US1776389A - Folding machine - Google Patents

Description

Sept. 23, 1930; J. E. M IN T IRE FOLDING MACHINE Filed June 5, 1925 3 Sheets-Sheet l Sept. 23, 1930. J. E. MCINTIRE 1,776,389

FOLDING MACHINE Filed June 5, 1925 3 Sheets-Sheet 2 Sept. 23, 1930. J, Mc lNTlRE 1,776,389

FOLDING MACHINE Filed June 5, 1925 3 Sheets$heet 3 wen 4558* 7 Patented Sept. 23, 1930 JAMES E. Mommies; or rnanonv, MASSACHUSETTS; nssrenon T UNITED SHOE MA- CHINERY CORPOILS'IION', 0F PATEBSQN, NEW JERSEY, A CORPORATION OF NEW H .lApplic ationifiled June '5,

a This invention relates to folding machines and is herein illustrated as embodied in a 'yond the edgesof the backing; and then to apply?" paste to these marginsv and fold them r over upon the adj acentmargins of the back ing. The corners of'covers of the kindre .ferred to are commonly of two types,

' rounded and square theppresent invention being concerned more particularly vwith the folding of covers the corners of which are rounded. Such cornerssshould be evenly plaited so'that thefolded-over margin may be as fiat as possible and the folded edge have asmoothcontour. l I

- In order to ensure such even plaiting there are provided, aecor'ding'to one feature of the invention, a vwork upport, a forming block and a folder; the tw'olast-narned 'elements being adapted in the illustrated ma chine to move in a path which is substantially parallel tolthe surface of the work support and, to grip between theinthesmall I e -reniy puck-ere which formed 'WllBIl the folder gathers the marg1nof the work about the block, and thus to prevent the puckers from becoming displaced and thereby resulting in uneven plaits in the finished work In the illustrated machine, the work isplaced upon the work support and the margin at a corner thereofbent up 'wardly, said upstanding margin ly1ng,be-

" tween the block and the folder." The folder then moves over the work support and in so doing first gathers the corner of the cover I about the rounded face oft-he block thereby forming small, evenly spaced puckers in said margin and pressing the puckered mar- Tl FOLDING MACHINE 1925. Serial no. 35,1i1.

gin'against the bloclr. Thereafter, as the folder continues its movement-to fold the margin over the body portion of'fthe cover,

movementin the same direction as the folder, is pushed along by the folder and continues to exert pressure allth'etime'upon the puckered margin so as 'toprevent' the puckers frombecoming displaced andun even. With this construction and mode'of operation the smallyevenly spaced pucker's are converted into small, evenly Spaced laits so thatthe" foldedover margin is as at as possible and the folded edge has a smooth contour. i a I 'f The round cornered boards or backings used vary greatly in stiffness. When such board is made of cardboard or other stiff material, it is possibleto fold the margin of the cover directly over, the edge of the board; but, when the board is thin and weak, it is difficult to make asatisfacto'ry' fold in this manner. According, therefore; to another feature of the invention, aformer, which may be a thin suitably shaped plate, is iprovided over which the margin of the cover imay'befolded. to define the line of fold the a forming block being: mounted for sliding movement in; a path substantially parallel tothe surface of the forming plate.

These and other features of the invention will be described as embodied in an illustra tive machine and poin'ted outin" the appended claims. I e Referring now tothe accompanying draw ings,1- a r a Figure 1 is a perspective of'a machine. in which the present invention is embodied; and Figures 2 to 12 inclusive are perspectives of the work-engaging parts of the machine in various positions which they occupyduring the operation of the machine, a piece of Work being shownin each instance in process of being operated upon.

