Патент USA US2117917код для вставки
May 17, 1938- 1 H. A. SILVEN ' 2,117,917 ~ AUTOMATIC GRINDING MACHINE Filed Oct. 4, 1957 79 218 > ' 175 I 276 -. Z] 223 221 218 FIE-7.11 22 ' . 2 228 3 4/ 4/7 12’ [34.340 I 3 f [3 222~ I ail-7E‘ i 6 sheets-Sheet 1 2/3 May 17, 1938. Y H.111. SILVEN 2,117,917 AUTOMATIC GRINDING MACHINE Filed Oct. 4, 1937 6 Sheets-Sheet 2 7 FIG. 2 5 36 II V 00 33] 32 319 5 ‘374 70 72 3 23635 Dame/M101,‘ HERBERT A. SILVEN WU.W WWW May 17, 1938. H. A.‘ SILVEN‘ - 2,117,917 AUTOMATiC GRINDING MACHINE Filed Oct. 4, 1957 6 Sheets-Sheet 3  15/8163 3m May 17,1938. 2,117,917 1-1. A. SILVEN AUTOMATIC GRINDING MACHINE Filed Oct. 4, 1937 6 Sheets-Sheet 5 m, vmmwm _._5N Nhmw 9%“3w\ W 3m. QM».HIN-.1. . m.. r“Q \ mum a.‘ \[wm o.26 , 9v“R0 soOhmwoExvw Em E1 mm W H L1IKl NR,m L W mt E‘E \\ 1, .DR. .Lvwm -. 1 A U M ,hvw9m N . 3I. 5. v v Patented May 17, 1938 - 2,117,917 v UNITED STATES PATENT OFFICE 2,117,917‘ AUTOMATIC GRINDING MACHINE Herbert A. Silven, Worcester, Mass., assignor to Norton Company, Worcester, Mass, a corpora- ' tion of Massachusetts > Application October 4, 1937, Serial No. 167,131 1'! Claims. (Cl. 51--105)_ This invention relates to grinding machines, and more particularly to a full automatic grind- ing machine for grinding cylindrical work pieces. One object of the invention is to provide a sim5. ple, thoroughly practical, improved full automatic Fig. 1 is a front elevation of a grinding ma chine embodying this invention; ' tion is to provide a hydraulically actuated full automatic grinding machine in which the various Fig. 2 is a piping and electrical diagram show ing the electrical and ?uid pressure connections between the various units and control valves; 5 Fig. 3 is a left hand end view of the left-hand work head, taken approximately on the line 3--3 of Fig. 1, on an enlarged scale, with the motor re mechanisms are provided with safety interlocks. moved; full automatic hydraulically operated ‘cylindrical both of the work heads, taken approximately on grinding machine in which the various hydraulic control units are electrically interlocked. An- the line 4-4 of Fig. 3; » Fig. 5 is a cross sectional view, on an enlarged other object of the invention is to provide an scale, through the work feeding and discharging grinding machine. Another object of the inven- 10 A further object of the invention is to provide a 15 automatic work loading mechanism or carrier which is provided with a plurality of work re- ceiving pockets simultaneously to grip the ground Fig. 4'is a horizontal sectional view through 10 mechanism, taken approximately on the line 5-5 15 of Fig. 1, showing the work carrier in position during the grinding operation; piece of work and a new piece of work and auto- Fig. 6 is a similar view, showing the work car ,matically and simultaneously to shift the ground rier moved‘forward to grip a new work piece and 20 piece of work to a discharge chute and the new piece of work into alignment with the work supporting spindles. . the work piece which has been ?nish ground; 20 Fig. '7 is a similar sectional view through the work loading mechanism, showing the work car A further object of the invention is to ‘provide rier tipped to swing the ground piece of work into a discharge position and simultaneously to carry a new piece of work into alignment with the work 25 spindles; Fig. 8 is a similar cross sectional view through the work'loading mechanism showing the work carrier withdrawn to discharge a ground work piece in the discharge chute after the spindles 30 ‘have gripped the. work piece; . a work loading device in which a work carrying 25 head or member is moved horizontally into posi‘tion to grip a ground piece of work supported on the driving spindles and a new piece of work supported in a hopper and simultaneously to rock the carrier to transfer the ground piece of work 30 to a discharge position while the new piece of‘ work is transferred from the hopper into align- ment with the work supporting member. A further object of the invention is to provide a hy- draulically actuated work loading mechanism in 35 which the work carrying element is hydraulically moved ?rst ina horizontal direction to grip a Fig. 9»is a detail view,,0_n an enlarged scale, of the ‘cycle trip SWltch; , . 1 ‘ Flg. 10 1s a fragmentary cross Sectional-View, on an enlarged scale, taken approximatelvon the so line III-l9 0f Flg- 1; ‘ ground piece of work and a new pieceof work and then is hydraulically rocked to swing the car- Fig- 11 is a fragmentary longitudinal ‘section. on an enlarged scale, taken approximately. on the rier and thereby simultaneously to transfer the line ||--|| of Fig- 5; 40 ground piece of work from the spindles to a discharge position and the new piece of work from the hopper into alignment with the work support _ _ Fig- 12 is a cross Sectional View, taken aDDITOKF 4o mately on the line l2--l2>0f Fig. 11; Fig. 13 is a fragmentary cross sectional view, taken approximately on the line I 3-13 of Fig. 11; ingjtfgzyléfjrséts will be in part obvious or in part . Fig. 14 is a fragmentary cross sectional view, . taken approximately on the line M—-i4 of Fig. 5; 45 mime‘? °ut hereinafter: . . . The invention accordingly consists in the fea- Fig. 15 is a right-hand end elevation of the right_hand work head on an enlarged scale tures of construction, combinations of elements, taken approximately on'the line |5___|5 of Fig 1;’ and arrangements of parts-1 as will be exempli?ed 50 in the ‘structure to be hereinafter described, and the scope of the application of which will be indi- cated in the following clalmsIn the HCCOmDaHYiHg drawings in Which is shown one of various possible embodiments of 55 the mechanical features of this invention, Fig. 16 is a rear view of the work loading mech anism, taken ‘approximately on the line |6_|6 of 50 Fig 5; and " _ Fig. 17 is a horizontal sectional view, taken ap proximately on the line i‘I-JT of Fig. 16. A full automatic grinding machine has been illustrated in the drawings comprising a base 20 55 2 2,117,917 which supports a longitudinally adjustable table 2| on the usual flat way 22 and V ‘way 23. To facilitate longitudinal adjustment of the table 2| relative to the base 26, the table 2| is provided with a depending rack bar 24 which meshes with a gear 25 (Figs. 1 and 10) mounted on the inner end of a rotatable shaft 26 which is journaled in a bearing 21 ?xedly supported on the base 20. The outer end of-the shaft 26 is provided with a 10 squared-off portion 28 which is adapted to be en gaged by a removable lever 29 so that the table may be adjusted longitudinally in setting-up the machine for a given operation. The base 20 also supports a transversely mov 15 able grinding wheel slide 32 which is supported on the usual V and ?at ways to permit a transverse adjustment of the slide relative to the base. The slide 32 supports a rotatable wheel spindle 33 which in turn supports a rotatable grinding wheel 20 34. The grinding wheel spindle 33 may be ro tated in any convenient manner such as, for ex ample an overhead drive or a motor drive, such as an electric motor 35 mounted on the upper surface of the wheel slide 32. The motor 35 is provided with a driving pulley 36 which is pref erably of a multiple V groove type and is arranged to transmit power by means of multiple V belts 31 to a multiple V groove pulley 38 mounted on the end of the wheel spindle 33 to rotate the 30 grinding wheel 34 for a grinding operation. The wheel slide 32 isarranged for a transverse feeding movement either manually for adjust ment or setting-up of the machine, or auto matically during the automatic cycle of opera The wheel slide 32 is provided with 35 tion thereof. a depending half nut 46 which meshes with or engages a rotatable feed screw 4| journaled in a slidably mounted bearing 42 at one end and a bearing (not shown) at the other end. The for 40. ward end of the feed screw 4| is slidably keyed by means of a sleeve to the inner end of a rotat able shaft 43. The shaft 43 projects from the front of the machine base and is provided on its outer end with a gear 44 which meshes with a 45 gear 45 supported on a shaft 46. A manually operable feed wheel 41 is also supported on the shaft 46 and is either formed integral with or ?xedly mounted on the gear 45 so that rotation of the manually operable feed wheel 41 is transmit 50 ted through the gear 45 and the-gear 44 to rotate the shaft 43 and thereby rotate the feed screw 4| in either direction to adjust the position of the wheel slide 32 as desired. A pivotally mounted stop pawl 48 supported by 55 a stud 49 is arranged to engage an abutment (not shown) positively to limit the infeed adjust ment by the feed wheel 41. Associated with the feed wheel 41 is a micrometer adjusting mecha nism 59 by means of which the abutment carried 60 thereby may be precisely adjusted relatively to the feed wheel 41. This feed mechanism has not been illustrated in detail since it is not considered part of the present invention. For a more de tailed disclosure of this feed mechanism, refer 65 ence may be had to the expired United States patent to Norton No. 762,838 dated June 14, 1904 which discloses substantially the same type of feeding mechanism. '70 ' In order that the wheel slide 32 may be moyed rapidly toward the work piece to grind the same automatically bythe plunge-cut method, the feed screw 4| is connected through the bearing 42 with a piston rod 55. A ?uid pressure cylinder 53 is arranged in axial alignment with the feed screw 4| and contains a slidably mounted piston 54 which is connected with the piston rod 55. A ?uid pressure pump 59 which , is driven by an electric motor or other suitable power drive serves to pump ?uid through a pipe 60 from a reservoir 6| within the base 28. The pump 59 forces fluid under pressure through