US2003713A - Grinding machine - Google Patents

Description

J 1935- V c. J. HIGHBERG 2,003,713

GRINDING MACHINE Fiiled March 31, 1928 s Sheets-Sheet 1 h ZEI I I {Ill n I P In I June 1935- c. J. HIGHBERG 2,003,713

GRINDING MACHINE Filed March 31; 1928 3 Sheets-Sheet 2 Cdrle High berg June 1935- c. J. HIGHBERG 2,003,713

' GRINDING \MAGHINE Filed March 31, 1928 3 Sheets-Sheet 3 Curls J: H'Lc hben Patented June 4, 1935 PATENT OFFICE GRINDING MACHINE Carle J. Highberg, Worcester, Mass., assignor to The Heald Machine Company,

Worcester,

Mass, a corporation of Massachusetts Application March 31, 1928, Serial No. 266,287

26 Claims.

The invention relates to internal grinding machines, and particularly to the workholding and work rotating mechanism thereof. The invention is shown applied to an automatic internal grinding machine in which the grinding operation is automatically terminated when each workpiece has been ground to the desired internal diameter. Since the invention of such automatic internal grinders, the production rate of small internally ground articles has been greatly increased, by the elimination of the previously necessary hand gauging. On such machines, however, manual chucking and unchucking of the workpieces between successive grinding operations is still the rule, and it is these time-consuming operations that have limited further increase in the rate of production.

More specifically the present invention provides so-called centerless workholding means, the workpiece being supported and held in position during the grinding operation by tangential rolls. The provision of such is therefore, one object of the invention. A further object of the invention is to render it unnecessary for the operator of the machine to position the workpieces in the workholding means and remove them therefrom and to this end the machine of the invention .provides automatically operated mechanism which performs these functions.

Further objects and advantages of the invention will more fully appear from the following detailed description which, taken together with the accompanying drawings, illustrates some embodiments of said invention. In said drawings:

Fig. 1 is a front elevation of an internal grinding machine showing the invention applied thereto. 7

Fig. 2 is a fragmentary view partly in plan and partly in section, illustrating the workholding and 40 work rotating means and the magazine.

Fig. 3 is a sectional view on the line 3-3 of Fig. 1, showing the workholding and work rotating mechanism in elevation.

Fig. 4 is an elevation of the left hand side of the machine.

Figs. 5 and 6 are fragmentary views of the magazine together with the escapement mechanism shown in two positions.

Fig. '7 is a schematic view illustrating the automatic means for causing the carriage to travel to the idle position, fragments of the cross feed mechanism and the carriage controlling parts being shown in conjunction with a wiring diagram.

Like reference characters refer to like parts throughout the drawings.

Referring first to Fig. 1 an internal grinding machine is shown having a reciprocatory table or carriage l by the reciprocation of which the 5 grinding traverse is produced, the said table in this instance supporting a wheel head 2 in which is journalle'd the usual spindle 3 carrying the grinding wheel 4. The spindle driving means which causes the rapid rotation of the grinding 10 wheel 4 is not herein disclosed, as such is well known in this art and any suitable form thereof may be provided. Similarly, the aforesaid reciprocating motion of the table I, to cause the rotating wheel 4 to make the required interior trav- 15 erse of a workpiece, may be imparted in any well known manner, but, as illustrative .of a specific embodiment of such, reference should be had to United States Letters Patent No. 1,582,468, granted April 27, 1926 to Heald and Guild, which 20 shows fluid pressure actuating and reversing mechanism to produce the aforesaid traverse, and automatic means to stop the grinding table or carriage when the grinding wheel is fully separated from the work, the table I of the present 25 invention being shown in this position in Fig. 1. Said table I provides a pair of spaced adjustable dogs 5 and 6 which are adapted to alternately engage and move a reversing member 1, these parts constituting the controlling means of the 30 aforesaid actuating and reversing mechanism.

