EP0408591B1 - Procede et dispositif de guidage sur coussin d'air de feuilles ou bandes de materiaux le long d'une voie de transport, notamment une voie de transport courbee - Google Patents

Procede et dispositif de guidage sur coussin d'air de feuilles ou bandes de materiaux le long d'une voie de transport, notamment une voie de transport courbee Download PDF

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Publication number
EP0408591B1
EP0408591B1 EP89903127A EP89903127A EP0408591B1 EP 0408591 B1 EP0408591 B1 EP 0408591B1 EP 89903127 A EP89903127 A EP 89903127A EP 89903127 A EP89903127 A EP 89903127A EP 0408591 B1 EP0408591 B1 EP 0408591B1
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EP
European Patent Office
Prior art keywords
conveying
free
over
negative pressure
nozzles
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP89903127A
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German (de)
English (en)
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EP0408591A1 (fr
Inventor
Hilmar Vits
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Heidelberger Druckmaschinen AG
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Heidelberger Druckmaschinen AG
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Publication of EP0408591A1 publication Critical patent/EP0408591A1/fr
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Classifications

    • 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
    • B65H29/245—Air blast devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H23/00—Registering, tensioning, smoothing or guiding webs
    • B65H23/04—Registering, tensioning, smoothing or guiding webs longitudinally
    • B65H23/24—Registering, tensioning, smoothing or guiding webs longitudinally by fluid action, e.g. to retard the running web
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2801/00—Application field
    • B65H2801/03—Image reproduction devices
    • B65H2801/21—Industrial-size printers, e.g. rotary printing press

