US995473A - Paper-bag machine. - Google Patents

Description

APPLICATION FILED FEB.7, 1901.

W. A. LORENZ. PAPER'BAG MACHINE.

Patented June 20, 1911.

7 SHEETS-SHEET 1.

1L 1 9 1 0, 2 6 n u J d .Lw n, m D.. .L o w um amm NEE EMF Mm ARM |EM WPA AG P P A SEEVETEL-.HEEET 2.

WLA. LORENZ.

PAPER BAG MACHINE. APPLIUAVTION ULEI' Imm. 1901.

Patented June 20, 1911.

'.Fig. 3.

Wnesses: Inventor.'

W. A. LORENZ.`

PAPER BAG MACHINE.

ArpLmAToN FILED PBB.7,1901.

995,473, Patented Junezo, 1911.

7 SHEETS-SHEET 4.

Fig. 4f.

fiznesses: Inventor:

w. A. LORENZ. PAPER BAG MACHINE.

y APPLIUATION FILED 113.11901 Patented June 20, 1911.

' 7 BHBETB-SHEET 5.

Witnesses: Inventor:

W. A; LORENZ.

PAPER BAG MACHINE. APPLICATION FILED m1111901.

atented June 2,0, 1911.

7 SHEETS-SHEET 6.

W. A. LORENZ.

PAPER BAG MACHINE.

` AVPPVLIGATION FILED 111113.11901.

Patented 11111020, 1911.

'T SHEETS-SHEET 7.

Ifn've ntofr:

W151i ne wes:

@E QM.' @17% wf/Lmhfitmay concern.'

UNITED srArEs PATENT oEEIcE.

WILLIAM'. A. LORENZ, OF HARTFORD, CONNECTICUT, ASSIGNOB T0 UNION PAPER BAG MACHINE COMPANY, OF PHILADELPHIA, PENNSYLVANIA, .A CORPORATION -OF PENNSYLVANIA.

PAPER-BAG MACHINE.

Specification of Letters Patent.

Patented June 20, 1911.

Beitkaewnthatnwamm Ammin,

a citizenfofthe United States, Vresiding at- I-Iartford, in the county of Hartford and State ofI Connecticut, Vhave invented cer-tain new kand useful Improvements in Paper- Bag 'Machined of which the following is a full, clear, land exact specification.

rl`his invention relates to paper bag ma` chines and more 'especially` to -that class thereof in which Vsquare bottom bags are formed from bellows-'sided or tricked tubing, and it has for'one of its objectsthe'provi sion of a machine-.of this type whereby the so-called diamond fold is formed in an easy and rapid manner preparatory to having itsflaps supplied with p ste and folded to complete the bag. l

My Invention comprises as one of its features` ablank-foldingV member having a denin edge which is maintained at a substantial distance from the blank-supportingV surface or foldinofbed of `a suitableblank'- 'carrier during the diamondforming pe- 1iod,'so that the machine may be operated. at a hi h; rate of speed without liability Lof wrinding or otherwise damaging the material, especially at that time when the tucked sides arebeing pulled out or stretched out by the coaction of the devices whereby the upper andlower plies of the blank are engagedl Myinvention has, furthermore, for its object an improved construction of't-he defining member and its operating mechanism, said member being mounted for revolution around the axis of, and with, a rotary blankcarrier.

.My invention comprises :blank-folding members coperative with suitable blankengaging devices, said 'members consisting tion to serve as a medium around which the diamond. a

A, further object of my Invention may be font4 in the provision of means whereby the frat-nt diamond fla-p is formed and held, and: aided in a predetermined path relative to- ,blank is opened out and folded into the -bellows-sided tubing into the inthe presentfinstance, of?,

the surface of the blank-carrier so as vto relieve the strain upon the material and to deliver the said flap to otler devices upon the completion of the diamond. This feature of my invention comprises .a sweeper vfinger or similar device, theblank-engagmg point of which is mounted for movement toward and from, and-advanceable with,the carrier during the diamond-forming operation. Further objects of my invention reside in the improved constructionandor', anizations of the various devices whereby t e blank is engaged during its manipulation, as-'will be herelnafter' described and particularly pointed out inthe claims.