In this embodiment of the invention the wheel head 2 is carried by a cross slide, not shown, which is mounted on ways for movement transverse to the line of reciprocation of the table I, as is the 5 ordinary practice in internal grinding machines. A cross feed screw to move the aforesaid cross slide is indicated by'the numeral 8 and, referring to Figs. 1 and '7 said cross feed screw is intermittently actuated in the following manner:--a 40 ratchet wheel 9 is either directly or through the medium of reduction gearing connected to the screw shaft 8, and an actuating pawl I0 is normally out of engagement with said ratchet wheel, but when moved upwardly will engage and move it. The pawl I0 is carried on the end of a pivoted member H, which also provides a roller l2 that rides on and is raised by an adjustable cam member l3 at the end of each working stroke of the table I that carries the grinding wheel inposition. The cross feed screw 8 can also be actuated from a hand wheel I 5 since, as aforesaid, the pawl I0 is normally out of engagement with the ratchet 5, being held thus by a spring, not

shown, there being a. cam member I! which forces it toward the ratchet wheel only when the said pawl is raised.

Referring to Figs. 1, 2, 3 and 4, a bridge I8 is attached to the machine frameand spans the ways I9, I9 which support the table I thus allowing said table to move thereunder. This bridge I8 provides an upwardly extending frame portion 20 which supports the work holding and work rotating meansand the work magazine. Extending horizontally from the right hand face of the frame portion 20 are a pair of studs 2I and 22 upon which are mounted for rotation a pair of flanged rollers 23 and 24 respectively, these rollers constituting tangential supports for the workpieces to be ground. As shown in Fig. 3, the axis of rotation of the roller 24 is in the same vertical plane as the axis of a'workpiece a when in a grinding position, so that the point or points of tangency will lie directly beneath the center of the workpiece.

The third tangential support for the workpieces comprises a large flanged roller 25, to

which rotation is imparted and which therefore rotates the workpieces a, said roller being moved into and out of work-holding position to allow each ground workpiece to be discharged from the machine and an unground workpiece to be placed in grindin position. roller"25 is suitably journalled on a shaft 26 and suitable means such as a pulley 21 formed integrally therewith is provided to rotate said roller,

., there beinga belt, not shown, running to the pulley 21 from any suitable source of power. The shaft 26 is held by an arm 28 which is pivotally mounted on a bolt'or stud 29 of an oscillatory member 30, said member. 30 being mounted'for oscillation on the frame portion 20 by means of a projecting cylindrical portion 3I provided by the latter and an internal cylindrical bearing surface 32 provided by the former. The axis of oscillation of the member 30 coincides with the axis of rotation of the workpieces a. I

Referring now to all the figures, annular workpieces a to be ground may be stacked one behind the other in a trough shaped magazine 33, the trough of the magazine being inclined as shown, and the workpieces being stacked therein so that they will roll toward the work-holding means as best shown in Fig. 4. An escapement device 34 is provided so that the workpieces will be released one at a time and only when desired, the

, construction and actuation of this device being after said roller 25 moves back to its original and' normal position and in so doing guides a'fresh workpiece a, which has been released by the escapement device 34, into grinding position tangent to the rolls 23 and 24 and the roller 25.

This movement of the roller 25 is accomplished.

through oscillation of the member 30, and the upward movement of the roller 25 occurs coincidentally with and is brought about by movement To that end the.

of the table I to the position of Fig. 1 in which the'grinding wheel is withdrawn from the grindworking traverse in relation to a workpiece a,'it.

being understood that the fresh workpiece has reached the grinding position by the time the wheel 4 starts to enter it.

The mechanism for imparting oscillations to the oscillatory member 30 in response to movement of the table I to remove and replace workpieces in grinding position will now be described. Referring to Figs. 1 and 2 the table I has fastened to the rear thereof a short bracket 35 which provides a hub portion 35a with a longitudinal hole. Through said hole extendslongitudinally a long rod 36 which is supported at the left hand end by a bell crank lever 31 and is otherwise unsupported except by the hub portion 35a. The bell crank lever 31 is pivoted at 38 to the bridge I8 and besides being connected to the rod 36 is connected by a link 39 to one end of a lever 40 which is pivoted at H to the bridge I8. The other end of the lever 40 has a connection to a depending arm 42 provided by the oscillatory member 30, and as the lever 40 swings in one plane and the oscillatory member 30 swings in a plane at right angles thereto, this connection is made by means of a link bar 43 connected by pivot pins in different planes to short links 44 and 45; the link 44 being'piv'otally connected at 4-6 to the lever 40 and the link 45 being pivotally connected at 41 to the arm 42.

