US1776390A - Folding machine - Google Patents

Description

P. R. GLASS ET AL FOLDING MACHINE Sept. 23, 1930.

lFled Jan. 16, 1926 5 Sheets-Sheet l' Zij jg j 115 Sept. 23, 1930. p. R. GLASS Er AL 1;?76,390

FOLDINGMACHINE 'Li'filed Jan. 16, 1926 3 Sheets-Sheet 2 Fig. 9.

M7 df/0g Spt. 23, 1930. p. R GLASS ET AL n FOLDING MACHINE lFiled Jan. 16, 1926 n Sheets-Sheet 5 Patented Sep't. VV23, 1930 l v` PERLEYB. GALAssv-or 'vvAYIn/iirij,` YAnni JAMES n'. MciNTinE; or PEABODY.iiriissAoiaii-y` jgsETTs -AssrGNonsf To* UNITED', SHOE MAGHINER`Y"7-` coni?cirugia*10N,` orI PATERsoN,

` NEW JERSEY, A ooiaronafrlon orjnnw Jansma l.Fo/ninna iaAoHinii 'i y Appieatioir ied'January ieg/'1926. serial No. 81,814.

V"This invention vkrelates to folding machines and is herein illustrated as embodied inv a articles, it is customaryy to yattach to thefbackinacli'iiiev of the type disclosed ill' applica' tion Serial No. 35,111', filed June 5, 1925,' the' name ofjJames E. McIntire, for folding themargins of covers "of book cases and* similarar-ticles over the backings upon which the coversgare mounted; y o j ,lnf'the'manufacture vof various rtypes, yof

books, rpocketbo'ols, card cases and similar ing, byfmeans of paste, cover ofleather or imitation leather the margins of which eX- tend beyond the edges of the backingyand then to apply pasteto these''margins. vandfold jthemiover upon thefadjacent marginsrof the Y backing. Forjtl'ie performance of such oper-V ations, machines of the type referredv toare provided with inechanismadapted for fold-Ly ing straight. edges and e square corners,` 'and also withmechanism adapted for folding round corners;l It isjl., objecty of the present;V invention "to provide improved 'l folding lr'i'iechanisniy i adapted forv use in p. Vapplif'zationidentified above, by the use of" which folding operations may be still further facilita-ted, and in certaink respects ythisinLA ventioi'iy consists: "in improvements; yin y' ma` i chinesof the typ'ereferred to, although various aspects thezinvention is Vnot liiniteadI machines of` the type disclosed in the to V e'n'ibodim'en-tsin such, machinesjy y In machines `of thetype shown. in the application, the round corner folding`mecha` Riem :comprises Wolss'ii'pivortf an edge.. guide entending above fsai'djsupport, a foriii-k ing plate normally held abovesaid support,

' anda folder movable over kthe top ofthe' edge guide. 'In the operation oftsuch'a ma`v chine,1the work is placed upon the work supey portwiththe projecting margin of the cover f at a corner thereof' restingupon the edge giada and iheformins Plate-s than! brought down to cause said margin .t0 'be blt Upward by the `edge guide preparatory tonbeingv folded over the forming plateby the folder.

. According to one feature y'of the present invention, there is provided a novel folding mechanism organization inf'which the work support is yieldingly mounted and held normany i with its" Sllfae substantiall with the top of the edge guide Softhattwhe'n f both thefwork and the work support down to cause the margin of the `work to be bent upward. With this construction, the work is'securely 'held during the bending upv of the margin.

aoy

*When the forming plate of a machine of" the type di'sclosedin theappli'cation referred to has been brought down in the manner described abovetobend up the margin of the `work and to clamp thebody portion ofthe work upon'the worl; support, thelfolder is caused to fold the bent margin over the edge ofthe formingfplate, the work support is lowered slightly to? relieve the pressure of the formingl plate upon vthejwork,` and the forming plateis withdrawn from `beneathl the folded over margin of the work prepara?A tory''toY the pressing of the fold. According to anotherfeatureofthe` present invention, agpresser foot for engaging thebody portion* ofy the work is associated with the forming plate, and yielding means are providedforcausing the presser foot to follow! the work support in itsl downward move'- ment so thatfthe work 'is securely heldduring the withdrawal of the forming plate.

margin of comparativelysmall oblong `book caseshaving n round corners, to improved mechanism for folding square corners and to ,presserlingers 'associated :with the straight edge foldingmechanism. n u p v *Theseand other features of the'invention including `certain details of construction and' combinations of parts willfbe described vas i embodied in an illustrative `machine l and pointed out'` in Vthe appended claims. v'

Referring now to the accompanying drawings, f

Fig.` l is a perspective of a machine 'in which the present invention is embodied;

2 is a. yvertical longitudinal section' through the machine; i

' of, Fig. 4 showing the position of parts-be- Vfore the workis operated upon and Fig.AV 5 after'-itff has beenoperated upong Figi 6 im Perspective, ofthefffoider@ of die' mechanism for folding roundk corners;

Fig. 7 kis a detail principally in section showing the mounting of the forming block; Fig. 8 isa perspective of apiece of` workshowing its condition after having been operated upon by they mechanism shownv in j Figsg'd-and'; i, v

v Fig.y 9 A1s a perspective of a square corner afterit has* been completed'bybeing folded;

V,Figs. 110,11,r12 and113 are views partly in elevationf/ andl 'partly yin section showing more l:particularly"the position of the work engaging parts of the round corner folding mechanismvduring successive stages in the folding of i a round corner, the corner, guides having been oniittedto promote clear'ness;

and., w f A LFigs,` `14, and -16 are-perspectives 'showing successive stages in the foldingof 'a com-y paratively small oblonggbook cover khaving I round corners.

