US2319568A

US2319568A - Punching device

Info

Publication number: US2319568A
Application number: US441594A
Authority: US
Inventors: George F Wales
Original assignee: Individual
Current assignee: Individual
Priority date: 1942-05-04
Filing date: 1942-05-04
Publication date: 1943-05-18
Anticipated expiration: 1960-05-18

Description

"May 18, 19143" Filed May 4 1942 l @Y-15. 1

G. Vr- WALES `PUNCHING DVIGE m 2 Sheets-Sheet 2` n f Patentes May is,f 19431 r i sms-S and] other material Vand :"'more 'particularly to punching devices which are-*intendedfor usein connection with `V`4a pressorrother power operated andi-including aholdeonlfwhich the punch and t i uio uriitsaro suppoftedhove'been matie witha f stationary i die mounted 4in fthe "oaselof the "holder iparatus for. punching` or perforating 'sheetj'metal t tion willi-appear from. them and claims. s; i n

and 'a movable-punch? adaptedohe actuated by 1 the ram of 'the ypress; and movable "toward and `from the die.` "1t has been found that undercertainconditions' jof1-le,`fdiculty is experienced in disposing 'oi' the slugs or' punchings reinoved t from the Work, this difcultylbeing particularly renounced when thei'punching devices mustdbe c `Imountedveryciose tog`ether.* One' of the objects oi'tthis inventionfsvto pxo-` n :vide a punching device*whichfis` soconstructed jv that the punch -i's 4stationaryand 'the die" is movable` toward fand jfroin the punch;` Another` object of this `invention is to provide a punching device of thistype inwhichA the'"slugsorpunch`` o ings-are dischargedfromthdie above the work which is being" joperated upon@ 'Another object ofthisfinvention is to provide a punchin'gidevice of irnproved and'sizn'plied constructionfand n i in i which the punch `and die units i are i readilyremovablelfrom thel holder, adinfwhichthe die n sitioning punching devices onza bolster plate.

i QAn'other objectief this invention" ist-oprovide facpunching-ldevice' Yintiwhic'h;thelpunch and-die n `units arciainounte'tiaand.` guidedi lin: aVholder in i t vcorrectnrelation to" eachother in such manner that the forcesexerted on` thesu `itsfbytthexram are vtransmitteiil .to the ybednofatiielpress` with-1 "i.unit/isimountedvfor reciprocation-toward `and i "from thclpunch.`

f `It t is also an object l of this invention. to 'tpro` videta punching device of` this type withfa pilot wpin: of'improved' construction Jfor cooperation t `withter'nplates ortherlocatingdevices.to facilitate the positioningfpf thefpunching V,devices `relatively to eachothcronapressu"` "l A base iri'such a lnianner as Vto tie'readilyadjustf abletoward and from eachother. 'Another ob` Y ject of this invention` is to provide' an' adapter Voi' this iniwhichl the punching devices may be Iadjustedftransversely ofi the'bed of thepiess brakei asrwellas'lengthwisethereof; 1

f other objects and advantages of thistinvooi `mowing; description Intheaccompanying daviiings:`

n 'Figi iis `an elevation, partly in sectionyota Vpunching-devicefandanadapter embodying this Y 'invention andrfshowingf the punching device mounted for'operetiori4 on apress' brake. v i l n Figa-'2 `isii.sectional plan `view Ithereon-on line`2--.2-,1-"ig".1.` n n 1 'Fis'. 3 is a sectionalelevation.thereofy'onra Fig. '4 is a fragmentary iront elevationzof an Vadapterfior mounting. a punchingunitonthe .bed of a `pressfbrakcand cfa punchingftdevice mountedon the adapteru `Fig. ,5'fis Va, :fragmentary elevation; partlyili section, of a punchingdevice mounted Aon atem- Plae. n t

f1 Fig.*6;is `a top plan view-of aportion of a T- lslottedbolster plate having a plurality ofpunching devices positioned template. 1;. n t i Fig.- 7 is upside eievatiom partly in'section, of my `improved punching device mountedon a thereonwith the aid om Y. press brakebykmeans ofanzadapter` of modified construction.'` n 1 t Fig. 8 is a. horizontal section taken along( lineA `8fs,;Fg. 7. o f` i Fig.; `9452118 4fragmentarysectional. elevation y Another oloiootoofothisinve" tion-is,V toforovide i Van improved method' `oi?` :perforating wvork, in

accordance 4with which .the `press mayl Ibeioper- 'g l -ated on diierentkindsjof-,woric` withicom'para` :tivelylittle interruption;4 A further object isi-to provide an improved method of al'zcurately'` poout :nrst acting on .the holder. i