a pipe 62 to a main control or feed control valve 58. The main control valve 58 is'preferably of a piston type comprising a valve stem 63 and a plurality of spaced pistons which form valve chambers 64, 65 and 66 therebetween. In the position of the‘ valve 58 (Fig. 2), fluid under pressure enters the valve chamber 65 and passes out through a passage 61 into a cylinder chamber 51 to cause the piston 54 to move rapidly toward the left (Fig. 2) 'to cause an infeeding movement of the wheel slide 32 and the grinding wheel 34. During the passage of ?uid under pressure into the cylinder chamber 51, ?uid is exhausted from a cylinder chamber 56, through a passage 68, into 20 the valve chamber 66, and out through a pipe 69 which exhausts into the reservoir 6|. The valve stem 63 is held in a forward feeding position (Fig. 2) by means of an electric solenoid 15 which is connected by a link 16 and a stud 11 to the lower end of a pivotally mounted lever 18 supported on a stud 19. The upper end of the lever 18 is connected by a pin or. stud 80 with a spool shaped member 8| mounted on the outer end of the valve stem 63. When the solenoid 15 30 is energized, the valve 58 is held in position illus trated in Fig.2. When the solenoid 15 is deen--v ergized, the released compression ‘of a spring 82 within the end of the valve casing serves to move the valve 58 quickly toward the right (Fig. 2) to - reverse the position of the valve and to reverse the ?ow of ?uid to and from the chambers 56 and 51 of the cylinder 53. The electrical apparatus for controlling the solenoid 15 will be described hereinafter. ~ Dash pot The piston 54 and cylinder 53 mechanism, 40 above described, serves to cause the grinding wheel 34 rapidly to approach or recede from the work piece. In order to reduce the rapid ap 45 proaching movement to a predetermined grinding feed, it is desirable to provide a wheel feed regu lator or controlling mechanism, such as a- dash pot mechanism, which may be rendered effective when the grinding wheel 34 is about to contact 50 with the surface of the work piece being ground. As illustrated in Fig. 2, an outwardly projecting casing 85 is ?xed to the head of the cylinder 53 and contains a pair of diametrically spaced dash pot pistons 86 and 81. The dash pot pistons 86 55 and 81 normally are held in a rearward position by springs 88 and 89 respectively. During the rapid approach of the grinding wheel 34, the dash pot pistons are inoperative. The piston rod 55 extends toward the rear of 60 the machine and is provided at its outer end with a sleeve 9| which may be adjusted longitu dinally on a threaded portion 92 on the piston rod 55 and locked in adjusted position thereon by a lock nut 93. The parts are 50 arranged that the 65 sleeve 9| moves rearwardly when the piston rod‘ 55 moves toward the rear. The dash pot pistons 86 and 81 are limited in their rearward movement by means of adjusting screws 94 and 95, respec tively. When fluid under pressure is admitted to 70 the cylinder chamber 51 to cause the grinding wheel 34 to move toward the work piece, the rapid approaching movement thereof continues until the end of the sleeve 9| engages the ends of the dash pot pistons 86 and 81, respectively. '3 2,117,917 The continued movement of the piston 54 toward . the left (Fig. 2) is resisted by the dash pot pistons 88 and 81, respectively, which forces ?uid under pressure from the dash pot chambers 91 and 98 into a reservoir 99. The‘ dash pot chambers 91 and 98 are preferably interconnected with each other by the groove I02 and are arranged to ex haust ?uid therefrom either through a needle valve I00 or an adjustable throttle valve IOI into heads H5 and H8 are mounted on a swivel table II9 which is provided on the work supporting table 2I. The work heads H5 and H8 rotatably support a pair of aligned work supporting andro tating spindles H1 and H8, respectively. The table 2I is provided~with the usual swivel table II9 which is arranged to pivot on a central stud I20 set in the table 2I and projecting into a corresponding shaped aperture I2I in the swivel table H9. The upper surface of the swivel table 10 I I9 is formed with a dovetailed surface I22. The ably is located on front of the machine Fig. 1. work head I I5 is provided with a dovetailed sur Positive stop face I23 which mates with the surface I22 on the swivel table II9. A clamping block I24 held In order to grind a work piece to a predeter mined size, it is necessary to feed the grinding - in position on the work head II5'by a clamping 15 15 wheel 34 toward the work piece to grind the same screw I25 serves securely to lock the head H5 in 10 the reservoir 99. The throttle valve II'II prefer and then to stop the infe'ed and allow the grind ing wheel 34 to grind out or to allow the sparks position thereon. Similarly, the head I I8 is pro to die out in order to round up the work so that it will be ground to a true cylindrical surface of a with the surface on the swivel table H9, and a clamping block I21 and clamping screw I28 se 20. vided with a dovetailed surface I28 which mates - casing 85, thereby positively limiting the infeed curely clamp the work head H8 in position on the swivel table H9. The spindles H1 and H8 are provided with a suitable driving mechanism so that they may be rotated in synchronism with each other so as to provide a uniform timed driving of opposite ends ‘of the work piece. In the construction illus ing movement of the grinding wheel 34 and caus ing the wheel to dwell in contact with the work left-hand end of the swivel table H9. The mo predetermined size. As illustrated in Fig. 2, the forward movement of the piston rod 55 causes a rapid approach until the sleeve 9I picks up the dash pot pistons 88 and 81 to cause a slow in feed which continues until. an adjustable sleeve 25 I04 engages a fixed surface I05 on the rear of the 30 during the ?nish grinding period. The adjust able stop sleeve I04 surrounds the sleeve 9I and is held in adjusted position thereon by means of lock nuts I08. . The throttle valve' IN is connected by a pipe 35 I08 with the reservoir 99. The pipe I08 also connects the reservoir 99 to a ball check valve I09 which remains closed during the forward feeding movement of the grinding wheel but which is opened upon the rearward movement of the grinding wheel 34 as the dash pot pistons 88 v trated an electric motor I34 is mounted on the tor I34 is provided with a motor shaft I35 con nected by a coupling I38 with a rotatable shaft I31 journaled in bearings I38 and I39 in the head H5. The shaft I31 carries at its inner ' end a gear 'I40 which meshes with a gear I“ mounted onwthe end of a rotatable shaft I42. 35 One end of the rotatable shaft I42 is journaled in a bearing I43 in the head H5 and the other end of the shaft I42 is journaled in a bearing I44 in the head H8. The shaft I42 is connected- to simultaneously rotate the spindles H1 and “8,. 40 40 and 81 move to a rearward position to allow. respectively. A sprocket I45 is keyed on the quick return of fluid to the dash pot chambers left-hand end of the shaft I42 (Fig. 4) and is connected with a sprocket I48 on the work spin 91 and 98, respectively. die I I1 by means of a link chain I41. An adjust The dash pot mechanism is normally an inde ably mounted idler sprocket I48 serves to take up _ 45 pendent fluid mechanism during the normal oper ation of the machine. In order readily to fill the reservoir 99 to maintain the desired quan tity of ?uid therein, a pipe H0 is connected be—_ tween the pump 59 and reservoir 99. A valve III is located in the pipe IIO to control the ?ow of fluid through the pipe IIO. An‘ over?ow pipe H2 is connected between the vertically extend ing portion of the reservoir 99 and the main reservoir 8I within the base '20 of the machine so that in case the fluid within the reservoir 99 rises above a desired level, the excess ?uid will return directly to the reservoir within the base of the machine. Ordinarily the valve III‘ is , merely opened when it is desired to ‘fill the reser voir 99 andrthen remains closed during the nor 60 mal operation of the machine. If desired, how ever, in order to insure the ‘?uid level within the reservoir 99 at all times, the valve III may be opened partially so that there will be a con tinuous flow of fluid into the reservoir 99, and in 65 this case the overflow pipe II2 serves to prevent the fluid level rising above the desired point. ' Work supporting and rotating mechanism - In order to grind the entire peripheral surface 70 of a work piece automatically, it is desirable to provide means for supporting and driving the opposite ends of ‘the work piece to center and support the work piece as well as to rotate it during the grinding operation. In the construc 75 tion illustrated, a pair of spaced work supporting any lost motion in the chain I41 and to maintain the chain in the desired driving tension. Similarly, the other end of the shaft I42 is provided with a sprocket I50 which is connected with a sprocket I5I mounted on the rotatable work ‘spindle II8 by means of a link chain I52. An idler sprocket I53 serves to tension the link chain I52 as desired. By means of this driving mechanism, the work supporting and rotating spindles H1 and H8 may be rotated in synchro- > nism with each other. It isdesirable to provide a suitable adjustment in the driving mechanism so that the two spin dles having specially shaped work supporting and driving centers may be timed accurately with each other and thereafter rotated in absolute synchronism with each other. To accomplish this‘result, the sprocket I50 is not ?xed to the shaft I42 but is rotatably supported thereon. A plate I55 is mounted on and ?xed to a hub pro 65 jecting from the sprocket I50. The plate I55 is mounted on and ?xed to a hub projecting from the sprocket