US2133006A - Wheel feeding mechanism - Google Patents

Description

Oct. 1'1, 1938. w. H. WOOD WHEEL FEEDING MEcHANrsn Filed NOV. V6, 1936 /VVV///////////////////V// f/ gwuvwbob WHLLHUE H. Waan Patented oei. 11,1938

UNITED sii-Ari: sf PATENT ori-ice y* f Zim.

l" WHEEL mnmomionamsn j Application C. 1938, 86th.! No. 109,34.

The .invention relates to grinding machines,

and more particularly vto 4a grindigwheel feedn ins mechanism;

One object of `Athe'"iriventionjis to provide a.

5 simple, thoroughly practical grinding machine slide" actuating mechanism.v `Another object of the inventionjis to provide a manuallyv controlled hydraulically operated slide y, o movement; jAnotherQobject'of the invention is to' provide a manually controlled, hydraulically actuated slide operating mechanism in which the v speed of movement ofv the control member,'such as a'hand wheel, serves 'toftjcontrolthej rate of iluidpress'ure feeding movement; 'A lfurther ob` ject of the invention is fto provide a combined manually operable nut and screw feed ,and a. hydraulic feed'whicnare arranged so that rota tion 'of the' manually operable Y'feeding 'wheel serves to actuate andcontrolthe positionof a y hydraulic control valveso that-fluidi under pressure servesj'to supplement therotary imiovement of thefeed screwand thereby to control therate of Vinfeeding movement ofi the grinding other obieczswiii'be innert obvious orin 'pointed out hereinafter;

The invention accordingly consists in the feaf 't tures of construction, combinations off elements, and arrangements of parts. as will be exempli-V ed inthe structure to be hereinafter'described,

and the scope o f the application of which be indicated inthe following claims;

In the accompanying drawing l in which is shown `one of various possible embodiments of thev mechanical features of this inventlOll.

Fig." 1 is a cross sectional view through a grinding machine,

" in section; i

Fig. 2 is a'lsectionalview, on an enlarged'jscale,"

40 taken approximatelybn the line? 2-2 of I; and., i ,Y Y, ,v

Fig. 3 is a sectional view, taken approximately on the line'3-`3 of Fig. 1, on an enlargedscalie,l showing the mechanism for actuating the control As illustrated inthe drawing, a grinding ma- '\chine is provided having a base I0 which is prot vided with a wheel slide II slidable' transversely on suitable ways I2. A rotatable grinding `wheel I3 is mounted on a wheel spindle I4 which is supported for rotation in suitable bearings (not The grinding shown) on the wheel slide II.

wheel I3 may be rotated from anyv suitable source of power, either by means of a driving belt from an overhead'countershaft or it may be .within the base or 'on eter feed wheel,

showing theA improved wheel' feeding mechanism, partly intelevation and partly (ci. si-osix driven from an electric motor either mounted the wheel slide II. A work piece I5 is rotatable onta headstock I0 and footstoek `(not shown) which are in turn supportedv on a"l longitudinally movable table I1. 5 The tablel I1 issupported on a V-way Il and a vflat way'Il onl the base III andserves to posif' tion'the work piece Il relative to the operative face of the wheel I3. 't

To produce a reiti've feeding-movement be 10 tween the grinding wheel Il 'and the work piece Il, a suitable feeding mechanism isl provided which may comprise a' "half nut 25 depending from the wheel slide II and meshing with a rotatable cross feed screw 2t which is supported in 15 bearings 21 and 2l, respectively, inA the base Il.

* A manually operable feeding mechanism is provided comprising a manually operable microma such vas that `shown in the prior patent to`-Norton`No. 762,838 dated June 20 14, 1904; Detallsofl-the micrometeradjustment -of thev feed --have been'omitted, since they iare not comideredwpa'rt'of the present invention. Por 'further reference to detailed construction of lthe'inici-onie'ter adjusting' device, 25.

