US276625A - Machine for shearing sheet metal - Google Patents

Description

(No Model.) H5 Sheets-'sheet 2..

` G. PERKINS.

MACHINE FOR SHEARING SHEBTMBTAL.

Patented M ay 1,1883.A4

(N-o Model.) 5 Sheets-Sheet .3.

G.' E. PERKINS.

MAGHINE lEOE SEEAEINEv SEEEE METAL. 625. I "lPatentedfMay No 3f (NowM'odel.) l sheets--Sheet 4.

MAGHINB Fon SHE-153m@ SHEET. METAL. No.2766255. p Patened May 1,1883..

Haze: l l

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Nrrnn STATES ATENT Ormea.,

GEORGE PERKINS, 0F PHILADELPHIA, FENNSYLVANA.

MAGHINE FOR lSHEARING SHEET METAL.

SPECIFICATION forming part of Letters Patent No. 276,625, dated May .t, 1883. y y l Application tledNovemher3,1S82. (No model.) I

To all. whom itin-any concern: Be it known that I, GEORGE II. PEaKINs,

ot' the city and county of Philadelphia, in the State ot' Pennsylvania, have invented an Improvement iu Machines for Cutting, Shearing, or Trimming Sheet Metahot'pwhich the following isa specification. l y

` This invention is an improvement upon an apparatus for cutting or shearing sheet metal which was invented by me and patented to me, as assigner to the Le Comte & Perkins Manufacturing Company, (Limited.) in and by Letters Patentotf the UnitedStates No.194,168,

dated August 14, 1877; and it is also animprovement upon an.` apparatus o f the same class invented by meand patentedto me in and by Letters Patent ot' the United States No. 260,779, dated July 1l, 1882.

To the above-named Letters Pa tent reference is to be made for a. thorough understanding of my present improvements, as the latter relate to, employ, or are connectedu'ith the princilpal instrumentalities of my former invention.

preventing its displacement from rectilinear.

position upon'the feeding-chute, and for preventing the bucklingot the sheet upon the chute.

v1t also embraces improved means for retain- 'ing the sheetfnpon the chute until thc moment ot' its nal passage'to the cutting mechanism. In my iirst patented apparatus the principle ot operation of trimming the sheet of metal is.

carried into etiect by means of certain combined instrumentalities, which may be briefly stated to consist of an endiess belt or carryingapron, which is caused to travel against and aroundv a. revolving bendingdrum` provided with a circular cutting-edge, operating in con nection with another circular cutter upon a drum orshai't contiguous to the bcndingdrum,

the drum over which th'e aproujs vbent. that sheets of metal fed upon the chute descend upc-u the drum beneath the point where the apron first-comes into tangential contact therewith, so that the sheet is gripped between them and carried half-way around the drum in such manner that its edge in the 4passage comes between the cuttingedge ot' the hending-drum and the cutter which co operates therewith, and is thereby trimmed, the trimmed sheet heing discharged at thcrear of theiiending-drum. All ofthe above memhersare suitably assembled in the framework. l y

in my second patentedinvention above cited certain improvements upon my rst .patented invention are embraced, which it'is proper,

sheet, ot' two chuteslocatedin ditterentplanes, l

(the tirstadapted to receive a sheet oi' tin supplied-to the machine and feed it upon the second chute, and the second chute `adapted to receive the sheet so fed.) It also embraces, in combination with the'two chutes referred to,

mechanism for advancing the sheet after it has i Vdescended upon the'sccond chute in contact with the shearing mechanism. It alsopem-Y braces the combination, with the main chute,

ot a spring-plate applied to one side ot' the chute and adapted vhy suit-able mechanism to set over the sheet true against the opposite side of thechute; and'it also embraces thc combination vof said' primary and secondary chutes, each ofv which is provided with a gate, controlling its discharging end. Other minor combinations and instrumentalities are embraced, which are not improved upon in my present invention, and which therefore do not require mention.

