US2010375A - Grinding machine - Google Patents

Description

A 1935. A. e. PLIMMER 2,010,375.

' GRINDING MACHINE I Filed May 3, 1932 4 Sheets-Sheet 1 Fig.1

1935- A. G. PLIMMER 2,010,375

GRINDING MACHINE Filed May 3, 1932 4 Sheets-Sheet 2 Fig.2

A. G. PLlM MER GRINDING MACHINE Aug. 6, 1935.

Filed May 5, 1932 4 Sheets-Sheet 3 W ALFREn GTUMMER Aug. 6, 1935. A, e. PLIM MER GRINDING MACHINE Filed May 5, 1932 4 Sheets-Sheet 4v m 9 F 0 1 .m F

\ o f lOZ qq Fig.1:

' ALFREDGFUMMER Fig.1l

Patented Aug. 6, 1935 UNITED. STATES PATENT OFFICE GRINDING MACHINE Application May 3, 1932, Serial No. 608,957

26 Claims.

This invention relates to improvements in machine tools and especially to improvements in grinding machines.

An object of the invention is the provision of 5 a machine tool for expeditiously grinding multiple diameter work pieces or shafts, such as armature shafts for electric motors, having a plurality of steps or individual diameters thereon.

Another object of the invention is the provision of improved means for insuring the accurate grinding of each step to its shoulder and insuring the'reduction of said diameters to the desired size throughout their length and especially at the shoulder.

A further object of the invention is the provision of improved means for aligning the control mechanism with the first or initial step or diameter of the work to insure successive steps or diameters of successive work pieces having the same relation to one another.

A still further object of the invention is the provision of a machine for accomplishing the above objects that is inexpensive to manufacture and simple to operate.

Other objects and advantages of the present invention should be readily apparent by reference to the following specification considered in conjunction with the accompanying drawings and it is to be understood that any modifications may be made in the exact structural details there shown and described within thescope of the appended claims without departing from or exceeding the spirit of the invention.

In the drawings:

Figure 1 is a front elevation of a grinding machine embodying the improvements of this invention.

Figure 2 is a top as seen in Figure 1.

Figure 3 is an end elevational view as seen from the right hand side of Figures 1 and 2.

Figure 4 is a. transverse sectional view through the machine showing the feeding or tool actuating mechanism as seen particularly from line 4-4 on Figure 1.

Figure .5 is a fragmentary enlarged sectional view ofa portion-of Figure 4 and particularly illustrating the valve actuating mechanism.

Figure 6 is an enlarged fragmentary sectional view of the locking mechanism of the adjusting device as seen particularly from line'66 of Figure 2.

Figure '7 is an elevational view of the cam and stop bars and parts actuated thereby as seen from line 1-1 on Figure 2.

plan view of the machine Figure 8 is a sectional view taken on line 8-8 of Figure 7.

Figure 9 is a sectionalview taken on line 9-9 of Figure '7.

Figure 10 is a sectional view taken on line 10-1 of Figure 'l.

Figure 11 is an enlarged sectional view through the hydraulic stop mechanism taken on linellll ofFigure 2.

Figure 12 is a plan view of a micrometer adjusting mechanism employed with the hydraulic stop mechanism as seen from line I2-l2 on Figure 11.

Figure 13 is a fragmentary view partly in elevation and partly in section as seen from line l3 l3 of Figure 2.

Figure 14 is a diagrammatic view illustrating the hydraulic circuits involved in this invention.

Throughout the several views of the drawings similar reference characters have been emp oy to denote the same or similar parts.

As mentioned above, the mechanism disclosed and described in this application has particular reference to a machine for successively operating on individual steps or portions of a work piece. Accordingly the machine may comprise a bed 15 having formed on the upper surface thereof ways It for guiding the work supporting table ll during its movement relative thereto. The table ll supports at opposite ends thereof a self-contained head stock [8 and a tail stock 19 having projecting therefrom suitable centers for supporting a 'work piece 20 therebetween. Opposed to the work is a grinding wheel 21 for operation on the individual steps or diameters of thework 20. In order to align the grinding wheel 21 with said individual steps or diameters of the work either the grinding wheel or the work supporting table is axially adjusted relative to the other. For 40 this purpose there is provided a hand wheel 22 rotatably .iournaled in the forward face of the bed IS.

The bed I5 has projecting from its rear surface the extension 23 having formed on the upper surface thereof guideways 24 for a carriage or support 25 in which is rotatably journaled a spindle 26. The spindle 26 has secured to it the grinding wheel 21 for rotation with one another and the carriage further supports a hood or 50 guard 21 which substantially encloses the grinding wheel 2| for confining the coolant usual with machines of this type. In order to feed the grinding wheel and work relative to one another either the grinding wheel or the work is actuated toward the axis of the other. In the drawings the mechanism for moving the grinding wheel is disclosed, for which purpose a cross feed or adjusting screw 28 is provided having its threaded end in threaded engagement with a nut 29 secured in a web 30 integral with the carriage 25. In-, termediate the ends the screw 28 is provided with a splined portion 3! in splined sliding engagement with the sleeve 32 of a gear 33. The sleeve 32 is rotatably journaled in a bearing provided by a housing 34 secured to the rear wall of the bed extension 23. Meshing with the gear 33 is a pinion 35 of a compound gear at loosely journaled on a stud 31 carried by the housing 341. The large gear 38 of the compound gear 36 meshes with a pinion 39 keyed or otherwise secured to the end of a transverse shaft it. The shaft 68- is journaled at its rear end in the housing 3 3 and at its forward end in a feed box ii secured to the forward face of the bed I15. Journaled within the feed box Mis a transmission and micrometer adjusting mechanism t? which terminate respectively in a ratchet Q3 and micrometer crank or hand wheel M. These structures are usual with,

