US957935A - Grinding-machine feeding mechanism. - Google Patents

Description

C. M. CONRAUSN.

GEHJDING MACHSNE FEEDING MHfHANISM.

AYVLUZATIOH FXLED NO H,

4 SHEETS-SHEET 1.

Patented May 17, 1910.

C. M. CONRADSON.

GBINDING M ".CHINE FEEDING MECHANISM.

APPLICAI'ON FILED NOV. 18,1907, 957,935, Patented may 17, 1910.

4 IHREN-SHEET' 2.

IIIHLMW lul INVENTOR.

WITNESSE C. M. CONRADSON. I @BINDING MACHINE PEEDING HBCI-umani.

APPLICATION YILED FOY. 18, 1907.

Patented May 17, 1910.

4 SHEETS-SHEET 4.

. wlTNfssEs.

ishing it to the exact. size.

'UNITED sTar-nsrrtTENT OFFICE.

CONRAD T:. CONRADSON. OF MADISON. W'ISCONSIN, ASSIGNUR' TO VEBNETTE E.

' PRENTICE, Of NEU.r YORK, N. Y.

GRINDING-MACHINE FEEDING MECHANISM.

Specicatlon of Letters Patent.

Patented May 17.. lult.

To all whom it may concern.'

Be it,- known that I,-Co.\'e.in M. Comui sox. a citizen of the United States, residing at Madison. in theconnty of Dane and State of \\"iscoxisin, have invented a new and useful Grinding-lilachine Feeding Mechanism,

of which thei following is'a specification.

My invention relates to machines for grinding plane or cylindrical surfaces with a rotating emery or other abrasive wheel or pencil.

One object of my invention is to obtain a very recise control of the abrasive wheel relative v to the work, in order to produce the work more accuratty and Vmore economicalliv than hcrctoi'ore.

Another object is tt; have the feed operating mechanism convenient, and .so that 'the abrasive wheel can be moved either to or from the work precisely. i

Still another object is to provijlegleiins adapted to make the feed4 optionz.ll}y variable or constant and also to have the machine automatically stop grinding when a predetermined Size` of work is reached.

I believe that l am the first to apply n. variable feed to a grinding machine. On one well known make of grinding lathe there.

are two feeds so arranged'that the operator can use a coarse feed at first Vfog(roughly grinding the work to 'approximately the re.

quired size and then use a fine feed for-fin- But my new feeding mechanism for grinding n\a.him:-- can feed intermittently l-y a constant or varying increment. depending upon the predetermined shapc of the cam face. and v-ln-n the work isfabout the required size it "an stop feedingand allow the work to make a predetermined number of passes hei'ore the machine automaticallv stops, or is sloppedhv hand. This ability to var v the feed and to use a cam of just the proper shape for the work in hand. is a 'alcalde improvement, as for instance .if the wolk is a casting or forging. on which the surface to be ground has not previously been machined. as by a lathe or a planer. then he surface will probably have unevcn'partsand small projections. Or if the work has previously been roughly machined llcaving the lool marks. in either ease. myanen"grinding machine feeding mechanismfau be made to :feed by large increments at first reu'ioving graf-'ally decreasing increments as the work approaches the Finished dimensions, and thus accomplish the same or better results in about one half of the time required by the old and non-sensitive constant increment feeding mechanisms now in use. I obtain these and other results by the use of a cam mechanism, and a knife edge mechanism, both of the said mechanisms are shown but the cam mechanism only is claimed in this application. The knife edge mechanism is claimed in another application. Serial Numbei' 402,771, tiled November 18 1907.`

The invention consists in the construction and combination of parts to be more fully described hereinafter and particularly set forth in the claims. y

