sleeves being slidable longitudinally to connect 'and'disconnect said clutch members and provided with shoulders` afslidable member having' 'a'v iiange to engage 'said'shoulders to'shift the sleeves to disconnectv the clutches. "springs ,to shift 'the sleeves to engage the'clutchesmnd automatic means for 4shifting the slidable member. f f A letIn a machine ofthe character de- Ascribed, aframe. a rotatable turret rinthe frame. work spindles in the turret, aV plurality of driving .spindles in alignment with the vwork spindles, supporting bearing sleeves for the` driving spindles mountedr Vto slide f' longitudinally in the frame, complementary rclutch members on vthe work and' driving spindles. springs tending to shift the sleeves toward the ywork spindles,` lugs on vsaid sleeves a slidable member having a flange to engage said lugs. a lever for slidingfsaid member. a'ccntrol shaft. means operatedby saidshaftto shift said lever and indexing mea-ns forlA the turret controlled b v said shaft. .15.,In a .machine of the character described, a main drive shaft, a main feed shaft including two aligned` sections, al driving connection between lthe drive shaftand one nally toward and from the spindle, means on Ythe sleeve to prevent it turning in the frame. Y

vof said sections, a disconnectable clutch drive between the two sectionsa reducing driving connection between the two sections, a driven shaft, and a driving connection from the secondsection to the driven shaft.

scribed, a main drive shaft, a main feed shaft Yincluding two aligned sections, a driving connection between the drive shaft and one of said sections, a disconnectable clutch drivebetweenl the two sections, a reducing driving connectionbetweenthe two sections includywork spindles, aY driving connectionfrom said shaft to said spindles including a`releasarble .clutch,;a shaft comprising a pan' of .aligned sections,: a clutch drive between the two sections, a vdriving' connection from the main shaft to one of'said Sections, a control shaft, a drivingfk connection from the second section to thecontrol shaft, a .reducing drivfing :connection between the two sections including a one waydriving means, andv means controlledby. the control shaft for controll Vling saidclutches. l l13. In a machine of the character de- 18. In a machine of the i character described, a main drive shaft, a control shaft, a driving connection between the vtwo shafts 'including a clutch having a shiftable member splined to said shaft, a clutch member 'on one side of'theslidable 'memberxdriven by the main drive and adapted to be engaged ybyr the slidable member, a gear on the other side of lthe ,slidable member, releasable coi operating driving clutch meanson said gear and the slidable member,v a manually operated'me'ans for driving'the gear, and means for shifting the sliding member to engage either clutch,

20. In a machine of the character described. a frame, arotatable turret mounted .in the frame, a plurality of work spindles in said turret, an .indexing arm mounted to rotate ina single plane, a roller carried on said arm to engage said-spindles 1n succession to vturn the turret with a step by stepk movement.:l

21. In a machine of the character described, a rotatable turret, a plurality of worlr spindles mounted in the turret having exposed portions, an indexing mechanism including a rotating member mounted to roshaft for controlling the Y() 16. In `a machine of the characterde'- tate in one direction only, an arm carried by said rotating member, and a roller carried by the arm in position to engage said exposed portions in succession to index the turret with a step by step movement.

22. In a machine of the character described, a rotatable turret, a plurality of Work spindles mounted in said turret and projecting from one end thereof, means for locking the turret in different positions, an indexing mechanism including a rotating member,` an arm carried by said rotating member, a roller on the arm to engage said projecting portions in succession to rotate the turret with a step by step movement, said arm being so proportioned as to cooperate with the next projective portion to position the turret in the succeeding position, and means for operating the arm and the locking means in timed relation.

In testimony whereof I affix my signature.

ARTHUR J. LEWIS.

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