` if Referring first to 14, ljand 16, the

` case ofa book comprises commonly abackingv finished icase may be free` from bunches.' lith the-*illustrated machine, work having round corners isusually presented four times, n insuccessionto round corner folding'mechanis'mgand` then :four times in success-ion .to mechanism for foldingthe straight edges,v

inthe form oftwoboards 10(7).Whichmayv be of cardboard, heavy paper or other suitablel material and a cover 200 which may be of any flexible material and is commonlyleather or imitation f leather'. There are thus fourv straight edges and four round vcorners to be folded.` Where roundcorners are desired in' the completed case, the boards are'cut withv rounded ycorners and the coverwith similar-1 lyfrounded corners, the margin of the cover projecting beyond the edges of the boards; and when a corner of the cover is folded over acorner 'of a board, the corner Vof the cover` yshould be plaitedas evenly as possible, as indicated at 30() inorder that the cornerfof the although, as will 4presently appear, yif the work is small enough, the round corner fold-n l ingmechanism may roperate to do all the folding, the-cases illustrated in lr"igs.1l1t'or 16 be f s ing small ones adapted to be foldedentirely by the, round corner folding mechanism; Referring to Figs. 1, 6,77 and 10 to 13, the construction and mode .of operation of the roundcor'ner folding mechanism Willbe described. VThis mechanism comprises a work support 15,1wh1ch 1s generally triangular lin shape; an edge guide 17 having two faces which include between them an angle equal to the angle included between thetwostraight yedges of ka board 100 which are' adjacent to ai round` corner thereof, and a'folder" `19 .having two faces which'include between them a somewhat smaller angle. The angularly ar- V ranged faces of the Vedge/guide 17v are conf ncctedby a face which is'curved to co'rrespond toithe curve of theipundY corners *oflthe boards 100,1and they adj acent'edge offthe work support 15`is curvedin the samenianner at the'fjunction of its two. angularlyarranged faces, whilethe Ycurvejat thejunction of the 'twoangularly arranged faces of the folder 19 is a'recess 20 for@ rurreserresentlyt@ be de* scribed..-

I .c lNormally locatedin spaced relation above theworksupport 15` is a generallytriangular formingplate 21 Yhaving an outline lcorref spondingto that of .thework support 15, said formingplatebeingfast tov the lower end ofA f a bracket 23; 'A forming block `2.5,'hichY co? yoperates-with the folder to ensure that even'- ly spaced plaits shall be formed, is fast to one end of a rod 27 .which is slidablyv mounted in a block 28 pivoted at29-to the' bracket 2 3 which is forkedtoreceive it, a spring'31 (Fig.

2) connected at one'end to a pin in the bracket 23 andL-at the other end `toa pin in theblock S28 tending at all ,times to swingthe block in a l'clockwise direction about its pivot 2 9@v A- stop screw 33 .threaded throi'igh a-*lugjon the upper part of the lblock 28 contacts with the bracket 23 and therebydeterniines theV ingular position inf which the blockQS is held. The forming block l25 is urged at'all times to the right, as viewed in Figs. iOto 13,'by a coiled spring and is limited'inthis movementv by a stop 87(Fig. 7), which is split at Aits lower `portion and fastened by. a pinch screw 38'to the split stemof an adjusting nut 41. Slidable through vthe block 28 and -i threaded ,through the,l nut 41'is'a rod 39 the outer end of which is threaded through and projects b'eyondthe forming block for a purpose presently to be described. Vfhen it.- is desired to adjust the forming block 25 forf ward or backover the forming. plate 21rupon 1 which .it`rests, the ,pinch `screw38 isloosened andthe nut 41 turned. Whenit is desiredto los causethefend ofthe rod l39y top rejectfartherV i or less beyond kthe plaiting tool,fthe"pinch .i Y i screwis loosened and the rodfgturnedto Screw it' through .the 'nur' 41 au are farming' block." Y r r s. v

lIn the operation' of the machine a piece of work having round corners is presented to r the kcorner folding `mechanis1n four times, once for each corner Vand is presented. four timesto the straight edge folding mechanism, presently yto be described, once for yeach straight edge. f In order to facilitate the proper location of the work when the round corners are kpresented to the cornerv folding wrange;

mechanism, twocorn'er gnides't are provided.

.These two corner guides are first liftedl tok Vpermit the marginoffthe 'Work ata corner Y* `thereofto beA pushed beneath them and. are

th'enpermitted to fall. The operator then manipulates the work so Vas to causethe edges' of the4 board adjacent to the Around corners thereof to be engaged-bytliese corner guides.