grinding machines whereby manual actuation of the hand crank id manually rotates the screw 23 for actuating the grinding wheel in opposite directions relative to the work, while the ratchet (it is power actuated through the usual pick feed mechanism for actuating the grinding wheel toward the work.

The housing 36 on the rear of the bed extension 23 is closed by a cover plate 65 to which in turn is secured a cylinder it having enclosed therein a piston (ll adapted to be hydraulically actuated axially of the said cylinder. Projecting from the piston Q? is a piston rod 38 having its inner end secured to a cross head 419. The cross head 39 has rotatably journaled in its other end the rear end of the screw 28 whereby said screw may be rotated independently of the cross head 69 and whereby axial movement of the cross head 39 correspondingly axially adjusts the screw 253 for carrying with it thejcarriage 25.

As shown diagrammatically in Figure 14, the cylinder flit has terminating at its opposite ends one end of pipes t and Bi whose other ends respectively terminate at ports 52 and 53 formed within a valve sleeve 54. The valve sleeve 56 is provided intermediate the ports 52 and 58 with a port 55 forming one terminus for a pressure line or pipe 56 which extends from a-pump 5?. The pump 5?! draws an hydraulic medium, preferably oil, through a suction pipe 53 from a tank or sump 5t and discharges same under pressure into the conduit or line 55. Placed in the line 56 is a relief valve 60 connected by a conduit iii to the tank 59 for spilling excess oil discharged by the Pump 5.11 back into the tank The sleeve 56 is provided with additional ports E52 and 63 with which is connected one end of branch discharge conduits tl and 65, each connecting with a common discharge line 66 that terminates in the tank or sump 59 for returning the used or spent hydraulic medium to the tank. Enclosed within the sleeve 5d is a piston type valve 57 having formed therein cannelures fit and 639 respectively employed for alternately connecting the pressure in the line 56 with the lines 50 and (if? thereby actuating the piston till in opposite directions relative to the cylinder 46.

As shown in Figure 14, the cannelure is connecting the ports 53 and 55 for connecting presand, through the cross head 49, actuating the grinding wheel toward the work. At this time the cannelure Wis connecting the ports 52 and 62 for connecting the spent or exhaust hydraulic medium in the line 5| with the branch discharge line (it and main discharge line 66 for returning the hydraulic medium to the tank or sump 59. Actuation of the valve 61 to the left, as seen in Figure 14, will connect the pressure port 55 with port 52 through the cannelure 69, while the cannelure 68 connects the port 53 with branch exhaust or discharge port 53 thereby actuating the piston ll to the left for retracting, the grinding wheel from the'work.

In actual practice the cylinder head in on the right hand end of cylinder 66, as seen in Figure 4, forms the limit of movement of the piston ll to the right, while the left hand limit of movement of the piston is variably determined by means of adjustable stops which are in alignment with the particular step or diameter of the Work piece adapted to be operated on. For this reason the cross head d9 has formed therein the axial opening H through which extends a stop block 172. The stop block 172 is supported on opposite ends by rollers l3 and i l journaled in the bracket cover 415. As seen in Figure 2, the stop block l2 has mounted therein a plurality of stop pins 15 each projecting a definite amount from the face of the block i2 depending upon the particular diameter of the work with which it is aligned. As shown in Figure 2, the steps or diameters of the work from left to right gradually increase until the step 2% is reached whereupon the steps of the work gradually decrease. Accordingly the pins 75 from left to right each project beyond the preceding one an amount equal to the difference in radii between the successive' steps of the work until the pin 75:; is ent r countered. From pin 115a on the pins gradually recede an amount equal to the difference in radii of the work portions on the right hand side of the diameter 2th of the work.

From this it will be seen that the grinding wheel and its carriage when actuated by the hydraulic piston 41? cannot inadvertently engage with the work or gouge same since the grinding wheel would be stopped before contact of the work and the wheel. Through mechanism to be subsequently described the stop bar 772 is actuated in unison with the longitudinal travelof the work table H thereby at all times keeping the work diameters and the stop pins in step.

