US2086052A - Grinding machine - Google Patents

Description

July 6, 1937. H A S|| VEN 2,086,052

GRINDING MACHINE Filed June 2e, 195e 5 sheets-sheet 1.

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@www 1 July 6, 1937. H. A. `SILVEN 2,086,052

GRINDING MACHINE Filed June 2e, 195e s sheets-sheet 2 14 iig-113 /IG. i 145l L|`\6'7 5' 6,3

I 70 57 8g 7 12.3 120 l H5 im E July 6, 1937. H, A, slLvEN l 2,086,052

GRINDING MACHINE Filed\ June 26, 1936 3 Sheets-Sheet 3 233 [25 215 220 22H5 12 Z Hg. 72] I4:

" llil 27 175 2 205170 21g:L9 L 1172 l@ Z5 1J 174 J Hg 225 2117 22H 3H 57 35 32 Patented July 6, 1937 UNITED STATES 2,086,052 i" GnrNDING MACHINE Herbert A. Silven, Worcester, Mass., assignor to Norton Company, Worcester, Mass., a corporation of Massachusetts Application June 26, 1936, serial No. 87,512L

16 Claims.

This invention relates to grinding machines, and more particularly to a machine for grinding a flat and frusto-conical surface on the end of a cylindrically shaped work piece.

One object of this invention is to provide a simple and thoroughly practical grinding machine for grinding the end face of a work piece. Another object of the invention is to provide a grinding machine which serves to produce a flat end face combined with a frusto-conical edge portion on a work piece. Another object of this invention is to provide a grindingmachine in which a flat face is produced on the end of a work piece when the work piece is traversed in 15 one direction past the grinding wheel and in which a frusto-conical edge portion is ground on the return stroke of the work piece across the wheel face. Another object of the invention is to provide a grinding machine for automatically grinding an end face on a work piece having a 20 flat portion together with a frusto-conical edge portion. Other objects will be in part obvious or in part pointed out hereinafter.

The invention accordingly consists in the features of construction, combinations of elements, and arrangements of parts, as will be exemplified in the structure to be hereinafter described, and the scope of the application of which will be indicated in the following claims.

In the accompanying drawings in which is shown one of various possible embodiments of the mechanical features of this invention,

Figure 1 is a front elevation of a grindingmachine embodying this invention;

Figure 2 is a fragmentary plan view of a grinding machine, showing the parts in a loading position;

Figure 3 is a fragmentary plan view of the grinding machine shown in Figure 2, having 4o parts broken away and shown in section to more 5 Figure 5 3 the control valve, showing the parts in a position for rapidly traversing the work table to and from an operating position;

Figure 8 is a cross sectional View, taken approXimately on the line 8-8 of Figure 7, showing the control valve in end elevation and a section through the table traverse cylinder;

Figure 9 is a cross sectional View, on an enlarged scale, taken approximately on the line 9-9 of Figure 1, showing the multi-speed table traverse mechanism;

Figure l is a fragmentary sectional View, vtaken approximately on the line lli-Ill of Fig- `urev 5, showing the work loading plunger and associated parts on an enlarged scale;

Figure 11 is a fragmentary cross sectionalA prising a base Il) which is arranged to support' a transversely movable wheel slide Il. The

wheel slide II rotatably supports a wheel spindle i2 in bearings i3 (only one of which has been illustrated) l2 supports a rotatable grinding wheel i4. The wheel spindle I2 may be rotated in the usual manner either by Vmeans of a belt drive or a motor drive from an electric motor mounted on the wheel slide. As illustrated in the drawings, however, a driving pulley l is mounted on the wheel spindle l2 and is connected by means of a driving belt' I6 with any suitable source of power.

The vbase I0 also supports a longitudinally movable work supporting table 23 which is arranged to slide longitudinally on the base I0 on a flat way 2| and a V-way 22 which mate with correspondingly shaped ways on the base l0 of ,the machine.

vThe table'2 may be traversed longitudinally either manually or by power. A manually operable feed mechanism has been illustrated cornprising a manually operable hand wheel 25 which Yis connected through a gear reduction unit to rotate the gear 26 which is rotatably carried on the shaft 21. The gear 26 is arrangedlto mesh with a gear 28.' The shaft 29 carries on its inner :end a rack gear 30 arranged to mesh with the The outer end of the wheel spindle' vco ` 38 to revolve.

Vtable 20.

able plunger 34' carried by the hand Wheel 25.

When the plunger 34 is moved outwardly, as shown in Figure 9, so that the clutch member 33 engages a xed clutch member 35. carried by the hand wheel 25, it serves to lockV a'gearl 36 in xed relation with the hand Wheel 25. When the hand wheel 25 is rotated, the gear 3S which isV xed thereto meshes with the'internal gear 32 and causes a rotation thereof which is transmitted through the gears 26, 28, 30, and rack 3| to traverse the table 20 longitudinally.

