US2104814A

US2104814A - Process and machine for making window bags

Info

Publication number: US2104814A
Application number: US94580A
Authority: US
Inventors: George W Poppe
Original assignee: Equitable Paper Bag Co Inc
Current assignee: Equitable Paper Bag Co Inc
Priority date: 1936-08-06
Filing date: 1936-08-06
Publication date: 1938-01-11
Anticipated expiration: 1955-01-11

Description

Jan. 11, 1938. Q W, POPPE PROCESS AND MACHINE FCR MAKING WINDOW BAGS 4 Sheets-Sheet 1 Filed Aug, 6, 1936 INVENTOR 650,?55 W PoP/2E ATTORNEY` Jari.v 11, G, W. pOppE PROCESS AND MACHINE FOR MAKING WINDOW BAGS Filed Aug. e, 1955 4 Sheets-Sheet 2 1l||l||l l I I I Il I I I l I I l Ill lvIIIlIIL A .mm rl INVENTOR GEO/2 CFEv M/ ,Do/@Pf .Il III Jan. 11, 1933. G. W, POPPE l 2,104,814

PROCESS AND MACHINE FOR MAKING WINDOW BAGS Filed Aug. 6, 1936 Sheets-Sheet 5 Jan. l1, 1938. G. w. POPPE PROCESS AND MACHINE FOR MAKING WINDOW BAGS Filed Aug. 6, 1956 4 Sheets-Sheet 4 INVENTOR ATTORNEY Patente 9a. il, lg

George Poppe, Brooklyn, N. Y.,

Go. Inc., B

Equitable Paper fr. r.

neas

a corporation of New York Application Ast 6,

8 Claims.

This invention relates to so-called Window bags.

that is to say, bags i`n which an opening is made in one wall thereof which opening is usually covered by some transparent material by which the contents of the bag is visible. An object of the invention is the improvement of methods and machinery for cutting the windowd. opening in bags of this characterrin a manner which lends itself to high production.

It has been proposed heretofore to cut the window opening by means of a single die. It is diiiicult in practice to make cuts with a single die in 'a continuously advancing web with precision and rapidity. v

A feature of the present invention, therefore y relates to a, method of cutting a window bag opening whereby a plurality of dies are used. each die dening an outline substantially one-half of the portion to be eliminated from a wall in the finished bag, to form a window therein.

A further feature of the invention resides in a machine in which the window opening may be' made in either bag. Wall by the use of a plu- `rality of dies each die cutting out substantially one-half of the portion to be eliminated from a bag wall to form the window therein.

The invention will be better understood, by reference to the following description when taken in connection with the accompanying drawings in which:

Figure l is a generally longitudinal sectional view of a bag machine of conventional type illustrating one form of my invention.

Figure 2 is a plan view ofthe rear or right hand portion of the machine shown in Flgurel.

Figure 3 is a part elevation and part sectional view on the line 3-3 of Figure 1.

Figure 4 is a diagrammatic View showing the development of a bag tube with the window opening in the upper or seam wall thereof.

Figure 5'is a finished bag.

Figure 6 is a similar view to Figure 1 showing a modified form of the invention wherein the window opening is made in the under or plain wall of the bag tube.

Figure 7 is a portion of the right hand or rear portion of the machine shown in Figure 6.

Figure '8 is a part section and part elevational view on the line 8- 8 of Figure 6.

Figure 9 is a diagrammatic view showing the development of the bag tube with the opening in the under or plain wall thereof.

Figure 10 is a finished bag made according to the process and machine illustrated in Figures 6 to 8 inclusive.

1936, serai No. 94,580

`(ci. :aa-m

Figure 11 is the reverse side of the bag shown in Figure and Figure 12 shows the form of the chip or portion which is cut out of the bag wall.

Referring to Figure l the general framework of the machine is indicated at A2 and on this framework a shaft supports a roll of paper 5 from which is dravim a web 6 from which the bags axre made. This web is guided by a roller 8 and a second roller 9 to a roller I0 of hardened steel. At this point one edge of the web receives a line of paste indicated at l2, Figure 4, the paste being supplied by a paste roller i3 dipping into a paste pot M as is usual invmachines of this general character.

