US1840231A

US1840231A - Grinding machine

Info

Publication number: US1840231A
Application number: US202108A
Authority: US
Inventors: Robert E W Harrison; Fred S Haas
Original assignee: Cincinnati Grinders Inc
Current assignee: Cincinnati Grinders Inc
Priority date: 1927-06-28
Filing date: 1927-06-28
Publication date: 1932-01-05
Anticipated expiration: 1949-01-05

Description

Jan. 5, 1932. R. E. w. HARRISON ET Al. 1,840,231

GRINDING MACHINE Filed June 28, 1927 2 Sheets-Sheet l Jan. 5, 1932. R. E. w. HARRISON ET AL 1,840,231

GRINDING MACHINE Filed June 28, 1927 2 Sheets-Sheet 2 f/'/ Gwenn Patented Jan. 5, 1932 I PATENT OFFICE ROBERT E W. HARRISON AND FRED S. HAAS, OF CINCINNATI, OHIO, ASSIGNORS TO CINCINNATI GRIN DERS INCORPORATED, OF

OHIO

CINCINNATI, OHIO, A CORPORATION Ol' GRINDING MACHINE Application led J'une 28,

This invention relates to improvements in grinding machines and has particular reference to a machine for the grinding of cam shafts or like bodies, having eccentric portions or portions of different shapes or diameters.

One of the objects of the present invention is the provision of a machine for the production of a cam shaft or like article which shall be entirely automatic in operation from inception to completion of the grinding of the several portions thereof.

A further object of the invention is the provision of a machine for the production of cam shafts or the like, capable of cyclic operation to insure a rapid approach of the grinding Wheel and Work, coupled with a proper relative feeding action of the parts during grinding and a final rapid withdraWal at the completion of the grinding operation.

AnotherA object of the present invention is the provision of an improved machine which may be employed either for reproduction of cam shafts from a master cam or may itself be satisfactorily employed for the formation of the master cam.

An additional object of the present invention is the provision of an improved yieldable control mechanism for the moving parts of a grinder which will insure most efficient and accurate reproduction of a prescribed templet or work pattern.

Other objects and advantages of the present invention should be readily apparent by reference to the following specification taken in connection with the accompanying drawings forming a part thereof, and it will be understood that we may make any modifications in the specific structural details hereinafter disclosed Within the scope of the appended claims, without departing from or exceeding the spirit of the invention.

Figure l is a front view of a machine embodying the improvements in question.

Figure 2 is a vertical sectional view as on the line 2-2 of Figure 1.

Figure 3 isa view similar to Figure 2, but illustrating the several parts in the retracted or disengaging position.

1927. Serial No. 202,108.

Figure 4 is a diagrammatic view of the operatlve parts of the machine and control circuits therefor.

Figure 5 is a fragmentary section on the line 5 5 of Figure l, and

Figure 6 is a detail view of oscillator mechanism.

One embodiment of the invention has been illustrated in the drawings in which similar characters of reference are employed to denote corresponding parts throughout the several views.

The numeral 10 designates the bed or base of the machine, having on the front thereof the guard portion 11, within which is disposed the control patterns and mechanisms for the machine. These include the bar 12 bearing a number of knife edged disks 13 retained in a longitudinally adjusted position on the rod as by set-screws 14.

There is also contained within this guard portion the master earn shaft 15, bearing a plurality of master cams 16 of size and shape to properly guide or shift the wheelhead for accurate production of proper cam portions 17 on the .shaft 18 being ground. By reference to Figures 1 and 5 it will be noted that shaft 18 is suitably locked to rotate with spindle 19 in headstock 20. This spindle is provided with a gear 21 meshing through idler 22 with gear 23 on the stub shaft 24 having flanged head 25 bolted or suitably secured `to head 26 of the shaft l5. The interconnection of parts is such that the two shafts will be simultaneously synchronously rotated. This rotation is effected as by worm 27 meshing with worm wheel 28 on shaft 24. This worm may be continuously operated from any suitable source of power not here specifically illustrated, and serves to rotate the work and its controlling cam at the proper work rotation speed.