The elements ot' my second patented inven-v IOO 1, with the exception thnt'theright-hnd sirio' i'rnnie,or that nearest the eye7 andV all mem hers 'of the apparatus exterior to said right-hand side frame are removedwhile the innn chute and primeryehute are represented in contrai sectional elevation. in this view the eppuretnss represented ntrtne momentv whentne sheet o ttinhns descended from the primary -2 chute upon the moin chute und before the 2o" pusbersfhar'e operated to force it down the "uciiuiei end into the embrace of the bendingdrainingduring the period, also, 'hen the hold- Y don/usare bearing upon the sheet ond-at the [moment when the' moin goto is closed to'prelrent thelpnssege of the sheet of' tin fed upon 1 it, Fig.. 3 isnpariial detailed riew similar to -thnt oi' Fig. 2 ot-"certnin of the ports repre 'sented insetti 2, especially illustrative oi' the operntioilrof the .pusiieirs main gute, holddowns7 nndstople'frrs, the various members of the apparatus heingrepresented at the mo nient when the sheet of tin'is in 'the nctotde-v seendin'g from the primary chute upon the-secondary chute, beforeftne pushers have been.

retracted utter their inst forward throw`,.and nt the time when the stop-levers block the passage of the sheet from the nininhiite. Fig. lhis o. top pion view ofthe opperiitn's represented in ythe previous views, the view being teken et right ongles to the plane ot' the main chute and in the direction ot' the arrow No. l.

lin Fig'. and the apron-roll E being supposed removed. Fig. 5 is n rear elevational View of theapparatusrepresent'edin the previous viewer token in n 'plane at right ongles to the pinne i of the mein chute and in the direc-tion ci' the f orrori7 No. 2 of said Fig. f5.

are in the position which they are represented ns occupying in; Fig-2.. Fig. 6 isu.l ysectional detailed-elevation token transversely across thelowerportion of theimain chute nt e point Vin advunce'ofvthe guge-piatesand at right angies tosaid chute, the plane ot'riew. being 5.5

siiniiar to that of 5.-

7 is o. sectional jdeinil View transversely' to orient', the tubular beoringsot thel gegeplates', sightbeing teken at rightengles to the pinne oi' the section of ltiig.` 6 on theline 3 3 of said'F-ig. Fig. 8 isv n sidevelevationelg-gietail of'one'of the pushers.

" Fig. ii is e. sectional dctaiirepresenting-ii com jjenieni: inethcd'oi 'securing the cutters in* to `one ot' the side frames. Figs. ,10 endil ere.

top u'views ci the priniery and z'nain'chte's,

iiast ting two positions or, sheet of tin,

L 'on 'the mein chute. in Fig. iii prior to ite he .ing noted-upon the onshore', und in iig.

in this View sight.

has been commenced.

et the moment when the pushers are forcing it down the main chute, representing also the posit-ions of the gage-pleitos with respect to the nbove'positions of the sheet. Fig. 12 is o view-in vperspective of o sheet of tin which is, fue illustration', supposed removed from the maehine'nfter the actionoi trimming its edges spending ports, y in the' accompanying Sim'lar letters ot' reference 'indicate vcorresente the'side irarn'es ofthe machine, which are two parallel housings of suitable material suitably Ierected and united together by crossl hars B orother suitable means. These frnmes are oi' semicrenlnr contour, cut out prefereioiy in V shape from the upper edge down to 'an approximately central point in order to offord Iconvenient central hearingjQiforthe 'shaft oi the bending'drnm D, which is placed horizontally between .the side fraiiies,1ns well represented in Figs. 1 and 2.

` E E iii? ore apron-rolls likewise'trnns'verscly and horizontally journaled between 'the side freiner: in such position and relation es to 'cause the 'ndices npron. F, which travels aroundtfhein, to semi-encircle the hending'drum und he stretched tout against it, ns represented in Fig. 2. The two'iower apron-rolls are adjuntable to impart vthe requisite tension to the apron, as described in -iny i'irst pntenh G G,'Figs. i and 2, representbosses in the framework, designed to receive revolving cut- IOO ters of the character patented to me in and by Letters Patent No. 240,176," dated April 12,

188i, which operato upon the sheet of tin bent around thedrnnn and serve `to trim its edgei In 1ig. 9 are shown two cutters, mx m", ser cured in said bosses G in the housings, and so placed relatively to the bending-drum D as to operate upon the edge of a. sheet 'ot metal caused to pass oroundsaid drinn.

E is the main or feeding chute, being on in elined piatforinerected :it an angle ot' t`ort.y five degrees between the side'fra'mes ot' the machine, and having its lower or discharging end. terininnted upon the surface of the bending-drum at e point in advance ofthe pointat which the apron eneounterssnid bendi ng-d rum, ne represented inhigs. i, 2, 3, and 4. The

chute is provided with sides I, which extend upwardly andbnckwnrdly beyond thereceiving end J ofthe door of the main chute.'