If a slow speed traversing movement of the table is required, such as for truing, the clutch member 33 is moved upwardly, as shown in Figure 9, so that it engages a clutch member 31 which is formed integral with a gear 38 rotatably mounted on a stud 3S which is formed integral with the gear 33. The gear 38 meshes with an internal gear il@ which is of slightlylarger diameter than the internal gear 32. In this position of the parts, with the clutch member 33 engaging the clutch 31, the hand wheel 25 is rotated, causing the gear The gear 38 is connected to the hand wheel 25 so that when the hand wheel 25 is rotated, the gear 38 rolls around the internal gear 49. The gear 38 is locked through the stud 39 with the gear 36 so that the gear 36 rotates and revolves with the gear 38 and due to the differential between the internal gears 4Q and 32, causes a slow rotation of the gear 32 which transmits a corresponding movement through the gear 26 to the rack 3l and the table 2S. For a more detailed disclosure of this multispeed manual traversing mechanism', reference may be had to the above-mentioned prior patent to Norton. Referring to Figure 9, the slidable clutch member 33 is in a central position, that is, disengaged from the clutch members 35 and 31. It is placed in this position during grinding so that the table 2G will be free to reciprocate without rotating the parts of the manually operable table traversing mechanism;

The grinding wheel slide Il may be `fed transversely either toward or from the work support by means of a manuallyV operable feed wheel 42 which is operatively connected to gears (not shown) to rotate a feed screw shaft 43 to cause a transverse movement of the slide. 'Ihis mechanism is not considered to be a part of the present invention and consequently has not been illustrated in detail. This mechanism is substantially the same as that shown in the expired U. S. Patent to Norton No. 762,838 dated June 14, 1904.

The table 20 is also arranged so that it may be traversed or reciprocated longitudinally by a power operated mechanismQnIn the preferred construction, a fluid pressure operated mechanism is utilized to reciprocate or traverse the As illustrated, this` mechanism comprises a iluid pressure cylinder 45 which is supported in a bracket 46 on the'table 20. The cylinder Vt5 contains a piston 41 which is` connected to one end of a piston rod 48.. The other end of the piston rod is connected to a bracket49 which is xed to the end of the base IU.

The piston rod 48 is preferably detachably connected to the bracket 49 so that the fluid pressure mechanism may be readily disconnected to facilitate manual traverse of the table for truing the wheel and setting up the machine. The piston rod 48 is provided with an annular groove 50 which is adapted to be engaged by a spring pressed plunger 5i carried by the bracket 49. When it is desired to detach the piston rod 48 from the bracket 49, the plunger 5I may be withdrawn, by means of the knob 52, from the groove 58 so thatV the table may be traversed without overcoming the fluid pressure within the cylinder 45.

This machine is particularly adapted for automatically grinding the end face of a work piece, and more particularly an end face requiring a flat end surface together with a beveled or chamfered edge portion. A rotatable work support is provided on the table 20 which is arranged with its axis of rotation at substantially right anglesto the axis of rotation of the grinding wheel. The work supporting member is preferably arranged so that when the table travels in one direction the axis of the Work is at right anglesV to the operative face of the grinding wheel and when the table is traveledA in the opposite direction the work axis is shifted so that its axis of rotation is at an angle to a plane perpendicular to the wheel axis so that a frusto-conical or chamfered edge portion is produced on the Vface of the work piece., v

A s illustrated in the drawingsa swivel base 68 is mounted on the upper surface of the table 28 and is pivotally connected by a stud Si to a subbase member 52 which is xedly mounted on the f table 2G. The stud 5l, which pivotally connects the work support 63 with the plate 62, is preferably arranged so that it may be adjusted longitudinally so vthat a line passing through the ,axis of the stud 6l is Vtangent to the line of intersection between the two surfaces to be ground, that is so that the work pivots about an axis in line' with the junction between the flat surface and the frusto-conical surface. By adjusting the position of the pivot, the diameter of the flat surface as well as the extent of the frusto-conical surface may be varied as desired. In the construc- 'tion illustrated, the stud is supported in a bracket 380 which is provided with a slideway Sill mating with a corresponding slideway on the plate 62. The bracket 385 is provided with a boss 352 which supports the lower end of the stud 6l. The bracket 305 is provided with Velongated slots 303 through which pass clamping. screws 334. The screws 384 are screw threadedinto the plate 62 and serve to clamp the bracket lili) in adjusted position. Similarly a bracket 335 is provided with a boss 306. The bracket 385 is provided with elongated slots 381 and clampingscrews 308 which serve to facilitate adjustment of the pivot relative to the work head 63. If desired, the upper surfaces of the bracket 3&5 may be provided with a graduated scale, and an index or ero point 309 may be provided on the head 63 to aid in adjusting the pivot to the desired ex- .Y tent.

'll whichv is slidably mounted within an aperture 12 within the spindle 64. The chuck closing member 'H is normally urged toward the left (Fig. 2) by means of a spring i3 which is interposed between a shoulder on the chuck closing member 'H and an internal shoulder within the spindle 64. A spring collet or chuck 15 is slidably mounted within the chuck closing member 'il and is held in place within the spindle by means-of a collar 76 which engages the front end face of the collet and is supported by a portion which is threaded into the end of the spindle 64. The collar 16 serves to locate the front end of the spring collet. A slidably mounted ejector rod 'l1 passes through the center aperture of the collet 15 and is held in a forward position by means of a spring 18. When a work piece is inserted within the spring collet i5, it is pushed in against the end of the ejector rod li and compresses the spring 78 as it is moved into an operating position within the collet.

