US1797239A - Protecting device for stamping presses - Google Patents

Description

March 24, NEWMAN PROTECTING DEVICE FOR STAMPING PRESSES filed June 5, 1929 3 Sheets-Sheet l 9 INVENTOR I ATTORNEY E March 24, 1931. NEWMAN 1,797,239

PROTECTING DEVICE FOR STAMPING PRESSES Filed June 5, 1929 3 Sheets-Sheet 2 :1 4 o ML 29 3 I 70 4 v I A NI III}! 3y 2 INVENTOR W///Z/ //4%J//W2 March 24, 1931. NEWMAN 1,797,239

PROTECTING DEVICE FOR STAMPING PRESSES Filed June 5, 1929 3 Sheets-Sheet 3 2.9 67 J2 m {3J9 ATTORNEY branches of the'invention 'are for, the purpose Patented Mar, 24, 1931 Y Q NEWMAN, 1 wieekif -xi 1 'rnohincrme nnv cnnonstmimrrne'rn issnsc ff i Applicationffiletl Jun-e 5,

' My invention relates to. devices for protectingioperatoi's offmachines such as, for in stance; stamping presses, against in] ury. The invention; embodies two principal features,

' l on'eof which is-a device for automatically ejecting the work from the machine aj tter the Y stamping, blanking or :other operation has been performed by the machine -"inorder that v the o'perator will not have to insert the hand 1 0mm position'where -'it might be injured by the diesor othermoving parts'oi the machine it the saine'fshould unintentionally ,beoperated: before thehands are withdrawni This branch of my invent-ionalso embodies-a sim- -ple: 'an'd1 automatici means ,for ejecting: the

work so that the'hand of the operator does not have tozv be used in removing the work f-ro'mthe machineafter the material hasbeen acted; upon. Y The, other branch of theinven+ I e-0n embodies a device in the form of a movable guard which will strike the" hand. or

Y hands of the operator duringthe active stroke a of themachine if the; operator failsto withdrawhis or her hands from the;danger point.

' 2'5This brancht ofethe device, therefore, is in tended to permit the operator to move the ma-z terial'inthe feeding position onthe machine and when this has been accomplished and the ymachine makes its active. stroke, if the op- 0 erator should' failflto withdraw his or her" hands toa safe position-, the guard willcome in contactwith; the hand or. hands @of the operator thereby warning of; the danger'f or even physically jmovingi the hands out, of danger! he gu i amo abl p ttoper e t tomati'c'ally 'in' conj unction with "the machine and it remainsjin positionwhere it will not.

interfere withithe; hand ee1in o{ the mai .terial intoEtlie die of the machinelz Both 7 ofavoidingjinjurylt'o thedperator of the me:

able; or-f'movabl'e andstationary parts co-op? crate to forcibly'act upon stock which'is fed by hand to themaQhine. i Y Another 1 obj ect of the" inventionis to 'pro-' vide protective'devices embodyinglboth of the features above described, which will be adaptable to f-thesame. machine and which chine such 'a's a stam Y in res s where Y mov: c 7 h 7 p v, or

ieaa fsriai not 368,710.

not-interfere in their operation. onelwith 1 the'otherynor with the operation of theme chineitsel'f, and which will not interfere with the feeding ofthe'stock into the machine;

While" the present inventionmay beem plo'yedin-lconjunction with various types of machines; such as stamping presses, in which stamping; uforming, closing; riveting and other operations may be performedfthe same may be'used inconjunction with various 0 other types of-machines where material is'fed byihandandrwherethe operator is '-liable-' to be injured-by parts of:themachinefifagth handsareinot removed asa'fe distance. I Y In thedrawings forming part of this ap-; p i i 55., -V 3 v u 3 Figure 1: is'fa stamping; press to which my invention has vbeenappliedf YT n Y 1' Figure'-2 is a frOnt' eIevatiOn of the upper portionofthe sam'e,sx f, p Figure 3 is a sectional view taken on'the line 33 of Figure 2,

