EP0634352B1 - Method and means for folding paper handkerchiefs or the like - Google Patents

Method and means for folding paper handkerchiefs or the like Download PDF

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Publication number
EP0634352B1
EP0634352B1 EP94830349A EP94830349A EP0634352B1 EP 0634352 B1 EP0634352 B1 EP 0634352B1 EP 94830349 A EP94830349 A EP 94830349A EP 94830349 A EP94830349 A EP 94830349A EP 0634352 B1 EP0634352 B1 EP 0634352B1
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EP
European Patent Office
Prior art keywords
rollers
cylinder
folding
holes
machine
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EP94830349A
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German (de)
French (fr)
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EP0634352A1 (en
Inventor
Renzo Tommasi
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Rent SRL
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Rent SRL
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H29/00—Delivering or advancing articles from machines; Advancing articles to or into piles
    • B65H29/24—Delivering or advancing articles from machines; Advancing articles to or into piles by air blast or suction apparatus
    • B65H29/241—Suction devices
    • B65H29/243—Suction rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31D—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER, NOT PROVIDED FOR IN SUBCLASSES B31B OR B31C
    • B31D1/00—Multiple-step processes for making flat articles ; Making flat articles
    • B31D1/04—Multiple-step processes for making flat articles ; Making flat articles the articles being napkins, handkerchiefs, towels, doilies, or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H45/00—Folding thin material
    • B65H45/12—Folding articles or webs with application of pressure to define or form crease lines
    • B65H45/16—Rotary folders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H45/00—Folding thin material
    • B65H45/12—Folding articles or webs with application of pressure to define or form crease lines
    • B65H45/28—Folding in combination with cutting