In order to release the collet 'i5 when iiuid under pressure is admitted to cylinder chamber ti, a stop thrust collar Elia is supported adjacent to the outer end of the spindle it. When huid under pressure is admitted to chamber 88, it causes the chuck closing sleeve 'il together with the coilet 15 to move toward the right (Fig. 1i) until the hea-d of the work piece engages the front face of the stop collar 18a. Continued admission of fluid to the chamber 8S serves to move the sleeve Tl to a further extent toward the `right while holding the collet l5 against such movement, which serves to withdraw the sleeve 'l5 and thereby release the spring collet. The released tension of the spring 18 then moves the ejecting plunger 11 toward the left to eject the work piece into the discharge chute |45.

A suitable means is provided to withdraw the collet closing member "il to an inoperative position to permit ejection of the work and loading of a new piece of work into place within the collet. This mechanism preferably comprises. a cylinder containing a slidably mounted piston 86 which is connected to the inner reduced portion Si' of the collet closing member 'l l Fluid may be admitted through a pipe 88, into a cylinder chamber t8, to cause the spring closing member il to be withdrawn toward the right (Fig. 2) against the tension of the spring i3 to release the spring collet from its grip on the work piece. When a work piece has been inserted within the spring coilet 15, the work piece must be held in this position until the fluid pressure is cut off from the pipe 88, thereby releasing the tension of the 13 and causing the collet closing member it to slide toward the left, as viewed in Figure 2, to close the chuck or collet 'l5 and thereby lock the work piece in a grinding position. During the insertion of the work piece, the ejector plunger has been moved toward the right, as viewed in Figure 2, compressing the spring i8. After the work piece has been ground to a predetermined extent, and the work table has moved from a grinding position, fluid under pressure is admitted through the pipe 88, into cylinder chamber 8S, to withdraw the chuck or collet closing member 'il against the tension of the spring i3, thereby releasing the tension of the spring i8, which causes the ejector plunger to move toward the left, as viewed in Figure 2, into the position illustrated to eject a finished ground work piece therefrom.

In order to swivel the plate Sit so as to automatically change the relation of the work axis of rotation relative to the operative face ofthe grinding wheel, a suitable mechanism is provided to der 85 which is fixed to the table 28. The cylinder contains a slidably mounted piston which is connected by a piston rod tl to one end of a link 98. The link 98 is connected to the piston rod 8l by a stud 88. The other end of the link is connecte-d by a stud i853 with a projecting bracket itl mounted on the swivel plate 8d. IThe piston 8i; is provided with an enlarged portion lll? which serves to stop the movement of the piston to position the work at right angles to the operating face of the grinding wheel iii, as viewed in Figure Li. A pair of adjustable collars 83 adjustably carried on a threaded portion ltd of the piston rod @l serve to limit the swiveling movement of the piston 95. Fluid under pressure is admitted to a cylinder chamber 85 through a pipe it and to a cylinder chamber lili through a pipe w8 by means of a fluid pressure system to be hereinafter described.

The work to be ground is preferably automatically loaded into the machine and automatically ejected therefrom. A work receiving hopper or magazine i i@ is supported by a bracket i l i and a bracket H2 on the base lil. A plurality of work pieces H3 are loaded in position in the hopper itil and roll down into the position illustrated in the drawings. adjacent to the loading station is provided with an upper plate lid which holds the work pieces on a guiding track l l5 carried by the. hopper l it. After a work piece has been inserted in the machine and the loading plunger kwithdrawn yto an inoperative position, the work piece H3 rolls downwardly, due to gravity and the pressure of adjacent work pieces, into` position in alignment with a loading plunger and moves downwardly until supported on a il-shaped supporting member l i6 in alignment with a loading plunger ill. The loading plunger ii'l is normally held in a rearward position by means of a spring H8 and is arranged to operate in timed relation with the other parts of the machine so that the plunger 5:

cylinder 28 is provided. The loading plunger Eil' ispreferably formed as a piston rod which is connected to move with a piston i2l slidaoly mounted within the cylinder lZii. pressure is admitted from a pipe 1122 into a cylinder chamber V28 to cause the loading plungerV il? to move toward the right to push the work piece M3 into an operating position within vthe chuck or collet l5.

1t is desirable to locate the work piece i i3 within the collet 'l5 so that the surface of the wor piece to be ground is located in a definite position so that the same amount of stock is ground from the surface of each work piece. n A sleeve lZ-i which is threaded on its periphery and meshes with corresponding threads in the hea-d of cylinder 28 serves to limit the movement of the piston i2! toward the right, as viewed in Figure 2. When the piston 52| is moved to insert a work piece into the machine, the piston contacting with the end of the threaded sleeve @24 serves to locate the surface to be ground relative to the chuck l5.