The bed 10 is provided with the Ways 29 for the longitudinally shiftable table member 30, which is movable along the bed as by the feed screw 31. This screw is suitably secured on the underside of table 30 and has mounted thereon the gear nut 32 held against longitudinal movement with respect to the bed, so that when the nut is rotated in one the spindle direction or the other'a correspondin movethis movement use is preferabl o effect made of worm 33 on shaft 34 couplablet rough the magnetic clutch 35 or equlvalent mechanism with the reversible drive motor 36. Reversing switch 37 is disposed in the motor line ment will be imparted to the table.

and coupled with actuating handle 38 at the left of the machine. A link 39 in turn connects handle 38 with handle 40 at the right of the machine so that the switch may be actuated from either position to reverse the motor drive. The table 30 is preferably provided with control dogs 41 and 42 at o pposite ends to throw the switch from either operative position into an intermediate neutral position as is diagrammatically indlcated in connection with Figure 4.

In the grinding of cam shafts there are certain conditions to be considered qulte different from ordinary cylindrical grinding of work. The shaft 18 to be ground must be formed with a plurality of cam portions 17 having the points 43 of the cams disposed in' different radial planes as respects the shaft and at intermittent or different longitudinally spaced positions along the shaft. For proper grinding itis therefore necessary that means be provided for imparting an in and out movement to the grinding wheel to produce the proper shape of an individual cam, that means be provided for retracting the grinding wheel away from the work when completed and additional means be utilized for laterally shifting the wheel into engagement with the subsequent portion of the work piece to be ground.

In the preferred embodiment of the invention here illustrated the complete cycle of operation for formation of the entire series of cams on the shaft is shown as beingI automatically performed but it is to be understood that certain of the structural elements are capable of use with manually in place of j 16. It is provided with a piston cylinder 55 automatically controlled cycle.

For effecting the grinding, use is made of the grinding wheel 44 having its spindle 45 suitably journalled in the grinding wheel carriage46. This carriage bears the wheel driving motor 47 which is therefore shiftable as a unit with the grinding wheel. Carriage 46 has guides 48 movable onthe ways 49 of intermediate slide 50. Slide 5() in turn has guides 51 riding on ways 52 of the table 30. As a result, the grinding wheel is movable both with and with respect to intermediate slide 50.

Slide 50 is provided with a bracket 53 having a contact roller 54`for` selective engagement with any one of the master cams in which is slidably mounted a piston 56 having the rod 57 extending rearwardly and bearin an .adjustable contact or screw 58 norma y engaging lug 59o`n table 30. Compressed air or other yieldable fluid is intended to be introduced into cylinder 55 as at port- 60, whereby when portion 58 is in contact with lug 59 holding the piston it- .self stationary the influx or building up of pressure within the cylinder will exert a force against the intermediate slide, urging roller 54 against cam 16. As the Huid is compressible, rotation of the vmaster cam shaft will cause an individual cam toimpart a back and forth reciprocating movement to the intermediate slide and parts associated therewith. The connection between the intermediate slide and the grinding wheel carriage is in the form of a depending iange 61 and piston rod 62. This rod 62 has a threaded connection as at 63 with the iiange andis capable of rotation to adjust the in or out position of the carria e as respects the intermediate slide. This a justment is preferably effected through the train of gears 64 at the rear of the machine, terminating in the stub shaft 65 provided with a mitre gear 66. Gear 67 serves through shaft 68 and pair of gears 69 to operatively connect the gear train 64 with the operating hand wheel 70. Shaft 68 and handle rod 71 are jointly journalled in the swivelled bracket 72 which may therefore be oscillated to present hand wheel in most satisfactory operating position, depending on the general position of the grinding wheel head as respects the operator. It will be understood that the adjustment here indicated is primarily intended for size control as for compensation of wheel wear. To this end screw rod 62 is provided at its forward end with an adjustable stop contact- 73 adapted to engage the electrical stop switch contact 74 supported by lug 59 to limit automatically the inward feeding movement of the grinding wheel. c