-' Figure 4e is Y an enlarged elevation portionof the stamping press 'togetherf'with the?protectivedevicese r j Figure 5 is a similar; View but with' som'e parts shown in section andshowingfthe eject ing device cat 3 about the completion For: -:the i ejecting operation c y p a Y "Figur'egfi is -a sectional'view. taken onithe line 6 6' ofFigur 4 1 v I Y ig 7 is a sectional view taken on the;

line? of Figure FigureS is a sectionalviewtaken ori thev Q Figure" 9' a a re p ctive View "of a group.

of members ifo'i ming-part-of the ejecting ide vice; V w i 1 5 I:

it In: have shown 1 my invention applied to a foot power 'stampingipiess although it is to be understood that the same. may b'e' applied of: machines other; than stampingi "presses;

part table portion 2 from" which extendswhich l the. movable parts of the stamping de- 1 a .7 001',- V1 6 arem unted; 1 There 1s a long; curved side elevation of a foot power to a power driven m'a chiner as well astoztypes- Q In the drawings "If'have shown afmachine E f: mounted on: standards *1 an d comprising: in 1 l lever 4 pivoted in this upper frame on the shaft 5 and the lower, curved'end of this lever is provided with a treadle portion 6 on which c which engages the slide 8 of the plunger S0 7 the operator places his or her foot to operate the lever for driving the plunger of the press.- The plunger 7 of the press is provided with a dovetail slide portion 8 which travels in i a corresponding groove 9 in the frame 3; and

in avertical direction. One arm lOof the operating lever 4 is provided with a roller 11 that when the lever l is rocked, the plunger will move vertically toward and'from thebed of the machine. V

' The lower end ofthe' clamp 12 which holds theupper die'm'ember 13'which is to co-operate with the lower die member '14 in the bedof the machine for 1 formed; as wuss tomove the operators hand formingor shaping apiece of metal. The metal is fedacross'the'die 14? by the operator to a. position against a gauge in order to be gct'ed'upon by-the upper and-lowerdie mem G'I'S. 3

The obj ect' 0i? the present invention is to eject the stock-from the" lower dieafter the stamping or other operation-has beenzrperaway from the dies. Onthe'upright frame member 3-Iof the machine thereis'molinted a bracket 15 by means of the bolts 16=and one arm" 17 of this bracket 'proj'ects'from one side of the machine and supports the pin 18"0'11 which the lever 19 is pivoted. The upper-arm.

20* of this lever drawn'in one direction by the coiled spring 21,'one endof' whichis at tached tothe lever arInEZO'and the other to a fixed holder 22. There is anarmQZK 'eXtending laterally from'mthi s lever and it' is provided'with a roller 24 which is adapted to engage the top surfaceof aplate 25-which-is secured-tothe slideblock 8*of the plunger of the'inachine by' means of the bolts26 which screw intothe slide block and pass through the vertical slots 27 of the-plate .By'means of these-bolts and'the'slot ted apertures 27 the vertical position of the Fplate QS may be ad justed inrelation. toathe plunger of thednachine for a purpose whiclr willl he set forth hereinafter. o v

The ejector rod 28 is movable laterally of the lower'l die'm emherl lzandin the particular Where the die'has'a-slot extending through i it'as illustrated herein the ejector slide can move in this' slot of the die but-in otherc'ases instance illustrated'zlherein this rod slides through a channel 29] in the diememben: al

though the particular relation of this ejector to tlie 1die=-will depend partly on the character of-the-tdies.

