US2010361A

US2010361A - Grinding machine

Info

Publication number: US2010361A
Application number: US444581A
Authority: US
Inventors: Robert E W Harrison
Original assignee: Cincinnati Grinders Inc
Current assignee: Cincinnati Grinders Inc
Priority date: 1930-04-15
Filing date: 1930-04-15
Publication date: 1935-08-06
Anticipated expiration: 1952-08-06

Description

Aug. 6, 1935. R E. w.- HARRISON 2,010,361

GRINDING MACHINE Filed April l5, 1.930 4 Sheets-Sheet l Aug. 6, 1935. R. E. w. HARRISON 010,361

GRINDING MACHINE Filed April 15, 195o 4 sheets-.sheet 2 l Aug. 6, 1935. R; E WQHARRISON 2,010,361

GRINDING MACHINE Aug- 5, 1935. 1 R, E. w. HARRlsoN y 2,010,361

l GRINDING MACHINE Patented ug. 6, 1935 UNITED lSTATES GRINDING MACHINE Robert E. W. Harrison,

to Cincinnati Grinders Cincinnati, Ohio', assigner Incorporated, Cincinnati, Ohio, a corporation of Ohioi Application April .15, 1930, serial No. 444,581

11 Claims.

This invention relates to improvements in grinding machines and has particular reference to automatic mechanism for cyclic performance of cylindrical grinding operations. Y

One oi the principal objects of the invention is the provision of an improved mechanism for simultaneously forming and nishing a` plurality of work pieces to the same form and size for individual interchangeable use in similar articles of manufacture.

Another object of the invention is the provision of an automatically controlled machinetool of the center or chucked-Work type which shall automatically effect the rotation `of the work, Vthe feed thereof into a grinding wheel, a reciprocation of the work across the face of the wheel to break up grinding lines and a ref traction of the work from the wheel followed by a complete stopping ofthe various parts at the completion of the cycle. Y

An additional object of the present invention is the provision of an improved work holding and driving mechanism which will greatly increase the efficiency of the machine while operating and the finish on work pieces su'ch as clutch disks or other work pieces of circular contour but of relatively thin or narrow width.

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

Figure 1 is a side elevationof a machine embodying this invention.

Figure 2 is a sectional View oi' Figure 1.

Figure 3 is a sectional View taken on line 3--3v o Figure 2V.

Figure 4 is a fragmentary sectional view taken longitudinally through the right handportionY of the machine as seen in Figure 1.

Figure 5 is a sectional view takenv on line 5-5 of Figure 4.

Figure 6 is a sectional view, partly in elevation as seen from line 6--6 of Figure 1. Figure 7 is a sectional View taken on line 'I-T of Figure 1.

Figure 8 is a sectional view taken on line -8'- o! Figure 7.

taken on line v2--2 (Cl. 51e-95)" Figure 9 is a sectional view taken on line 9-9 oi Figure 5. i

Figure 10 is a perspective view of one of the individual work pieces illustrating a type of work piece that may be machined on a device of this 5 invention. A

Throughoutthe severalviews of the drawings similar reference characters are employed to denote the same or similar parts.

AV device oi this invention may comprise a bed l0 I5 having mounted thereon a grinding wheel I 6 rotatable in a clockwise direction at a high or grinding rate of speed. The grinding wheel I 6 is supported by the usual spindle journaled in a bracket or housing I1 secured to the bed I5.v

Supported by the bed in opposition to the grinding wheel I6 is a housing or'unit I8 having journaled therein a spindle or shaft I9 rotatable in a clockwise direction at a relative slow rate of speed by any desirable means, to be later described. The forward end of the shaft I9 is provided with bearings 20 and 2 I on which is mounted'arsle'eve 22. A ang'e 23 is formed on the sleeve near one end thereof and forms an abutment for aplurality of Work pieces 24, hereshown as clutch facings or the like being circular in shape and having a bore 25 centrally thereof. The diameter of the sleeve 22 is such as to be just received in' the bore' 25 in the work piece so that no lost motion or play exists between the surface of the sleeve and the inner surface of the bore. To secure the work pieces to the sleeve it is provided with a threaded portion 2G for clamp nut or the like 21. A spacer' collar 28 is interposed between the nut 21 andv face of the 36` work piece 24. Thesleeve 22' is adapted to be locked to the' shaft I9' so as to rotate therewith and to this' end lias extending through it a pin 29 received in" bayonet slot 3i! formed in the extreme end of the spindle or shaft I9.