All of the foregoing elements-the cutters, however, being of a vdii'erent characterwere lio embodied by me `in the invention `for which the'trst Letters Patent' hereinbefore referred to were granted tome. y l

K is the primary chute, erected between the sidesl otfjth'ein'nin chute at a point chore the' receiving rnd ot' the letter. it is designed to This primary .tremity by n' mein. 'gastes L; siipporteti"tronsre'reeiy oetween the sides of the chute. upon afford, the irst resting-place in thern'eohine 'forthe sheet to he trimmed. chute is controiied us to its' discharging' ex 'un roth ll/i which is actuated either to rise and permit the descent by giavity'ot the sheet upon the main chute, as represented in Fig. 3, or else to block the discharging end ot' `the primary chute and retain the sheet thereyand which is equipped with a series ot' cams which separately or in conjoint operation im- 4part movement to all ot' the operative parts ot' my machine. Erected upon this shaft is a main eccentric, P, the periphery of which is grooved so as to receive and-retain against lateral displacement'a circular yoke, Q, titled thereupon.

R is a rock-shaft suitably jour'naled in the .frame-work vtransversely thereto and to the rear of the cam-shaft.

S is a rock-shaft arm erected upon the rockshaft, and designed, through an adj nstable pitlengthwise ot' the main chute by means of a` man, T, to'impart motion to the pusher-frame.

The rock-shaft arm is operated to its oseillatorythrow by virtueof itsconnection through the adjusting-plate U with a yoke-arm npwardly projecting from and being a part of tbe circula'ryokeQof the main eccentric. Through the above means, upon the revolution of the camshaft, oscillation is imparted to the rock` shaft.

V, Figs. 2', 3, and 5, is a pusher-frame, be.

ing a. sliding cross-head adapted to travel dov-etailed projection, W, fitted within a dovetailed'longitndinal way, X, Figs. 2 and 4, eX-

- tending centrally lengthwise ofthe main chute and channeled in the same.

Y is a stirrup, Figs. 1, 2, and 5, secured against-the under face ot' the dovetailed projection W, and projecting downwardlythrough the way Xin the main chute. To this stirrup is connected theforward extremity oi' the pitman T, which isipivoted .to the upper extrem- -i-tyt1 the vrock-shaft arm. Upon tbe oscillation of the rock-shaft arm through the above- 'I described connection the pusher'- frame is caused to reciprocate lengthwise vot' the main chute.V l f Z are two the main chute at either s'ide'and lengthwise 1 thereof'. g They lcan be` seen `in, Figs. 4'and 5.

In these grooves play carriers u, Figs. 5 and 8, fitted theretoand connected with the under face of thepusher-frame, so as to beoperated thereby. The proportions ot.' the carrier are 1. such that they areV embedded in the grooves Z,

i and do not project abov e`the plane otf the face ot' the main chute.

I b, Figs. 2 and 8, are jaws adjustably erected upon the carriers, and c are `the guards Iof the .parallel grooves or ways channeled out of the upper or bearing surface of sa me. The carriers,jaws, and guards together for ..1 the pushers. I derive from this construction of the pushers stcadiness ot' throw and a fixed and invariable relationship between the two pushers which is of advantage in the act advance ot'` the sheet.

d, Figs. 2, 3, and 4, are feet upon 'the main gat-e, well made when of thc t'orm represented in the drawings-that is to say, with a broad bearing-reach upon themain chute.Y rFhe feet rise and fall with the main. gatefwhich is operated from a cam, c, Figs. 1,4, and 5, located upon the camshaft exterior to one ofthe side frames, and adapted to bear upon the rear extremity ot' a lever ot' lthe tirst order,f, Fig. 1,'

the front extremity of which isconnected with the lower extremity o.`- the links g, tbc upper extremity ot' which is connected with a crank, h, upon the axial rod M oi the main gate. rlhe depression ot' thedever in the revolution of its cam upon the cani-shaft causes the elevation at predetermined intervals of the main gate.

i, Figs. l and L1, are springs applied on either side of the chute to the axial 'rod 'M in orderto return the gate to its closed position after the lever-and-'link connection thereof have been relieved of the depressinginfluence of `the cam4 c in the revolution ot' the shaft.

