EP3169528A1 - Suction plenum, system for transporting flat supports, and printing machine thus equipped - Google Patents

Suction plenum, system for transporting flat supports, and printing machine thus equipped

Info

Publication number
EP3169528A1
EP3169528A1 EP15737990.0A EP15737990A EP3169528A1 EP 3169528 A1 EP3169528 A1 EP 3169528A1 EP 15737990 A EP15737990 A EP 15737990A EP 3169528 A1 EP3169528 A1 EP 3169528A1
Authority
EP
European Patent Office
Prior art keywords
suction
printing
box
printing machine
chamber
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.)
Granted
Application number
EP15737990.0A
Other languages
German (de)
French (fr)
Other versions
EP3169528B1 (en
Inventor
Pascal MARCIANO
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.)
Bobst Mex SA
Original Assignee
Bobst Mex SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Bobst Mex SA filed Critical Bobst Mex SA
Publication of EP3169528A1 publication Critical patent/EP3169528A1/en
Application granted granted Critical
Publication of EP3169528B1 publication Critical patent/EP3169528B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J11/00—Devices or arrangementsĀ  of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
    • B41J11/0025—Handling copy materials differing in width
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J11/00—Devices or arrangementsĀ  of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
    • B41J11/007—Conveyor belts or like feeding devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J11/00—Devices or arrangementsĀ  of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
    • B41J11/0085—Using suction for maintaining printing material flat
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J13/00—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, specially adapted for supporting or handling copy material in short lengths, e.g. sheets
    • B41J13/0063—Handling thick cut sheets, e.g. greeting cards or postcards, larger than credit cards, e.g. using means for enabling or facilitating the conveyance of thick sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
    • B41J29/12—Guards, shields or dust excluders
    • B41J29/13—Cases or covers

Definitions

  • the present invention relates to a suction box for a planar media transport system in a planar media printing machine.
  • the invention relates to a plane support transport system comprising at least one suction box.
  • the invention also relates to a planar media printing machine, equipped with a planar media transport system comprising at least one suction box.
  • a printing machine is used in the packaging industry for printing flat media, such as sheets, or a web of paper or cardboard.
  • the machine comprises several successive stations.
  • a first station located furthest upstream is an introductory station successively introducing the support.
  • the introductory station supplies several printing stations, in the form of one or more printing units placed one after the other.
  • Each of the printing units prints a specific color with an ink having the equivalent coloring.
  • the machine can easily accept different media formats.
  • a receiving station which collects the printed medium with an image is provided at the end of the machine.
  • the printing machines comprise one or more printing units, depending on the number of colors desired.
  • the support is moved longitudinally from upstream to downstream from the introduction station, to the printing units, to the receiving station.
  • To obtain a final image of quality on the printed medium it is especially necessary that all the printed dots of different colors arise exactly next to each other. It is also necessary that the printed dots are not deformed.
  • the quality of the printing obtained on the flat support depends not only on the quality of the printing machines, the quality of the inks used, the quality of the media introduced, but also the quality and precision of the system (s). used.
  • the transport of the support is provided by a vacuum transport system using either a belt, flat belts, or driven steel rollers to move the support longitudinally from one printing unit to another from upstream to downstream from the introductory station to the receiving station.
  • a vacuum transport system using either a belt, flat belts, or driven steel rollers to move the support longitudinally from one printing unit to another from upstream to downstream from the introductory station to the receiving station.
  • transport ensures the most consistent media speed possible.
  • Another principle is that the support must be maintained as firmly as possible and must be perfectly guided by the transport system, so as not to deviate during printing by the printing group (s) or between the printing group (s). State of the art
  • US 6,471,430 discloses a paper or cardboard type media printing machine comprising a transport system.
  • the sheets are taken from a sheet feed and transported on a first endless conveyor belt.
  • the sheets are maintained during their transport by means of a suction system and pass under first printing units and under a first ink dryer downstream of the first printing units.
  • the sheets are then returned and transported by a second endless conveyor belt under second printing units and under a second ink dryer for subsequent recovery at an output station.
  • the conveyor belts are made with a series of through-holes to allow the air to be drawn in and to obtain the holding effect for transporting the sheets into the machine.
  • Suction boxes are placed under the strips so as to generate the vacuum of air.
  • the air void also generates disturbances in the dryers. Indeed, these dryers include a suction part which is necessary to suck the moisture generated during drying. In order to achieve optimum drying, the suction is made from the printed side of the sheets and upwards. However, the presence of two air gaps in opposite directions, both underneath for holding the sheets on the web and above for drying the sheets, will affect the flatness of the sheets and the accuracy of the transport.
  • a main object of the present invention is to provide a suction box for a planar media transport system in a planar media printing machine.
  • a second objective is to provide a suction box for transporting media to be printed which ensures a good hold of these media on the conveyor belt of the transport system.
  • a third objective is to develop a suction box to minimize losses when a carrier is transported.
  • a fourth objective is to make a box with band disturbances reduced to a minimum.
  • a fifth objective is to adapt an endless conveyor system for printing flat supports comprising at least one suction box.
  • a sixth objective is to solve the technical problems mentioned for caissons and transport systems of the state of the art.
  • Yet another object is to further improve the print quality for a flatbed printing machine equipped with at least one printing unit.
  • a suction box for a planar media transport system with at least one endless band formed with a set of through holes in a media printing machine equipped with less a printing group comprising:
  • suction means capable of generating an air vacuum
  • a suction compartment divided into at least two separate chambers a first suction chamber with an adjustable volume, in communication with the suction means, for applying through the holes of the strip the vacuum of air to the supports transported by the band, and
  • the suction box is characterized in that the suction compartment has an open upper face provided with a holding arrangement, allowing movement of the band.
  • the open upper surface of the compartment makes it possible to directly transfer the air vacuum to the strip and thus to the plane supports.
  • the band is held and circulates at the upper face.
  • the dimensionally adjustable suction chamber makes it easy to adjust the intensity of the applied air vacuum.
  • the face at which the strip passes thus has a variable suction zone, depending on the adjustable chambers. This makes it possible to maintain a strong and optimum suction at the suction zone or zones, in order to maintain the flatness of the flat supports, the absence of displacement of the flat supports with respect to the conveyor belt and thus the accuracy of the transport. .
  • the surface of this area varies for example according to the format of the flat supports to be transported and printed.
  • the operation of the media printing machine will be optimal, the air vacuum being applied directly under the conveyor belt whose extent is limited to the area in which the transported plane support is located.
  • the size of the chambers providing the air space under the transported supports will be adapted, so as not to disturb the operation of the dryers.
  • a planar support is defined, by way of non-exhaustive example, as a sheet, plate, continuous web material such as paper, cardboard, corrugated cardboard, laminated corrugated cardboard, flexible plastic, for example polyethylene (PE), polyethylene terephthalate (PET), bioriented polypropylene (BOPP), or other polymers, or other materials.
  • the planar support is defined, by way of non-exhaustive example, as a sheet intended to form a blank, and then a packaging box.
  • the longitudinal direction is defined by reference to the trajectory of the plane support in the printing machine, according to its median longitudinal axis.
  • the upstream and downstream directions are defined with reference to the direction of travel along the path of the support, in the longitudinal direction throughout the printing machine.
  • a planar media transport system with at least one endless belt formed with a set of through holes, in a media printing machine equipped with at least one group. printer comprises at least one suction box having one or more technical characteristics described below and claimed.
  • a flat media printing machine equipped with at least one printing unit, comprises a media transport system, comprising at least one suction box having one or more technical features described herein. below and claimed.
  • a flat media printing machine equipped with at least one printing unit, comprises a media transport system having one or more technical features described below and claimed.
  • FIG. 1 shows a perspective view of a printing machine, comprising a transport system and suction boxes according to the invention
  • FIG. 2 to 5 respectively show a side view from above, from above in perspective downstream and from above upstream perspective of a suction box according to a first embodiment of the invention.