In order to actuate the valve 67 it has projecting from it a valve stem it having formed intermediate its ends a circumferential groove ll receiving a pin iii projecting from the upper end of a crank or lever 79. The lever 79 is journaled on a sleeve {iii encircling the reduced extension Bi of the transverse shaft it. The sleeve 89 is formed on one end with a collar $2 which lies adjacent a collar 83 formed on the pinion 39. The collar 83 has projecting from it a pin 8G adapted to engage with a pin 85 having its axis disposed at right angles to the axis of the pin 80 and carried by the sleeve collar 82. As shown in Figure 5, the crank arm 79 has one surface abutting the adjacent surface of the sleeve collar 92 and has contacting with it on its other surface a friction washer 86 against which abuts one end of a spring 8? compressed a desired amount by a nut 88 threaded on the end of the sleeve 80. From this it will be seen that the crank '59 is frictionally held between the sleeve collar 82 and the friction washer 8t.

.ance between the diameter or step of the work dseired to be ground and the grinding wheel for which purpose the stop pins 15 are properly adjusted. Asseen from the left hand end of Figure 5, rotation of the shaft 49 in a counterclockwise direction will cause the pin 84 to leave the pin without shifting or moving it. This free movement of the pin 84 would continue until the shaft 49 has made substantially one complete revolution whereupon the pin 84 would engage with the pin 85 at a point diametrically opposed to the point of contact illustrated in Figure 5 and would thereby cause the rotation of the collar 82 and sleeve 89 in unison therewith. This movement of the collar 82 due to the frictional engagement with the crank 19 actuates said crank correspondingly and thereby shifts the valve 69 to its other extreme position from that shown 'in Figure 14. The actuation of the shaft 49 in a counterclockwise direction causes a retraction of grinding wheel 25 by means of the piston 41. The

shifting of the valve 91 to the left, as seen in Figure 14, compressed the "spring 89 that encircles a reduced extending portion'99 of the valve 61. The spring 89 abuts on one end with the sleeve 54 and on the other end with lock nuts 9| carried by the valve extension.99. From this it will be seen that reverse or clockwise actuation of the shaft 49 will cause the pin 84 to again immediately leave the pin 85 but this will relieve the tension on the spring 89 so that the said spring immediately expands and shifts the valve 61 to the position shown in Figure 14 thereby again connecting the hydraulic medium with the side of the piston 41 for feeding same toward the grinding wheel. This movement of the grinding wheel continues until engagement with the stop pins 15. However, at this time the ratchet wheel 43 has made but a partial revolution in a feeding direction so that a substantial clearance exists between the work and the grinding wheel 'which is taken up in the usual manner either by manually actuating the mechanism through the hand crank 44 or automatically through the power ratchet 43.

Actual contact with the stop pins 15 is had by a pin 92 carried by the cross'head 49 in axial alignment with the piston rod 48. The pins 15 in order to accurately position the grinding wheel relative to the work are adapted to be axially adjusted as respects the block 12. For this purpose the blook 12 is provided with as many perforations 93 as stop pins 15 are employed. Extending at right angles to the axis of the perforations 93 is a passage or way 194 in which is disposed a wedge having a perpendicular or fiat surface 96 abutting one end of the pin 15 and having a wedge surface 91 contacting with a correspondingly inclined surface .98 of the way 94.' The wedge 95 ispinned or otherwise secured at its upper end to a carrier 99 journaled at one end to a screw I99 which is threaded into the block 12. To prevent inadvertent movement of the wedge 95 the head of the screw is provided with a plurality of notches I9I co -operating with the point I92 of a spring pressed detent I93 mounted in the wedge carrier 99.

From the foregoing it will be noted that actuation of the screw I99 in a given direction will raise or lower the wedge 95 relative to the way 94 thereby through the engagement of the wedge surfaces 91 and 98 shifting the perpendicular or flat surface 96 toward or away from the end of the stop pins 15 and accurately axially positioning said pins relative to the perforations 93. In order to hold the pins in adjusted positions and to maintain firm contact between the rear end of the pins 15 and the flat face 96 of the wedge .95, they are provided intermediate their ends with circumferential grooves I94 having the sides inclined and co-operating with the-cam or wedge point of clamp screw I95, as will be evident from the disclosure in Figure 11.

The. stop block 12 has projecting from one end thereof a rack bar I95 slidably supported by a bracket I91 secured as by screws I98 to the lateral side of the bed extension 23, as 'seen particularly in Figure 3. Meshing with the rack bar I96 is a rack pinion or gear I99 secured to a shaft II9 journaled in the bracket I91. Carried by the shaft II9 adjacent the gear I99 is a sprocket III about which is trained a sprocket chain H2 in turn passing over a sprocket II3 on one end of a shaft I I4. The shaft H4 is journaled at its rear end in a bearing H5 at the upper end of the bracket I91 and extends transversely of the bed extension 23 and is journaled at its forward end in a bracket H6. The bracket II 6 is secured in any desirable manner, such as by cap screws I I1, to the rear surface of the bed I5, and as shown in Figure 2, is arranged just to theright of the bed extension 23.