I50. The plate I55 supports a driving stud I58 which is arranged to drive a plate I51 which is ?xedly fastened to the end of 70 the drive shaft I42. The plate I51 is provided with a cut-out. portion I58 which is of sufficient’ size and width‘ to allow freedom of movement and adjustment of the stud I58 carried by the plate I55. The cut-out portion I58 provides a 76 w 4 2,117,917 pair of opposed adjusting screws I6I and I62 which are carried by the‘projections I59 and I60, respectively, on the plate I57 and serve to engage opposite sides of a squared end portion of the stud I56. By slacking OH on one of the screws I 6| or I62 and tightening the other screw, the plate I55 may be adjusted angularly relative to the plate I57 so as to time the work supporting spindle I I8 in the desired relationship with the 10 work supporting spindle I I7. In order to clamp or lock the plates I55 and I57 in adjusted position, a pair of clamping screws I63 and I64 are provided. These screws pass through elongated slots I65, I66 in the plates 15 I57 and are screw threaded into the plate I55 so that the two plates may be rigidly locked in ad~ justed position when desired, thus permitting timing of the work spindles. Work spindles The two aligned opposed work supporting heads H5 and IIS are substantially identical in construction, the only difference being that one is a right-hand and the other a left-hand head. Consequently, only one oi these heads has been shown in detail in cross section. It should be understood, therefore, that the right-hand head (Fig. 3) is identical in construction and descrip tion with that described and illustrated incon nection with the left-hand head. A collar III) is threaded onto the end of the spindle II ‘I and as by means of a ?ange I90 which is provided with an integral hub I 9| that is connected to the sleeve I78 by a screw I92 havinga cylindrical end portion thereon engaging an elongated slot in the sleeve I78. The flange I90 is positioned within a recessed portion I93 in the left-hand end of the piston I86 and is located between the bottom of the recess I93 and a plate I94 which is fastened on the end of the piston I86. A collar I95 is fastened on the end of the sleeve I78 by means of a screw I96. The collar I95 is pro vided with an adjusting screw I97 which is ar ranged parallel with the sleeve I78 and which serves to adjust the amount of lost motion be tween the piston I86 and the ?ange I90. The piston I86 is arranged "so that the sleeve I78 ro tates therewithin and ‘the lost motion connection between the piston and the sleeve I78 serves to allow the spindle to be rotated and the sleeve I78 to rotate freely without any friction between 20 the ?ange I90 and the piston I86. The springs I87 serve normally to hold the piston I86 in the position illustrated in Fig. 4, that is in a position toward the right, bearing against a thrust collar I98 which is ?xedly mounted within and at one ‘ ' end of the cylinder I85. It will be readily apparent from the foregoing disclosure that the slidably mounted sleeve I75 within the work supporting spindle I I7 is normal ly held in a position toward the right, that is, in ‘ operative position to support and drive a work contains a plurality of springs III which are ar piece I88 by means of the spring I79. The pis ranged automatically to apply a tension to the ' ton I86 is normally held in a position toward parts of the anti-friction ball bearings I38 and IBI so that lost motion between the bearing parts is taken up at all times during the operation of the machine.‘ For convenience of assembly and manufacture. "the spindle M7 is formed in two parts compris ing the outer part Ill and an inner sleeve I72 which has a flange IE3 engaging a corresponding ly shaped aperture in the spindle III. The other end of the sleeve I72 is threaded and a col lar I78 ?tted thereon serves to lock the spindle 46 II‘I and sleeve I72 so that they rotate together. 'A sleeve I85 is slidably keyed within the sleeve I72 by means of a'key I76. The outer end of the sleeve I75 is provided with a tapered aperture adapted to receive the tapered portion of a work 50 supporting and driving center I'M. A sleeve I78 within the sleeve I75 serves to locate a spring I79. >The spring I79 is located between a ?ange on the sleeve I78 and a collar I80 which is screw threaded within the sleeve I72. The compression 55 of the spring I79 serves normally to hold the work supporting and driving center I77 and its supporting sl?eve H5 toward the right (Fig. 3) into a driving position, as illustrated therein. A ?uid pressure cylinder '85 is formed either 60 integral or ?xedly mounted on the end of the work head H5. The cylinder I85 contains a pis ton I86 which is slidably mounted therein and is normally held in a position toward the right, (Fig. 3) by two springs I87 to aid in moving and ' holding the work supporting center I77 in a di rection toward the right to support and drive a work piece I88 having ‘a plurality of broached splines therein. _ To retract the center I77, ?uid under pressure 70 may be admitted to a cylinder chamber I89 with in the cylinder I85, which serves to cause the sleeve I75 to be moved toward the left (Fig. 3) against the compression of the spring I79. 75 I The piston I86-is preferably connected with the sleeve I78. by a lost motion connection, such the right against the ?anged portion I98 at the end of the cylinder I 85 by means of the springs I8'I. When it is desired to retract the center after a work piece I88 has been ground, ?uid under pressure is admitted to the cylinder cham ber I89 to move the piston I86 toward the left against the compression of the springs I87 and L to retract the sleeve I75 toward the left against the compression of the spring I79 to withdraw the work supporting and rotating center I77 to an inoperative position. The ?uid pressure sys tem for controlling the admission of ?uid to the cylinder I85 will be hereinafter described. Similarly, the right-hand head H6 (Fig. 3) is provided with a spindle and sleeve construction identical with that above described in connection with the left-hand head ~H5. The right-hand head H6 is provided with a cylinder 200 having a piston 20I slidably mounted therein. The pis ‘ton 20I is normally held in the position illus trated in Fig. 3, up against a ?ange or thrust plate 202 (Fig. 4), ?xed to the inner end of the ; cylinder 200, by means of two springs 203. A lost motion connection is provided to connect the piston 20I to a sleeve 204 within the spindle II8. This lost motion connection comprises a ?ange 205 having a hub 206 formed integral therewith. ‘The ?ange 205 is located within a recess 207 within the piston 20I and the ?ange 205 is located between the bottom of the recess 207 and a plate 208 partially covering the end of the recess 207. The hub 206 is provided with a screw 209 which has an inwardly projecting por tion sliding within an elongated slot in the sleeve 204. A collar 2I0 is ?xedly mounted on the end of the sleeve 204 by means of a screw 2H and is provided with an adjusting screw 2I2 arranged To to engage the ?ange 205 and adjust the position of the ?ange 205 relative to the sleeve 204 and thereby adjust the amount of lost motion be tween the ?ange 205 and the piston 20I. ‘ The spindle H8 is provided with an inner longi 5 2,117,917 L work supporting and rotating centers I11 and 2 I4, respectively, and similarly to discharge work therefrom after a grinding operation has been tudinally slidable sleeve 2I3 similar to the sleeve I15 in the work head II5, which in turn sup ports a work supporting and rotating center 2I4 similar to the center I 11. The spindle IIB has anti-friction ball bearings I32 and I33, similar to bearings I38 and I3I in the work head H5, and the take-up for lost motion is the same. Since both of the work supporting centers I11 and 2I4 are arranged for endwise movement to 11 ward and from each other to grip and release a work piece I88 which is held thereon and there between for a grinding operation, it is desirable to provide suitable elements which may serve both to locate the work piece I88 in a predetermined completed thereon. In order to reduce the idle time of the machine during the loading and un loading operation, it is desirable to provide a suit able work loading device'whereby a new unground work piece I88 may be picked up from a maga zine or hopper simultaneously with the gripping of the ground piece of work and the work loader 10 then moved to shift the ground piece of work to a ' position with relation to the grinding wheel 34 and which also may serve as strippers to hold the 15 single movement of the work carrier or loader. In the construction illustrated, a work hopper or magazine 221- carrying a plurality of un Work piece I88 against endwise movement during the withdrawal of the work centers I11 and 2I4. A sleeve 2 I 5 surrounds the slidable center support ing sleeve 2 I3 on the work head I I6. A ?ange 2I6 is formed integral with the sleeve, 2I5 and is ?xedly secured to rotate with the spindle I I8. The end face of the sleeve 2I5 serves to locate the right-hand end of the work piece I88 when gripped between the supporting centers I11 and 2I4. In order to compensate for any slight variations in the length of successive work pieces I88, a sleeve 2I1 surrounds the longitudinally adjustable ‘ ‘ sleeve I15 of the work head I I5. The sleeve H1 is discharge position while moving the unground piece of work into alignment with the center, thereby unloading and loading the machine in a ground pieces of work I88 is bracket 228 ?xed to the work H5 and H6 (Figs. 5 and 17). the work discharge chute 221 supported by the supporting heads The outer end of 20 is similarly sup ported by an inverted V shaped supporting frame ‘ 229 which is adjustably connected to a bracket 230 