  • FIG. 6 shows a top view in perspective upstream of a suction box according to a second embodiment of the invention.
  • a printing machine 1 is used to print plate-like media, for example corrugated sheets.
  • the machine 1 is a digital printing machine, which includes for example some constituent elements described in US 6,471, 430.
  • the machine 1 comprises in particular a set of four printer groups 2, arranged in line one after the other.
  • Each of the printing units 2 is provided with at least one digital printing head, without contact for example ink jet.
  • a set of heads is oriented downwards, the upper face of the sheets transported by the strip 6 is then printed.
  • the inks black, cyan, magenta and yellow are successively printed by the printer groups 2 on the sheets.
  • the sheets are fed (arrows F in Fig. 1) by a feed station (not shown) mounted upstream of the printing machine 1 (not shown).
  • the sheets are then seized, transported, move longitudinally F, and leave F printed at a receiving station (not shown), mounted downstream of the printing machine 1.
  • Two dryers 3, with steam evacuation pipes, are placed downstream of the printing units 2.
  • the sheets to be printed are conveyed from upstream to downstream by a transport system 4.
  • the transport system 4 comprises at least one carpet or belt, in this case a single endless metal band 6, which is mounted between an upstream first cylinder 7 and a second downstream cylinder 8.
  • the endless belt 6 is formed with a set of through holes (not visible in Fig. 1).
  • At least one of the two cylinders 7 and 8 is rotated (arrow R in Fig. 1) by means of a motor 9, which causes the strip 6.
  • the cylinders 7 and 8 and the strip 6 are mounted on a chassis 10.
  • the sheets remain plated on the strip 6, thanks to suction boxes also called vacuum boxes 1 1, and pass under the printer groups 2 and dryers 3. Only vacuum boxes 1 1 upstream of the printer groups 2, between the groups printers 2, and downstream of printing units 2 have been shown in dotted lines in FIG. 1.
  • the printing machine 1 advantageously comprises an upstream coating group 12.
  • This upstream coating group 12 is arranged upstream of the first printer group 2, just after the feed station.
  • the upstream coating unit 12 is placed in line with the upstream cylinder 7.
  • a dryer 3 may be inserted between the upstream coating unit 12 and the first printing unit 2.
  • the printing machine 1 advantageously includes a downstream coating group 13.
  • This downstream coating group 9 is arranged downstream of the last printer group 2, and downstream of the dryers 3, just before the receiving station.
  • the downstream coating group 13 is placed in line with the downstream cylinder 8.
  • Each box suction 1 1 comprises an upper face, oriented towards the lower face of the strip 6, the sheets being plated on the lower face of the strip 6.
  • the strip 6 passes at the upper face.
  • Each of the dryers 3 is associated with a suction box 1 1.
  • Each interval between the printing units 2 is associated with a suction box January 1.
  • the box 1 1 according to a first embodiment comprises at the upper face a holding arrangement of the strip 6 comprising a series of transverse rollers, equidistant and parallel to each other 14 (Figs 2, 3, 4 and 5).
  • the central roller 14 has been removed for the box 1 1 shown in FIG. 3.
  • the rollers 14 are kept free to rotate by bearings.
  • the rollers 14 are flush with the upper face of the compartment 16.
  • the band 6 moves on the rollers 14, which limits the friction and vibrations.
  • the suction box 1 1 comprises (Figs 2 and 3) a suction compartment 16, delimited by two upstream and downstream sidewalls 17 and 18, two longitudinal front and rear walls 19 and 21, and a bottom 22.
  • a suction compartment 16 delimited by two upstream and downstream sidewalls 17 and 18, two longitudinal front and rear walls 19 and 21, and a bottom 22.
  • the front wall 19 has been removed for the box 1 1 shown in FIG. 4.
  • the box 1 1 with the suction compartment 16 has an open upper face.
  • the box 1 1 with its compartment 16 is in communication with suction means 23 comprising for example a motor 24 able to generate an air gap in the compartment 16.
  • the compartment 16 is divided into at least two chambers, in this case three chambers 26, 27 and 28.
  • a second front chamber 26 and a second rear chamber 27 surround a first central aspiration chamber 28.
  • the chamber Central 28 is adjustable and has a variable capacity selected by the operator.
  • the two front and rear chambers 26 and 27 remain at ambient pressure.
  • the central chamber 28 is in communication with the suction means 23, for applying through the holes of the strip 6 the vacuum of air to the supports carried by the strip 6.
  • the suction means 23 used to create the vacuum of air.
  • the central chamber 28 is delimited by two movable partitions 31 and 33.
  • a movable partition before 31 separates the second front chamber 26 of the first central chamber 28.
  • a rear movable partition 33 separates the second rear chamber 27 from the first central chamber 28.
  • the suction box January 1 fits the size of the sheet transported.
  • Soft plastic seals or flaps ensure sealing the central chamber 28 by rubbing against the upstream and downstream side walls 17 and 18 and against the bottom 22.
  • the central chamber 28 and the ambient pressure chambers 26 and 27 are oriented longitudinally, the movable partitions 31 and 33 being generally oriented longitudinally from upstream to downstream.
  • the movable partitions 31 and 33 are divergent from each other, advantageously being inclined with respect to each other.
  • the partitions 31 and 33 are favorably inclined to each other (angles a1) with respect to a median longitudinal vertical plane passing through the median longitudinal axis L of the box 1 1 and the machine 1. In such a configuration, it becomes impossible to completely close the central chamber 28 between the two movable partitions 31 and 33.
  • the partitions have a configuration oriented in a V view from above, when they are close to each other which prevents clogging of the opening 29 of the suction means 23.
  • the casing 11 advantageously comprises actuating means 34 for the two movable partitions 31 and 33 (see Figs 2 and 4).
  • the actuating means 34 preferably comprise at least one motor, in this case a single motor
  • the motor 36 actuating and moving the two partitions 31 and 33 by translation.
  • the motor 36 is installed in a housing located behind the front wall 19. This housing is particularly advantageous because it allows the addition of the motor 36 inside the volume of the suction box 1 1, rather than the outside of it.
  • the actuating means 34 may comprise a worm 37.
  • the screw 37 extends transversely through the compartment 16 substantially in its center.
  • the screw 37 is kept rotated by bearings.
  • the screw 37 passes through each of the two movable partitions 31 and 33 with the aid of a slider piece.
  • a pinion 38 is fixed to the worm 37 at its front end.
  • the motor 36 is mechanically connected to a drive means such as a chain or belt 39, which rotates (arrows A and B in Fig. 2) the worm 37 through the pinion 38.
  • the rotation of the worm 37 makes it possible to bring the partitions 31 and 33 closer or away from them as a function of the direction of rotation of the screw 37.
  • the two partitions 31 and 33 are favorably positioned symmetrically with respect to each other .
  • the two partitions 31 and 33 move transversely from front to back and vice versa (arrows C and S in Fig. 3), symmetrically relative to each other.
  • the box 1 1 comprises guiding means for each of the movable partitions 31 and 33.
  • These guide means may be of the type bars of guidance 41.
  • the bars 41 extend transversely through the compartment 16 substantially at the upstream and downstream side walls 17 and 18.
  • Four bars 41 are provided, with an upper upstream bar, an upstream lower bar, a downstream upper bar, a lower downstream bar .
  • a suction box 42 comprises the suction compartment 16, delimited by the two upstream and downstream side walls 17 and 18, the two longitudinal front walls and rear 19 and 21, and the bottom 22.
  • the housing 42 and the suction compartment 16 has an open upper face.
  • the box 42 with its compartment 16 is in communication with suction means 23.
  • suction means 23 In the center of the box 42, the compartment 16, and thus the central chamber 28, there is an opening 29 which is connected to the suction means 23 used to create the vacuum.
  • the two partitions used 31 and 33 are substantially similar to those of the first embodiment.
