Патент USA US2129842код для вставки
Sept. 13, 1938. c. HOLWEG 2,129,842 PROCESS AND APPARATUS FOR THE PRODUCTION OFYFLAT BAGS Filed May 17, 1935 ' . I 2 Sheets-Sheet l I I fnvenfan ' “6M W ' ‘ Sept. 13, 1938.. I‘ _c. HOLWEG 2,129,842 PROCESS AND APPARATUS FOR THE PRODUCTION OF FLAT‘ BAGS ' Filed May 17, 1935 ‘ 2 Sheets-Sheet 2 // @ Q Patented Sept. 13, 1938 ‘ 2,129,842 ‘UNITED STATES PATENT OFFICE 2,129,842 PROCESS AND APPARATUS FOR THE PRO DUCTION 0F BAGS . Charles Holweg, .Strasbourg, France, assignor to Atelier-s de Constructions Mecanlques C. & A. Holweg, Strasbourg, France, a society of France Application May 17, 1935, Serial No. 21,952 In Germany June 26, 1934 11 Claims. (01. 93-18) The invention relates to a process for the pro ducing of ?at bags from a continuous paper web, which is formed into a tube and then cut ‘into sections, whereupon one end of the sections is turned over to form _a bottom ?ap. The tubular sections must be separated from each other in such a way that one end projects a little over the other, as otherwise a simple folding-in of one end of the tube is not sufficient for obtaining a 10 perfect closure of the bottom. . In'general therefore for separating the sections of the tube from the web the strike-off method is employed, which consists in striking off the upper and lower parts of the tube at the same 15 time along two scalloped lines by means of a striker which is moved transversely across the web. The striking-off, however, causes an un pleasant noise; while, when the struck-off tube sections are carried along, interruptions are often 20 caused by the arriving bags being jammed up or crumpled. The strikers are moreover very dangerous for the machine tenders. To avoid the di?iculties in the separation of the tube pieces by a striker, it has already been 25 proposed to produce in the continuous paper web from which the bags are made, either before or after the formation of the tube, lines of perfora tion de?ning the closure flaps which are subse quently to form the bag ends. The ?nal separa 30 tion of the foremost sections of the tube is then effected by a traction effort exerted thereon by suitable means, for example rollers having a higher peripheral speed than that of movement of the tube. However, the separation is effected 35 already well before the tube sections are engaged by the bag-end forming device, so that these sections are obliged to travel for a certain dis tance as, individual pieces which are in some cases subjected to further operations and are in 40 all cases exposed to the same risks of tangling, jamming and crumpling as the sections sepa rated by striking. In the process according to the invention, all these risks are avoided by the fact that the tear 45 ing or detaching of the foremost tube sections is effected by the bag-bottom forming device com prising in known manner rotative tongs cooper— ating with a synchronically turning folding blade. 50 ‘ This process makes it possible to ensure that the web need not be or is not separated into sec tions before the bottom is formed or in process of forming, which not only brings about greater continuity in the working process, but at the 65 same time a considerablev simplification and standardization of the driving arrangements and, moreover, permits stoppages and interruptions of work ‘and in this way results in an increased output capacity of the machine. Finally, the bottom ?aps may also be-given any desired shapes 1.1 and may be on the same tube side as the ‘upper closing ?ap, which also was not possible by the known striking-off method. The drawings show in diagrammatic form various arrangements for the realization of the invention, viz.:— ) > Figs. 1-3 an arrangement in which the per foration is effected after the formation of the tube; Fig. 1 shows the tube in different stages of the separating-off operation and Fig. 3 shows a 15 tongue which is joined on to the tube-forming mandrel, which tongue acts as a support for the tube during the separation. ’ Figs. 4-6 show in side elevation and plan an ‘ arrangement in which the perforation is carried out before the formation of the tube. Figs. 7-10 show an arrangement as well as various working phases for the production of bags, in which the bottom flap is on the same tube side as the upper closing ?ap. According to Figs. 1-3 the formation‘ of the tube takes place at I in the usual manner; this is drawn over the mandrel 2 shaped as a thin tongue by means of drawing roller pairs 2’, which are carried‘ in two lateral recesses in the man 36 drel. Behind these drawing rollers the mandrel is at 3 hollowed out like a comb, and two rollers 4 are arranged at this place one above and one be low the mandrel and these rollers are provided with a perforating device 5, the points of which pass into the teeth in the comb without touching one another. The perforating devices can be shaped in any desired manner. It is preferable that they should make a straight line for one side of