US1149226A - Stripper for punch-machines. - Google Patents

Description

F. A. STEVENSON.

STRIPPER FOR PUNCH MACHINES.

APPLICATION FILED FEE. I0, 1914. 1,149,226. Patented Aug. 10,1915.

2 SHEETS-SHEET l.

INVENTOR.

A TTORNE Y coLumBlA PLANOGRAPH co4, WASHINGTON, D. c.

F. A. STEVENSON.

STRIPPER FOR PUNCH MACHINES.

APPLICATION FILED FEB. I0, |914.

Patented Aug. 10, 1915.

2 SHEETS-SHEET 2.

KfW-1,5 @A f PT* "71 T* l* I I I I IL N. ATTORNEY WITNESSES coLUMBlA PLANOURAPH CO. WASHINGTON D c 1Fitiiiiinmoir lA. sTEvfENsoNQgoi-e nnmnoii, y t l p n firm Fouiinmz COMPANY, or ysm.toms',iiiissoiint,liihomogenen;,oii New JERSEY. i

ritieieee.

clear, and eX'aet fdescriptionysueltas ill enable' others skilled'inttlie"arpt'toiwvliie i it j appei'taiiisfto ineke andtous'e" thefsa'ineij'ei'-1 ei'ence being had to the accoiii anyin'gdiraww ings, which ilii'istiate the preleiredfoijn'ifof as it is obvious/that" variousiinodic'ations' thereof Willocciir to *persons skillediiilthe Hart. l :w

V being locked i'iijits vif'oilriholdingvpositien f `during the punchingoperations,y Vfand, Yuntil `*i'iisaid drawings, Figure l`v Iisgafroiit"relevatioii et' a multiple punch vvith strippers forming the subjeet-inat'ter of this invention applied thereto. ."Figllisahorizoiitalt section along' the li'ne/Q--Qo'iiFigf 1I i Fig. 3 isa vertical transverse lseetioii *alongi the f line 33 of Fig. l. Fig. :45 is a plan "view of a stripperhookA hereinafter" described,

auditie. 5 is a section thereoftakenfon linej -'jo'c'fFigeL n n t n My gpresent invention relates tol strippers toi"L punching inachinesyand has `toi one ot its yprincipal purposes the applieatioii'of aA device of this;oharaotervfhiehis capablejof the stripping'y of the W'orkfroni the jpuiiehes has been accomplished during 4 the vreturn vfor upward stroke vot saidpun'ohes. Iiiirthjen` more', the design is suiehas'toprovidean initial kick-`77 asthe punches are about tto befivithdraivn from the worlrfthusjovercoming Whatever friction is" present "betwtfeen the i sides of tliekneivlyy made'flioleSi-i'iid'the 4roonsuoli holess Theproinpt, positive aiidfaiitoniatie `release of "theu's'tiipper 'after the puneliing land `'Stiiippingr foperatioiis," have been performed, Vand its yimmediate return l other hi ghlv desirable end yla-'ttaiiiedil in the #Miei/item@ Assieivoit irofiiiviERA-VICAN `CAR rsiiiiiiffmoii "removal of j the stripper ""vhen has i pera4 foiinedgits functions --`3Moreover,f theeonf' ystruction of )this fdev'ice' lsiiiiple and 4,rugged with` a 'minimized opportunity fr getting out `foi-de1gy Y t l 'In saidl drawingsjfa-l he'ag'dspositionedin vordinary' e slotst.`v j

f CPositioiied' above the die p'iineliing"machinesj'"l y y i Dies l2 'for' the punches 9 aie so seated Vin AVdie block; 2 "asf tof receive their respective -*punehes when' theflatter are carrie'dfdown by *the slide 11.

ltheparts"just aftertlie slide hasoaused the f vpunchesto/travel doivnt'vaidly and perforate fthe Worin which, intthis case,Y is' 'shown' to be The -"drawingsillustrate 'the ypositions `of v yaf'slieetot commercially "'i'oiled'fplate 13.. y

Before' the doivnivai'dstrokeof the slide ,l1 4

t into Qthe'space fbetiteen' lthe top t of thev rdie t "block pf'and'the underside'of thefstiipper le, fsaidfplate "contacting With positioniiigi pinsl .i