`may be -moun tedicncapressobralge.or` elongated Another` object of n this invention` is to Vprovide anadapterby :means t of which-punching devices Fig; 10 is aV fragmentary-sectional eievation n Fig.'V 11; is anfe1evation.ypartiy in sectiinnof` one of(n the punching devices 'showningll'igld improved punching devices,` may" betusedfin connection 1 with a press` Vor` any` other.V machineV 4or apparatushaving astationary partonbedion which `the `punching devices may` `bc-lcsitioned,

an extension I6 of any suitable form secured thereto. In Figs. 1 to 4 and '1 to 10, the bed and ram of a press brake are shown by way of exa-mple.

fore been used in connection with punching devices and of themselves do not constitute this invention.

In punching devices of this type vas heretofore made, the die unit was mounted in the base of the holder and the punch unit was slidably mounted in the head of the holder and was movable 'towardl and from the die unit. Inthe construction shown in these drawings, this condition is reversed and the punch 22 is'stationarily mountedin the base vI9 of the holder, and a die unit is lmovably mounted. inv the head 20 of the holder. The die-unit may be formed-of a single piece die as has heretofore been customary, but preferably the 4die unit includes a die 24 removably held in the lower portion of a die carrier 25`which is mounted to move vertically in an accurately formed guideway, such, for example, asA an aperture in an enlargement 26 of the head 2.0-

of the holder, the-die being -positionedvin-tne carrier so that when the carrier movedVv downwardly from the positions shown in Figs.'1 and 3 to the position shown in Fig. '1, the punch 22 will be entered into the hole in the die, after passing through the work 2 In order to remove the'slugs or punchings from the die, I provide the die carrier 25 with an inclinedpassage or -channel 21, the lower end of which terminates at the-.upper face 'of the die to receivethe punchings from the hole in the die 24, and the upperend of Vwhich terminates at the upper portion of a side of the die carrier, so that slugs passing out of the hole in the die into the passage 21 will accumulate in `the passage and will eventually be discharged'from the upper end of this passage and drop, upon the work 2|, or if desired, the die carrier with the die may from time to .time'be lifted vout of its hole in the head 2U of the holder so that the slugs or punchings may be dumped out of the passage 21. y v i The die 24 in the construction"'shown 1s held Vin its carrier by fitting snuglyin the carrier and,

consequently, may be driven out of its operative position in the die carrier and replaced by another diehaving a holeof different size. v

The punch 22 is preferably provided with th usual punch-head 28,*'to which the punch may be secured in any suitable manner, for example, as shown in Fig. 3, in' which the punch has a portion of reducedv diameter which extends into anvaperture in the headv 28. The punch, conseexamplekby swaging as indicated at 3 In punching devices as heretofore constructed,

; wardly extending flange 35.

a pilot pin was mounted on the holder to extend downwardlytherefrom and in axial alinement with the punch die. If a downwardly extending pilot pin is desired on the punching devices herein shown, this can be done by providing the punch with a portion 29 which extends through the hole in the head to the desired distance below the bottom face of the head, thus forming a pilot pin.

The punch unit preferably includes any suitable stripping means for withdrawing the punch from the Work. In the construction shown, such stripping means include a stripper member 33, which is suitably mounted on a. sleeve 34 extending about the punch 22. The lower end of this sleeve is preferably provided with an out- This iiange cooperates with a corresponding inwardly extending flange 36 formed on an upward cylindrical exten- Vsion 31 of an

abutment ring

38, and 39 represents a stripper spring which is interposed between the abutment ring 38 and the stripper 33. The punch 22 preferably terminates slightly below the upper face of the stripper 33.