The brackets il! and H2 which support the hopper or magazine l I0 are adjustably supported on the base lll to permit adjustment of the same The portion of the hopper lio e Fluid under relative to the base for setting up the machine to grind various types of work pieces. The loading plunger is provided with an integral supporting bracket |30 which is adjustable longitudinally on a bracket |3| which supports the saine on the base I0. -By providing suitable elongated slots and clamping bolts, the loading plunger may be adjusted longitudinally relative to the base so as to adjust the position of the axis of the plunger into alignment with the work supporting chuck. The bracket i3@ which supports the work loading plunger is provided with elongated slots |40 and |6| through which pass clamping bolts |42 and |43 respectively. These bolts are'threaded into the bracket |3i and are arranged to permit a longitudinal adjustment of the work loading plunger H1 and its associated parts. The bracket |3|, which supports the work loading plunger ||1, the hopper or magazine H6 and a discharge chute |535, is provided with elongated slots |96, |61, |63, i139 and |56 through which bolts pass to adjust-ably secure the bracket |3| to a iixed bracket 5| which is bolted to the base 0 of the machine. YThe elongated slots M6, |41, |8, M6 and |5i serve to permit a longitudinal adjustment or" the work loading mechanism, the magazine and associated parts, to facilitate setting up the machine.

'I'he work piece H3 sliding into the V-shaped supporting guide i i6, which aligns the work piece with the opening in the chuck or collet 15, is preferably supported on a pivotally mounted member i6 which is normally held in an upward position by means of a spring iti' supported by the bracket iti. The member |66' is pivotally supported in a frame M2 which is provided with a plurality of elongated slots |63 which surround guiding bolts i6@ and permit a vertical movement of the member |66. When the work piece is pushed toward the right by 'means VofV the plunger H1, the body portion of the work piece i3 is pushed into the chuck and the head of the work piece riding over the angular surface of the V-shaped member H6 depresses the member |60 pivoting on the top bolt i164 so that the head on the work piece may pass thereover in its movement into the chuck 15. The V-shaped member is adjustable longitudinally of the member |66 and may be clamped in adjusted position by means of a clamping screw |55.

In order that the various fluid pressure actuated mechanisms of the machine may be operated in the desired timed relationship with each other, it is desirable to provide a fluid pressure system in which a cycle control valve |16 is provided to control the admission and exhaust of iiuid from theV various cylinder and piston mechanisms above described. A iiuid reservoir iii is provided in the base of the machine and serves to convey uid through a pipe |12 to a fiuid pressure purnp |13. The pump |13 is connected by a pipe |14 with the control valve |16.

The main or cycle control valve is preferably a piston type valve comprising a valve stem having formed integrally thereon valve pistons |16, |11, |16, 519, |86 and |6i. Fluid under pressure from the pipe |163 passes through a pipe or passage |82, a pipe |83 and a pipe or passage |84 into the various valve chambers.

Fluid under pressure from the cycle controlV valve |10 passes at the predetermined time in the cycle through the pipe 68 to the chuck release cylinder 85, through the pipe |22, to the work loading plunger cylinder |20, through a pipe |06,

spectively, so that the fluid passing through these afg pipes may be regulated, as desired, to control the speed of movement of the cylinder 45.

It is desirable that the table move rapidly in bringing the work piece |3 up to an operative position where it is about to contact with the operative face of the grinding wheel lliY and to then slow down the movement of the table to a predetermined grinding speed, thereby reducingV the idle time by causing rapid positioning movements of the table. plished by providing a control valve |90 within the pipe line |06, which serves to control the admission of an exhaust of fluid through a pipe |9| into the cylinder chamber |35. The valve This is preferably accomf |90 is preferably a piston type valve comprising a valve stem |92 and a pair of spaced valve pistons |93 and |94 formed integrally thereon. A spring |95 serves to normally hold the valve stem |92 in a downward position (Figure 4), so that iluid exhausting through the pipe |9| enters through a V-port |96 which in the position of the parts is wide open, thereby allowing the full supply of fluid to pass into cylinder chamber |86, causing the work table to move rapidly towardthe right, as viewed in Figure l.

The rapid movement of the table continues until the adjustable screw |91 in the end of the valve stem |92 engages an adjustable dog |96 mountedv on the base l0 of the machine. As the end of the screw |91 rides up the inclined surface'of the dog 5 |98, the valve piston |93 is raised toV partially close the V-port |96, thereby restricting the ilow of fluid through pipe |9| from the cylinder chamber |85, thereby reducing the rapid idle movement of the table 20 to a slow grinding speed. By adjusting the position of the screw |91 and locking the screw in adjusted position by :means of a locking nut 200, the V-port |96 may be closed to a greater or lesser extent. Similarly, after the work piece passes across the face of the grindi" ing wheel in the movement of the table toward the right, the screw |91 rides down the incline at the other end of the dog |98 and thereby increases the speed of the table during the movement of the table toward the right and the shifting of the work holder in its angular relation with the wheel ready for its return stroke.

