US2438508A - Multiple spindle chucking machine - Google Patents

Description

March 30, 1948. A gw s 2,438,508

*MULTIPLE SPINDLE CHUCKING MACHINE Filed Nov. 18, 1942 16 Sheets-Sheet 1 Maj-ch 30, 1948. A. J. LEWIS ,5

' MULTIPLE SPINDLE GHUCKING MACHINE Filed Nov. 18, 1942 16 Sheets-Sheet 2 MXXQ LV March 30, 1948. A, J. LEWIS 2,438,508

' MULTIPLE SPINDLE CHUCKING MACHINE Filed Nov. 18, 1942 16 Sheets-Sheet 5 March 30, 1948. J, zw s MULTIPLE SPINDLE cnucxme MACHINE l6 Sheets-Sheet 4 Filed Nov. 18, 1942 q ull! A. J. LEWIS March 30, 1948.

MULTIPLE SPINDLE CHUCKING MACHINE Filed Nov. 18, 1942 16 Sheets-Sheet 6 March 30, 1948. J, w s 2,438,508

MULTIPLE SPINDLE CHUCKING MACHINE Filed Nov. 18, 1942 16 Sheets-Sheet '7 COND\T\ON O SHELL. AT LOADHQG TURN\ NG OOL.

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MULTIPLE SPINDLE GHUCKING MACHINE Fi'led Nov. 18, 1942 16 Sheets-She et 8 March 30, 1948. A. J. LEWIS MULTIPLE SPINDLE CHUCKING MACHINE.

Filed Nov. 18, 1942 16 Sheets-Sheet 9 March 30, 1948. A. 'J. LEWIS.

- MULTIPLE SPINDLE CHUCKING MACHINE Filed Nbv. 18, 1942 16 Sheets-Sheet l0 A. J. LEWIS March 30, 1948.

MULTIPLE SPINDLE CHUCKING MACHINE Filed Nov. 18, 1942 16 Sheets-Sheet ll March 30, 1948- A. J. LEWIS MULTIPLE SPINDLE CHUCKING MACHINE Filed Nov. 18, 1942 16 Sheets-Sheet l2 A. J. LEWIS March 30, 1948.

MULTIPLE SPINDLE CHUCKING MACHINE 1s Sheets-Sheet 15 Filed Nov. 18, 1942 March 30, 1948. A. J. LEWIS- MULTIPLEJSPINDLE CHUCKING MACHINE Filed Nov. 18, 19 42 16 Sheets-Sheet 14 "w w a H T o 6 5 m 4 3;. T M. Z m 6 2 w mco up M 7 M a 1 a.

lies "JVERTICAL OF-MACHINE- March 30, 1948. A. J. LEWIS MULTIPLE SPINDLE CHUCKING MACHINE 1e Shets-Sheet 15 Filed NOV. 18, 1942 MN mm ZOEIOZ k0 Ih lw ITRJHHING TOOL BACK March 30, 1943.

A. J. LEWIS MULTIPLE SPINDLE CHUCKING MACHINE Filed Nov. 18, 1942 NO BELT CONTACT REAMER IN BACK POSITION DRILL m BACK CARRIER IN LOAD POSITION COLLET' RELEAS D comer RELEASE CARRIER SWINGS Tu FACING TOOL RETURN C'OUNTERBORE di REAM RETURN CARRIER IN REAM POSITION DWELL FACING TOOL FEED OUT COUNTE RBUEE' LOOKING TOWARD ozkecflou 0F Roimon:

OF TURR E T AN 0 FRONT OF TU CARRIER SWINGS TO DRILL POSITION /9 vzancm. t MACHINE coujr GRIP ma CARRIER IN DRILL POSITIO r TOOLS DRILL "RETURN CARRIE? SWINGS APPROACH I AGING TOOL FEEDS IN I I VERTICA\ Q MACHINE I E I I 16 Sheets-Sheet l6 QUICK REI'URN TRIMMI NG TOOL EETLlRNs R R d. couNTERBozE Patented Mar. 30, 1948 MULTIPLE SPINDLE CHUCKING MACHINE Arthur J. Lewis, Stratford, Conn., assignor to The Baird Machine Company, Stratford, Conn, a corporation of Connecticut Application November 18, 1942, Serial No. 466,011

51 Claims (01. 29- 38) This invention relates to a multiple spindle chucking machine, and has for an object to provide a machine in which machining operations may be performed on both ends of a work piece, as for example a cartridge shell or casing, in a single chucking operation.

