US1516103A - Grinding machine - Google Patents

Description

NovQig i924;-

3,516,103 J, KELLER GRINDING MACHINE Filed Sept. 2, 1922 4 Sheets-Sheet l Nav, 18, w24. 1,516,103

J. KELLER GRINDING MACHINE Filed Septf? 1922 Sheets-Sheet 2 .L if L www3 Nov; 18, 1924 J. KELLER GRNDING MACHINE Filed sept. 1922 -4 sheets-sheet 4 atented Non. l, i924.

U hi l T m JEREMIAH KELLER, 0F CANTGN.

HIY. ASSEGNOR TO THE TIMKEN ROLLER BEARING- COTJIFANY, OF CANTON, OHIO, A CGRPORATION OF OHIG.

GRINDING .TYACHINE Application filed September To all whom z' may concern Be it known `that. l, .lnnnnxan Kama-1n, a citizen of the. United States, and a resident of the city of Canton,A county ot' Stark and State ot' Ohio, have invented a new and useful Improvement in Grinding Machines. of Which the following is a specification.

My invention relates to grinding machines and particularly to machines for grinding the ends or rolls, for roller hearings. The principal object of the invention. is to provide for automatically grinding the ond edges of rolls for roller bearings.

The invention consists principallfv in mounting the oscillatahly grinding wheel in automatic means for feeding the rolls into position to be ground, in means for c iccting the finished rolls, and in nieans for feeding the grinding Wheel to compensate :lor wear. The invention further .consists in the parts and combinations and arrangements ot' parts hereinafter described and claimed. ln the drawings which form part of this specification and wherein like characters indicate .like parts Wherever they occur:

Fig. l is an elevation ot' a grinding machine embodying my invention;

Fig. 2 is a top plan 'View thereof, the support; for the roll hopper being broken 0 away and certain parte being shown in section;

Fig. 3 is a vertical sectional View' thereof;

Figs. l and 5 are sectional views along the lines 4-4 and 55 respectively in Fig. 3;

lfig. 6 is a fragmentary end view nidicated by the line 6-G in Fig. 3;

Fig 7 is a sectional view along the line 7 7 in Fig. 6;

Fig. 8 is a horizontal sectional View along the line 8 8 .in Fig. ii

Fig.' 9 is a sectional View along the line -9 in Fig. 2;

Fig. lO is a sectional View along the line 10-10 in Fig. 2;

Fig. 11 is an elevation of the pawl and ratchet by which feeding oi' the emery wheel is accomplished, and of the cme wheel hanger; l Fig. l2 is a sectional View along the line 12-12 in Fig. 8;

'Fig'. 133 is a horizontal sectional View of the emery wheel supporting bracket showing the means for feeding the emery Wheel forward;

2, 192k. Serial No. 585,932.

Fig. a .diagrammatic View showing the electric circuit. governing the einery Wheel feeding means; and

Fig. 15 is a fragmentary sectional view on a larger scale of a roll carrying member.

@n a suitable hase l is mounted a housing 2 containing the mechanism for operating the rotary indexing head 3 that contains the rolls 4, and tor rotating a roll 4 lacing ground. li'iounted on the top of said lionsing Q is a pedestal 5 `aving an enlarged head o on which mounted a hopper i or container that holds a supplyv oi rolls to he ground. Also mounted on the housing 2 is a bracket 8 that supports the mechanism for supporting and operating an emery wheel 9 that is disposed alongside of the housing in position to grind the beveled end ot a roller J.- hcld in the indexing head 3 and proj ecting from the housing. Rotatably mount ed in the housing 2 is a main driving shaft l0. on Whose projecting end is mounted a. pulley wheel l1 or the like that may be driven .from any suitable source of power.