the tube and a curved line for the other. The tube thus prepared leaves the mandrel and by means of a further pair of drawing rollers 6 having the same peripheral speed as 2' it is car ried to the folding apparatus ‘I of a construction already known per se. As the peripheral. speed of the latter is greater than the travelling speed of the arriving already perforated tube, the fore most of the already ‘perforated tube sections can be separated off without dimculty at the perfo rated places; - Owing to the fact that the separating-off of the tube section takes place only after the section has already been gripped by the folding appara tus, a. special conveying device, such as was pre viously indispensable for the separated-off tube 55 2 2,129,842 sections, can be dispensed with. The drawing With the known ?at bags there is the disad roller pair 6 canalso be moved much further vantage that the strip serving for the bottom back, so that their positionis behind the ?rst flap and that for the closing ?ap lie at both ends perforated position of the already perforated ‘of the tube of the bag upon opposite sides, i. e., tube. Their distance from the folding apparatus the bottom ?ap is turned up on one side of the 1 can moreover be varied within wide limits in tube, while the closing flap is turned up on the order to make allowance for the different lengths other side of the tube. The cause of this is of bag. ‘ _ due to the dependence of both strips upon each The closing of the bottom of the bag can be other (the strips are formed, as is known, by a 10 effected in the usual manner by the folding in two different planes) which explains moreover In the example of embodiment shown in Figs. 4-6 the perforation of the web I is effected before why both ?aps must always have the same shape v the tube is formed. l5 ‘ simultaneous separation of both sides of the tube 10 apparatus. Owing to this, in the ?rst place a further simpli?cation of the machine is effected, as only one perforating roller is required, and also the ?at mandrel, on which both sides of ' the tube were otherwise perforated and which and length. The demand now, however, exists in practice, partly on aesthetic grounds and part ly on practical grounds, to turn up both flaps 15 towards the same side ‘of the bag, and to give them in addition different shapes and different lengths. - ‘ ‘ owing to the friction of the driving rollers is ex 20 posed to a considerable amount of wear, is dis This is attained, in accordance with the pres ent invention, by giving a special shape to the 20 pensed with. The shaping plate which forms‘ lines of perforation between the sections of the the tube can also be made adjustable in width web. These lines are in the present case shaped in the known manner. ’ . As'can be seen, the paper web after being un 25 wound in the known manner is provided by the pasting wheel II with a longitudinal coating of paste, ‘a roller l2 taking up-the counter-pressure. This roller can either be covered with rubber, or it may have a slit corresponding to the perforat 30 ing device. Opposite to it a shaft I3 is mounted, which carries a perforating device M, the rota tion of which corresponds to the unfolded length of the bag and which works with one revolution per bag. The shape and the size of the perforat ing device is made to correspond to the require ments of the bottom pasting, as well as to the shape of the desired opening ?ap. The perforat ing device can be conveniently composed, accord 40 in such a way, that they surround two flaps which can but ought not necessarily abut against one another, namely the closing flap of one section 25 and the bottom flap of the next section, and the separation is effected in two stages after the formation of the tube, a ?rst stage in which the foremost tube part before its entry into the fold ing apparatus is separated from the next tube, 30 and a second phase, in which the waste which is formed between the two ?aps is removed. The manner of both separations is that the forward end'of the part of the tube to be separated is seized on each occasion by members, whose speed 35 of travel is greater than‘ the speed of those mem bers which are holding or retaining the part be hind the perforation. ing to requirements, of straight and curved ele In the embodiment of Figs. 7-10 there are two ments, like typographical printing matter. These lines 9, 9', of which the first forms the edge of 40 the closing flap of the preceding section of the web, and the latter forms the edge of the bottom flap of the next section of the web. By using two lines of perforation the possibility is there fore presented of shaping the closing and bottom 45 flaps quite independently of each other and in elements may be pieces of an ordinary band saw. The means for holding these elements may also be variable in length and thickness and exchange able. The tube is then s'haped in the known manner 45 around a forming plate, which may be rigid or adjustable in