tlie- ti p eye- a eiease e fla)p i.s adapted to be leati of the f astener or of the on which th ic@t, i@it I)i,efet,abl3, siiiiiiltaiieousl3T ia,itli botli fol(led. siiiiultaiieouslv with the attachment 2il opc-i-.ILtioiis, it is possible to I)osition of tlie'fasteiiini2@ m(@ai;,@ to the envelopc-. the er(,,ise -Niitli such acei.tracy that iviieii the 2. .8- iiietlio(f'ol' the class (.Ieseribed whicli lllap is fol(led oii this creas@ the evelet aiid coiisists of tpl)lyijig closiiit)- liaeaiis 'o one )vill alin-, - i)-s re-istei,. Tfie ol)era- )vall @ixid to ttie flap of III el@illClol)e, 'a'nd iii tion is so depeiidable that i.t is unnecessar-3, foi,min(, a ei,ease oil wbieli tlic, flap is @idapt- 3o to inspect or exaiiiine the product for tlle ed fo be fol(led, 11711ile tlle flilp elll,'elope positioii of the crease lille tis this is a @ged l@)3r rrieaiis )ttssil-lg tl-ii,oii,)-ii the .), s ai-e clig@ 10 aectirateli- positioi)ed uiidei- U@iy itietlio It of tiie eiii,elop(,, ii i s@iid Illip. A vi ll b e, u n d e rs to o d th at ot h e r m e c h, .i ni s m 3. -k in et h o d of - th (, cl a ss d e s ci .i b e cl w lii e h tli ai i th at . d e s c ri b e d li e r ei ]] L m a y b e u s e d in c o n si st s of a p pl .), iii (- r a l @ a st ei ie r to th e - ,v al l of 3 r) -ai,i-yiiig otit the m tliod, the principl of i. U e c n envelope, sliyiult,@iii(@o sly ftpp]37ilIg eyelet w lii e h r e si d e s in th e fo r m ,,t ti o n of th e fl a p ni e a n s to th e fl a p of th e ei ii, el o p e, ai i( I sii n ul - 15 crease silliultincolls][y ii,itli the attaclinient tineousil, til(@l.@eivitli i@ol-li@)iiig a elva,,,e, on of tlle fasteiier or the e-,yelet, or witli both of vliieli tlle flap is t(ltt)ted N to be folded, L-aid these opeiations, or at. least wliile the envecreas4e@, I)ein@,,, disposed iikidway LetNi,eop. the 40 ,tnd eyelet. 11 r lope islield at tne fasteiier ce ter of sild iiieilis ti@ie ceiill,iving described my invention, ivhat I ter of said eyelet iiieanq,. 20 Cl aiM iS Si ed this lotli dtiy of Jtine, 1926 It t-he 911 1. A iiietliod of tlle cliaracter described city, cotinty aiid State'of New York. wliicli consists of appl3riiig f,isteniii(-, ineans to all envelope haviiil, a flap, and in Yoriiiing TAY G. SWAB

Patentecl Feb. 22, 1927. 196189787 UNITED STATES PATENT OFFICE. TO TE-iTS,@- .ON EITVELOPE CO. INC., OF JAY G. SWAB, OF BALDVTIN, L@TEVI YOR-1@, -WEINT YORI-,, N. A CO]@'.PO-R-,,ITTO--L@T OF NE17r@7- YOT-@tK. DIETHOD OF I-Fi.Al@lNrx EITVBLO:?ES. 11-pplication @liled S,,iiie @A,ly i,,iN,-eiitioia i,elateg to ,t iiovel liiethod ofinak,,".Ill' CIP.17elol),,s of 'U-Ype 'In which a apl)lied to tLe body of the envelo])e to -,,)-opei,,,ite A-, ith an @iperture or e,),elet apl,)Iied to the fl--@-,.p of the eTiNelope. I'u is coii,.iiioii practice, to enitelopes act,,ipte'l 1,'o be seat tliroliyh the iiiails unsealed, Ny,'Ith a tastener ittached to the b II, ,oci.)i ol' the ei-ivelope -Lt tl-ie back all Deftr ,e @i i,) end, aiid tliese f,,tsteners h,,t@ e con siste-,l of - .everal t3rpes, one of- -which coiiipi-ises 11).n e37elet portion wliie,i is riveted throi,i!