9 Having thiis des6ribbd th6 invention, what -i@ 'claimed is: 1. In a bag forming mechanism, in combination, an expansible man&el, container form.ing means comprising means for forming a fla,t bag baving an open mouth portion and pro@ided with an unsealed portion forming a vent in the opposite end of the bag, said container f6rming mean@ being disposed with relation to the mandrel to support the formed bag in substantial alignment with said mandrel, bag opbning means cooperating with said bag forming means and arranged to engage opposed side waus of the flat bag to spread them apart, means for drawing the opened bag onto the mandrel, and means for directing a stream 6f air through said vent and between the side walls of the bag to facilitate separation thereof during the opening operation. 2. Iii a packaging mach'me, in combination, an 'expansibie mandrel, means for supporting, a flat bag in alignment with said mandrel, said bag having an open mouth portion and provided with an unsealed portion forming a vent in the opposite end of the bag, means for opening and transferring the bag onto said mandrel including means arranged to engage opposed side walls of the flat bag to spread them apart, means for directing a stream of air through said vent and between the side walls of the bag to permit separation thereof during the opening operation, and means for moving said bag engaging means to effect opening of the bag and for drawing the bag onto said expansible mandrel. 3. In a packaging machine, in combination, an expansible mandrel, means for supporting a flat bag in alignment with said mandrel, said bag having an open mouth portion and provided with an unsealed portion forming a vent in the opposite end of the bag, means for opening and transferring the bag onto said mandrel including suction means arranged to engage opposed side wails of the flat bag to spread them apart, means for directing a stream of air through said vent and between the side walls of the bag to permit separation thereof during the opening operation, and means for moving said bag engaging means to effect opening of the bag and for drawing the bag onto said expansible mandrel and means for sealing said vent while the bag is disposed on said mandrel. 4. In a bag forming machine, in combination, bag forming means comprising means for folding a web of bag forming material longitudinally to form a U-shaped strip, means for sealing the strip transversely at spaced intervals and along the open marginal edges of said strip to form a series of connected bag sections, said sealing means being constructed and arranged to incompletely seal the striptransversely to provide an unsealed portion forming a vent therein, means for intermittently advancing the strip a distance of one bag length each cycle of operation, a cutter for severirig successive endmost bag sections to form individual flat bags each hal,,ing an open mouth portion and provided ivith an unsealed portion forming a vent opening in the opposite end thereof, bag opening means cooperating with said bag forming means and arranged to engage opposed side walls of the flat bag t-o spread them apart, and.ni@ins comprising an air pipe disposed longitudinb@@of and within the U-shaped strip and ha-@ing- its end term'mating adjacent said cutter for directing a stream of air through said vent 'to fadilitate iepar@tion therebf du@i ng thib og6ning operation, said air i)ipe being of a suticient size to provide a bulge in the @ide walls of the ba'g. 5. In a packaging machine, in combiriation, bag forming means comprising means for folding a web of bag forming material longitudinally to form a U-shaped @ttip, means for sealihg the strip tran@versely at spaced intervals and along the open marginal edges of said strip to form a'serie's 10 of connected bag s6etions each having an unsealed portion forming a vent iii said transv&rgoly sealed portions, means for intermittently@advaneing the strip a distance of one bag length @ Obdh cycle of operation, a cutter for severing succbssive ii endmost bag section@ to form individual flat bags each having an open mouth portion and provided 'with an unsealed pbrtion forming a verit opening in the opposite end thereof, bag opening means @codperating With g@Lid bag forming means Eirid arranged to engage opposed side walls of the flat bag to sliread them ap6,rt, and means including an air pipe passing between the folds of said strip and through said unsbaled portions for directing a stream of air through said ' vent and betiween 26 the side wOIls of the bag; to facilitate sel:)aration thereof during the opening operation. 