'Y Up to this time v.theforming `plate '214 and '1o'V Y Y operative positions,-invwhichv theyfcome to rforming block Vhave been in their raised, in?

y "rest,1.asshown in Fig.A '2. 1 The formingplate and forming block are nowbrought down `.so as toniove through 'the position shown in Fig. 10 to the positionshown in Fig. 11. In Fig. V10 it will be noted that `the upper face of the work support or table 15 vis flush with the uppersurfacefof the edge guide 17V,

s n this relative position of parts providinga,

.smooth surface upon which to lay the corner ofthe'work with the margin ofthe ycover 200 extending over the edgeguide 17. l The work Y table 115, "however, y is supportedy by a'. yspring pressed plunger its initial position' with its upper vsurfacefiush withlthat` ofthe edge l guide y17 being determined by a stop yscrew 47.45 Consequently, asthe vforming plate E21 moves do'wn: to the position shown in Fig.' 11, v,the marginfof the'cover is bent up above theV surface of theedge'fguide 17 "into fthe pathv of the"` folder '19., It should be'noted thatv the descending .-formingiplate rst `presses the workagainstthe work lsupport andthat lthe work" is'jfirmly held as itv is y .y pusheddown to causethe margin of the cover' tojbe bent up;- nasi-nuchasthe work is thus g fimnlyclamped it is prevented from slippingyaway from theedgeguida'and the margin of '.thelcover is .thusbent 'sharplyrabout the edge/:ofthe board.' The folder 19 now moves forward. As it starts its forward movement,- the corner guides, having served their 'purpose,are raised out of the pathof the folder and remain inraised position until the folder has returned to its," initial position.'` In its f'forward movement the--folder gathersthe Y upstanding margin about the forming'bloclzj 25, the'ypositionof parts `when thisr has oc# curred being `shownfin*llig. 12. -At thisr stage in the forward movement of thejfolder anfabutment 49, which is fastened to a slide toi which the folder is fastened, engagestheendof `the rod 39's() that, during the ref mainder the "forward movement" of ythe'v hfolder, the forming block 25fmoves in unison With-Kit. The spacev between the forming' Vlolclrand the folderV is so predetermined the adjusted Vposition of the rod 39 with re spect Vtothe forming block) that a pull isV exerted: upon the margin as it drags between tliejforming block" and the folder. Continuing its forward .niovemenh thefolder bends-themargin ofthe cover 200 over the margin of the forming plate`21;` the wei-lt" f" support is then loweredslightly to release'the pressure, after whichthe formingplate is withdrawn: fromr beneathgthe folded over margin as :Shown:` invFig.` 13. Thefolder no'wlipauses whilethe work support '15 is raised. to press the fold.` against the under sideufofthe folder,"after which `the 'work` suppport is lowered, and the yfolder,l'forin- 4ing block, forming plate,corner guides and' work"support return toand come to rest 1nv thev positions shownin Fig. 2. In order to holdthe work iirmly'uponthe work support,

particularly during fthe `withdrawal of the forn'iing rplate 21-fro`m beneathfthe folded over'margin ofthe coveiga presser foot 51' is mounted at the lower ends of stems r53 whichpass through slots (see Fig. 1') in the forming plate 21,r thesestems being carried at the outer ends of curved arms (Fig. 13), the othery ends of which'are adjustably heldin pinch bearings formedlin brackets 57 which are fastened to the pivoted arm 59,`

presently to be described, by which the forni-` ing fblocl; andforming plateare indirectly carried.A n.,

, Attention Vis directedparticularly to the coo'perativeaction ofthe forming block and;

the folder. During `the Vfolding 'operation the'lower portion of the margin extends upwardly and slightly inwardly, while the up-' per portion of the margin is flared upwardly (Fig. 12). Whenthe margin is thus gath-I ered about thevformingblocl and gripped between Vthe forming block and folder any puckers which may be present in it are small yand lsubstantially evenly' spaced, whether such puckers lare present depending' some-y what upon they stiffness l of the ymaterial `of which the margin is made? As the folder and the forming blockmo'v'e forwardand the margin 'is folded down fiat upon the forming plate, the small evenly spaced puclrers (if they are present) are attened into small evenly spaced plaits..` If substantially no puckers' are 'present `in the upstanding man gin, then small evenlyspaced puckers are formed progressively as the folder movesfor-` ward, andthese small puckers are progres-y sively flattened.l ln,y eithery case an evenly plaitefd finishedfold results. If no forming block or other means isprovided for supporting theunfolded portion of the marginduringthe foldingoperation, the unfolded por-` tion of the margin will be bent 'down to some eXtentin advance of the folder; yand comparf ward into the yposition shown in Fig. 12, the

edge of the v.recess 20 inthe folder gathers. the margin of the cover about the forming block *but no portion, or at most onlya small'porl' tion, of the margin is bent down ytoward vthe folded in the manner describedabove in foury forming plate.A Inorderto ensure that thereA `shall be a pull upon the margin during the foldingoperation, the forming block andthe rod39 are so adjusted :that the space between rthe forming block and the folder, during the folding over'of the .,margin, is just :sucientg to permitthe marginto be ydragged between mf them; Y

Afterk the. four round cornersihaveibeen tened to a rib 67'formed on the folderfv by i' means of set screws 62 are a plurality of Y spring fingers 69 which act to bend the. margin of the cover over the backing whenthe work is placed rupon thework support Eiland pushed toward the'rear of the machine so as to' bring thestraight edge of the work int-o contact with theedgeguide 63. The` operation ofthe straight edge folding mechanism is as follows: The folder moves forward toy fold the margin ofthe cover over` the backing, the worksupport v61 first rises topress vthefold and then moves slightly downward to relieve the pressure, the folderis withdrawn, and the parts come to rest in they posif ofthe coverfmay be presented beneaththem Y tions shown in Fig. 2.