@h the -WIll of tlle enl7elope and on the e.xterior there are oppoSitel3T PI'ojeetillg IU'ys 15 or fin@@ers ivliieli ,ire adal)ted to be beiit u@:)ii,arCII.)T topa-s tl-iroligh the aperture or eye-. let in' the flal) ,tiid afteriyti,ds bent do",ii on the o-titer stirftee of the fl,.ip to se,- ,tire the latter in folcled position aoailist the bacii: 20 Ni,:ill of the eiivelope. As stated tbove v,,trious other t)Tpes o-@. iiietal- fasteners have been 7LIsed, and 'while I pre'@er to illustrate my inveiitiol-i in coiinection -with the partielilar form here desc.-ibed, it -%vill be Linclerstoocl 25 that the method i-tia3, be ,idopted in the malci-ng of eiivelopes h,,Lving other foi-iiis of fas-@: comliion pra , s , teners. It has been etice@ tl o to provide an apei-ture in the flap as ,ibove set forth, to receii,-e the prongs of the f,,is30 teiier, and the fi,,tp is -Lisually reiijforeed by ,,ipl)lyiiig patches or (lises of ptper or c,,irdbo,,trd t@ the flap around the apertiire. The iiiethod eii-ii)16yed for P.-ia-Tiy years in th in,,ik e iiig of sii,-I@ eni,elopes has i-es-Lilted iii35 colisider,,zble -waste due to rejections oil ,tccoi-iiit ol' the fol-cl or cre,,tse of the flap loeing iiiiproperi-v 1)ositioiiecl, so th,,it when the flap iy,a@,, folded Lipon tl-ie re@.-,r A-vall of the eni,elope, the eyelet of tlio -iqa@1) did liot accu40 rately i@egi-ster with the metal fastener. Not only lia-ve there been iiiitcrial losses citised bl@ re,' etionF,,. but in the o" je -f tf@ese e-i-i@,elopes it has I)een iiecessary to ii.-tspe,ct 'theiii in order, ,is 1,@ai, as 1,)ossible, to 45 eliiyi;iiite stich envelopes as ive--,e not ").Cetirately mide. I,,i this foriiier i-iietl-iod o'L iiiaiiiifactiire, the envelope.w,,is first fori--Qecl to coiiiprise tlie, body por'Lliori ,,incl the qap pro@ectiiig froill one (@nd thereof@ tnd at 50 the s@,tii-ie time the crease w,,ts formed on the Iiiie oii i-vhich the flal) Ayf,,s -intended to be folded. All of this ii,,,is 0,.oiie oii the envelope m,,ichine. After the envelope vv,,is th-Lis macle 19PG. P@ei,-,al -No. 119,658. ivitli the crease line foriiied, it Avas applied to the iii,,icliliie @-,-Ii-ich attached the inetal f as- 55 lueller ap-d foriaied the reinforced a])erture lii the flap. If, after these parts -were atta,,,hed 11-o 'U-he elivelope Pnd flap, the crease liiie 1- ia,ppeiiecl to co@-ne exac,tl3r n-lidway betv)7eell -,Llte ceiiter of,the j,,ietal f.,,steiier and 00 ilie eye@,et, the iqal3 could be 'Loided over, aild t'lie eyelet -v,-olild regis@uer properly Avith the i-rietal fastener. In maiiy cases, however, tiiis crea.