  • the box 42 comprises at the upper face a holding arrangement of the strip 6, comprising a first set of front rollers 43. These front rollers 43, for example five in number, are transverse, equidistant and parallel to each other.
  • the holding arrangement of the band 6 also comprises a first set of rear rollers 44. These rear rollers 44, for example five in number, are transverse, equidistant and parallel to each other.
  • the front rollers 43 and rear 44 are kept free to rotate through bearings.
  • the front rollers 43 are located in the continuity of the rear rollers 44.
  • the holding arrangement comprises three longitudinally disposed pads, a front pad 46, a center pad 47, and a rear pad 48.
  • the front rollers 43 are separated from the rear rollers 44 by the pads 46, 47, and 48.
  • the top edge these pads 46, 47 and 48 comes flush with the upper face of the compartment 16.
  • the band 6 moves while being held on the front and rear rollers 44 and 44.
  • the central part of the band 6 slides on the upper edge of these pads 46, 47 and 48.
  • the holding of the band 6 by the series of rollers 43 and 44 and the pads 46, 47 and 48 prevents the band 6 to vibrate, and consequently to disrupt the printing of the sheets by the printing units 2.
  • a box 1 1 can also be used in other parts of the printing machine 1, for example under printing units 2 or other modules.
  • a motor may be provided by partition 31 and 33 with actuating means (worm or other) specific to each engine torque-movable partition.

Landscapes

  • Delivering By Means Of Belts And Rollers (AREA)
  • Handling Of Sheets (AREA)
  • Ink Jet (AREA)

Abstract

A suction plenum, intended for a system for transporting flat supports (4) with at least one endless belt (6), formed with a collection of through-holes, in a support-printing machine (1) equipped with at least one printing unit (2), comprises suction means (23) able to generate a vacuum, and a suction compartment (16), divided into at least two distinct chambers (26, 27, 28), a first suction chamber (28) of variable volume, in communication with the suction means (23) so as to apply the vacuum through the holes in the belt (6) to the supports being transported by the belt (6), and a second chamber (26, 27) at ambient pressure, the first and second chamber (28, 26, 27) being separated from one another by a mobile partition (31, 33). The suction compartment (16) has an open upper face equipped with a holding arrangement (14, 43, 44, 46, 47, 48) allowing a movement of the belt (6).

Description

CAISSON D'ASPIRATION. SYSTƈME DE TRANSPORT DE SUPPORTS PLANS. ETĀ SUCTION BOX. TRANSPORT SYSTEM OF PLANAR SUPPORTS. AND
MACHINE D'IMPRESSION AINSI ƉQUIPƉE La prĆ©sente invention concerne un caisson d'aspiration pour un systĆØme de transport de supports plans dans une machine d'impression de supports plans. L'invention se rapporte Ć  un systĆØme de transport de supports plans comprenant au moins un caisson d'aspiration. L'invention se rapporte Ć©galement Ć  une machine d'impression de supports plans, Ć©quipĆ©e avec un systĆØme de transport de supports plans comprenant au moins un caisson d'aspiration. The present invention relates to a suction box for a planar media transport system in a planar media printing machine. The invention relates to a plane support transport system comprising at least one suction box. The invention also relates to a planar media printing machine, equipped with a planar media transport system comprising at least one suction box.
Une machine d'impression est utilisĆ©e dans l'industrie de l'emballage pour l'impression de supports plans, tels que des feuilles, ou un web de papier ou de carton. La machine comprend plusieurs stations successives. Une premiĆØre station situĆ©e la plus en amont est une station d'introduction introduisant successivement le support. La station d'introduction alimente plusieurs stations d'impression, sous la forme d'un ou de plusieurs groupes imprimeurs placĆ©s les uns Ć  la suite des autres. Chacun des groupes imprimeurs imprime une couleur spĆ©cifique avec une encre prĆ©sentant la coloration Ć©quivalente. La machine peut accepter facilement des formats diffĆ©rents de support. Une station de rĆ©ception qui collecte le support imprimĆ© avec une image est prĆ©vue en fin de machine. A printing machine is used in the packaging industry for printing flat media, such as sheets, or a web of paper or cardboard. The machine comprises several successive stations. A first station located furthest upstream is an introductory station successively introducing the support. The introductory station supplies several printing stations, in the form of one or more printing units placed one after the other. Each of the printing units prints a specific color with an ink having the equivalent coloring. The machine can easily accept different media formats. A receiving station which collects the printed medium with an image is provided at the end of the machine.
Dans le cas de l'impression de feuilles de carton, plus particuliĆØrement de carton ondulĆ©, la technologie la plus frĆ©quemment employĆ©e est l'impression en flexographie, avec utilisation de groupe flexo. L'impression digitale se dĆ©veloppe Ć©galement de plus en plus, avec utilisation de groupes imprimeurs munis de tĆŖtes d'impression digitales, par exemple de type jet d'encre. Cette technologie d'impression permet au fabriquant d'emballage de changer trĆØs rapidement de travail pour imprimer de nouvelles feuilles Ć  partir d'un fichier informatique reprĆ©sentatif de l'emballage. Ā In the case of printing cardboard sheets, more particularly corrugated cardboard, the most frequently used technology is flexographic printing, using flexo group. Digital printing is also developing more and more, with the use of printing units provided with digital printing heads, for example of inkjet type. This printing technology allows the packaging manufacturer to change jobs very quickly to print new sheets from a computer file representative of the package.
Les machines d'impression comprennent un ou plusieurs groupes imprimeurs, en fonction du nombre de couleurs souhaitĆ©es. Le support est dĆ©placĆ© longitudinalement de l'amont vers l'aval Ć  partir de la station d'introduction, vers les groupes imprimeurs, jusqu'Ć  la station de rĆ©ception. Pour obtenir une image finale de qualitĆ© sur le support imprimĆ©, il est notamment nĆ©cessaire que tous les points imprimĆ©s de couleurs diffĆ©rentes se posent exactement les uns Ć  cĆ“tĆ© des autres. Il est Ć©galement nĆ©cessaire que les points imprimĆ©s ne soient pas dĆ©formĆ©s. La qualitĆ© de l'impression obtenue sur le support plan dĆ©pend non seulement de la qualitĆ© des machines d'impression, de la qualitĆ© des encres utilisĆ©es, de la qualitĆ© des supports introduits, mais Ć©galement de la qualitĆ© et de la prĆ©cision du ou des systĆØmes de transport utilisĆ©s. The printing machines comprise one or more printing units, depending on the number of colors desired. The support is moved longitudinally from upstream to downstream from the introduction station, to the printing units, to the receiving station. To obtain a final image of quality on the printed medium, it is especially necessary that all the printed dots of different colors arise exactly next to each other. It is also necessary that the printed dots are not deformed. The quality of the printing obtained on the flat support depends not only on the quality of the printing machines, the quality of the inks used, the quality of the media introduced, but also the quality and precision of the system (s). used.