The bottom of the hopper has a tubular extension 12 that makes a snug lit with the head il oi the pedestal whereby the hopper is secureljv mounted on the peoestal. A shaft i3 rotatably :mounted in said pedestal 5 and a liber disk H- or the like is secured thereto. Resting on said fiber disk and mounted on thc shaft. is -a conical disk l5 whose beveled edge is adapted to cooperate with rollers in the. hopper. Secured on the rertical sha ft E3 above said tapered disk 15 is a second iher disk '16 that is pressed against said tapered diskA hy a spring 17 secured to the shattby means of nuts 18 and bearing on said friction disk. The upper end of the shaft. 13 projects above the top of the hopper and is .provided with a handle/ll) for turning it. Preferably a metal, ring ,2U having e beveled inner edge is mounted in the top of the head 6 of the pedestal and said pedestal is provided with a tapered groove 2l below Said ring, a clumnel thus being formed that is adapted to receive conical rolls with their smaller ends 5' down. rlhe rolls in said channel are 'moved along in the channel by the trictional con- .taet of thetapered dish 15.

Said disk 15 is rotated oy said shaft 13, as above pointed out. In case of a jam, the

frictionalmounting of the tapered disk 15 will permit it to slip on the shaft, thus avoiding damage to the machine.

The shaft 13 is provided with a gear 22 at its lower end, said gear 22 meshing with a gear 23 mounted on a suitable shaft 24 on top-of the housing. Mounted on said shaft above said gear 23 and secured thereto is a ratchet gear 25 that is rotated by a pawl 26 that is pivotally secured to the end of a'vertical shaft 27 mounted in a suitable bearing member 28 in said housing. A spring 29 is secured to the end of the pawl 26 and to the shaft. This spring 29 holds the pawl 26 against the ratchet gear 25 and onV the back strokeof the pawlf 26, the ratchet gear 25 is rotated backward a short distance by said pawl 26 riding lover it. This barkward rotation of the ratchet wheel 25 is limited by a second pawl 30 whose end is secured to the shaft 24 by a spring 31. This slight backward movement prevents jamming of the rolls in the hopper channel.l

Said shaft 27 is provided with a bevel gear 32 at its lower end that meshes with a bevel gear 33 on the main driving shaft 10 of thel machine.

. At one point, an opening 34 `is provided in the bottom of the channel in. the pedestal head 6. A. tube 35 is secur d tothe pedestal, opening 'into said vchan el opening',l the lower end of the tube being secured to the top of the housing 2 and opening into it. Slidably mounted on a suitable member 36 secured to the housing is a plunger 37 to which is secureda portion 33 having a hole 39 therethrough adapted to receive a roll 4 from the tube 35 and deliver ittoa passageway 4() in said plu ger-supporting member 36. Said member @E is provided with a vertical slot 41 opening into said passageway. The passageway curves from the vertical to the horizontal, so as to deliver a roll into the .opening in a spindle 42 of the 1ndexing head 3. Al spring 43 issecured to the housing,l as byscrews 44 and projects into the horizontal portion of .said passageway 40 tobear against a. roll therein.

'Secured to the end of the roll "receiving portion 38 of the plunger 37 is 'a projecting lug 45 that -is provided with ra'slot in which is mounted a depending finger 46. The shank portion" of the fi ger 46'is secured in said slot by meansof asuitable screw 47. The linger 46 isin alinement with the slot 41 in the roll receivingmember 36 and when the plunger 37 moves to receive another roll from the ltube saidfingerextends into said slot and presses a roll from the passageway into the hole inthe spindle of the indexing head. :Secured to the projecting member 45 of the plunger 37 is .an arm 48 in which. is

lmounted a .s'rew 4 9 Whose end abuts against may be turned to adjust the stroke of the plunger, if required.

Indexing head.