Referring to the accompanying drawings forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the views- Figure 1 is a partial plan view of my grinding machine feeding mechanism shown partly in section. Fig. 2 is a partial front View of the same willi thc hand-wheels and cani removed. Fig. 3 is a plan view shown partly in section of the mechanism for actuating the feed through a connecting rod. by means of a reciliroeating table. Fig. 4 is a broken front View of the feeding mechanism showing the. hand wheels and ratchet wheel. Fig. 5 is a front view of the mechanism for actuating the ratchet wheel through a connecting rod. Fig. (3 is u broken sectional view of the reciprocating table showing the adjustable dogs for operfating the ratchet connecting rod through' intermediate mechanism. Fig. 7 'is a front elevation of a grinding machine for c vlindz'ical work equipped with my new feeding mechanism. Fig. S isa side view of the same with a part of the feeding mechanism removed.' Fig. fl is a top view of the same witlia part of the feeding mechanism re moved., Fig. l() is a partial neapview' showing thegrinding wheel slide 'cunterweight mechanism. Figs. 11 to 29 are detailed views." Fig.ll is a development of lhecross- 'feed 'c am, Fig. 12 is an end elevation and Fig. 13 a plan of the feed-adjusting crank; -Fig. l-'l isa plan and'Fig. 15 a side elevation of the traverse trip-lerer; Fig. '1G is a plan and Fig. '1T an elevation of the reversing f clutch trip-lever: Fig. 1S is a plan and Fig. the high spots on the. work, and tten by l 28 is a plan and Fig. 29 an elevation of the feed-lever fulcrum abutment washer. In F ige. 8, 9, and 10, 1 is the main base of the michlne, 2 is the wheel base securely f bolted to the main base, 3 is the table adaptrlfto reciprocate in the 'tracks 3', 4 is the swivel rigidly clamped to the table 3 and u n which .are mounted withlongitudinal a justment, the headstock 5 and tailstoek 6, the headstock having means to rotate the work 55 on centers 5 and 6', 7 is the wheel slide mounted to slide at right angles to the table in the tracks 7' in the wheel base 2, on this slide is rotatively mounted a spindle 8, Fig. 10 having its axis referably parallel to the track 3 f, fastene to the spindle 8, is an abrasive why el 9, of emery or other material. Also fastened to the spindle 8 is a ulley 10, fastened to the wheel slide 7 is a alf nut 11 en gin'r'the threaded portion of screw 12, the atter eing journaled in the base l and wheelbase 2, Fig. 8. and also adapted to slide longitudinally therein. Pivoted on the bushings 13 and 14 and 1ocated inside of the wheel base'2 is a bell 'crank 16 in which are mounted two rotatable idler pulleys 17 and 18 and respectively on studs 19 and 20.

The bushings 13 and 14 are fastened in the wheel base 2 and have journaled in them the driving shaft 21 with its axis parallel to the axis of the spindle 8. This shaft can be rotated by several well known means as by a moving) belt on the pulley 22. The said pulley eing keyed or otherwise fastened to the shaft 21. Fastened to the shaft 21 inside of the wheel base 2 and between the bushings 13 and A14 and also between the two sides of the bell crank 16 is a. driving.

pulley 23 Fig. 8. An endless belt 24 operative connects the driving pulley 23 and Kind e pulle' 10 and passes in contact with eidier pul cys 17 and 18 and thus causes the rotation of the abrasive wheel 9v actuated primarily by the said moving belt on l the alley 22, pivotally attached to the bell eran 16 is a counter weight 25 formed of 55' several separate plates partly so as to admit adjustment of the tension in the belt 24. This counter weight 25 also through the bell crank 16, belt 24 and wheel slide '.7 holdsthe mit 11 ti htly and without lay against the 5 thread o l the screw 12. he thrust thus caused on the screw 12 is taken by a knife edge which will be hereinafter fully explained.

