USRE16260E - Grinding- machijts - Google Patents

Description

Feb. 9 1926 w. F. FRASER GRINDl HG MACHINE Original Filed March 28, 1921 5 Sheets-Sheet l INVENTOR @ATTORNEY Feb. 9 192s.- e, 16,260

- W. F. FRASER GRINDING MACHINE Original Filed March 28, 1921 5 Sheets-Sheet a 1- ATTORNEY Feb. 9 1926.

w. F. FRASER GRINDING MACHINE Original l March 28, 5 Sheets-Sheet; 4

' INVENTOR M Q3, flaw @[ATTORNEY Reissued Feb. 9, 1926. I

Re. lilill w BEEN F. finesse, or wEs'rBono, mnssaorrusnr'rs.

GRINDING MACHINE.

' Oligillfll No. 1,470,655, dated. C ctober is,

' reissue filed August 4,

To all whom 2'! may emmorn:

Be it known that I, \VAsnsN F. Presses, :1 citizen of the United States, residing at \Vestboro, in the county of "Worcester and State ofjlassachusetts, have invented a new and useful Grinding Machine, of whichthe following is a specification.

This invention relates to improvements in 'grimlingl machines.

The object ofthe invention is to provide a machine which will automatically feed blanks into a grinding machine and accurately position, holtl and grind said blanks to the desired shape and dimensions of the finished article and then automatical- 1y erect the fimshed article rem the machine.

In the machine of this invention the blanks to be ground are placed in a tube or magazine which is then positioned upon the machine and the blanks a re taken one at a time and carried forward between the centers of a heatl and tail-stock. The blank so carried is then pushed'by the taiLstoek center into a chuck or other suitable positioning or holding device on the head'stocl'. A rotary motion is imparted to the chuck and the blank held thereby anclxthe grinding wheel is then brought? forwzrrrl quickly to engage the blank.' The grinling wheel has a. rotary motion imparted "to it and also a reciprocatory movement laterally thereof as well as a reciprocatory movement toward and away from the article to be ground. After the grinding wheel engages the blank, it is tell slowly into the work of the work is stopped, the grip of the chuck: upon the article is released. and the tail ing the finished" article so that it drops out of the machineinto a conveniently located reeeptacle,.he-;;

until it arrives at the limit of its forward feeding movement,- whereupon it isaccnrntely positioned by a stopmmd while so positioned, the rotation of the grinder and of the article being ground continues as well as the. lateral reclprocatory movement of the grinding wheel until. ell backlosh or play has been taken up and thearticle has been ground. to a line linisl niii'l aecor-.itely dimensioned} whereupon the grimling; wheel retreats quickly. The rotation stock is lbaokerl oli' rel-i 1323, Serial No. 456,411, filed march 2S, 3321. implies pointed. out in the claims.

nism

1925. Serial No. 48,131.

neath the same. Another blank is fed into the machineantl the operatizn inbetore set forth is repeated it understood that all of the tlifierent t tions hereinhefore set forth are ant. in their action. The machine is also videtl with the nsual'tleviees water upon the work during thereof to keep it cool.

The invention consists in the instr' talities whereby the operations herein set forth and others more particular ferred to hereinafter are sceompl partieolarly the. invention eonsis combination and arrangement of forth in the follow specification amt Referring to the (li'Z-FLW Figure 1 is a front elevation o :1: proved grinding machine broken the right thereof to save space in t 1. x ings; I

- Fig. 2 is a. sectional elevation he line 2-42, Fig. 1, looking left in said Fig. "i; 3 is a plan "partly shown in an. of the headstock and connecting Fig. at is a sectional elevation. to the line Fig. 3', v

Fig. 5 is a. detail, sectional e the chuck showing a blank tion with thefeed lingers n 1 lines ilr'connection thcrei .1 out; tail-stock spindle engaging one end blank;

Fig. 6 is an enlarge-ii sectional taken on the line 6-4,, Fig l Fig. 7 is a plan of the tiiil-.. necting n'ieehanisni; I

Fig. 8 is a sectional elevation the line 8$3, Fi 7, I

Fig 9 is an end elevation of tonism illustrator. in Fig. 7 as rieww. the right of Fig. 'i'; s

Fig. 10 is it Planet til e mechanism Fig. 11 is a seoti the line 11-?11, it). grinding wheel and the it is rotated. and. rccipzxeatcri lo o t ;and

rin ding;

12 is detail view of the blank feedv ing arm and fingers.