Another object is to provide a construction in which the various operations are performed during one revolution of the turret carrying a plurality of work spindles, so that although several work pieces are operated upon and finished during each revolution of the turret the operations for a single piece require a greater part of a single revolution of the turret, and thus the cutting, turning, drilling, or other operations may be performed at the desired lower speeds to secure best operation and maximum life of the tools.

Another object is to provide a construction in which the number of different operations are automatically performed in certain timed relation with each other during the revolution of the turret.

A further object is to provide a construction in which the operations are so performed that the turret may be rotated continuously and operated at a sufliciently low speed to permit loading and unloading of the work carrier or the chucks while the turret is rotating, doing away with the necessity of stopping and starting the turret for loading and unloading each work piece, eliminating indexing operations and consequent necessary indexing mechanism, and materially increasing production.

A further object is to provide a construction in which the work piece is automatically properly located in the chuck prior to closing or gripping of the chuck, and after the operations have been completed the chuck is automatically opened or released and the work piece is ejected or shifted to a position where it may be readily grasped by the operator and removed.

A still further object is to provide a construction in which there is a constantly rotating turret in which is mounted a plurality of workcarrying spindles, and in which the spindles are continuously rotated during the working operations and during a greater part of the rotation of the turret, and are stopped only for the removal of the finished work piece from and the insertion of an unfinished piece in the chuck.

Another object is to provide a construction in which a number of diiierent types of operations may be performed on the work piece during a cycle or a single revolution of the turret.

Still another object is to provide a construction in which a plurality of operations are performed on a work piece which may require a plurality of difierent tools carried by different carriers, and in which one carrier may be automatically advanced to the working position and the tool fed for the working operation while the other carrier is locked in the retracted or inoperative position, and after the work of the tool or tools on this first carrier is completed it is automatically shifted to the retracted or inoperative position and locked while the second carrier is automatically unlocked and advanced and its tool or tools fed for their work operations.

With the foregoing and other objects in view I have devised the construction illustrated in the accompanying drawings forming a part of this specification. It is, however, to be understood the machine is not limited to the specific construction and arrangement shown, but that various changes and modifications may be employed within the scope of the invention.

In these drawings:

Fig. l is a top plan view of the machine;

Fig. 2 is a rear elevation;

Fig. 3 is an end elevation looking toward the right end of the machine or the top of Fig. 1;

Fig. 4 is a vertical section through the left-hand end of the machine andthrough one work spindle in the uppermost position, which is the position just after the work piece has been inserted in the chuck and just before the chuck closes, the centralshaft being shown in elevation;

Fig. 5 is a section through the same spindle on a somewhat enlarged scale and showing a slight modification of the chuck and the trimming tool and with the chuck closed preparatory to starting of the operations on an unfinished work piece;

-Fig. 6 is a section of the mounting and the drive for the trimming tool, it being a continuation of Fig, 5 toward the left;

Fig. 7 is a vertical section through the upper part of the right-hand end of the machine, showing the mounting and operating mechanism for the tools operating on the outer end of the work piece, the right-hand portion of the central shaft being shown in elevation;

Fig. 8 shows a work piece in a series of sectional views, together with the various tools shown diagrammatically in elevation, to indicate by way of example a number of operations which may be performed on this machine, and the sequence of these opertions;

Fig. 9 is a top plan view of a portion of the mechanism for operating the trimming and knockout devices;

Fig. '10 is a transverse section thereof, substantially on the line Ill-l of Fig. 9;

Fig. 11 is a transverse section immediately in front of the outer ends of the work spindle, show- 1 ing various turning and finishing tools in different positions throughout the revolution of the turret, the section being substantially on line ll of Fig.7;

Fig. 12 is a transverse section showing the operating means for the tools of Fig. 11, the section being on line l2 of Fig. 7, and in some of the positions the collet or chuck release lever being omitted;