The circular indexing head 3 is mounted on a,suitable shaft 50 and is provided with four hollow spindles 42 in each of which is mounted a hollow piston 51, the outer end of whose bore 52 is conical to receive a conical roll 4 from the roll passageway 40. lhe end of each piston is provided with an annular slot 51EL in which is mounted a sleeve 5l" that has an outwardly extending and rebent flange 52c at the end, this arrangement preventing dust from entering between the spindle 'and piston. Mounted in grooves on each of said pistons 51 is a plurality of split rings 53 or bushings that are preferably ot' bronze and that tend to prevent the piston 51 from turning in the spindle 42. Preferably two rings 53 are mounted in each groove, the combined width of the rings be-A 53b that i's fixed in the piston 51. Any ro.

tary movement of the piston tends to spread the rings 53 so that the piston is frictionally held in its spindle. Mounted vin the bore of each piston 51 is a plunger 54 that has an enlarged portion 55 that tits in the bore of the piston 5l and that has a reduced portion 56 projecting beyond the inner face of the indexing head 3. The plunger' 54 is adapted to force a finished roll out of the piston, as will be described later. At the same time the enlarged portion 55 of the plunger 54 forces the piston 51 outwardly in the spindle 42. On the rollfeeding stroke ot' the roll feeding plunger 37, the piston is forced inward the distance lixed by the limit screw 49.

Mounted on the vertical shaft 27 in the housing above the bevel gear 32 is a cam 57 in which rides a cam roller 58. Said cam roller 58 is secured lto an arm 59 that 'is mounted on a hollow cylinder 6() that is sleeved on a suitable rod 61 vin the' housing 2. Secured to the top of said hollow c 'linder 6() is an arm 62 Whose end has a projection 63 that. extends into an opening in the end ot`the roll feeding plunger 37. the other end of the cylinder is an arm 64 whose end is in alinement with the extension 56 of the plunger'54 in one of the pistons. Thus, therocking of the cam arm 59 moves both of the arms 62, 64 back and forth, to movethe roll feeding plunger 37 Secured to-v and also to move the-roll ejecting plunger i on the shaft 50 that supports the with radial slots 66 at angles of ninety degrees. The portions 67 ofthe star wheel between the slots 66 are arcuately curved.

Mounted on the main. driving shaft 10 is a disk v68er master wheel that is provided with a pin 69 that is adapted to extend into a slot 660i the star wheel and rotate the star wheel through an angle ot ninety degrees. The master wheel 68 is provided with an arcuate flange 70 t-hatengages a curved portion 67 of the star wheel to prevent rotation thereof.

Mounted Ain the upper part of the housing 2 is a pulley .71 and adjustably mounted in the vlower part of the housing, as by means of a screwl 72 extending through a slotted member 78 secured .in the housing, is a second pulley 7 4 that cooperates with said first mentioned pulley. Mounted on said pulleys 71 and 74 is a belt 75 that is adapted to contact with the projecting end of a hollow spindle 42, to drive'the same while the roll therein is being operated onby the emery wheel 9. The upper pulley T1 is mounted on a horizontal shaft 76 that is driven through a suitable train of gears 77 by a gear 7 8 that is mounted on the main driving shaft 10 of the machine.

Emery wheel supforting and draf-ving mec amsm.

Pivotally mounted on a stud 79 on top ol the housing 2 is the bracket 8. The bracket 8 is held in the desired position as by means of a screw 80 secured to the housing and fitting in an arcuate slot 81 in the bracket. Mounted in suitable bearings 82 on the bracket 8 is a hollow shaft 83 on which is mounted a hanger 84 or reciprocating frame. The shaft is held against endwise movement as by means of a collar 85 that abuts against a bearing.

Mounted in the hollow shaft 83 is a feed screw 86 that is provided with a ratchet wheel 87 at the end that projects out of the hollow shaft 83. Mounted on the feed screw 86 loosely enough to be able to rotate relative thereto, is a collar 88 that overlaps the end of the hollow shaft 83 and is securedv thereto as by screws 89. The threaded end ot' the feed screw 86 tsin a threaded'hole in a member 90 that is secured to the hanger 84 and that projects into the hollow shaft 83 through a slot 91 therein. Thus, by turning the feed screw 86, the hanger 84 may be caused to move along the hollow shaft 83.