which connects the heads H5 and H6. The frame 229 is provided with elongated slotsthrough 25 which clamping bolts pass and which are ar ranged to clamp the frame 229 in adjusted posi tion on the supporting bracket 230. By adjust ing the frame 229 vertically, the angular posi tion of the work magazine or hopper 221lmay be varied as desired so that the successive work so. provided with an integral ?ange 2I8 which is ?xedly mounted on the end of the spindle II1 to rotate therewith. In order to compensate for pieces I88 will roll in succession into an operat- , any slight variations in length of successive work - the outer ends of the heads H5 and H6 is pro vided with an inwardly extending boss 23I (Figs. 35 pieces I88, a second sleeve 2I9 is slidably mount cd within the sleeve 2" and is normally urged‘ toward the right (Fig. 4) by means of equally spaced springs 220. A plurality of balls 22I ar ranged in spaced relationship are interposed be tween the sleeves 2I1 and 2I9 to allow the inner sleeve 2I9 to slide freely therewithin and also serve to drive the sleeve 2I9 with the sleeve 2". A band 222 mounted in a recess in the sleeve 2I1 maintains the balls ‘MI in driving position. The end face of the sleeve 2I9 engages the left-hand end of the work piece I88 (Figs. 4 and 11) and serves when the sleeves I15 and 2I3 are moved toward each other to grip a work piece I88 to move the work piece endwise so that its right hand end engages the end of the sleeve 2I5. Due to the springs 228, the sleeve 2I9 may yield relative to the sleeve 2I1 to compensate for any slight variations in the length of successive work pieces I88. The sleeves 2 I5 and 2 I 9 also serve as strippers to hold the work piece I88 against endwise motion ing position. The bracket 230 which connects 3 and 5) which serves as a support for a pivot shaft 232 which passes through an aperture with in the boss 23I and is held in adjusted position therein by means of a set screw 233. A work carrier frame 235 is provided with a 40 pair of spaced downwardly extending arms '235 (Fig. 1) which have enlarged hubs 231 and 238, respectively,'at their lower ends, each of which is provided with a bushing or bearing member 239 and 240, respectively, which are pivotally sup 45 ported on the non-rotatable shaft 232 and serve to permit the work carrier frame 235' to be rocked about the shaft 232 as an axis. ' The work carrier frame 235 is provided with a longitudinally extending fluid pressure cylinder 50 245. A piston 246 is slidably mounted with in the cylinder 245.‘ -A piston rod 241 is ‘formed integral with the piston 246 and passes through a cylinder head 248 having a ?uid tight ‘packing, which serves as a bearing support for the piston 55 rod 241. A circular slide cover 249 is fastened on the outwardly projecting end of the piston rod when the sleeves I 15 and 2I3 are withdrawn to 241 by means of a nut 250 threaded onto the end release a ground piece of work I88. vIn order to hold the work supporting centers of the piston rod. A work carrier head 25I is I11 and 2I4 in position within the sleeves I15 ?xedly mounted on the slide cover 249 so as to and 2I3, a rod 223 having a head 224 extends move therewith. The work carrier head 25I is provided with a pair of spaced plates 254 and 255 within the sleeve I18 and is screw threaded into (Fig. 16) having spaced pockets 252 and 253 the tapered portion of the center I11 so as to lock formed therein which are of a diameter substan the center I11 in ‘a de?nite operating position. Similarly. a rod 225 having a head 226 extends tially equal to the piece of work I88 to be ground 65 and are spaced apart by a distance substantially through the sleeve 204 and is screw threaded into equal to the spacing between the piece of work the center 2I4 to lock the same in an operative I88a in the lower portion of the hopper 221 and position within the sleeve 2I3. ‘ Work magazine or hopper In a machine of this type, in order to make it fully automa‘ic in its cycle of operation, it is de sirable to provide a work feeding and discharging mechanism for automatically conveying succes sive work pieces into alignment with the opposed the work piece I88, which is mounted on the centers I11 and 2M and has been ground to a 70 predetermined size. I In order to maintain the work carrying hea 25I and its associated parts in a vertical position during the movement of the piston 246, 'a slide block 243 is ?xedly attached to a slide cover 249 75 6 2,117,917 which surrounds the cylinder head 248. The slide block 243 is slidably supported on a cylindri cal surface on the front end of the work carrier frame 235 and the cylinder head 248. The slide block 243 and the slabbed-of‘f surface 244 on the frame 235 serve as a guide to maintain the work carrying head 25! in an operating position and prevent rotation thereof with the piston 246. A pair of pivotally mounted spring actuating 10 ?ngers 256 and 251 are provided on the work carrying head 25I which serve to hold a work piece I88 within the pockets 252 and 253 during respectively, which project inwardly toward each other. The heads of the 299 and 29I screws serve to bear against the work piece I88a to hold the same within the hopper 221 until it is gripped and transferred therefrom by the forward and downward movement of the work carrying head 25L A spring 292 is interposed between the upperv end of the lever 286 and a portion of the bracket 228 supporting the hopper 221 and serves normally to hold the lever 286 in the position il 10 lustrated in Fig. 5, with the head of the screw 299 engaging the work piece l88a. An adjust the transfer movement from the magazine or able stop screw 293 serves to limit the rocking hopper 221 to the work centers I11 and 2M and ' movement of the lever 286 in a clockwise direction (Fig. 5) and similarly an adjustable stop screw 15 from the work centers‘to the discharge chute. The ?ngers 256 and 251 are pivotally mounted 294 serves to limit the rocking movement of the on the upper part of the plates 254 and 255 of arm 286 in a counterclockwise direction. The the work carrier head 25l by means of studs 258 arm 2841 is similarly mounted, so that a spring and 25.9 to grip and hold the work-piece I88a 295 normally rocks the lever 281 in a counter 20 therein. Similarly, a pair of spring actuated trip clockwise direction (Fig. 3) to maintain the screw ?ngers 269 and 26I are arranged on opposite 29I in position to support the work piece I88a in sides of the lower part of the plates 254 and 255, position with the work carrier pockets 252. An respectively, and pivotally supported thereon by adjustable stop screw 296 carried by the lever 281 studs 262 and 263 and positioned to hold a ?nish 25 ground work piece I88 ‘within the pockets 253 so as to transfer it to a discharge position. serves to limit the rocking movement of the lever in a counterclockwise direction, Fig. 3. Similarly, a stop screw 291 carried by the lever 281 serves to The ?nger 256 is normally held in the position limit the rocking movement of the lever 281 un illustrated in Fig. 5 by means of a spring 265 , der the in?uence of the spring 295 in a clockwise which is connected between a stud 266 carried by direction (Fig. 3). It will thus be seen that by 30 the plate 254 and a stud 261 mounted on the means of the spring actuated, pivotally mounted 30 ?nger 256. An adjustable stop screw 268 carried levers 286 and 281, the heads of the screws 299 by the ?nger 256 together with a stop pin 269 and 291 engaging the lower workpiece I88a in mounted on the work carrier head 25l serves to the hopper, 221 serve to retain the work piece in limit the movement of the ?nger 256 in a counter this position until the same is grasped by the pockets 252 on the forward movement of the 35 clockwise direction. The ?nger 251 is held in a similar position by - work carrier head 25I. means of a spring 212 which is fastened at one The work carrier head and associated parts, end to a stud 213 carried by the plate 255 and as shown in Fig. 5, are in a grinding position, that fastened at its other end to a stud 214 on the is the grinding wheel 34‘is in engagement with ?nger 251. An adjustable stop screw 215 carried the work I 88 and the work is ground substantially 40 40 by the ?nger 251 and a stop pin 216 serve nor to size. After completion of grinding on the mally to hold the ?nger 251 in position to sup port a work piece I88 in the pocket 252. The tension'of the springs 265 and 212 is sufficient to hold a work piece I88 in the pocket 252 when 45 the work carrier head 25I is moved forward and . to withdraw the same from the hopper 221 when the work carrier 25I is swung' to discharge a ground piece I88 and present a new piece of work I88a into alignment with the work centers 50 I11 and 2“. work piece I88, the work carrier head 25I is preferably moved in a substantially horizontal plane so that the pockets 252 grip the work piece |88a and the pockets 253 grip the ground work piece I68. The work carrier 25I and its associated parts are moved forward to grip the groundwork piece I88, as shown in Fig. 6. The work car rier head 25l and" associated parts are then rocked about” the shaft 232 as a pivot to swing 50 ‘ the ?nished ground work piece I 88 into position The ?ngers 269 and 26 I‘ ‘are similarly arranged, , l89b (Fig. 7), in alignment with the upper end each having a spring 218 interposed between of a discharge chute Y399 and at the same time Studs 219 on the plates 254 and 255 and a stud swings the work piece I88a into position I 88 in 289 on the upper surface of each of the ?ngers 55 269 and 261 normally tending to hold‘the ?ngers alignment with the work supporting and rotat 55 ing centers I11 and 2“. The work carrier 25I in the position illustrated in Fig. 5, with the ad and its associated parts, while in a tilted posi