"'15 and re'st'iiipjoiittop` oi the diebloclr prop? geilyf'lociitetlto be operated upon.` In Fig. 2

fihefpiet'@ is 'Shownfinpifemy dotted lines Afto iiioi'e "readily distingiiish t itfjand the punches@ are seen to be' distributed so esto produce` holes desired points throughout f its area.' Any '/otheuairaiigleinent'ioiithe punches and their diesteanjoteourse,be Amade to suit the requirements"Jfthe'vvork inhaiid.'y 4 "i `I The variousigiiresshoiv the' plate'13l as having` been perforated, j the pun'cl'ies 'haviiigi` passed i through fap"ertures'y "in" the stripandisfitself looked in poysitionjt y ,n i

The ystripper is ofi sii'ticientieight to i y V1,149,226

Y rmaintain the work in its proper position, but

l5 'wthe die block 2, and to withdraw from theV V pockets 18, permitting stripper 14 to be lift-'f ed by reason ofthe upward travel ofthe slide l1. The stripper hooks are-in the form" of bell crank levers, possessingshort arms v19 toguard` againstdisplacement of said stripper it is locked to the bodyV of the punch through the medium ofstripper hooks 16,

the lower hook ends 17 of which, during the 'punching operations, occupypockets 18,

whichare formed by recesses 'in that part of the 'punch body 1 upon which the die block. vr2 rests, in proximity tothe four corners of" said die block, andfbythose parts of the die block Y2 whichvoverhang the. recesses in the punch body. vAfter the perforating of the f v plate 13 and the'stripping of it from the punches,the stripper hooks 16 arecaused to f disengage themselves y'from the underside of that are perpendicular lto the longarms I which'carry hookends 17.` Theunder surfaces ofthe short arms 19 contain arcuated 'bearing bosses 20 against whichat certain` times bear 'the' upper lsurfaces `of the headsV t u 21of stripper bolts y22,vk as" will be hereinafter more fully set forth. Short arms 19 'also' contain holes 23 ofk peculiar formation .e

-throughpwhichfpass Vthe stripper bolts22`. These holes 'are of that shape `which' would beffgenerated by rocking a VVcylinder' yon its .-base'in a vrstraight line from avertical posi- -tion to aninclined one; The aperturek thus produced permits the rotation of each stripper hook 16y about its pivotal `point,which,A in the case oftheV aperture having the formk fof an ordinary' cylindrical hole, would-be prevented by the stripper bolt 22 passing Vthrough-fthe short arm 19. ln'any ofthe inclined positions assumed .by the short arms 19 the curved outlines of'protuberances 20 present yuniform Acontacting points for the heads '21 of the strippery bolts, whenever the f i latter are caused to engage the short arms 19.

Detents 24 project .inwardly and slightly v*upwardly from the top of stripper hooks 16. yThey are intended to limitfthe Voutward movement ofthe stripper hooks as they are being disengaged from the locking position, and also to cause the short arms 19Jof the.

v stripper hooks to virtually become rigid eX- tensions from the stripper14, whereby the latter'may be lifted,k to itsuppermost position when ythe stripper bolt heads 21k yare in engagement with thev protuberances 20v'on the underside of the short arms 19, and the stripper bolts 22 are being carried upwardly l bythe slide 11.,V

Stripper hooks 16 are provided at their upper ends v'withpivot holesV 25,k whereby` theyy are suspended V from pivot pins 26, the

latter passing also through andbeing sup- Y ported `bylugs 27 projectingfrom each cor- Vner of the stripper 14. yNuts are applied to the threaded ends Vof thepivot pins 26, but

teclear the, dieblock 2 and body 1 in their."

are not tightened sufcientlyto interfere with hingey action Abetween thelugs 27 and the stripper hooks 16.

kStripper boltsV 22, extending through they short arms 19,-'are secured by nuts 'to brack-gvo ets '28, Vwhich inV turnare bolted vtoifthe f not shown but wellknown the art, the

slide`11 is caused to move downwardly, carrying with it thepunches 9. At the begin-V ning ofthe downward stroke ofthe slide 11,

the bearing bosses 20 rest `upon theupper surfaceof thestripper bolt heads 21. Q Gravf l i ity causes they stripper 1 4 toyassumethe low` i est position v'that detents 24 and thesides A Theinclinedjpositions'of said shortarmsat this time cause the long arms with hook ends Y 17 to proj ectr outwardly far' enough for them f downward travel. This position is indicated at a in Vdash lines. VWhen the lower surface of the stripper 14 reachesthe upper surface of the plate 13, the .stripper holds i the plate firmly in-placeand the pivot pins 1906 26 become stationary pivotal points about which the stripper hooks swing inwardly until the stripper hook ends 17 occupy the pockets18 in the body 1, and are hooked un-y der the die block 2. If any of the stripper hooks 16 stick, so that the preponderance of weight, which is distributed outwardly lfrom their pivotal points, fails to causethemto *swing* into thel pockets 18, the continued downward movement oftheL slide 11,; and

therefore, the stripper bolts 22 will fresult lin theY stripper boltl heads 21 striking thelong armsof such stripper hooksz16, automati cally forcing them into the4 locking position,