Le transport du support est assurĆ© par un systĆØme de transport vacuum utilisant soit un tapis, soit des courroies plates, soit des rouleaux en acier entraĆ®nĆ©s pour dĆ©placer le support longitudinalement d'un groupe imprimeur Ć  l'autre de l'amont vers l'aval, de la station d'introduction jusqu'Ć  la station de rĆ©ception. Pour obtenir une qualitĆ© d'impression optimale, l'un des principes de base est que le transport assure une vitesse du support la plus rĆ©guliĆØre possible. Un autre principe est que le support doit ĆŖtre maintenu le plus fermement possible et doit ĆŖtre parfaitement guidĆ© par le systĆØme de transport, afin de ne pas dĆ©vier lors l'impression par le ou les groupes imprimeurs ou entre le ou les groupes imprimeurs. Etat de la technique Ā The transport of the support is provided by a vacuum transport system using either a belt, flat belts, or driven steel rollers to move the support longitudinally from one printing unit to another from upstream to downstream from the introductory station to the receiving station. To get the best print quality, one of the basic principles is that transport ensures the most consistent media speed possible. Another principle is that the support must be maintained as firmly as possible and must be perfectly guided by the transport system, so as not to deviate during printing by the printing group (s) or between the printing group (s). State of the art
Le document US 6,471 ,430 dĆ©crit une machine d'impression de supports de type feuilles de papier ou de carton, comprenant un systĆØme de transport. Pour l'impression, les feuilles sont prises d'une alimentation en feuilles et transportĆ©es sur une premiĆØre bande de transport sans fin. Les feuilles sont maintenues au cours de leur transport grĆ¢ce Ć  un systĆØme d'aspiration et passent sous des premiers groupes imprimeurs et sous un premier sĆ©choir d'encre en aval des premiers groupes imprimeurs. Les feuilles sont ensuite retournĆ©es et sont transportĆ©es par une deuxiĆØme bande de transport sans fin sous des deuxiĆØmes groupes imprimeurs et sous un deuxiĆØme sĆ©choir d'encre pour ĆŖtre ensuite rĆ©cupĆ©rĆ©es dans une station de sortie. Ā US 6,471,430 discloses a paper or cardboard type media printing machine comprising a transport system. For printing, the sheets are taken from a sheet feed and transported on a first endless conveyor belt. The sheets are maintained during their transport by means of a suction system and pass under first printing units and under a first ink dryer downstream of the first printing units. The sheets are then returned and transported by a second endless conveyor belt under second printing units and under a second ink dryer for subsequent recovery at an output station.
Les bandes de transport sont rĆ©alisĆ©es avec une sĆ©rie de trous traversant pour permettre l'aspiration d'air et obtenir l'effet de maintien permettant le transport des feuilles dans la machine. Des caissons d'aspiration sont placĆ©s sous les bandes de faƧon Ć  gĆ©nĆ©rer le vide d'air. Ā The conveyor belts are made with a series of through-holes to allow the air to be drawn in and to obtain the holding effect for transporting the sheets into the machine. Suction boxes are placed under the strips so as to generate the vacuum of air.
Cependant, l'utilisation d'un systĆØme d'aspiration pour appliquer un vide d'air sous la bande de transport, et par ce biais plaquer les feuilles Ć  imprimer, prĆ©sente certains inconvĆ©nients. Le vide crĆ©Ć© se rĆ©percute au niveau des feuilles et plus prĆ©cisĆ©ment sur la position des feuilles guidĆ©es. Cela peut avoir une consĆ©quence sur le processus d'impression, car des flux d'air parasites sont gĆ©nĆ©rĆ©s au niveau des bords avant, arriĆØre et latĆ©raux des feuilles. Ā However, the use of a suction system to apply an air gap under the conveyor belt, and thereby to press the sheets to be printed, has certain drawbacks. The created vacuum is reflected in the leaves and more precisely in the position of the guided sheets. This can have an effect on the printing process, as spurious air streams are generated at the front, back, and side edges of the sheets.
Le vide d'air gĆ©nĆØre Ć©galement des perturbations au niveau des sĆ©choirs. En effet, ces sĆ©choirs comprennent une partie d'aspiration qui est nĆ©cessaire pour aspirer l'humiditĆ© gĆ©nĆ©rĆ©e lors du sĆ©chage. Afin d'effectuer un sĆ©chage optimal, l'aspiration se fait Ć  partir de la face imprimĆ©e des feuilles et vers le haut. Or, la prĆ©sence de deux vides d'air dans des directions opposĆ©es, Ć  la fois en dessous pour le maintien des feuilles sur la bande et au dessus pour le sĆ©chage des feuilles, va affecter la planĆ©itĆ© des feuilles et la prĆ©cision du transport. The air void also generates disturbances in the dryers. Indeed, these dryers include a suction part which is necessary to suck the moisture generated during drying. In order to achieve optimum drying, the suction is made from the printed side of the sheets and upwards. However, the presence of two air gaps in opposite directions, both underneath for holding the sheets on the web and above for drying the sheets, will affect the flatness of the sheets and the accuracy of the transport.
ExposƩ de l'invention Presentation of the invention
Un objectif principal de la prĆ©sente invention est de proposer un caisson d'aspiration destinĆ© Ć  un systĆØme de transport de supports plans dans une machine d'impression des supports plans. Un deuxiĆØme objectif est de prĆ©voir un caisson d'aspiration pour transporter des supports devant ĆŖtre imprimĆ©s qui assure une bonne tenue de ces supports sur la bande de transport du systĆØme de transport. Un troisiĆØme objectif est de mettre au point un caisson d'aspiration permettant de minimiser les pertes de charge lorsqu'un support est transportĆ©. Un quatriĆØme objectif est de rĆ©aliser un caisson prĆ©sentant des perturbations de la bande rĆ©duites au minimum. Un cinquiĆØme objectif est de d'adapter un systĆØme de transport Ć  bande sans fin pour imprimer des supports plans comprenant au moins un caisson d'aspiration. Un sixiĆØme objectif est de rĆ©soudre les problĆØmes techniques mentionnĆ©s pour les caissons et les systĆØmes de transport de l'Ć©tat de la technique. Un autre objectif encore est d'amĆ©liorer encore la qualitĆ© d'impression pour une machine d'impression de supports plans Ć©quipĆ©e avec au moins un groupe imprimeur. Ā A main object of the present invention is to provide a suction box for a planar media transport system in a planar media printing machine. A second objective is to provide a suction box for transporting media to be printed which ensures a good hold of these media on the conveyor belt of the transport system. A third objective is to develop a suction box to minimize losses when a carrier is transported. A fourth objective is to make a box with band disturbances reduced to a minimum. A fifth objective is to adapt an endless conveyor system for printing flat supports comprising at least one suction box. A sixth objective is to solve the technical problems mentioned for caissons and transport systems of the state of the art. Yet another object is to further improve the print quality for a flatbed printing machine equipped with at least one printing unit.
ConformĆ©ment Ć  un aspect de la prĆ©sente invention, un caisson d'aspiration, destinĆ© Ć  un systĆØme de transport de supports plans avec au moins une bande sans fin mĆ©nagĆ©e avec un ensemble de trous traversant, dans une machine d'impression des supports Ć©quipĆ©e avec au moins un groupe imprimeur, comprenant: In accordance with an aspect of the present invention, a suction box for a planar media transport system with at least one endless band formed with a set of through holes in a media printing machine equipped with less a printing group, comprising:
- des moyens d'aspiration, aptes Ć  gĆ©nĆ©rer un vide d'air, et Ā suction means capable of generating an air vacuum, and
- un compartiment d'aspiration, divisĆ© en au moins deux chambres distinctes une premiĆØre chambre d'aspiration avec un volume ajustable, en communication avec les moyens d'aspiration, pour appliquer Ć  travers les trous de la bande le vide d'air aux supports transportĆ©s par la bande, et Ā - a suction compartment, divided into at least two separate chambers a first suction chamber with an adjustable volume, in communication with the suction means, for applying through the holes of the strip the vacuum of air to the supports transported by the band, and
une deuxiĆØme chambre Ć  pression ambiante, Ā a second chamber at ambient pressure,
la premiĆØre et la deuxiĆØme chambre Ć©tant sĆ©parĆ©es l'un de l'autre par une cloison mobile. Le caisson d'aspiration est caractĆ©risĆ© en ce que le compartiment d'aspiration prĆ©sente une face supĆ©rieure ouverte munie d'un agencement de maintien, permettant un dĆ©placement de la bande. Autrement dit, la face supĆ©rieure ouverte du compartiment permet de transfĆ©rer directement le vide d'air Ć  la bande et ainsi aux supports plans. La bande est maintenue et circule au niveau de la face supĆ©rieure. the first and second chambers being separated from one another by a movable partition. The suction box is characterized in that the suction compartment has an open upper face provided with a holding arrangement, allowing movement of the band. In other words, the open upper surface of the compartment makes it possible to directly transfer the air vacuum to the strip and thus to the plane supports. The band is held and circulates at the upper face.
