US1847588A - Grinding machine - Google Patents

Description

March 1, 1932,

Filed Aug. 6. 1930 C. BOOTH GRINDING MACHINE 4 Sheets-Sheet l made: my

March l, 1932. c. BOOTH 1,847,588

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GRINDING MACHINE Filed Aug. 6, 1950 4 Sheets-Sheet 4 Qnvnnfoi CLEMENT ooTH l animan,

Patented Mar. l 1, 1932 UNITED STATES PATENT oFFlcE CLMENT BOOTH, OF CINCINNATI, OHIO, ASSIGNOB TO CINCINNATI GRINDRS INCOR- PORATED, OF CINCINNATI, OHIO,A A CORPORATION OF OHIO GRINDING MACHINE Application' led August 6, 1930. Serial No. 473,371.

This invention relates to improvements in machine tools and especially to improvements in centerless grinders. y

In the ordinary standard centerless grinder as heretofore known and used, workl pieces were introduced into the grinding `throat to action of a centerless grinder. To finish or` grind work pieces about a definite predetermined axis or to finish the exterior surface of a hollow article concentric with a finished interior bore thereof itl is necessary thatthe work pieces be rotated about this axis and restrained from iioating or shifting while in the grindng throat.

It is, therefore, one of the rincipal objects of this invention to provi e an improved mechanism for use with the standard centerless grinder whereby the work pieces may be concentrically inished or ground about a predetermined axis.

Another object of the invention is the provision of improved' automatic means so synchronized as to substantially, continuously produce work pieces each an exact duplicate of the other and all within close limits, such as several ten thousandths of aninch.

Another object of the invention is to provide a mechanism for accomplishing the above noted objects in which the work pieces are 4placed in a suitable ho per or'the like from which they are automatically discharged intothe grinding throat and subsequently .withdrawn therefrom preparatory to a repetition of the automatic cycle. y

Other objectsand advantages of the present invention should be readilyapparent by .reference to the following specification considered in conjunction with the' accompanydrawings forming a part thereof and it is to be understood that any modifications may be made in the exact structural details withoutk departing from or exceeding the spirit of the invention as definedv in the appended claims.

In the drawings: Figure 1 is an elevational view of a grinding machine embodying the improvements of this invention.

Figure 2 is a plan view of the device shown in Figure 1.

Figure 3 is a sectional view as seen online 3-3 of Figure 1.

Figure 3A is a continuation of the view shown in Figure 3.

Figure 4 is a sectional View taken on line 4 4 of Figure 2.

Figure 5 is a sectional view taken on line 5 5 of Figure 4.

Figure 6 is a sectional view taken on line 6-6 of Figure 4.

Figure 7 is a fragmentary elevational view of a locking mechanism utilized toprevent inadvertent discharge of work pieces from the magazine as seen from line 7-7 of Figure 5.

Figure 8 is a sectional view taken on line 8-8 of Figure 2.

v Figure 9 is a sectional view taken on line 9-9 of Figure 8.

Figure 10 isa sectional view taken 10-10 of Figure 9.

Figure 11 is a diagrammatic view illustrating the hydraulic circuit involved in this invention.

Throughout the several views of the drawings similar reference characters are utilized to indicate the same or similar parts.

The machine or device here chosen for illustrating the invention was designed primarily to finish or grind the exterior sur ace of a work pliece concentric with an interior bore. As was noted above, the attachment for performing such grinding operation, is utilizedwith a standard centerless grinder. This grinder comprises a bed 15 havino mounted thereon at one end thereofa grinding wheel 16 for rotation at a high grlnding rate of speed in the direction of thel arrow thereon. The grinding wheel 16 is enclosed within a housinovr 17 integral with the bed 15 and supports or transverse movement across the face of the said grinding wheel 16 a trueing tool 18. In opposition to the grinding wheel 16 is a regulating wheel 19 rotatable in the key and key-way connection between the cyl-- 20 to the slide 22 and slide 22 to the bed 15 so that the said slides 20 and 22 may be actuated relative to the bed as a unit through the y\en gagement of clamp 24 and whereby slide 2O may be shifted independently of and relatively tothe slide 22 when the clamp 24 isv released and clamp 25 engaged.