The shaft I I4 has secured to its forward end a rack pinion I I8 meshing with a vertical rack bar H9 having on its lower end a head I29 provided 5 with cam faces I21 and I22 on opposite ends thereof. The bar H9 is guided in its vertical movement by means of rollers I23 and I24 mounted on opposite sides of the bar I I9 and ournaled in the bracket II 6. The head I29 rides on the to the length of the steps or portions of the work, :A'

but the difference in height between the faces I25a is uniform regardless of the differences in diameters between the successive portions of the work. It will further be noted that the faces I-25a continue to ascend even beyond the portion 29a of the work for successively advancing the stop block 12 to align the several stop pins with the cross head. This is employed even though there may be portions or steps on each side of the portion 29a of the work of the same diameter because due to a slight misalignment of the parts of the machine one diameter may be reduced to the same size while the other will be slightly above or below the desired size if the same stop pin were employed, whereas by using independent stop pins independently and individually adjusted, the size of each portion of the work can be accurately controlled. By reference to Figure '7 it will be seen that each stop I25a of ,the cam bar I25 is connected by an inclined rise I26, which cooperates with the cams I2I and I22 of the shoe I29 for raising the rack bar II9 as it is traversed from one end thereof to the next. To maintain contact between the shoe I29 and the. steps I25a, the rack bar II9 has abutting on its upper end one end of a spring I 2I which abu'ts'on itsother end with a plug l26;',closing' the aperture in'fwhich the's'pri'ng I2 i' is d'ispos'ed.

Secured tdihebar l25jisQa, second. cam bar I29 which in contour many steps or faces I30 as. there are steps of faces I 2.5dom'the.

bar I25 and stepsor individualportions ofihe. work. 1 The steps I3I'i while of. th e same length as the steps I25d from the top of ,oneriseIZS to the top of the next rise, which, as was noted above, is equal to the length of the step or portion of the work,iis offset or spaced-equally throughout regardless of the difference in diameters of the several portions of the work. Riding on the steps I39 is a shoe I3I having pro- J'ecting from opposite vertical faces thereof hardened abutment screws I 52 which are adapted to contact with the vertical shoulders I 53v provided between successive steps I39 of the bari29. The shoe I3I is integral with a. slide I5 3 which is guided by the bracket II5 and connected at its upper end by means of a stud I35 to a piston I35 enclosed within a cylinder I31 secured in any desirable manner to the bracket H6. Connecting with the cylinder I37 at its lower end is a conduit or line I38, see Figure 14, which is an extension of the line 5I so that the piston I36 is actuated axially at the same time that the piston 47 is actuated to retract the grinding wheel from the work. By this'construction, and since the work is actuated from diameter to diameter onlywhen the grinding wheel is retracted, the shoe I3I is raised free of the shoulders I I3 before .axial adjustment thereof. To return the shoe I3I to the cam bar I29, the stud I35 has secured to it one end of a spring I39 which has its other end secured to a pin M0 projecting from the cylinder I37.

clockwise direction, as seen in Figure '7, or in a clockwise direction, as seen in Figure 2, thereby wrapping the flexible cable I42 around the pulley or drum MI and raising the weight IE3 so that upon reverse actuation of the table the counterweight I43 tends to unwind the cable I42 and as the shoe I20 passes from one step I25a, to the next in a declining direction, the stop block I2 is shifted to its normal or starting position, as shown in Figure 2. g

In practice the work is supported on centers I44 and I45 respectively projecting from the,

head stock I8 and tail stock I9 being received in center bores formed in the ends of the work. It has been found that frequently the center bores are not uniform thereby permitting the centers I 44 and I45 to more or less enter the work. thereby varying the position of the work as respects the grinding wheel, since this variation thefgrinding wheel and with the vertical should'ers I33 of the bar I29, the bars I25 and I29 are mounted inbrackets or supports I46 and I4? secured to the. rear surface of the bed I5 for limited axial movement -relative',thereto. The bracket MB, seeiFigure '13,'to which the bars I25 I 29 are secured is provided with an aperhire or socket I59 receiving the end I59 of a lever I iii. The lever I5I,,see Figure 2, is bent at right. angles, lying partially along, the front of the work table it and partially along the side thereof. The portion extending along the side of the table has passing therethrough a pivot I52 which enters the bracket I53 carried by the table Ill. The end or portion of the lever I5I paralleling the front of the table terminates in a spring pressed locking mechanism indicated generally by the numeral I55 for locking the lever in any position of adjustment about the axis of the pivot pin I52. By reference to Figure 2, it will be noted that'if the locking mechanism I55, which also constitutes the operating handle were actuated toward the table, the lever would rotate in a clockwise direction about the pivot I52 and thereby axially slide the bars I25 and I 23 to the right and reverse actuation of the handle I5 3 will reversely axially adjust the position of the said bars.