Mounted on a rotatably mounted shaft 92 disposed longitudinally in the lower end ot the hanger 84 is the emery wheel 9. A multiple rope pulley 98 is fixed on said shaft 92 at about the middle thereof. A shaft 94. rotatably mounted near the top of the hanger has a pulley 95 that cooperates with the pulley 93 on the emery wheel shaft 92 and Ais also provided with a pulley 96 that may be driven from any suitable source ot' power. Said shafts 92, 94 are preferably mounted in split bushings 97. A Dhollow may be adjusted. The rod 99 maybe secured in the desired position by a set screw 102.

Emery wheel rocking mechanism.

A suitable vgear 103 is formed on the end of thc main driving shaft 10 and cooperates with a larger gear 101` on a horizontally disposed counter shaft 105 that is rotatably mounted in the housing 2 parallel with the main driving shaft. A second gear 10G on said counter shaft 105 cooperates with a gear 107 on a stub shalt 108 in alinen'ient with the main driving shaft .10. shaft. 108 is driven in the same direction as the main driving shaft but at a reduced speed. Said stub shat't 108 has a portion projecting from the housing and an eccentric 109 is secured thereto. A' rod 110 extends upwardly from said eccentric and is threaded into a second rod 111 that is Secured at its upper end to a projecting portion ot the hanger 84, by means ot a bolt 112 itting iu a slot 113 in said hanger. Thus, as the main shat'l 10 rotates.v the eccentric 109 is rotated. "l'his causes an up and down niovement of the rods 110, 1.11 which, in turn, causes a back and forth rocking movement of the hanger 81 that supports the emery wheel 9. On each stroke of the hanger the cniery wheel 9 passes a roll. 4; and grinds the beveled edge thereof.

h'lounted to cooperate with the ratchet wheel 8T, as by a pivot piu 114 secured to a member 115 projecting upwardly from one of the hollow shall beariiigs is a pawl 116. The pawl 116 has an elongated arm 11T extending along the ratchet wheel 87. The weight ot said arm tends to keep the pawl 116 out ot' engagement with thc ratchet wheel 8T. Mounted on the housing 2 is an electro-magnet 118 adapted to attract the treo end 11'; ol the. pawl 116 to torce the other end thereof into engagement with a notch ot' the ratchet wheel 8l'. lvlhen said pawl 116 is in engagement with the ratchet: wheel 8T, the wheel 87 and screw 86 are prevented from rocking in one direction. Thus, when the hanger 8#1 rocks in that direction, it is fed along the hollow' shaft 83, since said screw 80 is held stationary and the hollow shaft is held against endwise movej nient.

An arm 119 that is secured to the hollow shaft 83 (preferably near one of the bearings 82) is provided with a Contact screw 120 at its end. Secured to the bearing eas- Thus said ing is a support 121 to which is secured an insulated `yoke 122 with its arms depending. Secured to one of said arms is an electrical switch member 123 whose free end is disposed above the Contact screw 120 of the rocker arm 119 .Secured to the other-arm of the yoke 122 is va switch member 124: whose free end is above the freeend ot the first switch member 123. These switch members 123, 124 or contacts are bioiiglit together at the end of the clockwise rocking of the hollow shaft as shown in Fig. 1U. One of said switch members is electrically connected with a source ot electricity 125 which, in turn, is connected with the electromagnet 118 and the other switch member is connected with a switch -member 126 that is disposed near the roll being ground. Said switch member 126 is vmounted in a suitable casing 127 that is secured to the housing 2. Rotatablv mounted in said casing 127 is a disk 128 that is adapted to bear against the beveled edge of a roll 4 being ground. Said gaging disk 128 is pivotally mounted on a lever 129, the end ot' which is adapted to bear against. said switch member 126 and make it contact wit other switch member 130 in said casing, which switch member 130 is electrically counected with theelectro-magnet 118. 'lhe gaging disk 128 is so adjusted that when it bears against a roll whose end is not ground off enough, the switch members 126, 180 will be pressed together whereas, when the r'oll is sufficiently ground off the switch members will remain separated. .It