j j, Figs. 2, 3, and 4, are hold-downs, being long arms loosely hung at their rear ends upon the axial rod of the main gate, tirst curved downwardly as toa part ot' their extent, and thence continued in straight lines so as to constitute extended pressing-surfaces parallel with the main chute, and adapted under suit-` able intluences, hereinafter described, to press at stated intervals thereupon, and retain the sheet firmly against said chute and prevent its buckling during the time when it is being pushed down the lattenby the pushers. The movement of these hold-downs above referred to is occasioned by the rockingiof a secondary rock-shaft, k," Figs. l', 2, and 4, transversely journaled with respect to the main chute, and overbangng the same, to which the hold-dwns are connected by links l, Fig. 2, attached to rock-shai'tarms iii-,keyed upon said rock-shaftf Motion ot' oscillation is imparted to said secondary rock-shaft` by means of a bell-crank lever, n, Fig. l, pivoted againstrtbe side of the frame-work, linked as to its upper arm by means ofthe link oto a crank onthe end ofthe secondary rock-shaft, and operated as to its horizontal arm by means ot'alit'ting-cam,p, upon the righthand extremity oi' the'driving-shaft. The operation of-thiscam'issotimed as todetect the bell crank and thence rock thesecoudary rock-shalt, so as to raise the hold-downs frdm theehute at thegmoment when the sheet `oat tin has been completely entered into. the embrace ot' the apron' and bendiiig-.druim and is also so timed as to'enable`the proper return of the bolddowns'throngh the iniiuenceot' a spirali spring, q, Fig. 1, linked tothe horizontalarin ot' the bell-crank, and operating vto draw the latter `downward upon `the revolution ofthe. cam from beneathsaid horizontal arm, V

4 l erases r are two stop-levers, Figs. 1., 2, 3, 4l,i 5, and I compressed spiral spring, c, which, in theab.-

6, fnlcrumed to the under face of the main chute. and provided as to their front extremities with 'nptin'ned-toess,whichproiectthrough openings t. Fig. el, in the main chute, close to its discharging' end. i The rearwardly-cxtending arms oithese stop-levers rest upon lifting- -cams u, Figs. 2 and 5, keyed upon the camshaft, and operating upon their.` lift to eleva-te said rearwardly-extending extremities of the levers; ln that position ot' the driving-shaft in which thecamsjreferred to do not operate to elevate the stop-levers, said levers occupy',

the position represented in Fig. 3--that is to say, with their toes extending through the slots in the-chute which receive them, and

' 'serving to bloclr thev discharging extremity of said main'chute. 1n the revolution oithcdriving-shaft at the moment when the cams u litt these levers the toes are. '.rithdrawn from the slots and no' longer block the chute, but permit the descent ofthe sheet therefrom, as rcpvresented in Fig. 2. l

Ae, Fig. 2, are spiralsprings, which serve to return the slop-levers ai'ter the lift ot' their cams, and which also operate lo keep them constantly in engagement with said cams.

These cams are so timed asto cause the operation of the stop-levers oppositely with the operation of the pnshers-that is to say, bei'ote the pnshers advance the toes of the stoplevers are retracted, and upon the retraction of the pushersl the toes oi' the stop-levers are advanced.

w are spring presser-feet, pirated upon'across-bar, x, erected above the ehnte transversely thereto, and near its discharging end. They are represented in Figs. 1, 2, 3, 4, and 1i) ofthe drawings, and they serve to prevent the buckling ofthe sheet at the moment of its discharge..,to the carryingaproin'and also its possible escape from arrest by the ses oi' the stop-levers.

y are Asumilemental presser-feet, ol elastic material, which combine with the springpresser-leet referred to, and are applied for similar reasons'.

ln my second patented invention cited I vhave described a spring presser-plate applied able portions of the sides ot' the main chute.

They are, considered with regard to the plane ofthe main chute, vertical plates curved downwardly. along their uppermost vertical edges, and whichv are supported upon the inner extremities of slides aZFigs. l, 4, 5, v7, i0, and

