US2538461A - Polishing or lapping machine - Google Patents

Description

Jan. 16, 1951 .1. G. KAVENY POLISHING 0R LAPPING MACHINE Filed Dec.

Inulle Patented Jan. 16, 1 951 c. e3:

A Urn-'riso STATES 253s,46,1 e ,l

POLISH-weon- Llnlnrert MACHINE John, Gordon Kavny Montelai Appliaqnnecember 15, i948,l seein-'Nei 65,433'

'f "I'hsfinv'ention: relates to improvements; in .gpcflishingr'cnlalgmingmachinesJ ofi the type usedi in nisfhing dies;V and', more especially for polishing the' die apertures of tungsten carbide. Wire drawl'in'gfangisimilar dies The --finve'ntiomv has .for an object to f' prot-ideen improved. .construction of polishing orlapping machine. olf-fthe 'type having.' oppos`ed-.-head; and tail steaks, wherein-the tai1`st0ck-inciudeg;means tof; support .fai Erotatable spindle .provded' with a ehueky ier; operativelyceupl-ing. aY lapping' to'olfor gpinltherewith, and imtherineludinginevel meansv fdr":reciprocating-fthe spindle: supporting`V means with:;..oscillatory movement together.. with means foeregulating thehearing tension o'jthenperllappingatoel or pin-upon the Workfwhereby tu'. produce af.y constant rubbing kcontact Y yof vsaid lapping tool or pin .with the. surfaoefeff the-Work under-treatment, vwhich eOntaGt'-V is aecornpaned by tensionall thrustefr the Mormer `toward `the latter odesireddegree.

.Other ehjeetsf-ofi the vinvention.,v not atrths time 'more;-;particularlyenumerated, will Y' be under- 'steodfgfrom the :follow-ing detailed description oi fthesame; 3116K An illustrative embediment/.is shownin. the

. aceompanying drawingsinzwhichf Fgl isa side elevationalview of-.thepolishing or lapping machine accordingptathis invention.; Fig-Z is a transversevertical seetienal-View, taken on line 2-2 in Fig. l; and Fig. 3 is a fragmentary sideelevationalview, with. partgbreken .away and partsinlongitudinalsection...

vSimilar charactersof reference. are employed in the, hereinabove describedviews, toindioate eor- 'responding parts.

Referring to the drawings, the reference char: atelxl' indicates lthe ba'seof the machine, the "saine being preferably supported fby legs 'Il. Mounted on Qneend ofthe base .lli is the usual headistoek I2 With whioh a'polishingor lapping machine of the kindstated isjpr'ovided. Rotatablymounted in the head steek i2. isv a head stock spindle( 1.3 which is provided with collet. 14 in whichthe die or other'work .l5 te bev treatedis clamped. lhecollet,Mv is operated by avidra'wr-in barili having a handle l1 forfrnanipulatng the same. Fixed onV said .spindlemi3 isa step pulley l,over which can. be riinapovver transmission heltf- -notshown). by which the maohineis-operf ated -.Alsoaxed-.on the spindle'` 1.3. ,is adrive Journaleein .thefbaselsee-t6 extend; ieneitw ytnerethrougnais-.a eounzerihaft n.. .Fixed adjnstment:V towarduandetromgthe above. described.

headstock mechanism, is-:the Aear-riag'e memberli ofthe .tail stocastructure of the machine. Said'y carriage :memberf 2-3 -.Can be Secured yteZ the. base mg; inrzadjfusted position thereon. by a.v clampv ele#- menti Z4 which eooperates--with said base HL. and

which isfadaptedto .be actuated by: an. eccentre cam-125 having hand# lever ..2"5-` by which---it1is manipulatedgiallfi .manner'.knownftotthefart. TEX-A tendmgA rearwardly from. the. carri-age; member," 23 is a' bracketlarml27Min.Whiehrisvmounted aftrans-v l verse: pivotingf`=shaft28- fPivoltally` supported/.by