In the accompanying blank-engaging and folding devices arel similar` en both sides of thecenter line. so

l drawings, inf which .snm-lar characters designate similar parts,4 only a portion of a machine embodying my noted here that the blank-carrier' and the" that, in the followings j cification the 'de- 'scription of one'sidewi Ianswerfor both.

Figure l is a top view of a machine built i in, accordance with my invention. Fig.' 2 4is a central longitudinal Section thereof. .Fig 3 is a vertical cross section on line 3 3 Fig. 4: is a similar section taken on line [4 4 of Fig. l; Fig. 5 represents a similar sec'- tion on line 5 5 of Fig. f1. Fi

.e-toeimy .elusive are diagrams illustra-ung in front views the operation inthe movements. of theA4 folding devices relative to the blankfcarrier;

Fig. 10 is afractionalsideviewof the blankcarrjier and showin the blank 'after'. ithas i been formed 'into t e 'box. Fig. 11 is' n nfront view of the blank shownin Fi 10 Fig. 12 is a view similar'to Fig." 10and1l1us trates the blank after the diamondha'sbeen.4 'i l" I substantially completed, and Fig- 13 is' a front view of the' In the drawings, 20 designates the bed .plate of the machine' .to which are secured .upright side frames 21 in which' the several blank shown inFig. 12.

coperating parts and shafts for driving the various devices are sup means are provided for feed-lng blanks or machine such means consistin ported. Suitable u 'los suitable'feedlro ers 22 and mounted on@ shafts -24 4 and 25 y.respeenmalig.y .the glatter infr journaled in movable boxes 25 in the si e frames. The feed rollers are caused to coperatie with each other' by means of gears 26 and 27 mounted on the shafts 24 and 25, respectively, and they are driven through an intermediate 28 which is journaled on the stud 29 held in the side frame 21, such intermediate 28 receiving proper movement from a gear 30 which, in turn, is driven from a pinion 31 mounted on a shaft 32, which constitutes the driving shaft of the machine and to which power may be applied from any ordinary source. From the feed rollers the blank or tube is conducted to\a suitable carrier serving as a support and folding bed for the blank during the bottom or diamond-forming operation. Connected f r coopera-tion with the carrier are devices or engaging the upper ply of the tube or blank, while suitable means are provided for holding the lower ply of the tube or blank in vplace on the carrier, the organi'- zation of said devices being such as to open out the open end of the blank and form the diamond as will hereinafter appear. The carrier is, in the present instance, of the rotary type and consists substantially of a cylinder such as 33 mounted for rotation around the axis of a shaft 34 which is preferably stationary in the side frames 21 and upon which a number of movement-imparting devices are sup orted. The cylinder 33 comprises substantially a cylindrical shell secured to the head 35 of a hub section 36;

while said shell '33 is provided with .a similar hub' 36", the ccistruction'and function of which is the same as that of the hub 36-I so Jhat-the description of one is applicable to oth.

The hub 36 is composed of a plurality of bars 37 the outer and free 'ends of which are united and held by a spider 38, and which, between each. pair of adjacent bars thereof, form ways 39 adapted to receive slides 40 .the number ofV which corresponds 'to the number of folding beds for the bag blanks to be operated upon during one rotation of the blank-carrier, in the present instance three being shown. The spider 38, just mentioned,`is provided with a hub 38 which is loosely journaled on the shaft 34 and to .which the-gearBO, above referred to, is secured, so that by rotating said gear 30 in the manner above described, proper movement will be imparted to the carrier 33.l

