US2730934A - Machine for manufacturing bags - Google Patents

Description

Jan. 17, 1956 Filed Jan. 6, 1953 L. VAN DER MEULEN MACHINE FOR MANUFACTURING BAGS 3 Sheets-Sheet l 1956 L. VAN DER MEULEN 2,730,934

MACHINE FOR MANUFACTURING BAGS 3 Sheets$heet 2 Filed Jan. 6, 1955 Jan. 17, 1956 L. VAN DER MEULEN 2,730,934

MACHINE FOR MANUFACTURING BAGS 3 Sheets-Sheet 3 Filed Jan. 6, 1953 United States Patent MACHINE FOR MANUFACTURING BAGS Leonard van der Meulen, Amsterdam, Netherlands Application January 6, 1953, Serial No. 329,857

Claims priority, application Netherlands January 8, 1952 13 Claims. (Cl. 93-18) This invention relates to means for manufacturing bags, similar tubular bodies and the like from sheets or Webs of material such as paper, regenerated cellulose and like materials.

Several processes and machines for manufacturing bags from paper and like materials are known in which the material is passed intermittently through a machine and folded around or in a moulding device such as a mandrel. Also known in the manfacture of bags by passing material continuously through a machine and moulding the true tubular form by folding this material with the direction of the passing as the axis to the tube, the longitudinal seam of which is formed by sealing the edges to each other in the direction of the movement of the material. The formed tubular object is then cut transversely to the direction of movement of the material, whereupon the bottom is formed by folding together once or twice, both ridges of one of the ends of the tubular body to a single or double fold and sealing this fold.

These known processes, however, are very restricted with regard to possibilities of manufacturing bags of different shapes. Thus, in the prior art, it is impossible to manufacture a plain bag such as, for example, with an inwardly folded rim at the bottom and an appointed shape of the opening by passing the material continuously through the machine. Further, no art is known to teach the mechanical manufacture of bellows-folded bags with a bottom which is seamless. So, in practice, such items are still manufactured manually. Additionally, the folded bottoms of the bags which were manufactured mechanically, in accordance with what was previously known, are not very strong.

it is an object of the invention to provide an improved means for manufacturing bags or similar tubular bodies of different types.

Another object of the invention is to provide a machine for the manufacture of bags or similar tubular bodies of different types which can be fitted to the manufacture of another type of bag .or similar tubular body by slight and simple modifications.

Another object of the invention is to provide improved means for manufacturing flat bags with a worked bottom rim having no extending parts or ridges.

Another object of the invention is to provide improved means for manufacturing flat bags or similar tubular bodies with a worked edge at the opening.

Still another object of the invention is to provide im proved means for manufacturing bellows-folded bags having a non-sealed bottom.

Other objects and advantages of the invention will appear more clearly from the following detailed description.

The accompanying drawings show by way of example some preferred embodiments ofthe invention without, however, limiting the scope of the invention.

Fig. 1 represents diagrammatically amachine accord- ,ingto one embodiment of the invention.

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Figs. 2, 3 and 4 represent the successive treatments of a web of material to a fiat bag according to some embodiments of the invention.

Referring now to the drawings and first to Fig. 1, the material is carried from the supply roll 1 over the guiding rolls 2 and 3 between the pasting rolls 4a and 412. These pasting rolls 4a and 4b are fed by the glue roll 5 with a glue from the container 22. The rolls 4a and 4b have a small breadth so as to apply small strips or glue to both edges of the passing material longitudinally to its movement. One of said stripsof glue may be continuous, as shown in Fig. 3, whereas the other strip may be discontinuous in order to obtain a fiat bag with an inwardly folded hem 24 at its bottom, the hem 24 being only at its front or rear side sealed to the adjacent wall. Thus the bottom of the bag is very strong. In this case the hem 24 is sealed to the adjacent front and rear walls. Obviously by modifying the pasting rolls other combinations of flat bags may be manufactured, such as a bag having a hem being sealed at each side to the adjacent wall, a bag having a hem not sealed at its opening to the wall, etc.

The hems 24 are arranged at one or both edges of the passing material longitudinally to its movement. If desired, however, flaps 9 (Fig. 2) maybe cut out in one of the edges of the passing material in order to obtain flat bags with a flap at its opening. The cutting of the flaps 9 corresponds to the working of the roll 9 of Fig. 1 designed in this case as a cutting roll.

If desired, a strip of another material or differently coloured material or a cord may be applied to the starting material in its movement.

After the folding of the hem orherns the material is passed over the guiding roll 25 and between the pasting roll 6 and the thrust roll 7. By the pasting roll 6 which is also fed by the glue roll 5, the strip of glue, for sealing the bottom of the final flat bag, is applied only to one edge of the material. The glue strip is applied interruptedly over a length equal to the breadth of the bottom of the bag to be manufactured. Drawing rolls 8 and 9 and a guiding roll 1% are preferably designed so as not to touch the strip of glue. However, it should be understood that this glue strip, applied by the roll 6, is omitted if only tubular bodies without glue strips at one of its ends are to be manufactured.