. to. s'tracl'dle:thebracketv arm 2 so' as to be: re.-

spectively supported-.by their: lowerf ends .upon .thief respective:endsfofsaidpivoting shaft 28'. .@Pivot'- ally'supported iniconne'etion. with the?` uppenend ofthe tail..stock-rframeisfa longitudinallyfdirected bea'fri-nginfie'rnber3U.l :Axed onthe rearward end portion 'of-1. said bearing' member. lrisir a. `yoke 31 having" opp'osit'ely extending transverse trun-nions 32 which respectively pivotally engage in .respe tive upperr endeportions: of the `'side platesvznof the'tail stoeIi-frame, whereby-Ito pivotal'lyisupport the -bearng memberrfor up and .down .oscillatory movementin vertical piane; Rotatably 'supported by! the' bearingmember'. 3D is. a' khollelw vspindle' driving-shaft 331,'- i'nfvvh'zh` is adjustably' `secured 'an axially extendingrspindle 341 Said: `spindle, is" providedat its forward?r endwith a chuck' 35 for operatively coupling alapping teolor'pina to theispinfdle, Fixed-onthe rearwardfendno the I'o0nntershaft2 'fis afdrive pulley 31,- and-.fixed onthe'rearwardv end-of the spindle; driving' shaft run'siove'r the pulleysST/and 38; whereby to rotate the shaft 33, spindle 36" andlappngrtooI-or pin iii.v ncep'ulleyd ison theouter or rearward end* f )ffdriveY spindle vshaft 33;' beltj39= will 'exenta downward pnllon said A shaftand) thereby coun;

Y terbalanelthe j weight@- of' j the inner portion* pf bearing-' meinben vandthe :parts supported reprises rearwardly-,Prof

@eenheid-QiSaidffdllniershaitfl isla-flte? l provides a unitary part of the tail stock frame, and is so related thereto as to extend from a point intermediate the lower end and upper ends thereof. Fixed on the countershaft is an eccentric cam 42 which is disposed below the rearwardly projecting free end portion of the rocker arm 40. Threaded downwardly through the free end portion of the rocker arm 4D is a cam follower stud 43 which bears upon the eccentric cam 42.V Salo cam follower' stud 43 may .be adjusted relative to the eccentric cam 42 so as to predetermine the limit of the back stroke or" the tail stock frame. Cam 42 is axially wide and substantially parallel to the direction of adjustment of `carriage member 23, so follower stud 43 is free to slide axially on the cam periphery during any carriage adjust- Y ment without affecting the angular positionA of,

rocker arm 4i). Means is provided to cause the rocker arm ,43 and its cam follower stud 43 to* follow the eccentric cam 42. The means for this purpose comprises a longitudinally disposed, endwise open housing member 44 which is provided in connection with the upper part of the carriage member 23 of the tail stock structure. Fixed in Y connection with and so as to extend through said housingmember 44 is a barrel45 having a rear--` wardly open bore 46 and a forward end wall 4l.

Slida-.blyrmovable in'said bore 43 is a thrust pin Y serves as guiding means for spring 53 and limits outward thrustv ofthrustpin 48. Engaged betweenthe end wall 4l of the barrel 45 and the inner end of the thrust pin 48 isa compression spring 50. Said compression spring 50 yieldably urgesy the thrust pin 3B against the rfixed end of the rocker arm 40, whereby to swing the tail stock frame in Vclockwise direction, and thus the free end of the rocker arm 40 with its cam follower stud 43 downwardly, to cause the latter to maintain contact with the surface ofthe eccentric cam 42. i l Means is provided for yieldably inducing-a down swinging movement of the bearing member and the spindle 34 and lapping tool or pin 36 which is supported by said bearing member 30, whereby to produce a constant bearing contact or thrust of the operative end portion of the .lapping tool or pin 36 againstthe surface of the die I5 under regulatable tension, while said'tool' or pin'is rotated andrreciprocated by the cam actuated movement of the tail stock frame. The means for causing the lapping tool or pin to tensionally bear against the surface of the die under treatment comprises a pull spring 5LY the lower end of which is anchored to the carrier member 23. Aixed to the bearing member 30, forwardly of its pivotalconnection with the tall stock/"frame, is a laterally projecting bracket 52 which vis provided withl a slottedvorfbifurca'te free end portion. Connected with the upper end of the pull spring 5I is a screw-threaded coupler element 53, which is disposed to extend upwardly through the slotted or bifurcate free end portion of the bracket 52. Threaded onto the free end portion of the coupler element 53 is an adjusting nutV54-which bears upon the upper face of said bracket 52. It will be obvious that by turning the adjusting nut 54 in proper direction, the down pulling tension of the pull spring 5I may be op- 4 tionally increased or decreased, whereby to regulate the degree of tensional down thrust force by which the lapping tool or pin 33 is caused to bear upon the surface of the die I5 under treatment thereby. Preparatory to operation of the machine, the spindle 34 is longitudinally adjusted and so fixed to its driving shaft 33 as to operatively enter and engage the lapping tool or pin 36 in the aperture ofthe die I5, the surface of which is desired to be polished or lapped.