justable stop screw 28l in engagement with a stop tion, are then withdrawn from the position shown pin 282 carried by the plates 254 and 255. in Fig. 7. As the work carrier head 25I recedes The hopper 221, as illustrated, comprises a from the position in Fig. 7, a pair of ,lugs 391 60 trough of a box-like cross sectional area having a portion of the top out out. The inner cross sectional area of the carrier is of sufficient size to allow a'free rolling movement of the work 65 pieces I88 as they are placed in the machine. and 392 on the discharge chute 399 engage the ground work piece I88!) and hold it in the upper end of the discharge chute as the work head 25I recedes from the work. During this movement, the gripping ?ngers 269 and 26l are rocked 65 The outer portion of the hopper 221 is arranged about their studs 262 and 263 to release the in an inclined manner so that the work pieces work piece |88b from the pockets 253 into the will roll toward the dischargeiend of the hopper. discharge chute 399 whereupon the ?nished The ?rst work piece I88a in the hopper 221 rests ground work piece I88 rolls by gravity to the 70 on a surface 285 at the lower end of the hopper pan 393 carried by the table 2| on the front of 70 221 and is held in position therein by a pair of the machine. Excess coolant ?uid is exhausted spaced pivotally mounted arms 286 and 281 which through the ?exible hose 394 into the coolant are pivotally mounted on studs 288 and 289, re reservoir in the base 29 of the machine. spectively (Fig. 16) . The lower end of each arm Similarly, before the work carrier 25I starts its rearward movement, that is, toward the left 75 286 and 281 is provided with a screw 299 and 29I 7 2,117,917 (Fig. 7), the work gripping centers I11 and 2“ have gripped the work piece I88 and the with drawal movement of the work carrier headp25I rocks the ?ngers 256 and 251 to withdraw the pockets 252 from engagement with the new piece of work I88 to be ground. The work carrier head 25I and its associated parts then assume the position illustrated in Fig. 8, after which the work carrier 25I and parts are rocked in a counter 10 clockwise direction to return into the normal po sition of the parts, as shown in Fig. 5, ready for the next cycle of movement thereof. The movement of the work carrier 25I simul taneously to. pick up a new piece of work I88a 15 to be ground and the piece of work I88 which has been ground and simultaneously to shift them into an operating position and a discharge position, respectively, serves to reduce the idle movement and thereby increase the production The movement of ‘the work carrier head 25I is preferably hydrau lically actuated by means of a pair of pistons and 20 and e?lciency of the machine. vcylinders, one of which moves the work carrier in a horizontal position and the other of which 25 serves to rock the work carrier to transfer the work pieces, as above described. These two cyl inders and pistons are interconnected so that they operate in timedrelation with each other. In the position of parts as shown in the dia— 30 gram in Fig. 2, ?uid under pressure, from the pump 59, passes through the pipe 62 into the chamber 65 of the valve 58 and passes out through a pipe 385, a section of which is ?exible hose to allow free rocking of the work carrier frame 235, 35 through a passage 386 in a valve 381, through a pipe 383 and'a valve 389 and a pipe or passage 3I8, into a cylinder chamber 3“ within the cylinder 245 to move the piston 246 together with the piston rod 241 and plate 248 carrying the work carrying head 25I toward the left, (Figs. 2 and 40 5) to, withdraw the work carrying head 25I into its rearward or inoperative position as shown. During the movement of the piston 246 toward the left, ?uid withina cylinder chamber 3| 2 cylinder chamber 325, which serves to produce a downward movement of the cylinder 3I6 and the work carrier frame 235, the piston 3" being held ?xed to the bracket 238 to swing the work carrying frame 235 from the position illustrated in Fig. 8' into the position illustrated'in Figs. 2 and 5. During the downward movement of the} cylinder 3I6, ?uid is exhausted from a cylinder" chamber 326, through a pipe or passage 321, through radially extending holes 328 in the cyl 10 inder 245 and through longitudinally arranged . holes 329, which extend to the circular groove which connect with the holes 328 within the pis ton 246. Fluid under‘ pressure passing there through moves the collar 338, compressing a 15 spring 33I and thereby allowing ?uid passing through holes 329 to enter the cylinder chamber 3I2 and exhaust through pipe or passage 3I3, as above described. Normally the collar 338 seals the holes 328 when ?uid is admitted into the 20 chamber 3I2 to move the piston 246. The valve 381 is normally inoperative and re mains in the position illustrated‘in full lines in ~ Fig. 2, except when it is desired to set up the work carrying head 25I and its associated mecha 25 nism when the same may be manually operated to move the work carrying head 25I independent of the other mechanisms of the machine. When the wheel feed control valve 58 is shifted into its reverse~ position, the direction of ?ow of 30 ?uid under pressure to the cylinder 245 is changed so that ?uid under pressure passes through the pipe 3I3 into the cylinder chamber 3I2 to cause the piston 246 to move'toward the right (Figs. 2 and 5) so as to move the work carrying head 35 25I into the position illustrated in Fig. 6. The ?uid in the cylinder chamber 325 is exhausted through the passage 324 into the radially extend ing holes 332 in the cylinder 245 through the longitudinally equally spaced holes 333 which ex tends to the continuous groove, and connects - with the holes 332, within the piston 246, which moves the collar 334, compressing the spring 335, thereby allowing ?uid passing through the holes exhausts through a pipe or passage 3I3 and a 333 to enter the cylinder chamber 3“ and ex 45 valve chamber 314 in the valve 381 and passes I haust through the pipe or passage 3l8, so as to through a pipe 3I5, a section of which is ?exible hose to allow freerocking of the work carrier frame 235 to the valve chamber 66 in the valve 56 and through the exhaust pipe 69 into the res -50 ervoir 6|. The valve 389 is adjusted to regulate the load ing and discharging speed of the work carrying‘ head 25I to time it with the movement of the work centers I11 and 2“ and also to reduce the force of the blow of the piston 246 at each end of stroke to obtain smoT'thness and quietness of operation. Inorder to rock the'work carrying head 25I to move a work piece I88a from the hopper 221 into alignment with the work gripping centers I11 and 2“, and to transfer a work piece I88 from the ,work centers to the discharge chute 388, a ?uid . pressure cylinder 3I6 is ?xedly mounted on the outer end of the work carrier frame 235 and is ar 65 ranged in a substantially vertical position, at right angles to the cylinder 245. The cylinder 3I6 contains a piston 3| 1 which is connected by a piston rod 3I8 and a grooved spool shaped mem ber 3I9 with a pair of opposed shoes 328 and MI 70 which engage the groove in the spool shaped member 3I9 and are pivotally supported by trun nions 322 and 323 on the bracket 238. 75 move the work carrying head 25I into the position illustrated in Fig. '7, simultaneously transferring a ground piece of work I88 into the opening of the discharge chute 388 and transferring a new piece of work I88a‘ from the hopper 221 into alignment with the work gripping centers-I11 and 2I4. As soon as the work centers have gripped . the work I88, as hereinafter described, the feed valve 58 is again shifted, by energizing the sole 55 noid 15, into the position illustrated in Fig. 2, in which position ?uid- under pressure causes a rearward movement of the work carrying head 25I into- the positionlillustrated in Fig. 8, after which ?uid is admitted to the cylinder chamber 325 again to rock the work carrier head 25I into _ the position illustrated in Figs. 2 and 5. Electrical control and interlock In a machine of this type, it is desirable to 65 provide suitable interlocks between the various mechanisms of the machine‘to insure safe opera ticn thereof, without endangering the-operator‘, or damaging the work pieces I88 passing there through. It is desirable to provide an electrical 70 interlock between the work gripping centers I11 and 2I4 and the wheel fccd control valve 58 so that the solenoid 15 cannot‘ be energized-unless Fluid under pressure entering @the cylinder boih of the work gripping centers are in an oper chamber 3“ passes through a passage 324 into a > ative position in engagement with the work piece 75 8 2,117,917 . I88 to be ground. The mechanisms of the ma chine, as shown diagrammatically in Fig. 2, are in a grinding position. The trip switch 336 is normally held in a closed position by means of a spring 331. An actuating plunger 338 is ar ranged in the path of an adjustable screw 339 carried by a pivotally mounted lever 348 mount ed on a stud 34I ?xed to the end of the cylinder I85 of the work head II5. A rod 342 is ?xed to ing and the other ends of which are fastened to studs 313 and 314 on the rock arm 364. These springs normally tend to rock the rock arm 364 in a counterclockwise direction. A cylinder chamber 315 within the valve 368 is connected by a pipe 316 with a passage 311 in a cycle tim ing valve 318. The passage 311 is connected by a ball check valve 319 with a passage 388 which enters a valve chamber 38I within the piston 10 the piston I86 and projects through an aperture within the end cover of the cylinder I85 and is arrangedxto engage the lever 348. A spring 343 having one of its ends connected to the upper 10 type cycle timing valve 318. The pipe 316 leading from the cycle timing end of the