reference may be had to the above mentioned patent. The feedwheel 29 is rotatably moimted on astud Il which also supports agear 3l meshing with a gear l2"mounted the outer end of a rotatable shaft 3l. The shaft 33 is sup- 30 ported in a suitable bearing'llin the base Il, and is providiedat` its end with a pinion 36 which meshes with a gear 31 which is keyed on va reducedportion Il of the rotatable cross feed screw 2.0.'V ItJA will bereadily apparent from 35 the foregoing disclosure that rotation of the manually operable feed wheel '2l trananits motion through the gears Il, 32, 3l and 31 to rotate the cross feed screwand cause a relative utilized to cause a grinding feed. 45 In the construction, a'suitable fluid preme mechanism is provided which is arranged to move. the slide II so as to cause either a'rapid approaching or receding movement between the` wheel and work and to causefa slow s0 approaching movement during'the grinding operation. 'Ihis mechanism maycomprise a fluid pressure cylinder 40 supported on the base Il and having a piston 4I slidably mounted therein inaxialalignmentwiththefeedscrewt The f scribed. r`In' me position of *i 1 approaching movement of the grinding wheel I3 K.

. through .the reverse valve which in turn'supports thel rear end of the feed screw 26', and the piston rod 42 is operatively connected tegmove ythe slide 45. .Y i

A fluid pressure system is provided including la reservoir 53 within the base I0 and a pump 5I which pumps fluid through aY pipe 52 and a pipe 53, through-a reversing valve 54, into the cyiinder 40. A suitable relief valve '55*is provided in the pipe line through a pipe 56 into the reservoir 50.

The reversingvai-le 54, of the balanced piston type, is ,previded with avalve stem'51 which is to be hereinafter dethe valve stern 51 (Fig. l) fluid under pressure is admitted through the reversingvalve 5 4 into a cylinder chamber BUto mov the piston 4I and thev feed4 screw 26 kbodily towardrthe left l(Fig; vl) and cause a rapid controlled #in a manner relative to the Werk piece ,I5-yl The parts illustrated inoiFig. 1 are* showny withthe work and Wheel in grinding` engagement with each other.

During the approaching or infeeding movement,v

uid isy exhausted from avcylinder chamber 6|, 54M! pine Se, into the reservoirtt), l i u When it -is desired to Ycause a Y:rearward feedingV movement of thel grinding YVwheel I3 ,and

the wheel slide VII,.the salve stem 51 is shifted toward the right (Eig. 1) `intoits reverse position so as to cause the. Aiiuid under pressure passing throughw'ithe pipe 53 and valve 54 to Aenter the cylinder chamber 6I yto cause a rearward movement ofv the grinding Wheel .Y I3.

It is desirable to providca suitable mechanism for reducing the y rapid approaching` ,movement of the grinding wheel to a fwhen the grinding wheelfhasbeen brought into ferred construction, a

systemlis provided which, as illusv a dash .pot piston 6,6 arranged in is fed Vtoward engagement with4 the workpiece. In the presecondary self-contained fluid pressure l trated, comprises a dash pot cylinder ,having ment withithe lfeed screw 26,'-andpreerably so constructed and .arranged that they dash `pot piston 66 is slidably mounted on an extended portion ofthe piston rod42 movement is obtained until a sleeve 68, which surrounds the piston K the dash pot piston 66 vand upon further movement serves lto modify the approaching movement of thefgrinding Wheel V,I3 so as to reduce the infeeding movement to a predetermined grinding feed. sleeve relative to the piston rod 42, an internal thread within thev sleeve 68 engages a threaded portion 69 on the piston rod 42 and may be located in an adjusted position byl meansof a lock nut 1I). A spring. 1I within the dash pot piston 66-and`surrounding the pistonrrod 42 serves to return the ldash pot piston to its initiall or rearrward position during the separating rriovement` between the grinding wheel I3 and Work piece I5. During theidle'return movement of the dash pot piston 66, oil is drawn throughy a ball check 53 which is arranged so thatk #excess pressure in the system willby-passfluid Y.with a :projecting hub slow grinding feed .v

-of the hand wheel '29.

axial align- When the wheel f thel work, ra rapid approaching n other end 0f the Sleeve 95- rodl 42, engages 'the Aend of ,To facilitate adjustment of the v valve (not shown) into a dash pot chamber 12 from a self-contained reservoir 13 which is yformed integral with the dash pot cylinder 65, so that the dash pot is then in condition for the Ynext grinding operation, l