To accurately align the said bars I25 and I29 with the work, the grinding wheel hood 21 has pivoted thereto as at I55 a right angle lever I56. Secured to the lever is one end of a spring I57, the other end being secured or anchored at I58 to the side of the hood 21 for normally holding the said lever in elevated position. A stop pin I55 pfojects from the said hood for limiting the movement of the lever I56 under the influence of the spring I51. The lower end of the lever has secured thereto or formed integral therewith a shoe I55 adapted to rest on the surface of the work. The end of the shoe I60 is in exact alignment with the face of the wheel that engages the shoulder between one diameter or portion of the work and the next so that the table supporting the work is actuated until the end representing the grinding wheel engages with the said shoulder. With the parts in this position, the shoulder stop shoe I3I is resting on the step I30 of the bar I29 and unless the bar is aligned with the work the stop pin I2I or I22 will be spaced from the vertical shoulder I33 so that actuation of the lever I5I through the operating handle and locking mechanism I54 will bring the said shoulder I33 in contact with the stop screw I2I thereby accurately aligning the bars I25 and I29 with the work and insuring successive portions of the work being ground to the desired dimension as respects the desired length. as the axial traverse of the work will be limited by engagement of the stop screw I2I and the shoulder I33.

The locking mechanism I54 comprises a knob member IBI in which is slidably mountedaplunger I62 and spring I63 abutting on one end with the plunger and on the other end with the base of the bore in which it is mounted. Extending through the spring is a pin I64 carrying a dog I65 adapted to be received between the teeth formed in a bracket I66 secured to'the forward face of the table I]. The operation of this type of a locking mechanism is well understood.

The operation of the machine is as follows: The

hand crank 44 is actuated 'in a grinding wheel reing the first step or diameter of the work with the grinding wheel. The arm I58 is then actuated to bring the shoe carried thereby into contact with the work whereupon the table I1 is of the wheel. The grinding wheel is then fed toward the work through the,actuation of the hand wheel or crank 44. This movement of the hand wheel permits the shifting of the valve to the position for connecting the hydraulic medium to the other end of the cylinder 46 whereupon the carriage 35 plunges toward the work until engagement of the contact pin 92 of the cross head 49 with the proper aligned stop pin I5. The lever II is then actuated through the locking and control member I54 for shifting the bars I25 and I29 until engagement is had between the vertical shoulder I33 of the bar I29 and the stop pin I32 of the shoe I3I. It will be understood that this axial adjustment of the bars I25 and I29 is not of a great amount since it is Only necessary to compensate for the difference in the center bores in the Opposite ends of the work. With the parts thus adjusted the grinding wheel -is fed into the work either manually or automatically as is the usual practice until the work is reduced to the desired size.

As soon as the first diameter or portion of the i work is reduced to the desired size, the hand crank is actuated in a grinding wheel retracting direction, which after a complete revolution of the hand wheel shifts the valve 61 for connecting the hydraulic pressure with the cylinder 46 to further retract the grinding wheel. This shifting of the valve 61 also connects the hydraulic pressure with the piston I36 thereby raising the shoulder stop shoe I3I away from the bar I25 so that'upon axial adjustment of the work relative to the wheel no interference is had by the vertical shoulders I33. As soon as the next portion of the work is aligned with the grinding wheel the hand crank 44 is actuated in a feeding direction thereby immediately connecting the hydraulic pressure for rapidly shifting the grinding wheel toward the work. The operation above described is then repeated except as to alignment of the bars I25 and I29 with the work. This adjustment is made only at the commencement of a new work piece because the individual I steps or portions of the work will thereafter be kept in line.

What is claimed is:

1. In a grinding machine of the class described the combination of a bed, a grinding wheel carriage mounted thereon for movement transversely thereof, a grinding wheel r'otatably supported by the carriage, a multiple diameter work piece support carried by the bed for translation relative thereto across the operative face of the grinding wheel, means for actuating the work and grinding wheel toward and from one another, means for stopping the movement of the'grinding wheel just before it contacts with the work including a stop bar having a plurality of stop pins mounted therein one foreach diameter of the work, and

means coupling the work support and stop bar whereby movement of the work support si .lultaneously shifts the stop bar thereby keeping th work and stop bar in step. I

2. In agrinding machine for grinding the individual portions of a multiple diameter work piece the combination of a work support, a grinding wheel actuable toward and from the work, a stop pin for each diameter of the work for limiting the approach of the grinding wheel to the particular diameter with which it is aligned, and means for simultaneously shifting the work support and stop pins in the same direction, including a cam bar having a plurality of cam surfacesthereon, a rack slide actuated by said cam surfaces, and an operative connection between the rack slide and stop pins.

In a grinding machine for grinding multiple diameter work pieces the combination of a bed, a grinding wheel mounted thereon for movement transversely thereof, a work support carried by the bed for translation relative thereto, means carried by the bed for stopping the movement of the grinding wheel relative to the work; means for limiting the translation of the work support for limiting the axial relative movement between the work and grinding wheel, means for varying the stopping and limiting means in each direction, and additional means for positioning said stopping and limiting means with each work piece prior to the operation of the machine.

4. In a grinding machine of the class described for grinding individual portions of a work piece the combination of. a bed, a grinding wheel carriage mounted thereon for movement relative thereto, a work support carried by the bed fortranslation relative thereto and for supporting a multiple diameter work piece adapted to have its individual portions aligned with the grinding wheel, said portions of the work each terminating in a shoulder, means for limiting the axial traverse of the work and grinding wheel to align each shoulder with the edge of the grinding wheel, and means for. adjusting said traverse limiting means with each work piece prior to the operation of the machine.