6. :In a machine of the character described, in combination, ba-g fbrming I means comprising means for folding a Web of bag formin@ m@terial So longitudinally to form a U-shaped strip, an air pipe passing between the folds of said strip, feed rollers for intermittently advancing the strip a distance of one bag length each cycle of opera-. tion and arranged to straddle said air pipe, seal36 ing means comprising a pair of L-shaped cooperating presser members arranged to provide a, transverse seal at spaced intervals and a longitudinal marginal seal, the vertical leg of said L being spaced to straddle said pipe and to provide 40 an unsealed portion in said transverse seal, a cutter for severing successive endmost bag sections to form individual. flat bags each having an open mouth portion and provided with an unsealed portion forming a vent in the opposite end 45 thereof, bag opening means cooperating with said bag forming means and arranged to engage opposed side walls of the flat bag to spread them apart, said air pipe terminating adjacent said cutter and being arranged to direct a stream of 50 air through said vent and between the side walls of the bag to permit separation thereof during the opening operation. 7. In a machine of the character described, in combination, bag forming means comprising 55 means for folding a web of bag forming material longitudinally to form a U-shaped strip, an air Pipe passing between the folds of said strip, feed rollers for intermittently advancing the strip a distance of one bag length each cycle of opera60 tion and arranged to straddle said air pipe, sealing means comprising a pair of Lshaped cooperating presser members arranged to provide a transverse seal at spaced iritervals and a @longitudinal marginal seal, the vertical leg of said L 65 being spaced to straddle said pipe and to provide an unsealed portion in said transverse seal, a cutter for severing successive endmost bag sections to form individual flat bags each having an open mouth portion and provided with an un70 sealed portion forming a vent in the opposite end thereof, bag opening means cooperating with said bag forming means including suction members engageable with opposed side walls of the :ffat bag at points above and below the line of comand between the side walls of the endmost bag 75 munication between said vent and the mouth of

12 ,the-,bag @prior to,-the,-,severing--operation--,@meang for -,walls@ of the7 flat,- ba @ t o r . . , @ s r e a d @ t h e m . a p a T - t , , @ , , a n d g - - - P .Mov.ing:said@ suction members to@@.effect:qpening of means including a longitudinally extended -eler .the-. bag, sa-id;--air pipe@beinglarxanged@@to direct- a ment:.of. less width than- a-,flat bag. disposed in a -Btream: of air@- throug-h:said;vent-, and- between the position,@to..extend,-between the %ide walls of the,side,wa-Ilsofthe@bag,- prior,,@.to-a-ndd-ur.ing,theopen- 5 @flat bag during the,forming, operation and, means ,ing.operation; holding@ said. 7walls together, on- opposite 7 sides of 8.. In,- a- machine., of t-he- ch'aracter.- described i in sa elementforshapi ngportions@of:t hesidew - Combination, - means for :supporting @ a @ flat bag of the,bag to provide a relatively narrow distended ..having, an open, mouth.lportion,-:at one end @of the passageway betwelen the@mouth. portion@of the.bag .bag and provided@with: anlinterrupted @'transverse @10 @and@said@ @unsealed,portion.whereb y-,.to7@admit air seal:to@providefan-unsealed-Por.tion forming a-vent : .in the-,opposite, end:6fthe.bag, b4-g,@opening means @arr-.anged@ to engage: opposed,side walls of the flat - bag-- to - spread, them@ apart, means @ for directing @@a strea-m@ of @a-ir. - through@@said vent@.@and@:betweenthe 15 -side,.-W-a lls@of-.the@bag-ta,facilitate separation-thereof, d-uring the opening pperat-ion,@:an@ expansible mandrel; uponwhich the@opened-,bag:is-drawn:and means. for @subsequently, sealing said- vent@ o pening while -the, ba @ is disposed 6n the mandrel ,9 @9. 1-n abag forming@@machine;@ in combination, ,container@@ forming means;:comprising -means, for forming.a flat-bag sn d@mean&for-effecting;-an incomplete transverse-, -seal at one @ end. thereof to _-provide; a@ flat; bag,:having @ an gpen mguth, @POrtiOn .25 at one end of the;fbag@.an d@,-an,-,,unsealed portion formin - a vent -in- the -opposite: @end of @ e bag, th bag @opening :means, cooperating - with.'said bag ifor-ming means arranged@to engage,o _pposed-@side between. the, side ,walls to. I facilitate separation -thereof, during the ba,g ppening operation.. J.OHN -G. -VERGOBBI. ..REFER-ENCES- CITED -The. @followlng. r-.ef erences:are @of -record-, @in @the fUe of this:-pateri-t: UJNITED'-STATES -PATENTS Number Name Date 1,780,142 Becker et.,al. Oct.,:2.8,-1930 -1,7&@,,281 -Beeker@et al - ------- Jan.. 13i 1931 Maxfield ------------- Feb. .7,-:1939 @2,177,919 V@ogt ------- --------- Oct.-,31,@193.9 2,2,45,675 June 17,.194@.1 2,272,530 Patterson.,.--------- Feb. 10,:1942 2 321,393 Hohl , ---- ---------- ..July, 13,.,191.3 I - 2,32619@31 Dalton.et al., ------- Aug... 17, 19,43 2,446-,7.98 Vergobbi ------ ----.Aug- 10,..1948