To lock the sleeve 22 on the shaft or spindle I 9 the 'said sleeve is placed 'thereon withthe bore therein engaging the bearings 2U and ZI whereupon it isgiven a partial revolution in a counter clockwise direction to' insert'V the pin 29 within 45 the walls of the bayonet slot 30; y

The work supporting unitl is secured to a slide movable longitudinally of the bed tol ward and from the grinding wheel to vary the separation of the axes of the shaft IS and grind- 59 ing wheel I6 to adapt or change the capacity or size of the machine for grinding a different size of work piece. Thev slide 35 is therefore supported by an oscillatfable slide 36' and' any suitable or desirable means may be employed for worm wheel 5l on one end of shaft 68.

effecting the adjustment of the said slides 35 and 36. For example, and as shown in the drawings, this means may comprise a sleeve nut |35 secured in the unit or head |8 and having its internal threads in Jthreaded engagement with the threads |36 on the adjusting screw |31. This screw |37 is rotatively journaled in a bearing bracket |38 secured to the oscillatable slide 35 at or nearits outer end. The adjusting screw |57 projects from and beyond the bearing |38 to receive a pilot or hand wheel |39 whereby the said screw is rotated.

As was mentioned above, the slide 35 is supported by an oscillatable slide 36 which has depending near one end thereof the lugs 3? spaced on opposite sides of similar lugs 38 extending upwardly from a bed plate 39. Trunnions lill extend through aligned bores formed in the lugs 3l and 38 and the said trunnions are secured in the lugs 3'! by set screws lil. The other end of the slide 35 has secured therein a guide sleeve through which a cam follower 53 is adjusted. The cam follower i3 rotatably supportsI a roller 4G and the follower has a threaded perforation 135 thereinreceiving the threaded end of adjusting screw i5 The screw 45 is limited in its axial movement relative to the guide sleeve 43 by a collar 4l formed thereon abutting an anti-friction thrust bearing B8 supported by the upper end of the sleeve 42. The body of the screw is journaled in a cover plate 45 secured to the slide 35 and the said screw is prevented from inadvertent disassociation from the cover plate 69 by a' screw 55.

Rotatably supported by the bed I5 for rotation ina plane parallel to the roller i4 is a cam 5| keyed or secured to a shaft 52 rotatably connected through suitable transmission gearing with a prime vmover 53. Prime mover 53 transmits power through sprocket chain 54 enclosed within housing 55, see Figure 1, and extends about a driving pinion 55 keyedV or otherwise secured to a sleeve 51'loosely journaled on shaft 58. The pinion 56 has integral therewith a flange 59 forming one member of multiple disc friction clutch @El having alternate discs 6| connected therewith. The intermediate discs 52 are keyed or otherwise secured to a hub G3 forming the other member of the friction clutch. The clamp dogs Gli are carried by the flange on themember 63 and are adapted to be actuated about their pivot by sliding member or clutch spool 65. The driven shaft 58 has formed integral therewith or secured thereto a worm 65 meshing with A spur gear 55 is secured to tlieshaft 68 or it may be formed integral with the worm wheel 6l for rotation therewith and meshes with spur gear 'lil on transverse shaft Connected withthe gear E5 by a connecting sleeve 'l2 is a pinion '|3 in turn meshingwith driving gear 14 on the end of longitudinal' shaft '|5 extending longitudinally of the bed across the forward face of the machine. The saidv shaft 'l5 is journaled at one end in suitable anti-friction bearings 'i6 supported by the housing Tl mounted on the rear of the bed i5 and enclosing the transmission gearing just described. The inner -end of thelongitudinal drive shaft i5 is journaled in ann-friction bearings lla and '18 supported by ythe bracket "9 secured to the forward face of the bed |5 in alignment with the trunnions 4D.

The said drive shaft l5 has formed on its inner end, intermediate the bearings 'lla and T8, an eccentric crank 8U for actuating a cross head,

indicated in general by the numeral 8| in Figure 5. The cross head 8| comprises a block 52 having formed therein an elongated angular opening 83 providing walls or guide ways Sli and B5. Within the opening 83 is a pair of sliding members 8E and 8l having on one side thereof plane faces for engaging the seats 5:2 and 85 and on the other side arcuate seats 33 and 39 engaging the crank 8i) at points diametrically opposite one another. The block or head 82 hasrextending therefrom a link provided on its inner end with a ball 9| received in socket 92 secured by cap screws or the like 53 to the outer lug El depending from the carriage 55. The cross head 82, in addition, is provided with guides 9d and for sliding engagement with strips or guides 55 and 91 secured to bracket or housing 79.