.e., into saidv pockets 18. This continued ll vdownward movement of the slide v11 alsoy carries the punches 9 Athrough V apertures in l stripper 14, the plate 13 and into the dies12,f i

The returnorupward stroke of the slide 11 now begins and upon the upwardy movement of ythe punches 9 vthere is a tendency for the plate 13k to rise ywith said punches, dueto the friction between the punches and the walls n of the holes they have created. Any-i such lifting Yaction onthepart ofthe plate ,will be abruptly arrested by the tops of thestripy per hook gends 17 yencountering the under side of thefdie block 2, thus bringingwhat Y, ever slight upward movement theremay be of the stripper 14k to a jolting stop.V The `130 so I' Aof holes-23 inthe shortarms 1'9 willfpermit.

` iglesias@ 1 *a l punches meantime vcontinue 'i theiliiA 'upward uppei surfaces of i the stripper bolt heads yE21y have come rinto contact with "thefpi-otuberances on theuinder sidef'of thelslioitai'his 19 of the stripperfl'i'olis l'faiidsaid stripperihoks rotate about the y p Ward tiayel Y of ment in Shen musi@ Cabout piiotfpins `2o. The 'stripper hook ends ijif Lmove Inovethe detents Q4 coming into "engagement 'with the upper suiliace 'of the stiippei 14. a This position of t'hepats is'fshotvn ldota'nd dash lines at `b,`an"d said pai't's fate` held in the saine relationship "as the stripper 14 and t' the stfipper; hooks" io are earned byjthe strippieiebeit heads 21j toi-the dash use position Shown a, w'vhc'h fis the Santing point and', hence, tthel cycle yof "operation's` is coni-` *pletel5 and after 4the plate 13 i-'enioved,

anotheil y'such yplate may "be 'iifiseited and "oprated upon inthe'f's'aine mannen."

punches 'tlieetli'1ou'5gh-,' attachment inembeis on said stiifppei and position-changing and suppoitlngineans connected to ysaid 'attachf` @j adapted to be actuated by saidfslide;

2. ln a multiple punch having 7arche-,oar- 'rying 'die block and punches fcaiji'iedfby 'f a reo'ipiocatory slide, fa lockable *stripper perit'oiated for `-thepassage 'saidv punches,` integi'allilg'son said s'tiip'pei, andfnielanscariied by said lugs adapted in one position toev lock "said stippei" inta `-Work#holding' position.

rying die block and i punches fcairied j by a re cipi'ocatoiy slide,y a rYlo'cliabl'e fstiippei" pei'- oiated" 'for the pas'sage of `said g punches,l inte'gial lugs on 'said strippen, stripper fhooks pivoted to saidv lugs and 'adapted'in- 'one lpositiony to engagefsad 'die block ytolock saidl stripper in a Woik-holding f po's'itiomf and to:

impart a punch-freeing [kick to the Woik through said stripper. i

4. In 'al 'multiple *punchhaving aydie blocll and a iecipi'ocatory punch-carryingfslide, a y

- ingfdie block secured toV body lianie and lockable stripper, in'tegia'l lugs thereon7 a plurality of stripper hooks piyotallyut f'tached to said lugs,I each hool comprising a locking zneinbeif,` yan 'unlocking ineinbei and a throw-limiting device `fo: said hook, said l es' unlocking "nfi'einberf and throw-limiting "de-` vice coactiiig in certain positions to connect changing nieans;

ippei': toj'suppoiting 'and positionfa'pliirality of stripper 'hooks pivotally attached to said lugs, each hook vcoinpi'ising" a y lockingaiin with a `hooledfend adapted to engage 'saidfdie block, anunlocking arm and f ysti-ipper#engagi'ng "detent',` co-acting at 'IiieSiVith said 'lilnlo'cliing aiin to holdsaid stripperfinsuspension-l; I