The 'means for holding the lower ply of the tube on the carrier consists preferably vof apair,of'tuck-holders41, 'ournaled at 42 on the carrier, and' having ro -receiving portions 43. on which cam-rollers 44 are journaled; -These cam-rollers travel in engagement with suitable cams 45 secured upon the shaft 34 .which cause said-tuck-holders to release the blanken both sides simultaneously imd'atlfthf proper time; while a spring, such as 46 (sce Fig. 6), may be employed for causing said tuck-holders to enga c the blank. Organized for cooperation with the tuck-holders 41 are box-holders 54 (Fig. 1) each of which is preferably and coperativcly connected with a clip 53, and has lugs 55 for pivotally receiving a spindle 56 upon which said clip 53 is 'journaled, and which also carries a .member 57 one edge of which,

l58, serves as a delining ed e,'both the definmg member 57, and the cip 53 being separately acted upon to close against the boxholder 54 by suitable springs 59 and 60, respectively. The box-holder 54 'constitutes a blank-folding member secured to, or forming a part of a head 61which is secured to a spindle 62 (see Fig. 6 journaled in aframe 63 (see Fig. l) an the other end of which carries a pinion 64 in( engagement with a gear 65 whereby proper movement is imparted to saidpinion'64 and which, in turn, is operated'by' a bevel pinion 66 secured thereto and loosely mounted upon a spindle 67 which is journaled in the lugs 68 of the slide 40` above mentioned. The bevel pinion 66 maybe operated by a sector 69 carried on a spindle 70 which is journaled in an ear 71 forming a part of the slide 40 and to which proper oscillatory movement may be imparted through an arm 72 having a cam roller 7:3 in engagement with a suitable cam groove 74 provided in the cam 75. As has above been mentioned, the .main shaft 34 of the machine is stationary in the frames 21, and the cam 75 is preferably mounted on said shaft 34 so that as the spindle 67 in the slide 40 is revolved around the axis of said shaft 34, the sector 69 may be properly actua-ted by the camroove 74, and

.-will o'sclllate the spindle 62 an consequently the box-holders 54 in the proper manner. By

referring to F ifrs. 4 and 6 it will be seen that the operation of the clips 53 and the defining members 58 is governed by pins 47 and 48 respectively, supported by arms 49 which may be secured to the frames 63 so that when the box-holders 54 are caused to oscillate around the axis'of the spindle 62, the sprinvs -59a"n d 60 will close the clips 53 and the dening members 57 inde endently of each other and against the blan, moving said parts from the position of Fig. 6 to that shown in Fig. 7. In addition to this oscillating movement the box-holders 54 and the defining member 57 are also organized for a rise and fallfmovement bodily relative to the blank-supporting surface of the carrier in order to position the box-holders and the defining member properly to receive the blank, and, furthermore, 1n order to maintain the upper and lower plies of the blank at a distance from each other, or more properly speaking: to preserve the defining edge 58 at ajsubstantial distance from said car- .rier surface during the diamond-forming opiaoi.i

sweeper device, designated ina general way eration. This result is obtained by imparting to the frame 63 a swinging-movement around the spindle 67 as an axis, said spindle being secured to the frame and carrying '5 at o ne end Ian arm 7 6 the outer end of which may be connected by means of a link 7 7 with an arm 78 having a hub portion 7 8 which is journaled in one of the ears 68, and sidewise movement ofwhich may be prevented by a shoulder 7 9 and a nut 80, as is clearly shown in 2. The arm 78 is operated, in the present instance, by a shaft 81, journaled in the head ofV the carrier casing 33. and havin secured thereto a lever 82, the lower 'end of which carries a roller 83 in engagement with a suitable cam 84 preferably secured tothe shaft 34 above mentioned.