Rotation of the drive shaft i5 through the crank 8B will exert first a push and then a pull on the blocks 88 and 8l causing them to shift vertically along the guides 84 and 85. At the same time cross head 8| is horizontally shifted across the guide strips 95 and 9"! for correspondingly axially shifting the link Sil and slide This shifting of the slide breaks up the grinding lines and produces the desired nish on the surfaces of the work pieces being ground by the grinding wheel iE.

During the transverse shifting of the slide 36 the Worm 95 integral with or secured to shaft 58 is in mesh with a worm wheel 59 keyed or otherwise secured to a shaft 52. By this it will be seen that the cam is rotated at the same time that the slide is reciprocated. so that the work pi -ces are being fed into the grinding wheel to reduce them io the proper size and form. For this purpose the cam is provided with a low spot itil at which time the work pieces and sleeve are spaced from the grinding wheel for replacing them with an unfinished unit. rihe cam 5l rotates in a counter clockwise direction and is provided adjacent the low point |55 with an abrupt rise ||i| for rapidly bringing the work pieces into position for operation thereon by the grinding wheel. The abrupt rise portion E51 extends to substantially a point from which point to a point at substantially |53 the eccentricity of the cam is relatively small for feeding the work piece into the wheel at the desired rate. A short concentric portion on the cam extends from the point |53 permitting the workvand wheel to spark out whereupon the cam abruptly falls away for again rapidly retracting the work piece from the wheel. As the wheel wears and it becomes necessary to take up said wear it is only necessary to rotate the screw 5G with a removable crank adapted to be secured to the angularly formed portion |04 thereon.

The machine is adapted to completely finish one set of work pieces and stop at which time the finished work pieces are replaced by an unfinished set. In order that the maximum production may be obtained from the machine use is made of more than one sleeve chuck 22 so that when one set of work pieces is being ground another sleeve chuck is being loaded with unfinished work pieces to be placed on the spindle |9 when the other is removed To automatically effect the stopping of the machine at the completion of one cycle the cam 5| is provided with a ange'lii5 having formed therein a notch I 55 in which roller Sul is adapted to be received. Roller iii? is carried on the end of the shifter rod 58 coupled through coupling |09 with shifter fork ii. The fork MQ is pivoted at and carries at its lower end suitable rollers H2 received. in circumferential groove I I3 formed in the clutch spool65whereby itisshifted. Secured to the upper end of shifter fork H0 is a link H4 connectedv with starting.

lever ||5 pivoted to a rod H6 extending parallel with driven shaft 1,5. A springrl surrounds the rod |08 and abuts on one end with the shoulder H8 integral with housing H9 and on the other end abuts collar I2!! surrounding the said rod `From ,this it will be seen that as the grinding operation is completed the notch |95 will register with roller |01 allowing the spring V| to expand carrying withit theshifter fork H0 to shift the clutch spool to the .left as seen in Figure 7 and disengage friction discs GIand G2 cutting off therdrive to shaft 58 and stopping the rotation of the worm 56 and driven shaft 15.

The rotation of the spindle |9 and work pieces carried thereby are simultaneouslystopped at the time the clutch vdisks 6| and 62 are separated. This spindle is rotated by a motor mounted interiorly of the housingl |26 forming a part of work supporting unit I8. The motor 25 drives a worm-|21 in mesh with a worm wheel |28 for rotating a countershaft` |29 to which the said worm wheel is secured. Atransmission belt |30 extends about a pulley |3| on the countershaft |29 and about a pulley |32 fast` on the spindle I9. Aswitch |23 is secured to Vthe forward face of the bed I5 for controlling the rptation of the motor |25 and includes a depressible plunger |22. This plunger |22 is normally held down bya cam member |2| carried by `shaft or pivot rod H6; theplunger being spring loaded so thatfupon removal of the cam IZI it will be actuated toV break the motor circuit.