Definitions

  • the present invention relates to a method and a tissue paper folding machine, towels and the like.
  • machines for folding tissues include: a group of unwinding of a continuous strip of sampled paper from a reel; an embossing group for print relief decorations on paper; a cutting group to form several strips or "working channels” from the main strip powered from the coil; ways to longitudinal folding of the different strips in continued; a transverse cutting group or “slicing" of the strips thus folded to form individual handkerchiefs, with a pair of cylinders, one says “cutting” and the other says “of maintenance "of the product, on the surfaces of which adhere to the strip segments that have been cut, thanks to a suction action carried out on them, from inside the rollers, by means of a plurality of communicating surface holes with corresponding internal chambers air suction; a third cylinder, called “folding cylinder", with the active surface with several communicating through holes with corresponding internal chambers suction to retain the product during processing, which is contiguous to the cylinder of holding and intended to take the segments from paper from the latter, after activation a corresponding group of valves
  • German patents DE 3439211A1, DE 3243778A1 and DE 3241869A1 describe as many devices for folding paper tissues and the like in machines based on the operating methodology mentioned above and which relate, more particularly, to the suction system of the air in the different folding cylinders. Substantially, they are hollow cylinders, with the active surface pierced at several points so as to be communicating with an internal suction chamber and from which the air is sucked through one or both of its ends. But this results in a non-uniform distribution of the pressure lines along the axial direction of the cylinders, mainly due to the pressure losses due to the large length of the cylinders themselves, so that the suction efficiency turns out gradually decreasing from the ends towards the center of the cylinders.
  • the main object of the present invention is to eliminate the aforementioned drawbacks. This result has been achieved, in accordance with the invention, by adopting a method for folding handkerchiefs and the like, according to claim 1. And as regards the machine for carrying out said method, it comprises the characteristics according to claim 2. Other features are provided in claims 3 to 6.
  • the advantages obtained thanks to the present invention basically consist of what is possible ensure uniform and efficient suction of the air along the entire length of the axis of each machine cylinder even with low differential pressure values between the inside and outside of the cylinders, without resort to no excess suction and reduce thus strongly energy consumption corresponding and the manufacturing cost of handkerchiefs; that the rollers and cylinders of paper processing of the type described above are simple, economical and reliable to manufacture, even after an extended period of service; that it is possible to improve the quality of the finished product by effect of more correct and effective restraint of paper segments on the active surface of cylinders thanks to the uniformity of the depression in each area of the cylinder surface; that he is possible to manufacture machines from any what width allowed, with a large number of working channels, without using any surplus and ensuring on every occasion the proper functioning of the machines themselves and the good paper retention on the active surfaces of aforementioned cylinders and rollers, and thereby increase production as required by the market.
  • FIG. 1 schematically represents the side view of a machine according to the invention
  • Fig. 2 shows the plan view of the machine of FIG. 1
  • Fig. 3 represents the front view of the group of the cylinders of the machine of FIG. 1
  • Fig. 4 represents the right side view of the group of the Fig. 3
  • Fig. 5 shows the plan view of the group of FIG. 3
  • Fig. 6 shows the view in detailed longitudinal section of a segment of the machine folding cylinder of fig. 1;
  • Fig. 1 schematically represents the side view of a machine according to the invention
  • Fig. 2 shows the plan view of the machine of FIG. 1
  • Fig. 3 represents the front view of the group of the cylinders of the machine of FIG. 1
  • Fig. 4 represents the right side view of the group of the Fig. 3
  • Fig. 5 shows the plan view of the group of FIG. 3
  • Fig. 6 shows the view in detailed longitudinal section of a segment of the machine folding cylinder of fig. 1
  • FIG. 7 shows the sectional view along line A-A of the detailed view of FIG. 6;
  • Fig. 8 represents the detailed longitudinal section view of a portion of the cutting cylinder of the machine of FIG. 1, with the bedrooms suction width equal to two channels of job;
  • Fig. 9 shows the sectional view along line C-C of the detailed view of the Fig. 8;
  • Fig. 10 shows the sectional view along line B-B of the detailed view of the Fig. 8;
  • Fig. 11 shows the sectional view longitudinal of a cylinder like that of FIG. 8, but with width suction chambers equal to a working channel.