The cycle control valve |16 is normally urged toward the left, as viewed in Figure 4, by means of a spring 292 which is interposed between the end of the valve casing and a thrust washer 203 on the end of a valve stern |15. The valve stem |15 is arranged so that it may be moved in a direction toward the right (Figure 4) by two separately actuated means. A rock arm 206 pivotally mounted on a stud 201 is connected at one end by a pair of pins 208 with a spool shaped member 209 on the valve stem |15. The other end of the rock arm 206 is connected by a stud 2| to one end of a link 2| the other end of which is connected by a stud 2| 2 with an electric solenoid 2|3. The valve stem |15 may also be actuated by means of a cam bar 2|5 which is adjustably supported on the bracket |l mounted on the base I0 of the machine.` A bell crank lever 2 I 6 is pivotally mounted on a stud 211 and its upper end is connected by means of one of the pins 288 which I are mounted in the arm 286 engaging the spool shaped member 288. The other arm of the bell crank lever 2i8 is provided with a follower roller 2|8 which .is arranged to engage the various portions ci' the cam bar The cam bar 2|5 is provided with elongated slots 228 and 22| through which pass the clamping bolts or screws 222 and bar 2|5 is provided at its right-hand end (Figure ment of the table 223. These bolts are fastened to the supporting bracket which is in turn fastened to the base I8 of the machine and serves to permit a longitudinal adjustment of the cani bar 2 5. The cam 5). with a safety or stop member' 225 which serves to shift the cycle of control valve to stop the parts of the machine in case the table travels beyond a desired distance. The cam bar is provided with cam surfaces 228 and 221 as well as an adjustable cam surface 228 which is provided with elongated slots 22s and 238 and is clamped to the cam 'oar 215 by clamping screws 23| and 232. By means of the elongated slots 229 and 238 and the clamping screws 23! and 232, the cam' surface 228 may be adjusted relative to the portions 221 and 226 of the cam bar 2|5 to facilitate adjustment of the operation of the mechanism.

In order to energize the solenoid 2|3 invtimed relation with the movements ofthe parts of the machine, power is supplied, as indicated, by the power lines 283. A normally closed limit switch 234 is mounted on the front of the base of the machine and is arranged so that an adjustable dog engages a roller 235 to actuate the limit switch 235 as the table 28 is moved toward the right and is the end of the grinding stroke to deenergize solenoid 2i3 so as to reverse the move- 28. .A normally open limit switch 221 is supported on a bracket on the rear of the cylinder i2@ and is arranged so that an adjustable collar 238 carried by the movable work loading plunger H1 engages a roller 239 on the limit switch 251 when the plunger is moved to insert a work piece within the collet 15 and closes the circuit, thereby energizing the solenoid 2i3 (Figure 4).

After a work piece has been ground and the A table 28 moves toward the left so that when the work piece is clear of the grinding wheel and the roller 2|8 rides on the cam surface 226 and when roller 2|8 leaves surface 226 to engage cam surface 221, fluid under pressure is admitted. through the hose 88 into cylinder chamber 89 to move the valve piston 86 toward the right (Figures 2 and 4) to release the collet 15, the released tension of the spring 18 moves the ejector rod 11 toward the left to eject a work piece H3 from the collet 15 and allow it to drop into the discharge chute |45 which conveys the finish ground piece of work from the machine.

The operation of this machine is readily apparent from the foregoing disclosure. Assuming the parts to have been previously adjusted for the particular work piece H3 shown, and assuming the work table 2D to be at the eX- treme left-hand or in its loading position, the valves and fluid pressure parts are in the position illustrated in the diagrammatic view (Figure 4). Fluid under pressure from the pump |13 passes through pipe |14 and pipe or passage |83 into a valve chamber 248 and out through a pipe |22 into the cylinder chamber |23 to move the piston |2| toward the right until it contacts sleeve |24, as viewed in Figure 4. This movement serves to move the plunger ||1 to push a work piece H3 into the aperture in the collet 15. This movement serves to move the ejecting plunger 11 toward the right (Figure 2) to compress the spring 18. When the plunger H1 has moved the work piece so that the head of the work piece engages the locating collar 15 on the outer endof the spindle 84, the adjustable collar 238 engages the roller 286 of the limit switch 231 and closes the circuit, thereby energizing the solenoid2|3 and shifting the valve stem into the position as shown in Figure 5 so that fluid under pressure passing through theA pipe |14 and pipe |84 passes into a valve chamber 24| and out through a pipe. 88, into the cylinder chamber |81, to swivel the work support 68 to shift the work axis so that it lies at right angles to the axis of rotation of the grinding wheel and at the same time passes fluid into the cylinder chamber |86 to start the table 28 moving toward the right, as viewed in Figure 1. The table is moved first at a rap-id rate and as the head of the work piece approaches the operative face of the grinding wheel I4,- the screw |21 riding up on the dog |98 partially closes the v -port |86 to slow down the table movement to a grinding speed by throttling the exhaust of fluid from the cylinder chamber |85. motor (i1-and passes across the operative face of the grinding Wheel' to grind a flat end face on the surface of the work piece, as shown in Figure The movement ofthe table toward the right continues until the dog 235 engages the roller 238 of the limit switch 234, which serves to open the circuit, thereby deenergizing the solenoid 2|3,