-e which was previolisly formed iiot accur,,itel3, position6d, i. e., it -was o'l@L'il er noIL- illiclivay @betweeli the center of ',-he fas'ueiier ai-id the e@,elet, or it -,i@-as slightl y dia('onal ii-i relatioii to the flap, and in slich c@"SeE , it. TN-as iiecessai@y to cull otit the@ eni,elore, @@ iiiiccurately iiiade if inspection dis- TO @loseci Pnv error, or else such envelopeswere likely to be rojecte('[ by the customers of the riiaiilifac turer. 'Uii Oer 1,@iv preseiit iiiethod I am able to .,,ti7o;d tl,.e n'e'cessity for inspection a d to en- 75 ti-rely ai,oi-d rejections dlie to the inaccuracies - ,tbove referred to. This is accoinplished bio,,tdl @3T by fol-j-.,-Iino- tlle crease or fold for the flal@ sii-YiL@..ItaiieoLisly 'with the attachment u ner to the e-@ivelope and the @ for- 90 of ttie fas'e iiiat,'@oi i of the eyelet. As the fasteiler and eye@let ai:e @,,ittached simultaneotisly by n-iechar@ic al means, th-, clistLDee between the cer@ter of the fastener ai-id the center of the evelet is alivavs uniforill on .tny gi e .1701ope and iiiider iiiy iiiethod the crease or ven size 85 a , fold is -pitfer blv forme-,l siiiiLiltane6usly illith the tpplication of the fastener and the foriiiatio -.,i of the e3,6!et, so that the creas@e ivi'll alwtvs be fori-necl exactl@ mid-woy@be- 90 taveen the two ceiiters. As a r esult, when 'L,Iie flaID ;.s folded o--q the crease line, the eyeIct aiid 'Llhe f-@isteiier AAill alw,-Lys reo-ister. Tli,"s is trtie even 'ulioug'il the creaqe line is iiot (,xtetly It ri-li !es Niith the side 95 t Pnf)' e(I-c@'s (,,f 'Llie While various iiiech,@inisliis may be used for cari-yino- out iny improved iiiethod. I li,-tve illus',-r,,,ted in the accojiipanying drawi@,igs parlus oT- an ordinal-y Imown machine 100 for al)plying 'Lagteners to envelopes, -whereiii I h,,ti7e api)lied ceptaiii addi@uional rnechanisin for cariyiii, out the present method. In the dra-@N-ing@forming part of this applicatioil, 105 Figiire . I is a fi-ont elevation of portions

@C@,istenci, Ipplyiirl(, in,,tcl@iilie (lie p@ii.@ts i'lecessary to in carry out niy pi,ocess, Fi(rL[i@e 1-@ is ,i plaii view Of tile patts Slio)i@-ii iii Fio,-LL-C' 11 Fi(,Lii-e 3 is a relir elt-,vitioii of an envelope -foi, i@eeeil,7'111 ,C, t"lle fl ncr , ii(I t:@ tstc, eye let iii accoi-d,,tiiee @\Vitti iii)- ini,eiition, 4 is t si.iiiilai- vit-,N@7 of t'lie eiii,elop(, io aftc@r tlic@ h,,is beeii tretitecl accoi,diiig to the 1)1-('Sellt @iii(,l I"ig. 5 is ii detail \,iei), of oiie of tlle (-@tict fi.Iille iil(,Ii-ibers of iiay inacliine. Ill l@i(ytll,e :3 1 shoi),ii a coiiiiiion t3lp(', 15 of eliVe@IOP(2 tO i'@listeiiers ,Ire usu,,tlly apl)lie@l. Iii this the rear ivill 2 of the eiril-elope I is 'L@110)Vll, the edges 3 o@f this wall I)eiii<r ("Illect o togetli(It' e3 zn to exteiicl of ,iil(t l@li(,, 20 lower (,@iid 4 is fol(Ic@d o seeiil,c(l agaiiist the i-e@ ell('[ of the eni7e,lol)e ti@(@ fi.