The type of bag produced, may be an ordinary `fiat notion bag. a bellows bag, or an envelope flap bag such asv is shown and described in my' Reissue Patent 19,921 granted April 7, 1936. For the purpose of illustration the machine shown, is designed to make the latter type of bag and since this bag is provided with a closing ap, the mechanism shown and described in said reissue. patent is employed herein for producing such nap. To this end a shaft I6 corresponding to the shaft 52,

' Figure 1 of said reissue patent, carries a pair of knives I8 shown also in dotted lines in Figure 2v herein, which make the diagonal cuts iri the web as said web passesover the roller iii, see Figure `4.' 'I'l1e mechanism concerned `with the present invention is designed to act on the web after it has passed the roller I0 but before describing this mechanism in detail, it may be stated that the Webpasses under a former 22 and is folded over the former to form a 'bag tube, the tube and web being drawn through the machine by means of feed rollers 2B mounted on upper and lower feed roller shafts 25. 'Iheweb is then subjected to the cutting action of serrated edge knives one of which constitutes the edge. of theA former andis shown at 26 and the other is carried bya lip knife shown at 28. Just prior to severance however, the tube is subjected to the acv'tion of pinch bars 3,0 which momentarily-retard the web while at the same time a striker bar 32 carried by a sprocket chain 33 gives the tube a sharp blow from beneath thereby severing the tube into an individual bag section. The severed bag section then passes to the bottoming mechanism which includes the tucker bar cylinder 34 carrying a tucker bar 35 and a paste bar 36. The bottom of the bag is tucked into a clamp indicated generally by the character 38 carried by the clamp cylinder 39. The paste bar ,36 cooperates with a paste-applying roller 40 receiv- 2 aioaeie ing paste from a paste pot'ili. The nished bag passes between the rollers d2 and 43 which fold the bottom and deliver the bag to any form. of delivery mechanism. The pinch bars are driven one revolution for each bag. The lower pinch bar shaft receives motion from some prime mover and from it the other parts of the machine derive their motion.

A sprocket carried by the lower pinch bar shaft transmits motion to a sprocket chain 44 whence motion is transmitted to the shaft 46 carrying a suitable sprocket about which the sprocket chain passes.

The mechanism above described is the usual type of mechanism found in bag machines, some of the special features of which are shown and described in said reissue patent.

In order to make a window opening in the finished bag, the web 6 after passing the roller Il) passes under an idler roller 48 which is mounted on a shaft 49.' The web then passes over a hardened roller 50, Figure 3, and during its passage thereover is subjected to the action of the window forming dies 52. Each die 52 is carried by a block 53 on a shaft 54. Each of these dies is so positioned as to cut notches in the edges of the advancing web equal to substantially onehalf of the outline of the completed window opening. The form of opening shown in Figure 4 is that of an oval, each die however, cuts a notch which is slightly more than one-half of the oval so that when the web is folded as indicated in Figure 4, the upper or seam wall of the tube in its overlapped condition will meet in such a way that a completely symmetrical opening is produced in the bag'tube. 'Ihe left hand portion of Figure 4 shows a bag section after it -has been severed from the tube and ready to be formed into a nished vbag shown in Figure 5.

'Ihe roller 48 is spaced slightly from that edge of the web having the paste line I 2, otherwise paste would be smeared on the roller.

The cut-out portion or chip formed on each side of the web is disposed ofv by means of a pair of cylinders 56 adjustably mounted on a shaft 58,

said cylinders being in alignment with the blocks 53, Each cylinder carries a tucker blade 59 which is operated in such timed relation that'the movement of the web with the chip is engaged by the tucker blade and forced into a clamp 60 in the cylinder 62 mounted on the shaft 63, Figure 1. The clamp 60 is operated in a manner similar to the clamp 38 by well known cam mechanism not shown, but the timing is such that the clamp releases the chip as the,clamp on the cylinder 63 reaches aV position such` that the chip may conveniently fall upon a deflecting plate 64 which guides the chip towards the bottom of the machine where it may fall upon the oor or be received into a basket or other suitable receptacle.

The shafts I6, 54, 58 and 63 are driven in such relation to the pinch bar shafts that said shafts make one rotation for each bag madev by the machine. For driving the shafts a gear 66 is carried by the shaft 46 which gear engages a similar gear 68 on a shaft 69, the latter shaft carrying a sprocket 1l). The shafts I6, 54 and 58 also carry sprockets about which a sprocket chain 'I2 passes for driving all of these shafts in the proper direction and in the same ratio. A roller 14 adjustj ably supported in a bracket 16 provides means for taking up slack in the sprocket chain 12.