A and the released compression of the spring 282 moves the valve stem |15 and its associated parts toward the left, as viewed in the various figures, until the follower roller 2|8 engages the surface 226 of the cam bar 2|5. This movement shifts the Valve pistons into the position illustrated in Figure 6. Moving the valve into this position passes fluid under pressure from-the pipe |14 through pipe |84, valve-chamber 24| and through pipe |06, into cylinder chamber |85, which serves to swivel the `support @8in a clockwise direction into the Vposition illustrated in Figure 4 so that the stop nuts |83 engage the fixed stop surfacek on the end of the cylinder and so that the axis of rotation of the work piece lies at an angle to a perpendicular plane passing through the wheel axis so that on the return stroke'of the table in its movement toward the left, a frusto-conical edge portion will be ground on the outer edge of the flat end face of the work piece, las shown in Figure 13. At the same time fluid under pressure is admitted through the pipe |9| into cylinder `chamber to start the table moving toward the left, first at a rapid rate until the screw |91 rides up on the dog |88to throttle the inflow of uid to the chamber |85 and thereby slow down the table to a predetermined grinding'speed. As viewed in Figure 6 also fluid exhausts from the cylinder |20 to withdraw the plunger H1 so that a .new work piece Will/roll into place.

The movement of the table continues toward the left until the roller 2 8 drops into contact with the surface 221 of the cam bar 2|5, as indicated in FigureS, which serves to allow a further released compression of the spring 282 to shift the valve stem |15 into the position of the parts'as illustrated in Figure 8. This movement serves to allow fluid under pressure passing through the pipe |14 to pass through pipe |82, into a valve chamber 245, and out through a pipe 88, into the cylinder chamber 89 to move the piston B6 toward the right, as viewed in Figures 2 and 4. This movement of the piston 86 toward the right serves to move the chuck releasing member 1| also toward the right to release the spring collet 75, and the released compression of the spring 78 moves the ejector rod toward the left to eject the Work piece I3 into the discharge chute It. The movement of the table 2|) continues toward the left until the roller 2 I 8 rides up on the cam surface 228, which serves to cut off fluid un-der pressure to the pipe |06 and to cut off exhaust from the pipe |08 and thereby stop the table movement. The table 20 and the work holding chuck 15 are then in position to start the next cycle of operation. The next Work piece having rolled into the position on the Work supporting member H6, the fluid under pressure is applied through pipe |22 to again admit uid under pressure to cylinder chamber |23 to start the Work loading plunger in its movement to- Ward the right (Figure 4) to move the next piece of Work I3 into operative relation with the work holding chuck or spring collet 15, whereupon the released tension of the spring 13 moves the chuck closing member 'll toward the left (Figure 2) to clamp the work piece in operative position in the chuck. The cycle of events is then completed and successive work pieces are ground first with their axis of rotation at right angles to the axis of rotation of the grinding Wheel to grind a flat end face thereon, after which the Work axis is shifted so that it lies atan angle to a perpendicular plane passing through the axis of the Work so that on the return stroke of the Work piece across the operative face of the grinding Wheel, a frusto-conical edge surface is ground adjacent to the periphery of the flat end surface. This cycle of events is then continued in grinding successive pieces of Work to the desired size and shape.

l achieved. As many possible embodiments 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 in the accompanying draw- Y ings is to be interpreted as illustrative and not in a limiting sense.

I claim:

1. In a grinding machine, a transversely movable rotatable grinding Wheel, a longitudinally movable table, means to move said Wheel transversely toward and from said table to grind a Work piece, means to traverse said table longitudinally in either direction relative to the grinding Wheel, a rotatable work support on said table arranged to grind one surface on the Work piece during a traversing movement of said table, and automatically operated mechanism actuated in timed relation with said table traversing movement at one end of its stroke to shift said Work support relative to said table Yso that the axis of rotation of the Vvvork is shifted relative to the axis of rotation of the grinding Wheel to grind a second surfacexon said Work piece'vvhen the table Yis traversed in the opposite direction. y

2. In a grinding machine, a transversely movable rotatable grinding Wheel, means to -move Said movement of said table in one direction, automatically operated mechanism actuated in timed relation with said traversing movement of the 0 table at one end of its stroke to shift said Work support about its pivot and relative to said table so that the axis of rotation of the Work is shifted relative to the axis of rotation of the grinding Wheel to grind a second surface on said Work piece when the table is traversed in the opposite direction, and means to adjust the position of said pivot so that the axis of the pivot is tangent to a line passing through said axis and the junction between said first and second surfaces on the Work piece.

3. In a grinding machine, a transversely movable rotatable grinding Wheel, a longitudinally movable table, means to move said Wheel transversely toward and from said table, means to traverse said table longitudinally in either direction relative to the grinding Wheel, a rotatable Work support on said table arranged to grind one surface on the work piece when the table is traversed in one direction, and automatically actuated means operated by said table at one end of its stroke to shift said Work support relative to said table so that the axis of rotation of the Work is shifted relative to the axis of rotation of the grinding Wheel to grind a second surface on said Work piece when the table is traversed in the opposite direction.

4. In a grinding machine, a transversely movable rotatable grinding Wheel, a. longitudinally movable table, means to move said Wheel transversely toward and from said table, means to traverse said table longitudinally in either direction relative to the grinding wheel, a rotatable Work support on said table arranged to grind one surface on the Work piece when the table is traversed in one direction, and automatically actuated means operated by and in timed relation with said table at one end of its stroke to shift said Work support relative to said table so that the axis of rotation of the Work is shifted relative to the axis of rotation of thev grinding wheel to grind a second surface adjacent to said rst surface when the table is traversed in the opposite direction.