, the block, which is yieldinglyinounted for Referring first to Figs. 2 to 12, the illustrative machine is particularly adapted to the I folding of the covers of book cases and similar articles having rounded corners, such work commonly comprising a backing-100 of cardboard paper or other suitable material and acover 200 of flexible material which is commonly leather, imitation leather or cloth, the cover beinglarger than the backing so that itsmargin, projects beyond the edge of the backing; A coating of paste is applied to this projecting margin, after which the margin is folded over and pressed down upon the margin ofthebacking'. Where rounded cornersiaredesired, the backing is cut with rounded corners and the cover with similarly rounded corners or with partiallyrcut odsquare corners and, when the corner of such a cover is folded overthe corner of such a backmg,the corner of the cover should be and a straigd1tthe and a folder 15. The'cornerfoldgular table 17,;a folder 19, a forming plate 21,'in' the form of athin, generally-trianguflar plate, and a forming block 23. "lnzthe operation of the machine, the'corner of the work is pl'ace'd upon'the table 17 withthe projecting margin ofthej cover extending over' an' edge guide and with'the work proper-1y l'ocate'd fby corner guides 27 which may engage the straight edges of therback-i ing adjacent to the corner. These corner guides may be first raised to permit the mar gin of the cover to be thrust beneath them and thenallowedjto fall, so that the work may be 'properly located by causing the guides to engage the straight edges of the backing adjacent to thecorner. The forming plate'21 is brought down by "a treadle to press thework firmly upon the t'able17 and thereby to "cause the projecting margin 7 of the/cover to be bent upwardly, .and then acne-revolution clutch is rendered operatiVe with the follo r u "T f 19 moves forwardlto fold the upwardly bent margin of the corner of the cover overthe edge of thefforming plate 21, the forming plate is withdrawn from beneath the'folded over margin of the cover,,andthe table 1'? rises to press the foldagainst the under surface of the folder, "The parts then return to the positions shown. After the corners of I the 'coverhave been folded in succession, the J straight edges are presented in succession upon the table '13, and the. straight-edge The folder115 folds over the margin of the cover after which the table 13 rises toypress the fold. As thus far described, the machine is substantially the same as that disclosed in application Ser. No. 729,930,,filed Aug. 4,

detail in connection. more particularly with Figures 2 to 12from which the corner guides 27 have been omittedto promote clearness.

Figures 2 and 3 show the work as it appears just after theforming plate 21 has descended to cause the margin of the cover 200 to ffbei bent upwardly." Ihe two parts of thefolder 19 then swing toward each other aboutthcir pivots 29' and simultaneously move forward to gather the corner of the cover in small, evenly spaced puckers about the forming block23, this gathering taking place progressively. In the position ofparts shown in Figures 4 and 5, the parts of the folder 19 have swung towardeach other to anzex tent and moved forward sufficiently to cause the upstanding margin at the corner of the cover to approach fairly close to the reduced lower portion of the block: In the position of parts shown in Figures 6 and '7, theparts of the folder haveswungcompletely together I V and moved forward sufficiently to gatherthe corner of themarginof the cover about and press it firmly against'the' block. It should be notedt-hat the block 23 is normally 10-;

cated near the rounded'forward end of the.

forming plateQl and has a convex'rounded surface-about whicha concave complemental recess in the folder19 gathers the upstanding marginofthe coverwhen{ the parts'reach; the positions shown inFigures 6 and"? to form the small, evenlyspaced puckers which have been referred to above. As the folder.

continues to move forward into its succes-' sive positions, one of which is shown in Figures '8 and 9, the margin of the'fcover is folded over the edge of the forming plate 21, theblock -23--being pushed to" the left against the force'of a spring 31. During this folding of the marginover the edge of the forming plate the, margin is gripped yieldingly between the: block and thefolder so that'the.

puckered margin, which resulted from the movement of the folder into the position shown in Figures 6 and 7, is drawnor dragged between the opposed gripping sur face'sof the forming block-and the folder. After the folding of the margin of thecorner of the cover over the formingplate has been completed, the formingplate is with drawn from beneath thGfOldBCl- OVB I margin as shown in Figures 10 and 11. Thetable 17 then rises to press the fold againstthe under side of thefolder 19, the forming plate 21, and

with new block 23, is'raised to initialpo V I sition, and the machine comes to rest with theparts inthe positions shownin Figure 2;

. '70 1924, in the nameof Glass and owned by the a I When the margin at the corner of the cover is gathered about the block 23in the manner shown in Figuresfi. and.7,- puckers are formed, as has been explainedfwhich are sinall and substantially evenly spaced; and thesepuckers: are prevented fromabecoming disarrange'd during the folding operation by reason of.

the fact that they are grippedbetween the block and the foldenduring the completion ofthe folding operation in theimanner which .has been described. i I

It hasbeen stated above that smalleven'ly spacedpuckersare formed in the margin of the work when said margin is gathered about the :forming block by thefolderr In the illustrated construction of forming block which iisiparticularly adapted to leather coversitfwillrbe notedthat this block has'not only a rounded portion which facesthe-folder but: an upwardly and outwardly; flaring por- .tion. This upwardly and outwardly' flaring ,coyer is inade of soft and very flexible ma ter1al. such as leather.