The slides 20 and 22 are adjusted relative to one another when setting up the machine while the said slides are moved as a unit and independently of one another to feed' work controlled by the regulating wheel 19 in to the grinding wheel 16 to effect a stock removal therefrom. This movement of the slides is obtained through an adjusting screw 26 having secured to its outer end a pilot or hand wheel 27 whereby the said screw is actuated. The outer end of the screw is rotatably and translatably mounted in a housing 28 from which a bracket 29 extends. The bracket 29 is secured to a ledge or lug 30 extending from the base 15. The threaded portion of the adjusting screw 26 is threadedly received in a sleeve nut 31 secured in the housing or slide 2O by collars 32 and 33.

The grinding and regulating wheels form a grinding throat between their active faces in which the work piece 34 to be operated upon is mounted. As shown in Figure 4, the work pieces are hollow and into the opposite ends of the bore centers 35 and 36 are adapted to be received so that the rotation of the work takes place about alpredetermined axis or the axis of the bore. The center 35 is mounted for rotation with the work and the said center is carried by a spindle 37 supported by anti-friction bearings 38 and 39 mounted within housing 40. The housing 40 has depending from it a support 41 through the flange 42 of which clamp vbolts 43 extend for securing the said housing 40 to a block 44 carried by the inner end 45 of lower slide 22, as seen in Figure 4.

The other work supporting center 36 is likewise adapted to be rotated with the work and is similarly mounted ina" spindle 36 supported by anti-friction bearings 47 and 48 mounted on opposite ends of a cylinder 49. The cylinder 49 is adapted'to be slidably actuated through a tapered sleeve 50 from which a key 51 extends being received in a spline or key-way 52 formed in the cylinder 49. This inder 49 and sleeve 50 permits the said cylinder to be slidably actuated through-the sleeve but positively prevents any rotative movement thereof. The tapered sleeve 50 is received in a complementarytapered bore formed in housing 53 which has depending therefrom bracket 54 having flange 55 through which clamp bolts 56 extend for securing the said housing 53 to the block 44. Lock nuts 57 are threadedly mounted on the smaller end of the tapered sleeve 50 for securely locking the` sleeve in the said housing 53.

The cylinder 49 is provided on its end opposite the center 36 with a cap 58 from which a lug 59 extends. The lug 59 is provided with a threaded perforation receiving the threaded reduced end 60 of piston rod 61 on whose opposite end a piston 62 is .securely fastened. The piston 62 is received in and adapted to be reciprocated through a cylinder 64 integral with bracket 65 secured in any suitable or desirable manner to the housing 53. The piston 62 is reciprocated by an hydraulic medium under pressure which is controlled to operate in a predetermined synchronized relation as will later appear.

So that the work may be aligned with the centers 35 and 36 for engagement therewith there has been provided an automatic work loading and ejecting mechanism. This mech- Y a housing 72, one side 73 of which is provid-y ed with a longitudinal slot or opening 74. Secured to the slide 66 as by cap screws or the like 75 is a bracket 76 which extends through and moves relative' to the slot 74. The outer end of the bracket 76 is provided with a bore through which the reduced end 77 of piston rod 78 extends. Lock nuts 79 are received on the end 77 for securing bracket 76 and piston rod 78 to one another. The piston rod y7 8 has fast on its opposite end a piston 8O adapted to be actuated through a cylinder 81 carried by the bracket 82 secured to the slidable center housing 53. The cylinder 81 is secured to the bracket 82 at its upper end by a lock nut 83 and at its lower end by a simllar lock nut 84. The downward travel of the slide 66 is limited by engagement of an adjustable stop screw 85 extending through the bracket 76 and engaging the upper edge of bracket 82. The upward movement of the slide 66 is controlled by a yieldable bumper comprising bolts 86 slidably mounted in a blocky 87 secured by cap screws or the like 88 in the upper end of guide housing 72. Springs 89 surround the body of the bolts 86 interiorly of guide housing 72 having one end in abutment with the block 87 and the opposite ends abutting heads 90 formed on the lower end of the bolts 86. The actuation of the piston through the cylinder 81 is accomplished by an hydraulic mediumy and its movement is synf chronizled with the movement of slidable work plece 34, shown in Figure 4, is complete and the'piston 84 actuated upwardlyto carry said work It` will be noted that the arms 67 and 68 have a pin 91 extending between them just above the lower edge .of slide 66. As seen in Figure 4, the guide housing 72 is provided with an enlarged portion 92 forming a recess or pocket 93 in which an ejector member 94 is pivotally mounted as at 95. The lower end of arm 96 of ejector member 94 is provided with a facing 97 of some relatively soft material, such as leather, so as not to damage the surface of the lwork piece when it engages same. A second arm 98 extends from the ejector member 94 and lies in the path of movement of the pin 91. `The proportion of the parts just described is such that the upward movement of slide 66 will place the finished work piece opposite the opening 99 formed in an enlarged portion 100 of housing 72 opposite to the enlargedportion 92 thereof. /At this time pin 91 engages arm 98 of ejector member 94 causing Said ejector to be actuated in a clockwise direction about the pivot 95 and lcausing facing 97 of arm96 to strike an upward blow on the Work piece 34 and discharge said work piece from the work receiving notches 69 through the opening 99 into the discharge chute 101 fromwhich the work is guided to a suitable receptacle,- not shown, exterior of the machine.-