  • the machine includes a plurality cylinders and rollers for cutting and transverse folding of the paper, each of which with its respective active surface provided with several groups of through holes which communicate with corresponding internal suction chambers air.
  • the folding cylinder (2) of the machine consists of a plurality of coaxial cylindrical segments (20) connected in unidirectional cascade with interposition of a fixed valve (21) between each pair of segments (20 ) contiguous, which is connected to a source (AS) of air suction, so as to delimit a corresponding main suction chamber (28).
  • each segment (20) of the cylinder (2) is appropriately grooved longitudinally and in correspondence with each groove is fixed a rectangular plate (23) with several holes (24) through, so as to define a plurality of chambers (22) which communicate with said chamber (28) by means of several radial through holes (29), in programmed succession controlled by the valve (21) with the rotation of the cylinder (2) .
  • Each segment (20) of the cylinder (2) is mounted on a corresponding support (25) wedged on a horizontal shaft (26).
  • Each valve (21) is connected to the support '(25) of the respective segment (20) by means of two bearings (27). The rotation of the shaft (26) causes the corresponding rotation of the segments (20) of the cylinder (2) relative to the air suction valves (21).
  • each segment (20) are in communication with the corresponding chamber (28) in the desired sequence, via the radial holes (29).
  • each group of holes (24) is slaved to the desired sequential suction, so as to allow the retention and respectively the programmed release of the paper on the active surface of the corresponding cylindrical segment (20).
  • the cutting cylinder (3) is made in one piece, with the active surface provided with several longitudinal grooves, each of which has a length equal to the width of two working channels and with a rectangular plate (34) corresponding provided with several through holes (35), so as to delimit as many chambers (33), each of which communicates through an opening (36) with a fixed valve (32) arranged in correspondence of its center line and connected to the air suction installation (AS): said valve (32) being coaxial with the cylinder (3) and supported by the latter.
  • each of said longitudinal grooves has a length equal to the width of a working channel. This further increases the uniformity of the suction flow and thus the efficiency of the machine.
  • the auxiliary rollers (4) their manufacture is identical to that described above for the cutting cylinder (3). More particularly, the auxiliary rollers (4) have the active surface provided with several internal suction chambers, which have a length equal to the width of one or two working channels and are connected to corresponding valves controlled by an installation of air suction (AS): said suction chambers being delimited by as many longitudinal grooves made on the active surface of the rollers and covered by corresponding plates provided with several through holes so as to achieve direct pneumatic communication between the suction chambers and the active surface of the rollers (4).
  • AS air suction
  • the subdivision of the cylinder (2) into several segments (20), each of which provided with a main suction chamber (28) of reduced length to exert the action of retaining the paper on the active surface, makes it possible to obtain a uniform and correct distribution of pressure lines over the entire length of the cylinder axis (2). This makes it possible to make the treatment carried out by means of the folding cylinder (2) more efficient, and consequently to improve the quality of the finished product. Furthermore, this makes it possible to drastically reduce the pressure losses associated with the action of suction of the air inside the cylinder (2). What has been said applies analogously to the cylinder (3) and to the rollers (4) as regards the subdivision of the suction action between the different suction chambers (33) distributed along their axes.

Abstract

Machine for folding paper handkerchiefs (tissues), napkins (towels, serviettes) and the like according to the method of Claim 1, comprising a plurality of cylinders and rollers for cutting and transverse folding of the paper, in which the folder cylinder (2) consists of a plurality of coaxial cylindrical segments (20) connected in cascade with the interposition of a fixed valve (21) between each pair of segments (20), which is connected to an air-suction source (AS) so as to delimit a corresponding main suction chamber (28), in which the outer surface, that is to say the active surface, of each segment (20) of the said cylinder (2) is channelled longitudinally and, in correspondence with each channel, there is fastened a rectangular plate (23) with several through holes (24), so as to delimit a plurality of chambers (22) which communicate with the said chamber (28) by means of several radial through holes (29), in a sequence which is programmed under the control of the valve (21) with the rotation of the cylinder (2). <IMAGE>

Description

La présente invention concerne un procédé et une machine pour le pliage de mouchoirs en papier, serviettes et similaires.The present invention relates to a method and a tissue paper folding machine, towels and the like.