portion is particularly desirable "when the Under these circumstances the outwardly flaringupper portion of-the forming block spreads the upper portion of the margin out somewhat so asto tend to prevent the. formation of puckers inthis portion at the stage illustratedin Fig. 7, the puckersbeing formed in-the locality engaged by: the folder and progressively flattened by the". folder into{ plaits almost: immediately after they are formed. It should also'be V noted that with a forming block having this upwardly and outwardly flaring portion, the margin is .bent into a reverse curve-(see Fig. 7 )-s'o, that-it is gripped more strongly than would otherwise; be thecase between the cam 115 '(see Fig.1).

."zgbl'o'ck from 'chattering in its cam track, the rod-'37 .is urged to the left by coiled spring,

folder and the formingblock and is conse-- tlgwjhich bears at one end against theend of the sleeve ,and at the other end-against a collar-43 which is adjustably fastened; set screw to the rod.

v g ,The forming block 23 is fastened 'to a small rod 45 which is slidably mounted in the stem '38, and said block has aflat under side which rests upon the flatupperface of form ing plate 21. iThe block'QB isadjustably as tened to the rod 45 by a set screw fl. said rodwbeing urged continuallyto. the right by the tension spring 31 which is fastened: at one1endto an eyebolt 51 in the steinj-33 .andattheother end to small bracket 53 -ad-justably held in place on the rod 45 by clamping nuts 55 so that the tension ofthe spring may bev varied. TheeXtent-to which the rod .45-is (permitted to move to the rightis limitedby a stop 57' in the form of a .collarj threadedupon the rod and adapted to contact withthe stem '33. The right-hand end of the rod 45, which is turned down somewhat,isiadapted to contact,- when the folder IQhaslr noVed li'orward'to aboutthe position- Shownjin Figures 6 and 7, withan abutment in' the from of a hardened block 59 fastened by ascrew 61 to the slide member 63 to which the members of the folder 19 are pivoted. The force' withlwhich the margin of the coveris pressed against the block 23 during" 'thedoldmg operation thus depends upon the p'osition occupied by the block 23 on the rod :45, provisionbeing thus made that thicker orthinner materialsmay receive the saineor different pressures as may be desired.

Y Any suitablemeehanisms may be employed for imparting to the corner guides 27, the former 21, the tWO part folder l9and the table 17 the movements which have been de scribed above. The particular mechanisms shown in the illustrative machine are the same as thoseof application Ser. no. 729,930, which has been referredto above," the details of-their constructions forming no part of the 2 TllQSGIIlGCllfiIllSIHS will,

present invention. therefore,"befdescribe'd"very briefly in a general way. f v

The corner guides '27 are normally in their lowered position, as shown in Figure 1, They ni'ust' be raised slightly topermit theniargin at the corner 'of'a cover to be presented ben'eath theiinthen allowed to descend into lowered operative position so as" to engage the edges ofithe backing 100 adyac'ent to the corner thereof so that-the work may be properly positioned, thenraised and held raised during thefolding operation, and finally permitted to descend to the position shown. These corner .guides 27 are carried at the jouterends of arms 65 having a common hub whicli is fast to a rock-shaft 67. The rocksha ft has 'i'astto it two arms'GQ, 71 carrying rollers attheir outer ends. Cooperating with the roller on the arm 69 is tothe frame at T3aiid'having pivoted to its rear theupper end of a link 75,the lower end ofwhich has a pivotal connection with an arm 77," sa d-arm being pivoted to the irame at 7 9 and having pivoted to it near its middle portion-the upper end of a treadle rod 81. The lower end of this treadle rod is attached to the toe end of a heel-and-toe trea'dle, not shown, the heel end of the treadle being attached to'jthe lower end of a treadle rod'83, which, as will presently be expiainec acts to pull the former 21 down uponthe Work. :In the operation of the machine, the

r toelend of the heelrandetoe treadle ispushed part way, down soas to raise the corner guides a lever- 72, pivoted 27 slightly while the operator is placing the corner portionof the'cover upon the table 17, and isthen'rel'ea'sed to permit the corner guides to-fall into operative position. The operatornow locates the work properly with the 'aidof the corner guides. I-Ie-next'depresses the heel end of the treadle where upon, 'as will presently" appear, the former 21 is brought down and lockedintheposition shown in Figure 2. He then pushes the I toe end ,offthe treadle' all the way down and releases, it. Pushing the treadle all the way down throws in a 0ne-revolution clutch, not

shown, which causesthe shaft 85 to make one revolution and come to rest; This one revolution of the shaft through a master camland levers, not shown,causestthe'slide 63 which carries both the cornerlfolder-19andthe straight-edge folder 15 to move forward, to

time.