Assoon as pin 91 engages the arm 98 the piston 80 is actuated downwardly through the cylinder 81 carrying with it slide 66. At this time the Work carrying notches 69 are empty. It will be noted that a second pin 102 extends between the side lates67 and 68 near their lowermost edge. ivoted about a pin 103 above pin 102 is a bell crank 104 having arms 105 and 106. The enlarged portion 100 of the housing 72 is formed, just beneath the discharge chute 101, with an angular opening 107 in which loading chute 108 is mounted for holding and placing in the notches 69 unfinished Work pieces 34. The

work receiving and holding chute 108 is provided with a plate member 170 extending' longitudinally thereof on the supporting base.4 Near one end of the base a strap 171 is likewise secured. The plate 170 and strap 171 are spaced from one another to permit an enlarged portion 172 :to enter the chute. By this'construction the work pieces 34 may be placed Within the chute in one position only piece out of the grinding throat.A

thereby eliminating the possibility of feeding the work pieces to the grinding throat in a position to cause' a jam therein. Rotatably mounted in opening 109 at the inner end of the chute 108 is a work control member 110 having arms 110erl extending at right angles to one another to engage and prevent inadvertent dischargeof the work. It will be noted that one arm 110a extends Within the housing 72 while arm 106 of bell crank 104 extends beyond the housing and that the said arm 106 is adapted to en age the arm 11011` of control member 110. uring the upward movement of the slide 66 the bell crank 104 is actuated in a counter clockwise direction being free to somove while during the downward movement of said slide the engagement of arm 106 with control member 110 will attempt to rotate the bell crank 104 in a clockwise direction but this movement being restrained by the pin 102 the control member 110 will be actuated in a clockwise direction thereby releasing'the lowermost work piece to be caught or positioned within the work notches 69. To prevent inadvertent rotation of the work control member 110 it is provided exterior-ly of the housing 72 with a spring or yieldable detent. This detent comprises a star wheel or the like 173 secured to the end of work control shaft 174 having the arms 175 of the star wheel cooperating with afiiat spring or the like 176. The spring is secured by any suitable orv desirable means to a lug 177 integral with the housing 72.

After the work piece has been positioned on the centers 35 and v36 the slides 20 and 22 are actuated as a unit toward the grinding wheel to feed the said work piece into the grinding wheel. This is accomplished by an automatic mechanism enclosed within the housing 28. Said mechanism comprises a The worm 113 in turn being driven through l change gears 114 by a motor `115 suitably mounted in the lower end of the housing 28. The shaft 111 is journaled in the walls of the housing 28 and has fast onopposite ends thereof a cam 116 and 117, the former effecting the shifting of the slides While the latter controlling the movement of the work carrier and slidable center. As seen in Figure 8, cam 116 is provided with a groove 118 in which a roller 119 is mounted being adjustably carried by one end 120 of an arm 121 pivotally carried by the walls of the housing at 122. Pivotally carried by the arm 121 are links 123 having their opposite ends pivotally secured to a sleeve 124'mounted on the adjusting screw 26 and' held against movement relative to the screw by collars 125 and 126. The sleeve 124 is guided for limited movement through a guide sleeve 127 extending from the Wall of housing 28. By this construction the adjusting screw 26 is axially actuated for feeding the work piece into the grinding wheel to effect a stock removal therefrom but the screw may be further adjusted through the pilot or hand wheel 27.