It will be readily seen that when the ram I6 moves the punch carrier downwardly from the position shown in Fig. 1, to the lower position shown in Fig. 7, the die 24 will engage the upper face-of the work and move the work downwardly so that the stripper 33 is depressed against the resistance of the spring 39 until the punch 22 has passed through the work and into the lower end of the die 24. Upon upward movement of the ram I6, the spring 39 forces the stripper upwardly into the positions shown in Figs. 1 and 3, thus stripping the work from the punch 22. The construction described also has the advantage thatthe sleeve 34 and stripper 33 serve to 'guide andzupport the .punch in correct relation to the die Y The die carrier may be mounted for correct movement toward and from the punch in any suitable manner, for example, by accurately alined holse or apertures of any desired sizes or shapes. In order to facilitate the manufacture of my improved punching devices, I preferably make the die carrier, thestripper, the punch head, and the abutment ring of the same diameter, and consequently, a pair of alined holes 40 and 4| may be accuratelybored through the enlarged portions of the head and base of the holder completely Yfrom the top of the head through the bottom ofthe base, these holes being spaced apart by the gap between the head and base of the-holder. Consequently, the punch head which is in the' lower part of the hole in the base of the holder will rest upon any support upon which the holder I8 is mounted. Consequently, 'when the holder is detached from its support, a punch of the desired size and its stripper assembly may be inserted upwardly through the bottom of the hole 4| or downwardly through the upper hole 40 into the lower hole 4|. A punch holder of this construction carries none of the strains resulting from the punching operation, so that the holder merely serves to guide the-die in its movement toward and from the punch.

Suitable means are preferably provided for yieldingly holding'the movable die carrier and the die in an elevated position slightly above the punch, so as to facilitate the insertion of work between the punch and die. In the construction shown, by way of example, a leaf spring 44 is provided for this purpose, which is suitably This leaf springmay be held versely extending ho1eu45 Whichmay terminate coaxial'V with the' punch and fdiey` for correctly positioning the punching device on tithe" b'ed offffa presslf 'In the c'onstructionfshown;` aipilotpin carrierin axial alinementwith theccenter of the fhole in the die and with the punclrfZZ; F'Ihelowe erendfof- 4this pilot pini"AS-mayeirtendfinto the `transverse lhole45 of the die 'carrier' andthe upperlend of thefpilotpin `extendsabove the top surfaceof the die to an extent suflicient tof cof voperate with a template, Since; "fhowever the videata-fthe upper portionwtherecf-withfatransi t movable ram for` actuating the punch' glldevice;

f @ther-pneu psn tsffis siidablymountedfflinla hciejslm the'upper'portion ofthe die-Jcarrier; so` tliatfvvhen i thetramvdescendsfthe" ilotpin @dinay be pushed t dovmfinto:` the" carrie' Alspring is preferably p `einplyedfonyieldingly rging' the'tpilotfpin-i shownA forlthis? purpose, the spring 'ineinber 44 t Inaywbepro'vided with!` an ar'rn ori extendsl underneathifthe pilot pinwin a position lto":yieldingly 'urgewthe pilot l into fits upper fposii afec which into, its? upper` zpo'sition "Infthewconstructlon "1 `ticrnf The pilot pin' d8 is 'preferably-'provided at l 1 mtoithe canin thelhoider," mi intneufccnstruc-H tionxillustrated` byway of examplefantadjustable C t gage bar 52` extends throughaholeiinthe holder `lfxand maybe locked inl'positionlbyfmeansiofa set-screw` zextendingthrough afflugwor prof4 jecting'portion 54. of the AholderlffThe 'age is Y provided With aworkengagingfface,sdc

lfthe punch; t"Cons'qnently,` the movement of the i work'by` the die will `not cause any displacementtV l,55 5:5 My improved punching devices iriayibe nioiintffV *.otthelwork due to contact with the gage? y "l edon pressesfin anylsuitable or' desiredmannerg Preferaloli'r` I yproviclelfin` the baserofxtheilfholder i s the 1 f face on the work engaging l` end of ithe gY ge bar t 52, whichsextends parallehto-"the directio'n'jof" movement of `the Work by the idle relativelyto"r ofhl'derfor use connection with niy-'punch ing devices and `for `use in mountingfthe punch-'- ingfdevicesfon"bolsterplates oi anysitable conf struction adaptedtol' receive clamping means,

suchasf bolts vfor?securing 'punchingi devices t L thereto. ""f-'hefselbolster plates may, for example,

`beV inthe form of jr-slottedplates ofthe type commonly employed inconnectionwith-presses.