The shifting ofthe plunger |08 under the influence of spring lI |I causes as noted above, an actuation of the fork H0 to disengage the clutch disks 5| and d2 and at the same time through the link H4 a rocking of the pivot bar rI I6 to which the cam member |2| is secured. From this it will be noted that switch I 23 is lopened to stop the rotation of the motor |25 at thesame time `that the rotation of the cam 5| and driven `shaft Vl5 are stopped. The parts of the machine are then in position to remove the chuck sleeve 22 and finished work pieces from the spindle |9and replace same with another chuck sleeve containing av set of unfinished work pieces.-

What is claimed is: y

l. in Ya grinding machine the combination of a bed, a grinding wheel carried thereby, an oscillatabie work support, a cam for oscillating the support in direction toward and from the grinding wheel to eifect a stock removal from the work pieces, a prime mover for rotating the work, a. second prima mover f or rotating the. cam, a switch yfor controlling the Work rotating prime mover,

a separable clutch for connecting and disconnecting the second prime mover with the cam, and common means for connecting and disconnecting the switch and clutch whereby the rotation of the work and cam are simultaneously controlled.

2. In a grinding machine the combination oi a bed, a grinding wheel carried thereby, a carriage pivotally supported by the bed, a work support car.- ried by the carriage comprising a spindle, a work holderremovably connected withrthe spindle, a cam for oscillating the carriage about its pivot in a direction toward and from the grinding wheel, a prime mover for effecting a rotation of i the work support spindle, a driven shaft, a separable clutch for connecting the driven shaft with the cam for controlling the actuation thereof, means for reciprocating the carriage axially of the work spindle, means operatively connecting the reciprocating means with the driven shaft controlled by the separable clutch, a switch controlling rotation `of the work rotating prime mover, and a common means for actuating switch and clutch whereby the various movements of the parts are simultaneously started and stopped.

3. In a device of the class described, the combination of a bed, a grinding wheel carried thereby, a work supporting and controlling unit in cluding a carriage pivotally secured to the bed, means for oscillating the carriage about its pivot comprising a rotatable cam, a driven shaft, transmission mechanism between the cam and driven shaft whereby the cam is rotated, a separable clutch on the driven shaftcontrolling the rotation thereof, a prime mover carried by the carriage for rotating the work, and means disconnecting the separable clutch and stopping the rotation of the prime mover at the completion of the grinding operation.

4. In `'adevice of the class described the combination of a bed, a grinding wheel rotatably carried thereby, means carried by the bed for supporting and rotating a work piece while in engagement with the grinding wheel, means for effecting a relatively short reciprocation of the work across the face of the grinding wheel comprising a support for the work piece, a cross head carried by the support, a rotatable shaft, a crank on the shaft operatively connected with the cross head, a driven shaft, transmission mechanism between the driven shaft and rotating shaft whereby the crank on the rotating shaft is actuated for effecting a lateral movement of the said cross head and carriage for reciprocating the work across the face of the grinding wheel, means for feeding the work pieces into the grinding wheel while the said reciprocation is being effected and means for stopping both the feeding of the work into the wheel and the reciprocation thereof across the wheel at the completion of the grinding operation.

`5.` In a device of the class described the combination of a bed, a grinding wheel rotatably carried thereby, means carried by the bed for supporting and rotating a work piece while in engagement with the grinding Wheel, means for shifting the work across the face of the grinding wheel comprising a support for the work piece,

a cross head carried by the support, a rotatable shaft, a crank on the shaft operatively connected with the cross head, a driven shaft, transmission mechanism between the driven shaft and rotating shaft whereby the crank on the rotating shaft is actuated for effecting a lateral movement of the said cross head and carriage for reciprocating the Work across the face of the grinding wheel, means for feeding the work pieces into the grinding wheel while the said reciprocation is being effected, means for stopping both the feeding of the work into the Vwheel and the reciprocation thereof across the wheel at the completion of the grinding operation, and means for rea-initiating the cyclic operation of the device.

6. In a grinding machine of the class described for simultaneously grinding the exterior face of a plurality of rings the combination of a bed, a grinding wheel rotatably supported by the bed, an opposed work supporting and rotating unit comprising a revolvable spindle having a projecting nose, a hollow work chuck supporting a plurality of rings adapted to be received on-the nose of the spindle, cooperating means associated with the spindle nose 'and work chuck for securing the chuck to the spindle nose, a carriage for the spindle, a pivotally mounted member carried by the bed and slidably supporting the carriage, means for adjusting the position of the carriage with respect to the pivotally mounted member for varying the position or" the work spindle with respect to the grinding wheel, a rotatable cam carried by the bed, and a cam follower on the pivotally mounted member whereby the said member and parts carried thereby are oscillated toward and from the grinding wheel to eiect a stock removal from the work.