The gear train mechanism just described is for purposes of adjustment only, while to normally provide for a relative in and out movement between grinding vwheel and intermediate slide there is secured on the piston rod 62 a piston 75 capable of back and forth movement in the cylinder 76 attached to the intermediate slide, and as controlled by introduction of actuating fluid through either port 7 7 or port 78 as indicated in Figure 4. Introduction of fluid through .the port 77 will move the piston inward relative" to the intermediate slide shifting with it the carriage, this being controlled through reversing valve 79 at a rate determined by pump 8O to cause desired feeding movement" of the grinding wheel relative to the intermediate slide at the same time that the general in and out position of the grinding wheel for shape is secured by interengagement of master cam 16 with roller 54. When the grinding is completed valve 79 is reversed, coupling port 77 with the exhaust side of the l l carrying with it piston hydraulic control system and port 78 with the pressure, so that the piston is retracted from the position shown in Figure 2 to that shown in Figure 3, carrying back the grind- 5 ing wheel carriage with it. Additionally, on this reversal hydraulic lead line 81 forces a given volume of fluid through port 82 into the. rapid return cylinder 83 carried by the table 30. This shifts piston'84 rearwardly rod 85 which is secured to flange 61. In this manner arapid reverse movement of the entire intermediate slide and grinding wheel carriage withdrawing the parts from engagement with l5 the work to a shiftable position as illustrated in Figure 3 is accomplished. This is preferably against the pressure of the com pressible fluid in cylinder 55, with the result that on subsequent reversal of valve 79 allowing pressure in cylinder 83 to exist, the

expansion of the fluid willcause a rapid inward movement of the parts until roller 54 engages its master cam and at the same time a relatively slow feeding movement of the grinding wheel carriage on the intermediate slide.

Figure 4 contains a diagram of the several control mechanisms for rendering the complete cycle of operations of the machine enr tirely automatic.

That the manner of operation of the machine as anentirety may be best understood,

I particular reference is invited to the diagrammatic illustration of the controls contained in Figure 4 in connection with the structural features illustrated and in part previously described. Considering the machine .set with the table at one end of the bed initial lateral movement of the table may be effected by shifting switch 37 from neutral position to close the motor circuit `A--A-A and actuate the drive motor 36.

Coupled with the switch actuating mechanism, including lever 38 is a second switch 184 which controls the line circuit of the machine, so that when the motor switch 37 is in a neutral position all. power will be shut oft from the machine, while when. the switch 37 is actuated to operate the motor in either direction, switch 184 will also be actuated to provide power for energization of the several automatic controls.

At the point of restot` the machine intermediate slide 50 is in retracted position as shown in Figure 3, the limit of this retract-ed motion beingr the interengagement of piston 75 with the rear of cylinder 76. In this posi- 'tion the switch control contact 185 engages rail 86, causing switch 87 to be moved in posiy6C' tion to close the circuit from powerline 88 to y intermediate conductor 89. Suitable means such as spring 90 throws the switch into open position .on disengagement of the contact and rail for the purpose hereinafter described.

The other terminal of line 89 is connected action continues till with switch plunger 91 normally held in a forward position by spring 92, so that switch blade 93 again closes a circuit through line 94, solenoid 95 and ground line 96. This actuation of the solenoid moves core rod 97 inward, closing switch 98 against action of spring 99 and completing circuit 100-101 of the magnetic or magnetically controlled clutch 35. Under these conditions motor 36 will drive worm 33 in the direction determined'by the reversing switch and will thus actuate nut 32 and move the table toward the left if the parts are in the position indicated in Figure 1. As the table progresses in this direction, switch plunger 91 is brought into engagement with the first of the series of disks 13 which depress the plunger with a snap effect on switch b-lade 93, breaking circuit 94, deenergizing solenoid 95 when spring 99 opens switch 98 and causes disconnection of clutch 35 stopping the traverse of the table.