.The holdersf `63 shown in FigsJlB and llfare pro; videdwithlongitudinal slotenM and-65 in the heads? and `basesrof the holders. YThe portions ofthe holders -in` Which-the punch anddieA units are arranged may be the' same as those described 11i-connection with Figs. l to 4. "One or more 'bolts Simay be inserted throughfthe'lowerslot 65 of the holder into 'engagement "with threaded nuts Sl'arranged'in the slots`68 'of the bolster plate-'69.The heads of the bolts 66' are preferably offth'e `typehavinghexagonal holes or re-` cesses `in the `upper portionthereof; which may be engaged by 'means 'of the lower' end Aofva hei:-l

` agonal14 bar 59d which may` be wextended` through the upperislot 64inordertooperate-on the `bolts devicesato thebolsterplate maybe providedv i. l

68;? Any other means for securingthe punching' f Inorder torcorrectly position the punchingl dc-` vi'cesionjalibols'ter platefa template 'I0 is'prefer ably provided `fo"r'cooperatio`n1 with the"` pilot pins i ltof` thedie carriers. Thetemplate 1U is pro `videdYtvithany desired numberJ of holes 'll 4ac- 4curately `lformedl` in the template in accordance" c withtheholes` desired in thework. The various punching` devices as shown 'in Fig. 6 are posi-4 tionedrunder the templatef 10 so that 4their pilot t pins 481i extend! through the vholesll.' `This can Y best. be accomplished by first supporting the template on" threeor morepunchingdevices,

andi-then' shifting these punchingj devicesand any others that Fare to* be used horizontally"` `on the bolster plateu ntilithe` pilot pins snapi` into place `through"` theV holes inthe template-@which 'indicates'` that such punching devices are in the correct positions; The holders163 of' the punch- ,ing devices arethen secured to the:` bolster plate Y Vin such positions by tighteningthelbcltsri, and Y the template 'mayf be" removed* when all 1 of Ythe punchingdevices are secured on `the bolsterplate.

l '1'I'he"constr,uction disclosed-ln Figs'. 6j and l1 t may be usedin carrying out my improved method of perforating. work 'accordance Vwithfthis method; a number of .bolster'plates are provided .for each 'press andthe .punchingdevices Iorany job maybegsetzup'on a` bolsterplate before the i be readily done by using templates 10 as illus# l t an upwardly extending threaded hole or aperture $6, in'w'which a 'screw may engage Y foi"A securinig` the; punching fLlevicexto av support-` t Inl Figi-551 mounted on l a fsjtemplate 58;A =`-which may'` 1" have i i 'a plurality" .of holes-il accurately iforxiied" therein fhave illustrated rmy improved punching device' as n i t ""ng devicesgone suchwpilnching device fbeing Y hole 59, adapted to receive screws 1 6 0 ior securing f the` use of Vtemplates inT connection with punch# for securi'n the templatef toa b'ed'iifof a. press,;

videdwith a countersunk'lholef forleachpilot pin` press;` Bymeans'ot .this method, the press may plate `isA placed on'rthe bed of repress.4 This c'an tratedl'ini Figs 6 and `11. After the` punching devices have beenn accurately positioned l on a bolster l plate )andL secured tthereto, the bolster fplate is ready tofbeplacedonitheibedoi'za press Y and while this bolster plate is inuse, the punchfing deviccsj for' `another tjob may then set up onfanotherbolster plate whichn can be placcd on'thebedfof the'ipressimmediately after the desired number *of pieces have been punched by means of "i the devices on the frst bolster plate; t

If desired;` several plat'es may'nhave thepiinching devices setup thereon," ready to l be placed in: the

beljkcpt "in almostcntl'nuous usefsince astsoon as the press has completed a jobf by perforating` A the required number offpieces ofjwork, theY T-slottedplatefor thatjobris slid out `ofthe 1i .pressandlanothert-r-sitdblate havirigancther series of `punching devices set up for another job.

- In Fiesso 4and'11S-thrive Shawna modified type is put in the press. The punching devices are then removed from the bolster plate which has been taken from the press and are ready for use wherever desired.

In case of jobs requiring bolster plates Iwhich are too large to be readilyremoved fromthe Y press, the punching devices can be set up on the 'plate while the same is securely boltedto the press bed..

Itis frequentlyA desirable to mount punching devices on press brakes, and I have, consequently,

shown in Figs. 1 to 4and '7 to 10, two forms of adapters bymeans of which punching devices as herein shown as well as punching-devices of other types may readily be adjustably mounted on press brakes.v In Figs. 1 to 4, Ihave shown adapters which-are intended for use where all ofthe Vholes to be f punched in the work are arrangedin a straight line and where the adapters are adjustable only lengthwise of the bed of press brake,v and in Figs. 'I to 10, I have shown adapters usable in case the holes are not all in avstraight line, and in which the adapters are adjustable both lengthwise and transversely of the bed. lIn both of these constructions,'I secure on the bed of the press brake a rail'of any suitable form on which` the adapters can bev mounted. This rail 13 as shown by way of examplev in the drawings isV in the form of a bar of dovetail cross section, having the longitudinal.

edges thereof flaring upwardly and outwardly and having a substantially -at upper surface.