Definitions

  • a known device for floating guidance (DE-GM 69 39 363) the material web is alternately supported on an air cushion and exposed to negative pressure.
  • the device consists of perforated nozzle bodies through which air is alternately blown out in the direction of conveyance to build up air cushions or is sucked in through the air.
  • This has the consequence that such a device can only transport material webs that are under web tension without contact.
  • Free-running arches on the other hand, would be drawn in with their front and rear ends in the areas in which only suction forces are effective, so that contact is unavoidable.
  • the object of the invention is to provide a method and a device for the floating guiding of sheet-like or sheet-like material, in which or with which the material is transported flutter-free and absolutely contact-free even with the most varied curvature of the conveying path.
  • the invention relates to a method for floating Execute sheet or sheet material over a conveyor line, in which the material is supported on one side on air cushions and a vacuum is applied between the air cushions.
  • the object is achieved in that the adjacent air cushions are formed by free jets flowing past and crossing one another with a sufficient distance, and in that the negative pressure is built up on the side of the material facing away from the free jets and penetrates through the free jets.
  • the invention furthermore relates to a device for the suspended guiding of sheet-like or web-shaped material over a conveying path, which consists of blowing agent-fed floating nozzles arranged at a distance from one another, between which nozzle bodies and the material by the blowing agent an overpressure can be built up in the form of air cushions is and between their adjacent nozzle bodies means are arranged to build up a negative pressure effective on the material.
  • the object is achieved in that free jet nozzles are arranged in series in order to build up the air cushions in the nozzle bodies at a mutual distance and at a distance from the respectively opposite nozzle bodies, of which the free jet nozzles formed in one nozzle body are opposite those in the other Nozzle bodies designed free jet nozzles are offset by about half a pitch (distance between adjacent free jet nozzles) in the direction of the row in such a way that the free jets flow past one another and intersect and that as a means of building up the negative pressure effective on the material between the nozzle bodies, suction shafts for generating the negative pressure the side of the material facing away from the free jet nozzles are arranged.
  • the constant change between pressure and suction forces has a positive effect on the stable guidance because the material takes the form of a standing wave.
  • the material is preferably conveyed slowly by tensile forces acting on its front edge. Since in the method according to the invention the material is not in a flat position over a ventilated guide surface, but because of the alternating overpressure and underpressure is conveyed in a wave shape, the end of the sheet cannot flutter and / or its corners turn over. In the case of web-shaped material, the longitudinal folds caused by tension in the conventional method and which reduce the quality of the finished product cannot form.
  • the suction shafts are equipped with injectors to generate the negative pressure without connecting all suction channels to a fan.
  • the injectors consist of a tube fed with blowing agent and provided with small nozzles in a narrow division, or are supplied within the suction channel by a common blowing agent supply of the floating nozzles when the guide is level.
  • the invention provides that for the sluggish transport of the sheets extending across the conveying line, driven rods with grippers are provided with which the Leading edge of the sheet is detectable.
  • the air cushion effect includes the presence of the material above the nozzle body and the vacuum effect includes the presence of the material above the gap.
  • the outermost end of the arch alternately and incompletely covers these areas, so that this end of the arch is less well guided and therefore tends to flutter.
  • further rods circulate between the rods equipped with grippers and that all rods are provided with blades along their length, the flow shadow of which extends to the next blade.
  • This flow shadow ensures that the differential speed between the material and the blowing agent remains so small that the buoyancy forces acting on the material can no longer cause flutter. This effect can be further improved if the conveyor line is shielded by a wall. Additionally or alternatively, it is possible to arrange nozzles-fed nozzles at a great distance above the conveyor section, the free jets of which blow flat onto the conveyor plane in the conveying direction and generate a blowing agent flow in the channel formed by the wall and the material at a lower speed than the conveying speed.
  • the S-shaped conveyor section for printed sheets 1a, 1b, 1c shown in FIG. 1 is arranged between a take-over roller 4 of an offset printing machine and a sheet deposit 6.