its width and drawn along by the drawing device 6. This drawing device is ad - justably mounted in the longitudinal direction, with a view to permitting never more than one line of perforations 9 between the drawing device 6 and the folding apparatus 1. The drive of this drawing device is effected by means of inter mediate wheel l6~through the shaft I5 of the 55 folding apparatus, upon which a change speed wheel "is fastened. [ At the given moment the folding blade l8 can in the known manner seize hold of the projecting end of the tube which is to form the bottom and 60 owing to its greater speed in relation to the draw , ing device 6 it can ?nally separate the tube along the line of perforations 9. For relieving the folding knife a ?llet Ill can be arranged near by it, which by pressing on the lower folding roller 65 seizes the necessarily projecting bottom end and gives to this part of the tube in a positive manner the acceleration necessary for separation. The folding then takes place without the folding blade taking part in the separating operation and the blade therefore does <not suffer from additional straining. , \ ' ‘ Figs. 'I-lOshow an arrangement for the pro duction of ?at bags with a lower bottom flap and upper closing ?ap situated on one side of the tube. any desired manner. The perforating blade I4 is given the suitable shape. Before perforation the web I receives as usual a longitudinal coating of paste by means of the glue coating device H. The tube is shaped in the known manner over a forming plate, while the pair of drawing roll ers 6 supply the necessary tension effect. Following on the formation of the ‘tube the separation takes place in two stages. In addi 55 tion to the folding apparatus 1 there is also ar ranged here a special pair of separating rollers 20, 2| placed in front of the folding device. One roller of this pair has‘ a recess over the larger part of its circumference and it therefore only 60 comes into periodical contact with its counter roller, in order to exert a drawing effect upon the tube. The peripheral speed of the rollers 20, 2| is greater than that of the drawing rollers 6. The peripheral speed of the folding appa 65 ratus ‘I is likewise greater than that of the pair of rollers 20, 2|. When the track has passed a little way over the contact line W, W’ of the two rollers 20, 2|, these two "latter come into engagement with one 70 another; the seized tube part receives the in creased peripheral speed of these rollers and a complete separation of the same from the suc ceeding tube takes place in accordance with the shape of the bottom ?ap of the next part of the 75 2,129,842 tube (Figs. ‘8b and 9). The separated tube part is now carried along further at increased speed by the pair of rollers 20 and 2| and it travels away from the more slowly moving tube. After a certain interval of time, which is dependent upon the length of the bottom closing flap, its forward end is seized by the folding apparatus 1, while‘ at the same time the lower recessed edge of its rear end is released by the rollers 20, 2| and only the upper paper layer of this end is still held by the rollers. The greater peripheral speed of the folding apparatus then effects the separation of the waste 23 produced between two tube parts in accordance with the 3 at a higher circumferential speed than the draw~ ing rolls, and a ?llet on said bottom-forming means for gripping a tube section and advancing it at a higher linear speed than the remainder of the tube. 5. An apparatus for manufacturing paper bags from a continuously moving paper web compris ing a device for transversely perforating the web, a tube forming device, drawing rolls for the tube, and a rotative bottom-forming device turning at 10 a higher circumferential speed than the draw ing rolls effective to grip the fore end of a tube section to tear it away from the remainder of the . tube. 6. An apparatus for manufacturing paper bags shape of the closing ?ap of the part of the tube seized (Fig. 8C and Fig. 10); The waste 23 is from a continuously moving paper web compris ing a device for transversely perforating the web, ' lifted through a series of points “on to the roll er 2| and carried downwards where it is stripped, a tube forming device, drawing rolls for the tube, off by a rake 25 and stored up in a container 26. “ a rotative bottom forming device turning at a 20 though it would be more cumbersome and ex higher circumferential speed than the drawing 20 rolls and a. ?llet ,on' said bottom-forming device for gripping the *‘fore end of a tube section to tear pensive to do so. it way from the remainder of the tube. However the waste can also be removed by two or more rollers instead of by this one roller, al- ~ 1 ' In orderto be able to make allowance for various lengths of bag and ?ap, the drawing rollers 6, the separating rollers 2|], 2| and the folding apparatus 1 are so arranged that the distances between the same can be varied. _ As shown in Figs. 