After being passed between these rolls, the material is cut to measure, by the rotating upper knife 11 and the stationary bottom knife 12, preferably in a scissor-like action, well known in the art, and imparted to the same by elliptical cog wheels (not shown) or similar driving means for controlling the variable speed of the upper knife in relation to the position of the knives. Measures are to be taken for effecting a correct feed of the material to these knives, for instance by guiding the material just before these knives. The separate sheets of material, thus obtained, are conveyed by guiding means 13a, b, c, d and 14 to the pasting and folding means of the rolls 26, 27 and 28 rotating in the direction indicated by the arrows.

The rolls 26. 27 and 28 pull the sheets of material out of the space between the guiding means 13a, b, c, d and 14. During the passage of the first part of each sheet between the rolls 26 and 27, a glue strip 30 is applied to this part transversely to the direction of its movement by means of a pasting border 16 of the roll 26, said border being guided in a radial direction if desired. The pasting border 16 receives its glue by means of a glue roll 21 from a container 23.

This first passing part of the sheet will eventually form with the opposite or end part of the. sheet the longitudinal seam of the flat bag to be manufactured. Instead of thefirst part of a sheet, obviously the end part thereof may be provided with a glue strip.

A folding border 15 of the: roll 26 pushes the material approximately at the rniddleof the length of the sheet, measured along the movement of the material, into a clamping and folding means or border 17 of the roll 27, saidfolding border being guided in a radial direction, if desired, for instance by an eccenter 50 connected to the shaft 51 of the roll 27. By the rotation of the roll 27 the sheet is pulled over guiding means 29 and carried between the rolls 27 and 28 which form the bottom seam from the folding flat of the corresponding edges.

When the thus folded sheet has nearly completely been passed between the rolls 27. and 28, the protruding edge of the sheet forming with the adjacent edge the longitudinal seam of the bag, is pushed into clamping and folding means 19 of the roll 28 by a folding border 18 of the roll 27, said border being guided in a radial direction, if desired. At the same time or shortly afterwards, the folded sheet 1 is released from the olamping means 17. By proceeding with the rotation of the roll 28, the longitudinal seam of the bag is closed further and finished. To this endthe bag is pushed toward the roll 28 by an edge 31 of a discharge container 20, or by a thrust roll (not shown). The thus finished bags are discharged from the clamping means 19 at the right mo- Fig. 3 shows diagrammatically the successive treatments of the material in a plan view, for the manufacture of a flat bag having a hem in the edge of the opening and in the bottom edge, said hems being folded to the inside of the bag, the hem in the edge of the opening being sealed to both walls of the finished bag and the hem at its bottom edge being. sealed onto one side wall only of the finished bag. At 4":1 a continuous strip of glue is applied onto the upper edge ofthe material in its movement; this edge will eventually form the edge of the opening of the manufactured bag. The significance of the other reference numerals is the same as in Fig. 2.

Fig. 4 shows diagrammatically the same treatments as Fig. 3 of the material in a side elevation.

Still other combinations and modifications are possible Within the scope of the present invention.

What I claim is:

1. In a machine for making bag bodies, the combination of a support for starting material, such as a web,

ment, for instance by mechanically opening these clamping means by stationary sliding discs (not shown), after which the bags are deposited in the container 20.

For the manufacture of bags with a hem not sealed to the adjacent material at the bottom or opening edge, the pasting roll, 4b or 46: or both are omitted. If the hem at the bottom is sealed only at one side of the bag to its wall, so as to obtain a bag with a greater depth, the pasting roll 4b has to apply a discontinuous glue strip to the edge of the material and should therefore be suitably designed, for instance as indicated in Fig. 1; if the bottom hem is to be sealed to both walls of the bag the circular cross-section of the pasting roll 4b should be uninterrupted. If it is desired to manufacture bags without a hem at the bottom and/or at the opening, the

pasting rolls 4b and/or 4:: and the folding means 24 or part of the folding means 24 may be omitted.