git-'may be necessary to slideover theface-oi the di'e'lt' and it will be apparent-that modifications'in the ejector will'be'mad'e' according t tothecharacter 'of the die and'the'particular article to be handled it. The ejector rod plunger, which is shown as round;' s provided with a chuck or 28 is shown as rectangular in cross section and itis shown as sliding through arectangular opening 30 in a. guide plate 31 mounted on the frame behind the lower die 14. It will be understood that if the cross sectional shape of the ejector 28 is changed the opening 30 in the plate 31 will be correspondingly changed. There is aplate32 fixedlt'o the machine and projecting to the right in Figures 6 and 7 of the drawings; and this plate has a lateral projection 33*which is also provided with a guide aperture through which the rearend oftlie'ejector r0d28 moves. Thereis a latch or trigger 3Lwhich is U shaped in cross section and which is pivoted to the ejector rod by means ot the pin 35=which may be placed in any one'of-the severalapertures 360i the ejector rod 28 for adjustingithe position of the latch ontheejector rodi This latchhas the top of the rod 281 The lower ends of the arms" 39 are connected byacross pin 40 1 to whichoneendof'a coiledsprihg-llSCOIlf nfected, the other end o1?t-his-sp'ringibeingcon nected' to a bracket 42*attaohed to the lateral extensionsaof the plate' 32;

The'l'o'wer arm of the lever a1'in'43 is pro vided w' ith a" shoe 44 adaptedto engage the end of-thelatch 34'; ahd 'this s'hoe" is formed 52 the other end oftli'e spring heing'att'ach'ed to a stationary'pih-os Ontheiplate 48." The ews 5 1 f e e has; c re-rep surfaces?) whi 'his engai edjby' a roller 56' mounted one plate- 57 whiohis amnes a the slide of the plungerofthe-press by'xneans of; the screws 58: which I engage through I the elongatedslots 59 of the plate These screws an d slot s permit a limited vertical adjustment olf the plat efia on i the plunger slide for the purpose-0t varyin g'the time of operation ofthe lever tioto correspond with the time of operation of the plunger upontho work. There is anaarni- 60 forming acontinuation of the-armed but arranged atan anglethereto and the lofwer'end of this arm formsa strikingp'ortionadapted' to* sweep across the front? of the space between the upper and-lower diemembers of the machine for the purpose ofpushingt-he'hand orhands downwardly extending portions 37 which straddl'e't'h'e ejector rodgth'e downward ni'oveme'nt of one-end of the latch being limited by the engagement; of the cross portion 38 with I ofthe operator away from the dang er point.

' WWW I 1 the feed a s piece (of stock ,across, the lower die member 14 to a suitable-gaugewhile the parts of the machine arev the position shownin Figure 2, atwhich time the striking member :60 is.;.at the. left tolervegthe space iirfr'ont-of .the

dis f ree. forthe, operator I to feed. the stock,

' Assuming the stock has. been fed in the p0 sition over the lower diimember and under the. path of, the upper die-member, the op-s erator will operate.,the[tread le 6 to forcethe plunger ofthe machine downwardly so. that the diememherswfll operate on the stock which has heenfgedfto them. \Asthe, treadle plunger vofthe press moves dowrrwardlyit carries. the'plate 57 on, which ".th eTroIler 56 is mounted and this roller will action the curvedsurface 55 to swing the lever- 50onits pivot 49;, Sothat the striking member 60 sweeps across in front of the die members to move the. hand of the operator vaway from the'danger point f t'hasnot. been previously removed. If the operator thereforeshould for any reason' ,fail towithdrawthe hand or handsa s,afelfd i,S,t; 1ce ffr'om'the dies; the hand or hands? will be forcibly movedfto prevent their being. injured by the descending the The striker ..,membie r$ 60 wil].;:not interfere 'wit hfthe] operators holding'jthe 'front edge a r or the stock up to the timegthe material is .ac'te'd'upon bythe dies. sothat the opera-tor;

hold the stock; against the' gaugeifrom' I the front edge of the: stock: The striker meinher makes one sweep or movement 7 from leftto right,as'sl1own in Figures 4 and elf Qf ie p s -Ti 1 During the upwardor retur nfstroke of 5iduring one downward strollze of the plunge thephing r' the mile 56 P ,0.t0,.,befswunsthe lever the initial or starting pos. sue ds'epe a i n i v gern in'theoperationfjustdescribed,the page 25fwhich isacarriled by the ;plang'er, also.