Patented Dec. 4, 1951 2 1 5 7 ' 7 9 3 8 6 UNITED STATES PATENT OFFICE 2,577,386 BAG FORXMG MACHINE John G. Vergobbi, Quincy, Mass., assignor to Pneumatic Scale Corporation, Limited, Quincy, Mass., a corporation of Massachusetts Application August 14,1946, Serial No. 690,368 9 Claims. (Cl. 93@-18) 'Ibis invention relates to a packaging machine and more particularly to a container forming machine. In general the invention has for an object to provide a novel and efflcient container forming 5 machine which among other uses may be embodied with advantage in a packaging machine for producing the inner liners for lined containers. , Another object of the invention is to provide 10 a novel and improved container forming machine of the type provided with a mandrel or forming block and in which provision is made for opening a flat bag and transferring the same onto the forming block in a novel and efficient 15 manner whereby to overcome difficulties formerly encount ered during such operation. . With these objects in view and such others as may hereinafter appear the invention consists in the packaging machine and in the various 20 structur es, arrangements and combinations of partshereinafter described and particularly deflned in the claims at the end of this specification. In the drawings illustrating the preferred form 25 of the apparatus, Fig. 1 is a plan view of a packaging machine embodying the present inven-I tion; Fig@ 2 is a side elevation of the malchine shown in Fig. 1; Figs. 3 and 4 are end views in cross section taken on the lines 3-3 and 4-41 30 respecti vely of Fig. 2; and Flg. 5 is a perspective view of apparatus for opening and transferring a flat bag onto a collapsed mandrel. , In general, the present invention contemplates the provision of apparatus for the production of 35 inner bags or liners adapted to be sealed for use in a container suitable for the packaging o f dehydrated foods. In the preferred embodiment of the invention individual flat bags may be produced from a web of bag forming material com- 40 prismg a heat sealable material such as the product commercially obtainable in sheet form under the trade name "Plyofllrn.1' Provision is made for forming the bag forniing material into a strip having, @a closed top and open bottom and for 45 sealing the strip transversely and along the longitudinal bottom edge to form a series of connected bag sections. The strip may and preferably will be intermittently moved into position for effecting, the transverse and longitudinal seal- 50 ing operations. Iil the illustrated emb6diment of the invention, provision is made for severing successive bag @ect@9 i@s@,adJ@cent one side of each,transverse 2 on one side by the folded edge and heat sealed along two edges. Provision is also made for opening the flat bags thus formed by bag opening and transferring means arranged to engage opposed walls of the bag, and to ceparate the walls at the mouth of the bag sufficiently to enable the beig to be drawn over the forward end of a collapsed mandrel or forming bloci and then bodily tra;nsferring the bag onto the mandrel, the latter preferably forming part of a package making machine, for wrapping a container about the bag thus disposed upon the mandrel. In the subsequent filling of the package the extended mouth p6rtions of the rectangularly formed lining bag may be brought together face to face and sealed to provide a hermetically sealed container forming an efficient package suitable for use in the packaging of dehydrated foods or the like. . In the preferred embodiment of the invention the bag opening and trancferring mechanism for tran@ferring a flat bag,onto a mandrel may comprise movable suction mehibers engageable with opp6sed side wails of the flat bag, and said suction members are arranged to be spread apart to effect separation 6f the side walls and opening of the bag to permit the same to be transferred over the mandrel. Prior to the present invention difficulty has been encountered in opening a flat bag in this manner because of the lack of an air vent leading into the interior of the bag between the contiguous side walas of the bag, the displacement of the air from the interior of th6 bag during its manufacture tendirig to h6ld the side waus together. In accordahee with