-erts throughswings.

Like numerals refer to llkr out the several views of the Main defining meckor am,

the drewin s, is the nitllll driving "ft of the machine journallc-l in suitable on a frame 11 and driven by a pulley .22. A cone pulley 13 is fast to the shaft 10 and is connected by a belt 14 to another cone pulley 15 which is loosely mounted to rotate upon a countershaft 16 journoiled in bracket 17 fast to said frame 11. On the outer end of the shaft 16 is fastened a brake ouile Y 18 which i is oni X gaged by a brake 19 operated by a lever 20 and pivoted at 21 to the bracket l7. The bralze lever 2i} is connected by a link to an arm 23 fast to a rock shaft 24 to which rock shaft is also fastened a bifui outed lever 25wl'1ich engages a slidalble clutch member 28 in the usual Well known manner; The shaft is rocked by a bond lever to throw the clutch member 26 into and out of engagement with the clutch fingers :8 which operate to lock the cone policy 14 to the countersliaft 16.

Hemlwtook chuck operating mechanism The cone pulley 15 carries a pulley 15 which is connected by a belt 29 to a drum pulley 39, Figs. 1 and 3, which is mounted to rotate upon the shaftlll which, in turn, is rotatably mounted in bearings on the headstock frame 32, the head-stock frame being minimized adjustable in the usual manner upon a.- bed 33 on the frame 11. The drum 30 is provided at one end thereof with a, conical recess Sat-adapted to receive a conicel clutch member which is splined to upon the shaft 31 and said clutch member is moved into engagement with the drum 30 by a spring; 36 encircling the shaft 31 and hearing at one end against the clutch member 35 end at the other end against a collar 3? which is rigidly secured to the shaft 31, and when the clutch member 35 is film ed or withdrawn from the conical recs as, the spring 36 causes thecollar 37 to press against :1 fibre washer 88 interposed between sold collar 3? and head-stock frame When. the clamp member 85 is engaged with. the conical 34, the tension of the so n is taken between the collar 37 and boil: of which are rigidly secured to We shaft 31. In this position,

' which is the normal driving. zosition of the and has an arm 41 which has a roll tatably mounted on its free end and adapted to engage a cam plate 43 which is fastened to a rod 44 slidably mounted on the bomb stock and tail-stock frames. A reclprooatory motion is imparted to the rod 44 by a lever 45 which is pivoted at 46 to an auxiliary frame 4] fast to the frame 11. Motion is imparted to lsiler 45 by a cam 48 which on ages a roll $9 on til? lever PP en of the lever "-15 is slotted at 50 i9 Q1! 8 a block 51 pivotallymounted upon a. .Slfifii' 52 which is fastened to the rod is The cam 48 is fastened to a shaft 53 and rotary motion is imparted to said haft 53 and no cam 48 by a worm gear 54 which is fea toned to the shaft 53' and is rotated by a worm 55 fast to the countershaft 16.

Referring to Figs. 4, 5 and 6, the chuck consists of a gripping member 56 split at 57 andprovided with a recess 58 adapted to receive one end of the blank A which is to be ground, The gripping-member 56 has a screw-threaded "sb'e'iik' 5? o its rear end which has screwhi'eaded engagement w a shaft 60. The rear end oftlie shaft lid is screwthreaded at 6i to receive a nut 62 which bears against one end of a bearing 63 provided in the bracket 64 fast to the head stock frame32. The bearing (53 at the opposite end from the nut 62 is provided with a conical recess 65 into which a conical e01- lar 60 fast to the slmftGO projects. A clutch sleeve 67 is rotatably mounted in'beurings 68 provided in the headstock frame 33 and is provided atits front end with a conical recess 69 into which a conical head 70 of the gripping member 56 projects. The gripping member 56 is prevented from rotating relatively to the sleeve 67 by a pin 71 which projects into a slot 72 extending longitudinally of said gripping member. In order to adjust the gripping member longitudinally thereof within the clutch sleeve 67 :1. hand "wheel 78 fnslcned'to and adapted to in into the shaft 60 and is adjustably locked in 11 collar 74 by a spring actuated pin 75 which is adapted to project into any one of -21 series of recesses 76 provided in the collar 74 and concentric with the shaft 60. A screw-7T in the collar 74 engugei an annular groove T8 in the shaft 60. The collar H is fastened to a sleeve 79 rotatably mounted upon the shaft (30 and upon the sleeve 79 is slidably mounted n clutch member 8!) adapted to engage upon a collar SE3 .i'nst to the sleeve .79. The collars '83 and 81 are prevented from rotating relatively to each other by screws 108 which have scrcw-tl1rcaded engagement, in the'collur 83 and have their headed ouds slidably positioned in recesses 109 in the collar 84. The screws 108 are encircled b springs 110 between their heads and the bottoms of the recesses 109. The collar 84 is 1e spring fink theleft,