Adjustably fastened to the reciprocating 65 table 3 Figli `inthe slot 3 by the screw 26 and nut 27 is the dog 28. Threaded into the dog 28 F ig. 3 is an adjustable knurled screw 29 having a knurled nut 30. 'lhe otlice of this screw is to actuate the ever 31 Fig. 5 fastened to the shaft 32 by means of the pin33. Similarly another do;y 34

i Fig. 6 and Fig. 7 is adjustably fastened in the slot 32 and has threaded into it a knulled screw 35v having a knurled nut 36. IThis screw points in a direction o posite to the direction of the screw 29 an is located in the dog 34 so that it can actuate the lever 37 Fig. This lever is fastened te the shaft 32 by means of a pin 38 Figs. 16 and 17 are detailed views of the levers 33 and 38. Fastened to the lower 4end of the shaft 32 by means of the pin 39 is a feed plate shown in detail views by Fi 12 and 13; this piate is slotted and has tted therein a block 41 adapted to be adjusted by the screw 42. The screw 42 screws inw 'the block 41 and shoulders in the bearing 40 Fig. 5 of the feed plate 40 and has a knurled knob 42 pinned to it by the pin 422 Fig. 5 by which the block 41 can be adjusted from the maximum throw to zero. The block 41 has a cylindrical portion 41' Fig. 12 forming a bearing for the connecting rod 43 and tapped into this turned portion 41 is a. screw 44 with a sutiicientlylarge head to prevent the said rod 43 from dropping off. The feed plate has an arm 402 into which is riveted a stud 45 at the lower end of this stud is ivotally connected a s ring 46 in tension i` ig. 3; the other end o this spring is similarly fastened to a stud 47 fixed in the base 1. l

Fastene'd to the feed plete 40 Fig. 5 and thus to the shaft 32 by the in 39 is a double armed lever 48 shown' 1n detail by views Figs. 14 and 15; this lever is ada ted to actuate the rod 49 through the stu 50 Fig. 3 and this rod is limited in a reciprocating mation by the studs 51 and 52 striking the baseV 1. The otlice of the rod 49 is to control -thc meenanism that reverses the direction of the motion of the table 3, `and by means of the said Studs 5l and 52'and the double lever 48 the intermittent oscillatory motion of the shaft 32 is limited in both directions being preferably approximately one half of a turn. The shaft 32-is 'ournaled in a bracket 53 fastened to the asc 1 by screws 54. The operation of this part of my rrinding machine feeding mech anisan is as ollows;-Fig. 3 the table 3 upon which the dogs 28 and 34 have respectively previously been adjusted by means of the said clamping screws 26,*und then the screws '29 and respectively adjusted so that the work 55 which rotates preferably in the direction cf the arrow Fig. 9 will pro rly traverse the face of the wheel 9 whicherotates in the direction of the arrow Fig. 8. As the reciprocating table 3,'moves in the fti-"in 'of the ratchet wheel 5T (i7, lil. l! and 9 are upproxinmte).

llireetion of the arrow Fig. il the rounded together b r the .screws (il und pins |35 und end of the heren" 29 strikes the end of the l :ire adopted to oscillate. one on a shoulder lever Il] und has carried it and the shaft,

32 with the inemhcr` attached thereto into 1 thc position slioun which is slightl)` inorethan one hnlf of their totnl motion und :ils-o i 5,0 tlnit the .spring 45' lin siitlieicntly passed theA deanl center, :1nd so that thc tensions of 'attached thereto.

the .sind spring is :imple to complete the totril oscillation of the, .shaft 32 und the members In this extreme position the cnd 4H' Fig. und Fig. 4 ofthe lever 4b will come. in contact with the stud 5f) und more the rod if) until the stud 52 strikes the hase l. Similairl) when the tnllc 3 moves in the direction opposite to the :irron' Fig. 3 the roundedeud of the screw in the. dog 34. strikes the. lever 8T and b v means of it :ind he spring 4U the end 4S: of the double armed lever 48 will collie in Contact with 'lite stud 5t) :1nd more, the rod 45) until the stud 51 strikes the buse 1 thus completing the oscillation of the'sluift 32 in this direction. It will he noticed that the first )art 'of thc :it-tion of the. shaft 82 in either direcvtion is' always positive. being:r actuated rc- `ciprocnting tnhle 5l and that the lnttcr p nrt is .ilu-'urs by the power of the tension spring lu. This positive motion of the connecting rodsli :ictuntes a riitehet wheel 57 While the motion due if.