The rearward or idle stroke of the dash pot piston |56 under the influence of the spring 10 is limited by a pin 15fwhich is fixed to the dash pot piston 66 vand projecting through the' dash pot cylinder head, and is arranged to engage an adjustable stop 16. Y Y

When. the movement of the piston 4I starts to move the dash potpiston 66 toward the left (Fig. 1T, the oil is forced from the dash pot chamber 12,y througha needle valve 11, a port 18 and back into the reservoir 13. The' forward grinding feed continues until an adjustable stop sleeve en- Agages the end of the dash pot cylinders 65,

' thereby positivelyiilimitingthe approaching movelment between the grinding wheel I3 workpiece I5. o y n Y y i' It is desirable to provide a suitable nian'ual control for the valve 54-by 'which the fluidpressure system may be vreadily controlled so as to either operate independently of Vor inconjunction with the nut and screw mechanism above described, therehyf'providing a' feeding mechanism 4for vino' 'ng av massive ymachine tool slide with the minimum, amount *of exertion on the part of. the operator. The gear 31 is described. A* n K h rlit is desirable Vto 'provide 1 a lsuitable connection'between the manually operable hand wheel 29` and the fluid pressure control valve 54 so that when the hand'wheell29 is 'turned to cause a vfluid pressure feeding ,of the slide, theslide will move either towardfor from the'work piece I5 at a rate determined by the speed of rotation h l I The faster the hand wheel is rotated, thewider openrwill be the con- ]tr'ol valve 5 4. A rotatable sleeve 95 is rotatably 'mounted ony the shaft 33. A collar 96 is fixed to the shaft`33 by means of a tapered pin 91', the collar 96 serving to locate the sieeve 95 on the shaft 33. A similar collar 98 is mounted on the vshaft 33 and is slidabiy keyed thereto by means of a key 99. Thel co'ilar 98 is preferably yi'eldably maintainedin engagement with the In order tohold the collar 98 in engagement with the end of the sleeve 95 with the desired frictional pressure, a

*spring'IOD isjprovided surrounding the shaft 33 and interposed between theA slidably mounted collary 96 and a collary IIJI which Ais held in. a fixed position on theshaft 33 by means of a vtapered pin |62.

'I'he'spring IDU isA of such a size, dimension, and compressionas to provide sufficient frictional drivey between the ends of the sleeve 95 `and the collars y96 and 98, so that during the normal rotationof the'shaft 33, the sleeve 95 rotates therewith. ,n n*

'i'rno sieovess .is provided with helical groove "-I03on its outer peripheral suriace. A Vsleeve v I04surrounds the periphery-,of the sleeve 95 and by the sleeve I 4 engages the so that when theshait 33 and apin IBS carried helical groovev ID3 providedVY andfis Islidably keyed to'the portion 138 of the feed` screw '2g and is arranged so`that it may be 'thrown' integer out Y of engagementwwith the pinion or gear 36 so that n Vthefeed 'screw 26 may be readily disconnected r from 'the hand wheel lirl'case it is desired to .control' the feeding rnevement of the' grinding [wheel bythe efluid pressure mechanism above which is fixed to the base I0.

l fying the movement of the gear ||4, it tends to sleeve 95 are rotated, the helical groove |03 and pin |05 serve to cause an endwise movement of vthe sleeve |04 relative to the sleeve 35.' The sleeve |04 is provided with an elongated slot 34 (Fig. 2) which is operatively connected by means of a pin 85 to the short arm |06 of a bell crank lever |01. 'Ihe bell crank lever |31 is pivotally mounted on a stud |08 carried by a bracket |39 A long arm IIII of the bell crank' |31 is connected by a stud to one end of a rod ||2. The rod |I2 carries a stud ||3 adjacent its opposite end-which rotatably supports a gear II4. The gear I I4 meshes with a rack bar vI I5 which is slidably supported in a portion |I6 of the base I0. The rack bar ||5 is connected to the end of the valve stem 51. A second rack bar ||1 meshes with the upper portion 'of the gear |I4 and is supported by a bracket IIB` which is flxedly mounted Lto the,

studs (not shown) which ride in the groovein the hub 90 of` gear 31. The yoked member |23 has a downwardly projecting arm '|22Ywhich isconnected by a stud |23 with a rod |24. The rod |24 projects from the front of the machine-base and is connected at its outer end by a stud |25 carried by a manually operable control lever I 26 which is pivotally mountedon a stud |21.