one feature of the present invention provision is made for forming a flat - bag open at bne end and provided with an unsealed portion forming a vent at the other end of the bag, said,vent being subsequently sealed at a succeeding station of iooeration. Provision is further made @for directing a stream of air through said vent into the bag. and between the side walls thereof ptior t6 and during the bag opening operatioii whereby to permit the bag to be successfully opened preparatory to transferring the same onto the mandrel. Referring now to the drawings, 10 represents a web of bag forming material such as "Plyof,lim." ; As herein shown, the web may be withdrawn from a roll 12 thereof -by suitable unN@inding mechanism indicated generally at 14, and, iii thd forniation of the bag the web being withdia-wn is arranged to pass through shaping iiie hanism, compr' ally V-shaped I p ..@q@ng a gener peal @o, @orm individual open mouth, b@gs closed 65 fla@i6d.forming niemb@r 16 and between idle,

2,577,386 folding rollers 18, 20 arranged to fold the 'web longitudinally to present opposed upper and lower portions of the walls of. the web in contiguous engagement. Thereafter the folded strip is arranged to pass between sealing elements 22, 24, 5 the latter of which may be heated by any suitable heating. means such as the electrical heating element indicated-- at@ 26. @As hereiii shown, in order to provide a vent opening in th6 bag' and to project a stream of air through said. 10 opening and into the foremost bag section which is about to be transferred onto a irfarldr-el-,, an air pipe 19 is arranged to extend,vertic,ally,. as illustrated, between the side wallg-of, the strilj, at a point adjacent the forming meftiber. 16-iintil it reaches a medial point between the upper And' lower edges of the strip and thereafter tlie: @ilie is extended in a horizontal plane longitudinally of the strip between the @side walls thereof.' The air. pipe 19 may, and pref6rably will, be flattened 20 out as illustrated iii-order,to occupy a minimum space be@ween the@ walls bf the strip--And. the,-pip6 terminates at a poiiit ad j cent the endraost bag section, as will be hereinafter more -fully described. In order-.to accommodate.the airpipe 25 19 @ between the strip Ouring the forming and sealing, operations, each. roller 19, 20 is fornied in two@sections spaced apart vertically to straddle@ the pipo 19, and, the transverse - sealing,liortions 22, 24 are likewi@e spaced apart to. leave an un- 30 sealed portion at the@ poii-it where the@ pipe @paqses between the walls of the strip. The cooperatin@ sealing meriibers-,, 22, 24 are preferably of an L-shape arranged to formsuccessive transverse and Ibngitudinal seals where-- 35 by to f6rm a series, of equally spaced bagsections, and as herein shown, the strip of bag forming material is, intermitti,-ntly &awri past the shapingl,and sealing mechanisms by a pair of &iven rolls 30- 32- which are lik 1, " ewise formed 40 in tw6. sections sgaced-apgrt Vertically to straddle the pipe, 19 and' tcf continue@ the - vent opening -iti the transverse portion of the strip., The roll@rs 30, 32 are arrangpd.to advance the strip one bag to. a, cutter indicated at 34- arranged to. seve@r the endmost, bag ge@ction from- the strip- along - a iine, disposed,@ immi5diately, t6 the r , ear of'each tran.c.verse segl whereb-y , the- latter forms the,- end 50 or- bbttom closure fdr' th@, endmost l@a;g @sect I iori and- the, severed portion a;dja@e-ent, thereto forms the opening for the rnouth of -the@,succeeding-bag section, thus forming iiidividualbags, op@en at the fbrward end to form the xiiotith of the bag 55 and.having an unsealed medial pbrtion fbrining a vent opening at.the trailin end or bottom of 9 the bag. Therea;ft6r, @ ihe mouth. portions of suc@cessive individual. bags are opened by, bag. open@. 4 being suitably journaled in bearing members 50 attached to the machine frame. - Provision is made for continuously unwinding the web IO of bag forming material from the roll 12 thereof at a rate sufficient to permit the strip to be intermittently advanced by the feed rollers 30, 32, and as herein shown, the web 10 is contiiiuously withdrawn by co(ilierating@ iollers 52, 5t -arranged to Ve driven thr'oilgh coiinections @rom the shaft 48 including a sprocket 56, chain 58, sprocket 60 and cooperating gears 62 and 64, an,: idlet, sprocket 65 being provided to permit tightening of the chain 58 ' The cooperating rolle-r gi.is,arran.ge@d@,to be rotated through frictibi--ial engELgenient:@with the roller 54, and as herein ill'ustrateid, the roller 52 is carried by beari-ng- meinbersi 09 @w@hich are mounted for vertical adjustment in a bracket 70, the proper adjustmeht Veing effected by hand screws 72. In order to take up the slack in the web effected by the contiliuous f6edffig of th6 hiat@@ria-1 whil-e:-, fiie st@ip ig at- rest' the web I 6 is a@ranged- td@- paslgla @ under a weighted roller 74 which latter ig7,6%@ 11Y irio.vabl6, iii vettica@Ey sl6tted' braek6ts@ 76'. in order to peiiiiit@ a qliiek release 6f tll& uvpet f;@od,roll6r 52 the:latter@may be rotAtabl3@ m6untiBd@ti]@bii@ @n eceentri6 shaft 53'provid@id O@ith a@ hbndlo 55i fast ori- on@ th6reof W' fi6reby- @ upon iifant(dl- fbck-,ing of the eccentric shaft the roller is raised uA@.