During the greater part of the travel of the table I to carry the grinding wheel 4 away from a ground workpiece, the hub portion 350, simply slides over the rod 36 without effect thereon;

I member 30 to move the roller 25 up to the-magazine 33, where. it remains till the operator of the grinding machine starts it in operation again as by the manual moving or" a control lever 49 which causes the table I to move to the left, Fig. 1. On such return movement of the table I, the hub portion 350. again passes over the rod 36 without. effect thereon until it comes in contact with a loose collar 50 mounted on said rod, which collar 50 is spaced by a stiff coil spring 53, from a collar 5|, the latter being fastened to said rod as by a pin 52. The spring 53 is strong enough to resist compression until the linkage mechanism has caused the oscillatory member 30 to lower the roller 25 to work-holding position;- a new workpiece a has arrived at such position just prior to the entrance of the grinding wheel 4 into it, and the additional movement of the table I to cause such entrance merely causes compression of the spring 53, the member 30 being prevented from moving beyond the position shown. in Fig. 4 by a stop pin 54 which is engaged by the depending arm 42.

'I'he'machine of the present invention provides automatic means to cause the table of carriage I to move to the inoperative position shownin Fig. 1; such may be set in operation by any kind of gage or caliper mechanism, or it may be con-' trolled from the cross feed actuating mechanism as shown, for example, in U. S. Letters Patent to Taylor, No. 1,682,673, granted August 28, 1928. The present drawings disclose a control of the latter sort, and the essential elements thereof, so far as they relate to the present invention, will now be pointed out. Referring to Figs. 1 and '7, the left hand table dog 5, unlike the right hand table dog 6, is a pivotally mounted dog, being supportedby a pin, provided by a carrying block 56 adjustably positioned, as is the block 51 of the dog 6, tothe table or carriage I. Below the dog 5 and in the path thereof is a lever arm 58, which is pivotally mounted on a stud 59; one end of the lever arm is adapted, when raised, to cause the dog 5 to lift up and be carried clear of the reversing member 1, while the other end of said lever arm incorporatesan armature 160. Said armature 60 lies just above an electromagnet 6| which, when energized, draws the armature downwardly and consequently raises the right hand portion of the arm 58.

The hand wheel I5, or some part connected thereto or to the ratchet wheel 9 carries acam member 62. In the path of this cam member is an adjustable screw 63 carried by a contact making lever 64. This lever, when moved by the cam, closes anelectric circuit at 65 and causes an electric current to flow through the magnet 6| from a generator 66 or any other suitable source, the current passing by way of a conductor 61 from the generator to the magnet, by way of a conductor 68 from the magnet to the contact points at 65, the other lead of the generator and the lever 64 being both grounded.

In the grinding of any given workpiece, the grinding wheel is caused to cut deeper and deeper by the intermittently actuated cross feed mechanism described hereinbefore; at any desired position of such mechanism the cam 62 can be caused to engage and move the lever 64 thus closing the circuit described and raising the lever arm 58. Raising of this arm causes the dog 5 to be lifted clear of the reversing member I on the next subsequent travel of, the carriage I to the right, and said carriage therefore continues its movement uninterrupted until it is stopped by the means shown in the aforesaid patent to Heald and Guild, or by any other means. In the patent to Taylor referred to, there is shown a compensating mechanism which, in conjunction with a dressing mechanism such as shown at 69 controls the cross feed mechanism inerelation to the size of the grinding wheel, so that workpieces uniform in size are produced; such com- Cal pensating and dressing mechanism is desirably incorporated into the present machine, but having nothing to do with the present invention will not be described herein.

Referring now to Figs. 4, 5 and 6, upward movement of the roller 25, occasioned by outward travel of the carriage I as described, releases a workpiece a in the magazine 33 by operation of the escapement 34. The latter comprises a pin I0 projecting through a slot II in the side of the magazine and normally engaging one of the workpieces a by contact with its inner periphery. The pin I0 is mounted on the front face of a block I2, said block being pivotally mounted on a pin I3 extending between the ears I4, I4 provided on the side of a magazine 33. A spring device I5 holds the block 12 normally in the position shown in Fig. 5; movement of the oscillatory member 30 to the position shown in Fig. 4 causes an arm 15 formed integrally with said member 30 to engage and depress a horizontally projecting portion 11 of the block I2, thus withdrawing the pin III from engagement with a particular workpiece a I and allowing, therefore, all of the workpieces a to move downwardly in the trough magazine 33.