Il est connu que les machines pour le pliage des mouchoirs en papier comprennent: un groupe de déroulement d'une bande continue de papier prélevée à partir d'une bobine; un groupe de gaufrage pour imprimer des décorations en relief sur le papier; un groupe de coupe pour former plusieurs bandes ou "canaux de travail" à partir de la bande principale alimentée à partir de la bobine; des moyens de pliage longitudinal des différentes bandes en continu; un groupe de découpage transversal ou "tranchage" des bandes ainsi pliées pour former des mouchoirs individuels, avec une paire de cylindres, l'un dit "de découpage" et l'autre dit "de maintien" du produit, sur les surfaces desquels adhèrent les segments de bandes qui ont été découpés, grâce à une action d'aspiration effectuée sur ceux-ci, de l'intérieur des rouleaux, au moyen d'une pluralité de trous superficiels communicants avec des chambres internes correspondantes d'aspiration de l'air; un troisième cylindre, appelé "cylindre plieur", avec la surface active munie de plusieurs trous traversants communicants avec des chambres internes correspondantes d'aspiration pour retenir le produit en cours de traitement, lequel est contigu au cylindre de maintien et destiné à prélever les segments de papier provenant de ce dernier, après activation d'un groupe correspondant de vannes destinées à la commande de l'aspiration; plusieurs autres rouleaux, adjacents au cylindre plieur, eux aussi avec la surface active perforée de manière appropriée, et équipés d'un système d'aspiration de l'air à partir de l'intérieur, par la suite appelés "rouleaux auxiliaires", lesquels sont destinés à décoller le bord antérieur des différents mouchoirs en cours de pliage. Il est également connu que le papier à découper et plier est alimenté du haut vers le bas et que la longueur des rouleaux et cylindres précités est environ égale à la largeur de la bobine d'alimentation du papier.It is known that machines for folding tissues include: a group of unwinding of a continuous strip of sampled paper from a reel; an embossing group for print relief decorations on paper; a cutting group to form several strips or "working channels" from the main strip powered from the coil; ways to longitudinal folding of the different strips in continued; a transverse cutting group or "slicing" of the strips thus folded to form individual handkerchiefs, with a pair of cylinders, one says "cutting" and the other says "of maintenance "of the product, on the surfaces of which adhere to the strip segments that have been cut, thanks to a suction action carried out on them, from inside the rollers, by means of a plurality of communicating surface holes with corresponding internal chambers air suction; a third cylinder, called "folding cylinder", with the active surface with several communicating through holes with corresponding internal chambers suction to retain the product during processing, which is contiguous to the cylinder of holding and intended to take the segments from paper from the latter, after activation a corresponding group of valves intended for the suction control; several others rollers, adjacent to the folding cylinder, too with the active surface perforated so suitable, and equipped with a suction system the air from inside, eventually called "auxiliary rollers", which are intended for peel off the front edge of the different tissues being folded. It is also known that the paper to cut and fold is fed from the top down and that the length of the rollers and aforementioned cylinders is approximately equal to the width of the paper feed spool.

Les brevets allemands DE 3439211A1, DE 3243778A1 et DE 3241869A1 décrivent autant de dispositifs pour effectuer le pliage de mouchoirs en papier et similaires dans des machines basées sur la méthodologie opératoire mentionnée ci-dessus et qui concernent, plus particulièrement, le système d'aspiration de l'air dans les différents cylindres plieurs. Substantiellement, il s'agit de cylindres creux, avec la surface active percée en plusieurs points de manière à être communicante avec une chambre interne d'aspiration et de laquelle l'air est aspiré à travers une ou ses deux extrémités.
Mais ceci entraíne une distribution non uniforme des lignes de pression le long de la direction axiale des cylindres, principalement en raison des pertes de charge dues à la longueur importante des cylindres eux-mêmes, de sorte que le rendement de l'aspiration s'avère progressivement décroissant des extrémités vers le centre des cylindres.The German patents DE 3439211A1, DE 3243778A1 and DE 3241869A1 describe as many devices for folding paper tissues and the like in machines based on the operating methodology mentioned above and which relate, more particularly, to the suction system of the air in the different folding cylinders. Substantially, they are hollow cylinders, with the active surface pierced at several points so as to be communicating with an internal suction chamber and from which the air is sucked through one or both of its ends.
But this results in a non-uniform distribution of the pressure lines along the axial direction of the cylinders, mainly due to the pressure losses due to the large length of the cylinders themselves, so that the suction efficiency turns out gradually decreasing from the ends towards the center of the cylinders.