IS, in which turret is mounted a plurality of work-carrying spindles 20, in the present case there being five of these spindles. These are hollow spindles rotating in suitable antifriction bearings 2| and 22 in the turret. Each spindle is driven or rotated by a grooved pulley '23 mounted on'the spindle, this pulley being driven by a se- Fig. 13 is a side elevation of the cam operated lever for the collet or chuck release which is carried by each of the tool-operating levers of Fig. 16 is a vertical transverse section showing the means for swinging the tool carriers of Figs. 14 and 15 to the difierent angular positions, and

showing them in'the positions corresponding to Figs. 14 and 15, the section being substantially on line N5 of Fig.7;

Fig. 17 is a transverse section through a work spindle just back of the forward bearing and showing the lever for operating the collet or chuck release, the section being substantially on line H--|l of Fig. 5; a

Fig. 18 is a development of the trimming and knockout cam;

Fig. 19 is a partial side elevation and partial section of a portion of the cam of-Fig. 18, the section being substantially on line Iii-l9 of Fig. 18;

Fig. 20 is a plan view of a development of the feed cam for the tools operated by the mechanisms of Figs. 14, 15 and 16;

Fig. 21 is a development of the collet or clutch, release cam;

Fig. 22 is a. work diagram showing the various operations of the machine illustrated and their relative timing with respect to each other;

Fig. 23 is a partial section and partial elevation of a device for automatically locating a work piece in proper position in the chuck, and

Fig. 24 is an elevation looking from the right of Fig. 23.

7 General arrangement The machine comprises a frame Or base I and a central main shaft 2 mounted to rotate in suitable bearings 3 and 4 in left and right hand end housings 5 and 6 respectively, mounted on the base 1. The left hand end housing. 5 also provides a housing for the main drive for the central shaft 2. This drive comprises a, wormgear'lse- V cured to the shaft 2 by any suitable means,.such for exampl as screws 8, and meshes with a worm 9 mounted on a shaft 10 in the upper part of the housing 5 operated by a drive pulley 'l I "through belts l2'running from. one ormore grooved pulleys 13 on the armature, shaft of the motor l4, mounted on the housing 5. In the present .case the end of the housingis coveredandj'enclos'ed ries of V-belts 24 through a grooved pulley 25 on the armature shaft of an electric motor 26 '(Figs.; 1,2 and'3). These belts also run'over an idler pulley '21 which lifts the belts from the spindle pulleys 23 during a portion of their movement with the rotating'turret, to permitstopping 'of'the spindles for the unloading and loading op erations,as will later be more fully described. The motor'is mounted on a bracket 28, and the idler pulley '21 is mounted on a bracket29 (Figs. 3 and 11) pivoted to bracket 28 at 30. A spring 3| on a rod '32 tends to swing the pulley 21 outwardly or to the left as shown in Figs. 3 and 11, to keep the belts 24 taut and at the proper tension, as well as to carry them away from the spindle pulleys 23 at the proper time.

Also mounted on the main shaft 2 to rotate therewith is a housing 33 (Figs, 1, 2, 4 and 6) carrying the trimming tools 34 :and 34a (Figs. 4, 5 and 8) and the slide 35 therefor, there being one of these tools inalignment with each work spindle" 20 to the rearof the turret and the work I spindles carried thereby.

At the opposite and forward side of the turret 7 l9 and the-work spindles is a barrel 35*(Figs. 1, 2 and '7) also'mounted on the main shaft 2 to rotate therewith, and this .barrel carries a number of different tools mounted and operated to 'bebrough't into position to perform various operations on the work piece carried by the indi: vidual work spindles, there being one set of these tools for each spindle carriedwaround with the spindle "as the turret rotates, so that these work operations are performed during the rotating movement of the turret, as will be more fully described later. Thus,.the main shaft 2' through its rotation rotates the turret 19 carrying with-it the work spindles, and the-tools carried by the ho'using33 for performing certainoperations on one end -of 'the work piece also rotate "with the shaft 2 and therefore the turret l9, and the barrel EB- carryingthe tools for performing the 'work operations on the other end of the work piece also'rotate' with the shait'2 and the turret. The

turret can therefore be rotated continuouslyv through rotation of "themain central'shaft '2, and as the various tools arealso mounted on this shaft and rotate with it they are carried around with the turret and the-work -spindles,

so that all the various operations on the work.