' tion will now be given.4

rlhe general constructionand. mode of opf. yeration of the machine `having been outlined above, a detailed description ofy its construc- Referring more particularlyto Fig. 2., the

-work support 61 of the straight edge fnldingl f" mechanism isfast to abracket 71 which is `adjustablyfastened by a cap screw 73 to; a

casting 75, an adjusting screw 77 being provided to adjust the 'table vertically with respect to the casting. The casting is verticallyV slidable inguideways'formed in the frame of the machine; and the work support 15 of the corner folding 'me'chanismhas its' stem 79 extending into a socket in the saine `casting .and lfastened loosely in placebya screw 811 U which is threaded throughuaawall ofthe socket and extends into a grooveinthestem 79. The work support 15, as has` been eX-,

plained, is urged upward at all times with respect to the casting by the spring pressed plunger 45 as far as the stop screw -lfr'jwill permit ,the groove in the stem 7 9 permitting' such movement.- `When, as has been vez:-

plained,the work is placed upon the workl support and downward pressure applied, the

' work support is pushed down until the screw k81 engages the upper-wall ofthe groove in the .Y

stem79`.y The, castingy75 rests upontwoVK heavy springs Vone ofwhi'cliisshown a.t.,83,V

the lower end of the springsresting upon.

nuts one of whichis shown at, the nuts'V being threaded upon plunger-s,v one of :which i is shown at 87.' rEhe plungers rest rupon a plater89whichis supported by abar 9.1 piv-sk otedat its" ends to theoutniv ends vof thearms Y v ofa forked lever193, said lever being mounted on a shaft 95 the ends'of which are rotatable in alinedbearings in thefr'ame of the ma-v Chine.Y The end of the lever 93 remote from the bar 91 carries a roll 97which1runs cna cam 99 carried` by a cam shaftalOl. A spring pressed-plunger 103 carried bythe frame of the machine ensures that thev roll-97jshall at all timesbe held againstthe camv 99. Vith this construction, during arevolutionof the shaft 101, the two tables, lland 15, willzbe movedwin unison in the manner i'vhich has The treadle .controlled mechanism for -parting'onerevolution tothe-.shaft 101v and Y for bringing it toi/rest in theipo'sition illus-,-V

trate'd has'not been shownsinceany suitable mechanism maybe employed.' PreferablyY the one-revolution clutch whichfc'onnects the cain shaft l101 with thel driving shaft (not shown) is 4of lthe toe andaheel type,-"depres sion of the toe end/of the treadle serving to control the clutch, the heel endfoffthe rtreadle being adapted whenL depressed .to push upward the rod 105 ig. '1) -toraise the corner guides L13. In the operation of the machine the heelend of thetreadle is first depressed to raise the corner guidesso that the margin L and is then released t-o'permit the corner guides to fall. Afterth'e work has been manipulated by the `operator to locate it vp'roperly with'respectl tofthese corner guides, the

toe end of thetreadle is depressed to impart` one revolutionl to the cam `shaft-101. f A

The corner guides 43, which normally oc-k cupy the position shown inl Figs. V1, 2and 3,V are fast tothe outer ends of the arms of a. forked member 107. The stein of this forked A member has agroove at'its rear end (Fig. 2)

. to receive a small v'rockshaft 109 whichisro f tatable in fixed-bearings. Located one' yon, Y j each side of the stem are twolarm'sal-l'l, 113

Y11o Y (Fig.v 1)- the hubs 'ofwhich arefast'tothe@y I' ed into thek arm 111, so thatthe three meinl bers arerigid with each other and with the rockshaft 10,9 when this screw bolt is tightened. Vhen, however, the screwV bolt has it thejcorner guides L13n may be adjusted forward or baek'to position the corner guides las ,been` loosened, the forkedmember, and with Y plioperlyfx In `order to.l facilitate "such ady c ]ustment,'a second screw bolt117 carriedby the arm `113 has at its endfa small yeccentricl 119 whichgisreceived in aslotinithe stem of the forked member 107sA rEhe rock shaft 109 vhas `fastat one end armj121gwith theunder face ofthe *outerl end; of which the vupper end of the rofd105 isfadaptedto .con-` tact..` Them therefore,` therod 105.is1pushed up vby. depressing the heelendfofhtheheelf and-toe treadle referred tcfabove'the ,corner kguides are mi'sedtopermit: thework tobe' presented beneath them, andwhe'n, the heel Send ofthe treadle is-released,'a spring123 pushes the-:rod 105 'j'downf and.v permits the corner guides to fall intothe position shown.