-Ilie spring 4G merc] returns the. ratchet pdr? GO for n new grip onthe ratchet wheel 57. It will further he noticed that. the positive motion of the rod 4? .is

:ilu-.nys -in-the 'sinne direction, and that the ldirect ion.

hastened to the feed late 40 is a scale 56 Fig. 5 und 13 graduate and figured so that euch graduation respectively indicates a totti] niainbir of table reciproeutxons necessary to commute o ne revolution of the ratchet wheel *17 Vlien the block 41 is adjusted to that imrtit'gulnr*graduation by the screw 42; for

instance .if the ratchet wheel .'-T contained 1 2@ teeth and the feed phite had twelve grmlnntions they wild ref-pcciivcly indicate ,120. oo. to. man. i?. if. 1:1. 12.11, nt t n .passes of tlectzehle lo complete one revolu- A 'llm-t is the pzii'l ti() could optionally he nnnie to take either 1. 2, fl.; l. 5. V. 7.54. t). if). l1. l 2.or,1i teeth ofthe ritelmt wheel .57 it euch passo'f' the table 3.

i". :.\\'l 60 is pirotcd on a stud 61 held by :l p lntc S21-.nda cover plzite (35i: the platte 62 being sutliciently out :iwirr to allow proper l.action of the puwl, ratchet wheel. and connec-ting rod, as .shown by dotted lines in Y1` ig. 4. These plates ('32 and G3 are fastened l I l l 3S' on the hub of the com hund wheel .3S and the other on the '-liouldcr 57' of the ratchet wheel 5T, by menus of the connecting rod 43 which is pivotnlly connected to the said plates through the stud G6; this stud tt' is shown in iis preferred relation to stud 61 in Fig. 4.

Fnstcnctl te the inside of the cuna hand Wheel 555 by means of the kejv H7. nml screw titi' is :i cnn: titl; the cuni surface 6H" can be various :shapes to snit the various kinds of work being ground. it is intendcd hiit; the operator shall have several cav @n hand to select from. Fig. 11 is u ne; .'opment suggesting one forni the com surface 6U' nini' tnkc. Beginning :it the point near the :irrowthe cznn has n rapidly rising surface increasing b v variable increments until at the extreme left it termin-.ttes in a straight line. The cum surface G91 is adapted to :ietuute :i roller Fi 1 with a preferably crowned periphery; tiiis roller is supported byu.: stud 71 fastened into one end of the mounted on it two knife edges 78 shown by detail views Fig. 24 and F ig. 25, is slotted and strnddles the screw 12 with sufficient clearance to perform its function without touching the seien'; -into portions of the lever 72 is threaded a ring 73` having spanner holes 73x :ind having the inner surface 732 adapted for a knife edge hearing. The slotted end of the lever 72 has grooves 72= Fig. 24-iidzipted/to receive the knife edge 74, shown ny oetailed views Figs. 2S and 27; this knife edge. is held in'po'sition on the lever 72-hy :zins 741; the sides 72 of .the lever 72 are ndjustably fitted in the cam block 75 shown in' detailed views Fi rs. 18 :md 12); this block is fastened to the. ase l b v the: screw 76, adjustahly mounted in the czimhlock 75 is u slide 7'( adapted-to straddle the lever 72 and screw 12; this slide has mounted on it two knife edges 78 shown by detailed views Figs. 22 and 23;.these are' tongncd into the' slide 77 :ind :ilso pinned thereto by the pins 781; thc slide is ndiusted b v means of the screw 79 and graduated knol S0, the screw 79 being shouldered in the cam block 75. 0n the screw 12 is a. .shoulder collar 12x and against this is located without play a .splitwasher and knife edge hearing 81 shown also by detailed views Figs. 28 and 29.