7 various tools. It is therefore possible to operate by a cap l5, and the motor 14' ismounted'ona on the workpieces during thegreater part of a singlerevolution of theturret, thus making available all the timefre'quired for this portion of th'e revolution of 'thefturret for performing the various operations on the work" piece, permitting these operations "to baperfbrmedjat lower and more appropriate speeds; and assuring longer life to the tools. As there are a plurality of spindles on the turret and therefore the various operations are being performed on a number of different work pieces simultaneously, a work piece is finished on each spindle during each revolution of the turret, thus greatly increasing production without increasing operative speeds on the work piece.

Work: carrying spindles As indicated. above, the work-carrying spindles Zil (Figs. 4 and 5) are hollow spindles mounted to rotate in suitable bearings 2i and 22 in the turret it carried by the main shaft 2. Any de sired number of spindles may be mounted in the turret (in the present case five are shown) and all the spindles are alike. Mounted within each spindle is a work-holding chuck comprising a collet 3? having jaws 38 to grip the work piece, in the present case a cartridge shell or casing 32 or 3%. The outer surfaces of these jaws are tapered, as indicated at All, to cooperate with a similar taper t! on the inner side of a sleeve E2, slidable longitudinally within the spindle. The collet is secured at its inner end in the body portion of a sleeve 5 .3, it being threaded into the sleeve, as shown at 4 This sleeve has a flange d5 seated against the rear wall of the web of the puliey 23, and the spindle '29 is threaded into the hub of this pulley, as indicated at 56.

The sleeve 32 is slidable longitudinally within the spindle 20 to clamp and release the chuck jaws of the collet 3i, the clamping being effected by taper M on the inner side of the sleeve having a carnming action on the taper 48 on the jaws, the collet 3i being slit longitudinally between the jaws to permit the jaws to move inwardly and outwardly. The jaws tend to move outwardly through spring action of the shanks or connecting portions il of the collet, which are integral with the opposite continuous end portion 38 of the collet. A series of springs 89 are mounted in the recessed rear side of the pulley 23, each being anchored at its outer end by a pin 5E9 (Fig. l) in the web of the pulley and a clamp ring 5i secured to the pulley flange by suitable screws (not shown). The inner free ends of the springs are each located in a radially extending recess or notch 52 in the flange 45 and press against a longitudinally slidable pin 53 mounted in the sleeve 53. These pins 53 rest at their opposite ends against the end of the sleeve d2 whereby the springs d9 tend to shift the sleeve 32 to the right as viewedin Figs. 4 and 5, and thus through the camming action of the tapers 3H and ll, serve to clamp the chuck jaws 33 against the work piece 39 or 39a.

The sleeve '52 may be shifted to the left or in the opposite direction to release, these jaws and thus release the work through action of a series of pins 53 seated at their reduced inner ends in sockets in the sleeve 52 and carried by a ring 55 slidable longitudinally on the outer side of the spindle 2E3. Pins 5 pass through elongated slots 5%) in the spindle so that the sleeve and pins may move relatively to the spindle. Embracing the ring 55 is a collar 57 which abuts at its rear edge against the shoulder 58 on the ring 55 so as to shift this ring to the left on shifting movement of the collar. The collar 51 does not rotate but the ring 55 rotates in this collar with the spindle. As shown in Fig. 1'7, the collar has recesses 59 in its opposite sides in which are seated lugs til on a U-shaped lever 6| pivotally supported on pivot pins 62 mounted in the turret ill. The lever is engaged at its lower end by a collet or chuck release rod 63 (Figs. 4, 5 and 7), operated by suitable mechanism in certain timed relation with the work unloading and loading operations, as will later be more fully described. Suitable seals 66 may be provided at opposite ends of the spindle to retain the lubricant in the turret for the spindle bearings.

It will be seen from Figs. 4 and 5 that the inner end portion 48 of the collet forms a supporting means for the inner end portion of the work piece 39 or 39a, in the present case the shell or casing, and thus supports this end of the work piece properly concentric with the axis of rotation, the outer end being similarly supported and positioned by the collet or chuck jaws 33. For the shorter shell 39, as shown in Fig. 5, this portion 48 of the collet embraces the reduced portion 65, while in Fig. 4 where a longer work piece or shell is being operated upon it embraces and supports the body portion of the shell and an additional end support 66 is provided carried in a cap 67 mounted in the sleeve 43 so as to rotate with the spindle. In the holder for the shorter work piece of Fig. 5, the support 66 is omitted and the cap 68 has an enlarged opening therethrough to permit entrance of the trimming tool 36a for trimming the end of the work piece. If desired, a belt guard 69 may be mounted on the turret.