`v .will thus be seen that for a circuit-to be closed through the electro-magnet thus at-v tracting 'the end of the pawl and causing feeding' of the emery Wheel supporting ghangcr, `it is necessary that both sets ot .switch members be closed. An adjusting .screw lOigis mounted in said housing with its end engaging the switch member 130; so that the position of said switch member may be adjusted. 1 I

At' the end of the clockwise rocking moyeinent of the hollow shaft 83, the switch members 123, 124 governed thereby are forced together; and if, at that time, the roll that has just been ground `is notsutlieiently ground, the switch members 126, 130

j governed by said roll will also be i-n contact, thus closing a circuit through the electro- 4magnet 118, attracting the end of the pawl 116, preventingrotation thereof and of the feed screw 86 and causing the hanger 84'to be fed along the shaft. be repeated each time thatan insufficiently ground roller is in contact with the gaging disk 128 when the arm of the hollow shaft forces its switch members 1231., 124 together. When asudiciently ground roller is in contact with the gaging disk 128, noicircuit is closed through the electro-magnet even ii the.

`tion shown. This feeding will hopp and the power for driving the maL 7 chine isctiirned on; In order to start the operation ot' the machine. the handle 19 'is preferabl)y turned by hand thus filling the channel with rolls and jteeding a rollinto the tube 83. The operation of the plunger ,75

3T forces a roll into the roll receiving member 38 and thence into the piston ofa' spini die I2 of the indexing head. The piston:A is forced into the spindles() that the roll projects the proper distance'from the spin- 80 dlc. The rotation of the indexing hea-d brings a roll in position to be operated on hv the einerv wheel 9 and t-lie oscillation ofy the eiiier \v 'heel hanger Jforces the emeryfjA wheel across the bevelededge of the roll, `grinding ofi' said edge.

Il: the parts are'l properly adjusted. the roll' will be sind, cientl'yv ground and. as above described, no circuit will be closed through the electro-...

magnet L18. and the feed screw 86 will con- 90 tiiiie to rock with the hanger 81 and: shaft. 'l`lit` indexing head will then be turned by the operation of the star wl1eel,'aiid the ground roll will be in a lowermt'ist position,

wlicic` on the stroke ot' the lower arm oper- 95 ated by the cani. the piston pliingerfl willi be caused to eject said'ro1l. In the fourth position of vthe indexing head, the spindle is empt)7 and no work isdone. On each stroke of the einery wheel, it grinds the edge of a roll. y n] i I The operation of the machi e cpntiii-ues until the emery wheel is worn d wn so/that/I it does not grind off a sufficient amountot the roll; and then'ythe yelectric eircuitabove 1105 described will be 4closed to feedthe emery wheel nearer to the work. c j f Atteinthe emery wheel is completelyworn down, and is replaced witlra new one, the

ratchet wheel is vturned back byrh'and. to'll putthe eincry wheel in proper position. y

The machine above described has nu!11f?,r.-l

ous advantages. It 'provides automatic `and. i,

accuratemeans Yfor positioningy the rollsltoV the ground and for. operatingt` theucmeify 1,15*

wheel. The operation of the lmachine is en v tirely automatic and it takes care of the@` wear ofthe emery wheeL `bvroiisly,,m1-

me-rous 'changes .mayl be ma( e without dc- 1,

parting vtrom my invention ani-ll do ntzfl wish to be limitedto the precise constiic,

what I nim is.: j

1. A grinding machine comprising?a'I rbll'il carrier, a rotatable grinding wheeldisposed il obliquely with relation tothe axis of carrier in `position .to bevel the end. edge Aef a j roll in said carrier, means for oscillating said' grinding wheel and means for bringing :a new roll into position to be beveledafterf-W monos the grinding wh'eei has passed a roii, Whereby the end of u roii is beveled on each swing ing movement of the grinding wheei.