The parts are shown in this position in Fig. 4, the bottom workpiece being prevented from falling out of the magazine by the roller 25. When, as the table I moves to carry the grinding wheel 4 back into grinding position, the oscillatory member 30 swings clockwise, Fig. 4, the arm 16 releases the block I2 and the pin 10 engages the inside of the next succeeding workpiece a. The workpiece that has been released follows the roller 25 downwardly, resting partly on the roller .23 and revolving by reason of the revolution of the roller 25. From the view of Fig. 3, it will be seen that the angular location of the rollers 25 and 23' during the grinding operation is such that the workpieces could not enter between these rollers if the roller 25 moved only in a path concentric with the axis of ultimate rotation of the work. Therefore, means is provided to move the roller in a radial direction to allow the workpiece to enter into grinding position. To that'end there is formed integrally with the frame portion 20 a cam I8, which acts against a roller I9 which is mounted on a ball bearing, not shown, carried by the shaft 26. A spring 80, connected to pins 8| and 82 provided by the oscillatory member 30 and the arm 28 respectively, tends to hold the roller 25 close to the axis of the workpiece rotation, with .the roller I9 in engagement with the cam I8. The parts are substantially in this position when a workpiece a is released; as the oscillatory member 30 swings downwardly, the roller 19 rides on the cam I8 and the driving roll 25 is swung outwardly. Just. before the parts have come to the position shown in Fig. 3, the rollers 23 and 25 have separated enough to allow the workpiece a to drop through onto the roller 24; the gap between the rollers 24 and 25 at this time is not large enough to allow the workpiece a to drop out of the machine, and by reason of a sharp inclination in the cam I8, the roller 25 moves rapidly and practically vertically downward, following the workpiece a into grinding position and holding it there by the pressure of a spring 80.

, In the operation of the machine, the operator Q has only to load the trough magazine 33 with a plurality of workpieces, depressing the projecting portions" of the block I2 and allowing the pin III to enter the inside of a given workpiece to hold all of them in position in the magazine. The table I being then in the position of Fig. l and the driving roller 25 being raised as shown, the machine is started by shifting the main control lever 49.. This causes a single workpiece a to be released and to be guided down into grinding position as already described. It should be noted that the rotation of the pulley 25 helps to force the workpiece down and the cam I8 need only open up the roller 25 enough to allow the workpiece a. just room to squeeze through. The cam 18 should be shaped so that the roller .25 will drop into position rapidly and hold the workpiece a without excessive rebound as it strikes the roller 24; the flanges on all three rollers 23, 24 and 25 hold the workpiece longitudinally of the axis thereof, and it should be noted in this connection that these flanges are slightly wedge shaped in order to grip the workpiece firmly.

The workpiece is now automatically ground to the required internal diameter, and when such diameter is attained, the table I runs outwardlyin response to lifting of the pivotallymounted dog 5', as described. The roller 25 then moves upwardly, releasing the ground workpiece afrom grinding position, and releasing another workpiece a in the magazine 33. The ground workpiece will drop out of the machine, because it is still rotating, and the friction on the roller 24 tends to cause it to move to the left, Fig. 3, and as it is directly over the axis of said roller 24, a slight amount of" movement suffices to cause it to drop out.

It should be observed that instead of providing the means set forth in the aforesaid patent to Heald and Guild to stop the table I in its outward position when a particular workpiece is finished, an additional table dog could be provided which would swing over the reversing member I and start thetable inwardly again.

Such simple addition to the machine here shown would make the machine completely automatic, so. that the operator would not have to-start the machine again after each grinding operation, except for the fact that the cross slide mechanism would need retraction to allow the wheel 4 to enter a new workpiece. But the latter may also be provided and an exemplary embodiment thereof is shown in my prior application Serial No. 99,287, filed April 2, 1926, and it should be understood that the present machine can be made completely automatic by the incorporation of this table reversing dog and automatic wheel retraction mechanism, both of which are shown in said application. 7

Instead of rotating the workpiece a by means of rotation imparted to the roll 25, it might be rotated by rotation imparted to either of the rolls 23 or 24, particularly as these are mounted on a stationary axis, and indeed both of these rolls could be positively driven to rotate the workpiece within the scope of my invention. Similarly, instead of causing only the roll 25 to move to allow workpieces to be received in workholding position and discharged therefrom, either or both of the rolls 23 and 24 could be moved to permit the introduction or discharge .of a workpiece either with or without the movement of the roll 25. The above and many other changes in the actual embodiment of the invention fall within the scope of the appended claims.