Froml the foregoing it will be seen that comparisonv of Figs. 8 and 9, theformer of whichllustratessaid member in its opera- 18.0{tive or inward l shows ysaid mem er retracted to clear the osition, while .the latter blank on the carrier. This movement is due to therbperation of the slide 40 which, as -lias been reviously stated, is guided in Ways 39fforme by each adjacent pair of bars 37. The slide40 has preferably' at its under sfide 4 a roller 85 journaledLon a stud 86 and in en ,ga ementwith a cam groove 87 also provi edl in thecam 75, above mentioned; and, in order to allow-for this movement of the slide 40, the arm 78 whereby the frame 63 is operated has preferably a spline connection '.with its operating spindle 81 (see Fig. 2). One -o'f'the .features of my present inven- -tion resides in the provision of means to form the front diamond-hap and hold it in desired relation to the lsurface of the blankcarrier, during and especiallynear the end 'of the diamond-forming operation. These means consist, in the present instance, of a 4by S,rtl1e movement of which relative to the carrier `is in a predetermined path, and such gsthatjit will engage the 'flap end during the box'l and diamondy folding operations. By 'y comparison .fof Figs. 4,I 1Q. and 12, several positions the operationof the sweeper' iin- .Ag'erriayibe clearly seen, the operating meclr Iso anismfof the' device being soo'rganized as to ermitthe boxfwhich isshown in lOto y forinedwithout Vany strain being .br'ughtto bear u 4on the front flap," yvhile,

astlie'tuc ed'lside's'fof the'l tube are llyl stretched: out, the end ofthe sweeper 5 finger `wi1lfornrfthe front'ilap of the dia- 'folded to complete the bag.

each folding member 53, 54 and 57 has, as, far as described, two distinct movements,

shape of said complete osci lations -of the aria 90v relaf: tive to the blank-carrier surface during each" mend, carry it toward the blank-carrier and to the position shown in Fig.` 12, when said flap will be enga 'ed by a device whereby the blank is retaine on the .carrier and subsequently brought into contact with other devices thereby to be supplied with. paste and The sweeper device S consists substantie Iof a former and holder finger 88 pivoted at 89 onan arm 90 which constitutes a carrier therefor, and

which is adapted for oscillation toward and away from the blank-carrier. The finger 88l is provided with a rearward extensionv 88',

the endv of which isconnected by a link 91 to a crank arm 92 secured to one end of a shaft 93 the other end of which carries a lef In order to guide the end. of' the'iinger 88 in the manner abovedescribed, the finger carrier is also mounted for oscillation,I and in the drawings it isshown as being mounted upon a sleeve 101 which is jour# naled in bearings or standards 102, while said sleeve itself-answers forra bearing for the' shaft 98 above referred to. 'Ihe outer end of the sleeve' 101 carries an arml`103, the outer' end of which is connected by a link 104'to a lever 105 which is also fulcrumed .on the stud 97 and to which proper -vibratory movement may be imparted by a groove 106 provided therefor in the side of the cam 100, and engaging a camroller 105', and the oove is such as to cause' two diamond-forming operation, the first oscillation taking place as the finger 88 moves from the osition shown in Fi 4 to that shown in ig. 12; and the secon i oscillation being caused during the-return stroke of the linger 88 to' theosition-1 lshown in Fig. 4. The path which 1s described by the en d .of the linger 88, during the diamond-forming operation, 'and more particularly whengoing ,from the position ofV Fig. 10 to that shown in Fig. 12, is'of s ch afnature as to cause thefiap end of the blank to be 'gradu-z ally carried toward the blank carrier surface without subjecting the blgnk t0 excessive strain. It will thus be observed that the'l 'operating end of the. sweeper finger 88 controls the position ci the Hap end ofthe lower ply of the blankduring the diamond forming operation while permitting the portions subjected to strain to rise from 'the blank mevemeiltb'f the upperply. so as. tjoj insure uniformity both in time and l Supporting surface of th'e blank carrier, from .thelposition shown in Fig. 4 to that of Figs:. f. a nd 11, following) the backwardut more slowly,

the opening movement of the blank li e form, which might other at ,uni 'forn'1ity,'due to the plies matted'to'gether, or to differences in 10 -the amphess or stillness or lother characteristics of the paper.