pause and then to return to the positions shown. As this slide moves forward, a beveled block 89 lifts thearm 71, andfwith it the corner guides, holdsthem raised during'the folding and fold-pressing operations and. finallyperrnits them to fall into the position shown in Figure'l. The tables'17 and 13, like the folders 15, 19, are operated in unison from the master cam on the shaft 85 to press the folds and torelease them at the proper As has been stated, depressionof the heel I end of the treadle to cause a downward pull on the rod 83, pulls down the; former 21 to i press the work against the'table 17. This rod. is pivoted at its upper end to the m ddle portion of an arm 89 which is pivoted to the frame at91, said arm having pivotally connected with its outer end the lower end of a link 93, the upper end ofwhich is pivoted to the outer end of an arm 95 the hubof which is fast to onevof a pair of alined rock-shafts, the v common axis of whiohisindicated at 97. Fast respectively to these alined rock-shafts are hubs 99, 101 at the ends of the arms of a fork which is integral with the sleeve 39 in which, as has been explained, is slidably mounted therod 37 to the outer end of which the stem or carrier 33 of the former 21 is fastened.v A spring-pressed plunger. 103,

mounted in aca'sing 105which is-integral with the arm 95, normally holds the parts in V the positions shown withthe former 2 1 and block 23 raised above the table 17; and a catch, indicated as awhole by the numeral 107, is adapted to hold the sleeve 39 and with p it the former in lowered position during the folding operation, said catch being tripped at the propertime by a roll at the upper end of '3 an arm 109, said arm being actuated by the samevmaster cam on theshaft 85 which operates the folders and the tables.

. The operation of the machine is briefly as follows:-The toe end of the heel-and-toe treadle, which'is attached front and rear respectively to the treadle rods 81 and 83, is depressed enough to raise the corner guides 27;

somewhat above the table 17 but notlenough .to start the one-revolution shaft 85. Ajpiece of work, comprising a backing 100 and a. cover 200 to the projecting marginrof which'a coat of cement has been applied, is presentedbeneath the corner guides and'the toe end of the treadlereleased tofpermit the corner guides to fall; The work is-now manipulated to cause the corner guides to contact withthestraightedges-of'the backingadjac'ent to the corner. The heel end of the treadle is :depressed to pull down'the arm 95 and with it the sleeve I i 39 so as to-cause the forming plate 21 to press the work against the table. The arm 95 "is locked in its lowered position by the catch 107 and the forming plate121 thus held down during the operations illustrated in Figures 7 2 to '11. The toe end of the treadle is then depressed to its'full'extent'and released. This imparts one revolution to the shaft and. causes the following movements. The folder c I slide 63 moves forward,las shownin Figures 1 to 11, and causes the two p'arts of-the folder 19 to move forward andto swing-about their pivots 29 by reason. of the fact thatthe upper ends of pins 111 carried by the tails of the folder parts run 'insuitably vshapedgrooves formed in the under side of a cover plate 113 (Fig. 1). The cam track member 115.;(Fig. 1) in which runs ablock pivoted to therear end o-f'the rod, 37 which carries-the forming plate 21, isthen swung bodily forward to. T move the forming plate 21- outfrom beneath the folded over margin ofthe cover, as shown in-Figure 111 The catch 107 which holds'the forming plate carrier 39fdown is tripped by the'arm 109, and thetable 17 raised to press the fold, as shownin Figure'12, and finally the parts return to their normal positions as shown inFigure 1.

I The four corner portions ofthe work are I,

presented in succession to the corner folding mechanism, which has. beendescribed above, and then the four straight-edge portions of the work are presented to the'straight-edge foldlng mechanism comprising the table 13 and folder 15 (Fig. 1). Although it is stated above that the corners are folded first and then the straight edgesQthis order of procedure may be reversed, if desired, by folding the straight edges first up to points spaced from the corners and then folding the corners.