In the present machine a trimming operation is performed on the inner or left hand end of the work piece, that is the shell casing 39 or 3%, but it will be understood that with different work pieces difierent operations may be performed. The trimming tool is shown at 34 (Fig. 4) for the longer shell 39a, and the similar tool 34a (Fig. 5) for the shorter shell 39. The tool 34 is mounted on a tool holder 10, while the tool 34a is mounted in a similar holder H, but this latter holder is extended and made longer so as to carry the tool Ma further into the spindle to engage the shorter work piece 39. The holder 70 and H is carried by a tubular slide 35 mounted to slide longitudinally in suitable bearings 12 and F3 in the housing 33 mounted on the shaft 2, so that this housing turns With the turret and maintains the trimming tool carriers in alignment with the respective spindles, it being understood there is'a tool slide 35 for each spindle. Means for shifting this tool slide to carry the tool to and. from the working position and feed it forwardly during the working operation is shown in Figs. 4, 6, 9 and 10. Mounted on the tube 35 forming the slide is a block 14 forming a carrier for a catch lever 15. The block is clamped to the slide 35 by any suitable means, in the present case it being split at E6 and clamped by a screw ll. This block or carrier includes an extension 78 carrying a bearing 79 slidable on a guide pin 89 mounted in the housing 33. This guide pin prevents the block or carrier from turning and therefore prevents the slide 35 from turning under action of the tool carried by it. Relative turning movement between the slide 35 and block or carrier 14 is prevented by clamping of the carrier on the slide. Mounted on the block 74 is an adjusting screw 8| having a cylindrical head seating in a notch 82 in one side of the slide 35. By loosening the screw l1 and adjusting the screw 8! the position of slide 35 in the carrier M can be adjusted, and then clamped in the adjusted position by tightening the screw 11.

Mounted on the lower side of the carrier 14 is nee -cos "ai roller' tt =running-ln a cam groove inn cam 6:4 mounted on the end housing-'5. A development of this cam is-shown in "Fig. i8-a ndthe-cycle of operations controlled by this cam and their relation to the other operationsof the machine-1s shown by the outer circle Ma of'Fig. --22. The catchllever l5 carries-a roller 85 running on the outer cylindrical surface of the cam '85:, but this surface is provided with a recess-883 extending throughout a certain portion of the periphery of this cam'to -permit the 5roller'85 to drop into-it at a certain given time and permit 'the'other end 8? of the catch lever, which'is located in an opening '83 in the s1id'e"35, 'to enter an annular groove 89 in a work ejector or knockout tube 90, to 'thuslock the block or carrier 14 to this tube '90 so'that the tube at this time-willmove with the-carrier. The opening '88 is an elongated opening, permitting relative movemenubetween the carrier :and the slide in adjustingthe positionof the slide in the carrier. The catch lever 15 is-pivoted to the carrier by the pin 15a,

7 and the roller '85 is pressed against the cam 34 by a spring 751) mounted on the carrier.

'lviounted in the housing-33 at the'forward side of the carrier His a bumper pin 91 projecting intothe path of movement of the carrier and held in this position We bumper spring'92; this 'pin being slidable inthe housing and forming a spring bumper to assist in arresting -'forward movement of the carrier and associated parts on the :ejector or knockout operation of the work piece, as will later be more fully described. The shank 93 of thepin' is slidable in a'plate 94 mounted in the 'housingandforming a, stop for the nut '85 mounted on the shank tolimit inwardmovement-of the in 9i, and this plate 9B alsoforms an abutment for the spring 92. i

The ejector or knockout tube 88 :is mounted within the slide 35, and the slide '35 may move relative to the tube 9!! for feeding operations of the tools 34 and 34a,:in the present :case trimming tools for the inner or open end otthe shell 39 or 39a. The tool carrier 70 or "il is mo'unted in the endo-f the slide '35, in the present instance it i being threaded into the :slidepas indicated at 96.