lever 348 and its other end connected 15 to a stud 344 ?xed to the top of the cylinder I85 serves normally to maintain the lever 348 in engagement with the rod 342. In the position pipe 383 to exhaust ?uid into the reservoir 6I. A valve 384 is located in the pipe line 382 and 15 serves to close off the exhaust from the cycle timing valve when desired in setting up the ma chine for grinding a given work piece I88. An adjustable throttle valve 385 is also located in the pipe line 382 and serves to adjust and con 20 trol the rate of exhaust from the cycle timing of the parts shown, Fig. 2, the switch 336 is closed. When ?uid under pressure is admitted piston and cylinder 368 also connects with a pipe 382 which in turn is connected with an exhaust I to the cylinder chamber I89 to cause the piston I86~ to move toward the left to withdraw the work centers I11 and 2I4 to an inoperative posi , piston and cylinder 368 and thereby to control the cycle of operation. Whenthe ?uid is ex tion, the rod342 rocks the lever 348 in a coun hausted from the chamber 315 in the cycle tim ter-clockwise direction, which serves to move the 25 switch actuating plunger 338 toward the left, ing piston and cylinder 368 by the piston 361, 25 ‘Fig. 2, to trip the switch 336 and thereby break the ball check valve 319 is closed by back pres sure of the ?uid so as to allow ?uid to exhaust the circuit. only through the pipe 316 to the needle valve A similar safety connection including a nor mally closed trip switch 345 is normally held in 385 in the pipe line 382 to exhaust through the 30 a closed position by means of a spring 346. An actuating plunger 341 is arranged in the path of V an adjustable screw 348 carried by a pivotally mounted lever 349 mounted on a stud 358 ?xed to the end of the cylinder 288 of the work head II6. A rod 35I is ?xed to the piston 28I and projects through an aperture within the end cover of the cylinder 280 and is arranged to" en-, gage the lever 349. A spring 352 having one of its ends connected to the upper end of the lever 349 and its other end connected to a stud 353 serves normally to maintain the lever 349 in en gagement with the rod 35I. In the position of -the parts shown in Fig. 2, the switch 345 is closed. When ?uid under pressure is admitted to the cylinder chamber 2I2 to cause the piston 2III to move toward the right (Fig. 2) to with draw the work center 2I4 to an inoperative posi tion, the rod 35I rocks the lever 349 in a clock wise direction which serves to move the switch actuating plunger 341 toward the right (Fig. 2) to trip the switch 345 and' thereby break the circuit. A similar trip switch 368 is operatively con nected to be actuated by a cycle timing valve to_be hereinafter described. The switch 368 is normally held in an open position by means of a spring 36I and is provided with an actuating plunger 362 which is arranged in the path of an adjustable screw 363 which is mounted in they . upper end of a rock arm 364. The rock arm 364 is pivotally mounted on a stud 365. The lower end of the rock arm 364 is arranged to engage a plunger 366 which extends from and is formed integral with a piston 361 of a cycletiming cyl 1 inder. 368. Cycle timing piston and cylinder , The cycle timing piston and cylinder serves to control the admission of ?uid under pressure to the work head actuating cylinders in timed rela tion with the other mechanisms of- the machine. The piston. 361 is normally held in a right-hand position (Fig. 2) by means of a pair of springs '369 and 318 which are connected between studs 3" and 312, respectively,v on the cylinder cas pipe 383. 30 Cycle timing valve The cycle timing valve 318 is preferably a pistontype valve comprising the valve pistons 386, 381, and 388 which are formed integral with a valve stem 389, thus forming valve chambers 35 398, 38I, 392, and 393. As shown in Fig. 2, ?uid under pressure from’ the pump 59 passes through the pipe 62 and through a pipe 394 which connects with the valve 318. In the position of parts as shown, the valve (0 piston 386 closes the port for the pipe 394. Fluid under pressure passing into the main control valve 58 passes out through a pipe 385 and through a pipe 395 and a throttle valve 396 into the valve chamber 390'to move the pilot valve to 45 the right-hand position, as shown in Fig. 2. The valve 396 serves to control the rate of admission of ?uid to the valve chamber 390 and thereby controls the rate of movement of the pilot valve. During this movement of the pilot valve, ?uid 50 within the chamber 393 exhausts through a pipe ’ 391, an adjustable throttle valve 398 and a pipe 3 I 5 which exhausts ?uid through the valve chamber 66 and returns it through the pipe 69 to the reservoir 8|. The valves 396 and 398 serve 55 to control the rate of movement of the cycle pilot valve. When the main control valve 58 is reversed and ?uid under pressure is admitted to the pilot valve chamber 393 to shift the pilot valve 318 toward the left, ?uid under pressure passing throughthe pipe 394 may enter the valve chamber 38I and pass through the passage 380, the ball check valve 319, the passage 311, the pipe 316, into thecycle timing piston and cylinder 368 to cause-the piston 65 361 to move toward the left, therebyrocking the rock arm 364 to move the switch plunger 362 to ward the right (Fig. 2) which in turn closes the switch 368 so that the work spindles grip the next work piece, thereby closing trip switches 336 70 and 345, which closes the circuit and serves to energize the solenoid 15 ' to start the infeeding movement of the grinding wheel. ' An adjustable stop screw 488 on the cycle tim ing valve 368 serves to limit the movement of the 75 9 2,117,917 piston 361 toward the left and thereby permits adjustment of the capacity of the cycle timing piston» and cylinder so as to admit-the‘ desired amount of ?uid to obtain the cycle of operation desired. , " t. A push button MI is provided in theelectrical circuit to stop and start the cycle of operation. This switch MI is connected in series with the normally closed trip switches 336; 345 and the 10 normally open trip switch 368. , The operation of this machine’ is‘freadily ap rocked to remove the ?nished work piece I88 and present an unground work piece I88a into align ment with the work centers I11 and 2I4 before the valve piston 388 covers the port to cut off ?uid from the pipe 391. When the pressure from the pipe 391 is cut off and the pipe M9 is uncov ered, the released compression of the springs I81 and 283, spring I19 in the work supporting head H5, and a similar spring in the work head “8 serves rapidly to move the work spindles simul taneously toward each other to engage the work centers I11 and 2I4 - with the unground work parent from the foregoing disclosure.‘ When it is a piece I88a. This movement serves rapidly to ex desired to start the machine in operation, a con haust ?uid from the cylinder chambers I89 and trol button 482 on the front of the-machine base 2I2 in the cylinders I85 and 288. Any leakage of 15 is actuated to start'the wheel rotation, a push ?uid by the pistons I86 and 28I is exhausted by button 483 is actuated to start the fluid pump, and an extension of the pipe 383 into the reservoir 'a push button 404 is actuated to-f start the work 6I. This movement of the spindles into an opera drive motor I34. The push button 48I is then tive position serves to‘ close the trip switches 338 20 ‘actuated to start the, cycle of operation. The and 345. The trip switch 388 being already 20 switch MI is connected in series with the trip _'closed, thereby completes the circuit to energize ‘switches 336, 345, and 358, and serves to’ energize the solenoid 15 to shift the feed control valve 58, ‘ the solenoid 15 which‘ shifts the controljvalve 58 so as to move the grinding wheel 34 toward the into the position shown in Fig. 2'to start ‘a forward work piece I88. At the same time pressure in the feeding movement of the grinding wheel 34. As pipe 385 passes through a passage 386 in a valve 25 suming a work piece‘ to be already located on the 381, through a vpipe 388, the valve 389 and the work centers, ?uid under pressure entering the pipe 3I8, into a cylinder chamber 3I I, to move valve chamber 65 passes into the pilot valve the work carrier 25I away from the work into chamber 398 to shift the cycle timing valve 318 the position shown in Fig. 8. The radially extend 30 into the position illustrated‘in Fig. 2'. The grind ing holes 328 are uncovered and at the same time 30 ing wheel 34 advances to grind the work I88 to the holes 332 are uncovered and ?uid passes the required size and the extent of the grinding through the passage 324 to the cylinder chamber operation, that is infeed and'dwell, is determined 325 to rock the work carrier head 25I into the by the adjustment of the cycle timing piston and cylinder 368 which meters ?uid from the valve chamber 315 through the variable throttle valve 385 into the exhaust. When the cycle timing pis ton 361 has moved toward the right a sufficient distance during ‘the grinding operation, the trip switch 368 is opened, thereby breaking the circuit 48‘ and deenergizing the solenoid 15 which releases the compression of the spring 82 and returns the feed control valve 58 to its reverse position so that ?uid under pressure is admitted through the valve chamber 88 into the cylinder chamber 58 to 45 cause a rearward movement of the grinding wheel 34; The shifting of the feed control valve 58 admits ?uid under pressure through the pipe 3I5 and the pipe 391 into pilot valve chamber 393 to start the cycle timing valve 318 moving toward the left and at ' the same time passes ?uid through the passage 3“ in valve 381 and through the pipe 3|3 into the cylinder chamber 3I2 to move the work carrying member 254 ‘forward simultaneously to grip‘ a; new