S 90 3e and 1 which, in tux.

dably n and The name? my 113 in which s1 is s31 izififi mthz (1-1 zunber is 11 (me end the rppUsjtE end of the tail- 1] w th-ed, and the end ainci iii-ch 5d cha'mt ectm? is inlalfiy'mount 7 a d of saw must \vhlc *he 'h' ad 11% so aqtmn of gains? the en'i 0f the 35 :owment 0f the-bl nndie. toward 1 in th ember luck men .f rum in commode! to guruvided in 2d;

A and awn from s fas- 125 to a a a1 ustably the uun'mgc pro- Eng wheel 3 and 91a!- mulvd 21E H19 iuwor with a. cum fast to the.

(it: 3, flUil ma} QT 1 in sta 1s rotah gitud" Tame wins? @ngzw 1213s; 50 and mix. 2111 inm'vnmciw .ul' 11mg, occur buivmmx the 51min whit? an The 211mm the to the 1'(.L1X i and pro ect- T is :1 12

openmg 121 W Li aded 911g a thumb age- :2 miss ge:

uage in an idbd 1 111's ed abut is in its extreme forward position. The thumb nut 136 is rovided with suitable graduations 137 which extend around the hub portion thereof and register with a suitable I'nark upon the bracket 134;. The graduations 13? represent in one-thonsandths of an inch the movement of the carriage 127. A look not 138 also has screwthreaded engagement with the rod 135 and is attached to the thumb nut 136 by screws 139 being rotatable with said thumb nut. In locating the thumb nut 136upon the rod -135, the said nut is so positioned that during the forward movement of the carriage 127 the nut 136 will abut against the bracket 134 about .0002 of an inch in advance of the actual extreme forward position of the carriage, the lever 130 yielding enough to offset the distance lacking. The arrange ment of the thumb not 136 and lock nut 138 also eliminates any lost motion therebetwcen wl'ien the screws 139 are tightened to clamp said nuts upon the screw threads to prevent rotation thereof.

A rotary motion is imparted to the grinding wheel 120 by its shaft 121 and by a pulley 1 16 fast thereto, the pulley 116 being rotated, see Fig. 2, by a belt 141 which is driven by a pulley 142. fast to the main driv- .ing shaft 10. The belt 141 is kept tight at all times during the reciprocation of the grinding wheel by a belt tightener 113.

The grinding wheel 120 has a reriproca.

tory motion imparted thereto laterally thereof and longitudinally or axially of its shaft 121 by mechanism illustrated in 10 and 11 and consisting of a pinion 1% fast to the grinding wheel shaft 121 and mesln ing into a gear 145, Fig. 10. The gear 145 is fastened to a shaft 1-1-6 journallcd in bearings 147 on an auxiliary frame 148 which is fastened to the table 124. 'llhe shaft 1-16 has a spiral gear 115) fast thereto which meshes into another spiral gear 150 which is l'aslriwd to a shaft 151 iournalled to rotate in bearings provided in the auxiliary frame i i-S and having upon its face an eccentric pin 152 which projects through a block 153 slidably mounted in the bifurcated end of an arm 154. The arm 151 is bifurcated at its lower end and has a pair of oppositely disposed screws 155 therein which project into a ring 156 rotatably mounted upon the shaft 121 and held in position thereon longitudinallv thereof by ball bearings 157 and 13S and by a not 159 which has screw-ihreiuled engagement with the rear end of the shaft 121. The 21!!11151 is provided upon opposite sides thereof with a pair of sliding blocks 160' which are arranged to slide in ways 1611 provided in said arm .151 and these sliding blocks are pivoted by means of screws 162 to the arms 163 of a lever 161 which fastened to a rock shaft 165 journalled to fastened to one end thereof a lever 166. The lever 166, Figs. 10 and 11, is provided with a handle 167 by means of which it may be operated and also is provided with a spring actuated pin 168 slidably mounted on the lever 166 and adapted to engage any one of a series of holes 169 provided in a segmental bracketl'm which is fastened to the auxiliary frame 148 so that the lever 166 can be moved to different positions and locked therein by the pin 168.