2. A grinding machine comprising a pivotaliy mounted arm, a grinding wheeil rotaiably mounted at the end of said arm and for roi/ting said grinding wheeh means for oscillating' Suid arm, :1nd a roi] support rotatabiy mounted in such position that the end edge of :i` roii thereinwvli he in the path Of'osciliation of said grii'xding wheei, Suid grinding Wheel being disposed obiiqueiy with reiaion to tho axis of the roll.

,3. A grinding machine comprising e grinding w ieei und means `for rotating ,and

osoiiiating Ashe suino and :i roll support. hur- -position io be ground by Suid grrinfiinf ing e plurality of chucks euch adapted 'io Contain ay roii ro be ground, Suid roii support being rotatably monnied in such position that the end edge of a roii in one of Suid chucks will lie in the path of oscillation of said grinding Wheel, and Ineens for rotating Said roii support to bring a new roi! intro position to be ground after euch osriihition of the grinding wheel.

4. A grinding' nizrrhine Conni-rising :i grinding Wheeiand means 'for rotating :uni Oscillating the Sarno, roii suppor rotatably mounted in Such position 'that -he end edge of a roll therein Wiii iie in the mth of osciiiation of seid grinding u'heeii, :1nd means governed by a roii being ground for feeding salid grindinlgw wheei town 'de he roi supp'or.

5. A grinding machine comprisin :rfi per, a grinding' Wheei,V a rotzieoie' in adapted and arranged to ceri-y 'ro is. imo

Wheel, means for feeding' rolls iron; sein hoppor to said hearh Suid menne con'iprising a channel of conical section in the, hot-toni of Said hopper, nu openiifigfy in tho hotoin of said channel` ineuns for foedinrgy roiis along Said ohzinnohto Suid opening, u piungor hilving an opening herothrough, u iuhr icedin from said openingF in seid rhunnei, und plunger being ino'vuhie to bring' the noie therein into alinemri'itf/with /the ond :haiti tubo to receive o roil therefrom, :i nienihri' having i passageway therethrough udnprd t0 receive-a roii from said plunger, nuuns for transferring u roii 'from enitposean way to said roiinbir houd, suenos i'or .rotating Suid hond et intervnis, und inviano t'or ejeciing finished roiis therefrom.

6. grinding' muriiuo comprising' u hop por, u. grinding wheel, u rotutubie houd `adapted und arranged to rurrjr roiin` into io- Sition to bo ground by .Suid L'i'iidinrr wheoi, means for i'eot'hngr rolle from suiiubopper io `Said heed, Suid ineainr; comprising vfehnunei of Conicai section in. ihr, bottom of said hop per, en oponinlg in Lne boioiu of Suid rhonnei moans; for i'oriiiino; roiis along Suid chen-- nel ro seid opt ugr, :i ptunger having :in

opening therethrough, u tube lending from said opening in Suid rhenneh'nnd Suid plunger being movable to bring the hole therein. into aiinenient with the Iend of Suid tube to receive a roii therefrom, a member having: n, pes'sagewoy thoreinrough adapted to rereive a roii from said piunger, said member hziving slot opening ino Said 'pzissugeivuig Ineens for transferring a roii from said im Sogeu'uy -to said rotatable heed, Suid ineens comprising' :i finger Carried by said plunger and adapted to extend. ino seid slot to uhu'. uguins :i roii in Suid puseugg'ewuyf menus for rotating Suid heed inevuis und .ineens for iniehod roiio therefrom.