In order to maintain engagement between the regulating Wheel 19 and the work 34 so as to control the rotation of said work during grinding the said wheel 19 is yieldably mounted on its spindle, as shown clearly in Figure 4. 'This yielding mounting comprises a collet 128 keyed to the regulating wheel spindle 129 and havinga plurality of radiallyextending pockets130. Each pocket is counter cored to form a. seat 131 near its lower end for forming an abutment for a spring 132. The springs 132 abut on their opposite ends with driving pins 133 limited in their outward movement by a segmental ring 134. Alternate pins extend through openings in the ring while the remaining pins extend between the space intermediate adjacent ends of the segments. The said adjacent ends of the segments of the ring and the portion of the ring surrounding the opening therein en gage a-circular vflange 135 formed on the pins 133 and limit the outward movement of said pins under the influence of the springs 132. The outer end of the driving pins 133 are received in slots 136 milled interiorly of a ring 137 integral with the regulating wheel 19. 0n initial engagement of the regulating wheel 19 with the work 34 the springs adjacent the point of contact between the Wheel and work are compressed and as the work is reduced in diameter the springs will expand thereby at all times maintaining a frictional Contact between the face of said wheel and the work to insure perfect control of the work by the said wheel.

In order to insure the disengagement of the regulating wheel 19 from the work 34 the upper slide .24 is retracted beyond the retraction ofthe lower slide`22. This additional movement is secured through a yieldable connection comprising a pin 178 carried by the slide 22 and receivingonc end ofy a spring 179. The other end of the spring is secured to an adjusti screw 180` threaded through a nut or the li ie 181 carried by the slide 20. A lug 182 may be secured to the bed 15 through which an adjustable abutment 1.83 extends for engagement With the lower s'lide 22 when the said slide 22 and slide 20 are retracted as a unit. When actuating the said slides toward the grinding wheel the spring 179 will first actuate slide 20 relative to the slide 22 whereupon ythe slides will move as a unit. The movement of the lower slide 22 and work is limited by an adjustable .abutment 200 carried by the bed.

- Referring now to the shifting of the live .center 36 toward and from the work and the verticall movement vof the carrier slide 66 resort is had to the cam 117, above no ted. This cam 117 is shown in Figure 10 and since it is fast on shaft 111 moves in unison with said shaft and cam 116. The cam 117' is provided with a groove 138 in which is received a roller carried by oscillatable arm 139. This arm is pivoted at 140 to a block 141 carried by housing 28. The upper end of the arm 139 has a pin and slot connection 142 with valve rod 143. The valve rod 143 carries spool valve 144 axially shiftable through valve sleeve 145 carried by valve casing 146 secured to the housing 28. The valve 144 controls the direction of flow of the hydraulic medium to the loading and ejecting cylinder 81 and shiftable center cylinder 64. Said medium is normally contained in a sump or tank 147 from which it is drawn through a conduit 148 by a pump 149 being discharged from the pump under pressure through conduit 150. The medium enters the sleeve 145 at one end thereof from which it is directed through ports 151 and 152 into conduits 153 and 154 which extend respectively to the upper end of cylinder 81 and the rear end of cylinder 64 for respectively lowering the piston 8() and bringing the work into position and for actuating the slidable center 36 into engagement with the work so positioned. The medium is directed first through the conduit 153 for lowering the work to position and then through the conduit 154. This is accomplished through the cam groove 138 which is so arranged as to synchronize the movements of the pistons 80 and 62. At the completion of the grinding operation, cam 117 actuates oscillatable arm 139 in. theopposite direction first directing the medium through conduit 155 for retracting the center 36 and releasing the work therefrom and then directing the uuid through conduit 156 for raising the work carrier and replacing the finished work with an unfinished one. The hydraulic medium within the cylinders 81 and 64 upon actuation in either direction is discharged through opposite conduits to the valve for connection with discharge conduit 157 for return to the sump or tank 147.

Since the cams 116 and 117 are actuated inA unison the shifting of pistons 80 and 62 will not take place until the regulating wheel has been withdrawn and is free of the said work and likewise the work piece will be loweredto grinding position and engaged by the centers before the regulating wheel is actuated toward the grinding wheel.