5. In a grinding machine of the class described .for grinding individual portions of a multiple di-.

ameter work piece the. combination of a bed, a grinding wheel mounted thereon for movement relative thereto, a work support mounted on the bed for translation relative thereto and for traversing a multiple diameter work piece supported thereby relative to the grinding wheel, each portion of the work terminating in a shoulder adapted to be aligned with the adjacent edge of the grinding'wheel, means for limiting the transverse shifting of the grinding wheel toward the work comprising a plurality of stop pins each individual to a diameter of the work, means for limiting the traverse of the work with respect to thewheel, means for positioning said traverse limiting means in accordance with the position of each work piece as it is placed on the work support and prior to the operation of the machine.

6. In a grinding machine of the class described for grinding individual portions of a multiple diameter workpiece the combination of a bed, a grinding wheel mounted thereon for movement relative thereto, a work support mounted on the comprising a plurality of. stop pins each individual toa diameter oflthework, means for limitbed for translation relative thereto and for traing the traverse of the work with respect to the wheel, and means for positioning successive stop pins relative to the grinding wheel as the work is traversed relative thereto including a cam bar having a. plurality of steps thereon corresponding to the number of steps on the work, means for securing the cam bar to the work support for movement therewith, and. an operative coupling between the cam bar and stops whereby movement of the cam bar shifts the position of the stops.

'7. in a grinding machine of the class described for grinding individual portions of a multiple diameter work piece the combination of a bed, a grinding wheel mounted thereon for movement relative thereto, a work support mounted on the bed for translation relative thereto and for traversing a multiple diameterwork piece supported thereby relative to the grinding wheel, each portion of the work terminating in a shoulder adapted to be aligned with the adjacent edge of the grinding wheel, means for limiting the transverse shifting of the grinding wheel toward the work comprising a plurality of stop pins each individual to a diameter of the work, and means for limiting the traverse of the work with respect to the wheel, said means comprising a cam bar having a plurality of steps thereon corresponding to the number of steps on the work, each step having a vertical shoulder at the end thereof, means for securing the cam bar to the work support for movement therewith, and means riding on the step of the cam bar representing the portion of the work being ground for engagement with the shoulder to limit the traverse of the work.

8. In a grinding machine of the class described for grinding individual portions of a multiple diameter work piece the combination of a bed, a grinding wheel mounted thereon for movement relative thereto, a work support mounted on the bed for translation relative thereto and for traversing a multiple diameter work piece supported thereby relative to the grinding wheel, each portion of the work terminating in a shoulder adapted to be aligned with the adjacent edge of the grinding wheel, means for limiting the transverse shiiting of the grinding wheel toward the work comprising a plurality of stop pins each individual to adiameter of the-work, means for limiting the traverse of the work with respect to the wheel, said means comprising a cam bar having a plurality of steps thereon corresponding to the numberof steps on the work, each step having a vertical shoulder at the end thereof, means for securing the cam bar to the work support ior movement therewith, means riding on the step of the cam bar representing the portion of the work being ground for engagement with the shoulder to limit the traverse of the work, and means for raising said limiting means riding on the cam bar step for raising it therefrom prior to the traverse of the work from one step to the next.

9. In a grinding machine the combuggion of,

by the work support for adjusting the position of the stop pins and thereby varying the approach of the grinding wheel and work support, and

meansindividual to each stop pin for very minutely adjusting its position.

10. Ina grinding machine of the class described for grinding individual diameters of a multiple diameter shaft the combination with a bed, a grinding wheel mounted thereon for transverse m'ovement relative thereto, means for eiiecting the said movement of the grinding wheel in reverse directions and a work support carried by the bed for translation relative thereto and to the grinding wheel, of means for limiting said translatory movement of the work support to lim- 'it the approach of the grinding wheel to the movement relative thereto, a work. support carried by the bed for translation relative thereto and to the grinding wheel, of means for limiting said translatory movement of the work support to limit the approach of the grinding wheel to the shoulder between each pair of diameters of the Work, said means comprising a cam bar having a plurality of shoulders thereon each representative of a shoulder on the work, a shoe carried by the bed riding on the cam face representative of the work being operated upon by the grinding wheel and engaging the shoulder at the end thereof simultaneously with the engagement of the side of the grinding wheel with the shoulder of the work, and means disassociating the shoe and cam face prior to the translation of the work to align the next portion thereof with the grinding wheel.

12. In a grinding machine of the class described for grinding individual diameters of a, multiple diameter shaft the combination with a bed, a

sentative of a shoulder on the work, a shoe carried by the bed riding on the cam face representative of the work being operated upon by the grinding wheel and engaging the shoulder at the end thereof simultaneously with the engagement of the side of the grinding wheel with the shoulder of the work, means disassociating the shoe and the cam face prior to the translation of the work to align the next portion thereof with the grinding wheel, and means for initially aligning the cam bar and work with the grinding wheel including a gauge associated with the grinding wheel and co-operating with 'the shoulder on the work, and means shifting the cam bar relative to the work support.