The means for holding the front'flap of th dia-mond to the carrier consists, in the. present instance, orf a front diamond holder 107 "ivotedat' 108 and having an arm 1099 on t e outer end of which is a stud 110 pivotally supporting a roller lllia'dapt'ed for engagement with ay cam 112 which is preferably stationary and also mounted upon the shaft 34 above mentioned. The cam'112 "Willtherefore engage the roll'lll during the rotation of the blank-.carrier and -openv said holder 107, against the actionI of a spring 113, for receiving a blank Hap after the dial --m0ndhas-been substantially completed, and

for subsequently releasing the saine-after the blank hasbeen'car'ried into contact with other devices, as for instance, a'dro'p plate 114, see Fig.' 3,' whereby the dlamond is -[jlat- '30' Atened .andl which is secured to the end of an arm 115 journaled at 116 in a bracket 117 secured to thelbase 20 of the machine. -The arm 115 carriesa-stud 118 on whichis journaled a roller 119 adapted to be engaged by 3 5 a. cam'120 -mounteduponth'e driving shaft 32 o'f the machine andwhereby said arm 115 Ais swung outward,'while aspring 1,21 may be emplo ed for forcing-the drop plate 114 against t e blank onf` the carrier thereby flat- '40 4tening said blank preparatory to the latter gfold'edi to complete the bag.

`"being broughtinto Contact with a presser roll such as 122 mounted on said shaft' 32,

i after which a late such as'123 may be employed for de ectingthe blank which may then have' its flaps supplied With paste and The operation of myv improved 'machine 'is as lfolle-Ws:'Bellows-sided or tucked tub- .in'ggis introduced into the machine by Athe '60. "eed'--rol'ls 22 Aand23, and guided into po- "sition, @n the bla'nkcarrier 33'. The boxholders 54,"theclips 53 and the .tuck-holders 41, and also :t-he defining member 57 are then brought into position shown in Fig.

551 6, lviz'ji-I; the `tuck-holders holding the lower ply ef'rvthe'blank to the carrier; while the boxholders54 enter the tucks, and the ,clips Vandftlitdefining member 57 come to a position above' the upper ply dthe ,blank o' as clearly shown..

35 springs59, Gil-to actuate the' clips 53 and above referred to. As the rotation of the carrier 33 is now continued, a further os- `cillaton-of the box-holders will take place around the. spindle 62; While at the same -time said spindle will be retained substan- `tially in position so that the dening edge 58, which during its; operative position 1s in alinement with the axis of saidspindle 62 may be maintained at a distance from the carrier during the diamond-forming op eration, and until the position shownz 1n Figs. 10 and 11 has been reached,at which time=the so-called."box has been formed.Y

At or about the 'position shown in Fig. 4, the end of the sweeper finger4 88 enters the front end of the blank above thelower ply,

and controls the movement of the latter,

permitting it to follow the turning back movement of theupper ply, but more slowly,

to the'position'shown 1n Fig. 10. It will generally be lfound that at this stage the distance 4between the points of engagement 'of the blank by the tuck-holders and boxholders is substantially equal 'tothe tucked y side Which is now in substantially distended Thel front diamond holder 107.