To insure the work being free of the 'centers 35 and 36 before attempting to raise same out of the grinding throat there has been provided an ejecting mechanism comprising a pivotally mounted lever 158 pivoted at 159 to a block 160 secured ,to block 44 and having its upper end 161 kforked or bifurcated, the arms of which are received in a groove formed in the work piece. A rod 162 extends from the arm 158 through an opening formed in the bracket 54 and has secured thereto intermediate its ends collars 164. The said spring 165 is compressed or 2c, work from c loaded during the upward shifting of center 36 through an arm 166 carried by the reduced portion of piston rod 61 and movable with said ,piston rod. An adjustable abutment screw 167 is carried by the arm 166 and abuts the outer end of rod 162. From this it will be seen that when thevcenter 36 is actuated toward the work the spring 165 is compressed and when the work has been completed and the center 36 retracted the spring 165 will expand carrying with it arm 158 which through the forked end 16,1.disconnects the 'enter 35 so that it can be raised by the work carrier slide 66.

Thevoperation of the device is as follows: A supply of work pieces is mounted in the magazine 108 and .the motor 115 actuated.

of the rod 162 under the The rotation of shaft 111 will through the cam 116 first retract the regulating wheel slide from the grinding wheel whereupon the cam 117 will shift valve 144 for retracting center 36 and raising the work carrier slide 66. The said cam 117 will immediately reverse the valve 144 and effect a downward movement of the carrier slide 66 causing bell crank lever 104 to engage and actuate work control member 110 to insert an unfinished work piece in the Work receiving notches 69. Continuous movement of the slide will bring the work in alignment with the centers 35 and 36 whereupon the center 36 will be actuated outwardly to engage thegend ofthe work. Cam 116 will then actuate the regulatingv wheel slides toward the grinding wheel t0 feed the work into the said grinding wheel. This movement of the regulating wheel slides continues until the work has been reduced to the desired size whereupon a rapid retraction of the regulating wheel takes place followed by an outward shifting of the center 36 and a disengagement of the work from the center 35 through the arm 158 whereupon the work carrier slide is raisedvto discharge the finished work therefrom' and pick up anuninished one for a repetition of the cycle.

What is claimed is: l

1. In a grinding machine of the class described the combination of a bed, a pair of opposed grinding and regulating wheels carriedthereby and forming a-grinding throat therebetween, means ,terminally engaging and supporting a work piece within the grinding throat in engagement with the said wheels,

means actuating one of said wheels toward I and from theother wheel, means operable in timed relation with the movement of the wheel for releasing thework, and means for 'removing the work from the grinding throat and positionin unfinished work therein.

2. In a grin ing machine of the class described -the combination of a bed, a grinding wheel carried thereby and operable at afhig grinding rate of speed, a regulating wheel in opposition to the grinding wheel operable at a slow Work controlling rate of speed, the proximate surfaces of the wheelsbeing spaced from one another to provide a grinding throat, means for translating one of said Wheels longitudinally of the bed toward and. from the other Wheel, means vertically shiftable relative to the grinding throat for placing in and removing work from the said grinding throat operable in synchronized yrelation .with the movement of one* of the wheels and a retractable work supporting member adapted to terminally engage the work.

3. In a grinding machine of the class described the combination of a bed, a grinding Wheel carried thereby and operable at a high grinding rate of speed, a regulating wheel in opposition to the grinding wheel operable at a slow work controlling rate of speed, .the proximate surfaces of the wheels being spaced from one another to provide a grindin throat, means for translating one of sai wheels longitudinall of the b ed toward and from the other Whee means vertically shiftable relative to the grinding throat for placinv in and removing work from the said grinding throat operable in synchronized relation with the movement of one of the wheels, a retractable work supporting member adaptedto terminally engage the work, ond work supporting member adapted to terminally engage the work in opposition to the retractable terminal engaging member.

4. In a grinding machine of the class described the combination of a bed, a grinding wheel carried thereby and operable at a hig grinding rate of speed, a regulating wheel in opposition to the grinding wheel operable at a slow work controlling rate' of speed,the proximate surfaces of the wheels being spaced from one another to provide a grindin throat, means for translating 'one of sai 1 wheels longitudinally of the bed toward and and a sec.- f

from'the other wheel, means vertically shift@ H15 'terminal work engaging members.