piece of work I88a and the ground-piece_of work I88, When ?uid is admitted through the pipe 391 ' _ ‘into the pilot valve chamber 393 to cause the tim position illustrated ‘in Figs. 2 and 5. During the downward movement of the cylinder 3I8, ?uid is exhausted from the cylinder chamber 328 through the pipe 4I8, a ball check valve in cylinder I85, and through the pipe M4, the pipe M3, the valve M2, the pipe M8 and the pipe 4I9. During the period while the work gripping cen 40 ters are separated, a pipe M8 is uncovered by movement of the piston I88 toward the left (Fig. 2) which serves to admit ?uid under pres sure through a; valve M1 and pipe or passage 321 into cylinder chamber 326 to move the cylin 45 der 3I8'upwardly, thereby rocking the work car rier 25I in a clockwise direction to shift the ground piece of work I88 into a. discharge posi tion I88b and simultaneously to move a new piece of work I88a into axial alignment with the work 50 gripping centers. The arrangement above described is such that the exhaust of ?uid from the cylinder chamber , 328 through the valve 4“ is controlled in timed relation with movement of the pistons I86 and 55 28I which actuate thework gripping and rotat ] ing spindles. This arrangement of parts serves to delay applying of pressure of the, work car wing, valve .318 to move toward the, left,;' ?uid is} v "'r against, the workduring- its movement to rid'p'iéce‘of work to‘ they discharge sh pre'c 'off'work into-axialéalign ' 60 It’also’ serves.‘ to ’ elimi '- I'Hthé ‘ work *ca'rrying v“thef‘vilithdra a‘l of H operation,“ ‘ to tires e cylinderg ham v _ _ U , _ tantaneous'ly‘ while'thev " > I 86 ‘ alve"‘‘')4281 opened. which“ allows‘'- passage of c?uid etween the cylinder ‘chamber5f'326*,1'thei ‘pipe 3 2 1 ian‘dvjthépas‘sage 328 in"the1work>carrierhorizontal cylinder: ‘I This connection avoidsi-the delayed: ac , "timing 5 3 . The speed valve ‘m oi‘movement ‘is beingmovedtawa'rd ofthetimingthed‘e‘ft. valve- 318* tion'iof the?‘ Work‘ carryingimember'ian'di‘tends to ' "speedup thev‘oper'ation of ‘the ‘carrier. x»: 'as' governed by the v'alves 396 and 398 i's'such as‘v ' " ' The valve ‘4I2 is\provided to facilitate inde to‘ allow ‘time fo‘r'the work centers’ I11 and‘ 2 I4 to pendent movement of the work supporting cen be disengagedan'd the‘ work carrier '25I'to be 70 1@ 2,117,917 ters in setting up and adjusting the, machine ele cal interlock including trip switches actuated by ' ments. During the normal operation of the ma chine under control of the automatic cycle con the longitudinal movement of the work support ing spindles which are connected in series with said solenoid and are arranged to prevent ener gizing said solenoid until the work spindles are in supporting engagement with the work piece. 4. An automatic cylindrical grinding machine having a, transversely movable rotatable grind trol mechanism, the valve H2 remains in the position illustrated in Fig. 2. If it is desired man ually to operate the pistons independent of the cycle control mechanism, the valve “2 is shifted in a clockwise position into the position illustrat ed in dotted lines in Fig. 2 so that ?uid under 10 pressure from the pump 59 is admitted to the cylinder chambers I89 and 212, respectively, to withdraw the work supporting centers inde pendently of the cycle control. This cycle of operation is then continued on 15 successive pieces of work. By manipulation of the various control valves, the timing of the movement of the various hydraulically actuated parts may be regulated as desired to obtain-the desired coordination~ in the movement of the 20 various parts of the machine. _ It will thus be seen that there has been pro vided by this invention apparatus in which‘ the various objects hereinabove set forth together with many thoroughly practical advantages are As many possible em bodiments may be made of the above invention and as many changes might be made'in the embodiment above set forth, it is to be understood that all matter hereinbefore set forth »or shown 30 in the accompanying drawings is to be inter 25 successfully achieved. preted as illustrative and not in a limiting sense. I claim:- 1. An automatic cylindrical grinding machine having a transversely movable rotatable grinding 35 wheel, a pair of opposed axially aligned work supporting and rotating spindles, a work carrier to convey work pieces successively to said spin dles each of which is operated by a separate ?uid motor, a main control valve in control of said 40 grinding wheel ?uid motor and said work carrier ?uid motor, a cycle timing valve controlled there by, said cycle timing valve being in control of said spindle ?uid motor, and a cycle timing pis ton and cylinder to control the cycle of operation. 2. An automatic cylindrical grinding machine 45 having a transversely movable rotatable grind ing wheel, a pair of opposed axially aligned work supporting and rotating spindles, a work carrier to convey work pieces to said spindles each of 50 which is operated by a separate ?uid motor, a main control valve in control of said grinding wheel and work carrier ?uid motors, electrically operated means to actuate said valve- to cause an infeeding movement of ‘ the grinding wheel, a cycle timing valve controlled by said valve, said cycle timing valve being in control of said spindle ?uid motors, a cycle timing piston and cylinder to control the grinding cycle, and an electric switch actuated by said cycle timing cylinder to 60 operate said electrical means to shift the main control valve and thereby cause a rearward sep ing wheel, a pair of opposed axially aligned work supporting and rotating spindles, a work carrier 10 to convey work pieces to said spindles each 01' which is operated by, a separate ?uid motor, a main control valve in control of said‘ grinding wheel, an electric solenoid to actuate said valve to cause an infeeding movement of the grinding 15 wheel, a ‘cycle timing valve controlled by said valve, said cycle timing valve being in control of said spindle ?uid motors, a cycle timing piston and cylinder to control the grinding cycle, and an electrical switch actuated by said cycle tim ing piston and cylinder 'to actuate said solenoid to shift the main control valve and thereby cause a rearward separating movement of the grinding wheel. 5. An automatic cylindrical grinding 'machine 25 having a transversely movable rotatable grinding wheel, a pair of opposed axially aligned work sup porting and rotating spindles, means synchro nously to rotate said spindles, means to rotate said grinding wheel, means to move said spindles toward and from each other to grip a work piece therebetween,- a grinding wheel feeding mech anism, means including a solenoid to initiate an infeeding movement of the grinding wheel, and an electrical interlock including trip switches 35 actuated by the longitudinal movement of the work supporting spindles, said trip switches be ing connected in series with the solenoid so as to prevent actuation of the solenoid when ‘the spindles are separated. 40 6. An automatic cylindrical grinding machine having a transversely movable rotatable grinding wheel, a pair of opposed axially aligned work supporting and rotating spindles, a work carrier to convey work pieces to said spindles each of which is operated by a separate ?uid motor, a main control valve in controlof said grinding wheel and work carrier ?uid motors, an electric solenoid to move, said valve in one direction to cause an infeeding movement of the grinding 50 wheel, a cycle timing valve controlled by said valve, said cycle timing valve being in control of said spindle ?uid motors, a trip switch associ ated with said spindles and arranged to be actu ated when said spindles are separated, a cycle timing piston and cylinder to control the grind ing cycle, an electric switch actuated by said cycle timing piston and cylinder,'and electrical con nections between said trip switches, said elec trically operated‘ switch and solenoid, whereby 60 the solenoid is ‘rendered inoperative when th arating movement of the grinding wheel. spindles are separated. ' 3. An automatic cylindrical grinding machine '7. An automatic'cylindrical grinding machine having a transversely movable rotatable grinding ' having a transversely movable rotatable grinding wheel, a pair of opposed axiallyaligned work wheel, a pair of opposed axially aligned work supporting and rotating spindles, means syn supporting and rotating spindles, a work carrier ehronously to rotate said spindles, means to ro to convey work pieces to said spindles each of tate said grinding wheel, means to move said spindles simultaneously toward and from each 70 other to grip or release a work piece therebetween, v75 a wheel feeding mechanism arranged to feed the grinding wheel either toward or from the work, means including an electric solenoid to actuate said feeding mechanism to initiate an infeeding movement of the grinding wheel, and an electri which is operated by a separate ?uid motor, a main control valve in control of said grinding wheel and work carrier ?uid motors, an electric solenoid to actuate said valve to cause an infeed ing movement of the grinding wheel, a cycle timing valve controlled by said valve, said cycle timing valve being in control of said spindle ?uid motors. a cycle timing piston and cylinder opera 11 - 2,117,017 tively connected with said valves and arranged to control the grinding cycle, an electric switch as sociated with each of said_spindles, connections between said switches and spindles whereby the switches are actuated when the spindles are sep arated, and electrical connections connectingthe trip switches and solenoid'in series so as to pre vent actuation of the main control‘valve while the spindles are separated. - 8. An ‘automatic cylindrical grinding machine