The operation is as follows: The screw 12 has a. continual pull in the` direction ofthe uri-ow Fig. 1 due to the counter weight, 25 Fig. 8 thus forcing the knife edge bearing S1 against lie. knife edge 74 mounted on the lever 72, and this lever in turn through the ring 73 which is threaded into it forces the surface 732 of the said ring against, the two' knife edges 78 fastened on the, slide 77,

surface 69 of' the cam 69. Now assuming that the cam surface 69l approximates the of an inch and the adjustment of the slide 77 'l bv means of the screw 79 is sufficient to allow the relation of the distance from" the bearing point of the roll 70 to the b caring edge of the knife edge 78 and the distance of the bearing of the knife edge 78 to the bearing of the knife edge 74 to be respectively as 3 to 1 as a maximum or 3 to 0 as a minimum then the maximum throw of the screw will be of .18 or .06 of an inch, then if the threads of the adjusting screw 7 9 are 20 per inch, and the number of graduatlons on'the knob 80 are 60 then 1 graduation would indicate l li 1 .BX-dx .00005 of an inch movement of the screw 12 'or .0001 of an inch change in the diameter of the work, and one turn of the knob 80. would indicate .006 of an inch chang in the diameter of the work 55 and 20 turns would give the maximum or .12 of an inch variation.

The abru t portion 692 of the cam 69 Fig. 11 is inten ed to allow the wheel slide 7 and wheel 9 to move suliiciently far back from the axis of the work 55 to allow the easy removal of the saine and the inserting of another piece; when this new piece of workis in place on the centers 51 and 61 of the grinding machine and the machine has been started .it is not necessary for the operator to wait until the whccl 9 duc to the action of the cani 69 reaches the work 55, he can turn the cam hand wheel 58 in the pro er direction bv hand until the emery whee 9 starts grinding and theii allow it to continue automatically until it knocks ofi or stops itself, by means of the above said abrupt ortion 692 of the surface of the cam 69 ig. 11, which allows the counter weight 25 to pull the wheel 9 away from the work 55 because of the roll 70 droppin over the aforesaid abrupt portion 692 of tie cam (i9. The hand wheel 82 is fastened to the screw 12 by the key 82l and has rotativel mounted on its hub 82 a disk 88. This disli can be clamped to the said hub by means of the lmurled screw 84 threaded into the end of screw 12, the point of which 841-enga-ves one end of a conically pointed pin 85 an is adapted to force the other end of the said pin into one side of the annular grooves 831 in the disk S3 and thus clamp the disk 83 and hold,- it rmly against the surface 82a ofthe hand wheel 82. When it is desired to adjust the so that one turn of thexj.

of an inch movement of the abrasive wheel Y 9 or .001 of an inch change in the diameter y of the work 55.

Fastened to the plate 62 by a screw 86 is a plate 861 Fig. 4 having an index line thereon b which the amount of adjustment of the isk 83 c'an be ascertained. The hand wheel 82 and disk 83 are used to adjust the wheel 9 relative-to the work 55. The cam mechazdsm hereinbefore described will always knock oli' or stop ding the work as soon as the said whee 9 has reached a limit fixed by the cam 69; now that limit can bechanfred as heieinbefore explained by turning the'lmob 80. It can also be changed a fraction of one thousandth of an inch or more by turnin the hand wheel 82. By making note of trie particular graduation on the disk 83 the emery wheel 9 can be easily returned to the same point after grinding a.

nt mber of other sizes or shoulders on the same or different pieces of work, for instance i1'. another diameter on the work is .200 of an inch larger or smaller, one turn of the hand wheel 82 in the proper direction willv pro erly locate the wheel 9 for .indin the sai shoulder. That is an ynum r of iameters can readily be re r uced by returning the hand wheel 82 an disk 83 to its proper graduated point. Any change due to the wear of the abrasive wheel can when necessary be corrected by the fine adjustment provided by the screw 79 and knob 80 as hereinbefore described. t

Having described my new chine feeding mechanism I wi now give a general description of the operation.