1 and 8C, the bag bottom is 30 formed by folding the cut-out end about a line arranged inwardly of the cut-out portion, thus presenting a double thickness of the tube to the folding mechanism, thereby preventing injury to the tube and producing a bag having a stronger than usual bottom structure. The further working-up of the bag is carried out in the known manner. I claim: ‘ 1. An apparatus for manufacturing paper bags 40 from a continuously moving paper web compris ing a device for transversely perforating the web, a tube-forming device, drawing rolls for the tube, and rotative bottom-forming means operating at higher peripheral speed than said drawing 45 rolls effective to separate a tube section by ad vancing it at a higher linear speed than the re .mainder of the tube. 2. An apparatus for manufacturing paper bags from a continuously moving paper web compris '50 ing a device for transversely perforating the web, a tube-forming device, drawing rolls for the tube, rotative bottom-forming means operated at a higher circumferential speed than the drawing rolls and? a fillet on said bottom-forming means for gripping a tube section and advancing it at a higher linear speed than the remainder of the tube. 3. An apparatus for manufacturing paper bags - from a continuously moving paper web compris 60 ing 'a rotating member, perforating means car ried thereby, a co-operating roller having a re silient surface engageable by said perforating means, ‘a tubevforming device, drawing rolls for the tube, and rotative bottom-forming means op 65 erating at higher circumferential speed than said drawing rolls effective to separate a tube section by advancing it at higher linear speed than the remainder of the tube. 4. An apparatus for manufacturing paper bags from a continuously moving paper web compris ing a rotating member, perforating means car 7. An apparatus for manufacturing paper bags from a continuously moving paper web compris-v 25 ing a tube forming mandrel, a comb-like per forated prolongation and lateral drawing rollers on said mandrel, perforating rollers above and beneath the comb perforations of the prolonga tion, drawing rolls following the perforating roll 30 ers and a rotative bottom forming device turning at a higher circumferential speed than the draw ing rolls. 8. An apparatus for manufacturing paper bags from a continuously moving paper web compris 35 ing a device for transversely perforating the web, perforating blades on the perforating device sur rounding a bottom flap of one tube section and an upper closing flap of the preceding tube section, a tube-forming device, drawing rolls for the tube, 40 periodically acting tearing rolls the circumferen tial speed of which is higher than that of the drawing rolls and a rotative bottom-forming de vice the circumferential speed of which is higher than that of the periodically acting tearing rolls. 45 9. In the process of manufacturing paper bags with flat bottoms .wherein a paper tube having longitudinally spaced transverse perforations dividing the same into sections of uniform length is continuously advanced at a uniform rate, the 50 steps of folding corresponding ends of successive sections to form bag bottoms and simultaneously increasing the rate of advance movement of the section being subjected to the bottom-forming operation to separate it from the tube. . 55 10. In a process for manufacturing paper bags with flat bottoms wherein a web of paper is con tinuously advanced at a uniform rate and formed into a tube, the steps of perforating the paper web to divide it into sections of uniform length, fold ing said perforated web into a tube, folding cor responding ends of successive sections to form bag bottoms and simultaneously increasing the rate of advance movement of the section being subjected to the bottom-forming operation to separate it from the tube. 11. In a process for manufacturing paper bags with ?at bottoms and upper closing flaps turned on the-same side as the bottom wherein a web of 70 paper is continuously advanced at a uniform rate silient surface engageable by said perforating and formed into a tube, the steps of transversely perforating the web to divide the tube into sec means, a tube-forming device, drawingrolls for the tube, rotative bottom-forming means turning tions of uniform length, said perforations being along lines of which one is shaped like the edge of 75 ried thereby, a co-operating roller having a re 4 2,129,842 the closing ?ap of the leading tube section and the second is shaped like the edge of the bottom ?ap of the succeeding tube section, increasing the rate of advance movement; of the leading section to separate it from the tube along the second line of perforation, folding the leading end of the section to form the bag bottom and simultaneously in creasing the rate of advance movement of that portion of the section ahead of said ?rst line of perforations, thereby separating said portion from the remainder. CHARLES HOLWEG.