At the same time the movement of the switch blade 93 closes through line 102 and ground line 96.1 the circuit of solenoid 103. 'lhis solenoid actuates shift rod 104 to the left or into position shown in Figure 4, reversing the eti'ect of the hydraulic circuit. The flow will then be 'from pump 80 through line 77 to the rear ot thc piston 75 moving the piston forwardly in the cylinder and causing the inteed movement ot the grinding wheel and grinding wheel carriage relative the intermediate supporting slide. At the same time the relief of pressure on the forward side of pistons 75 and 84 allows eX pansi'on of the fluid in cylinder 55 to move the intermediate slide forward, so that roller 54 engages the appropriate master dcam 16, the position of disk 13 being such that the cross feed is stopped in proper alinement with this master cam. Consequently, as the work and master cam shaft are correspondingly rotated the in and out motion following the master cam will be imparted to the intermediate slide and grinding 'wheel carriage mounted thereon as previously described. At the same time through action o't piston 75 there will be a lgradual inward feeding movement of the grinding wheel itselt' with respect its movable intermediate slide as the stock is removed rom the article being ground. This the article has been reduced to proper size, at which time the adjustable contact screw 73 on the front ot the piston rod 63 will contact with and actuate switch member 74. This serves to close the wheel feed reversing circuit 1051OG-107, which includes a solenoid 108.

As the inward movement of the intermediate slide has withdrawn contact 185 from engagement with rail 86, the circuit through solenoid 103 has been broken and the solenoid is no longer operative. Consequently,

solenoid 108 may shift rod 104 to the right I'T- reversing valve 7 9'through action of the rack 109 and segment 110. This reversal will cause the volume of fluid in the pressure line to flow into cylinders 76 and 83 with a consequent reversal of movement of both intel'- mediate slide and grinding wheel to the positions shown in Figure 3.

On this movement disengagement of contact 73 and switch 74 releases this switch breaking the circuit through solenoid 108, the valveremaining stationary however, so that the parts remain as described until in rearmost position when the normally opened switch 87 is again closed completing the c ir, cuit 88-89. This again actuates clutch 35 to cause a cross feed of the table till again stopped by engagement of the next disk 13 with the switch plunger 91 and the cycle is repeated in sequential cross feed, infeed grinding and return movements until the entire series of disks 13 have been utilized and the proper cams ground. Continued motion of the table will then bring dog 42 intor engagement with lever 38, throwing the switch 37 coupled therewith into its neutral position and breaking the entire circuit switch 184 when the entire machine will come to rest. A new work piece can then be readily introduced by the operator and the :switch 37 thrown in reverse direction reversing motor 36. Inasmuch as this closes the main line circuit switch 184 and the switch setting of the solenoid circuit 94-96 has not been disturbed, clutch will again be actuated and the table shifted in a reverse direction under control of the switch plunger 91 and other parts. The machine thus automatically operates in an identical manner in both directions to perform a complete series of operations and finally come to rest. It will be particularly noted that by the construction here provided the only requirements of the operator are the removal and replacement of work pieces and a proper gauging or checking to make sure that proper size is being maintained by suitable inward adjustment of the grinding wheel when necessary. Consequently, a single operator can satisfactorily handle several machines resulting in maxlmum production per man hour of labor.

To avoid grooving of the grinding wheel during the reproduction of a large number of work pieces, a suitable mechanism is preferably provided for imparting slight oscillation to the grinding wheel spindle 45. A suitable mech ani sm for this purpose is illustrated in Figure 6 and comprises a barrel cam 111 having a cam groove 112 and an opposed barrel cam 113 having the cam groove 114. Intermeshing gears 115 and 116 on the two cams serve to rotate same, but due to a difference in number of teeth on gears there is a slight differential in speed rotation. Carried by the casing 117 therefor is a guide 118 for the cam block 119 which is jointly engaged in grooves 112 and 114. Consequently, as there is a differential rotation of the two grooves the pin will follow groove 114 since this cam is fixed against axial movement andl will cause a relative back and forth axial shifting of the grinding wheel spindle 45, as should be readily apparent by reference to Figure 6.