  • a pair of revolving chains 5 are provided which are guided over guide elements (not shown) and which carry bars 2 arranged transversely to the conveying direction and which are equipped with gripper elements 2a for detecting the start of a sheet.
  • the takeover roller 4 and the bars 2 equipped with grippers 2a are matched to one another in terms of their speed so that the bars 2 meet with a recess 4a in the takeover roller 4 in order to be able to detect the beginning of the arc here without collision.
  • Shovels 8a are attached to the bars 2.
  • blades 8b are provided between the rods 2 on further rods, not shown.
  • each nozzle body 3 is designed as a hollow box and has on its side facing the conveying path a convexly curved back 11, on the edges of which there are circular transitions 12 and on the back a bottom 13 with inlets 13a, via which Blowing agent gets into the nozzle body 3.
  • rows of holes 15 are arranged as nozzles, from which free jets 15a emerge.
  • the holes 15 of adjacent nozzle bodies 3 are offset by half a division, so that the free jets 15a pointing in the opposite directions flow past one another at a distance and strike the opposite curved back 11.
  • the structure and the aerodynamic function of such floating nozzles is known from DE 36 07 370.
  • suction shafts 21 The spaces between the nozzle bodies 3, 3a form suction shafts 21.
  • these suction shafts 23 are delimited by walls 16, which also delimit blowing agent feeds 14, from which the blowing agent is fed to the nozzle boxes 3 via the inlets 13a.
  • blow pipes 17 are arranged between the walls widening at the top, the blow agent supply of which can be individually adjusted, and blow agent jets 18 a emerge from their nozzle holes 18 according to the injector principle and blow into the suction shafts 23. Due to the distances between the free jets 15a this negative pressure can penetrate the free jets 15a and take effect on the bends 1, 1a, 1b, 1c.
  • the sluggishly conveyed sheet 1a, 1b, 1c is exposed to an overpressure in the area of the back 11 and to an underpressure in the area of the suction channels 23 due to the free jets 15a directed towards one another, so that the sheet is conveyed over the conveying path in the form of a standing wave. Due to the blades 8a, 8b conveyed with the arc, a flow shadow which is dashed in FIG. 1 and which promotes flutter-free guidance is formed on the side of the arc 1a, 1b, 1c facing away from the nozzle bodies 3.
  • the quiet conveyance is further favored by the fact that a channel 9a is formed by a partition 9 arranged in the convex region of the conveying path.
  • free-jet nozzles 10 are arranged in the concave region of the conveying section, which ensure that a blowing agent flow that runs along with the arc is established, which also favors the running flow in channel 9a.
  • FIGS. 5 and 6 differs from that of FIGS. 2 and 3 only in that the negative pressure in the suction channels is not generated by the blow jets from special blow pipes, but by blow jets 21 which emerge from the nozzle bodies 3. So that these blowing jets 21 from adjacent nozzle bodies do not interfere with one another with regard to their injector action, they are offset from one another and shielded from one another by separating plates 22. In this case, the suction force can be adjusted by throttling the nozzle holes for the injector jets 21 to a greater or lesser extent.
  • the diagram of FIG. 4 shows the load-bearing behavior of the floating nozzles in a dimensionless representation.
  • the abscissa represents the distance of the Material 1 from the back 11 of the floating nozzles.
  • the ordinate represents the load-bearing capacity of the floating nozzle.
  • the dimensionless distance is the ratio of the distance to the length of the back 11 of the floating nozzles in the conveying direction.
  • the dimensionless load capacity is the ratio of the absolute load capacity in the area of the back 11 to the product of the sum of the hydraulic hole cross sections of the nozzles 15 and the pressure of the blowing jets 15a acting on the material.
  • the maximum load capacity at point A is around 20. It must not be reached, otherwise contact will occur.
  • the maximum distance at point B is 0.2. It is not reached because no material is without weight.
  • the load capacity O-C at point C corresponds to the weight G of the material on a level, horizontal route.
  • the load capacity at point D corresponds to the weight O-C of the material plus the centrifugal force C-D acting on it according to the ordinate yB.
  • a vacuum of the size of the load capacity 5 must be superimposed, which is the same size as the centrifugal force C-D at point D.
  • the load capacity curve remains unchanged, but the abscissa is then at level E and ordinate yE is valid.
  • the centrifugal force must also be compensated, which corresponds to the load capacity 5 if the same curvature is assumed as in the concave part.
  • the abscissa with level F and the ordinate yF apply to the convex part.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Discharge By Other Means (AREA)
  • Advancing Webs (AREA)
  • Delivering By Means Of Belts And Rollers (AREA)
  • Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)