In the position shown in Fig. 10 the lever 166 positions the shaft 165 and the arms 163 so that the pivotal screws 162 will be concentric with the centers of the screws 15?;- and, therefore, when the gear 150 is rotated. the eccentric pin 152 will rock the arm 154 upon the screws 155 without imparting any longitudinal moye ment to the shaft 121 and the grinding wheel fastened thereto, but when the lever 166 is moved. toward the right, Fig. 10, then the arms 163 will move the fulcrum screws 162 alone, the lever 151-,

- together with the sliding blocks 166, and

the fulcrum of the lever 154. will then be located at one side of the screws 155 and consequently an axial reciprocatory motion will be imparted to the shaft 121 and. the grinding wheel attachedthereto. The further the lever 166 is moved to the right, Fig. 10, the greater will be the throw imparted to the shaft 121 longitudinally thereofg -"llms it will be seen that the grindingwheel may be reciprocated laterally thereof or longitudinally of its shaft to any desired extent.

This reci rocatorv motion of the winding .31

wheel laterally thereof is for the purpose of breaking up any lines in the grinding of the finished article.

The grinding wheel 120 as it wears and as it is trimmed off to makeit true upon its periphery has to be adjusted to make up for the difference in diameter of the grindingwheel thus occasioned and this adiustmoot is performed by means of a hand wheel '1 171, Fig. 2. which is fast to a-screw 172 having screw-threaded engagement with the carriage 127 and is rotatably mounted in a bracket 17 3 which is fastened to the slide 126. By rotating the hand wheel 171 in one direction or the other the screw 172 will be rotated and this will cause the slide 126 to be moved upon the carriage 127 forwardly or backwardly as the case may be, and will more the grinding wheel forwardly or back-- wardly to make up for wear on. the periphery of the grinding wheel. An index finger 174 is fast to the bracket 173 and graduations are provided upon the surface 175 of the wheel 171to indicate the amount which. the wheel 171 is to be turned forad jnsting the grinding wheel in the manner hereinbefore set forth.

For certain classes of work it is desirable to set the grindingwheel at differentangles rating nuts 189 and 181, Fig. 10. The ile 12 is fastened to the slide 126 by a cw 1M2, Figs. 2 and 10. which projects *oug'h a slot in the table 124 and has :rew threaded engagement with the slide T and Eurther, the table 124 is fastened e lo 126 by bolts 184 which have :rreaded engagement with the table -..l(l project through slots 185 in the. 9.6. said bolts being provided with and thus the table 124, with the mounted thereon. can be set at any l angle upon the slide 126 and clamped hello. This operation is performed by .oosening up the nuts 186 and the screw 182 rotating the nuts 189 and 181, thus .ting the table .124 shout the pivot 125. an amount that the table 124 is rotated its pivot is measured bye scale 18? to the slide 126 and an index finger c Trust to the table 124 Blend; feeding mechanism.

. l2: blanks A are placed by the operator in. a tube 189, Fig. 1. and are prevented -r passing out (it the lower end of the ior to itsbeing placed upon the maa stop linger 190 pivoted to a All which is fastened to the lower. t the tube 189. said stop finger printo the tube 189 to engage the lowblanl: in said tube. and 'i'reventing' W downwardly and out of the tube. "tine tube 192 is fastened to the headt. machine and has a sleeve 193 upper end into which the lower tube 159 projects, while the collar 1st the upper end of the sleeve stop linger 190 is then thrown and baekwurdly into the position through the magazine tube 192 to the end thereof; and when they arrive at Pgi'iil lower end, the lowermost blank will against the adjacent face of an arm 1 been the parts are 1D lhUPOSltlOn illus- F1". The arm 194 ismounted 'lin 5 ot a pin 198; to another link 199 pivots-lily connected at 200 to a pivoted at 2052 to the auxiliary low r end of the lever 1201.