Pour remédier, partiellement, à ce grave inconvénient, il faut recourir à un surplus énergique d'aspiration, ce qui entraíne une consommation d'énergie spécifique supérieure, et par conséquent des coûts de production plus importants. Par ailleurs, pour maintenir les pertes de charge dans des limites toutefois tolérables, il est nécessaire de façonner de manière appropriée la surface interne des cylindres, c'est-à-dire leurs chambres d'aspiration, ce qui nécessite un usinage extrêmement soigné et précis de celles-ci et l'intervention de spécialistes hautement qualifiés. Tout ceci empêche de fait la fabrication de machines de grandes dimensions, c'est-à-dire avec des cylindres de grande longueur et adaptées pour de grandes productions conte cela est exigé par le marché et, en outre, cela entraíne l'augmentation de leur coût de fabrication. En plus de cela, le fait est que, étant nécessaire d'alimenter le papier du haut vers le bas, il n'est pas possible d'exploiter la force de gravité agissant sur les bords à plier des mouchoirs pour en faciliter le pliage. To partially remedy this serious downside, you have to resort to a surplus energetic aspiration, which results in a higher specific energy consumption, and consequently more production costs important. Furthermore, to maintain losses load within tolerable limits, it is necessary to appropriately shape the internal surface of the cylinders, i.e. their suction chambers, which requires machining extremely neat and precise of these and the intervention of highly qualified specialists. All this effectively prevents the manufacture of large machines, i.e. with long cylinders suitable for great storytelling productions this is required by the market and furthermore it increases of their manufacturing cost. In addition to that, the fact is that being necessary to power the paper from top to bottom, it is not possible to exploit the force of gravity acting on edges to fold handkerchiefs for easy folding.

Les documents EP-A-302031 et DE-A-2439780 décrivent des machines pour le façonnage du papier comprenant des rouleaux et cylindres de travail sur lesquels le papier est retenu au moyen d'une aspiration forcée à travers la surface externe des rouleaux et cylindres. Documents EP-A-302031 and DE-A-2439780 describe machines for shaping paper comprising rollers and working cylinders on which the paper is retained by suction forced through the outer surface of the rollers and cylinders.

Le but principal de la présente invention est d'éliminer les inconvénients précités.
Ce résultat a été atteint, conformément à l'invention, en adoptant un procédé pour le pliage de mouchoirs en papier et similaires, selon la revendication 1. Et pour ce qui concerne la machine pour mettre en oeuvre ledit procédé, elle comprend les caratéristiques selon la revendication 2. D'autres caractéristiques sont prevues dans les revendications 3 á 6. The main object of the present invention is to eliminate the aforementioned drawbacks.
This result has been achieved, in accordance with the invention, by adopting a method for folding handkerchiefs and the like, according to claim 1. And as regards the machine for carrying out said method, it comprises the characteristics according to claim 2. Other features are provided in claims 3 to 6.

Les avantages obtenus grâce à la présente invention consistent essentiellement en ce qu'il est possible d'assurer une aspiration uniforme et efficace de l'air sur toute la longueur de l'axe de chaque cylindre de la machine, même avec de faibles valeurs de pression différentielle entre l'intérieur et l'extérieur des cylindres, sans recourir à aucun surplus d'aspiration et de réduire ainsi fortement la consommation d'énergie correspondante et le coût de fabrication des mouchoirs; que les rouleaux et cylindres de traitement du papier du type décrit ci-dessus sont de fabrication simple, économique et fiable, même après une période de service prolongée; qu'il est possible d'améliorer la qualité du produit fini par effet de la retenue plus correcte et efficace des segments de papier sur la surface active des cylindres grâce à l'uniformité de la dépression dans chaque zone de la surface des cylindres; qu'il est possible de fabriquer des machines de n'importe quelle largeur autorisée, avec un grand nombre de canaux de travail, sans recourir à aucun surplus d'aspiration et en assurant dans chaque occasion le bon fonctionnement des machines elles-mêmes et le bon maintien du papier sur les surfaces actives des cylindres et rouleaux précités, et augmenter ainsi la production comme cela est exigé par le marché.The advantages obtained thanks to the present invention basically consist of what is possible ensure uniform and efficient suction of the air along the entire length of the axis of each machine cylinder even with low differential pressure values between the inside and outside of the cylinders, without resort to no excess suction and reduce thus strongly energy consumption corresponding and the manufacturing cost of handkerchiefs; that the rollers and cylinders of paper processing of the type described above are simple, economical and reliable to manufacture, even after an extended period of service; that it is possible to improve the quality of the finished product by effect of more correct and effective restraint of paper segments on the active surface of cylinders thanks to the uniformity of the depression in each area of the cylinder surface; that he is possible to manufacture machines from any what width allowed, with a large number of working channels, without using any surplus and ensuring on every occasion the proper functioning of the machines themselves and the good paper retention on the active surfaces of aforementioned cylinders and rollers, and thereby increase production as required by the market.