The stud |21 is supported by a bracket |23 projecting from the front of the machine base. In the full line position of the parts, as illustrated in Fig. 1 of the drawing, the gear 31 is out of .mesh with the pinion 36. When it is desired to connect the manually operable hand wheel 23 to rotate the feed screw 26, the lever |26 is` shifted into the dotted line position I26a whichv serves through the link |24, the lever |22, 'and' the yoked member |20 to slide the gear 31 Ain an endwise direction' into mesh with the pinion 36.

In the operation of this mechanism, as illus-. o trated in the drawing, when it is desired to cause an infeeding movement of the wheelslide |I and the grinding wheel I3, the manually 'operable feed wheel 29 is rotated in a counterclockwise direction (when facing the front of the machine) which serves to rotate the shaft r rack |I1 and thereby to cause an endwise movel ment of the rack |I5 towards the left (Fig. 1) to move the valve stem 51 in the same direction so that the valve pistons assume the positions as illustrated in Fig. 1, so as to admit fluid under pressure to cause the piston 4| to move toward the left and thereby to produce an infeeding movement of the wheel slide and grinding wheel I3. As soon as the piston 4I and the rack II1 start moving toward the left, thereby modifvwheel 23 iarotated at a uniform rate l`whichservestomovetherackbarlilllahiilyin -vvlmeelaswellastherackhar pistons'aremaintained in the positionof The upper end of the yoked member |20 is provided with opposed pins or r slowdownthemovementoftherackl|3,andto movethevalvestem'llintbeoppoeitedirectim If, however, the manually operable hand feed excess ofthe feeding movement of partsasillmtrated. Thespeedofrotation thehandwheelflllervestogovernthepositionk vmovement of the wheel I3 and work piece I3,

the feed wheel 23 is turned in the opposite direc- `tion which` serves ,through the mechanism above .described to shift the valve stem 31 sons to reverse the position of the valve pistons and admit duid under pressure into the cylinder chamber 3| to cause a rearward movement of the grinding wheel Iland the wheel slide 1f desired, the hydraulic feeding mechanism may be operated in combination with the feed screw mechanism, in which case the operator shifts' the control lever |23 into the dotted line .position |23a to throw the gear 31 into mesh with the pinion 33 so that when the hand feed wheel 23 is rotated to cause an infeeding movement of the grinding wheel, the feed screw 23 will be rotated and at the same time, through `the mechanism amove described, the control valve 34 will also be actuated to admit iiuid under pressure into the cylinder chamber 33 so that the nuid pressure supplements the rotation of .the feed screw in causing an. infeeding movement of the grinding wheel.

It will thus be seen that there has been provided by this `invention apparatus in which the various objects hereinabove set forth together with manyy thoroughly practical advantages are successfully achieved. As many possible embodiments may be made of the above invention .and as many changes might be made in the embodiment above set forth, it is to be underl stood that all matter hereinbefore set forth or .shown in tht accompanying drawing is to be interpreted as illustrative and not in a limiting Sense.

Il claim:-

1. In a grinding machine, a rotatable grinding wheel, a transversely movable slide therefor, a' fluid pressure piston and cylinder operatively connected to move said slide in either direction. a control valve to control the admission and exhaust of fluid to and from said cylinder, means including a pair of opposed racks and a gear therebetween, one of said racks being stationary and the other being connected to actuate said valve, and a manually operable control member movable in opposite directions to control said valve and arranged to move said gear longitudinally between said racks to actuate said valve whereby the control valve is actuated and the position thereof is controlled by the rate of rotation of said control member.