et; n a stud 195.1 1 12-. and has an' unmet-ted by a link 19? by meanshas a roll 2-03 rotatably mounted thereon and engagrng a cam 204 which is fast-to the shaft. 525 and spring 205 is connected to' the lever 520i and keeps the roll 203 in engagement with said cam 204. The distance to which the arm 196 can be rocked by the spring 205 and the cam 204 is adjusted by means of a. screw 206 which is adapted to engage the arm 196 when the arm 194 is in the position illustrated in Fig. 2, that is. in the position where the blank is delivered to the chuckand.tail-stock spindle. The arm 194 has two fingers 207 pivoted at .208 to said arnn These fingers are provided with semi-circular notches 209 in their forward ends and are kept ap' art at'their rear ends by a spring 210, the distanceto which they can be moved apart being limited by stop pins ill. to. the upper linger 207 to prevent-the blank when it slides out of the magazine from, sliding from between the fingers 207 and dropping on the floor.

encral ope-ratz'o-l l- Assuming that the machine is in a position where it has dropped out one finished artiole and is ready to receive a blank to grlnd the same into a finished article, the operator starts the machine by moving the handle 27. Fig. 1, tothe left. This would cause the clutch member 26 to engage the fingers 28 and lock the pulley 14 to the shaft 16, whereupon'the cam shaft 53 will be caused to rotate through the medium ofthe Worm 55 and gear 54. thus rotating all of the cams on said shaft 53, namely cams 48, 133 and 204. This woulchpertorm the following operation in the sequence named, first a blank it would be brought "t'rorn the magazine tube 19'' by the lingers 20T'and arm 194 into' alignmentwith the chuck 06 and tall-stock A stop plate 212 is fastened the chuck 56 to grip the blankin position to be ope 'ated upon by the grinding wheel. Then through the mediiim of the cam plate 43 and through the ram lever 41 and clutch members 34 and 35 the'drum 30 would be looked to the shaft 31, and thus by the r0- tatirin of said drum and shaft the head and tail-stock spindles and the workbeld between them would be rotated. The grinding wheel would then be brought quickly forward into contact with the work by the cam 183, lever 139, link 129 and carriage 127.

with the arts mounted thereon includin .e 5

the grinding wheel. After contacting with the work the cam 133 is so designed that the grinding wheel feeds slowly into work "during the grinding operation and is then 'positlvel stopped from further ad= Vance and he (I to the work by the stop bracket 13 1 and thumb nut 136 and'rod 13h, while the rotation of both the grinding wheel and the work continue, therc- "y' grinding out the results of any spring or backlash .in the machine or work and producin' extremely accurate work with a fine finish As above stated, the grinding wheel may be reciprocated axially while it revolves, the amplitude of this reciprocating movement being determined by the adjust ment of the hand levcr 166. This reciprocation ireaks up an lines that otherwise might be formed on t e work and cooperates with the rotary motion to produce a finely finished surface. The reciprocating movement may be stopped at any time by adjusting the lerer 166 so that the axis of the pivots 162 come into alinement with the pivot screws 155. When the grinding operation has .been finished the wheel is then quickly backed away to its initial position, the rotation of the work and its rotating devices are stopped, upon the withdrawal of clutch -rotating mechanism to rest.

member 35 which causesjs'pring 36 to exert its pressure through collar 37 and washer 38 against the head-stock frame 32, thus -causing washer 38 to act as a brake to assist in quickly bringing the work-holding and The work holding means is now released, the tailstock spindle is withdrawn and the work is ejected. by means" of the spring actuated ejector 11ior by gravity acting, upon the work after the tail-stock has een withdrawn and the chuck released. It will be noted that as soon as the blank has been caught between the tail-stock center and the holding devices upon the head-stock spindle, the feeding fingers 207 are withdrawn from the blank and retreat to the magazine and while the machine is performing the rest of the operations hereinbefore'set forth, the feeding fingers receive a new blank and are again ready tobring it forward at the proper time to be positioned as hereinbefore set forth.