The knockout tube '93 is of reduced diameter for the greater portion of its length, 'as indicated at 9%, and the tool holder 19 (or 11') is guided on this reduced portion. This forms a shoulder .9! on the tube spaced from and opposed to the inner end'of the holder 18 or H. A spring-QB-embraces this reduced portionand abuts at its opposite ends against the shoulder 91 and the holder 1-9 or 1 i; thus tending'to shift the tube 99 to the left as viewed in Figs. '4, 5 and 6, and normallyholds its inner end against an adjustable :stop '99 mounted on the housing .ts by means of a cap lei]. Rather than have the end otthetube til directly engage the stop,'it is preferredto mount a stop plug iiH-in the end of the tube toengage the stop. his plug also forms abearing for a stop, rod 592 running throughout the length of the tube 98. The reduced portion 99a of tube 6!) a is also supported in thetool holder" is or i i;

The reduced portion 98a of the. knockout tube t ll er'tendsinto the Work spindle and within.

the collet orchuck 3! at its inner end, and carries a bearing retainer I 03 (Fig. 5) having a shank ii! telescoping in the tube- 'Carried by this memberiilS is a work locator 105 mountedto rotate in the an anti-friction hear ing' I55. This work locatoris retained in the member Hi3 :by, ,..key pi m1 extending at its inner end into an annulargroove a! 08 inthe .shank 77 of the-"iocator. This locator is also locked 'tothe stop rod Hi2 by a transverse lock pin- Hi9 having a keyhole shaped opening I 10 to permitpa'ssage of the head Hi and lock'the applicator 'to the rod 'by'th-e reduced neck portion I I2. This 'neck portion, however, is'lo'nger than the thickness of the central portion of the pin llm so as to permit a certain amount of relative movement between the locator and the rod. The free endof the locator is adapted to seat. against'the inner Surface of t'he'en'd wall :of the workpiece 39, as indicated in Fig.5, to limit the inward movement of the 'work piece into the chuck andproperly locate it in the desired position therein, and it also 'acts as an ejector-or knockout means'for shifting the finished work .piece forwardly in the chuck to a position where it may be readily grasped and're-- moved fromthe chuck. A spring H3 embraces I the Prod H32 and by reaction on the sleeve H4 keyed to :the member-9M and theinner end of 7 shank Wfi 'tends to move the member 163 and the locator Hi5 outwardly, this movement being limited by thetsplit collar-265 (Fig. 6) in an annular Tools ope'manm the outer end oflthe work piece As a number of different operations are performed on the outer head of thework 'piece, in

the present case a smaller casing 39 or. 39a, there.

are "a plurality of tool carriers. and operating mechanisms associated with each work spindle, which are carried. by the barrel 36 mounted on the shaft 2 so to rotate withthis shaft and the turret. machine is tooled to turn a groove in the outer surface of the shell to form the flange H1 and the groove I i 8 immediately back of it, to 'face'ofi the end of the shell, to form a *groovel IS in the end -face,".and..to drill, ream, counterbore and countersink a central "opening in the 'end of the -shell,'as indicated b-y the drill 128 in Fig. 8b and the reaming, 'counterboring and coun'tersinking tool'lzi in Fig. 8c.

The tools .forturning and finishing'the outer surfaces Hi, iiit'a'ndfacing 'theend of the shell are carried by a, tool 'holderl22 (Figs. 7 and 11) moun'tedaon -a tool bar 1:23. Thi-s'bar is mounted torockinthe barrel 3% and has a'reduced exten- :sion1i24 (Figs. '5 and 7') at 'its inner end mounted in a bearing :lie'in the turret '59; The bar I23 is mounted in a tube or sleeve I25 mounted in suitablebearings l2'l'and 128 in'the barrel .Bearing bushings ltd are provided for supporting the bar 123 in the tube -G26 to permit turning movement-sot the bar within the tube. Similar ibearing bushings are provided for the tubeil 26 in the bearings .izland 23 to permit this tube i25't0 turn in these bearings and thus turn relative to the barrel. The 'tool holder 122 is keyed to the 5.23 so that by rocking this bar the various tools carried by this holder are shifted to and from the work piece and areproperly fed during the cutting operations, The various tools'carried by this holder arewindicated somewhat diagram :inatically in Fig. 1'1, :and their various positions throughout the cycle of work operations for each work-piece and throughout one revolution of the turret 'are'al'so indicated in this figure- 'These As indicated in Fig. '8 the present

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