@ wardly away- f@oiii th6jrdll6r 541:t6 i@@cilitE@,t6 the in@erti6n of" a i@@eNAr w@,-b@ of'iiiAt6riii b6tWe6fi th6, r6lis-. rii@:the 6peration of@ ilio rii@6bifie@@@he: web thent pas@e!@- ovbt, thi2@ fl'ar-@,d V,--shdljed-I forih6t 1'6- ajid@@ between the@ verti6al@ r6ll6r@@ 18-1@ 20 @6rrg@nged,.@td 0 s-hape a@rid i'ld' tfie Web@ - as a@bbV6 d@8etib6d", tb' form a strip hav-ing @a cldsed tdi3'-dnd, blibn bbt@ ton!. The strio advbricing'-rol-16r8 301-'39" :is best shown in Fig. 4@,; are, - arrah'gi@d :tb be @ iiitOritit-.@ tently-rotated to advaiice':the strip@oii6@bbg l@ingtheach 6ycle ot op'erqtio-n@ thr-6i! -gh@ bdiinectidn@- iii,crti , ding a ca @m 78, f ost- on tli6 @ shaft@'49@ E@r-iran'ge'ii t6 r6ciprocate a rack @gD@ conn@-6eti@d to: d@ (@@3ii-. lever 82 which carries a roller 84 cooperating wit'h-i -6,ti,arigiBdzto cobpei;ate ing and- tronsfierrlrig- mee@ns. indicqted generally. 60 'ri,i--tli6-cip.eiat'ioirofthostrip@E@dva@ncingrA6th@ at 36 arranged to draw. the bag over ati, exbrii@m whetr the fa@ck ' 91D-'- i@ rodk6d , ut@wa I rdly Aiid has,-- fdrrhed; iiit6gr-'all'y th6reik-itli' a pb@@ cat:tier disk- 9 6--l prciv-ided@ i,@'ith @ pa@wl8 02 Ei@rafigi@& to 6figage- aL rdtchi@tr 94 ia6t on on@@ @ end", dfl th6 shaft 88.' As l@6'r'e'm@ sliown; thcl rack 80 rha3@ giid pt-eferably' wilr be; lie'ld in -- nieshihg rele@tidii with it@ pinio-n- guide. bta@cket 96@ rock' 9-@k m mounted on the shafv,:.9t. @me other end!' 6f the"@ siiaf-t, Og@ is p r o , v f d @ e d @ ; w i t h z a @ b e @ e l e a t ! @ g @ w h i c h 9 iiiesties @Wlifi- a bovbf gear @ l'Ot f6,st'@ on@ the' end"df-' the vartical- sh-c@ft 1-0'2- c-arrying tfie4 @;d@ancirigroller 32.- r o l l b r 3 - 0 , ' . - 3 2 : i s : o @ p y - Vi&& a:xi li,-it'e7riteshirig, geolt l@04, 100,@ 69 show n,-t6,d-riv6-tlie@rol16is@i'n'%uiiison;- section each cy@@,le 6f operation@ and to@.present 4,-, tlio @cahl 791. The-racii-offis. ihe endmost bag, s6etion into opprative rel@ation with a pinioiv- 3 6' r6t.- @tdbl@ @ inourited. dti- a sfiblft pansibl6 maridrel 38,',the latter preferably. forming@ one of, a:@plurality thereof 6arriedby an', '-nt6rmittbntly rotatable spid6r 40' of the cartdn f6rnu'ng maching 41'. As@ illustfated in Figs. 1 65 and 5 the pipe 19 terminates immediately -in@ front of,the cutter 34. Referring i@ow to Ft g. , the present'bag-making and transfeiri-ng sectiori of the pael,.aging mathrough@ the', cbrmectioiis; above, desetibed@ the@ pinion -8 6-and ga*l carri er 90, rotttte ' idly ori tlid sho@it, GU; sli@@ing ovet-tii6--teetli of the . rati3he@ 94:, diariiig - this stjoke - whl:ch' c-on@r'.; prises-,he idle--period@ih tl@e intettAittent-dd,.6@ vance@neiit- 6f fhe - 8ttip.- Coiivei@61y,, v@]@en, thei rack 80 igrdck bd- do@vnw ardl@,, fh6-te-eth of th6 rati3he6: aT@,-- engagc-d b@; ihe paw s@ 92' td rotAt.6 chine may be 'd@iven in.any convenientmanner, lo th, e-shAft@6@8'a:nd'-effectrotati ' of-th6- 9,d;@ ihg ori anc ahd as -herein shown.through, - connettion@- .fiom rollers 30, 32, as above described. a shaft 42 fbirnirig a part 6f the carton formirig l@tovigion-ismad'e-f'o@r'- s&pArail@iiig@tlit-,id!6rro'ii ectibri of7- the- ma;dhirie. As - herein shown,@ a ert' I O, 90- and, the, -sttl@7y@ -adtrancing- r6i ler8 - 370'-, @St bbvel'g6p6T.44'fasi on,iiie@sjiAft4i'meshes",Witha to- -strip-o-f VEL,- f,('' :,Ilia iiii't' -Iiei tyeiiiiit@ w g ormitiii t6r @ 6 on a curn-shaf iitt6r '@5 its&t 6--iliertbtt*ee -@ 6ii@w@ ew@r6il@@the;redf':Ji b'evel':gear 46 tast t-4t,@ the e n,wh n