'i'. A grindingA machine coniprieing u bopper, n grinding ivi'ieei, :i rotutiiiile hrud adapted and arranged ro Curry rolis. into pf siion to he l iground by amid grinding wheeh means for feeding roiis `from Suid. hopper to Seid her-id. Suid menne (.-tungn'ising a channel of conical section in the hotiom of Suid hopper, un opening in the bottoni of Suid chunnei, nie-uns for feeding' roiis along' Suid #hunnei to Suid opening. Suid invano iurhxdiir;l :i rouzibio ronirui disk udiipird to heur against the Sitios of rolls in Suid rimuovi. :i plunger haring un' opening therethrough. u tubo leading from Suid opuninrv in huid thun-- noi, und said i v:niger beiuh" morzibio to bring the hole therein into ntineuient wih the end of Suid iube to roreire u roii their in, nirznber having :i puseugowuv thorernrough adapted to receive u roli from Suid piungor, Saud member having :L Shit; open-- ing into Suid passageway, menus for tranl` foi-ring; o. roii from huid l'nissugewuy to .Quid rotziebie hoed, Suid ineens comprising :i iingerozirried by Suid piungor und adopted io eiiend into Suid Slot to abut, against n roi! in said passageway, ineens for rotziiiiu,r Suid head ui intervals und incarne Yfor @jerking finished roiis therefrom.

tr. grrrinding nuirhinr comprising :t huir gior. i grinding whorh u rotuiuiih houd. hoh iow :spindirs in Suid houd urluiittd und ur-v rnngoti to mirri roiis into position io ho ground by said riniiin; rfhrr-i, snrnns for fredingj roiis from Huid hoi'iptr io Suid spindie, Suid moans comprising' u rhunuei oil conirui srrfion in the boiioui of Suid hopper, :in opening' iu the, bottoni oi' Suid rhzmnr-i, moons for feeding roiis uiting Huid rhziuntei. to Suid oprningj, u Hunger burin;r on ope ing Hiorriu'tuigh, u fuhr. iruding from Suid opening in Huid rhuunoi, und amid piungijvr bringniovublo io bring ine hoie ihcrein ino niintniont with ihr und of said iubo io roreire u roi! therefrom u member huring u ptisifi'ug'euf'ny ihereihrmiggh adopted o rrrrifo u roii from sind phon sind member hu"- ing n eiot opening y said pussiufenvg-y, ne for 'tioneferrig u roii from uuid puoi in said hanger, a member secured to said hanger and extending into`a slot in vsaidv shaft and provided with a threaded opening, a screw threaded rod disposed axially of said hollow shaft and extending into the threaded opening in said member secured to said hanger, means for ,oscillating said hanger and means for preventing rotation of said screw, whereby when said screw is free to rotate, it rotates as a unit with said hanger and hollow shaft and when said screw is held against rotation said hanger moves longitudinally'of said shaft.

10. A grinding'machine comprising a hollow shaft rotatably mounted, a hanger mounted thereon, a o'rinding wheel mounted in said hanger, a member secured to said hanger and extending intoa slot in said shaft and provided with a threaded opening, a screw threaded rod disposed axially -of Vsaid lio-llow shaft and extending into the threaded opening in said member secured to said hanger, means for oscillating said hanger. and means for preventing rotation of said screw, said means comprisinga ratchet secured to the end thereof and a pawl adapted and arranged to cooperate with said atchet whereby when said screw is free to rotate, it rotates as a unit with said hanger and shaft and when said screw is held against rotation, said hanger moves longitudinally of the shaft.