1. A machine of the character described, including a work support and a grinding wheel, means for automatically varying the relationship of the parts during grinding to control the shape produced on a work lece by the grinding wheel, means for relatlvely shifting said parts in an angularly related direction to vary the general area of the work engaged by the grinding wheel, and means for automatically stopping all relative movement of the parts when a series of sequential grinding operations on a plurality of axially displaced portions of the work has been completed.

2. A machine of the character described, including a bed, a work holder and a pattern supported by the bed for synchronous rotation, a slide supported on the bed and having a pattern follower, means for urging the pattern and follower into engagement one with the other, a grinding wheel carriage mounted on the slide and movable therewith and relative thereto, and means for automatically effecting the relative movement of the carriage and slide to progressively remove stock from a work piece in the work holder in a path continuously determined by the pattern and follower.

3. A machine of the character described, including a bed, a Work holder and a pattern supported by the bed for synchronous rotation, a slide supported on the bed and having a pattern follower, means for urging the pattern and follower into engagement one with the other, a grinding wheel carriage mounted on the slide and movable therewith and relative thereto, means for automatically effecting the relative movement of the carriage and slide to control the rate of progress'ive stock removal, and additional means for positively relatively adjusting the slide and carriage te vary the ultimate effective position of the grinding wheel surface.

4. A machine of the character described, including a bed, a work holder and a pattern supported by the bed for synchronous rotation, a slide supported on the bed and having a pattern follower, means for urging the pattern and follower into engagement one with the other, a grinding wheel carriage mounted on the slide and movable therewith and relative thereto, means for automatically effecting the relative movement of the carriage and slide, and means for automatically limiting the work approaching movement of the grinding wheel carriage irrespective of the movement of the slide.

5. A machine of the character described, including a bed, a work holder and a pattern supported by the bed for synchronous rotation,a slide supported on the bed and having a pattern follower, means for urging the pattern and follower into engagement one with the other, a grinding wheel carriage mounted on the slide and movable therewith and relative thereto, means for automatically effecting the relative movement of the carriage and slide, means for iting thework approaching movement of the grinding wheel, and means for automatically retracting the grinding wheel carriage wit respect to the slide.

6. A machine of the character described, including a bed, a work holder and a pattern supported bythe bed for synchronous rotation, a slide supported on the bed and having a pattern follower, means for urging the pattern and follower into engagement one with the other, a grinding wheel carriage mounted on the slide and movable therewith and relas tive thereto, a grinding wheel on the carriage,

means for automatically eecting the relative movement of the carriage andslide,

' tion, a

means for automatically limiting the work approaching movement of the grinding wheel, a device operable by the limiting means for retracting the grinding Wheel to an inoperative position, and means for axially shifting the grinding wheel unit when in retracted position.

A machine of the character described, including a bed, a work holder and a pattern supported by the bed for synchronous rotaslide supported on the bed and having a pattern follower, pattern and follower into engagement one with the other, a grinding wheel carriage mounted on the slide and movable therewith and relative thereto, means for automatically effecting the relative movement of the parts,

means for automatically limiting the work approaching movement of the grinding wheel and for retracting the grinding wheel to an inoperative position, means for axially shifting the grinding wheel unit Vwhen in re- .p tracted position, and means for automatically checking said axial shifting movement.

8. A machine of the character described, including a bed, a work holder and a pattern supported by the bed for synchronous rotation, a slide supported on the hed and having a pattern follower, means for urging the pattern and follower into engagement one with the other, a grinding wheel carriage mounted on the slide and movable therewith and relative thereto, means for automatically effecting the relative movement of the parts, means for automatically limiting the work approaching movement of the grinding retracting the grinding wheel automatically lim-- means for urging thel to an inoperative position, shifting the grinding wheel unit when in retracted position, means for -automatically checking said axial shifting movement, and means operative on checklng of the axial movement of the grinding wheel unit for reversely shifting the wheel to cause the same to reengage a work piece.

9. A machine of the character described, including a work support and a Wheel support, means for relatively shifting said parts in two directionsat right angles one to the other, said means including an hydraulic mechanism for effecting the relative approach and retraction of the parts, automatic electric controls for actuating said hydraulic mechanism, and additional automatic means for intermittently relatively shifting the parts in an axial direction.