'2. In a grinding machine, a base, a movable slide thereon, a fluid pressure piston and cylinder operatively connected to move said slide in either direction, a control valve to control the flow of iluid under pressure to and from said cylinder,l a rotatable hand wheel, a cam which is arranged to be rotated thereby, a friction device vinterposed between the'hand wheel and cam whereby the cam is frictionally rotated byfthe hand wheel, a rack bar arranged' to actuate said control'valve, a rackrbar opposed thereto and kmovable with said piston, a gear interposed; be-

`"der operatively connected to move said slide in either direction, a control valve to control the flow of fluid under pressure to and. from said cylinder, a control member, a cam which is arranged to be rotated thereby, a friction device interposed between the control member and cam whereby thecam is frictionally rotated by` thecontrol member, a rack bar arranged to actuate said control valve, a rack bar opposed thereto and movable with said piston, a gear interposed between said rack bars, a sleeve slidably'supported on said cam, a follower on said sleeve which engages said cam, and connections including a bell crank lever between said sleeve and gear whereby the valve is actuated by andthe position thereof is 'controlled by the rate of movement of f the control member. Y

4. In a grinding machine, a base, a movable slide thereon, a fluid pressure piston and cylinder operatively connected to move said slide in either direction, a control valve to control the flow of fluid under pressure .to and from said cylinder, a rotatable hand wheel, a shaft rotatably mountedin the base and geared to said f hand wheel, a rotatable sleeve on said shaft, a

camk groove in the periphery of said sleeve, a,

friction device which is arranged normally to rotate said sleeve with said shaft, a second sleeve surrounding the first sleeve, a follower carried by said second sleeve which engages said cam, a bell' crank lever pivotally mounted on said base and having one arm connected to said second sleeve, a rack bar connected to operatey said valve, a rack bar opposed thereto which is moved by and in timed relation with said piston, a gear meshing with said rack bars, and connections between said gear and said bell crank lever whereby the control valve is actuated by and the'position thereof is controlled by the rate of rotation of the hand wheel.

5. In a grinding machine, a base, a rotatable grinding wheel, a transverselyy movable nslide therefor, a nut and screw feed mechanism inter- I posed between the slide and base, a uid presn sure piston and cylinder operatively connected to move said nut and screwv axially in either direction, a control valve to control the admis- 'sion Aand exhaust of fluid to and from the cylinder, a manually operable hand wheel, ashaft rotated thereby, a pinion on the end. of said shaft, `.a gear carried by said feed screw which is arranged to be'meshed with said pinion, and connections between said shaft and said control valve whereby the feedscrew is rotated andthe `valve lis actuated by and the position of the valve 'controlled by thev rate of vrotation of the hand wheel. L

v6. In a grinding machine, a base, a movable slide thereon, a nut and feed screw mechanism to move said slide in either direction, a fluid pressure piston and cylinder operatively connected to move said screw axially in either direction, a control valve to control the flow of fluid under pressure to and from said cylinder, a rotatable hand wheel, a shaft rotated thereby, a pinion formed on the inner end of said shaft, a gear slidably mounted on the end of said feed xscrew,v a manually operable lever arranged to throw said gear into or vout of mesh with said pinion so yas to connect or disconnect the hand l wheel with the feed screw, a rotatable cam carried by said shaft, al friction vdevice carried by the shaft and arranged to rotate said cam, and rack and gear connections interposed between said cam and Valvewhereby the control valve is actuated by and the position thereof is `controllecl by the rotation of the hand wheel.

7. In a grinding machine, a base, a movable slide thereon, a nut and screw mechanism to move said slide in either direction, a fluid pressure piston and cylinder operatively connected to move said slide in either direction, a control valve to control the flow of uid under pressure to and from said cylinder, a rotatable hand wheel, a shaft rotated thereby, a gear connection between said shaft and feed screw whereby the rotation of said wheel serves to rotate said feed screw to cause a movement of said slide, `means including a manually operable lever to `connect or disconnect said gearing, a cam rotatably mounted on said shaft, a friction device arranged to hold said cam normally to rotate with said shaft,.and rack and gear connections between said cam and said valve whereby rotation of said shaft serves to rotate said feed screw and to actuate said control valve so as to admit fluid under pressure to said cylinder and thereby modify the feeding movement of said slide produced by rotation of the nut and feed screw mechanism.

Y AWALLACE H. WOOD.

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