After the grinding wheel has been returned to its initial position and the finished article ejected from the machine as described, the operations hereinbefore set forth are repeated on another blank, and thus the operation automatically continues until the machine stop ed by the operator shifting the lever-337 tot e right, Fig.1,

' It is to be understood that in some classes of work a gripping chuck is not re uired, the work bein driven in some cases y the head-stock an tail-stock centers, by friction alone and I do not wish to be understood .rotary grindin member, means to mow as limiting my invention. to an specific means for holding the work an rotating the same. Having thus described my invention, I desire to claim as new is:

1.; A grinding machine hat-i? g, in. certain nation, means to grip one end at blai. means to ro-tatably supportthe opposite ends of said biank during the grinding opera tion, means to Fed said blank to said grii r ping and supporting means, means inchnh ing said gripping and supporting means. adapted to rotate said blank, a rotary grind ing member, means to more grindi' member into and out of contact with s blank and means to release 1k iron: said. gripping and supporting 2. A grinding machine having, in ems ination, a headstock, achuck mounted npon said headsto of a blank, a magazine adapted to hold plurality of blanks, mechanism to red blanks one at a time from said K into alignment with said chuck, a center therefor and means to mo 7 iii) center toward. said headstock wh. in 5 blank held by said feeding means any inserted in said chuck, means to rot-ate c chuck and tail stock'center whereby a I: tary motion may be imparted to sai a rotary grinding member. and move said grinding member into an contact with said blank.

3. A grinding machine having, in corn hination, a headstock, a chuck mounted n on said headstock and adapted. 1

ck and adapted to grip one a I The E end o'f-a blank, a magazine adapted a. plurality of blanks, mechanism to Iigfiir said blanks one at a time from said mag-a.- zinc into alignment with said chuck, a stock a center therefor and means to are said center toward. said headstock whereby a blank held by said feeding means may be inzerted in said chuck, means to rotate chuck and tail-stock center whereby a rotary motion may be imparted to said biank, a1 c said grinding mem or into and out of contact; with saicl blank and means to eject said blank from saidIchuc-k.

4. A grinding machine having, iii-com bin-ation, means to support a blank-at op;- posite ends thereof during the grinding operation. means to rotate said blank, a grinding wheel, means to move said grinds ing wheel into engagement with said blank, means to reciprocate said wheel laterally of said wheel, means to automatically release said blank from operative engagement with its supports and means to eject said blank. from one of stud supports.

5. 'A grinding IllflClill18 having, in combinationjineans to. support a. blank at opposite ends thereof durin the operation, means to grip said blank at one end i ink. ling mach grimlblank finial nt the lil 'li" ill M15 t HM when; with said blank "ely pr m mxgi'i ippm't oml ofsnirl blank {incl eject sax SEllll gji'ip is :ml b'lziigk, renmve the ping mum fliei'eo f, mm 1a to a grinding whee lug wheel and means m 51 5 tion of 5 blank.

in cambi :1, mil-st n li u 063; adapted 7 mini: thei'vbeflveen,

1mm l min en- Yxcvcw 21ml 5 thereof (luv vans lri ml-ate 209i, mums 61 pusite vml 0min;

mg n

with. said 95 11$ liiaml xiii? wnrl agement 'Wl'i' l1 and 1 mm Hal;

v0 agemmit, wit

a: origin! zine '1 anions Uta k fium umim'ts.

ppmt

g: ceniviwill blank, 11 lb evil whine liu cans in mm a the ca aid Imam: in m2":

0e il-a ica frmn said m and urn-mas in cessiwly 'pi'qvmit the i v the l: il'li its grinding moans to an aim in 1,) sin: aid lalzu reznm' l f s g'a anli moan.

and ieleas atiun at une 0nd thaweuf (lflllil oral-ion, me other EWltlfll'fi a grinding wheel, 1 in} Wheel into en and means 9 tion of blank and the other em means to automat U gagomont W I one from ipm'tl said mugnzin to said ping mean.

rig and of and grip- E3 Ll 1 :01 1K. all

rich

grind-in sans to s the binatiom in posit rim; mm mamed Elfll'ihf salami;

ether t a airing the gi'i 1321?; l ml. poi-t from ll pm v I e E of (l is 51: ppm

i'vel grip 0 achin inc min HD he 512' ei'ation end the grimling blank, :1 law level: and me adapted to success of said blurs! and reinme. 1' of said blank.