- on in a aaiiupie paneahavihg digfbiok and a iecipiocatoiy p'unoh'cariying slide', a g lockablesti'ippei7 a plurality "of stippel-` Q/liools'piyotally Connected to said stripper, y"each hook coinpifising a 'stripper-engaging `"detent, a looking aun andan unlocking arm, Ja'cuated ybearing bosses-fon said unlocking i erin, 'a'nd''a position-adaptingaperture there!` i`n-, headed inean's passingthi'ough said ape'rfj 5'.y In a v'niultiple punch haying "a L die-block fand a ifeciprocatory pun'chc'aiifying slide, a lockablesti'ippeig integral lugstheieorn` and,r4

sof

ture, joapablel ofcali'ying eachlocking aim Y "toits locking position, and of engaging said "beating bosses to unlock said stripper kand to icaus'efsaid detent to 3o-act `With said headed means andy said unlocking aiin to xi'aise andlowe'i' said stripper.

. In alinultiple punch having a die-carryingdie block secured to a body `i'ia'nneand i"punches carried by a iecipiocatoiyslide'a lockable stripper apeituied lion the passage y f punches therethrough, a pluralityof stripper hooks, suppoi'tingineans therefor fc'ai'iied 4by rsaid stripper, each stiippei hook being adapted 1n vone position yto engage said block `to'flocl; said stijippei thereto, and tol inipat a punchglii-eeingkick through said stripper y'to rsaid Work, and a plurality of *headed stip'pei bolts Lnormally holding said 'fstiuppenin suspension, but adapted to be actuated yby "the movement in one direction of'saiid 'slide to lower said stripper and to force said stripper` hooks intol locking post tions,r rand upon a reif'eisal of such Inove` ment to unlock said stripper hooks and toV` i y j-etuinsaidstrippei' to itsnoiinalposition.

*8; In a gi'niiltiple punch'hayingfa diefoai'iyiii'g 'die-block seciii-edygtofa' "bodyfraine and punches "caiified it Tecipiocatoiy slide, a js'stiixiipeif ad ptedto holdivork inplace upon said die bloel-by its Weight, means carried ""byjsaid stiipper i'or locking the latter inav 4v""itfto release said Work.

9;'ln aniultiple punch having a die-caiiiyy"punchesV carried by a i'ecipi'ocatoi'y slide,' a

lockable stripper adapted to'ietain Work in placeiipon said die block, a pluiality of inpiotally secured to each lug,^sa1d stripper "hooks being vaiduf'ipted to lock said-strippen isoL y tosaid die block during punching and strip? ping operations and to cause said workfto bestripped from saidpunches by imparting a kick to--saird stripper, and means carried Aby said slidefor rotating said stripper hooks' to unlocksa'id stripper from said diesblock 7 and to raise it fromfsaid work.

` ally affixed to each lug, each stripper .hook

` 10. In a multiple punch having a die-.carryto holdia piece ofworlr, locking means carried by Ysaidstripper adapted to lock` the l latter to said die-bloclr during punching and stripping operations, said supporting means t upon' theascent of said slide and after said operations'actuating said locking means to release said stripper from saiddie block and to raise it toits normal vupper position).

11. In amultiple punch having a die-carrying die block secured to a body frame and p punches carried by V'a reciprocatory slide, a

lockable stripper apertured for thepassage f of said punches therethrough, a Vpluralityof integral lugs thereon, a ,stripper hook pivot comprising along arm with a hook end, an

integral short arm angularly disposed there-V toand having an aperture therein and arcuatedbearing bosses, and an integral stripperengaging detent, a plurality ofv headed stripperbolts, each secured-to said slide and passing through one of said short arm apertures, whereby said stripper is, normally suspended from the heads of said stripper bolts through said short Varms and stripper detents of said stripperihooks, said vhooked long arms beingheld in a` disengaging positionY but adapted upon the descent of said slide, stripper and stripper bolts to swing their hook ends under said die block to lock` said stripper thereto.

l12'.V In a ,multiple punchV Ahaving a die- I carrying die block secured to a-body frame and punches carriedpby a reciprocatory slide,Y a lockable stripper. apertured forY the passage ofk said punches therethrough, a plurality ofk integral lugsthereon, a stripper hook pivotally aiiixed to each lugV each stripper hook'comprising a long arm' with y a hoolrend, an integral shortA arm angularly disposed thereto and having an aperture therein and an integral stripper-engaging detent, a' plurality of headed stripper bolts, each secured toy said slide and vpassing -through one of said short armyapertures,

whereby said stripper is 'normally held in suspension, and upon the descent of said slide rests upon and holds workin place, said hooked long arms vswinging beneath said die `block to lock said stripper thereto `and upon the ascent of said slidensaid stripper hooks lbeing-caused to impart-a punch` freeing kick through .said stripper to said gagernent of, said stripperhooks and die block and through jtheagency of, said short said strippertoY arms and detentsjto return its normal position.