@olit C@ is carric'cl forivlllld to forni i ll@ip ") )i,liieli PL@oj(-Tts I)c@- I . I sufficiel t@]@- yon(.1 the cii(' 7 of the re@,ir Nlalf to perillit tlle flill) t@o 1)(' foltioci ovor in([ to (Vei-l,,Il) Clio ell(I 6f tlic, b,-tek 2. Uiict. i@ tile pi@esoiit I)Uoc(@ss the @,is S110AAn iii reilltiiis uiici@l(Illse@t li@ the bas(-, oi' tl-l(, fil@ip @is it Collies fl,O eiivelope ii-i@i30 chiiie, i@@lierc,@is in prose etice tiici,c@ is s the base of ise forii:iec the ll@@p @iiid ad jtceilt t@ll(' CoilliGrs 8 lvliei,c tl-io tippei- ecl(,e 'i (-f tlig@ L)@,ick will o@f eiiii,elope iiiel-g("s Nvitli tilg@ l@'Ise ol! tlie, flip. 35 lii ri i(,@ire @:t I li lias be eii coiiipleted accoi-diii(y to iii3r itietliocl. Iii this view t'll(@ C711@-C'101)e f.ro,ii th,,it of Fi(yiii,(, @)' iii the fact that the fasteiier 9 whict, ("olisist,@ o-C iiii 1,01@'- 40 tion 10, )i-Iiicll is I'iv(lte(t t,lll'Ollgll t-ll(, i,(,,ar wall 'it t@lic, iiilc ()f of tll(,@ el-Ll,(- ,'101)e i aiid of tli(-, l@it@ei,alt3r o). proii(rs 11 Ni,liieli @il-@ t-.o l@),, @ip a,watiroiii the eni,c@lol.)(@ 45 NN,ardly ag,,iiii, is ,ipl)liecl to til(@ i:n adaition, tile fl,'Il) i@ lieile Slio@@ll 'Its PI'(- vid rttire '1'-) ed witli an ipe t', , let to rc66ive the pi,ongs oi, fiiif-,ei,s 'L@t of fastene.i-, aiid this (,,Yelet is ller(" IS 50 inforce(I iii A@,ell l@11011@TI iiitiiinei- ],)N, ii,ieaiis oi@ patelies l'o' il)plied to tlic, OPI)O"ito @i'@ices of the flap siiri,oiiii(Iiiif, tlio 12. Oil wliieh the (@l)velol)e ft:ii) is The crease 14 adapted to 1) @l'ol(l(,tl ( r- i,,,iiiiist the )11-(" 55 111 (f tlle @is I'V betii,ceii ti@Q c@e@ilei@ o@' let 10 aiid the of tlio that wl)-eil the flap is @l' ) .0(1 iil)O@,l C!1.1@@@ls(, line, the ij,)ei,tul@(@ 12 an@l 17ill ]@@ (@ @ly @l,@ - 60 ter and tlierefoi.e tlic@, ' pi@oR',,S I t I)c upwardly a.nd pissed tll(@" 12 without distortiiig the flill@) I-lie el)-velope. So far ,Is the fiiiislic,@l i@)ro@Iii(,@t -@@i concerned, it lias tlic, saiii(@, @,s en.-elope fi-.nishe(i iiiider the ol(t ii@iet-,Itocl, 1,618,787 vided the lattei- is c,,iri,lecl iccitl.!Iteiv, It will be appii,ent t,liat if the liii(@ i-I. is foriiied pi,eviotis to the ttt,,i(@Iiiiiejit of iii(@ fastener aiid the foriii@ition of t'lie 12, and if thi@3 ci-ease liiig, lial)peit to o be ne@.trer tlic, of tlic,, 4@@isteilel@, 9 tliiii the center of the @ipert i@ 2 b.)@ tli of an inch for tti(@ii iilieii flap )Vllts oil tli(,, aperture 12 @,inct t,!.ie l@)(@ oiit oil i@e(.,@ister 7 iii this liigttliice of,@ aii incli be,- caiise ivli(Iii tlit-@ ft,,tl) i,s )'olcl(,@d. o@,cr the ei.@ror is itiultiplic(i 1).@- t@),(@ i,@,, to siy, if the 'ci,(3@ise I.iiie l@l@ i@@.; iie,,ti.or ttio cejitei, of the I'as9 b.