For the manufacture of fiat bags with a flap at its opening, the rolls 7 or 9 or 10 may be designed as cutting rolls for cutting the required fragments out of the edge of the material, for instance by making an undulating cut into the material, in which case the parts of the sheets of the material with the undulation at its edge form the wall of the bag with the fiap, whereas the adjoining parts form the opposite Wall of the finished fiat bag. r

Fig. 2 shows diagrammatically the successive treatments of the material in plan view, for the manufacture of bags with a flap at'the top and a hem at the bottom, said hem being folded to the inside of'the bag and being sealed to one side wall of the bag. In Fig. 2 as well as in Figs. 3 and 4 the material is passed from the left to the right side through the machine. At 7 longitudinal incisions are cut into the upper edge of the material; at 9' the shape of the flap is completed by half elliptical cuts in the edge of the material. At 4!) a discontinuous strip of glue is applied to the opposite edge of thematerial by means of' the pasting roll. 4b shown in Fig. 1 for sealing the bottom hem to one side wall of the finished fiat bag. At 6 the strip of glue is applied by the pastmg roll for sealing the bottom. At 1112 the web of material is cut, transversely to its movement, to sheets of the required length. fold of the bag is formed. At the strip of glue is applied for the longitudinal seam of the bag. At 18'-19 the not yet closed longitudinal seam of. the flat. bag, be-

ing for the rest finished and having a flap at the top,

is shown; at'32 the bag is shown with a closed and sealed longitudinal seam.

At 15'--17 the longitudinal strips and sheets of paper, regenerated cellulose, cellulose acetate and the like foldable material, pasters arranged to apply paste at least to one lateral edge of the material in the direction of its movement, and a transverse folder which: doubles the material upon a transverse line at a distance substantially of the breadth of the bag to be made, from theforemost transverse edge of the material, said transverse folder comprising a first roll and a companion second roll, said first roll having clamping means cooperating with a folding blade of said second roll, and folding the material passed with its foremost transverse edge in advance between both rolls, over said transverse line and entraining the material for at'l'e'ast lial'fa revolution of the first roll, the second roll having pasting means applying a transverse strip of paste to the material near the said foremost transverse edge of the material, said first and second roll being positioned so' that the first passing portion of the material is free from contact with said first roll, a third roll acting as companion roll of said first roll, said third roll having clamping means cooperating with a folding blade of said first roll and folding the strip with said'foremost edge over and to thematerial doubled by the action of said first and second rolls, and means for pressing and sealing the last mentioned strip to said doubled material.

2. In a machine for making bags with a closing rim atthe top, the combination according to claim 1, comprising'means arranged before the said transverse folder,

for folding a' pleat, flattened down in the direction of the bottom of the'bag to be made, in the direction of the r its-movement; said strip being sealed to the material only at'the longitudinal edgesofthe hagto be made.

4. In a machine for making flat bags with an inwardly folded hem at the bottom, the combination of a support for'the'starting material, such as a web, strips and sheets of paper, regenerated cellulose, cellulose acetate and the like foldable material, an edge folder blade turning a lateral edge of the-material in-and 'down upon the body of the material, pasters coating the face of the inturned flange with paste, a cutter severing thematerial transversely to the-length'oftwice the breadth of the bag to be made with the breadth of its longitudinal seam, and a transverse folder doubling the material upon a transverse line at a distance of substantially the breadth of the bag to bemade from the foremosttrans'verse edge of the material and with the inturned edge between both thus obtained. portions of the. material, said transverse folder comprising a first roll and a companion second roll, said first roll having clamping means cooperating with a folding blade of said second roll, and' folding the material passed with its foremost'transverse edge in advance between both rolls; over'saidtransver'se line andentraining the material for at least half a revolution of the first roll, the second roll having moreover pasting means applying a transverse strip of paste to the material near the said foremost edge of the material, said first and second roll being positioned so that the first passing portion of the material is free from contact with said first roll, a third roll acting as companion roll of the first roll, said third roll having clamping means cooperating with a folding blade of said first roll and folding the strip with .the said foremost edge over and to the material doubled by theaction of the first and second roll, and means for pressing and sealing the last mentioned strip to said doubled material.

5. In a machine for making flat bags with an inwardly folded hem at the bottom, the combination according to claim 4, comprising pasters arranged before said edge folder blade and applying paste at corresponding intervals of substantially the breadth of the flat bag to be made at said edge of the material in the direction of its movement, the folding and cutting means in combination being in such cooperation that flat bags with an inwardly folded hem sealed to only one of its walls at its bottom are obtained.

6. In a machine for making fiat bags with an outwardly folded hem at the bottom, the combination of a support for the starting material, such as a web, strips and sheets of paper, regenerated cellulose, cellulose acetate and the like foldable material, an edge folder blade turning, a lateral edge of the material in and down upon the body of the material, pasters coating the edge of the thus folded material opposite the side of the inturned flange with paste, a cutter severing the material transversely to the length of twice the breadth of the bag to be made with the breadth of its longitudinal seam, and a transverse folder doubling the material upon a transverse line at a distance of substantially thebreadth of the bag to be made from the foremost transverse edge of the material and with the inturned edge outside both thus obtained portions of the material, said transverse folder comprising a first roll and a companion second roll, said first roll having clamping means cooperating with a folding blade of said second roll, and folding the material passed with its foremost transverse edge in advance between both rolls, over said transverse line and entraining the material.

for at least half a revolution of the first roll, said second roll having pasting means applying a transverse strip of paste to the material near the said foremost edge of the material, said first and second rolls being positioned so that the first passing portion of the material is free from contact with said first roll, a third roll acting as companion roll of said first roll, said third roll having clamping means cooperating with a folding blade of said first roll and folding the strip with the said foremost edge over and to the material doubled by the action of the first and second rolls, and means for pressing and sealing the last mentioned strip to said doubled material.