The' one-revolution clutch is' then thrownv in i byde'pressing the toe; end ofthe treadle; and the folding operation,` shown in Figs. 10l to 113, then ensues. During thisfoperation :the folder moves forward and Vwould strike the corner guides ifwthe'y werenot raisedand held raised.v In .order toraisethe guides and :hold them'V raisedfduring the forward and vba'cltvfvard movement `o'f-thelfolder there is' Vfastto the folder slidea cain block 125 (Fig.

3) having a Abeveled .forward end V.which moveslbeneath a horizontalroll 127 carried Y c n by one army of the forked memberrv107g, In

'order to determine` the, 5 lOWermost position I Vwhich the corner kguides will occupy when f bears against a lug 133y the hub of which` is 1' theyare free tof'all, afset screw 129 threaded through an Aarin of the forked inember-107 contacts` with the frame ofthe 4machine.ln order to'` urge the corner vguides:downward at `all times, a spring .pressed plunger 131 Y lfastened -to the rock shafti1p09. i j

Y' slidablehorizontally in suitable ways formed Formed on the underside of the slide is a slot 1.37 in which is i received-a roll 1'39'fcarried at the upper end of a leve?.l 141 which is pivoted to the frameofv theV machine at 143 andcarries a second roll,

` Turningnnow tolt-hetwo' folders7 that for the round corners :and thatpfor the straight edges, vthe corner folder slide 135 (Fig. 2) yis in theframe lof the machine,

f which runs asuitablefcarn track 147 formed in av cam fast tothe shaft101. `r lfhe track is so shapedthatwhen one yrevolution is imparted to the rcam shaft', the corner fold er 19, which is fast vto theslide 135, isy moved forward into the position shown in .Fig-13, 'remains in that position whilethe foldis bef y Y ing pressed and then returns to its initial position shown in Fig. 10. Lj Thefolder of the straight edge folding mechanism-is con# ,nect-edto the slide 135 by a pin 149 and thus j partakes of the movement of the'slidaf (iifl.

' ating` the forming 'plate 21 andthe forming Turning now tothe mechanism for operblock 25-(Figs. 1, 2 and 3) the bracket 23 by I lwhich these members are carried is'slidably 'mounted upon a sleeve151 therear end .of which atjits lower portion is split "andproT .y

holds the sleeve adjustably upon the outer reduced end portion of a rod 155. Through the upper portion of vthe bracket 23 passes loosely a screw bolt 157 the endof which is threaded vinto Ya split lug159y integral with thesleeve 151. The screw f bolt is` rotatabley in the bracket 23 but held from longitudinal movement `with respect thereto b 'the head of the screw"and a., n'utf 161. bonsequently,` by

turningthe screw bolt, the bracket 23 may be adjusted'lforwardand back. A. pinch screw 163 holds the screw bolt157in adjusted posit-ion. yThe rod 155'is slidably mounted vin the arm 59 and has .at its rear end ai roll 167 which is received in an arcuate cam track 169 formed at theupper 'end ofy a lever` 171.

115i coiled spring 173 :located between theouter Y. end of the arm 59and a collary 175 on the rod ,y

155 prevents chattering ofthe roll 167 in the camy track 169.* The arm 59 at itsrear end Ais forked'Y and the yforks terminate res`pecf-v tively in hubs 177,179 whichareffa's't to alined rock shafts one of which is'A shown at'181 (Fig.`3) rotatably lmounted' in the frame ,of the machine, said rock shafts each havinga coniclal recess in its outerend to'receive respectively'the conical inner ends of bearin s'crews'183, 185.` The arm 59 is lowered and raisedbymeans of a lever 187 pivoted on one f vided with apinch screw 153 `(Fig.v 12) which of the rockshafts 181 and having at its lower f end a roll 188 which -runs on a cam 189. 'A comparatively heavyY coiled spring 191 holds therroll in contact lWiththe cam, said spring surrounding a rod^192 one end of whichis slidablethrough a lug 194 formed on 3the lever 187 and the other endl of'which extends *I into asocket formed inthe frame of the machine. yA' screwkk 193'y threaded through the base of the sockety and engaging the head of the rod furnishes means for varying the tension of the spring191. vThe upper end ofthe lever 187 has formed thereon a hub 195Which is normally` iny alinernent with.` a hub 197 formed atthe upper end of the upright arm of a bell crank lever 199; and a spring presed locking pin7201,y extending through vthe two hubs, "causes the swingingfmovementsfof the lever 187.` tobe imparted to the bell crank lever199. i The pin 201 has fixed in its sideia small pinl 203 normally `received in a slot in n'ection it'should be noted that a coverplate 205 has at. its rear end upstanding lugs which are pivoted about the alined rock shafts.- 181, and that, when 4the screw bolts 207 ,It which hold the 1 cover plate down5 have been re? movedythe.' cover plate may be `swung up" to give access tothe'two folders 19 andand to Y the work support 15'.y j Y f! Thebell., crank lever 199 is connected with thearm `59 'in the following manner. Re'- ferring more-particularly to Fig. 1, the arml '2.01,'ha's' its middle portionthreaded through' thevblock. n The head' at the upper endfof the cap screw 213 and nuts215 at thelower. end

hold the cap screwfromlongitudinal move#k 1 ment. The .block 2111*,is split, as shown,andf

a pinch. screw 217 holds .the cap screw 213 from? turning.