-), oii(,,-sixte(@ntli oT- in ilieli, it is so ,iIS6 ollo'- s . ixt,-Ieiitli o:f iin i@icli f@irthci.- fi,oiyi t@li(, ceiite.L' of! tile 12, 4@o tli@it ttie inof tl@i(@se, 1),irts be(,oiiiqs @;f Iii iiieli. iii ttie p,--esCllt 11,1(,tlic)c . t ttle li@ile i@t is in all (,@tseS 85 ON@'1,) 1'( i t-.Iio eciitei, of the @ 9 ai@(I tli,e (,@ejiter o-'@ the ,ipei@ture li), at tli(,, I)oiiit l@) so that AVII(@ii t,ll(, fl,,tp is fold', @tenc,,r 9 alii,,,iys ccl ilie -12 ziict the i',is -- ,. 'r (,,acli otlio@- inO@ I,t is tliereToi-(, oo L"Illl(,Cess@ll@v to (-Iistort ttio fl,-,,I) 01@ the en1-01(pe ill @rc,e@, to clo@le tlic, L it - is uiiiiecessary to i@6i-iii I lie)v creas(, Iiiie - foi, the pi.ii,pose. Iii l@i(,ui.@es I iiid I-) I Iiitve slioii,n parts of 95 4@oi, itlt@t(,Iiin(r tlae l@astenei,s to the i:llav, be liacl to the to AIT. r@icii@ir(-@@on dated Dec. 8 413. for the illusipati'oii of iiiacliiiie for perioo In the draiviii(rs liereiri I illl 7 ttibe 16 ",hich carextkiidii.ity ,,@s the 17 at i-iglit angles to tli(,@ tiil)e 1(') ,t id it is pi-o),i(led oii its oiiteicild t r@iise(.1 I-,ortioi-i 18 -@vhich fOrD-l@, 10r) tii aiin-il 1) eyelet I )r iiieaiis of @-vliieh the of is i(lii-)t,ed t- riiett] l'o f astenc,,r 0 lie upset or (@(l. 'I'l@lere is I 19 giiided iii a tu1-;itlai., siil)l,)ot@t L)O iiid tli(, .'forw,,ird eiid 6fI)] to co-opei-ate )i,itli iio is I(Ial)tt the aiil7il 18 to iipsc,,t tlle riiet ii-i tl-ie opei-- ti@ioll ol@ '-lie fistener to the ciit tlle ,iiivil ariii 1'7 is sttthe I)IIIIAgel, 19 iiioves iii to i I'Iie 1.0 ivliieli llr) tl)e trli@i ,t . (,tii(le T-or t pliipger )i -v@Iiieli to ',IPI)I.Y on oi is e the, I)i,eces to tile 01 I I,Ilel.e is sttl)t)oi-t 1)2 arri,ii(rect ill 120 ,-.\jai ilio-ii e I)Q sill-)])Ol@t l(i is @i 2@)) iii this SI[I)POI@t, '111(l it s(,,r@es tlo app'ly oiie of the patelies l@) to tl)o, ol,),I@)osil-e of tll(, to the oiie ])IN, t@ie I..)Itinger 21. The pirts jiist 1 des(,ril)e(@, at@(, all co]-,Ilyloll to It lez.,3t olie lzrlolvn 1'(Ii.,m ()f @ittic@Iiing iii,,ichine. @ill @idditioii i-o the pirts dc,,scribed, I liave act(l(@d a st@@itioiiiry li@i:ilo (@i,ezsiiig i-nei.)il)ei.@ 2@l. slio)l,ii iii Fi,ytii,c@s 1 aD(I 2 ,tnd it is of SUffl- 130

e @rie-iit lengti-i to Torin the crea Lcross the fl-,ip " the ividest envelope tl-ie iliftebine is -idapol ted @to liandle. I have shoivn this creasing iiieiiiber slipported ",It top and bottom tipoii bars 25, 26 ivliieli are doiinected by@ the end frames 27 to form a ri id rect,@in(yular 9 Z--, support. This cre@tsi-,ig niember is proi,ided ivitli a slot 2S throtigh ivhich the ,tnvil arm 17 extelids s6 tli,,it the forward edge 29 of 10 tiiis el-e,,tsiii@.