In the operation of the machine, when power is'applied to the pulley I8, the head stock spindle I3 and collet I4 are rotated so as to rotate the die I5 which is affixed to the collet. Power is trans- Amitted from the head stock spindle I3, by the pulleyland beltV transmission I9, 22 and 2 I to the countershaft 23.Y Power is transmitted from the countershaft 2B, by the pulley and belt transmission 31, 33 and 3S, to the spindle driving shaft 33 of the tail stock structure, whereby thespindler34 and lapping tool or pin 36 is rotated. Also the countershaft 2li rotates the eccentric cam 42.

The rotated eccentric cam 42 operating.-.upon the rocker arm 49, in conjunction with thespring actuated thrust pin 48, produces back andforth oscillation of the tail stock frame, whereby the bearing member 38 is longitudinally reciprocated, together withV the rotated spindle 34 and lapping tool or pin'33, relative to the rotated die I5: Due'v to this, the contactingsurfaces of the vlapping tool or pin 36land the die aperture are not only rela- Y toY the rotated and Yreciprocated lapping tool or pin 36. relative tothe die aperture surface, not only is the former maintained in constant rub-i` bing contact with the latter, but at the same' time subject to ardesired selected degree of rubbing pressure. l Since the tension of downward thrust of the lapping tool or pin is subject to reg-v ulation, by adjustment of the tension Vlof pull spring 5I, the bearing pressure .ofn said tool or pin upon the die aperture surface 'can'be effecv tively maintained at the desired selective amount of pressure force Vfound to be of best advantage for accomplishment of the polishing or lapping operation. y

From the above it will be understood that aL very` efficient means is provided for relatively moving the mutually engaged surfaces of a lap-l ping toolfor pin and the work both rotatively and reciprocably, while at the same time assuring both constant engagement Vof-said surfaces without interruption or chattering as well as with a Y desired degree of rubbing pressure.

Having now describedY my invention, I claim l. In a polishingror `lapping Vmachine of the kind described having a head stock provided with means for rotating the work and a driven countershaft, a tail stock.structure'coinprising a carn riage member mounted for manual sliding ad# justment substantially parallel to the axis of said work rotating means, securing means for saidcarriage member, a tail stock frame pivotally sup-l ported by said carriage member for oscillation on an axis substantially perpendicular to the direction of carriage member adjustment, said tail stock frame having a rocker arm, a lcarndriven` by said coimtershaftoperative upon thel'rocker arm to oscillate said tail stock frame, sprir`1g`a izuir ated means urging said rocker arm in 'following relation to said cam, a bearing member pivotally supported by said tail stock frame on an axis substantially parallel to the pivotal axis of said tail stock Trame, a spindle driving shaft journaled in said bearing member on an axis substantially perpendicular to the pivotal axis of said bearing member, countershaft driven transmission means for rotating said spindle driving shaft, a spindle extending from and driven by said driving shaft, means for coupling a lapping tool to saidV spindle, and spring means cooperative with said bearing member, said spring means being adapted'l to down swing said bearing member, spindle. and lapping tool whereby to effect rubbing pressure of the latter upon the work.

2. In a polishing or lapping machine as defined in claim l, the construction and arrangement of parts, wherein the cam for oscillating the tail stock frame is rotatable on an axis substantially parallel to the direction of adjustment of the carriage member and has an axially wide peripheral face which may be traversed axially by the rocker arm in its following relation to said cam during Aadjustment of the carriage member.

3. In a polishing or lapping machine as dei-ined in claim 1, the construction and arrangement of the cam follower means, wherein a screw threaded follower stud is adjustably engaged with the rocker arm of the tail stock framev for movement toward and away from -the countershaft driven cam to permit predetermination of the limit of the backstroke of the said tail stock frame.

4. In a polishing or lapping machine as dened in claim 1, the construction and arrangement of parts, wherein the work rotating means and countershaft are disposed with their rotational axes substantially horizontal and' in the same Vertical plane, and wherein the countershaft driven means for rotating the spindle driving shaft comprising a driving pulley aflixed to the countershaft, a driven pulley axed to the outer end of the spindle driving shaft, and a belt connecting both of said pulleys for power transmission and to` counterbalance the weight of the inner end portion of the bearing member and supported parts.

JOHN GORDON KAVENY.

REFERENCES CITED The following references are of record in the iile of this patent:

UNITED STATES PATENTS FOREIGN PATENTS Country Date Great Britain Apr. 25, 1918 Number Number

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