13. In a grinding machine of the class described for grinding individual portions of a multiple .portioned work piece, the combination of a bed,

a grinding wheel mounted thereon for movement relative thereto, a work support on the bed movable in a direction transversely to the movement of the grinding wheel, hydraulic means for eiiecting the movement of the grinding wheel, means for limiting the movement or the work support to align the individual portions of a. work piece thereon with the grinding wheel, and hydraulic means for rendering the limiting means inoperative prior to the alignment of successive portions of the work with the wheel.

14. In a grinding machine of the class described for grinding individual portions of a multiple portioned work piece, the combination of a bed, a grinding wheel mounted thereon for movement relative thereto, a work support on the bed movable in a direction transversely to the movement of the grinding wheel, hydraulic means for effecting the movement of the grinding wheel, means for limiting the movement of the work support to align the individual portions thereof with the grinding wheel, hydraulic means for rendering the limiting means inoperative prior to the alignment'of successive portions of the work with the wheel, and a connection between the hydraulic wheel shifting means and the hydraulic means for limiting the movement of the work whereby they are actuated simultaneously.

'15. In a grinding machine of the class described for grinding individual portions of a multiple portioned work piece, 'the combination of a bed, a grinding wheel mounted thereon for movement relative thereto, a work support on the bed movable in a direction transversely to the movement of the grinding wheel, hydraulic means for effecting the movement of the grinding wheel, means for limiting the movement of the work support to align the individual portions thereof with the grinding wheel, hydraulic means for rendering the limiting means inoperative prior to the alignment of successive portions of the work with the wheel, a connection between the hydraulic wheel shifting means and the hydraulic means for limiting the movement of the work whereby they are actuated simultaneously, and yielding means for again rendering the limiting means operative.

16. In a grinding machine for grinding successive portions of a work piece the combination of a bed, a grinding wheel mounted thereon for operation on each portion of the work, a work support on the bed for translation relative thereto transversely of the grinding wheel, and means for limiting the said translation of the work to accurately align the different portions oi! the work with the wheel comprising a bar having a plurality of shouldered stops thereon and corresponding to thg, number of portions on the work, means on the table for supporting the stop bar for translation therewith, a stop member carried by the bed cooperating with the stop bar and adapted to engage the shouldered stops thereon, and yielding means for holding the stop member in engagement with the shouldered stop bar.

17. In a grinding machine for grinding successive portions of a work piece the combination of a bed, a grinding wheel mounted thereon for operation on each portion of the work, a work support on the bed for translation relative thereto transversely of the grinding wheel, and means for limiting the said translation of the work to accurately align the different portions of the work with the wheel comprising a bar having a plurality of shoulderedstops thereon and corresponding to the number of portions on the work, means on the table for supporting the stop bar for translation therewith, a stop member carried by the bed cooperating with the stop bar and adapted to engage the shouldered stops thereon, yielding means for holding the stop member in engagement with the shouldered stop bar, and hydraulic means operable against the resistance of the yielding means for rendering the stop member inoperative.

18. In a grinding machine for grinding successive portions of a work piece the combination of work with the wheel comprising a bar having a plurality of shouldered stops thereon and corresponding to the number of portions on the work, means on the table for supporting the stop bar for translation therewith, a stop member carried by the bed cooperating with the stop bar and adapted to engage the shouldered stops thereon, yielding means for holding the stop member in engagement with the shouldered stop bar, hydraulic means operable against the resistance of the yielding means for rendering the stop member inoperative, and means for shifting the shouldered stop bar relative to the bed to align the shouldered stops thereon with the work in accordance with the relation of the work to the wheel.

19. In a grinding machine 'for grinding individual diameters of a multiple diameter work 1 piece, the combination of a bed, a grinding wheel mounted thereon for movement relative thereto, a work support on the bed ionmovement relative thereto transversely of the direction of movement of the grinding wheel and means for limiting the approach of the grinding wheel to each diameter of the work comprising a plurality of stop pins one for each diameter of the work, a slide for the pins movable in the same direction as the work table, a cam bar on the table having as many cam faces as there are diameters on the work, and a transmission mechanism between the cam bar and stop pins slide whereby the work table and stop pins slide are simultaneously shifted to suecessively position the stop pins in operative relation with the grinding wheel as the different diameters of .the work are aligned therewith.