7. In a machine for making flat bags with an inwardly folded hem at the opening edge, the combination of a support for the starting material, such as a web, strips and sheets of paper, regenerated cellulose, cellulose acetate and the like foldable material, an edge folder blade turning a lateral edge of the material in and down upon the body of the material, pasters applying paste to the material near the opposite lateral edge, in the direction of movement of the material, a cutter severing the material transversely to the length of twice the breadth of the bag to be made with the breadth of its longitudinal seam, and a transverse folder doubling the material upon a transverse line at a distance of substantially the breadth of the bag to be made from the foremost transverse edge of the material and with the inturned edge between the thus doubled material, said transverse folder comprising a first roll and a companion second roll, said first roll having clamping means cooperating with a folding blade of said second roll and folding the material passed with its foremost transverse edge in advance between said rolls, over said transverse line and entraining" the material for at least half a revolution of said first roll, said second roll having moreover pasting means applying a transverse strip of paste to the material near the said foremost transverse edge of the material, said first and second rolls being positioned so that the first passing portion of the material is free from contact with said first roll, a third roll acting as a companion roll of said first roll, said third roll having clamping means cooperating with a folding blade of said first roll and folding the strip with the said foremost edge over and to the material doubled by the action of the first and second rolls, and means for pressing and sealing the last mentioned strip to said doubled material.

8. In a machine for making fiat bags with an outwardly folded hem at the opening edge, the combination of a support for the starting material, such as a web, strips and sheets of paper, regenerated cellulose, cellulose acetate and the like foldable material, an edge folder blade turning a lateral edge of the material in and down upon the body of the material, pasters applying paste to the material near the opposite lateral edge in the direction of movement of the material, a cutter severing the material transversely to the length of two times the breadth of the bag to be made with the breadth of its longitudinal seam, and a transverse folder doubling the material upon a transverse line at a distance of substantially the breadth of the bag to be made from the foremost transverse edge of the material and with the inturned edge outside the thus doubled material, said transverse folder comprising a first roll and a companion second roll, said first roll having clamping means cooperating with a folding blade of said second roll and folding the material passed with its foremost transverse edge in advance between said rolls, over said transverse line and entraining the material for at least half a revolution of said first roll, said second roll having moreover pasting means applying a transverse strip of paste to the material near the said foremost transverse edge of the material, said first and second rolls being positioned so that the first passing portion of the material is free from contact with said first roll, a third roll acting as a companion roll of said first roll, said third roll having clamping means cooperating with a folding blade of said first roll and folding the strip with the said foremost edge over and to the material doubled by the action of the first and second rolls, and means for pressing and sealing the last mentioned strip to said doubled material.

9. In a machine for making fiat bags with an inwardly folded hem at the opening edge, the combination ac cording to claim 7 comprising pasters arranged before said edge folder blade, said pasters applying paste near the edge to be turned in.

10. In a machine for making flat bags with an inwardly folded hem at the opening edge, the combination according to claim 9 comprising means for applying a string into the hem.

11. In a machine for making flat bags with an in wardly folded hem at the bottom, the combination ac cording to claim 4 comprising cutting means arranged before the transverse folder whereby flaps are cut into the other lateral edge in the movement of the material.

12. in a machine for making flat bags with an out- Wardly folded hem at the bottom, the combination according to claim 6 comprising cutting means arranged before the transverse folder whereby flaps are cut into the other lateral edge in the movement of the material.

13. In a machine for making fiat bags with an outwardly folded hem at the opening edge, the combination according to claim 8 comprising pasters arranged before said edge folder blade, said pasters applying paste near the edge to be turned in.

(References on following page) Crowell; Apr. 8-, 1313 Crowell Oct. 14, 1873- Stocking May 24, 18-81- Sawyer Sept. 22, 1885 West Dec. 1 6, 1890 'Munson July 19, 1932 Klingen Ian. 23, 1934: 10

Haskell- Sept. 27, 1935 8 Gceflings. Feb. 23,. 1 93:7 Brellzetal Aug..13, 1940 Schmidt Feb. 20,1945 Watensi July 6, 1948'- Winesett May 10, 1949 FOREIGN PATENTS Switzerland May 1, 1931 Germany May 2, 1924 Germany Jan. 9, 1940

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