199. The block is normallyheld downrin Contact with theupper'face of-the lower fork vbya'- spring pressed. plunger 219k which, to-" ygetherwith its spring, is mounted liii-a vv erf ticalfbore in the upper forln'an. adjusting screwV 221 being providedl for varying the tension of the spring; and a `set* screw 223 determines the'. extent to vwhich'the block is permitted torisezagainstV the action ofthe spring.` vThe purpose ofthissconnection between the arm 59 `and thebell crank lever 199,v which has just been described, is to 'permit adjustmentjofthe position; off/the arm 59l soL as to predetermine the position `which the'formingrfplate 21 Vand presser; foot 51 will occupy-when the arm 59 islswungdown` and "to ensurefthat the formingvplate and presser foot willf'ollow the work down when thefw'ork table is moved down slightly just prior to the withdrawal of the forming plate from beneath the folded over margin.` The adjustment of the arm 59 is-accomplished by turning the.` cap screw 213.v This tends, of course, Vto raise. or lower the 'blockg,211,` but,

inasmuch as the block is heldl stationary at f this time between the spring pressedrplunger 21f9and `the lower fork of the bell crank lever 199,'the'a'rm 59isswung up or' down. Turn- Ving now to' the action of the .spring pressed plunger219 at the time the worktablev 15` is lowered slightly just prior to thefwithdrawal ofthe formingvplate'21 from' beneath the;

folded overllmargin' of ,the cover, when the arm l187 .(Fig. 2) is swung in acounter-l clockwisedirection by: the rotation of `the cam: 189 in the direction'indicated by the arrow, the horizontal armof "the bell crank Y lever 199 (Fig. 1): is swung down and,

through'the block 211, swings the arm 59;

down with it. Inv the course ofithis downward movementthe forming'lplate 21- and" presser 51" first contact with theV work,=`as shown :in-Fig. 10,'and then push 'thel work and the work supportl downinto theposi-KV tion shown inFigs. 11 and 12. In-,the course of thisfmoveinent the set screw 223 is brought rIhe block 211 also extendsv between upper and lowerjforks at the end of the'horizontal'arm ofthe bellcrank lever into contact'with the block 211 VVand thegeompressionfof the-spring which backs up the'. j spring Ypressed plunger 219 'is increased.v Consequentlywhenthereaftery the work table i 15 vis'lowered slightly to relieve the pressure i upon they Workf'preparatory to the with@ g drawal lofthe-forming vplate to, the position vshown in Fig.l 13, the'spring pressed plunger causes theforming plate and presserto follow the work down so that thepresser holds thewvorksecurely while the forming plate is'being withdrawn 'from beneath-the folded `over margin of the cover.

As thus farV described, ythe ln'fiachine is adapt'ed'tobe used for vfolding book cases vand similar articles` having rounded corners.

The machineis alsoV adapted to fold bookf .y cases' andsimilar articles having square coifners and to thisend isprovided with mechanism associatedywith the-straight edge fold# ing mechanism forperformingone step in thefolding of a square corner.l 'Referring to- Fige, there isshown a piece. of work-coinprisinga-portionof the b'oardeOOand cover 500 of a squarecornered bookcase.

rlie' work has been placed upon theiwork table'hlv and pushed` forward untilthe margin` of theV .cover 500 has been bent viover'fson'e-l edge of'thebacking 100. As the folder 65 (Fig. .y 1) moves forward, this margin will be drawn tightly about the edge of the Vboardr and bentv 'down further; and, whensthe work support rises,the bent over kmargin will be pressed Y iirmly'against and stuck'to the board.y The end portion 600of the foldedover i'nargin has .f

no board beneath it and extends/over ad jacent margin which is presently to be folded Y Aover the edge ZOO ofthe'board to complete lthe foldingofthe corner. There areth'us at the cornervtwo'thicknesses of tlie'margin; and these two thicknesses at `this localityare lif ablev to cause they completely folded corner to" vbe somewhat. buhchy. 1n order to I avoid this undesirable-result, mechanism is provided forpressing' thelend .portionOO'of Lg' y the margindown upon'the portion'or" the margin directly beneath iti in' the manner shown in Figsf andl 9.'l Tothis endtneV v n,

work is presentedto thestraight edge fold# ing'jnecha'nism withthe edge C700 of the board I j in line with theA extreme righthand end of the straightedgelfolder 65; and apresser 225,

which is normally inthe'position shownin y' 4 is rotated into lthe. position' shown in Fighto force the portion'hOO'ofthe margin lf p down upon-that portion of themargin which is directly beneathit andpin'doing so, to bend the portion (SOOdown over 'the edgeOO of the board'in the manner shown best inFig,