14 ysecured to thefunderface thereof and extending into the space between the twoparts of the base I4. Y

In the construction shown in Figs. 1 to 4, the adapter includes a clamping member 16, which is formedl to be secured to the bed rail 13. In the l with a downwardly extendingA ange 19 having an -inner faceagainst which a wedge member 80 may engage. This wedge member has an inclinedmface 8| adapted to engage the inclined front face of the rail 13', and any suitable means Y maybe employed for forcing this wedge member upwardly into gripping engagement with the bed rail. For example, a screw 82 may be employed extendingloosely through a hole in the wedge member andV engaging a threaded hole in vthe clamping member 16. Consequently, by tightening the screw 82, the wedge member will secure the clamping member securely into clamping engagement with the bed rail 13.

Thek punching device maybe secured to the adapterin any suitable or desired manner. For example, theadapter may be provided withan accurately located hole 83 to receive thepilot pin of a punching device, for example, the pilotpin or extension^29 of the punch shown in the drawings.- `The adapter may also be provided with a suitable shouldered aperture -84 adapted fto receive a part of a screw 85 which may enterinto thethreaded hole 56 of the holder of the punchingv device. These adapters may be secured in any desired position lengthwise of the bed rail so that the holesto be punched inthe work may be located at the desired distances from each.

other. Any other means for securing the punching devices to the adapter may be provided, if

formed between two upwardly extending flanges 88. A slidemember 89 is arranged in this channel for adjustment on the adapter in the direction ofA its length, or in `other words, crosswise of the length of theV bed rail 13, the slide 88 being of a thickness equal to the height of the flanges 88 and being provided with a slot 90 through which a clamping or set screw 9| extends, the set screw engaging in a threaded hole 92 in the front portion of the clamping member 81. If a greater range of adjustments is desired, another threaded hole 94 may be provided in the adapter 81, kand the clamping screw 9| can be removed fromy the position in which itA is shown in Figs. 7, 8 and 10, whereupon the slide 89 may be moved back until the slot 90 is in registration withthe hole 94, and the screw 9| can then be inserted through the slot 90 `and into thehole 94.

The slidev89 of the adapter is provided with any suitable means for mounting the holder I8 of the punching device thereon. For example, the slide member may be provided with a hole adapted to receive the pilot pin 29 of the punching device and may also `be provided with an aperture to receive the head of a screw 93 for engaging in the threaded hole 56 of the holder for securing the punching device to the slide 88.

In the use of this adapter, the clamping member 81 may be secu'r'ed in any desired position lengthwise of the bed'rail 13 by means 4of the wedge member 80. For positioning the punching deviceA crosswise of the rail, the set screw 9| may be released and the slide 89 moved between the anges 88 to position the punching device crosswise of Athe ra-il 13 and when 'the punching device is in @the desired position, thev set screw 9| is tightened for locking the punching device in such position.

Punching devices of the type described in which the die is movable toward and from the punch have a number of advantages over punching devices as heretofore used. In the first place, no holes are required in a bolster plate or in the lower portion of the holder I8 through which the slugs or punchings may be discharged. Consequently, the punching devices may be arranged as closely together as desired, since suflicient clearness toV permit punchings to be discharged need not be provided. By means of the constructions shown the die carrier discharges the slugs or punchings from a side thereof, for example, from the front as shown in the drawings, and these lpunchings may, consequently, be dropped on the work 2l and will, consequently, be discharged from the press when the work is withdrawn. The construction shown also has the further advantage that the force exerted by'the die and against the punchto force the punch t 58, and consequently, Athe punching pressureis transmitted bv the head `of the punch dire tly to p t vertical-alinement, but it `will/be obvious `th i t invention herein-jfdescribed `can be equall ell u u thereto. 1"

vfrom said bed, said punching device includingja '40 n the aperture infsaid base, and a die unit ihovab y 4 I ram ofthe press.` l 'l Fig. tthefpunch head rests on the template,

the template `58 'andfflrom thegtemplatet the 't bed 6I of the presser other parts bn whic the 5 `.template is mounted. Ihrgiarthe pushing-` pressure is transmitted'byr thelunchheadlf''diV rectly to the "T-slotted' bolster p1ate`69.`