10. A machine of the character described, including a work support and a grinding wheel support, means for relatively shifting said parts inv two directions at right angles one to the other, said means including an hydraulic mechanism for effecting the relative approach and retraction of the parts, automatic electric controls for actuating said hydraulic mechanism, automatic means for intermittently relatively shifting the parts in an axial direction, and supplemental means for imparting an axial oscillatory movement to the grindmg wheel.

' 11. A machine including a bed, a work support carried thereby, a table slidably mounted thereon for movement axially of the work support, an intermediate slide carried by the table for movement toward and from the support, a carriage mounted on the slide for movement therewith and relative thereto, a grinding wheel on'the carriage, means for urging the slide in the direction of the Work support, a pattern member for controlling the movement of the slide, means for automatically shifting the carriage on the slide in a direction toward the work at apslow rate of speed, means for limiting this approaching movement, and additional means for rapidly separating the work and grinding wheel subsequent to the operation of the limiting means.

12. A machine of the character described, including a bed, a work support carried thereby, a table slidably mounted thereon for movement axially of the work support, an intermediate slide carried by the table for movement toward and from the support, a carriage mounted on the slide for movement therewith and relative thereto, a grinding wheel on the carriage, means for urging the slide in the direction of the work support, a pattern member for controlling the movement of the slide, means for automatically shifting the carriage on the slide in a direcmeans for axially A grinding ment, means for rapidly separating the work and grinding wheel subsequent to the operation of the limiting means, means for imparting sliding movement to the table, a normally open electric control circuit for .said means, and means for closing the circuit on reverse movement of the grinding wheel to laterally shift the wheel when in withdrawn position.

13. A machine of the character described, including a bed, a work support carried thereby, a table slidably mounted thereon for movement axially of the work support, an intermediate slidecarried by the table for movement toward and from the support, a carriage mounted on the slide for movement therewith and relative thereto, a grinding wheel on the carriage, means for urging the slide in the direction of the work support, a pattern member for controlling the movement of the slide, means for automatically shift-ing the carriage on the slide in a direction toward the work at a slow rate of speed, means for limiting this approaching movement, means for rapidly separating the work and grinding wheel subsequent to the operation of the limiting means, means for imparting sliding movement to the table, a normally open electric control circuit for said means, means for closing the circuit on reverse movement of the grinding wheel to laterally shift the wheel when in withdrawn position, and means for .adjustably limiting the lateral shifting of the grinding wheel.

14. A machine of the character described, including a bed, a work support carried thereby, a table slidably mounted thereon for movement axially of the work support, an intermediate slide carried by the table for movement toward and from the support, a carriage mounted on the slide for movement therewith and relative thereto, a grinding wheel on the carriage, means for urging the slide in the direction of the work support, a

pattern member for controlling the move.

ment of the slide, means for automatically shifting the carriage on the slide in a direction toward the work at a slow rate of speed, means for limiting this approaching movement, means for rapidly separating the work and grinding wheel subsequent to ,the operation of the limiting means, means for imparting sliding movement to the table, a normally open electric control circuit for said means, means for closing the circuit on reverse movement of the grinding wheel to laterally shift the wheel when in withdrawn position. means for adj ustably limiting the lateral shifting of the grinding wheel, and means for stopping the entire machine when a work piece has been completed thereby.

15. A machine of the character described, including a bed or. support, a work holder .carried thereby, a grinding wheel supported thereon, means forl imparting relative advancing and retract-ing movement to said parts for grinding, means for imparting a supplemental relative shifting of the parts during grinding whereby an irregular shape is formed on the work piece, means for relatively laterally shifting the parts when in separated position to present new portions of the work in opposition to the grinding wheel, and controls for the several shifting movements to sequentially actuate the parts whereby a series of portions of desired configuration will be sequentially automatically produced on the work.