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

should be understood that the invention is not limited in the scopeof its application to "applications, Serial No. 656,557 filed Aug; 9, 1923, in the nameiof Glass," and Serial .No;

729,930 filed Aug. 4,1924, also in the name of Glass, bothlof these" applications being assigned to the same assignee as isthe present application. a

. 'Havi gthus described my invention, what I-claim as new and desire to. secure by Letters Patent of theUnitedxStates is: V

1. 'A machine of the class described having,

in ."combination, a work support, a folder movable over the work support in a direction substantially parallel-to the plane of said in the'same direction; as the folder, and;

support, a cooperating'forming block, about and against-which the margin of the work is held by the folderfduring the folding operation, said block being mounted for'movement means operating-priofto the movement of the? folderv for holding: theblock stationary V in the path of movement ofthefolder. 2.1:A machine of'thecla'ssdescribed having,

, infcombination, a' .work support; a folder movable overthe work supportin a path substantially. parallel to: the -plane' of said .supc port a i cooperating forming block; mounted tially parallel tothe-plane, of thesurface of the support, a co-operating forming: block located in said path ofmovementand mounted for; movement in a path whichextends in the same direction as that of the folder,-and

means for causing themarginofthe work toybeyieldingly clamped between'the block and the folder during the folding operation.

' l- 4. FA machine of theclass described having,

in'ccombination, a work support, means for bending upwardlythe margin of the work a forming block; a folder andme'ahs for caus ing'the folder, and block to grip the l margin and to move in unison in the same direction ,150

to fold "the margin overthe bodyportion: of

A r ,v Q1 Y 5. A machine of the class described having,

in combination, a support i for the work, means for bending up the margin of'the work :a' folder, means for moving the folder in a' path to fold the upturned 'margindown over. the; body portion of; the work, a forming block mounted for movement in the path of folding movement of the folder and yielding means tending'toresist movement of the block in said path whereby the block and the folderare caused yieldingly to'grip the margin of-the cover between them and to move together inthe same direction over the body portionofithecover. v p I r 6; Amachine of the class described having, a

in combination, a work support, a folder movable: over the support, a forming block, a member by which the forming block is carried said member being mounted for sliding movement toward and from the folder, and an abutment movable with the folder and adapted to contact with said member during the movement of the folder.

7. A lrnachine of the class described having, in combination, a work support, a folder movable over the support, a forming block located in the path of movement of the folder, :1 carrier for the block mounted'for yielding movement, means for causing the folder to press the margin of-the work against the block during the folding operation, an abutment movable with the folder and arranged to contact'with the carrier ofthe'block, and means whereby: the initial distance between the block and the folder may handed to vary the force with which themargin work is pressed" against the block;

8. Apmachine'of theclass described hav ing, in combination, a Work support for the corner portion of a piece, of work, means for bending upwardly the margin of the-work, a forming block having a convexly rounded surface, aifolder havinga concave recess the outline of Which'corresponds approximately to, that of-the'rounded surface of the block, and means for moving the folder'over the support to fold" the "upstanding margin over thebodv portion ofrthexwork, said folder acting to gather the margin abou H round edsurface of the block andto carry the block withit in its movement, the relative positions of theblock and thefolder' remaining unchanged during the time that the folder and the block are both moving. 3 y

9. A machine of the class described/having, in combination, a'support' for'the corner portion of a piece ofwork, meansfor bending upwardly the margin'of the work, aforming block having a convexly rounded surface, said block being-located abovethe support andmounted for vielding movement in a path substantially parallel to i the surface of the support,-a folder mounted for movement in the same path, said folder having in its opera tive edge a'concave recess, and means for causing the block and folder to grip the upstanding margin and lay it'over into a positionparallel to the plane of the work.