8.y This bending down 'the portion 39() over the edge FOOcauses the edge 300 "of the;

portion @OO to lie somewhat inside the edge 900 as shown. Vfhen now theiwork, inthe condition shown in Fig. 8, is turned903 and presented again tothe' straight edge folding ',mechani'sm, af neatly formed, lsub Staiitially y smoothfolded corner results-as shown infFig.v Y 9J Two' pressers 225, 325 are preiiided, one at eachV "end "of" the straight edgek felder G so'as to permit the four corners cfa piece ofy iwork to be ,operated upon in substantially thesame manner.V These fold presse-rs are y 'fast respectively to shafts22, y3,227 rotatable inv bearings 4carried by fblecls229, 32.9, Said fbloclrszbeing.adjustable horizontally in the u framejof. lthe'machi'ne and heldin 'adjusted l positionby cap screws 231, 331 which pass through vslots inthe blocks'and arefthrezuledll f into the .'frame. Integral respectively. with vvvjfthefpressersl 225, 825 arepinions 233, 333 P arv'liich mesh .Y respectively fu/ith segmental raclsf2'35, 335 carried yat the 'outer' ends of Varms 2,37*, 337, theehubs of-said arms being fast to afrocklshaft 239jmounted in alined cfbearingsl in the Vframe of ythe machine.y Y Fast to'themiddle portion of saidrocli shaft (Fig.

` 1" 12)'isa slotted arm 241 into the'slot in which extends a rectangularblock pivoted at243 being shaped to cause'thepressers'225, 825 3c to rotate fromthe `position shown in Fig. 4

to` thatl shown'in Fig.` 5. during the4 folding 'than yhalf ofthemargin between a and and f something morey than half ofthe margin between a andai, has also been folded.' InFig.

15, kthe-corner b hasfbeen vfolded and at the W same time thefolding of themargin between movement of the straight edge folder y65.'

Vhe'n a# iece i of. worli having square cor- Vnersv is 'to e folded, the work' is presented Vfirst in the manner shown yin 4 to cause one straight ledgefto be folded andcone end y portion of themarginv (the portion 60.0 in Fig. y f .4) to be bent down overy oneedge of tlieboard into thev position shownin Fig.' 8.'n yAfter the completion of this operation, the.: work .is movedto the left and the'y fold .presser caused tov operate upon theleft-.hand end por- :tionyo'f the margin in a similar manner. The worlris then turned through 180,01 and the oppOSite'margin; after vwhich the remaining twostraightfedg'esare presentedin succession vtothestraight 4'edgefolding mechanism. Slt" hasfbe'en stated,aboveffthatthe y'four vstraight edges lofl comparatively small vpieces lfof work may be vf'olded'by therou'nd cornerk Y folding mechanism simultaneously with the folding-ofthe four rounded corners; If thek I sufiiceito fold bothV the-corners Aand the f'l l straightedges properlyjprovided first, that 1 the Vsum-of therv lengths of the twolegsof thev folder. is ysomewhat greaterthaln the distancefrom one corner tofan adjacent corner,

and second, thatthe lengthoffeach legis somewhat less'than thisdistancef." The sum a opposite margin operateduponto:foldit and topinch or press the end portions of said of the lengths of the legs of the folder should be somewhat greater than the distance from corner to corner of the work kso as to ensure distance since otherwise, during the folding of'a corner, the two corners which are adja-l cent to the one which is beingfolded will be partially Vfoldedfin an objectionable manner by the two long legs, and neither of these twoy adjacent corners can thereafter be properly folded lby the fround ,corner folding mechai If, however, the work'is oblong, as is common, the'legs: of thefolder should not be of equal length.` With such work the legs of `the folder shouldbefof lunequallengths, one leg beingshorter than therlength of the finished workbut longerfthan half said length, and the other leg being shorter than the that the whole of the straight edge lying bef tween two corners shall be folded.

Vle'ngthof each leg should be less than this 'vm son' width of the nished Work but longer than I half said ividth. ln-the present machine oneleg of the folder 19 ismade'longer than the other as kshown in Fig. 6, so as to enable,V the round cornerfolding mechanism to fold the entire margin ofasmall piece'of work such as that shown in Figs. 14 to 16. Three stagesfin'the folding of such a piece of work are shown. In Fig. 14, the corner a has been` folded andat th'e'same time something more aand b hasbeen completed, and a portion -of the margin between b and c has been folded. "In Fig. 16, the corner c has been folded,

4the folding of the mar-gin between and c completed, andfsomewhat more than half of the margin between'c and CZ folded. When the corner cl is presented to the machine, the

folding ofthe entire margin will be completed.

`The illustrated machine is similar in many particulars to the machine shown, described name of McIntire,-which has been referred to above, and to the machines shown, described `and claimed? in applications Serial Nos.

656,557' and 729,930, filed respectively Aug. 9,

l19.23, and Aug. 4, 1924, in the name of Glass,

and the subject-matter common to these applications andto the present applicationy is notherein claimed. 7

'f Although the invention has been set forth as embodied in a particular machine, it

should'be understood that the invention is and claimedinthe application filed inthe izo Y. y .LA machine of the class described hav- 5.' Amachine oftheclass described having,

' forffmoving Vthe forming plate andforming ing, in combination, a work support having a rounded'corner, an edge guide having a contour tocorrespond to that of.v the work support, yielding means for holding-'thevvork support with Iits work supporting surface normally substantially flushv with the upper surfacefof the edge guideya forming plate and afforming block normally held above the 'work support to permit the work tobe placed uponithe work support with dthe ma'rginvvof thel work lrestingv upon the edge guide, means block v.dowiiward .whereby the work is first gripped between the work support'aiid forming plate and then' moved downward to cause tlieniargin thereof tobe bent upwardly, a folder, and means for causing theffolder to .-'gather thev corner portion.offthe'jma'rgin 'about 'the folfmlg 131001( and bend it over the yformingrg plate, .y