1l, passing through 'tubular slide-bearings bi,

and also passing through other bearings c, exterior thereto. Around the right-hand slide, and between its exterior bearing, c", and the collar d* thereupon, Figs. It, 6, 10, and l1, is a lar spiral spring surrounding the left-hand slide, and between thetubularhearingb thereof and the collargx thereupon. This spring, inthe absence ol' opposing force, operates to throw out the left-hand side gage-plate. h, Figs. 6 and 7, are slide-studs downwardly projecting from the slides referred to,rigidly"connected therewith, torcnvenience incased with: in the tubular bearings of said slides, and passing through slots transversely out in the main chute, as represented in Figs. 6 and 7. These studs are embraced as to their lower portions, which project below the under face 0i' the main chute. bythe forked eudsLof slide-operating levers i j", Figs. 1, 2, 5,and7, which are suitably I pivoted beneath themain chutein such manner as to be capable of being vibrated from side to side. The opposite orrear extremities oi'- these levers are provided with laterally-facing heels k", each ot' which faces in the samedi- 9o rection, and which bear' respectively against camsA l", Fig. 5, the operating-surfaces ot' which are upon their sides and not upon their peripheries. These earns l* are sothrmed as Vto occasion the lateral throw of the slide-operating levers, from which throw results thelateral throw of the slides which carry the gage-plates. These cams lx are so timed asto throw the slide-operating levers at intervals which are not correspondent as to both levers, but are roo such as to occasion the deeetion ofthe lefthand gage-plate inwardly by its lever beforethe deflection of the right-hand gage-plateinwardly by the expansion ofthe spring which is coiled about its slide. The operation of m5 these slide-operating levers is opposite, .the left-hand lever positively operating to throw in the lefthand gage-plate, while the righthand lever positively operates to draw out the right-hand gage-plate. This arrangement of 1ro course renders the operation of the spiralsprings opposite, the left-hand spring operating to draw ont the lefthand gage-plate and the right-hand spring operating to throw in the right-hand gage-plate. This arrangement 1 i5 may of course be modified, as any skillful mechanic w'ill at once comprehend. Be the operatiolnhowever, that illustrated and explained,4

or of other character, the gist ot' the contrivance resides in the movement of the gagexzo plates alternately-that is to say, in the placing and retaining trst of the left-hand gageplate slightly insidethe line ot' the left-hand side ot the main chute, of which it is in effect a part, and while it is so heldin moving the x25 right-hand' gage-plate inwardly, so as to cause it to set the -sheet; up and over against the otherpla-te, which is still in, and in then causy ingthe receding ot',4 'first the right-hand plate and then-the left. The object ot` this alternate r3o and opposite action of the gagoplates is to enable the accurate lateral setting ot' the sheet upon the main chutethat is to say, its ser with respect to the sides of said chute audits ers descend they may encounter the sheet in breadth of chute, and as the side gages are,

Y that when it resumes its rest upon the chute it tendency of the gage-plate would beto cause i the side of the sheet to true itself with said .neous opposite movement of both is to prevent causo the sheet to buckle wiiloccasion the placing in the proper position with respect to the line of the cutters, so that when the pushproper position for them to push it into the cutters, in order that the latter may trim so much of the edges only as is desired. The receding of both the gages prior to the operation of the pushers and after the completion of their proper function avoids all frictional resistance against the sides of the sheet in its descent, as the sheet is narrower than the full as described, withdrawn from` contact with it prior to its descent. The necessity` of withdrawing both gage-l'ilates prior to the descent of the sheet arises from the fact that if one gage-plate were allowed to remain in and in contact with the sheet, and the side' of the sheet so in cont-act should happen to be other than rightangular with respect to the end of the sheet against which the pushers act, the

gage-plate, throw the end the pushers operate upon out of rightline with the carrier-jaws of said pushers, and cause the passage of the sheet to the cutters in an oblique or angular position. If both gages remained in, they would exert great frlctional resistance to the passage of the sheet. A further object of the alternate` mction of the gage-plates as opposed to a simultathe buckling up andthe subsequentspringingback of the sheet which would take place should thesheethe slightly wider than the space between the gage-plates when both were in, and should they come together simultaneously and simultaneously separate, for, as will be readily understood, vthe sudden relief of such pressure exerted by the gage-plates as would springing back of the sheet irregularly, so

will not be gaged thereupon. In the opera tion of my machine the hold-downs act to retainrthe sheet flat upon the chute after the gage-plates have acted to set the sheet in proper position upon the chute.

I have herein specified certain detailed me chanical arrangements, and have represented them in the drawings. I desire now to state that while I believe the mechanical contrivances referred to will enable the carrying out of my improvement into practical operation, I do not,however, intend to restrict myself to the precise forms represented, as I am Well aware that many allied mechanical devices, when assembled in the relation and combination invented by lne, will operate t0 effectuate in perhaps an equally-perfect manner the rcsults which IA first have obtained by the employment of the elements themselves. Thus, while it is ofthe gist of' the invention that the pnshers should be reciprocated lengthwise of the main chute, the gage-plates operated interrnittingly with respect thereto, the holddowns alternately lifted and dropped, andthe stopvle vers caused to rise and fall, it will be very obvious to askillful mechanic that many mechanical devices other than those represented and described, butlin all respects equivalent therefor, may he substituted in their -stead and the operation referred to equally i I therefore state that I lay well effectuated. little stress upon cam or lever-and-link constructions as such, and illustrate thcm merely as practical means well adapted to subserve the ultimate results in view.