16. A machine of the character described, including a bed or support, a work holder carried thereby, a grinding wheel supported thereon, means for imparting relative advancing and retracting movement to said parts for grinding, means for imparting a supplemental relative shifting of the arts during grinding whereby an irregular s ape is formed on the work piece, means for relatively laterally shifting the parts when in separated position to present new portions of the work in opposition to the grinding wheel, controls for the several shifting movements to sequentially actuate the parts whereby a series of portions of desired configuration will be sequentially automatically produced on the work, and additional means for automatically rendering the several shifting mechanisms inoperative at a predetermined point in the cyclic movement thereof.

17. A machine of the character described including a bed or support, a work holder and a pattern holder carried thereby, a slide supported by the bed and movable in the direction of the work and pattern holder, a grinding wheel mounted on the slide for movement therewith and relative thereto, a lug projecting from the bed, means on the slide cooperating with the lug for urging the slide in the direction of the pattern, and means on the carriage cooperating with the lug to limit the movement of the carriage in said direction.

18. A machine of the character described including a bed or support, a work holder and a pattern holder carried thereby, a slide supported by the bed and movable in the direetion of the work and pattern holder, a grinding wheel mounted on the slide for movement therewith and relative thereto, a lug projecting from the bed, means on the slide cooperating with the lug for urging the slide in the direction of the pattern, and means on the carriage cooperating with the lug to limit the movement of the carriage in said direction, and means including an electric circuit controlling device and means associated with said device for reversing the direction of movement of the carriage.

19. In a grinding machine the combination with a bed, of a table translatably mounted thereon, a grinding wheel supported by the table and movable transversely thereon, a means for controlling the relative movement of the several parts including a drive for translating the table, a second drive for shifting the grinding Wheel relative to the table, means operated by movement of the grinding Wheel in one direction for initiating movement of the table in a predetermined direction, and means discontinuing the table movement and initiating movement of the grinding wheel in a reverse direction.

20. A grinding machine of the character described including a bed or su rt, a table mounted for movement longitu mall f of the ed, a 'grinding wheel supported i for movement therewith and for movement thereon, transversely of the bed, automaticmechanical means for longitudinally shifting -the table on the bed, automatic hydraulic means -for shifting the grinding Wheel relative to the table, a sequential engageable electric control actuated by movement of the table, a grinding wheel for controlling the operation of the mechanical and hydraulic actuating device in predetermined cyclic sequence.

21. A machine of the character described the combination oi a bed with a grinding member movable longitudinally and transversely with respect to the bed, and means for automatically moving the grinding wheel in a plurality of cyclic paths each comprising a feeding movement and retracting movement and a transverse shifting movement While retracted, whereby the grinding Wheel is successively brought into operative engagement with a plurality of axially spaced portions of an individual work piece.

22. A machine of the character described the combination of a bed with a grinding member movable longitudinally and transversely with respect to the bed, means for automatically moving the grinding wheel in a plurality of cyclic paths each comprising a `feeding movement and retracting movement and a transverse shifting movement while retracted, whereby the grinding Wheel is successively brought into operative engagement with a plurality of axially spaced portions of an individual Work piece, and means for imparting a supplemental reciprocating movement to thel grinding wheel to cause theWheel to traverse the portion of work being operated upon.

23. A machine of the character described the combination of a bed with a grinding member movable longitudinally and transversely with respect to the bed, a means for automatically moving the grinding Wheel in a plurality of cyclic paths each comprising a feeding movement and retracting movement and a transverse shifting movement while retracted, whereby the grinding wheel is successively brought into operative engagement with a plurality of axially spaced porby tie table th ycoupled With said tions of an individual work piece, means for imparting a supplemental reciprocating movement to the grinding wheel to cause the Wheel to traverse the portion of Work being operated upon, and additional means for imparting a back and forth movement to the t grinding Wheel relative the Work during feeding. whereby irregular or non-circular contour may be produced on a rotating Work piece.

24. A combination with a grinding machine including a bed and a table movable longitudinally of the bed, of a grinding wheel su ported by the table and movable transverse y ereon, means for imparting movement to the table and to the grinding Wheel, a control circuit actuable by movement of the grinding Wheel in one direction for initiating movement of the table in an angularly related direction, means :for limiting the movement of the grinding Wheel in said direction, meansfor automatically checkin the table movement at a predetermined posltion in the stroke thereof.