Ces avantages et caractéristiques de l'invention ainsi que d'autres seront plus et mieux compris de chaque homme du métier à la lumière de la description qui va suivre et à l'aide des dessins annexés donnés à titre d'exemplification pratique de l'invention, mais à ne pas considérer dans le sens limitatif; dessins sur lesquels la Fig. 1 représente schématiquement la vue de côté d'une machine conformément à l'invention; la Fig. 2 représente la vue en plan de la machine de la Fig. 1; la Fig. 3 représente la vue de face du groupe des cylindres de la machine de la Fig. 1; la Fig. 4 représente la vue de côté de droite du groupe de la Fig. 3; la Fig. 5 représente la vue en plan du groupe de la Fig. 3; la Fig. 6 représente la vue en coupe longitudinale détaillée d'un segment du cylindre plieur de la machine de la Fig. 1; la Fig. 7 représente la vue en coupe suivant la ligne A-A de la vue détaillée de la Fig. 6; la Fig. 8 représente la vue en coupe longitudinale détaillée d'une portion du cylindre de découpage de la machine de la Fig. 1, avec les chambres d'aspiration de largeur égale à deux canaux de travail; la Fig. 9 représente la vue en coupe suivant la ligne C-C de la la vue détaillée de la Fig. 8; la Fig. 10 représente la vue en coupe suivant la ligne B-B de la la vue détaillée de la Fig. 8; la Fig. 11 représente la vue en coupe longitudinale d'un cylindre comme celui de la Fig. 8, mais avec les chambres d'aspiration de largeur égale à un canal de travail.These advantages and characteristics of the invention as well as others will be more and better understood of each skilled person in light of the description which follows and using the drawings attached given as a practical example of the invention, but not to be considered in the limiting sense; drawings in which FIG. 1 schematically represents the side view of a machine according to the invention; Fig. 2 shows the plan view of the machine of FIG. 1; Fig. 3 represents the front view of the group of the cylinders of the machine of FIG. 1; Fig. 4 represents the right side view of the group of the Fig. 3; Fig. 5 shows the plan view of the group of FIG. 3; Fig. 6 shows the view in detailed longitudinal section of a segment of the machine folding cylinder of fig. 1; Fig. 7 shows the sectional view along line A-A of the detailed view of FIG. 6; Fig. 8 represents the detailed longitudinal section view of a portion of the cutting cylinder of the machine of FIG. 1, with the bedrooms suction width equal to two channels of job; Fig. 9 shows the sectional view along line C-C of the detailed view of the Fig. 8; Fig. 10 shows the sectional view along line B-B of the detailed view of the Fig. 8; Fig. 11 shows the sectional view longitudinal of a cylinder like that of FIG. 8, but with width suction chambers equal to a working channel.

Réduit à sa structure essentielle et en référence aux figures des dessins annexés, un procédé pour le pliage de mouchoirs en papier et similaires, dans une machine comprenant une pluralité de rouleaux ou cylindres pour le découpage et le pliage des mouchoirs à partir d'une bande (1) déroulée en continu à partir d'une bobine et subdivisée en plusieurs bandes ou canaux (10), conformément à l'invention, prévoit de:

  • en correspondance des stations de découpage (T) et de pliage (P) des mouchoirs, alimenter le papier avec une progression (F) de l'embase de la machine vers son sommet, de manière à faciliter le pliage des bords des mouchoirs à plier par effet de la force de gravité agissant sur le bord antérieur respectif, dans le sens de progression du papier, après interruption de l'aspiration dans la zone de contact avec le rouleau auxiliaire correspondant;
  • retenir le produit en cours de traitement sur la surface externe des rouleaux et cylindres de traitement correspondants, au moyen d'une aspiration forcée effectuée à travers plusieurs segments séparés contigus et coaxiaux de ces rouleaux et cylindres et éventuellement de volume réduit, et pour chaque segment à travers plusieurs series de trous alignés longitudinalement et de manière à délimiter une pluralité de chambres lesquelles comuniquent avec une chambre principale d'aspiration au moyen de plusieurs trous transversants radiaux en succession programmée sous la commande de la vanne avec la rotation du cylindre ou rouleau de manière à permettre une dépression uniforme sur toute la longueur de leurs axes, même avec des valeurs réduite de pression différentielle entre l'intérieur et l'extérieur des rouleaux et cylindres.
Reduced to its essential structure and with reference to the figures of the accompanying drawings, a method for folding handkerchiefs and the like, in a machine comprising a plurality of rollers or cylinders for cutting and folding handkerchiefs from a strip (1) unwound continuously from a reel and subdivided into several bands or channels (10), in accordance with the invention, provides for:
  • in correspondence with the stations for cutting (T) and folding (P) the tissues, feed the paper with a progression (F) from the base of the machine towards its top, so as to facilitate the folding of the edges of the tissues to be folded by the effect of the force of gravity acting on the respective anterior edge, in the direction of progression of the paper, after interruption of the suction in the zone of contact with the corresponding auxiliary roller;
  • retaining the product being treated on the external surface of the corresponding treatment rollers and cylinders, by means of forced suction carried out through several separate contiguous and coaxial segments of these rollers and cylinders and possibly of reduced volume, and for each segment through several series of holes aligned longitudinally and so as to delimit a plurality of chambers which communicate with a main suction chamber by means of several radial transverse holes in succession programmed under the control of the valve with the rotation of the cylinder or roller so as to allow uniform depression over the entire length of their axes, even with reduced values of differential pressure between the inside and the outside of the rollers and cylinders.