condition. l having been opened-sufficiently by lthis'- time, a further rota ion on the part of the blank .carrier 33 and also of the' cam 100, will re sult in actuating the end ofthe sweeper finger 88 to force thefrout flap end toward the carrier and into. position, to,v be engaged. by said front' diamond holder 107 Vas shown in' Fig. 12, .this movement taking place'very gradually so as to avoid all excessive strain on the material. The diamond has now been substantially completed, -as shown in Fig. 13, and it will also be noticed that the defning edge has approached the -blankcarrier during this time, so that lthe tube plies arenow in closed condition, and the diamond may now be flattened by the drop plate 1 14. The box-holders y54 with the clips 5:3, and also the defining edge 57, may now be Withdrawn from the blank, this movement taking place Vduring the further Vrotation' Aof the carrier, when the slides 40-are moved outward by the cam grooves 87 Vof the .cam 75, the other groove 74 of which is so shaped that While said slides 40 are moving outward, the arms 72 actuated by said groove 74 will not change their positions relative to. lthe slides. defining members may, therefore, be withdrawn sidewise from the blank wit-hout any oscillatory movement whatever, the opera" tion just described bein clearly illustrated in Figs. 8 and 9, 'the former of which shows the several, parts in their inward but re- The box-holders, clips and -bodily outward. As soon as the slides 4:0 have been fully withdrawn, the cam groove 74' becomes effective to return the boxholders 54:, with the, clips 53 andthe defining members 57 carried Ythereby, into their original position, ready to engage a new blank which may be-presented for operation.-

The carrier 33 is illustrated in the drawings as having 'three folding beds and three sets of blank-engaging and folding devices, `their number depending, of course, upon the size of the carrier and upon the length of the bag blank to be operated upon, and ity is therefore evident that this number of de- 15 vices may be changed to suit different re y quirements Without in any way departing y from the spirit of the invention.

It is also obvious that many changes may be made in the construction and mode oi?y operation of the several devices illustrated, and, therefore, I do not limit myself 'or' confine my invention lto the precise form thereof described and shown in the drawings.

Some features of invention shown and described' but not claimed vherein are claimed inmyPatentNo. 840,073, granted January 1st, 1907,011V an application which was copending with this application. In so far as this `application and my said Ipatent show common features of novelty I intend that this application shall be subordinate to said patents." Y e Having described my invention what I claimas new,l and desire to secure by Iletters Patent is V1. In a papel bag machine the combination ywith aV rotatingr blank carrier of tuck holders coperating therewith to hold the i lower plyV of a bag blank on the carrier, members mounted forcontinuously advancing `movement with theyblank carrier and having a deiinin edge, means for turning the upper ply-o' ja bag-blank about.- said de- 7 fining edge, and'` means for maintaining said defining edge ata substantial distance from 5 the lower ply of the blank during a con- Jsiderable portion of the operation of ,turningback said upper ply about said defining edve.

r2. In a paperbag machine, mechanism for forming diamond folds on bellows sided blanks, having in combination a rotating bag blank `carrier forsupporting the lower ply of the blank, transverse fold defining members having defining edges, revolving frames for supporting said vdenning mem" bers, means for causing the upperply of the blank to be turned back. about said defining edgesand means for moving the revolving frames toward and'from the blank carrier and larranged tomaintain the said edges at 'i bitanti'al distance, from said lower ply yaconsiderable portion of the opera- Vio lio

dur

-.-;; of back the' upper ply. B5 u "3J'Ina` paper vbag machine, vmechanism for forming diamond folds on bellows sided for forming diamond folds on bellows sided blanks, having in combination 'a rotating blank carrier, tuck holders cooperative therewith to hold the lower ply of the blank, two transverse fold defining Vmembers mounted for movement over the blank toward and away from each other, means counting with said defining members vfor `turning back the upper ply of the blank, and means for maintaining said defining members at a substantial distance from said lower ply during a considerable-portion of the turning back operation.

4C. In a paper bag machine, mechanism blanks, having in combination a `rotary f blank carrier, tuck holders coactive there?` with, two transverse fold defining members, each having a Ideining edge, means for moving said defining members over the blank toward and away from each other, means coactive with said defining members for turning back the upper ply of the blank to form the diamond fold, frames for pivy otally supporting said members, means foi' 90 oscillating said members in their frames', and means for moving the said framesto maintain the defining edges of the members at a substantial distance from the blankcarrier during the diamond forming operation. 95.