Abstract

Un procédé et un dispositif servent à guider sur coussin d'air des feuilles ou des bandes de matériaux. Les feuilles ou bandes de matériaux (1a, 1b, 1c) sont guidées sur des jets de suspension agencés d'un seul côté et fonctionnant selon le principe du coussin d'air. Entre les jets de suspension individuels sont agencés des puits d'aspiration, de sorte que le matériau est soumis alternativement pendant son transport à des forces de surpression et de dépression. Il est ainsi guidé sur un plan voulu de transport sans déformation ni mouvement d'ondulation. L'invention convient en particulier pour guider des matériaux sur des voies de transport convexes et/ou concaves, comme lors du transport par traction de feuilles imprimées entre la sortie d'une imprimante et le dépôt des feuilles.

Claims (10)

  1. Procédé de guidage flottant de matière sous forme de feuilles ou de bandes sur une voie de transport où la matière est soutenue d'un côté sur des coussins d'air et est sollicitée par une dépression entre les coussins d'air, caractérisé en ce que les coussins d'air adjacents s'écoulent les uns devant les autres et se croisent avec un espacement suffisamment grand et en ce que la dépression est engendrée sur le côté de la matière qui est opposé aux jets libres et s'exerce à travers les jets libres.
  2. Procédé selon la revendication 1, caractérisé en ce que la matière est transportée sur des voies de transport avec courbure convexe et des voies de transport avec courbure concave, la dépression dans les voies de transport avec courbure convexe augmentant à mesure que la vitesse de transport augmente tandis qu'elle diminue dans les voies de transport avec courbure concave à mesure que la vitesse de transport diminue.
  3. Dispositif de guidage flottant de matière (1a, 1b, 1c) sous forme de feuilles ou de bande, sur une voie de transport, qui se compose de buses de flottation alimentées en agent de soufflage, espacées mutuellement l'une de l'autre et entre les corps à buses (3) et la matière (1a, 1b, 1c) peut être créée, par l'agent de soufflage, une surpression sous la forme de coussins d'air tandis qu'entre des corps à buses (3) adjacents, il est prévu des moyens (16, 17) pour produire une dépression agissant sur la matière (1a, 1b, 1c), caractérisé en ce que, pour la génération des coussins d'air, il est prévu dans les corps à buses (3) des buses à jets libres (15), disposées en étant espacées mutuellement dans une rangée et en étant espacées des corps à buses (3) respectivement situés en regard, en ce que les buses à jets libres (15), formées dans un corps à buses (3) sont décalées, par rapport aux buses à jets libres (15) formées dans l'autre corps à buses (3), à peu près d'un demi-pas (espacement entre des buses à jets libres 15 adjacentes ) dans la direction de la rangée de telle sorte que les jets libres (15a) s'écoulent l'un devant l'autre et se croisent, et en ce qu'il est prévu comme moyens de génération de la dépression agissant sur la matière (1a, 1b, 1c), entre les corps à buses (3), des alvéoles d'aspiration (23) pour produire la dépression sur le côté de la matière (1a, 1b, 1c) qui est opposé aux buses à jets libres (15).
  4. Dispositif selon la revendication 3, caractérisé en ce que la dépression produite par les alvéoles d'aspiration (23) est réglable.
  5. Dispositif selon une des revendications 3 ou 4, caractérisé en ce que les alvéoles d'aspiration (23) sont pourvus d'injecteurs (18) répartis sur leur longueur.
  6. Dispositif selon la revendication 5, caractérisé en ce que, dans une voie de guidage de profil uniforme, les injecteurs comportent une alimentation commune (14) en agent de soufflage.
  7. Dispositif selon une des revendications 5 ou 6, caractérisé en ce que, dans le cas d'une voie de guidage qui est seulement rectiligne, les injecteurs et les buses de flottation comportent une alimentation commune en agent de soufflage.
  8. Dispositif selon une des revendications 3 à 7, caractérisé en ce que, dans le cas d'un transport flottant de la matière en forme de feuilles (1a, 1b, 1c), où il est prévu des barres (2) munies de pinces (2a), s'étendant transversalement au-dessus de la voie de transport, entraînées et à l'aide desquelles le bord avant de la matière (1a, 1b, 1c) en forme de feuilles peut être saisi, d'autres barres se déplacent par rotation entre les barres (2) équipées de pinces (2a) et toutes les barres sont pourvues sur leur longueur d'aubes (8a, 8b) dont l'effet d'écran sur l'écoulement s'étend jusqu'à l'aube suivante (8a, 8b).
  9. Dispositif selon la revendication 8, caractérisé en ce que la voie de transport est définie par une paroi (9) sur le côté opposé aux corps à buses (3).
  10. Dispositif selon la revendication 9, caractérisé en ce qu'il est prévu au-dessus de la voie de transport des buses (10) disposées avec un grand espacement, alimentées en agent de soufflage et dont les jets libres sont projetés à plat sur le plan de transport dans la direction de transport et produisent un courant d'agent de soufflage, d'une vitesse plus petite que la vitesse de transport, dans le canal (9a) créé par la paroi (9) et la matière (1a, 1b, 1c).
EP89903127A 1988-04-02 1989-03-03 Procede et dispositif de guidage sur coussin d'air de feuilles ou bandes de materiaux le long d'une voie de transport, notamment une voie de transport courbee Expired - Lifetime EP0408591B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3811264 1988-04-02
DE3811264 1988-04-02
DE3841909A DE3841909A1 (de) 1988-04-02 1988-12-13 Verfahren und vorrichtung zum schwebenden fuehren von bogen- oder bahnfoermigem material ueber eine foerderstrecke, insbesondere eine gekruemmte foerderstrecke
DE3841909 1988-12-13

Publications (2)

Publication Number Publication Date
EP0408591A1 EP0408591A1 (fr) 1991-01-23
EP0408591B1 true EP0408591B1 (fr) 1993-06-09

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EP89903127A Expired - Lifetime EP0408591B1 (fr) 1988-04-02 1989-03-03 Procede et dispositif de guidage sur coussin d'air de feuilles ou bandes de materiaux le long d'une voie de transport, notamment une voie de transport courbee

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Country Link
US (1) US5222726A (fr)
EP (1) EP0408591B1 (fr)
DE (1) DE3841909A1 (fr)
WO (1) WO1989009177A1 (fr)

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DE4433644B4 (de) * 1994-09-21 2005-03-03 Heidelberger Druckmaschinen Ag Verfahren und Vorrichtung zur Führung eines Bogens
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EP1970334A3 (fr) 2007-03-15 2009-12-30 Heidelberger Druckmaschinen Aktiengesellschaft Machine de traitement de feuilles dotée d'un dispositif de transport pneumatique
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Also Published As

Publication number Publication date
US5222726A (en) 1993-06-29
WO1989009177A1 (fr) 1989-10-05
DE3841909C2 (fr) 1990-09-13
DE3841909A1 (de) 1989-10-19
EP0408591A1 (fr) 1991-01-23

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