La chambre d'aspiration Ć  dimension ajustable permet d'ajuster facilement et simplement l'intensitĆ© du vide d'air appliquĆ©. La face au niveau de laquelle passe la bande prĆ©sente ainsi une zone d'aspiration variable, fonction des chambres ajustables. Ceci permet de maintenir une aspiration forte et optimale au niveau de la ou des zones d'aspiration, afin de conserver la planĆ©itĆ© des supports plans, l'absence de dĆ©placement des supports plans par rapport Ć  la bande de transport et donc la prĆ©cision du transport. Ā The dimensionally adjustable suction chamber makes it easy to adjust the intensity of the applied air vacuum. The face at which the strip passes thus has a variable suction zone, depending on the adjustable chambers. This makes it possible to maintain a strong and optimum suction at the suction zone or zones, in order to maintain the flatness of the flat supports, the absence of displacement of the flat supports with respect to the conveyor belt and thus the accuracy of the transport. .
La surface de cette zone varie par exemple en fonction du format des supports plans devant ĆŖtre transportĆ©s et imprimĆ©s. Le fonctionnement de la machine d'impression des supports va ĆŖtre optimal, le vide d'air Ć©tant appliquĆ© directement sous la bande de transport dont l'Ć©tendue est limitĆ©e Ć  la zone dans laquelle se trouve le support plan transportĆ©. Le format des chambres fournissant le vide d'air sous les supports transportĆ©s va ĆŖtre adaptĆ©, afin de ne pas perturber le fonctionnement des sĆ©choirs. Ā The surface of this area varies for example according to the format of the flat supports to be transported and printed. The operation of the media printing machine will be optimal, the air vacuum being applied directly under the conveyor belt whose extent is limited to the area in which the transported plane support is located. The size of the chambers providing the air space under the transported supports will be adapted, so as not to disturb the operation of the dryers.
Un support plan est dĆ©fini, Ć  titre d'exemple non exhaustif, comme Ć©tant en un matĆ©riau en feuille, en plaque, en bande continue tel que du papier, du carton plat, du carton ondulĆ©, du carton ondulĆ© contrecollĆ©, du plastique flexible, par exemple du polyĆ©thylĆØne (PE), du polyĆ©thylĆØne tĆ©rĆ©phtalate (PET), du polypropylĆØne biorientĆ© (BOPP), ou d'autres polymĆØres, ou d'autres matĆ©riaux encore. Le support plan est dĆ©fini, Ć  titre d'exemple non exhaustif, comme Ć©tant une feuille destinĆ©e Ć  former une dĆ©coupe, puis une boĆ®te d'emballage. Ā A planar support is defined, by way of non-exhaustive example, as a sheet, plate, continuous web material such as paper, cardboard, corrugated cardboard, laminated corrugated cardboard, flexible plastic, for example polyethylene (PE), polyethylene terephthalate (PET), bioriented polypropylene (BOPP), or other polymers, or other materials. The planar support is defined, by way of non-exhaustive example, as a sheet intended to form a blank, and then a packaging box.
La direction longitudinale est dĆ©finie par rĆ©fĆ©rence Ć  la trajectoire du support plan dans la machine d'impression, selon son axe longitudinal mĆ©dian. Les directions amont et aval sont dĆ©finies en faisant rĆ©fĆ©rence au sens de dĆ©placement selon la trajectoire du support, suivant la direction longitudinale dans l'ensemble de la machine d'impression. Ā The longitudinal direction is defined by reference to the trajectory of the plane support in the printing machine, according to its median longitudinal axis. The upstream and downstream directions are defined with reference to the direction of travel along the path of the support, in the longitudinal direction throughout the printing machine.
Dans un autre aspect de l'invention, un systĆØme de transport de supports plans avec au moins une bande sans fin mĆ©nagĆ©e avec un ensemble de trous traversant, dans une machine d'impression des supports Ć©quipĆ©e avec au moins un groupe imprimeur, comprend au moins un caisson d'aspiration prĆ©sentant une ou plusieurs caractĆ©ristiques techniques dĆ©crites ci-dessous et revendiquĆ©es. In another aspect of the invention, a planar media transport system with at least one endless belt formed with a set of through holes, in a media printing machine equipped with at least one group. printer, comprises at least one suction box having one or more technical characteristics described below and claimed.
Dans un autre aspect de l'invention, une machine d'impression de supports plans, Ć©quipĆ©e avec au moins un groupe imprimeur, comprend un systĆØme de transport des supports, comprenant au moins un caisson d'aspiration prĆ©sentant une ou plusieurs caractĆ©ristiques techniques dĆ©crites ci-dessous et revendiquĆ©es. Ā In another aspect of the invention, a flat media printing machine, equipped with at least one printing unit, comprises a media transport system, comprising at least one suction box having one or more technical features described herein. below and claimed.
Selon un autre aspect encore de l'invention, une machine d'impression de supports plans, Ć©quipĆ©e avec au moins un groupe imprimeur, comprend un systĆØme de transport des supports prĆ©sentant une ou plusieurs caractĆ©ristiques techniques dĆ©crites ci-dessous et revendiquĆ©es. Ā According to yet another aspect of the invention, a flat media printing machine, equipped with at least one printing unit, comprises a media transport system having one or more technical features described below and claimed.
BrĆØve description des dessins Brief description of the drawings
L'invention sera bien comprise et ses divers avantages et diffĆ©rentes caractĆ©ristiques ressortiront mieux lors de la description suivante, de l'exemple non limitatif de rĆ©alisation, en rĆ©fĆ©rence aux dessins schĆ©matiques annexĆ©s, dans lesquels: Ā The invention will be better understood and its various advantages and different characteristics will become more apparent in the following description, of the nonlimiting exemplary embodiment, with reference to the appended diagrammatic drawings, in which:
- la Figure 1 reprĆ©sente une vue en perspective d'une machine d'impression, comprenant un systĆØme de transport et des caissons d'aspiration selon l'invention; Ā - Figure 1 shows a perspective view of a printing machine, comprising a transport system and suction boxes according to the invention;
- les Figures 2 Ć  5 reprĆ©sentent chacune respectivement une vue latĆ©rale, du dessus, de dessus en perspective aval et de dessus en perspective amont d'un caisson d'aspiration selon un premier mode de rĆ©alisation de l'invention; et Ā - Figures 2 to 5 respectively show a side view from above, from above in perspective downstream and from above upstream perspective of a suction box according to a first embodiment of the invention; and
- la Figure 6 reprĆ©sente une vue de dessus en perspective amont d'un caisson d'aspiration selon un deuxiĆØme mode de rĆ©alisation de l'invention. Ā - Figure 6 shows a top view in perspective upstream of a suction box according to a second embodiment of the invention.
ExposƩ dƩtaillƩ de modes de rƩalisation prƩfƩrƩs Detailed description of preferred embodiments
Comme l'illustre la Figure 1 , une machine d'impression 1 est utilisĆ©e pour imprimer des supports de type Ć©lĆ©ments en plaque, par exemple des feuilles en carton ondulĆ©. A titre d'exemple principal de rĆ©alisation, la machine 1 est une machine d'impression digitale, qui reprend par exemple certains Ć©lĆ©ments constitutifs dĆ©crits dans le document US 6,471 ,430. La machine 1 comprend notamment un ensemble de quatre groupes imprimeurs 2, disposĆ©s en ligne les uns Ć  la suite des autres. Ā As illustrated in Figure 1, a printing machine 1 is used to print plate-like media, for example corrugated sheets. As a main example of embodiment, the machine 1 is a digital printing machine, which includes for example some constituent elements described in US 6,471, 430. The machine 1 comprises in particular a set of four printer groups 2, arranged in line one after the other.