5. In a paper 'ba-g machine, mechanism for forming diamond folds on `bellows sided blanks, having vin combination a .rotating blank carrier, tuck Vholders `coperative therewith'to hold the lower ply ofa` bag 100 blank, mechanism for turning back the up-` er ply ofthe blank, including cross fold efining ymeans and support-ing means for said cross fold defining means mounted for revolution around the axis of the blankcar` 1`0 54 rier, and means for moving said supporting means radially toward and away from the blank carrier during said revolution.

6. In a paper bag machine, mechanism y for forming diamond folds on bellows sided 11` blanks, having yin combination a rotary blank carrier, tuck holders coacting there-y 'witln frames mounted for revolution with the blankcarrier and mounted for swing-y ing movement toward and from the` axis of` the blank carrier, heads mounted. for oscilf lation on the said frames, and box holders carried by said heads and disposed at opposite edges of the blank. l

7. In a paper bagmachine, means for forming diamond folds on bellows sided blanks, havingl in combination a rotating. blank carrier, tuck holders co-acting therewith, frames carried by the blank carrier and mounted for swinging movement 7- to-'l` 125 Ward and away from the axis of the blank carrier, cam mechanism for givingy said Vframes such swingingmovement, heads pivotal'ly supported in saldl frames, means for 7 lturning said heads in said frames and cross 13.

fold defining'l members and box holders carried by the heads..

A 8. In a paper bag machine, mechanism for forming diamond folds on bellows ysided blanks, having in combination a rotary blank carrier, tuck holders coactive there- Vwith, frames mounted upon oppositesides of the `carrier for revolution therewith, for movement toward and from each other on opposite sides of the carrier, and for rocking movement toward their axis of revolution, box holders mounted for oscillation Vupon the said frames, and driving means for l impartingfthe designated movements.

.9. In a paper ,bag machine, mechanism vfor forming diamond folds on bellows sided blanks having in combination a rotary blank carrier, tuck holders, slides mounted for revolution with the blank support, and for movement toward and from each other on opposite sides of the blank support,-

frames mounted upon the said slides for .rocking movement toward and from the axis for forming diamond folds on bellows sided:

of the blank carrier, and means carried by .the Said frames for engaging and turning back the upper ply of the blank to form the diamond folds.

10. In apaperbag machine, mechanism blanks, lhaving in combination 'a rotary blank carrier for supporting the lower ply of the blank, tuck` holders, means` for turning backthe upper plyfof the blank, a iinger for engaging thefront end, of the lower ply of the blank, a linger carrier for supporting said linger, means for moving the linger carrier awayfrom and toward the blank carrier in proper time relation to the rotation of the blank carrier, a front diamond holder, and means for causing it to engage the front end ofthe blank at the conclusion of the diamond forming operation.

11. I'ha paper bag machine, mechanism for-forming diamond'folds on bellows sided blanks having in.` combination a rotary blank carrier for supporting the lower ply of the blank, tuck holders, transverse fold defining members and means cooperative therewith for engaging and turning back the upper ply of the blank, a finger mounted )for movement into the mouth of the blank and onto the lower ply thereof, a finger carrier for pivotally supporting said finger,

means formoving the finger carrier away from and toward the blank carrier, and means for oscillating the said finger upon its carrier.

12; In a paper bag machine, mechanism for forming diamond folds on bellows sided blanks, having inv combination a rotary' blank .carrier provided with tuck holders, oppositely disposed defining members and means cooperative therewith for turning back the 6.5 upper ply of the blank, a linger mounted for movement into 'the mouth of the' blank and onto the lower ply thereof, means pivotally supporting said finger for oscillation in theggeneral direction of travel of the blank support, and means for moving said pivotalgsupport to carry the linger toward and from the rotary blank carrier in proper time relation to the rotations thereof.