I claim:

1. In a machine of the class described, the combination with a plurality of tangential rolls to hold a workpiece in position to be operated upon, certain of said rolls being resiliently urged against said workpiece to hold it in position and certain of said rolls being rotated to rotate said workpiece, means for moving one of said rolls into and out of workholding position to allow finished workpieces to be removed and unfinished workpieces to be placed in workholding position, of a magazine adapted to hold a plurality of workpieces and escapement means to release said.

workpieces one by one from said magazine to allow them to be received between said rolls.

2. In a machine of the class described, the combintion with a plurality of rolls for holding workpieces in positionv to be operated upon by tangential engagement with them, and means. for moving one of said rolls into workholding position where it presses resiliently against a workpiece and for moving said roll away from the other rolls to allow a finished workpiece to be removed from operating position and a fresh workpiece to be introduced into operating position, of means for introducing the fresh workpieces into operating position against the resilient pressure of said movable roll, said means consisting partly in the rotation imparted to one of said rolls whereby the workpiece is rotated.

3. ma machine of the class described, the combination with workholding means comprising a plurality of rolls to hold a workplace in operating position, and means for moving one of said rolls in relation to the other rolls to open a gap therebetween to permit a finished workpiece to be removed from the machine and a fresh workpiece to be introduced into operating position, of a magazine located above said rolls, and escapement means to allow workpieces to descend by gravity one by 'one into operating position.

'4. Ina machine of the class described, the combination with workholding means comprising a plurality of rolls to hold a workpiece in operating position, and means for moving one of said rolls in relation to the other rolls to open a gap therebetween to permit a finished workpiece to be removed from the machine and a fresh workpieceto be introduced into operating position, of a trough-shaped magazine adapted to hold round workpieces in a position where they will roll downwardly if released, said magazine being located above said workholding means, and escapement means to release said workpieces one by one to allow them to move downwardly by gravity into workholding position.

5. In a machine of the class described, the combination with workholding means comprising a plurality of rollsto hold a workpiece in operating position, and means for moving one of said rolls in relation to the other rolls to open a gap therebetween to permit a finished workpiece to be removed from the machine and a fresh workpiece to be introduced into operating position, of a trough-shaped magazine adapted to hold round workpieces in a position where they will roll downwardly'if released, said magazine being located above said workholding means, and escape ment means to release said workpieces one by one to allow them to move downwardly by gravity into workholding position, said escapement means be ing operated by the movement of the movable roll away from the other rolls.

6. In a machine of the class described, workholding and loading mechanism comprising a pair of rotatable rolls mounted 'on stationary axes, a third rotatable roll, a magazine adapted to hold a plurality of workpieces, and means for moving said third roll to and from said magazine to guide 'a workpiece'into operating position.

7. In a machine of the class described, workholding and loading mechanism comprising a plurality of rotatable rolls certain of which are movable with respect to the others to" open up the workholding means to allow workpieces to be inserted and ejected therefrom, a magazine for holding a plurality of workpieces, and escapement means for releasing said workpieces from said magazine one by one, said escapement means comprising in part the movable roll and in part a separate escapement member.

8. In a machine of the class described, workholding and loading mechanism comprising a plurality of rotatable rolls one of which is movable with respect to the others to open up the workholding means to allow workpieces to be inserted and ejected therefrom, a magazine for holding a plurality of workpieces, and escapement means for releasing said workpieces from said magazine one by one, said escapement means comprising in'part the movable roll and in part 75 a separate escapement member, the latter being operated by the means that move said roll.