5. In a device of the class described the combination of a bed, a pair of opposed grinding and regulating wheels carried thereby, the proximate vportions of the wheels iao being spaced from one another to provide a worli receiving throat, a slide supporting one of the Wheels for movement relative to the bed toward and from the other wheel, a block on the slide beneath the Work receiving throat, a pair of housings carried thereby, a work 'supporting member rotatably carried by one of the housings for terminal engagement with the work, a Work supporting member rotatably and slidably supported by the other housing for terminal engagement with the work, a piston associated with the slidable member, a source of fluid pressure for actuating the piston, means for actuating th-e slide, and means operable in synchronized relation with the sli-de actuating means for reciprocating the piston and work terminal engaging means.

6. In a device ofthe class described the combination'of a bed or support, a grinding Wheel carried thereby, means terminally engaging a work piece for operation thereon by the grinding wheel, and means for positioning a Work piece relative to the work supporting centers and discharging it therefrom including a shiftable slide, a housing for the slide, a hopper in the housing, carrier means on the slide adapted to register with the hop- -per to receive work therefrom, and means for subsequently discharging the work from the carrier means.

7. In a device of the class Sdescribed the combination of a bed or support, a grinding wheel carried thereby, means terminally engaging a Work piece for operation thereon by the grinding Wheel, means for positioning a work piece relative to the work terminal engaging means and discharging it therefrom including a shiftable slide, a housing for the slide, a hopper in the housing, carrier means on the slide adapted to register with the hopper to receive work therefrom, means for subsequently discharging the work from the carrier means, and a work discharging chute adapted to receive the work discharged from the carrier member.

8. -In a device of the class described the combination of a bed or support, a grinding Wheel carried thereby, means terminally engaging a Work piece for operation thereon by the grinding wheel, means for positioning a work piece relative to the work supporting centers and discharging it therefrom including a shiftable slide, a housing for the slide, a hopper in the housing, carrier means on the slid-e adapted to register with the hopper to receive work therefrom, means for subsequently discharging the work from the carrier means, a Work discharging'chute adapted to receive the work discharged from the carrier member, and means for controlling the rotation of the work through frictional engagement therewith.

9. In a device of the class described the combination of abed, a pair of opposed grinding and regulating Wheels carried thereby and forming a work receiving throat therebetween, means for positioning work within the throat anddischarging same therefrom comprising a carrier, a housing for the carrier, means shifting the carrier through the housing, and means discharging the Work from the carrier comprising an ejector pivotally supported by the housing, a trip arm extending from the ejector in the line of movement of the carrier, and means on the ccarrier engaging the trip arm for actuating rier, a housing for the carrier, work supporting members on the carrier, means supported 'by the carrier inoperative during the movement thereof in one direction but operative on reverse movement to discharge a Work piece onto the Work supporting members.

11. In a device of the class described the combination of a bed, a pair of opposed grinding and regulating wheels forming a grinding throatl therebetween, means supporting a Work piece adjacent the grinding wheel for effecting a stock removal therefrom, and means forsuccessively placing a work piece on thesupporting means comprising a vertically shiftable carrier, Work carrying members on the carrier, a work supporting chute in the housing, a rotatable member at the end of the chute to control the discharge of work pieces therefrom, means normally locking the control member against movement, and means on the work carrier for actuating the Work control means.

12. In a device of the class described the combination of a bed, a pair of opposed grinding and regulating wheels carried thereby and forming a work receiving throat therebetween, means for supporting a Work piece Within the throat comprising a retractable center, means for placingin and removing work from the throat comprising a vertically `shiftable work carrier, means for actuating one of the wheels toward the other to feed the work into the grinding throat, and means for operating the several 'parts in synchronized relation whereby the work is positioned within the grinding throat, engaged by the retractable center for rotation thereabout and the wheels fed toward one another to effect ay stock removal from the supported workpiece. Y

13. In a grinding machine the combination of a pair of opposed grinding and regulatwork is first positioned/.relative to the 'terminal engaging means and then engaged there- In a grinding machine the combination of a pair of opposed grinding and regu- Ase lating -wheels forming a grinding throat therebetween, a magazine `for holding work pieces, means for transferring the work pieces individually from the magazine to thegrinding throat, and means for terminally engaging the workin the grinding throat in simultaneous engagement with -the grinding and regulating wheels.