20. In a grinding machine for grinding individual diameters of a multiple diameter work piece, the combination of a bed, a grinding wheel mounted thereon for movement relative thereto, a work support on the bed for movement relative thereto transversely of the direction of movement of the grinding wheel and means for'limiting the approach of the grinding wheel to each diameter of the work comprising a plurality of stop pins one for each diameter of the work, a slide for the pins movable in the same direction as the work table, a cam bar on the table having as many cam faces as there are diameters on the work, a transmission mechanism between the cam bar and stop pins. slide whereby the work table and stop pins slide are simultaneously shifted to successively position the stop pins in operative relation with the grinding wheel as the difierent diameters of the work are aligned therewith; said transmission including a cam follower, and yielding means maintaining contact between the cam inf 8 of the grindingwheel and for limiting the approach of the grindingwheel to eachdiameter of the work comprising a plurality of stoppins one the work table in accordance'with the alignment of the work with the grinding wheel;

22. ,In a grinding machine for grinding individual diameters of a multiple diameter work piece, the combination of a bed, a grinding wheel mounted thereon for movement relative thereto, a work support on the bed for movement relative thereto transversely of the direction of movement of the grinding wheel and means for limiting the approach of the grinding wheel to each diameter of the work comprising a plurality of stop pins one for each diameter of the work, a slide for the pins movable in the same direction as the work table, a cam bar on the table having as many cam faces are there are diameters on the work, a transmission mechanism between the cam bar and stop pins slide whereby the work table and stop pins slide are simultaneously shifted to successively position the stop pins in operative relation with the grindingwheel as the different diameters of the work are aligned therewith, means for initially positioning the cam bar with respect to the work table in accordance with the alignment of the work with the grinding wheel,

and gauge means for initially positioning the work with respect to the wheel.

23. In a grinding machine for grinding individual diameters of a multiple diameter work piece, the combination of a bed, a grinding wheel mounted thereon for movement relative thereto, a work support on the bed for movement relative thereto transversely of the direction of movement of the grinding wheel and means for limiting the approach of the grinding wheel to each diameter,

, of the work comprising a plurality of stop pins one for each diameter of the work, a slide for the pins movable in the same directipn a s the work table, a cambar on the table having asfimany cam faces as there are diameters on the work, a transmission mechanism between the cam bar and stop pins slide whereby the work table and stop pins slide are simultaneously shifted to successively position the stop pins in operative relation with the grinding wheel as the different diameters of the work are aligned therewith, and means for positioning successive diameters of the Work piece with the wheel.

24. In a grinding machine for grinding individual diameters of a multiple diameter work piece, the combination of a bed, a grinding wheel mounted thereon for movement relative thereto, a work support on the bed for movement relative thereto transversely of the direction of movement of the grinding wheel and means for limiting the approach of the grinding wheel to each diameter of the work comprising a plurality of stop pins one for each diameter of the work, a slide for the pins movable in the same direction as the work table, a cam bar on the table having as many cam faces as there are abide-15 diameters on the work, and a transmission mechanism""between' the cam bar an'dstop pins slide whereby..thework=. table and stop pins slideare simpltap'eous'ly s'hifted'to successively position the stop'pins in operativ relation with the'grinding wheeljalsthe diiferent diameters of the workare therewith, means forfpositioni ng" successiile' diameters' of the work piece with. the wheel i udi ash de stor a ha gi y shou tiered-stops thrjgfijas there'are diameters rn'e-iwork'piece, and cam faces .on the can; bar. a cam follower on the bed cooperating with the stop bar, and yielding-means forimaintaining contact betweenthe follower and stop bar.

25. In a grindin'g machine for grinding individual diameters of a multiplediameter work piece, the combination of a bed, a grinding wheel mounted thereon for movement relative thereto, a work support on the bed for movement relative thereto transversely of the direction of movement of the grinding wheel and means for limiting the approach of the grinding wheel to each diameter of the work comprising a plurality of stop pins one for each diameter of the work, a slide for the pins movable in the same, direction as the work table, a cam bar on the table having as many cam faces as there are diameters on the work, a transmission mechanism between the cam bar and stop pins slide whereby the work table and stop pins slide are simultaneously shifted to successively position the stop pins inoperative relation with the grinding wheel as the different diameters of the work are aligned therewith, means for positioning successive diameters of the work piece with the wheel including a shouldered stop bar having as many shouldered stops thereon as there are diameters on the work piece and-cam faces on the cam bar, a cam follower on the bed cooperating with the stop bar, yielding means for maintaining contact between the follower and stop bar, and hydraulic means for rendering said yielding means inoperative.

26. In a grinding machine for grinding individual diameters of a multiple diameter work piece, the combination of a bed, a grinding wheel mounted thereon for movement relative thereto, a work support on the bed for movement relative thereto transversely of the direction of movement of the grinding wheel and means for limiting the approach of the grinding wheel to each diameter of the work comprising a plurality of stoppins one for each diameter of the work, a slide for the pins movable in the same direction as the work tabs, a cam bar on the table having as many cam faces as there are diameters on the work, a transmission mechanism between the cam bar and stop pins slide whereby the work table and stop pins slide are simultaneously shifted to successively position the stop pins in operative relation with the grinding wheel as the different diameters of the work are aligned therewith, means for positioning successive diameters of the work piece with the wheel including a shouldered stop bar having as many shouldered stops thereon as there are diameters on the work piece, and cam faces on the cam bar, a cam follower on the bed cooperating with the stop bar, yielding means for maintaining contact between the follower and stop bar, hydraulic means for effecting the movement of the grinding wheel, hydraulic means for rendering the stop bar follower inoperative, and a connection be-- tween the said hydraulic means whereby they are simultaneously operable.

ALFRED G. PLIMMER.

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