having a transversely movable rotatable grinding wheel, a pair of opposed axially aligned work sup porting and rotating spindles, a work carrier to convey work pieces to said spindles each of which is operated by a separate ?uid motor, a main control valve in control of said grinding wheel and work carrier ?uid motors, an electric sole noid to actuate said valve to cause an infeeding movement of the grinding wheel, a cycle timing valve controlled by said valve, said cycle timing valve being in control of said spindle ?uid motors, a cycle timing piston and cylinder operatively connected with said valves and arranged to con trol the grinding cycle, an electric switch associ 25 ated with said spindles, connections between said switch and spindles whereby the switch is actu ated when the spindles are separated, an electric switch which is actuated by said spindles, an elec tric switch actuated by said cycle timing piston 30 and cylinder, and electrical connections connect ing said ‘switches and solenoid in series with each other so as to prevent shifting of the main con trol valve and an infeeding movement of the grinding wheel when the work spindles are sepa 35 rated. and to convey the new work piece into axial alignment with the work spindles, and a main control valve operatively connected to control the admission of ?uid to the grinding wheel cylinder, the work spindle cylinders and the work carrier Cl cylinders so that the various elements are moved in timed relation with each other. 11. An automatic grinding machine compris ing a transversely movable rotatable grinding wheel, means including a piston and cylinder to 10 move said wheel transversely, a pair of opposed aligned rotatable ~work supporting spindles, means including an electric motor synchronously to rotate said spindles, a ?uid pressure piston and cylinder operatively connected to move each of said spindles, a work receiving hopper, a dis-_ charge chute, a pivotally mounted transversely movable work carrier having two work receiv ing pockets thereon, means including a piston and cylinder to move said carrier transversely 20 simultaneously to grip a new piece of work and a ground piece of work supported on said spin dles, means including a ?uid pressure piston and cylinder to rock said carrier simultaneously to convey the ground work piece to the discharge chute and to convey the new work piece into axial alignment with the work spindles, and con nections between said spindle cylinders and said work carrier cylinders whereby the rocking of the work carrier is interlocked withthe work 30 spindles so that the carrier is held against rock ing movement while the spindles are separated. 12. In an automatic cylindrical grinding. ma chine, a work loading device having a pivotally mounted transversely movable work carrier head 35 thereon, a pair of spaced work receiving pockets 9. An automatic cylindrical grindingv machine on said head, means including a ?uid pressure having a transversely’movable rotatable grinding - operated piston and cylinder to move said head wheel, a piston and cylinder to move said wheel transversely into an operating position, and in either direction, a pair of opposed aligned ro tatable work supporting spindles, means syn 40 chronously to rotate said spindles, means includ ing a ?uid pressure piston and cylinder opera tively connected to each of said spindles and ar ranged to move- the same toward and from each other to grip a work piece therebetween, a. piv otally mounted transversely movable work car rier, a hopper associated therewith, a ?uid pres sure piston and cylinder to movev said carrier transversely, a ?uid pressure piston and cylinder operatively connected to rock said carrier, a main means including a ?uid pressure piston and cyl 40 inder operatively connected thereafter to rock said work carrier head into a second operating position. . ' 13. In an automatic cylindrical grinding ma chine, a work loading device having a pivotally mounted, transversely movable work carrier head, a pair of spaced work receiving pockets on said head, means including a piston and cylinder'to move said head transversely into an operating position, means including 7 a second 50 piston and cylinder to rock said head into a sec 50 control valve operatively connected to control ond operating position, and ?uid pressure means I the admission of ?uid to said wheel feed cylin- - including a control valve mechanism “operatively der and said work carrier cylinders, and a cycle timing valve operatively connected with said main control valve and arranged to control the admission and exhaust of ?uid from said work connected to said cylinder so as to ?rst cause a transverse movement of said head, then a rock ing movement of said head, then a transverse movement of said head in the reverse direction, spindle cylinders. ’ ' 10. An automatic grinding machine compris-, and a rocking movement of said head in the op ing a‘ transversely movable rotatable grinding posite direction. ' 14. In an automatic cylindrical grinding ma wheel, means including a piston and cylinder to move said‘ wheel transversely, a pair of opposed chine having a pair of opposed axially aligned‘ aligned rotatable work supporting spindles, work supporting and rotating spindles, a work means including an electric motor synchronously hopper, a work loading device comprising a piv .to rotate said spindles, a fluid pressure piston and otally mounted transversely movable work head thereon having a pair of spaced work receiving 65 pockets simultaneously to grip an unground and charge chute, a pivotally mounted transversely a ground work ‘piece, a discharge chute, means movable work carrier having two work receiving including a-piston and cylinder to move said head pockets thereon, means including a piston and transversely simultaneously to grip an unground 70 cylinder to move said carrier transversely simul 70 taneously to grip a new piece of work and a work piece supported in said hopper and a ground work piece supported on said spindles, ground piece of work supported on said spindles, and means including apiston and cylinder to means including a ?uid pressure piston andcyl rock said head so as to shift the unground work inder to rock said carrier simultaneously to con piece into alignment with said spindles and to 75 vey the ground work piece to the discharge chute 75 65 cylinder operatively connected to move each of said spindles, a work receiving hopper, a dis 12 2,117,917 shift the ground work piece into said discharge chute. ' ' 15. In an automatic cylindrical grinding ma chine having a pair of opposed axially aligned work supporting and rotating spindles, means including a ?uid pressure piston and cylinder operatively connected to move said spindles to ward and from each other, a work hopper, a work loading mechanism comprising a pivotal 10 ly mounted transversely movable work carrier head, a pair of spaced work receiving pockets on said head, means including a piston and cyl~ inder to move said head transversely simultane ously to grip a new work piece supported in said hopper and a ground piece of work supported on said spindles, means including a piston and cylinder to rock said head so as to discharge the ground piece of work and to present a new piece of vwork into axial alignment with the work sup 20 porting spindles, and a hydraulic interlock be tween said spindle actuating cylinders and said work carrier rocking cylinder whereby said latter cylinder is rendered inoperative until the work spindles have separated to release a ground piece 25 of work. _ 16. In an automatic cylindrical grinding ma chine having a pair of opposed aligned work sup porting and rotating‘ spindles, a ?uid pressure piston and cylinder operatively connected to each 30 of said spindles and arrangedto cause them to approach or recede from each other, means syn chronously to rotate said spindles, a work hopper, a discharge chute, a work loading device compris ing a pivotally mounted transversely movable 35 work carrier head thereon, a pair of spaced work receiving pockets on said head, means including a piston and cylinder to move said head trans versely simultaneously to grip a work piece sup ported in said hopper and a ground piece of work supported on said spindles, means including a‘ 'piston and cylinder ‘to rock said head so as to simultaneously transfer said work pieces, and fluid pressure connections between one of said spindle cylinders and said work head rocking cylinder whereby said rocking cylinder is ren dered inoperative until said work spindles have moved to an inoperative position. ' ' 10 17. In an automatic cylindrical grinding ma chine, a pair ‘of opposed axially aligned work supporting and rotating spindles, means syn chronously to rotate said spindles, means includ ing a piston and cylinder to move each of said spindles toward and from each other, a work hopper, a discharge chute, a work loading device including a pivotally mounted transversely mov able work carrier head, means including a piston and cylinder‘ to rock said head so as to shift the 20 work pieces simultaneously into alignment with said spindles andsaid discharge chute respective ly, a main control valve to admit ?uid to said ?rst cylinder to move said work carrier head transversely, a cycle timing valve‘actuated by 25 said main control valve, connections between said cycle timing valve and said spindle actuating cylinders to control the movement of said spin dles in timed relation with the movement of said work head, and ?uid pressure connections be 30 tween one of said spindle cylinders and said work head rocking cylinder which are arranged to render said work head rocking cylinder‘ inoper ative until the work spindles have'separated and moved to an inoperative position. 35 HERBERT A. SILVEN.