@ i-iieiiib(,,r is coiitinuous; ancl iii ti,e prel'(,i,i@(@d coiisti-tiction tl-iis f orwar,d edge is -ma(le @vitli a V sliape ,is shoivn in the dr,i-v@7'n(,s, 'n orde-@ to constitLite the inale I @, I 1 1 meiiib6r of the ei-easin(v (levice. There is aii15 other creising i-iiei-iiber 30 irioi,,ii'Lled parallel ivitli tlle rlember 24 and also slipported on @the iippei@ in(I i.o-%Yer rods '-)5, 26 blit thi@ meriibe,r iq. idapted to slide on ti-iese b,,trs or rods toNv.,,ird )Pd frbii-i the st,,It'onary ineiii20 bei@ -14. In ord-er to provio,,e for moving tl-iis ere,-tsing 'iiiember. I liai,e slio-\vn ,t tog(yle lev-lr irr,,tnaeiiient in Figiire 1. TI-iere are sliort brziel@ets '01 secured iii fixed positions resl)ectively to the tipper and lower bars 25, 25 I)ehiiid the movable creasino_, iue,ber 30. At the ljoliit 32 there is pivoted to this I)racl@et -It lever ariii 33 aid these two lever ai-iiis eciiie too-etlier near the vertical center of the cre,,tsing device .ii-icl are provided at 30 their oi,erlapl)in(y eiids ivit.h 16nLyitudincil slots 34 i-n ivhich eiagages a clrivin@@ pin 35. This pin is giiided in a liorizontal slot 36 In the t-tiblilar support 22 and it is moved similit,@t,,ieoiisly witli aiid by tl-ie plunger 23 35 -wliieli iii,@ty be opei,ated bv the ineelianism shoivn in said patent. A-ttachecl to. each lelter arm 33 blr a pivot,,il connectioii 37 is a connec'uing Iiiik 38 and the opposite ends of these are pivotecl-at 39 to tl-ie rliovable creas40 ing Mei-iiber 30. As @uhe PILin-yer 23 is iiioved to the left in Fi(yures 1 and 2, the pin 35 t, acts Lipoll the overlapping encts of the levers '0'3 and thes6 leiters, piltotiiig at the points 3@) ,.let "-ilrough the Iii'lks 38 to move the 45 creaser b,,ir 30 to the left; and upon a rei,erse movement of tl-ie plun(yer 22 tlie levers '3' ay@ i 0 , reATer,-@ed i.ii iiiovement and the creaser bar, i')O is moited to the right in the dra-wiiig. Usiially the pltinger 23 iiaoves. about one inch 50 Ill exteiit and the movement is red-Liced t-lirougli the levers 33 so that the creaser bar ,)O need oiily iiiove about three-eiglitl-is of an ii-icli. These proportions ,ire iiierely st,@ited to indieate one desirable forlil 6f device ivhicli iiiav be used iii carrying out iiiy iiiet,hod. 'Phe T-orwarcl or active ed(ye of the ei,easer bar 30 is provided ivith a V shape croteli 40 -wbieli co-operates ivith the edge 019 of the other creaser bar, so th,,it these two 60 ed(yes compress the envelope n-iateri,,il ben t-\Veell theiii for the purpose of foriiiing the crease 14. Iii carryiii- out my metl-ic@l, the envelope n is applied to tlae, machine in the maiiner (j5 shown iii Figure 2, by placing the flap 5 e r betiveeii the plriiiu,@ers 21, 23) witli tli po tion 6f the aniil ariii 17 ivhicti protriides tl-irotio, 1 =1 the ef'easiiig b,,tr 24 'nserted ivithiii the, open ei-id of the clivelope utitil tlie coriaers 8 con-le tip agaiiist, the edge 29 of the T-liale creaser tO iii,-iiiber this Leino- the iiietliocl of o-au@,yin(Y I -- L@lie