The abrasive wheel 9 being the proper grade and revolving at the correct speen in.

the direction of the arrow Fig. 8 and the work 55 or piece to be ground bein snugly located on t e centers 51 and 61an rotated thereon bv means in the head 5 in the direction of the arrow Fig. 9, and the table 3 reciprocating through a pro er distance in the tracks 31 determined by e dogs 28 and 34 Fig. 7. The operator knowing the approximate amount'of material to be removed from the work optionally turns the lmob 80 on the screw 79 and moves the knife edges 78 until the graduation on the cam block 75 Fig. 19 indicates a maximum total, longi tudinal movement of the screw 12 as for instance .04 of an inch. Then the cprstor ding maoptionally determines about the number of asses or recprocatious the Work must make. hat is if the work is to be reduced in diameter..08 of an inch that is 04 of an inch on aside and the feed of the wheel 9 toward the ax'is or' the Work 55 is to be actuatcd by a cam feeding by constant inerei ments, the feeding taking place at each end back from the work 55 and the work can then be removed and a new piece inserted.

In the above case if the block 41 had been set for twenty asses then .002 of an, inch of material wou d have been removed at each passeroviding that the cam face 69l was shap to give constant increments of feed.

. But if the operator has used a cam with a ieasily be dup icated as hereinbefore experhaps be best.

surface approximately that shown by 691 Fig. l1 then the feeding increments would vary. The rst increments lbeing greater than the last for' the purposes set forth and obviously the Work would be done much v*more uickly and with a better finish than with t e constant feed cam, but for facin a shoulder the constant increment feed woul Afterlthe grinding machine has automatically ground one piece exactly to the required dimensions, it will duplicate anv number of pieces the only element of change being the Wear of the inding surface of the wheel 9, this is iiown to be very little ordinarily and the error 'in the work can when necessary be corrected by trning the knob 80.

Work havin a number of diameters can lained b noting the respective graduation on the dis I claim: 1.' In a. grinding machine feeding mechanism, a wheel heed adapted to be actuated in.' one direction by a cam and in the opposite direction by accunterweight ivota ly vsuspended from a bell crank and t e latter connected by a belt to the said wheel head, substantiallyas described and for the purposes set forth. Y

2. In a grinding machine feeding mechanism, a rotatable cem having .ra tchet teeth an oscillating member with a pawlradapte to rotate the said cam, the said oscillating member actuated by a connecting means an the reci rocatJ table motion,l m combination wi a tab e and a means for'reci'proca it.

3. a grinding .machine feeding mechanism, a rotatable cam, an oscillating rocker, y

a feed-plate, means whereby the said :feed` plate intermittentiy actuates the said cam,

in combination with a. table and means for reciprocating it.

5. In a grinding machine feeding mechanism, a rotatable cam, an oscillating rocker with a feed-plate, and two arms, the latter respectively' adapted to be actuated by two dogs fastened to a reciprocating table` one dog initiating the action when the table moves in one direction and the other dog initiating the action when the table moves in the other direction, and a spring completin both of the said actions, in combination witg a table and means for reciprocating it.

S. In a grinding machine feeding mechanism, a rotatable cam, an oscillating rocker. with a feed-plate, a spring, and two anna, the latter respectively adapted to be actuated by two dogs fastened to a reciprocating ta.- ble, the said feed-plate having a poaltive stop for such extreme position of the oscillation; a table, and means .for reciprocating it.

T. In a grinlg machine feedin mechA anism, the combination of a rotatagle cam, operatively connected to an oscillating rocker with a feed-plate, and two arms, the latter respectively -adapted to be actuated by two dogs fastened to a reciprocating table, a spring und means to continue the oscillation of the said rocker in the direction initiated by the said dogs, until terminated by a stop means to adjust the longitudinal motion o the said cam connection; a table, and means for reciprocating it.

8.' In a grinding machine feeding mechanism, the combination of a reciprocatlng work table, a rocker' adpbedto be intermlttently oscillated in alternate 'directions by the said table, means whereby the sald rocker gives intermittent rotation ton cam in a constant direction, a lever adapted to be actuated by the said cam, and 1n turn adapted to give motion through intermediate means to a. wheel head having a rotative abrasive wheel mounted therein, a cem, and

a wheel head.

In ttimony whereof I aix my signature in the presence of two witnesses.

' CONRAD M. CONRADSON. mmm

F nomen D. Swann, Amm E. Mom.

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