9. A grimlin alum, posits agisupport iii-mg means to ends tliereaf 120 the ,jlll'lf (i rind ax can: adapted =s1vely 5&0.

s-aucl headstock engag and ma ripping e1, meas'is to mmfu 'ament will:

zurtu- (1 said 1 am ziuupt ans (l ms to gzip said lalzml; at

:ms to rotat rimling XIlhl ruling wheel into (alga .1111 1', n c

and, 11m adapted t0 successivsly m'avent'tlie blank, ungrip (we end 0f w the the nther end of said blank, :1 magazine and f, me a C, :1 lave M01" 1 said.

operation, end t-liel'eo means said g3? 55 said bl ate said 1 lever rotation 0 one 3-. nimliiiie hm ails knck part mil means to rotate saidblank, a grinding wheel,

a carriage upon which said grinding Wheel is mounted, means to set said grinding wheel at different angles upon said carriage, means to impart a reciprocatory motion to said carriage, a lever, a cam adapted to operate said lever to successively stop the rotation of said blank, causesaidheadstock to release said blank and remove said -tailstock adapted to impart a rcciprocatory motion to said carriage, .a stop for said carriage adapted to eliminate the results of inaccuracies and lost motion between said cam and the connections to said carriage, means to rotate said cam, means to set said grindingwheel at dilierent angles upon said carriage, a magazine adapted to hold a plurality of blanks and means to feed said blanks one at a time from said magazine to said headstock and tailstdck.

17. A grinding machine having, in combination, oppositely disposed means to support a blank at opposite ends thereof and mechanism to rotate both of said oppositely disposed supporting means during the .grinding operation, means to feed said I blank to said supporting means, a rotary grinding member, means to move said grinding member into and out of contact with said blank, means to impart a reciprocatory motion to said grinding member in a direction substantially at right angles to its plane of rotation, and means to release said blank from said supporting means.

18. A grindlng machine having, in combination, oppositely disposed means to sup port a blank at opposite ends thereof and mechanism to rotate both of said oppositely disposed supporting means during the grinding operation, means to feed said blank to said supporting means, a rotary grinding member, means to move said grinding member into and out of contact with said blank, means to impart a reciprocatory iuoiion'to said grinding member in a direction substantially ,at right angles to its plane of rotation, means to adjust the ex tent of said lflStll'lQllilOIiCClmovement, and means to release said blank from said supporting means.

15), A grinding machine having, in combination, means to support and rotate a blank, a magazine adapted to hold a plurality oi blanks, a carrier, a pair of spring actuated fingers pivotally mounted on said carrier and adapted to receive a blank from said magazine and means to move said carrier with said fingers and a blank held thereby from said magazine to said supporting means, a rotary grinding member and means to move said grinding member into and out of contact with a blank held by said supporting means.

20. A grinding machine having, in combination, means to support and rotate a blank, a magazine adapted to hold a plurality of blanks, a lever, a pair of spring actuated fingers pivotally mounted on said lever and adapted to receive a blank from said magazine and means to move said lever with said fingers and a blank heldthereby from said magaaine to said supporting means, a rotary grinding member and means to move said grinding member .into and out of contact with a blank held by said supporting means.

21. In a grinding machine, the combination of a grinding wheel, means for rotating said wheel, and mechanism for vibrating said wheel axially thereof while it revolves,

said mechanism being adjustable to stop the vibration of the wheel without stopping either said mechanism or said wheel.

22. In a grinding machine, the combination 0 means for supporting and rotating a blan for: the grinding operation, a rotary grinding wheel, mechanism tor relatively moving-said grinding wheel and blank to bring them into operative engagement, mechanism for vibrating said wheel axially thereofwhile it operates on said blank, and means whereby said mechanism may be adjusted while the wheel continues to revolve and said mechanism continues in operation to change the amplitude ofvibration of the wheel or to stop said vibration, as desired. 23. In a grinding machine, the combination of a rotary grinding wheel, power driven jf e'chanisiu including a lever for r ciprocating said Wheel axially thereof while the wheel revolves, and means including a lever operable while the wheel continues to rotate uninterruptedly and said mechanism continues in operation to adjust the amplitude of vibration of said Wheel or to stop said v bration, as desired.

24. In a grinding machine, the-combine;

tion of means for supporting androtating a blank for the rinding operation, a rotary grinding wheel or operating on said blank, mechanism for relatively moving said grinding wheel and blank to bring them into operative engagement, mechanism for vibrating said grinding wheel axially thereof while it operates on said blank, and means operable to stop said vibratory movement without interrupting the rotation of said grinding wheel or ptherwise changing the operation of said wheel on said blank.

In testimony whereof I have hereunto signed my name to this specification.

- iVARREN F. FRASER.

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