moves ,"downwardly as it does .so it; permits the roller- 24: tomove downwardly under,

the sactionio f-the pri g 2li-which constantly This. causesithe: arm43 to movevfrom left to right,: so thatvbyzthe time tliplungerxhas 1 descended to its lowermost position, the} arm 43 will move to l its extreme right hand posi tron, as shown? n Figure .45 eDurin'g this downward movement of the hmgemhe j ec tor'rod 28 is held in theri'ght hand position ulajtethea p tlierrpllerze 9' that the device may beadapt shown in Figure.c hythespringitlholding the rod with its pi1'1s70 abutting againstthe bracket 33. This spring alsotends to keep the'end v71 ofthe' latch elevated abovethe ejector rod.vv WVhilethe' lever arm48iwas mak ing 'itsmovement from left to right, as justdescribed, the shoe 44: at one period of the I movement engagedthe top surface of thef latch 3-sothat asthe lever arm 43 smoved; '7

the latch was not only-rockeddownwardly but the shoe 44fwasalso lifted npwardlyoru caused to slide along the arm "43j and these combined movements-,permittedthe. shoe to escape the latch: When the arm43moved the; shoe vbeyond or "behind the'lateh, as shown inwFigurefhth latchrwas caused to spring upwardly again by the spring' 41 and "the shoe 4A moved downwardly by gravity ready for the return or ejecting stroke. Theseroperations will have takeii'place, durin'gthe I downward stroke'of the; plunger ofth presa ljUpo-n the upper or "return stroke ofthe plunger the plate 25 operates-on the. roller 2%l tojswing the lever 19 in opposition to the spring 21 sothat the arm 43 moves fromright tole'ffias indicated in Figure-5; ;Du'ring this return stroke the'fro'nt end of the shoe' 4e first engages theback of the latch Mend as v the latch 'cannot pivot counterclockwise be r yond the position'sho'wn in Figure 5 the shoeipushes on .thedatch and causes both the:

latch and the ejectorrod to slide; "One-end ofthe ejector-rod moves through theslot29 of the lower die ll andpushes the pieceof' i work 72 which has been'formed or otherwise actedupon by the die members, laterally out of the machine to discharge down the slide ,73; When thejlever arm 43 move's to the left a point is reached, as shown in" Figure 5; when the frontendjofthe shoe MC-rises over me s 10 5 the point of jthe latch 34 -and as soon as I thisaoccursitherlatch trips from theshoe and thelsp-ring 41 rapidly, pulls theejectorhrod and the latch to the right, into the position shown in Figure 4;: As soon as the point, of

thelshoethus passes theupper end 710mm latchlfandithe latch, begins toimove to the ri ht-undertheaction of the spring ll yithe nppe r'fendofthelatch will be depressed as) 1t; travels along the under, curved surfacef73 f IgDuringtheflownwardr 1 Ok a of the shoe, soth at the latchIisrocked o-n its,

pin 35 fThe shoe: is \also'caused to slideup-z 'wardly on the, armj43 toper mit" theIla-tch to entirelypass the shoe to bring'the parts into 'the"position shown-in Figure This condi- "tion is broughta'bout by the' time the'plnngei" 7 v p p v has repeatedits upward orreturn strokes-At tendstogmoyeithe lever119in onegdirection.

eachcompleternovement of-the plunger'ffor akst anrping 0r; similar o-peration, the move- I ,mentsofsthesafetydevicesand ejectingdeming of fthe} plate, in relation to 8. The combination of a stamping press or similar machine adapted to operate on stock 7 .fed" thereto and having a reciprocating, plunger, an ejecting member for ejecting the stock from the machine on the completion of the'downward stroke of the plunger, a spring for causing rapid retraction of said e ecting member, means actuated from the plunger for moving said ejecting means, said latter means plunger to. cause said tripping members to escape each other and place the ejector operating member in operative position, said ejector operating member being operated during the upward movement of said plunger to cause a gradual movement ofsaid ejector member in the direction necessary to eject the stock, said tripping members being adapted to automatically trip intime forsaid' spring to retract the ejecting member by the time the plunger completes its upward, return mover ment.

Signed at the city, county, and State of New York the 11th day'of April, 1929.

ISIDOR NEWMAN.

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