positioi-.L o-P ttie -eiivelope in relatioil. t@ t@-"e dei,ice. 1-n this position, tllo ',Illvll 18 faces'ihe retr ,Tall of fhe eiivelope at the iiiside t-l-iereof, ap-c! tl@e pitinge@r 19 is ii-i li,.ie 7 i-vitli the alivil. The actilte cdges of Llie creasino, bal,s in ricylii-e 1), ,ire ex,,Ictly halfivair betiveeii tl-ie ax;al li-.ies of tl-it- pluno;er 19 "aiid a,.ivil IS ,incl the axial I'Iiie of the p!Liii(,Yers 2,1, 23. Pre-Ller,,iblv the eiivelol)e 80 coitacts with the statioiiary pluiiger 21, -with the ed(Te of the iliale,,i-iieii-ibei, 24 ,ti-id wi'Lh the ai-ivil 18. It will be tinclerstoocl that one of @tli-e n@eta', fasteiiers is tlii!e,,ided onto the projectiiio- end of the pltinger 19 8,') aiid that eacl-i plllii(yer 21 23 is S-Lipplied with a strip of patell iiiiterial slii-'Uably supplied Avith a(@lbes've, ,tll of l@"hich iiiay be -s showi-i i,-i said pat-ent. As tlle machiiie is set ilito operatioii to appl3T the fastener and the 90 patcl-ies, the folloiviiig actioiis take place: TI-ie plunger 19 carr37ina the rriet,-LI fastener approache s the aiavil 18 presentiiig the evIlildrical portioii of the, fasteiier tlir6ugli tfie rear ii,,,tll 2 of the eiii7elope, until the iliner 95 eiid of this cylil'idi,ic,,,,l portioll of the fasteiier strikes the anvil; and a. continuation of the nioveiiieiit causes tl-ie same to be upset or riveted agaiiist the inlier surf,,ice of the back ivall 2 so that wheii tl-ie plililger 19 100 has coliil,)leted its iiioven-ient, the fastener ivill have, beeii attached to t-he cliitelope. While this moveiiient is ta,l@inu plac-e, the pltinger 23 is also moviiag to the-left in Figures 1 aiid 2, so that a patch 13 is appliecl by 105 both pltiiigers 21, 23 to the iii'Llermediate fla p aiid surrouildiiig the openilicr 12. Ill somc@ cases the aperttire 12 may b@'formed by an iiiterior pulich at the 'u-il'Ile the pat6lies are p . ressed against th6 wall of tl-ie flap. When 110 the plungei- 23 moves to the left in the o p eration just clescribed the creaser bar 30 is also iiicved to the left,, so that at the moment the plud-er 19 lltl'ld the pluiiger 23 con-iplete their movemeiits the -,vall of the eiiielope is 115 c6mpresse d betiveeli tl-ie edg-es 29, 40 of the creasing iiiembers, so that the crease 11 is formed WIiile the elivelope is helcl by tl-ie pl-Linger 19 by the aiivil IS and the plu'ngers 21, 23. As -,t result of this the crease@ 14 iS 120 certain to be positioned exactly midivay between tl-ie center of the evelet and the ceiiter of the, inetal fastener, at least at the poiilt 15 iii Figure 4. After the attachijig and creasiiig operations hal,e been complete-cl, the 125 pltiiigers aiid the female creaser are retracted and the envelope withdrawn ready for tl-ie op,eratioli to be repeat-ed with another envelope. By formino, the cr-ease simultftneoUSly Witll 130