Chacun des groupes imprimeurs 2 est muni d'au moins une tĆŖte d'impression digitale, sans contact par exemple Ć  jet d'encre. A titre d'exemple, un jeu de tĆŖtes est orientĆ© vers le bas, la face supĆ©rieure des feuilles transportĆ©es par la bande 6 Ć©tant alors imprimĆ©e. Les encres noir, cyan, magenta et jaune sont successivement imprimĆ©es par les groupes imprimeurs 2 sur les feuilles. Each of the printing units 2 is provided with at least one digital printing head, without contact for example ink jet. For example, a set of heads is oriented downwards, the upper face of the sheets transported by the strip 6 is then printed. The inks black, cyan, magenta and yellow are successively printed by the printer groups 2 on the sheets.
Les feuilles sont introduites (FlĆØches F en Fig. 1 ) par une station d'alimentation (non reprĆ©sentĆ©e), montĆ©e en amont de la machine d'impression 1 (non reprĆ©sentĆ©e). Les feuilles sont ensuite saisies, transportĆ©es, circulent longitudinalement F, et sortent F imprimĆ©es au niveau d'une station de rĆ©ception (non reprĆ©sentĆ©e), montĆ©e en aval de la machine d'impression 1 . Deux sĆ©choirs 3, avec des tubulures d'Ć©vacuation de vapeur d'eau, sont placĆ©s en aval des groupes imprimeurs 2. Ā The sheets are fed (arrows F in Fig. 1) by a feed station (not shown) mounted upstream of the printing machine 1 (not shown). The sheets are then seized, transported, move longitudinally F, and leave F printed at a receiving station (not shown), mounted downstream of the printing machine 1. Two dryers 3, with steam evacuation pipes, are placed downstream of the printing units 2.
Les feuilles devant ĆŖtre imprimĆ©es sont transportĆ©es de l'amont vers l'aval par un systĆØme de transport 4. Le systĆØme de transport 4 comprend au moins un tapis ou une bande, dans ce cas une seule bande mĆ©tallique sans fin 6, qui est montĆ©e entre un premier cylindre amont 7 et un deuxiĆØme cylindre aval 8. La bande sans fin 6 est mĆ©nagĆ©e avec un ensemble de trous traversant (non visibles en Fig. 1 ). Au moins l'un des deux cylindres 7 et 8 est entraĆ®nĆ© en rotation (FlĆØche R en Fig. 1 ) au moyen d'un moteur 9, ce qui entraĆ®ne la bande 6. Les cylindres 7 et 8 et la bande 6 sont montĆ©s sur un chĆ¢ssis 10. Ā The sheets to be printed are conveyed from upstream to downstream by a transport system 4. The transport system 4 comprises at least one carpet or belt, in this case a single endless metal band 6, which is mounted between an upstream first cylinder 7 and a second downstream cylinder 8. The endless belt 6 is formed with a set of through holes (not visible in Fig. 1). At least one of the two cylinders 7 and 8 is rotated (arrow R in Fig. 1) by means of a motor 9, which causes the strip 6. The cylinders 7 and 8 and the strip 6 are mounted on a chassis 10.
Les feuilles restent plaquĆ©es sur la bande 6, grĆ¢ce Ć  des caissons d'aspiration Ć©galement appelĆ© caissons vacuum 1 1 , et passent sous les groupes imprimeurs 2 et sĆ©choirs 3. Seuls les caissons vacuum 1 1 en amont des groupes imprimeurs 2, entre les groupes imprimeurs 2, et en aval des groupes imprimeurs 2 ont Ć©tĆ© reprĆ©sentĆ©s en traits tillĆ©s en Fig. 1 . Ā The sheets remain plated on the strip 6, thanks to suction boxes also called vacuum boxes 1 1, and pass under the printer groups 2 and dryers 3. Only vacuum boxes 1 1 upstream of the printer groups 2, between the groups printers 2, and downstream of printing units 2 have been shown in dotted lines in FIG. 1.
Pour favoriser l'accroche et la tenue des encres qui vont ĆŖtre dĆ©posĆ©es par impression sur les feuilles de carton devant ĆŖtre imprimĆ©es, la machine d'impression 1 comprend favorablement un groupe d'enduction amont 12. Ce groupe d'enduction amont 12 est disposĆ© en amont du premier groupe imprimeur 2, juste aprĆØs la station d'alimentation. Le groupe d'enduction amont 12 est placĆ© au droit du cylindre amont 7. Pour faire sĆ©cher l'enduction, un sĆ©choir 3 peut ĆŖtre intercalĆ© entre le groupe d'enduction amont 12 et le premier groupe imprimeur 2. Ā In order to promote the grip and holding of the inks which will be deposited by printing on the sheets of cardboard to be printed, the printing machine 1 advantageously comprises an upstream coating group 12. This upstream coating group 12 is arranged upstream of the first printer group 2, just after the feed station. The upstream coating unit 12 is placed in line with the upstream cylinder 7. In order to dry the coating, a dryer 3 may be inserted between the upstream coating unit 12 and the first printing unit 2.
Pour favoriser la tenue et la protection des encres qui sont dĆ©posĆ©es par impression sur les feuilles de carton venant d'ĆŖtre imprimĆ©es, la machine d'impression 1 comprend favorablement un groupe d'enduction aval 13. Ce groupe d'enduction aval 9 est disposĆ© en aval du dernier groupe imprimeur 2, et en aval des sĆ©choirs 3, juste avant la station de rĆ©ception. Le groupe d'enduction aval 13 est placĆ© au droit du cylindre aval 8. Ā In order to favor the holding and the protection of the inks which are deposited by printing on the cardboard sheets which have just been printed, the printing machine 1 advantageously includes a downstream coating group 13. This downstream coating group 9 is arranged downstream of the last printer group 2, and downstream of the dryers 3, just before the receiving station. The downstream coating group 13 is placed in line with the downstream cylinder 8.
Sept caissons d'aspiration 1 1 sont montĆ©s sur le chĆ¢ssis 10 sous la bande 6. Les caissons 1 1 se trouvent situĆ©s entre la partie supĆ©rieure de la bande 6 qui transporte les feuilles et la partie infĆ©rieure de la bande 6 qui fait le retour. Chaque caisson d'aspiration 1 1 comprend une face supĆ©rieure, orientĆ©e en direction de la face infĆ©rieure de la bande 6, les feuilles Ć©tant plaquĆ©e sur la face infĆ©rieure de la bande 6. La bande 6 passe au niveau de la face supĆ©rieure. Chacun des sĆ©choirs 3 est associĆ© Ć  un caisson d'aspiration 1 1 . Chaque intervalle entre les groupes imprimeurs 2 est associĆ© Ć  un caisson d'aspiration 1 1 . Seven suction boxes 1 1 are mounted on the frame 10 under the strip 6. The boxes 1 1 are located between the upper part of the strip 6 which carries the sheets and the lower part of the strip 6 which returns. Each box suction 1 1 comprises an upper face, oriented towards the lower face of the strip 6, the sheets being plated on the lower face of the strip 6. The strip 6 passes at the upper face. Each of the dryers 3 is associated with a suction box 1 1. Each interval between the printing units 2 is associated with a suction box January 1.
Le caisson 1 1 selon un premier mode de rĆ©alisation comprend au niveau de la face supĆ©rieure un agencement de maintien de la bande 6 comprenant une sĆ©rie de rouleaux transversaux, Ć©quidistants et parallĆØles entre eux 14 (Figs. 2, 3, 4 et 5). Par souci de clartĆ©, le rouleau central 14 a Ć©tĆ© enlevĆ© pour le caisson 1 1 reprĆ©sentĆ© en Fig. 3. Les rouleaux 14 sont maintenus libres de tourner grĆ¢ce Ć  des paliers. Les rouleaux 14 viennent Ć  fleur de la face supĆ©rieure du compartiment 16. La bande 6 se dĆ©place sur les rouleaux 14, ce qui limite les frottements et les vibrations. Ā The box 1 1 according to a first embodiment comprises at the upper face a holding arrangement of the strip 6 comprising a series of transverse rollers, equidistant and parallel to each other 14 (Figs 2, 3, 4 and 5). For the sake of clarity, the central roller 14 has been removed for the box 1 1 shown in FIG. 3. The rollers 14 are kept free to rotate by bearings. The rollers 14 are flush with the upper face of the compartment 16. The band 6 moves on the rollers 14, which limits the friction and vibrations.