`2. A. machine rounded corner, an edge guidehaving a contourftocorrespond to that ofthe work/support, yielding means for holding the work support with its work supporting surface nor- `mallyat a level suflicientlyhigh to permit'the" margin of the work, when placed upon it, to

extend over the edge guide, a forming plate yhaving arounded corner, a forming block located above said 'platev adjacent to said round` ed corner and movable with saidfplate, means 'for *'causiiig thelform'ing plate and the forming block tov descend until kthe work -hasvbeen pushed-down and'its Vmargin bent up infront of the forming bloclgal folder,

and means for moving the folderto gather the corner portion of tlie'nia-r'ginaloout the forming block vand bend it overthe corner portion of the forming plate 13. Mechanism for folding themargin. of

- anoblong piece of work having,`in 'combinafor voperating `said folder. y

tion, asupport for the work, a folder having legs of unequal length, one leg being shorter than the width of the finished work but longer ythanjhalf said width, `the other leg being shorter than the length ofl thefinished work butlon'er than lia-lf said length,`and means 1.50 i

,4. Mechanismj for lfolding thefmargnj of the cover of an oblongbook case over the straight edges and the rounded Vcornersvof the y backing tliereof.having,`jin combination, a

work support having an outline correspond-` v the width of the backing but longer than one,-

lialf said width, thev other leg being: vshorter than the length of the A.backing but-longer than one-half said length, and meansfor opl,

- f of theedge guide for bendingthe marginlof Y erating saidA folder. f f g.

Y Y ofthe yclassl described having,

lin combination, a work support 'having av port.r Y

'in combination, a support'forethe-work, an edge guide, a'folder, a forming plate, a inemberto which the forming-p'late'is fastened, a

forming .block llocated above. the forming,-

plate, a Vforming :blocklcarrier pivotedfto the member, meansfor lowering theV member to bring the forming plateV into rcontact with a piecefofworkl on thework support and to. cause the' ymargiiiof the' worki'to be [bent upwardly, and means'fz'or operatingthe folder; .A

6. A machine of the class described having,

in combii'iatioinawork support, a 'forming plate adapted tofbe brought downlupon the g work to hold.l it fupon 'thek support fwliile thek margin ofthe work is bent over the margin ofthe pla-te to form-a foldiand to'be moved 'in a direction f substantiallyk parallel to ythe surface ofthe work support to'withdraw its margin from beneath the bentover margin of the work, means fory loweringy the f work support" prior to such withdrawal, aA

presser foot Aadapted to hold the-work upon the work support, andyielding .meansafor causing the presser foot ,to follow the work support in itsl downward movement. 1

"7. A machine'of the class describedhaving, n

iii-fcombination, asupport for theY work, an

edge guide to which a'pieceof work compris;'

ing a backing and a cover may'bepresented in such manner as to bend the margin ofthe cover upward, a folderarranged to move over n the edgeguide, andA aplurality vof vfing-ers Y mounted on the folder and extending over the)I v l yedge guide and the work support.. Y

8;. A machine ofthe clas'sdescribed'having, in combination, aisupport for thelwo'rk, -an

edge guide to which apiece of work comprisf ing a backingrand a cover maybe presented f' in such manner as to bend the margin kof the cover upward, a folder arrangedto move over the edge guide, fand a plurali-tyv of fingers adjustably mounted on the folder and eXtending over the edge guide and thezwork sup-V 9. A machine. of the. class'de'scribed having,

edge'guideto whichafpiece ofl work compris-1 ingajbacking-and, afc'ove'r maybe presented f in suchmanne'r as tobend the margin of the coverupward,- a Vfolder arranged to move' lovertlie edge guide,can`d a plurality of yieldling fingers mounted on` the folder and extendan edge guide tofwhicli a piece of work comkin'f'combination,asupport for thework, an

prisingy a backingand -a cover. maybe prefV ksented in such manner as to bend the margin of the cover upward,a folderV n'ormallylo-y cated in the rear of the edge guide and adapted tobe-moved Vover it, andameans carried vby the folderand normally extending Vin front the cover over the backing when the work Vis presented to the edge guide.

11. -A machine of the class described having, in combination, a work support having a rounded corner, an edge guide havinga eont tourto correspond to that of the work support, yielding means for holding the' work 4 vsupport with its work supporting surface.y

normally substantially flush with the upper surface of the edge guide, a presser member and a forming block normally held above the Y "work support tovpermit the work tojbe placed Y i ing block downward whereby the body p0rupon-the work support with the margin of 'the work resting upon the edge guide, means for moving the presser member and the formtion ofthe work is moved down to cause the margin thereof to be bent upwardly, a folder,

\ and means for Causing the folder to gather theeorner portion of the margin about the forming block and bend it over the body portion thereof.

In testimony whereof we have signed our names, to this speeiieation.

PERLEY R. GLASS( lJAMES E. MCINTIRE.

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