13. In a paper bag machine, mechanism for forming diamond folds on bellows sided blanks, having in' combination a rotary `blank ca'nrier for supporting the lower ply. of the' blank, tuck holders, a front diamond blanks, having in combination a rotary blank carrier for supporting the lower ply of the blank,ltuck holders, means fr turning back the upper ply of the blank, a front diamond holder appurtenant to said blank carrier, a 'finger for engaging the forward end of the lower ply of the blank, while permitting it to follow the movement of the turned back upper ply, a-fnger carrier for moving the ingeraway from and toward the blank carrier, and a caml and its connections for oscil-A lating the said finger in its carrier. y

v15. In a bag machine, a traveling folding bed,- tuck holders, mechanism cooperating therewith for engaging and turning back the upper ply of a bellows sided bag blank, a Y

linger, means for causing the finger to enter the` mouth of the blank to engage the lower ply thereof and control its position during.

said turning back operation, while permittingvparts thereof under strain to rise from; the bed, and means for engaging the front end of the blank and ypressing it down 1 against the bed at the end of said turning back operation.

16. In a bag machine, a'traveling folding bed, tuck holders, mechanism cooperating and turning backv therewith for engaging the upper ply of a bellows sided bag blank,

a finger, actuating mechanism therefor, ar-

ranged to cause the finger to enter the mouth of the blank and engage the lower ply thereof, to control its position during saidv turning back operation, while permitting parts thereof under strain-to .rise frointhe bed', and a clip for engaging the front end of ,theblank' and securing it to the bed at the end of said turning back operation.

17'. In a bag machine, the combination of a rotating folding bed. means for holding the lower ply of a bag blank thereon, means for turning back the upper ply of the blank,

and means for controlling the front end of the lower ply, comprising an arm mounted for oscillation toward and from the blank, a linger mounted for oscillation on the said arm, and means for actuating the arm and. the finger to carry the finger into the mouth 0f the bag blank, and on to the lower ply ther of as the blank is carried forward `by theiiiolding bed during the diamond folding operation. i

18. In a machine for making bags out of bellows sided blanks, a traveling folding bed, meansfor securing the lower ply of a bag blank thereon, a gripper carried by the bed for the front end of the blank, means 1 for engaging and turning back the upper ply of the blank, a finger, and means for moving said finger relatively to the bed to cause the linger Vto enter` the front end of the blank and engage the lower p'ly thereof and hold saidvend in position to be engaged by said gripper at the end of saidl folding operation. e,

19. In a bag machine, diamond folding mechanism including a'folding bed having a curved surface, tuck holders, mechanism for turning backl the upper ply of a blank, a sweeper linger' supported .independently of the folding bed adapted to engage the upper side of the forwardend of the lower ply of the blank, and means for moving the finger relatively to the bed in a curved path approximating the curvature of the curved surface of the folding bed.

20. In a bag machine, diamond folding mechanism, including a folding bed, tuck holders, a front diamond .holder on the bed,

mechanism'for engaging and turning back the upper ply of the blank, a finger, and lmeans forl causinf,T the finger yto sweep the front; end of the b; ink into the grip of the bed surface, means for securing a bag blank against -said surface, means for turning back the upper ply of the blank, a finger engaging the lower ply of the blank, and means for moving the finger in a curved path approximating the path of the blank on the folding bed to maintain such engagement.

28. lin a bag machine, diamond folding meclninism, including a cylindrical. folding bed, means for securing the lower ply of y the bag' blank thereon, a front holder, means for. eifigagingand turning back the upper ply of a bag blank, a finger, and means for moving it into the front end of the blank to en# gage the lower ply ,and limit the rising movement 'thereof while carrying the linger forward in the general direction of the path ofthe blank on the bed to hold 'the front end of the blank within reach of the front holder,-

and means for causing said front holder to engage the front end of the blank after the formation of the diamond folds.

WILLIAM A. LORENZ.

, Witnesses:

Giras. F. SCHMELZ, NnLLrn PHOENIX.

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