Le caisson d'aspiration 1 1 comprend (Figs. 2 et 3) un compartiment d'aspiration 16, dĆ©limitĆ© par deux parois latĆ©rales amont et aval 17 et 18, deux parois longitudinales avant et arriĆØre 19 et 21 , et un fond 22. Par souci de clartĆ©, la paroi avant 19 a Ć©tĆ© enlevĆ©e pour le caisson 1 1 reprĆ©sentĆ© en Fig. 4. Le caisson 1 1 avec le compartiment d'aspiration 16 prĆ©sente une face supĆ©rieure ouverte. Ā The suction box 1 1 comprises (Figs 2 and 3) a suction compartment 16, delimited by two upstream and downstream sidewalls 17 and 18, two longitudinal front and rear walls 19 and 21, and a bottom 22. By For the sake of clarity, the front wall 19 has been removed for the box 1 1 shown in FIG. 4. The box 1 1 with the suction compartment 16 has an open upper face.
Le caisson 1 1 avec son compartiment 16 est en communication avec des moyens d'aspiration 23 comprenant par exemple un moteur 24 aptes Ć  gĆ©nĆ©rer un vide d'air dans le compartiment 16. Ā The box 1 1 with its compartment 16 is in communication with suction means 23 comprising for example a motor 24 able to generate an air gap in the compartment 16.
Selon l'invention, le compartiment 16 est divisĆ© en au moins deux chambres, dans ce cas trois chambres 26, 27 et 28. Une deuxiĆØme chambre avant 26 et une deuxiĆØme chambre arriĆØre 27 entourent une premiĆØre chambre d'aspiration centrale 28. La chambre centrale 28 est ajustable et prĆ©sente une contenance variable choisie par l'opĆ©rateur. Les deux chambres avant et arriĆØre 26 et 27 restent Ć  pression ambiante. Ā According to the invention, the compartment 16 is divided into at least two chambers, in this case three chambers 26, 27 and 28. A second front chamber 26 and a second rear chamber 27 surround a first central aspiration chamber 28. The chamber Central 28 is adjustable and has a variable capacity selected by the operator. The two front and rear chambers 26 and 27 remain at ambient pressure.
La chambre centrale 28 est en communication avec les moyens d'aspiration 23, pour appliquer Ć  travers les trous de la bande 6 le vide d'air aux supports transportĆ©s par la bande 6. Au centre du caisson 1 1 , du compartiment 16, et ainsi de la chambre centrale 28, se trouve une ouverture 29 qui est liĆ©e aux moyens d'aspiration 23 utilisĆ© pour crĆ©er le vide d'air. Ā The central chamber 28 is in communication with the suction means 23, for applying through the holes of the strip 6 the vacuum of air to the supports carried by the strip 6. In the center of the box 1 1, the compartment 16, and thus of the central chamber 28, there is an opening 29 which is connected to the suction means 23 used to create the vacuum of air.
La chambre centrale 28 est dĆ©limitĆ©e par deux cloisons mobiles 31 et 33. Une cloison mobile avant 31 sĆ©pare la deuxiĆØme chambre avant 26 de la premiĆØre chambre 28 central. Une cloison mobile arriĆØre 33 sĆ©pare la deuxiĆØme chambre arriĆØre 27 de la premiĆØre chambre 28 centrale. Le caisson d'aspiration 1 1 s'ajuste au format de la feuille transportĆ©e. Des joints ou bavettes souples en plastique (non visibles) assurent l'Ć©tanchĆ©itĆ© de la chambre centrale 28 en venant frotter contre les parois latĆ©rales amont et aval 17 et 18 et contre le fond 22. The central chamber 28 is delimited by two movable partitions 31 and 33. A movable partition before 31 separates the second front chamber 26 of the first central chamber 28. A rear movable partition 33 separates the second rear chamber 27 from the first central chamber 28. The suction box January 1 fits the size of the sheet transported. Soft plastic seals or flaps (not visible) ensure sealing the central chamber 28 by rubbing against the upstream and downstream side walls 17 and 18 and against the bottom 22.
De maniĆØre prĆ©fĆ©rentielle, la chambre centrale 28 et les chambres Ć  pression ambiante 26 et 27 sont orientĆ©s longitudinalement, les cloisons mobiles 31 et 33 Ć©tant globalement orientĆ©s longitudinalement de l'amont vers l'aval. Ā Preferably, the central chamber 28 and the ambient pressure chambers 26 and 27 are oriented longitudinally, the movable partitions 31 and 33 being generally oriented longitudinally from upstream to downstream.
Les cloisons mobiles 31 et 33 sont divergentes entre-elles, en Ć©tant avantageusement inclinĆ©es l'une par rapport Ć  l'autre. Comme cela est visible en Fig. 3, les cloisons 31 et 33 sont favorablement inclinĆ©es l'une Ć  l'autre (angles a1 ) par rapport Ć  un plan vertical longitudinal mĆ©dian passant par l'axe longitudinal mĆ©dian L du caisson 1 1 et de la machine 1 . Dans une telle configuration, il devient impossible de fermer complĆØtement la chambre centrale 28 entre les deux cloisons mobiles 31 et 33. Les cloisons ont une configuration orientĆ©e en V vue de dessus, lorsqu'elles sont proches l'une de l'autre ce qui permet d'Ć©viter l'obturation de l'ouverture 29 des moyens d'aspiration 23. Ā The movable partitions 31 and 33 are divergent from each other, advantageously being inclined with respect to each other. As can be seen in FIG. 3, the partitions 31 and 33 are favorably inclined to each other (angles a1) with respect to a median longitudinal vertical plane passing through the median longitudinal axis L of the box 1 1 and the machine 1. In such a configuration, it becomes impossible to completely close the central chamber 28 between the two movable partitions 31 and 33. The partitions have a configuration oriented in a V view from above, when they are close to each other which prevents clogging of the opening 29 of the suction means 23.
Le caisson 1 1 comprend de maniĆØre favorable des moyens d'actionnement 34 pour les deux cloisons mobiles 31 et 33 (voir Figs. 2 et 4). Les moyens d'actionnement 34 comprennent prĆ©fĆ©rentiellement au moins un moteur, dans ce cas un seul moteurĀ The casing 11 advantageously comprises actuating means 34 for the two movable partitions 31 and 33 (see Figs 2 and 4). The actuating means 34 preferably comprise at least one motor, in this case a single motor
36 actionnant et dĆ©plaƧant les deux cloisons 31 et 33 par translation. Le moteur 36 est installĆ© dans un logement situĆ© derriĆØre la paroi avant 19. Ce logement est particuliĆØrement avantageux, car il permet l'ajout du moteur 36 Ć  l'intĆ©rieur du volume du caisson d'aspiration 1 1 , plutĆ“t qu'Ć  l'extĆ©rieur de celui-ci. 36 actuating and moving the two partitions 31 and 33 by translation. The motor 36 is installed in a housing located behind the front wall 19. This housing is particularly advantageous because it allows the addition of the motor 36 inside the volume of the suction box 1 1, rather than the outside of it.
Les moyens d'actionnement 34 peuvent comprendre une vis sans fin 37. La visĀ The actuating means 34 may comprise a worm 37. The screw
37 se dĆ©ploie transversalement Ć  travers le compartiment 16 sensiblement dans son centre. La vis 37 est maintenue en rotation grĆ¢ce Ć  des paliers. La vis 37 traverse chacune des deux cloisons mobiles 31 et 33 Ć  l'aide d'une piĆØce formant coulisseau. 37 extends transversely through the compartment 16 substantially in its center. The screw 37 is kept rotated by bearings. The screw 37 passes through each of the two movable partitions 31 and 33 with the aid of a slider piece.