15. In a grinding machine the combination of a bed, a grinding wheel carried thereby, a friction drive wheel carried by the bed and opposed to the grinding wheel, the said wheels being spaced'from one another a distance to form a grinding throat therebetweenJ means for supporting one of the wheels for movement toward and from the other wheel, means for eecting the movement ofv said wheels, means within the grinding throat terminally engaging the work for simultaneous engagement with the wheels, one of said terminal means being retractable, and means operated Vin timed sequence with the movement of the wheels for retracting said terminal engaging means.

16. In a grinding machine the combination of a bed; a grinding wheel carried thereby, a friction drive wheel carried by the bed and opposed to the grinding wheel, the said wheels being spaced from one another a distance to form a grinding throat therebetween, means for supporting`one o f the wheels for movement toward and from theother wheel, means for effecting the movement of said wheels, means within the grinding throat terminally engaging the work for simultaneous engagement with lthe wheels, one of said terminal means being retractable, means operated in timed sequence with the movement of the wheel for retracting said terminal engaging means, a. vertically shiftable carrier for conveying a work piece to a position in alignment with the terminal engaging means and for removing said work piece from the aligned position, and means for automatically replacingthe work piece on the carrier.

17; In a. grinding machine the combination of a bed, a grinding wheel carried thereby, a friction drive wheel carried by the bed and opposed to the grinding wheel, the saidl wheels being spaced from one another a distance to form a grinding throat therebetween, means for supporting one of the wheels for movement toward and from the other wheel, means for efecting the movement of said wheels, means within the grinding throat terminally engaging the work for simultaneous engagement with the wheels, one of said terminal means being retractable, means operated in timed sequence'with the movement of the wheel for retracting said terminal engaging means, a vertically shiftable carrier for conveying a work piece to a position in alignment with the terminal engaging means and for removing said workpiece from the aligned position, means for automatically replacing the work piece on the carrier, and a hydraulic pressure source for actuating the retractable terminal supporting means and carrier. j

18. A work loading and ej ecting mechanism for placing in and removing work pieces relative to the throat of a. grinding machine comprising a housing, a carrier carried by the housing and movable relative thereto, carrying fingers on the carrierforming a cradle for the work, a magazine associated with the carrier, means normally preventing discharge of the work from the magazine, and means on to carrier for rendering the last named means inoperative.

19. A work loading and ejecting mechanism for placing in and removing work pieces relative to the throat of a grinding machine comprising a housing, a carrier carried by the housing and movable relative thereto, carrying lingers on the carrier forming a cradle for the work, a magazine associated with the carrier, means normally preventing discharge of the work from the magazine, means on the carrier for rendering the last named means inoperative, a discharge chute associated with the housing, a trigger for ejecting. the work v piece from the cradle, and means on the carrier for operating the trigger and ejecting the work piece from the carrier to the discharge chute.

20. A work` loading and ejecting mechanism for placing in and removing work pieces relative to the throat of a grinding machine comprising a housing, a carrier carried by the housing and movable relative thereto, carrying fingers on the carrier forming a cradle. for the work, a magazine associated with the carrier, means normally preventing a discharge of the work from the magazine, means on to carrier for rendering the last/named means inoperative, a discharge chute associated with the housing, a trigger for ejecting the work piece from the cradle, means on the `carrier for operating the trigger and ej ecting terminally engaging the work, means for retracting the terminally engaging means prior to the withdrawal of the cradle and work, and means 'for stripping the work from the retractable terminal engaging means.

21. In a grinding machine of the class de' scribed the combination of a bed, a rotatable grinding wheel carried thereby, a rotatable friction drive wheel, a slide for the wheel supported by the bed `for movement toward and from the grinding wheel, the grinding wheel and friction drivewheel being spaced from one another to form a grinding throat therebetween, means within the grinding throat for terminally engaging the work piece there? in, one of said terminal engaging means being retractable, a vertically shiftable work carrier for aligning the work with the terminal engaging means and for withdrawing said work from said means, a rotatable cam shaft, a pair of cams on said shaft, connections between one of said cams and the slide for effecting the actuation thereof, and additional connections between the second cam and the movable terminal engaging means and carrier for eecting'their actuation. i

In testimony whereof I aix my signature.

CLEMENT BOOTH.

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