13. In a multiple punch work, lthe heads of said stripperbolts engaging said vbearing bosses to cause the disen having a die-carrying die blocksecured to aybody frame and;v

punches carried by a reciprocatory slide, a'` y' a lockabler stripper adapted to retain Work in y,

place .upon said die block, a plurality of i11-l tegral lugs on said stripper, lastripper hook pi'votally secured .to eachl lug, said stripper hooks being adapted to lock sa'idfstripper v tosaid Vdievblock duringpunching and strip'-y ping 1operations, each stripper hookVr comprising a long hoolrarm, a stripper engagingl detent and an integral short arm anguture therein,said'` aperture beingy ofa form toperinit the automatic adjustment without disengagement of vsaid stripperhoolr short` larm and a `stripper bolt passing there-y through, each stripper bolt being'suspended from saidY slide and adapted to engageits respectiveshort arm and rotate Ythe same to unlock said stripper ,hook Yfrom said dic block, andtoreturn said'A 'stripper to its y upper position.

V14.V` In combination ina punching machine, a movable member, a ,punch carried thereby, a stationary die-carrying member,

astripper interposed between both members anilmeans forfcarrying said stripper into and?" out of a work-holdingv position and 'in (the latter position-.locking it to said stationary member. l Y

15. In ycombination in a punching machine, suitably'mounted die-carrying dieblock, a reciprocatory punch-carrying slide, a. stripper lperforated for punch-passage, stripperfcarrying lmeans secured to Y said slide and means adapted at .-timeslto cause saidstripper-carrying means and stripper to move synchronously and at other times to Y loclr'said stripper to said die-block.`

16; In{ combination in -apunchingv ina-j chi-ne, a stationary die-block,a punch-carry ingV slide, a 'stripper perforated for Vpunchpassage, `stripperfcarrying y means movable withl said'slide and devicesadapted to clutch said stripper-and its Vcarrying' means vduring ypart-ofthe movements of the latter'and to effect a release therebetween and a locking of said stripper to said die-block during the release. interval. y

17. In combinationin a punching mwa-l chine, va stationary diefbloclr, a punch-carrying reciprocatory slide, 4stripper-carrying v meansdepending therefrom, a stripper and cause said stripperecarryingkmeans to lower the `stripper to retain work by its lweight .85` l larly disposed thereto. and having anaper devices .carriedby said stripperadaptedto iso stripper chine7 a stationary die-bloclngaJ punch-.carryi mg reciprocatory slide, stripper-carrying i means `depending therei'romra stripper and devices carried by said stripper adapted to i cause said stripper-carrying means to lovver the 4stripper to retain Work` by its kWeight` andaiso to reiease the stripperfrom said strippencarrying means and to lock it inits Work-retaining position, said stripper-carrying means being adapted to force said devices into stripper-locking positions. n

, 19. In combination in a punching machine7 a die-block secured to a frame, a punch-carrying reciprocatory slide, strippercarrying means depending therefrom, a and locking devices pivotally mounted on said stripper, each comprising a member' for locking said stripper to the diebloclr and other members inoperatively `connecting said stripper and its carrying-means Copies of this ypettentmey be obtained for While the stripper and die-block arev` in,y locked relation and rigidly connecting them at other times to move said stripper.

20,` In combination in a punching machine, a stationary die-bloclnva punch-carry-y ing slide, stripper-carrying members depending therefrom, a stripper and devices pivotally `mounted on said strippereach comprising a member adapted to lock the stripper toisaid die-block and other `members for releasing and locking together said.

strippers and its carrying members when said stripper is locked or released from said die-block, respectively, one of the latter members having an aperture therein for the passage of one of said carrying-members, said aperture having a form permitting the device containing it to turn. I

In Witness whereof I have hereunto set my hand in the presence of; two Witnesses. FREDERICK A. STEVENSON. Witnesses: l

ELIOT W. STUDER, ARNOLD L. PLPPER.

vecentsV each, byaddressing the Commissioner of Patents, Washington, D. C. 1 f

Images