Et pour ce qui concerne la machine pour mettre en oeuvre ledit procédé, elle comprend une pluralité de cylindres et de rouleaux pour le découpage et le pliage transversal du papier, chacun desquels avec sa surface active respective munie de plusieurs groupes de trous traversants qui communiquent avec des chambres internes correspondantes d'aspiration de l'air.And as for the machine to put in works said process, it includes a plurality cylinders and rollers for cutting and transverse folding of the paper, each of which with its respective active surface provided with several groups of through holes which communicate with corresponding internal suction chambers air.

Plus particulièrement et en référence aux Fig. 3 - 7 des dessins annexés, le cylindre plieur (2) de la machine est constitué d'une pluralité de segments cylindriques coaxiaux (20) reliés en cascade unidirectionnelle avec interposition d'une vanne fixe (21) entre chaque paire de segments (20) contigus, laquelle est reliée à une source (AS) d'aspiration de l'air, de manière à délimiter une chambre principale d'aspiration (28) correspondante. La surface externe, c'est-à-dire active, de chaque segment (20) du cylindre (2) est cannelée longitudinalement de manière appropriée et en correspondance de chaque cannelure est fixée une plaque rectangulaire (23) avec plusieurs trous (24) traversants, de manière à délimiter une pluralité de chambres (22) qui communiquent avec ladite chambre (28) au moyen de plusieurs trous traversants radiaux (29), en succession programmée commandée par la vanne (21) avec la rotation du cylindre (2). Chaque segment (20) du cylindre (2) est monté sur un support correspondant (25) calé sur un arbre horizontal (26). Chaque vanne (21) est reliée au support'(25) du segment (20) respectif au moyen de deux coussinets (27).
La rotation de l'arbre (26) provoque la rotation correspondante des segments (20) du cylindre (2) par rapport aux vannes (21) d'aspiration de l'air. Par effet de cette rotation, les chambres (22) de chaque segment (20) se trouvent en communication avec la chambre (28) correspondante dans la séquence voulue, par l'intermédiaire des trous radiaux (29). De cette manière, chaque groupe de trous (24) se trouve asservi à l'aspiration séquentielle désirée, de manière à permettre la retenue et respectivement le relâchement programmé du papier sur la surface active du segment cylindrique (20) correspondant.
En référence aux Fig. 8 - 10 des dessins annexés, le cylindre de découpage (3) est réalisé en une seule pièce, avec la surface active munie de plusieurs cannelures longitudinales, chacune desquelles a une longueur égale à la largeur de deux canaux de travail et avec une plaque rectangulaire (34) correspondante munie de plusieurs trous traversants (35), de manière à délimiter autant de chambres (33), chacune desquelles communique à travers une ouverture (36) avec une vanne fixe (32) disposée en correspondance de sa ligne médiane et reliée à l'installation d'aspiration de l'air (AS): ladite vanne (32) étant coaxiale au cylindre (3) et supportée par ce dernier.
En alternative, en référence à la Fig. 11 des dessins annexés, chacune desdites cannelures longitudinales a une longueur égale à la largeur d'un canal de travail. Ceci permet d'augmenter ultérieurement l'uniformité du flux d'aspiration et ainsi le rendement de la machine.
Pour ce qui concerne les rouleaux auxiliaires (4), leur fabrication est identique à celle décrite ci-dessus pour le cylindre de découpage (3). Plus particulièrement, les rouleaux auxiliaires (4) ont la surface active munie de plusieurs chambres d'aspiration internes, lesquelles ont une longueur égale à la largeur d'un ou deux canaux de travail et sont reliées à des vannes correspondantes asservies à une installation d'aspiration de l'air (AS): lesdites chambres d'aspiration étant délimitées par autant de cannelures longitudinales pratiquées sur la surface active des rouleaux et couvertes par des plaques correspondantes munies de plusieurs trous traversants de manière à réaliser une communication pneumatique directe entre les chambres d'aspiration et la surface active des rouleaux (4).
La subdivision du cylindre (2) en plusieurs segments (20), chacun desquels muni d'une chambre (28) principale d'aspiration de longueur réduite pour exercer l'action de retenue du papier sur la surface active, permet d'obtenir une distribution uniforme et correcte des lignes de pression sur toute la longueur de l'axe du cylindre (2). Ceci permet de rendre plus efficace le traitement exécutée au moyen du cylindre plieur (2), et par conséquent d'améliorer la qualité du produit fini. Par ailleurs, ceci permet de réduire de façon draconienne les pertes de charge associées à l'action d'aspiration de l'air à l'intérieur du cylindre (2). Ce qui a été dit s'applique de manière analogue au cylindre (3) et aux rouleaux (4) pour ce qui concerne la subdivision de l'action d'aspiration entre les différentes chambres d'aspiration (33) réparties le long de leurs axes.More particularly and with reference to Figs. 3 - 7 of the accompanying drawings, the folding cylinder (2) of the machine consists of a plurality of coaxial cylindrical segments (20) connected in unidirectional cascade with interposition of a fixed valve (21) between each pair of segments (20 ) contiguous, which is connected to a source (AS) of air suction, so as to delimit a corresponding main suction chamber (28). The external, that is to say active, surface of each segment (20) of the cylinder (2) is appropriately grooved longitudinally and in correspondence with each groove is fixed a rectangular plate (23) with several holes (24) through, so as to define a plurality of chambers (22) which communicate with said chamber (28) by means of several radial through holes (29), in programmed succession controlled by the valve (21) with the rotation of the cylinder (2) . Each segment (20) of the cylinder (2) is mounted on a corresponding support (25) wedged on a horizontal shaft (26). Each valve (21) is connected to the support '(25) of the respective segment (20) by means of two bearings (27).
The rotation of the shaft (26) causes the corresponding rotation of the segments (20) of the cylinder (2) relative to the air suction valves (21). As a result of this rotation, the chambers (22) of each segment (20) are in communication with the corresponding chamber (28) in the desired sequence, via the radial holes (29). In this way, each group of holes (24) is slaved to the desired sequential suction, so as to allow the retention and respectively the programmed release of the paper on the active surface of the corresponding cylindrical segment (20).
With reference to Figs. 8 - 10 of the accompanying drawings, the cutting cylinder (3) is made in one piece, with the active surface provided with several longitudinal grooves, each of which has a length equal to the width of two working channels and with a rectangular plate (34) corresponding provided with several through holes (35), so as to delimit as many chambers (33), each of which communicates through an opening (36) with a fixed valve (32) arranged in correspondence of its center line and connected to the air suction installation (AS): said valve (32) being coaxial with the cylinder (3) and supported by the latter.
Alternatively, with reference to FIG. 11 of the accompanying drawings, each of said longitudinal grooves has a length equal to the width of a working channel. This further increases the uniformity of the suction flow and thus the efficiency of the machine.
Regarding the auxiliary rollers (4), their manufacture is identical to that described above for the cutting cylinder (3). More particularly, the auxiliary rollers (4) have the active surface provided with several internal suction chambers, which have a length equal to the width of one or two working channels and are connected to corresponding valves controlled by an installation of air suction (AS): said suction chambers being delimited by as many longitudinal grooves made on the active surface of the rollers and covered by corresponding plates provided with several through holes so as to achieve direct pneumatic communication between the suction chambers and the active surface of the rollers (4).
The subdivision of the cylinder (2) into several segments (20), each of which provided with a main suction chamber (28) of reduced length to exert the action of retaining the paper on the active surface, makes it possible to obtain a uniform and correct distribution of pressure lines over the entire length of the cylinder axis (2). This makes it possible to make the treatment carried out by means of the folding cylinder (2) more efficient, and consequently to improve the quality of the finished product. Furthermore, this makes it possible to drastically reduce the pressure losses associated with the action of suction of the air inside the cylinder (2). What has been said applies analogously to the cylinder (3) and to the rollers (4) as regards the subdivision of the suction action between the different suction chambers (33) distributed along their axes.

Claims (6)