25. A combination with a grinding machine including a bed and a table movable longitudinally of the bed, of a grinding Wheel supported by the table and movable transversely thereon, means for imparting movement to the table and to the grinding Wheel, a control circuit actuable by movement of the grinding wheel in one direction for initiating movement of the table in an anglarly related direction, means for limiting the movement'of the grinding Wheel in said direction, means for automatically checking the table movement at a predetermined position in the stroke thereof, a supplemental circuit last named means, and a controlling device actuable by said circuit to move the grinding Wheel in the opposite direction.

26. A combination with a grinding machine including a bed and a table movable longitudinally of the bed, of a grinding Wheel supported by the table and movable transversely thereon, means for imparting movement to the table and to the grinding Wheel, a controlled circut actuable by movement of the grinding Wheel in one direction for initiating movement ot' the table in an angularly related direction, means for limiting the movement ofthe grinding Wheel in sai-d direction, means for automatically checking the table movement at a predetermined position in the stroke thereof, a supplemental circuit coupled with said last named means, a controlling device actuable by said circuit to move the grinding Wheel in the opposite direction, a stop member for limiting and determining the movement of the grinding Wheel in said latter direction and means disposed in the path of said member for reversing the direction of movement of the grinding Wheel.

' ber and slide to respectively 27. A machine of the character described, the combination with a bed or support and a table translatable thereon, of means 'for feeding the table in either direction, a control member shiftable with the table for interrupting the movement thereof and a plurality. of contact members disposed adjacent the table for stopping the table at a plurality of operative stations, the co-acting engagement between said members being such as to automatically stop the table at the several prescribed stations irrespective of the direction of movement of the table.

28. A machine of the character described including a bed` a Work support and pattern support carried thereby, a slide movable transversely of the bed and having a contact for engagement With the pattern, a grinding member carried" by the slide and movable therewith and relative thereto, hydraulic means for urging the slide in the direction of the pattern, additional hydraulic means for shifting the grinding member rela-tive to the slide in the direction of the work while restricting the movement of the grinding member relative to the slide, whereby the pattern may control the general forming movement thereof and means for hydraulically rapidly retracting the grinding memdisengage the Work and pattern.

29. A machine of the character described including a bed or support, a Work holder carried thereby, a grinding Wheel supported by the bed, means for imparting relative advancing and retracting movement to said parts for grinding, means for relatively axially shifting the parts from station to station for sequential operation on a spaced portion of a Work piece in the Work holder, said means including a reversible driving member,

and means for intermittently coupling said' member with one of the parts for shifting thereof in the direction determined by the direction of operation of the driving member, and means for rendering the driving member ineffective at a plurality of predetermined stations irrespective of the direction of actuation of the parts thereby.

30. A machine of the character described including a bed or support, a Work holder and a pattern holder carried thereby, a slide mounted thereon having a portion for cooperation with the pattern, a grinding Wheel carriage mounted on the slide for movement therewith and relative thereto in the direction of movement of the slide, means for imparting a rapid movement to the slide in a direction toward the pattern, means for imparting a slow feeding movement to the grinding Wheel carriage as respects the slide and in the direction of the rapid advance of the slide, and means for rapidly jointly retracting the slide and carriage.

including a bed or support, a work holder and a pattern holder carried thereby, a slide mounted thereon having a portion for cooperation with the pattern, a grindingwheel carriage therewith and relative thereto in the direction of movement of the slide, means for imparting a rapid movement to the slide in a direction toward the pattern, means for imparting a slow feeding movement to the grinding Wheel carriage as respects the slide and in the direction of the rapid advance of the slide, means for rapidly jointly retracting the slide and carriage, and means for cushioning the retracting movement of said parts.

In testimony whereof we aiiix our signatures.

ROBERT E. W. HARRISON. FRED S. HAAS.

3 1. A machine of the character describe'djmounted on the slide for movement"