The construction described also has the ativan-l tage that the punch and die-umtscan hereasily 1o removed from their holders, since `theymerely f "neat in .the guide holes inthehciders ihjwhih u 1 they are arranged.` Consequently, the die carrier l can be easily removdiorfsharpening the die/for jfor insertionof'another die fandrsimilarly the: 15 punch can be easily removed `from its hole infthe A Y base of the holder and out of the guide sleeve 34/ thereof. The stripper unit Vincluding the Yabut-3 ment ring`31, stripper 33 and'guidsleeve Mil/erin i a unit which may be replaced by units rviiig 0 guide tubes 34 of diierent diameters toflc'oop: erate with punches of differenti diameters', i.

I haveherein describedmy improved 'punching device as constructed with the punch and Idie ing 2 t he employed withla hfolder in which the axis f t punchV` and die at an angle tothe vertica Consequently, the word "base is herein K t describe that part of theiholderwhich suppo `s i0` `the stationary punchin its operative D 0$itic t and the word fhead `is employed to designee'r Vthe part of the holder which guides the movah e used V die, regardless of whether the"head is abo y the base in any other positionV relatively L5 Iclaim asrnvinventon: A g 1.` `A punching devic for use on a press havingg` a stationary Ibed an'd a ram movableftowa'rd and holder having aunitary head and base spac `d apart to receive between themA the Work, axial y alined apertures extending through saidhe d and base', a punch and stripperl unit arranged in` mounted in the aperture o f saidm head Gand el tending abovef said head for-engagement bythe i Y 2. A punching device for use'ona press ihavi gV E astationary bed and aram movable Atoward and 50r V Afrom said bed, said punching device includingia holder having ahead and a base spaced apart to receive between them thework, axially alined apertures extending through said head and `b se, a` t l punch and'stripper unit arranged `in the aper- 55 ture in said base, anda die unit movably mo Vinted in the aperture of saidfhead andextending above said head for engagement-by the ram ofthe 3. A punching device for use on a press having G5- a stationary bed and aram movable toward and l from said bed,` said punching device Vincluding a 1 4holderhaving a unitary head and bases aced apart to receive between them the work, Y

ding, 76

alined apertures of `equal diameters -`nexte n through said head and base, a punch and str pper Y .unit arranged in saidaperture in said base, a dieV carrier movably mounted lin the aperture i l head. and a die mounted on` said carrier i said r0- sition` to cooperate with said puinch. u

said ba e and throug `*the bottom of said* apto said puncht g `4:. Apunchingdevice for use `on a. press hav-' ing vaholderhaving a head and a base spaced apart to receive between them the work, axially alined apertures in said head and 'said base; the aperture in" said base extending through the same) a" punch'unit and a die unit. one of said units being arranged in said aperture `in 'said base"and"being"movablethrough the bottom of saidaperture'when said holder is removed from the press and being supportedv bysaid bed when theholder is mounted on a pressfwhereby pres-V sures transmit ed to said unit from the rain are4 transmitted to said bed without passing through said holder. y ,/j f i i I5.' A pum:L ng d 'vice foruseu on' a. press havi ing a. static ry `1 l"d andra. ram movable toward i and froii sa 'a bea', saia punching device inclua-T ing av heide havng a head and a base spaced apart tof; re eive` A A u alined up! dewayso saidhead and base, a punch f and st I pperun'it ranged in'and free to move lengthwise dn one f saidlguideways, a die unit, `onthe other' guideway an'd free to move lengthwise thereof, the `u t onlthe guideway in said base being s ppor eiy thebed of the press, in'- depende tly of sa d h lder' to VtransmitV pressures u u V [other unit to the bdof the press without iirst transmitting such pressures through fsaid holder.

6. A punching device `for use on apress having from saidb d, said punchingdevice including a i holder navi g a' head and abase spaced apart l to receive between the the work,` axially alined e p apertures` extending thlbugh said head and base, L"

apunchl and; stripper" nit arranged in said aperture irigsaid base, said punchlhaving` ahead of f a diameter to slide len thwise in'said aperturev inA erture, diei'unit in he aperture in said head and mo able toward ntglfrom said punch Vand l, arrange to be actuated by theram, said punch' transmi ting? pres ures received from said die unit -to t ebedof hepresswithout transmitting said `pre suresito id holder."