started through the machine. and,- as herein shown, one of each pair of rollers 18 and 30 is rotatably mounted upon an eccentric sbaft The upper end of each shaft 108 is provided with a handle I I 0 fast thereon and the handles are preferably connected as by a link .1 12 to permit simultaneous release of each roller from its cooperating roller. In operation, when a handle.lis rocked clockwise, viewing Fig. 11 the eccentric shafts are rocked in their bearings to effect rocking of the rollers 18, 30 away from their cooperating rollers. From the description thus far it will be 6b,served that the web of heat sealable bag forming material is fold0d longitudinally, and intermittently advanced through the machine, the advancing rollers 30, 32 being driven at a rate such as to effect advancement of the strip a distance of one bag length each cycle of operation. Referring now to Figs. 2 and 3, provision is made for heat sealing the bag forming material along predetermined zones during each rest period of the strip comprising a transverse zone 114 and a marginal longitudinal zone 116, the transverse section having a vent opening therein as described. Thus a complete bag section is formed during each cycle of operation to provide a series of connected bag sections. As best shown in Fig. 3 one of the L-shaped sealing members comprising the heated member 24 is stationary, being mounted upon and insulated from a bracket If 8 attached to the machine frame, the vertical leg of the L being open at its medial portion, as shown, to provide clearance for the pipe 19 and to form a vent between the s,ealed portions'above and @elow the pipe. The cooperating sealing member 22, as herein shown, is formed in upper and lower sections corresponding to the spaced portions of the stationary sealing member 24 and is attached to a supporting bracket 120 forw-ed integrally with an arm 122 pivotally mounted at 124 and which is arranged to be rocked to move the member 22 into and out of engagement with the heated member 24. Rocking movement of the arm 122 is effected through connections from a barrel cam 126 fast on the cam shaft 48 and include a @cam lever 128 fast on a rocker shaft 130 and carrying a cooperating roller 13 2. The rocker shaft I 30 which is journaled in brackets 134 attacheld to the machine frame is provided w'2th toggle linkage including an arm 136 fast on the shaft 130 and a connecting arm 138 pivotally connected to the arm 122. A spring i4D attached to the toggle ,Arm 136 holds the roller 132 against its cam to effect breaking of the toggle linkage to the left, viewing Fig. 3 when permitted by the cam 126 and thus rocking the rnem6er 22 away from the member 24 to permit the strip to be advanced during the strip advancing cycle of operation. Vv'hen the strip comes to rest the cam 12 6; eff ects extension of the toggle linkage wher,eby.to provide substantial pressure of the member 22 against its cooperating heat sealing member 24 to seal the strip as above describi-,d. The.-sealing member 22 may be adjustably mounted upon its supporting bracket 120 by screws 142 and nuts 144. Bent rods 146, 148 carried by the movable supporting bracket, 120, and which extend under and upwardly in front of th6 strip, are provided for engaging and pwling away the sealed strip from the heated sealing7 member 24 when the member 22 is rocked whereby tp pre'@ vent adherencq of the strip- to th& heated SbAl149 inerhber 24. In the preferred embodiment of the Invention provision is made for assuring that the sealing members 22, 24 are in their open or separated position when the machine is stopped and for this purpose, as herein shown, a solenoid operated hook 150 is arranged to engage a pin 152 carried by an arm 154 fast on the rocker shaft 130 to rock the latter in a clockwise direction, viewing Fig. 3, when the clutch isdisengaged to 10 stop the machine. As herein illustrated, the hook 150 is @pivotally carried by a rockingly mourited arm 156, depending from the underside of the machine frame, and which is connected by a link 158 to the armature 160 of a solenoid 162. As 15 shown in Fig. 3, the solenoid 162 is arranged to be energized upon closing of a switch 164 in a circuit 166 when a clutch handle 168 is moved to disengage the clutch 170 provided on the drive shaft 42. In operation, when the switch is closed 20 to energize the solenoid 162, the hook 150 is moved to the left viewing Fig. 3 to rock the shaft 130 thus breaking the toggle linkage to the right to cause the presser member 22 to be moved away from its cooderating meluber 24 during the time 25 the machine is at rest. . Referring now to Figs. 4 and 5, the cutting mechanism 34 for severing the endmost bag section from the strip at each cycle of operation comprises a pair of shear blades 172, 174 carried 30 by a horizon@tal rod 176 extending longitudinally beneath the end of the strip and the collapsible mandrel 38, the rod 176 comprising a guide forming a part of the transferring mechanism to be hereinafter described. One of the shear 35 blades 172 is stationary, being provided with a depending extension i 7 8 a;ttached to a rectangular guide bar 180 extending from the transferring mechanism. The movable blade 174 @is arranged to be rocked through connections