7. In a grinding machine of the class described for simultaneously grinding the exterior face of a plurality of rings the combination of a bed, a grinding wheel rotatably supported by the bed, an opposed work supporting and rotating unit comprising a revolvable spindle having a projecting nose, a hollow work chuck supporting a plurality of rings adapted to be received on the nose of the spindle, coop-erating means associated with the spindle nose and work chuck for securing the chuck to the spindle nose, a carriage for the spindle, a pivotally mounted member carried by the bed and slidably supporting the carriage, means for adjusting the position of the carriage with respect to the pivotally mounted member for varying the position of the work spindle with respect to the grinding wheel, a rotatable cam carried by the bed, a cam follower on the pivotally mounted member whereby the said member and parts carried thereby are oscillated toward and from the grinding wheel to eiect a stock removal `from the work, and means for varying the operative position of the cam follower with respect to the member to vary the throw of the pivotally mounted member and consequently the feed of the work toward the wheel.

8. In a grinding machine of the class described for simultaneously grinding the exterior face of a plurality of rings the combination of a bed, a grinding wheel rotatably supported by the bed, an opposed work supporting and rotating unit comprising a revolvable spindle, a removable work chuck supporting a plurality of rings on the spindle, a carriage for the spindle, a pivotally mounted member carried by the bed and slidably supporting the carriage, means for adjusting the position of the carriage with respect to the pivotally mounted member f or varying the position of the work spindle with respect to the grinding wheel, a rotatable cam carried by the bed, a cam follower on the pivotally mounted member whereby the said member and parts carried thereby are oscillated toward and from the grinding wheel to effect a stock removal from the work, and means carried by the bed oonnectible with the pivotally mounted member for eiecting a limited shifting thereof relative to the bed to correspondingly reciprocate the work with respect to the wheel.

9. In a grinding machine of the class described for simultaneously grinding the exterior face of a plurality of rings the combination of a bed, a grinding wheel rotatably supported by the bed, an opposed work supporting and rotating unit comprising a revolvable spindle having a projecting nose, a hollow work chuck supporting a plurality of rings adapted to be received on the nose of the spindle, cooperating means associated with the spindle nose andwork chuck for securing the chuck to the spindle nose, a carriage for the spindle, a pivotally mounted member car ried by the bed and slidably supporting the carriage, means for adjusting the position of the carriage with respect to the pivotally mounted member for varying the position of the work spindle with respect to the grinding wheel, a rotatable cam carried by the bed, a cam follower on the pivotally mounted member whereby the said member and parts carried thereby are oscillated toward and from the grinding wheel to effect a stock removal from the work, and means operable in synchronism with the cam for stopping the movement of the cam at the conclusion of each complete revolution.

10. In a grinding machine of the class described for simultaneously grinding the exterior face of a plurality of rings the combination of a bed, a grinding wheel rotatably supported by the bed, an opposed work supporting and rotating unit comprising a revolvable spindle, a removable work chuck supporting a plurality of rings on the spindle, a carriage for the spindle, a pivotally mounted member carried by the bed and slidably supporting the carriage, means for adjusting the position of the carriage with respect to the pivotally mounted member for Varying the position of the work spindle with respect to the grinding wheel, a rotatable cam carried by the bed, a cam follower on the pivotally mounted member whereby the said member and parts carried thereby are oscillated toward and from the grinding wheel to effect a stock removal from the work, means operable in` synchronism with the cam for stopping the movement of the cam at the conclusion of each complete revolution, an independent power source for rotating the work and its spindle, a switch therefor, and means for simultaneously closing said switch and initiating the rotation of the cam.

l1. In a grinding machine of the class described for simultaneously grinding the exterior face lof a plurality of rings the combination ofra bed, a grinding wheel rotatably supported by the bed, an opposed work supporting and rotating unit comprising a revolvable spindle, a removable work chuck supporting a plurality of rings on the spindle, a carriage for the spindle, a pivotally mounted member carried by the bed and slidably supporting the carriage, means for adjusting the position of the carriage with respect to the pivotally mounted member for varying the position of the work spindle with respect to the grinding wheel, a rotatable cam carried by the bed, a cam follower on the pivotally mounted member whereby the said member and parts carried thereby are oscillated toward and from the grinding wheel to eiect a stock removal from the work,'means operable in synchronism with the cam for stopping the movement of the cam at the conclusion of each complete revolution, an independent power source for rotating the work and its spindle, a switch therefor, means for simultaneously closing said switch and initiating the rotation of the cam, and yieldable means for opening the switch operable at the end of each complete revolution of the cam.

ROBERT E. W. HARRISON.