  1. Process for folding paper handkerchieves and similar articles, in a machine comprising a plurality of rollers or cylinders (2,3) for cutting out and folding handkerchieves from a band (1) continuously unwound from a reel and subdivided into a number of strips or channels (10), co-operating with auxiliary rollers (4) in cutting stations (T) and folding stations (P), characterized by the fact that it comprises:
    -- in a position corresponding to the handkerchief cutting (T) and folding (P) stations, the feeding of the paper with a progressive movement (F) from the base of the machine towards its top, in such a way that the folding of the edges of the hankerchieves to be folded will be facilitated by the force of gravity acting on the respective front edge in the direction of travel of the paper after the interruption of the section in the zone of contact with the corresponding auxiliary roller (4);
    -- retention of the product, while being treated, on the external surface of the corresponding processing rollers (3) and cylinders (2), by means of forced suction exerted through a number of separate contiguous and coaxial segments (20) of those rollers (3) and segments (2) and possibly of reduced volume and for each segment (20) across a number of series of holes (24,35) aligned longitudinally and in such a manner as to delimit a plurality of chambers (22) which communicate with a main suction chamber (28) by means of a number of holes passing through several traversing radial holes in programmed sequence under the control of the valve (21), with the rotation of the cylinder (3) or roller (2), in such a way as to render possible a uniform depression over the entire length of their axes, even in the event of reduced differential pressure values between the interior and the exterior of the rollers (3) and cylinders (2).
  2. Machine for folding paper handkerchieves, serviettes and similar articles, in accordance with the process described in Claim 1, comprising a plurality of cylinders and rollers (2, 3) for the cutting and transversal folding of the paper, characterized by the fact that the folding cylinder (2) over which the paper runs with a progressive movement (F) from the base of the machine towards its top, in co-operation with auxiliary rollers (4), is formed by a plurality of coaxial rical segments (20), connected in unidirectional cascade, a fixed gate (21) being interposed between each pair of adjacent segments (20) and connected to an air suction source (AS), in such a way as to delimit a corresponding main suction intake chamber (28); and that the external i.e. active, surface of each segment (20) of the said cylinder (2) is longitudinally channelled; and that a rectangular plate (23) with a number of through-holes (24) is affixed in a position corresponding to each channelling, in such a way as to delimit a plurality of chambers (22) by means of a number of radial through-holes (29), in succession programmed by the control of the valve (21) with the rotation of the cylinder (2).
  3. Machine in accordance with Claim 2, characterized by the fact that each segment (20) of the said cylinder (2) is mounted on a corresponding support (250 keyed onto a horizontal shaft (26).
  4. Machine in accordance with Claim 2, characterized by the fact that each gate (21) is connected to the support (25) of the respective segment (26) by means of two bearings (27).
  5. Machine in accordance with Claim 2, characterized by the fact that the cutting cylinder (3) is made in one piece, with the active surface provided with a number of longitudinal channellings, each of which has a length equal to the width of one or two operating channels, and with a rectangular plate (34) having a number of through-holes (35), in such a way as to delimit a corresponding number of chambers (33), each of which communicates via an aperture (36) with a fixed gate (33), positioned in accordance with its median line and connected to the air suction intake installation (AS); the said gate (12) being coaxial with the cylinder and supported by this latter.
  6. Machine in accordance with Claim 2, characterized by the fact that the active surface of the auxiliary rollers (40) is provided with a number of internal suction chambers, having a length equal to the width of one or two operating channels and connected to corresponding gates subject to the control of an air suction intake installation (AS); the said suction chambers being delimited by a corresponding number of longitudinal channellings, produced on the active surface of the rollers (4) and covered by corresponding plates provided with a number of through-holes, in such a way as to ensure direct pneumatic communication between the suction chambers and the active surface of the rollers (4).
EP94830349A 1993-07-15 1994-07-11 Method and means for folding paper handkerchiefs or the like Expired - Lifetime EP0634352B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITFI930132 1993-07-15
ITFI930132A IT1263095B (en) 1993-07-15 1993-07-15 METHOD AND MACHINE FOR FOLDING PAPER TISSUES AND SIMILAR

Publications (2)

Publication Number Publication Date
EP0634352A1 EP0634352A1 (en) 1995-01-18
EP0634352B1 true EP0634352B1 (en) 1998-12-16

Family

ID=11350534

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94830349A Expired - Lifetime EP0634352B1 (en) 1993-07-15 1994-07-11 Method and means for folding paper handkerchiefs or the like

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EP (1) EP0634352B1 (en)
AT (1) ATE174572T1 (en)
DE (1) DE69415227T2 (en)
ES (1) ES2127907T3 (en)
IT (1) IT1263095B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106739174B (en) * 2016-12-23 2018-09-07 泉州智信专利技术开发有限公司 A kind of paper napkin machine

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB662947A (en) * 1949-02-02 1951-12-12 Harris Seybold Co Improvements in or relating to a sheet delivery mechanism for machines such as printing machines
DE2439790A1 (en) * 1970-12-24 1976-03-11 Koenig & Bauer Ag Vacuum suction feed drum for rotary printing machine - has suction holes connected to vacuum pump via sealed chambers and valves
AU460068B2 (en) * 1972-07-04 1975-04-17 Wentworth Harris David Improvements in or relating tothe manufacture of paper serviettes
IT1213807B (en) * 1987-07-28 1990-01-05 Perini Finanziaria Spa EQUIPMENT FOR THE PRODUCTION AND PACKAGING OF NAPKINS FROM CONTINUOUS TAPE IN PAPER OR OTHER

Also Published As

Publication number Publication date
ATE174572T1 (en) 1999-01-15
DE69415227T2 (en) 1999-07-08
ITFI930132A0 (en) 1993-07-15
DE69415227D1 (en) 1999-01-28
ITFI930132A1 (en) 1995-01-15
IT1263095B (en) 1996-07-24
ES2127907T3 (en) 1999-05-01
EP0634352A1 (en) 1995-01-18

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