5. In a grinding machine, a transversely movable rotatable grinding Wheel, means to move said grin-ding Wheel transversely, a longitudinally movable table, means to traverse said table in either direction, a rotatable Work support on said table which is arranged so as to grind one surface on a Work piece when the table is traversed in one direction, pivotal connections between said support and table, and means actuated by said table at one end of its stroke to shift said work support about its pivot and relative to said table so as to change the axis of rotation of the Work piece relative to the axis of rotation of the grinding Wheel so as tol grind aY second surface on said Work piece when the support is traversed in the opposite direction.

6. In a grinding machine, a transversely movable rotatable grinding Wheel, means to move said Wheel transversely, a Ylongitudinally movable table, means to traverse said table'in either direction, a rotatable Work support on said table,

pivotal connections between said support and table, said support being arranged to grind one surface on the work piece when the table traverses in one direction, means to shift the Work support about its pivot and relative to the table so as to shift the axis of rotation of the Work piece relative to the axis of the grinding Wheel to grind a second surface on said Work piece When the Work support is traversed in the other direction, and means toI adjust the position of said pivotal connection longitudinally relative to said rotatable Work support so that the axis of the pivot extended is tangent to the junction between said first and second surfaces on the Work piece.

7. In a grinding machine, a transversely movable rotatable grinding Wheel, a longitudinally movable table, means to move said grinding Wheel transversely toward and from said table to produce the desired grinding action, means to traverse said table longitudinally in either direction, a rotatable Work suppo-rt carried by said table and arranged to support the Work piece so that its axis of rotation bears a deiinite relation with the axis of rotation of the grinding Wheel to grind one surface on said Work piece when the table is traversed in one direction, and means including a fluid pressure piston and cylinder which is actuated by and in timed relation With the table reciprocation at one end of its stroke to automatically shift the position of said Work support to change the axis of rotation of the Work piece relative to the axis of rotation of the grinding Wheel so as to grind a second surface on said Work piece when the Work support is traversed in the opposite direction.

8. In a grinding machine, a transversely movable rotatable grinding Wheel, a longitudinally movable rotatable Work support having its axis of rotation arranged at right angles to the axis of rotation of the grinding Wheel to grind a flat end face on the Work piece when the Work support moves in one direction, and means actuated by said Work support at one end of its longitu- -dinal movement toy shift the axis of rotation of the Work piece relative to the axis of the grinding Wheel to grind a frusto-conical Surface adjacent to said flat surface When the Work support is moved in the other direction.

9. In a grinding machine, a transversely movable rotatable grinding Wheel, a longitudinally movable table, a rotatable Work support thereon having the axis of rotation arranged at sub'- stantially right angles to the axis of rotation of the grinding Wheel to grind a fiat end face on the Work piece when the Work support is moved in one direction, and automatically actuated means to shift the axis of rotation of the Work piece relative to the axis of rotation of the grinding Wheel so as to grind a rusto-conical surface adjacent to said flat surface when the Work support is moved in the opposite direction.

10. In a grinding machine, a transversely movable rotatable grinding vvheel, a longitudinally movable table, a rotatable Work support thereon having its axis of rotation arranged at substantially right angles to the axis of the grinding Wheel to grind a flat end face on the Work piece when the table is traversed in one direction, fluid pressure actuated means to reciprocate said Work support, and means actuated in timed relation with said reciprocation to automatically shift the axis of rotation of the Work piece relative to the axis of rotation of the grinding Wheel so as to grind a frusto-conical edge portion on the end of said Work piece when the work support is traversed in the opposite direction.

1l. In a grinding machine, a transversely movable rotatable grinding wheel, a longitudinally movable table, iiuid pressure operated means including a piston and cylinder to move said table in either direction, a rotatable Work support carried by said table, means including a fluid pressure cylinder to shift the position of said rotatable Work support and a control valve which is arranged in one position to move the Work table longitudinally While the axis of rotation of the Work piece is arranged at right angles to the axis of rotation of the grinding Wheel to grind a flat end surface o-n the Work piece, and means to shift said control valve at the end of said stroke to admit iluid under pressure so as to reverse the table movement and to' said second cylinder to shift the axis oi rotation of the Work support relative to the axis of rotation of the grinding Wheel so as to grind a frusto-conical surface adjacent the edge of said flat surface when the Work support moves in the opposite direction.

l2. A grinding machine comprising a base, a rotatable grinding wheel, a transversely movable Wheel slide to support said Wheel, a longitudinally movable work supporting table, a rotatable work supporting chuck on said table having its axis of rotation arranged at right angles to the axis of the grinding Wheel so as to present the end face of a work piece for grinding, means to rotate said chuck, means to traverse the table longitudinally in one direction While the axis of the Work is at right angles to the axis of the grinding Wheel so as to grind a flat face on the Work piece, and means to move the axis of the Work supporting chuck so that the Work axis makes an angle less vthan or greater than ninety degrees With the axis of the grinding Wheel before the table is traversed in the opposite direction to grind a charnfer or frusto-conical edge portion on the Work piece.