7. A punching-d vice for useon a press having a stationaybd and egiaLinV movable "toward and from said b d,V saiud'gpunchinggdevice 5in'-` cluding holder h ving a unitary head'jand b'ase spaced apart to r eive between themthevwork.

a punch arr nged'in said aperture in saidbase, a Adie hclder in said aperturedin said head and extending aJovef-Ey's'aid 'headfin lposition to be engaged by aid ram, and 'adie mountedjon said die holder inoperative relation to said punch and having ahole extending therethrough, said die holder having a passage extending from vsaid' hole in said die to the portion of said die holder axially aline? apertures in u said head and base.

i which extends above said head,` to discharge punchingsrA g i 3 A p mphin device for use on a press and .including a holler' having a `unitarybase and Yhead spalced apart to receive between them the work, a punch 4mounted Von said base, a die mounted onsaid head and movable axially `tot ward and from lsaid punch to engage the work and mov the same relatively to said punch `to force theworl; around the punch, and means for: yieldingly supporting said diein spaced relation. pi facilitate insertion "of `the work between said punch and die.

9j. A p nching device for use on a press having l e een them the wcrk,faxially a stationary bed and a ram movable toward and from said bed, said punching device including a holder having a head and a base spaced apa'rt to receive between them the work, axially alined apertures in said head and base,'a punch and stripper unit arranged in the aperture in said base, a die carrier movably mounted in the aperture of said head, and a die on said carrier in position to cooperate with said punch.

10. A punching device ior use on a press having a stationary bed and a ram movable toward and from said bed, said punching device including a holder having a head and a base spaced apart to receive betweenthem the work, means on said base for receiving a punch,` and a die unit slidably supported on said head for movement into and out of operative relation to said punch, said dieunit having a portion extending above said head oi said holder for engagement with the ram oi a press. Y

11. A punching device for use on a press having astationary bed and la ram movable toward and. irom'said bed, said punching device including a holder having a head and a base spaced apart to receive between them l.the work, means on said base for receiving a punch, a die unit slidably supportedl onsaid head for movement position in spaced relation to said punch to facilitate the insertion of work between said punch and die unit.

12. A punching device for use on a press having a stationary bed and a ram movable toward and from said bed. said punching device including a, holder having a head and a base spaced apart to receive between them the work, means on said base for supporting a punch, a die unit slidably supported on said head for movement n into and out of operative relation to said punch,

said die unit having a portion extending above said head of said holder for engagement with the ram oi' a press, and a pilot pin extending upwardly from said die unit in coaxial relation therewith and yieldingly mounted to permit said pilot pin to recede into said die unit when engaged by the ram of the press.

13. A punching device for use on a press having a stationary bed and a ram movable toward and from said bed, said punching device including a holder having a head and a base spaced apart to receive between them the` work, axially alined apertures in said head and base. a punch arranged in said aperture in said base, a die holder in said aperture in said head, and extending above said head in position to be engaged by said ram, a die mounted on said die holder in operative relation to said punch, a pilot pin arranged in an aperture in the upper end of said die, coaxial with said die and punch. and a spring for urging oi said punch extending through said head and below said base to form .a pilot pin, and a die mounted in said head to move toward and from said punch.

15. Apparatus for mounting a plurality oi punching devices on the bed of a press brake, including a rai1 formed for securing on said bed and having a substantially ilat upper face and upwardly and outwardly inclined longitudinal edge portions, a, clamping member for each punching device and for mounting upon said rail and having a portion extending crosswise of said rail and downwardly extending iianges, one of said flanges engaging one inclined edge portion of said rail, a wedge member arranged between said other flange and the other edge portion of said rail, means for moving said wedge member into clamping engagement with said last mentioned iiange and edge portion to lock said clamping member on said rail, and means for securing a punching device on said clamping member, said clamping members being adjustable lengthwise of said rail when said wedge member is released from clamping engagement with said rail.

16. Apparatus for adjustably mounting a plurality of self-contained punching devices on a bed of a press brake, including a rail of substantially uniform cross sectional shape throughout its length and constructed to be secured to said bed, a plurality of adapters on said rail and movable lengthwise thereof to diierent positions along said rail, means for clamping said adapters in the desired positions lengthwise of said rail,

and means for securing a punching device to each l adapter, whereby a plurality of holes may be punched simultaneously in work in the desired spaced relation to each other.