By providing a pair of dies operating as described, the web is cut at each edge, the cuts properly joining to form a symmetrical opening when the web is folded.

By the method and machine described, the

window opening is formed in the seam wall of the finished bag. In the form of the invention, shown in Figures 6 to 1l inclusive, however, the window opening is formed in that portion of the web which constitutes the under-side of the bag tube as it passes through the machine and constitutes the plain wall of the nished bag. The same reference characters are used to designate like parts in these figures as are used in the rst described form.

As in the first described form of the invention, the web of paper 6 is drawn from the roll 5 and passes under the guide' roller 9 and over the hardened steel roller I8 where it receives the diagonal cuts for forming the sides of the closing flap of the bag. The web also is folded in the way previously described by passing under the former 22 being drawn along by the feed rollers 2st and being subjected to the action of the striker bar 32 which separates individual bag sections from the main bag tube. The pinch bar mechanism and the mechanism for bottoming the bag are the same as previously described.

In the present form of the invention, however, the window opening is in the plain wall of the finished-bag and`consequently the cuts to form this opening must be so located in the web as it passes through the machine that they will be on the under wall of the tube after the web is folded. In the present form, therefore, the web is subjected to the action of two dies mounted on il separate shafts, the shafts being indicated as 8U and 82, Figures 1 and 2. The

die cylinders

83 and 84 are located centrally of the web width and are each longitudinally adjustable on their respective shafts in order to properly position them for webs of different widths. Each die cylinder carries a die 86 which in the form shown is a little larger than half of the portion to be cut from the web to form the window opening in the finished bag. 'Ihe ends of each die make a cut which will be slightly overlapped by the cut made by the succeeding die. The outline of these cuts is indicated in Figure 9 and the overlapping feature is best shownY in Figure l2. It is to be particularly noted, however, that the overlapping cuts do not show in the window opening because they are produced in the chip which is discarded. The mechanism for disposing of the chip is similar to that shown in the first described form and lncludes the tucker cylinder 56 carried by the shaft 58 and having a tucker blade 59 which tucks the chip into the clamp 60 carried by the clamp cylinder 62. There is, however, only one tucker blade cylinder 56 and one clamp cylinder 62 in the present form and these are located substantially central of the web.

with a sprocket chain 12 as previously described.

What I claim is: A

1. The method of making a window bag which consists in making cuts in a web of paper each cut defining an outlineysubstantially one-half of the portion to be eliminated from the bag wall in the nished bag to form a window therein, folding the web to forma bag tube, severing the tube into bag sections and bottoming successive sections with the cut-out portions intermediate the ends of a bag section.

2. The method of making a window bag which consists in making cuts in the side edges of a web of paper, each cut defining an outline of substantially one-half of the portion to be eliminated from one wall of the iinished bag to form a window therein, folding the web to form a bag tube severing the tube into bag sections with the cut-out portions intermediate the ends of a bag section, and subsequently completing the bag' in known manner. 1

3. 'Ihe method of making a window bag which consists in removing a portion of paper from each edge of a web of paper thereby leaving gaps in the web. each gap being substantially equal to one-half of the window opening in'the wall of the ilnished bag, folding the web so that the edges slightly overlap and the gaps form a com- 'plete window opening in a tube, severing the portions intermediate the endsvof a bag section, and subsequently finishing the bag by known means v .-5. The method of making a window bag which consists in making cuts in a web of paper within the side edges thereof, each out defining substantially one-half of the portion to be eliminated from one bag wall to form a window therein, folding the web to form a bag tube with the cut-out portions in one wall thereof, severing the bag tube'to form bag sections and bottoming each tube section.

6. In a machine for making window bags, the combination with mechanism for making a bag tube from a web of paper; oftmeans for cutting a portion from each side edge of the web prior to folding the same into a tube, the cuts being so located as to form a window opening in the bag tube wall when the web is folded, means for severing the tube into bag sections with the cutout portions intermediate the-ends of a bag section and means for bottoming each section to form a bag.

7. In a machine for making window bags, the combination with mechanism for making a bag tube from a web of paper; of dies for cutting the web located within the side edges\of the web, each die having the shape and size to define substantially one-half'of the window opening.

8. In a machine for making window bags, the

have their ends'overlapped, -each die having the shape and size to define substantially one-half of thewindow opening.

GEORGE W. POPPE.