9. A grinding machine having, in combination, a carriage having an idle position and a position in which it reciprocates, workholding means comprising a plurality of rotatable rolls one of which is movable with respect to the others to introduce and discharge workpieces, and connections between said movable roll and said carriage to cause the former to be moved by the latter when it nears the idle position, and to. be moved in the reverse direction when the carriage nears the position in'which it reciprocates, and means to allow the carriage to reciprocate without effect upon the said movable roll.

10. In a machine of the class described, a pair of rolls mounted on fixed axes, a third roll which in combination with the first two constitutes workholding means, oscillating means for moving the third roll, a mounting for said roll on said oscillating means whereby it may move towards or away from the axis of the workpiece, and can means to guide said movable roll upon movement thereof, whereby to facilitate the introduction of a workpiece into operating position.

11. In a machine of the class described, the combination with means for peripherally supporting and frictionally rotating a workpiece for operation on an internal surface thereof, said means comprising a roll mounted upon a fixed axis and engaging the periphery of the workpiece, and an opposed roll resiliently urged against the workpiece and engaging the periphery thereof on the opposite side, 'and'a supporting member beneath said rolls and engaging the periphery of said workpiece, one of said rolls being rotated to procure rotation of the workpiece, and means for moving said second roll into and out of workholding position to allow finished workpieces to be removed from, and unfinished workpieces to be placed in workholding position, of a magazine adapted to hold a plurality of workpieces and escapement means to release said workpieces one by one from said magazine to allow them to be received between said rolls.

12. In a machine of the class described, the combination with means for peripherally supporting and frictionally rotating a workpiece, said means comprising a roll mounted on a fixed axis and engageable with the periphery of the workpiece, an opposed roll on a movable axis engaging the periphery of said workpiece on the opposite side thereof, and-a supporting member beneath said rolls and engaging the periphery of the workpiece, one of said rolls being rotated to procure rotation of the workpiece, and means for moving said second roll away from said other roll to open a gap therebetween to permit removal of a finished workpiece and insertion of an unfinished workpiece between said rolls, of a magazine located above said rolls, and escapement means to allow workpieces to descend by gravity one by one into operating position.

13. In a machine of the class described, workholding and loading mechanism comprising opposed rolls, one of which is mounted on a stationary axis, said rolls being engageable with the periphery of a workpiece, one of .said rolls'being rotated to procure rotation of the workpiece, a supporting member beneath said rolls andrengageable with the periphery of the workpiece, the other of said rolls being movable with respect to the roll on the fixed axis to open up the workholding means to allow workpieces to be inserted and ejected therefrom, a magazine for holding a plurality of workpieces and escapement means one by one, said escapement means comprising in part the movable roll and in part a separate escapement member.

14. In a grinding machine, the combination with a grinding member and a work-supporting member, the lattercomprising spaced rolls for engagement with the periphery of a workpiece on opposite sides thereof, and a support beneath said rolls for engagement with the periphery of 'said workpiece, one of said rolls being rotated to procure rotation of the workpiece, and a table or carriage carrying one of said members adapted when reciprocated to produce a relative working traverse between said wheel and workpiece, of means responsive to the table movement to procure discharge of a'finished workpiece from said worksupporting member.

15. In a grinding machine, the combination with a grinding member and a work-supporting member, the latter comprising spaced rolls for engagement with the periphery of a workpiece on opposite sides thereof, and a support beneath said rolls for engagement with the periphery of said workpiece, one of said rolls being rotated to procure rotation of the workpiece, and a table or carriage carrying one of said members adapted when reciprocated to produce a relative working traverse between said wheel and workpiece, of means responsive to the table movement to procure discharge of a finished workpiece from said work-supporting member and to position an unfinished workpiece in said member.

16. A grinding machine having in combination, a carriage having an idle position-and a position in which it reciprocates, workholding means comprising a pair of rolls in opposed relation for engagement with the periphery of a workpiece on opposite sides thereof, and a work-support beneath said rolls and engaging the periphery of said workpiece, one of said rolls being movable with respect to the other for removal and insertion of workpieces therebetween, and connections between said movable roll and said carriage to cause the former to be moved by the latter when it approaches the idle position and to be moved in the reverse direction when the carriage approaches the position in which it reciprocates.