from 40 a cam 182 fast on the cam shaft 48 and, as herein shown, the connections include a cooperating roller 184 carried by a lever 186 fast on a rocker shaft 188, a lever 190 also fast on the shaft 188, and a link 192 connecting the lever 190 to an 45 arm 194 to which the shear ble@de 174 is attached. In the operation of the device -the cutter is arranged to sever the endmost bag section at a point immediately to the rear of a transverse seal while the strip is at rest to form an open @,5 0 mouth bag section having a vent opening at the opposite end as described. A coil spring 196 , on the shaft i 7 6, held under compression by a collar 198, is provided to press the blades together in operative engagement. Simultaneously with the severing operation or preferably immediately prior thereto the m ut:@ 0 portion of the endmost bag sectian is engaged by the bag opening 9,nd transferring mechanism 36 whi-ch is arranged to support the bag during and 60 after severance thereof. Thereupon, the bag is carried forward and, as the bag is advanced, t-li-e mouth portion is opened up and the opened bag is drawn over the expansible mandrel 38 to be shaped into rectangular form in the subsequent 65 operation of the packaging machine. The bag opening and supporting means is then returned to its initial position to grasp the mouth portion of the next succeeding bag section which has been advanced during the transferring operation. 79 As above described, the air pipe 19 terminates just before it reaches the cutting mechanism 34, and in operation is arranged to blow a continuous stream of air through the vent Gpenin and into 9 -the endmost bag section to s , eparate the walls @.,7p @4ereof Prepar,%to.ry@ to tr ansferring the bag o@@

@thb Thb@ bl'o'wer -,]@iPLI @l@9 -ln-gY-@be 6onii'@@tiad to:any tisual@-or prefer-red:-s6urbo@@"Of --'air sudh @as:An@air@ump,'riot shotvn, and -may- be,66!itr6lled-by:a vialve 24. As best @shown ih :F-ig. 5, -the - bag si@pporting 6 b@i@id.'I;r-ansf6r-@-ing - mechiiiiism -preferably 66niprises suction means @including a -pluralitsr@ of paiks of opp6sed noz'zles -ZOO extending from pip6s @2 02 *hich are sutiported in @arms 204 fast iip6n -@tud8 206 rockingly, mounted iii a slide 16- -meiiibeir "8. The lower ends of pipes@j2O2 @bre 'donnected:-by- a ilexible @ doiidiiit 2 1 0 aiid vacutm ie,d, @@b 'the no@zles through a flexible i3bn uP @ddi@iiiedted to a valve 214, attached to s @dtisit 2@l@2 'ihe@iTia6hixie frnlme; A cldnd@,iit 2@16 leblding ftom @15 -tlie:undei@ idi3 df 'the valve'214 @mely be cbnn(@cted to a@ny usual br preferred:s(jur6e (if -VaeLiu-i@8iieh as a Vabuum ptimp, not shovin@ The Valv@, 2 4 i@ artanged to be operaled by a. 6air- 2;18 co,bperating Vith a roller 2'9-10 carried by bne arm -20 212 of a bell crank pivotally mounted at 224. 'the other arm 2q.5 of the' bell crank is connected py @ a -link '& 2 6 to the valve operati,@ig arm 2 2 8. As -herein shown, 'Oil e slide riember -2 0 a @ is slidingly r@iountpd for recipror-,ation upon the guide 2r) rod i76 and is inaintained in a vertical positioft @y. the provision of a grbcived portion 209 on the underside thereof a;rranged to embrace the reG-tangular-bar 180@ as clearly shown in Fig@ 5@ The 16ti@r@'Ond-'of each rocker stud -206 is provided @30 *iih an -arm- 2 3 0 - cai@rying roliers @ 2@3 2 arranged tb ooo@erate with a statibiiary cam pioce 234. The @6iids of the arryis@ 230 are connected by a 'i3pring 236 to hbld the @rollers -against @the carq. With this 'cbiistruction it %vill:be:seen't-hat -Nvhen the slide is advanced the rollers 232 following the'stationary eam piece 234 cause the opposed sijction n6zzles '200 to be: :se-oatated to 6ffect 'opeining @of @:the mouth porti.bn As described. egusec)f@thi6leniagei@n,6nt-6f:-th6 verticdl-ly spated @ portions of tlie rollers @ @:31- 32 -with @j tho and '-lower @ portions- of 'the @stkip @i-nd-the@ gtream (if 4ir being blown through the endniost @bag, settio'n @'through the pipe 1:9. Thits, when --the -ba:gis.