ll. A grinding machine comprising a hollow shaft, a hanger mounted on said hollow shaft, agi'inding wheel mounted on said hanger, a meinbei secured to said hanger and extending into al slot in said ,fliollow shaft and provided with a threaded opening, a screw threaded rod disposedvaxially of said hollow shaft andgextending into the thread- 'ed opening in said member secured to said hanger, a ratchet secured to the end of said threaded rod, apawl mounted to cooperate with said ratchet tohold said threaded rod and screw `against rotation, means for oscillating said hanger, a roll support rotatably v mounted in position to hold a` roll in the path of oscillation ofv the grinding wheel and meanscontrolled by a roll and said holder 4for moving said pawl into engagement with the ratchet, said means lcomprising lan elec'- tro-magnet adapted and arranged to attract one end of said pawl to force the other end thereof into engagement with a notch of said `atchet, a switch adapted to close an electric circuit through said electro-magnet and a gaging member for controlling said disk, said gaging member being in contact with a roll, whereby when a roll' is insutli'- ciently ground a current is closed through said electro-magnet, rotation of said screw is prevented and the hanger is moved along said hollow shaft.

l2. A' grinding machine comprising a hollow shaft, a hanger mounted on said hollow shaft,`a grinding wheel mounted on said hanger, a member secured to said hanger and extending into va slot in said hollow shaft and provided with a threaded opening, a screw threaded rod disposed axially of said hollow shaft and extending into the threaded opening in said member secured to said hanger, a ratchet secured to the end of said threaded rod, a pawl mounted to cooperate with said ratchet to hold said threaded rod against rotation, -means for oscillating said hanger, a roll support rotatably mounted in position to hold a roll in the path of oscillation of the ind- 90 ing wheel and means controlledby a roll in said holder for moving said pawl into engagement with the ratchet, said means comprising an electro-magnet adapted to'attract one end of said pawl to force the other end thereof into engagement with a notch of said ratchet, a switch, a source of electricity connected Vwith said electro-magnet and one member of said switch, a second switch having its members connected respectively with the electro-magnet and ,said first mentioned switch, a/member secured to said hollow shaft and adapted to close said first switch at the end of the rocking movement of said shaft and a gaging disk in con- 10e tact with a roll and'ada'pte'd to close said i A`comprising a plurality of hollow spindles,.a

'hollow piston in each of said spindles, the

end of the bore of each piston being adapted to receive an article, said pistons having frictional engagement wit` said spindles, 'whereby movement ol: each piston relative 125 to its spindle is possible and means for preventing dust or other foreign material from entering said pistons. ,v i i 15. In a machine ofthe lkind set forth, a rotatable headadantml t0 Support conical 130 rolls, comprising' a plurality ol hollow spindles rotatably mountedA` :i hollow piston in each spindle, the end portion of the bore ot` each piston being conical to receive :i eonical roll, each piston fitting` tightly in its spindle and being provided with grooves, and split friction rings mounted in Suid grooves, whereby each piston rotates with its spindle and is Capable of endwise movement therein.

16. In a machine of the kind Set Jforth. :1 rotatable head :idzipted to support eonleul rolls` Comprising :l plurulit)v ol` hollow spin elles rotatnblvY mounted. u hollow piston iu euch spindle, the end portion ot' the bore of ezieh pistou bein;Y conical to receive :i eouirzil roll, xiu'h pistou litting' tightly in ils spindle und being provided with grooves, two split trietion rings mounted in each of Suid grooves.y the meeting corners of Said rings being` beveled und pins secured to the pistons :ind cooperatingwith the beveled edges o't` the rings to cause them to enguge the Spindh; wher-eb)v @zieh piston rotates with its IQpindle and is capable of endwise movement therein.

Signed :it (Hinton, Ohio. this 29th (lily of ugusl', 1922.

Certificate of Correction.

It is hereby certified that in Letters Patent No. 1,516,103, granted November 18, 1924, upon the application of Jeremiah Keller, of Canton, Ohio, for an improvement in Grinding Machines, an error appears in the printed specification requiring correction as follows: Page 5, line 6, claim 2, for the word and read means; and that the said Letters Patent should be read With this correction therein that the saine may conform to the record of the case in the Patent Oiice.

Signed and sealed this 23d day of December, A. D. 199A.

[SEAL] KARL FEN N IN G,

Acting Commissioner. of Patents.

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