17. Apparatus for adjustably mounting a plurality of self-contained punching devices on a bed of a press brake, including a rail of substantially uniform cross sectional shape throughout its length and constructed to be secured to said bed,a plurality of adapters on said rail and movable lengthwise thereof to different positions along said rail, means for clamping said adapters in the .desired positions lengthwise of said rail, slides on said adapters adjustable in a direction transversely of said rail, means for locking said slides against movement relatively to said adapters, and means for securing a punching device to each slide, whereby said punching devices may be adjusted both lengthwise and transversely of said rail.

18. An adapter for adjustably mounting a selfcontained punching device on a rail, including a clamping device having means for securing said clamping device in the desired position lengthwise of said rail, a slide mounted on said ciamping device for movement transversely of said rail, means for securing said slide in the desired position on said clampingdevice, and means for securing a punching device to said slide.

19. A method of perforating work by means oi a plurality of unitary punching devices, each of which includes a die and a punch cooperating with the die, said method comprising mounting a plurality of said punching devices on a single bolster plate, formed for universal adjustment and mounting of said punching devices thereon, in correct relation to each other to produce the work desired, placing said plate with said punching devices secured thereto on the bed of a press in operative relation to the ram thereof, perforating the required number of pieces of work, then removing said bolster plate from the press, and removing the punching devices therefrom for use on other work.

20. A method of perforating Work on a press having a ramv and a bed on which bolster plates,

formed for universal adjustment and mounting of said punching devices thereon, may be removably mounted, which includes `positioning a plurality of self-,contained punching Jdevices each `including a die and apunch cooperating with the die, in correct relation to each other to .punch l holes in the workinthe requiredrelation to each other and to the work, perforating the desiredV "number of pieces of work whilethe bolster plate lis in operative relation to the press, and securing another set of punching devices 'on another .a bolster plate for operating on other work, removfing said rst mentioned bolster plate from the press when the desired number of pieces have been perforated and immediately positioning saA , 7 the bolster plate, moving said punching devices along the surface of the bolster plate until their,

pilot pins enter the apertures of the template, and then securing said' punching devices to said bolster plate.

23. A method of mounting on a bolster plate,

.Y `by means oi' an apertured template. a punching said second bolster plate on said press for operating on other work, whereby the idle periods of the press between dierent jobs are shortened.

2l. A method of perforating sheets of mate` rial in rvla. pressV having a ram and a bed on which -bolster plates, formed for universal adjustment and mounting of said punching devices thereon,

may be removably positioned, which includes setting upon a plurality of said bolster plates, punching devices each including a die `and a punch cooperating with the die, Vin correctv relation to` each other, each bolster plate having its punching devices arranged for a different job, successively positioning said bolster plates `with their punching devices on the press, and perforating the desired number of pieces of work with each bolster plate, whereby 'the' time required to set the punching devices on the bolster plates involves no delay in the operation. `of said press.

22. A method of mounting onabolster plate, by means of an apertured templatepunching devices each including "a punch and a die in operative relation to each other and a pilot pin coaxial with the punch and` die and yieldingly urged into a position abovethe punching` device,

said method including placing said template upon `device including a punch and-a, diein operative relation to each other and a pilot pin coaxial with the punch and die and yieldingly Aurged into a position above the punching device, which includes placing said punching device on a bolster plate below said template with said template depressing saidf pilot pin, shifting said` punching device laterally on the surface of said bolster plate until said pilotpin enters the desired aperture in said template, and then securing said punching Vdevice onsaid bolster plate while said pilot pin is in said aperture. l

24. A sheet material punching apparatus for use between the bed and ram of a press, comprising a pluralityl of punching devices, eachof which includes a stationary punch and a die movable toward and from the punch, said die extending into aposition tobe actuated by the ram of the press for perforating the work, a 'pilot pin arranged axially on said die, spring means for urging said pin into an operative position in which said pin projects above the die, said pin beingV movable against said spring means into a position in which said pilot pin does not project -above said die, a template for cooperation with a. plurality of said punching devices, and having accurately located holes, into which said pilot pins are forced by said spring means when said punching devices are in correct relation tosaid template, and means for securingsad punching deV` a pluralityof said punching Adevices resting on by saidram.

vices in correct relation to each other when their pilotpins are in the holes of the template, said pilot pins receding intol said `die when engaged GEORGE. F. WALES.