13. A grinding machine comprising a base,'a rotatable grinding Wheel, a transversely movable grinding wheel slide, a longitudinally movable table, a rotatable Work supporting chuck on said table having its axis of rotation at right angles to the axis of the grinding Wheel so as to present an end face of a Work piece for a grinding operation, means including an electric motor on said table to rotate said chuck and work piece, a Work loading device including a fluid pressure actuated plunger to successively load work pieces into said chuck, means including a fluid pressure piston and cylinder to clamp said Work piece in said chuck, means including a fluid pressure piston and cylinder to reciprocate the Work table and chuck longitudinally in one direction to grind a flat end face on the work piece, means including a fluid pressure piston and cylinder arranged to swing said chuck so that its axis of rotation is at an angle greater or less than ninety degrees relative to the axis of the grinding Wheel before the piston and cylinder start the table moving in the opposite direction so as to grind a chamfer or frusto-conical face on the edge portion of said Work piece.

14. A grinding machine comprising a base, a rotatable grinding Wheel, a transversely movable grinding Wheel slide, a longitudinally movable table, a rotatable ivo-rl; supporting chuck on said table having its axis or" rotation arranged at right angles to the axis oi rotation of the grinding Wheel so as to present an end face of a Work piece for a grinding operation, means including an electric motor on said table to rotate the chuck and Work piece, a Work loading device including'a iluid pressure actuated plunger to Vsuccessively load Work pieces into said chuck, means including a fluid pressure piston and cylinder to clamp said work piece in the chuck, means including a fluid pressure piston and cylinder to reciprocate the table and chuck longitu- 10 dinally in one direction to grind a fiat end face on the Work piece, means including a iiuid pressure piston and cylinder to swing said chuck so that its axis of rotation is at an angle greater or less than ninety degrees relative to the axis ci l5 the grinding wheel before the table starts moving in the opposite direction so as to grind a chainfer or frusto-conical face on the edge portion of said v Work piece, and means including a cycle control valve which serves to control the admission of 20 iluid to all of said cylinders.

15. In a grinding machine, a transversely movable rotatable grinding Wheel, a longitudinally movable table, means including a uid pressure piston and cylinder which are operatively con- 25 nected to traverse said table in either direction,

a rotatable work supporting chuck pivotally connected to said table and arranged With its axis of rotation at substantially right angles to the axis of rotation of the grinding wheel, means includ- 30 ing a fluid pressure piston and cylinder to control said chuck, means including a piston and cyiinder to shift the axis of rotation of said chuck so that When the table moves in one direction the axis of the chuck is at right angles to the axis 35 of the grinding Wheel and so that the axis of the chuck is at an angle other than ninety degrees relative to the axis of the grinding wheel when the table moves in the opposite direction, a Work loading plunger arranged to insert a Work piece into said chuck, means including a iiuid pressure piston and cylinder operatively connected to actuate said loading plunger, and a control valve in said system which is arranged to control the admission of uid to said plunger cylinder to insert a Work piece in said chuck, to release fluid under pressure in said chuck cylinder so as to clamp the Work piece Within said cylinder, to admit fluid to said table traverse cylinder, to traverse the work piece with its axis at right angles to the axis of the grinding Wheel across the face of the wheel to grind a iiat face thereon, to admit fluid to said third cylinder, and to swivel said Work chuck so that its axis of rotation is at an angle to a plane normal to said Wheel when the table moves in the opposite direction to grind a frusto-conical edge portion on said Work piece.

16. In a grinding machine, a transversely movable rotatable grinding Wheel, a longitudinally movable table, means including a fluid pressure piston and cylinder which are operatively connected to traverse said table in either direction, a rotatable Work supporting chuck pivotally Yconnected to said table and arranged with its axis of rotation at substantially right angles to the axis of rotation of the grinding wheel, means including a iuid pressure piston and cylinder to control said chuck, means including a piston and cylinder to shift the axis of rotation of said chuck so that when the table moves in one direction the axis of the chuck is at right angles to the axis of the grinding Wheel and so that the axis of the chuck is at an angle other than ninety degrees relative to the axis of the grinding Wheel when the table moves in the opposite-direction, a Work loading plunger arranged to insert a work piece into said chuck, means including a iiuid pressure piston and cylinder operatively connected to actuate said loading plunger, and a control valve in said system which is arranged to control the admission of iiuid to said plunger cylinder to insert a work piece in said chuck, to release uid under pressure in said chuck cylinder so as to clamp the Work piece Within said cylinder, to admit iiuid to said table traverse cylinder to traverse the Work piece With its axis at right angles to the axis of the grinding Wheel across the face of the Wheel to grind a fiat face thereon, to admit uid to said third cylinder, and to swivel said work chuck so that its axis of rotation is at an angle to a plane normal to said wheel when the table moves in the opposite direction to grind a frusto-conical edge portion on said work piece, and to admit iiuid to said chuck cylinder after one complete reciprocation of the Work table to release said chuck and eject a Work piece thereupon.

HERBERT A. SILVEN.

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