Havingthus described my nvention,-I claim and desire to secure by Letters Patent of the United States- 1. In an apparatus for trimming or shearing sheet metal, the following instrumeritalities in combination, to wit: shearing mechanism adapted to cut a sheet of meta-l to a uniform width, a chtite or table upon which the :metal to he cut is placed or fed, and the reciprocating frame hereinbefore described, consisting of a slidiug'cross-head provided with a dove tail projection, and with pusher-carriers equipped with jaws and fitted `to reciprocate lengthwise of the chute, substantially as dcscribed.`

2. In an apparatus for trim ming sheetmetal, in 'combination with shearing mechanism adapted to eut a sheet of metal to a uniform width, a chute upon which the sheet of metal to be trimmed is placed or fed, a gate at or near the upper extremity of said chute,` designed to control the introduction ot' the sheet upon thc chute, stop-levers provided with upturncd toes which pass through openings at or near the lowerextremity of the chute and` which control the discharge of the sheet to the shearing mechanism, and means for operating the stop-levers, so as tooccasion the intermittent elevation and depression ofthe toes withrespect to the carrying-surface of thc chute, substantially as and for the purposes specilied.

3. In a machine for trimming sheet metal, in combination with a main chute upon which the sheet of metal is fed and travels, thc hold downs hereinbefore described, a pushing-frame equipped with pusher-s, means for intermit tinglydepressingsaid hold-downsagainst the face of the chute and for elevating them therefrom, and means for intermittingly reciprocating the pushing-fraaie, substantially :as and for the purposes specified.

4, In a machine for trimming sheet metal, the following instrumcntalities in combination,

to wit: a main chute upon which the sheet of metal to be trimmedqis placed or fed, a pushing-frame for advancing the sheet in'to contact with shearing mechanism, shearing mechanism, two gage-plates at oppositel sides of said chute, and mechanism for occasioning, first, the advance of one gage-plate; second, the advance of thc other gage-plate; third, the retreat of said last-mentioned ga 'gc-plate, and, fourth, the retreat of the gagc-plate first mentioned, substantial'lyas and for the purposes specified.

5. In a machine for trimming sheetY metal,

e .er/eeen.

in .combination with a feeding-chute, one or more stop-levers provided with nptnrned toes adapted. to pass through apertures formed nearithelovver extremity of said chute, and mechanism, substantially' such as descrihed,. for alternately projecting said toes above 'the level of the carrying-face of said chute and retraeting them beneath said level, substantially as and for the purposes set forth.

6. n a machine for trimming' sheet metal, in combination with mechanism for trimming the edges of a sheet of tin or other sheet metal, a primary chute adapted to receive the sheet to be trimmed, a gate for alternately closing said primary ehute and opening it to permit of the escape by gravity of the sheet placed there upon, a main chute so relatively placed with respect to the primary chute es to receive the sheet vas it descends from the latter, step-levers proanism, a, `)pushing-frame adapted et predetermined,intervalsv and hy sniteble ineens te foreethe .sheet 'down the' chute, stop-levers provided with upturned toes likewise adapted at predetermined intervals not correspondent with 'those at which the pushers are operated to either block `the discharging end Iof'said mein chute or to ieave i'tfree for the 'passage ofthe sheet, and means i'oxl-operating thepuehers and the stoplevers, substantielly as end for the purposes set forth.

8. In a machine for trimming sheet metal, the combination of a main chute, 'two gegepletes-one u pon each side thereof-and means, substantially such as is set forth, for occasioning, irst, the advance of one gage-plate; see ond, the advance ot' the other gage-plate; third, the retreat of the last-mentioned gage plate, and, fourth, the retreat-of the gage` plate irst mentioned, substantially es and for the purposes speeiiied.

9. in a machine for trimming,r sheet metal; in combination with the main chute provided with a longitudinal Way, a pnsherlframe consisting ot' a'sliding cross-head, a projection v adapted to `said my, and pusher:y carriere equipped with jaws, substantially as set forth. l0. In a machine for 'trimming sheet metal, in combination with the main chute, the sten levers provided With toes, the presser-feet, and the pushing-frame, substantially as set forth. vIn testimony Whereot' have hereunto signed my name vth'isfd dey of Novemheryri. 13.21882.

. GERGE H. PERKINS. in presence of l J. BoNsALLTM'LoR,

JOHN JOLLEY, Jr.

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