17. In a machine of the class described, a pair of rolls mounted in opposed relation for engagement'with the periphery of a workpiece on opposite sides'thereof, a support beneath said rolls and also engaging the periphery of said workpiece, oscillating means for moving one of said rolls, a mounting for said roll on said oscillating means, whereby it may move toward or away from the axis of the workpiece, and cam means to guide said movable roll upon movement thereof to facilitate the introduction of a workpiece into operating position.

18. In a grinding machine, 'an internal grinding wheel, means for peripherally supporting and frictionally rotating a workpiece for a grinding operation on an internal surface thereof, a table, reciprocation of which procures a traverse of the grinding wheel over the surface of the workpiece, and means responsive to movement of said table to procure discharge of a finished workpiece from the supporting means.

19. In a grinding machine, an internal grinding wheel, means for peripherally supporting and frictionally rotating a workpiece for a grinding operation on an internal surface thereof, a table, reciprocation of which procures a traverse of the rinding -wheel over the surface of the workpiece, andmeans responsive to movement ofsaid table to procure discharge of a finished work- ;piece from the supporting means, and to position ,operation on an internal surface thereof, a table,

reciprocation of which procures a traverse of the grinding wheel over the surface of the workpiece, means under the control of the grinding operation for procuring an extended movement of the table for an axial separation of the grinding wheel and the workpiece, and means responsive to said extended ,movement of the table to procure .discharge of, a finished workpiece from the supporting means. i l

21. In a grinding machine, an internal grinding member and a work-supporting member, the latter including a regulating wheel, a support spaced therefrom and a pressure roll for holding a workpiece against the support and regulating wheel, a table on which one of said members is mounted, means for procuring a crossfeed movement between the grinding member and a workpiece in the work-supporting member, and means responsive to the crossfeed movement and operative when the cutting surface of the grinding wheel reaches a predetermined position relative to the surface of the regulating wheel for procuring a rnnout of the tablefor separating the grinding member from the workpiece in the work-supporting member..

. 22. In a grinding machine, an internal grinding member and a work-supporting member, the latter including a regulating wheel, a support spaced therefrom and a pressure roll for holding a workpiece against the support and regulating wheel, a table on which one of said members is mounted, means for procuring a crossfeed movement between. the grinding member and a workpiece in the work-supporting member, and means operative when the cutting surface of the grinding member reaches a predetermined position relative to the work-supporting member for procuring an extended movement of the table for an axial separation between thegrinding member and the workpiece in the work-supporting member.

-23. In a grinding machine, an internal grinding member and a work-supporting member, the latter including a regulating wheel, a support spaced therefrom and a pressure roll for holding tion.

aoosms aworkpiece against the support and regulating wheel, a table on which one of said members is' her and the workpiece in the" work-supporting member when the workpiece reaches a terminedsize.

24. In a grinding m'achine, an internal grinding member and a work-supporting member, the latter including a regulating wheel, a support spaced therefrom and a pressure roll for holding a workpiece againstthe support and regulating wheel, a table on which one of said members is mounted, size controllingmeans for procuring an extended. movement of thetable -for an axial separation between. the grinding member-and a workpiece in the workesupportingmember when said workpiece reaches apredetermined size, and means. responsive to said extended movement of the table for procuring aradial discharge of the workpiece from the supporting member.

25. In a grinding machine, the combination with a grinding member and a work-supporting member, the latter comprising spaced rolls for engagement with the periphery of-.- a workpiece on opposite sides thereof, and a support beneath said rollsfor engagement with theperiphery of saidworkpiece, one of said rolls being rotated to procurerotation of the workpiece, and a table or carriage carrying one of said members adapted, when reciprocated, to' produce a relative working traverse between said wheel and workpiece, of means responsiveto the table movement to procure a radial discharge ofa finished. workpiece from said work-supporting membenand to position an unfinished workpiece in said member. a

26. In amachine of the class described,- a pair of rolls mounted in opposed relation for engagement with the periphery of a workpiece .on opposite sides thereof, a supp rt beneathsaid rolls and also engaging the periphery of. said workpiece, oscillating means for moving one -of said rolls about an axis coinciding substantially with the axis of said workpiece, a mounting for said roll on said oscillating means whereby itmay be moved toward or away from the axis of the workpiece, and cam means for guiding saidmovable roll upon, movement thereof to facilitate. the introduction of a workpiece into operative posi- 01mm: J. um.

prede-

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