@-grasped by the @stidtion'nozzles -ab 2100 1 6ve - @?and @ -below 'the @- longitudinal medial por@ion -the -bulged Gut relationship -is@ maintaintd to-,@@continiie,-the -vent'opening; Thereafter the @cutting@,mi3choni,@m -34"is operiited to ;s I ever 'thb 'eiidirioa btig, Isec'-tiGn, @-and @@pon rocl,,ing of @ the blade'l 74 out of cutting position''the blower lpipe @19; iii@y @colitinue to direct air into the -,vent opEiiling '2.3 dii:tiiig. the -tran8ft-r of: -the.'bag - onto the ' 'Coll'al)sed I --mahdreli as - Eibove descrilied. @lt 'will be understobd@th'at;z@ftor the severing bpera',tio-l'i the 7veht%' opeiiing -23 may remain ])aktiaily bpen-due-.',to 'the r@latively -set -position of the side 'waUs-@-after pasging over: the pipe 1'9@ aiid Whi-ch is, m@@iiltained in such I)o@ition@ by @the suctionmerribers '2'09. Thus@ in I one aspect of the inverition, the@.vent opening alone iii communication- with- the atraoslihere -inay be sufficient to permit -separation. of the @ide wdlls by the suctionlriierribers dufing the@transferring operation. H6wever, in,pradtice:@it@is preferred Lto continue ;the@ st'ream bf @,ir:'.in@ @the 'dire(ition bf the verit opening@after severarice of-@the-endmost@bag section from @@the @ ttip @ to assure separation of the -side wblls' While it is@ preferred to provide-@a coritinuous gtreqm of -air, in:pra;ctice, @the valve -21 niay"6e controlli@d:,by@a @cam if desired to @dis:cohtinue@'the: 8tream of @'air during the @se-@ering operation. Upon trarisfereiice df the bag oqto the cdllapsed 'mandrel 18 Ithe@lo@tter @is ex@anded during subsequent movemerit of the intern-tittently op;erated @'spider 40 'df ' the carton f brining machine to the next sta@tion of operation to square lAp the As illustrated h6rein, the slidb mer@iber@108 is @40 @fIM -lbag@ @into,'rectangular 'form, and, when the reciprocated through connections from a tetm maiidrel -comes to rest at this sta'Lion provision '240 ineltiding a coopere@ting cam roller 1242 @car4ried by a lever @244 fast o,-l a tocker shaft 246, leiver 248 also fast on the shgft 24'6i and -,%rhich is @ connected by a link2' ; 0 @ to A lever 2 5 2 pivoted -4@5 d a link @25& cozinecting tho lever 252 to the -slide riiember. In the ' o,oerotibn @of 'the device when the slide -raem-ber @208'is in i-ts fulisr 'retracted position the sL,,ct@ion n6zzl'es 200 engage sides of @the eiidmost bag section and --60 the vacu!Am'val-,Ve 214@lis then opened @tO @effect adherence of:the ba;,a to @t@he@ nozzles. Up6n severance of. the bag secti-o--q the bag i8'trans-ferred to the mandrel as above described and'when@the slide member is ii its fully i@@,@tendi@d@ position @-55 @'th'e7-',VactiWn! valve.@ 2 i P, - is closed to @ release thebag from the nozzles whereupon the slide merhbor: is returned to its retrac@@,ed position@ In the opdration bf the:machine;prior to;and during thetransferring @bperation a 'cdntinubus '60 @stream of air may be directed @tilrou@h@@the Vent opet-ling and into t'fie e,,idirost bag Pection to permit separation thereo@ by@the suctibn niem@ber's'200 '@i-ti @engageri'lent with -the @oliter- surfaces of the side walls in practice, 'the @longitudirieil @medial portions of t'@lie@ side walls of the@@bag@ are bulged out s'@'ghtly in p@assing:over the @pipe It @ to 'I provide I a continuous vent in 'alignment @with the unsealed portion of the transverse seal @and com- - may @be -@itade I for seeiling the vent opening -2 3 @in @the end, df the bag. As herein I-iown, this may be accom]@lished by a pair of' presser members '300, 302,-lone@ of which may be heated@ The -liresser- irf0mbers 300 3'02@ are carried by arms 304, 73D6'j7espectiVely mounted@on vertical shafts 308, 3'11- corir@octed to be rockod !@imultar-eously in 'oppos6d @ diredtions by cooperating gears @3 i 21 -34 4. The arms' 304,@ 1061-are atranged to be -rocked into and out @of: pressing engagement with t]7,e extended@ iingedled portion of the bottom seam by @a @cam: 13@IS @'felst on @'an; extended portion of the 'ealli @sheift 48 and throu@h@ connections including a b6ll crank, one @ arm, 316@ Of which carries a cam r6lier -31,'8 -cooperating -with the cam, and the other @-arm: 32 0 of which is connected by a link @322 to an@arm 924-fas;t on the vertical shaft 308. From'the'description above it will be seen that the pregent bagforming apparatus @is adapted;t6 a flat Vag of ':heat@@sealable material such@is"'@ply6piltrill 6rovidediwith@face to face marginal seamg 7-thereby- @to produce a bag which maybe used to @advantage in@:the, @ pr6duction oil an her,metice@lly sealed coliteiiner for dehydrated 'foo I ds 'or-the@like. I It Will'also be'observed tl-iat the@pres@ent bag 'Opening and transferring- rrechanism be 'u86d'wiih advantage for suppo@ting-@and transferring other 'Lypes of flat bags into a dein-o.nicating i@7ith the -open mouth portion@ o'L the '70 sited'ope@rative.position. ,the bag. In pass'mg betneen and beyorid' @ieed While:the ' Preferred embodiment.. of 'Lhe, invenr6llers, 3 01 12 and beyond 'the end of@ th6 @ipe IS, @tion has' been. herein' illustra ted'and described' it ,this bulged out relati_oiiship b6tweeri@@t-h6 wall's is will be understood:.that'.the invention may be,-embotitiriued 'due.to the relatively fixed@L br -8et-'po@i- bodied@'in'dther forms-'within thel@'scope-'of the '75 follow claims. @bAg @@niaterial a ovbr@-the 61% -6t @@'the li@@inL,-i