10.. A machine of the class described having, in combination, a support for the corner portion of a piece of work, means forbend ing'upwardly the margin of the work, a forming blockhaving a convexly rounded surface, said block being located above the support and mounted for-yielding movementin a path substantially parallel to the surface of the support, a folder mounted for movement in the same path, said folder having invits operative edge a concavelrecess, means for causing of the i the'block and folder to grip thefupstanding margin'and lay it over into a position'parallel to the plane of the work, and means for pressing the: fold between the work support andthe folder. I

:11. A machine of the class described having, in combination a support for apiece of work, aniedge guide, means for bending'upwardly the margin of the work at a corner I thereofagainst the edgeguide, a folder movable overthe edge guide in apath substantiallyv parallel to the plane of the support, a forming block held in the path of folding movement of the folder and mounted for yieldingmovement in the direction of said movement, means for causing the folder to move over the edge gage first to gather the margin about the block and then tocause the block to move in unison with tl'iGfOlClQllQfiIld means for causingrelative movement or ap-' proach between the supportand the folder to press the fold. c

12. A machine of the class described hav ing,in combination, a Work support,,a forming plate adapted to rest upon the worlnafolder, movable ov'er'the forming plate-in a path substantially parallel tothe plane of the forming plate to fold themargin over the plate, and a forming blockadapted to be i moved by the folder in the same direction.

13. A machine'ofthe classdescribed having, in combination, a work support, a forming plate adapted-to rest :upon the work, a

folder movable over the plate in a path substantially parallel to the plane "of the plate to fold the margin overthe plate, aiforming' block adapted to be movedby the folder in the same' direction,means for withdrawing the: forming. plate from the fold, and means i for causing the fold to be pressed between the worlrsupport and the folder. Y

14;. A machine ofthe class described having, in combination; a support for the corner portion ofa piece ofworlrcomprisin'ga bacl ing and a cover the marginof whichprojects beyond the edge of the backing, an edge guide over which the projecting margin extends when the Work is presented to theima'chine, a forming plate havingv .a rounded corner, means forc'ausingrthe'plate to press the work against the support and thereby to bend the margin of the cover upwardly, a forming block located near the roundedcorner of the plate, said block being mounted for yieldingmovement in a path substantially parallel to the plane of the plate, a folder, and means for causing the folder'to press the upstanding margin'of thework against'the forming block and to move the block in a substantially straight path over the plate.

15. A machine of the class described having, in combination, a worksupport, a forming plate,a carrier for the plate movable to- Ward: and from the work support, a folder movableduring the folding operation over the plate, and a forming' block slidablewith respect to the plate and located n 'the path of movement-ofthe folder. c

I 16, A machine of the class described having, incombination, awork support, a form-. ing plate, a member by which the plate s carried,"said memberbeing movable toward during the folding operation over' the plate, and a forming block slidably mounted in the formingplate carrier and located inthepath of movement ofthe folder. 1 i 17. A machine ofthe class described havingfin combination, a workfsupport,-.a form ingvplate, a foldermovab'l'e overthe forming plate in ajpath substantially parallelto said plate,and a forming bloc'klocated in the path 1 r I of mov ement ofthe folder, said" block being slidably' mounted and having a rounded portion facing'the folder and an upwardly and outwardly-flaring portion.

inggin combination, a work support, a folder movable" overthe ':work support in'fa path j substantially 5 parallel t0 -th e'- surface of the support, and a forming block located in the path "of movement of the 'folder andfalso movable pin: path 7 which is I substantially parallel toth'e surface of the work support,

I said'block -having a rounded portionfacmg the folder and an upwardly and outwardly ri r t -fl i I a 1 "195A; machine forfolding the margin at a and from thevvork support,a folder movable It: 18. jAmachineof the class describiedhaw V the corner 'of the'lcove'r of a bookcase 'o ver the round corner of' a board 'the'reof having,

in cqmbinationya work support, a forming plate, a' folder movable over the forming plate dilring the folding operation, and; a i

formingjbloclradapted'to" cooperate with the folder, said block having a flat under surface, adaptedfto rest upon the plate, and means for mounting the block; for sliding move;

ment;

1 o.'A' amnaaaaiding the-marginat 4 p 91-10 the rounded corner of aboard thereof hav the corner of the cover of a book caseovr ing,'incombination, a support forthe work,

a folderl moivablejoverthe support," aform I f. f ving block between which and the folder the tion, a folder movable in a straight path "and having an operative face adapted'to engage the outer face of the'margin, a forming block having an operative face to engage the inner face of the margin at a locality opposite'to that engaged by-'the folder and also movable in a straight path, means for holding; the forming block with a portionof its operative face located in the path of movement of the operative face of'thefolder, and means for causing the folder to be moved until'its operative face is spaced a predetermined distanc e from-the operative vface of the block and for thereafter causing the block to be moved with the folder, the two operative faces being maintained in opposed. relation during the folding operation.

7 In testimony whereof I have signed my name to this specification.

JAMES MQVINTIRE.

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