Un pignon 38 est fixĆ© Ć  la vis sans fin 37 au niveau de son extrĆ©mitĆ© avant. Le moteur 36 est mĆ©caniquement connectĆ© Ć  un moyen d'entraĆ®nement comme une chaĆ®ne ou une courroie 39, qui fait tourner (FlĆØches A et B en Fig. 2) la vis sans fin 37 par l'intermĆ©diaire du pignon 38. Ā A pinion 38 is fixed to the worm 37 at its front end. The motor 36 is mechanically connected to a drive means such as a chain or belt 39, which rotates (arrows A and B in Fig. 2) the worm 37 through the pinion 38.
La rotation de la vis sans fin 37 permet de rapprocher les cloisons 31 et 33 ou de les Ć©loigner en fonction du sens de rotation de la vis 37. Les deux cloisons 31 et 33 sont favorablement positionnĆ©es symĆ©triquement l'une par rapport Ć  l'autre. Les deux cloisons 31 et 33 se dĆ©placent transversalement d'avant en arriĆØre et inversement (FlĆØches C et S en Fig. 3), symĆ©triquement l'une par rapport Ć  l'autre. Ā The rotation of the worm 37 makes it possible to bring the partitions 31 and 33 closer or away from them as a function of the direction of rotation of the screw 37. The two partitions 31 and 33 are favorably positioned symmetrically with respect to each other . The two partitions 31 and 33 move transversely from front to back and vice versa (arrows C and S in Fig. 3), symmetrically relative to each other.
De prĆ©fĆ©rence, le caisson 1 1 comprend des moyens de guidage de chacune des cloisons mobiles 31 et 33. Ces moyens de guidage peuvent ĆŖtre du type barres de guidage 41 . Les barres 41 se dĆ©ploient transversalement Ć  travers le compartiment 16 sensiblement au niveau des parois latĆ©rales amont et aval 17 et 18. Quatre barres 41 sont prĆ©vues, avec une barre supĆ©rieure amont, une barre infĆ©rieure amont, une barre supĆ©rieure aval, une barre infĆ©rieure aval. Preferably, the box 1 1 comprises guiding means for each of the movable partitions 31 and 33. These guide means may be of the type bars of guidance 41. The bars 41 extend transversely through the compartment 16 substantially at the upstream and downstream side walls 17 and 18. Four bars 41 are provided, with an upper upstream bar, an upstream lower bar, a downstream upper bar, a lower downstream bar .
Dans une deuxiĆØme mode de rĆ©alisation de l'invention (voir Fig. 6), un caisson d'aspiration 42 comprend le compartiment d'aspiration 16, dĆ©limitĆ© par les deux parois latĆ©rales amont et aval 17 et 18, les deux parois longitudinales avant et arriĆØre 19 et 21 , et le fond 22. Le caisson 42 et le compartiment d'aspiration 16 prĆ©sente une face supĆ©rieure ouverte. Ā In a second embodiment of the invention (see Fig. 6), a suction box 42 comprises the suction compartment 16, delimited by the two upstream and downstream side walls 17 and 18, the two longitudinal front walls and rear 19 and 21, and the bottom 22. The housing 42 and the suction compartment 16 has an open upper face.
Le caisson 42 avec son compartiment 16 est en communication avec des moyens d'aspiration 23. Au centre du caisson 42, du compartiment 16, et ainsi de la chambre centrale 28, se trouve une ouverture 29 qui est liĆ©e aux moyens d'aspiration 23 utilisĆ© pour crĆ©er le vide d'air. Les deux cloisons utilisĆ©es 31 et 33 sont sensiblement analogues Ć  celles du premier mode de rĆ©alisation. Ā The box 42 with its compartment 16 is in communication with suction means 23. In the center of the box 42, the compartment 16, and thus the central chamber 28, there is an opening 29 which is connected to the suction means 23 used to create the vacuum. The two partitions used 31 and 33 are substantially similar to those of the first embodiment.
Le caisson 42 selon le deuxiĆØme mode de rĆ©alisation comprend au niveau de la face supĆ©rieure un agencement de maintien de la bande 6, comprenant une premiĆØre sĆ©rie de rouleaux avant 43. Ces rouleaux avant 43, par exemple au nombre de cinq, sont transversaux, Ć©quidistants et parallĆØles entre eux. L'agencement de maintien de la bande 6 comprend Ć©galement une premiĆØre sĆ©rie de rouleaux arriĆØre 44. Ces rouleaux arriĆØre 44, par exemple au nombre de cinq, sont transversaux, Ć©quidistants et parallĆØles entre eux. Les rouleaux avant 43 et arriĆØre 44 sont maintenus libres de tourner grĆ¢ce Ć  des paliers. Les rouleaux avant 43 sont situĆ©s dans la continuitĆ© des rouleaux arriĆØre 44. Ā The box 42 according to the second embodiment comprises at the upper face a holding arrangement of the strip 6, comprising a first set of front rollers 43. These front rollers 43, for example five in number, are transverse, equidistant and parallel to each other. The holding arrangement of the band 6 also comprises a first set of rear rollers 44. These rear rollers 44, for example five in number, are transverse, equidistant and parallel to each other. The front rollers 43 and rear 44 are kept free to rotate through bearings. The front rollers 43 are located in the continuity of the rear rollers 44.
L'agencement de maintien comprend trois patins, disposĆ©s longitudinalement, un patin avant 46, un patin central 47 et un patin arriĆØre 48. Les rouleaux avant 43 sont sĆ©parĆ©s des rouleaux arriĆØre 44 par les patins 46, 47 et 48. L'arĆŖte supĆ©rieure de ces patins 46, 47 et 48 vient Ć  fleur de la face supĆ©rieure du compartiment 16. Ā The holding arrangement comprises three longitudinally disposed pads, a front pad 46, a center pad 47, and a rear pad 48. The front rollers 43 are separated from the rear rollers 44 by the pads 46, 47, and 48. The top edge these pads 46, 47 and 48 comes flush with the upper face of the compartment 16.
La bande 6 se dĆ©place en Ć©tant maintenue sur les rouleaux avant 43 et arriĆØre 44. La partie centrale de la bande 6 glisse sur l'arĆŖte supĆ©rieure de ces patins 46, 47 et 48. Le maintien de la bande 6 par les sĆ©ries de rouleaux 43 et 44 et par les patins 46, 47 et 48 permet d'Ć©viter Ć  la bande 6 de vibrer, et par voie de consĆ©quence de perturber l'impression des feuilles par les groupes imprimeurs 2. Ā The band 6 moves while being held on the front and rear rollers 44 and 44. The central part of the band 6 slides on the upper edge of these pads 46, 47 and 48. The holding of the band 6 by the series of rollers 43 and 44 and the pads 46, 47 and 48 prevents the band 6 to vibrate, and consequently to disrupt the printing of the sheets by the printing units 2.
La prĆ©sente invention n'est pas limitĆ©e aux modes de rĆ©alisation dĆ©crits et illustrĆ©s. De nombreuses modifications peuvent ĆŖtre rĆ©alisĆ©es, sans pour autant sortir du cadre dĆ©fini par la portĆ©e du jeu de revendications. On peut aussi utiliser un tel caisson 1 1 dans d'autres parties de la machine d'impression 1 , par exemple sous les groupes imprimeurs 2 ou d'autres modules. Alternativement, un moteur peut ĆŖtre prĆ©vu par cloison 31 et 33 avec des moyens d'actionnement (vis sans fin ou autre) propre Ć  chaque couple moteur-cloison mobile. The present invention is not limited to the embodiments described and illustrated. Many modifications can be made, without departing from the scope defined by the scope of the set of claims. Such a box 1 1 can also be used in other parts of the printing machine 1, for example under printing units 2 or other modules. Alternatively, a motor may be provided by partition 31 and 33 with actuating means (worm or other) specific to each engine torque-movable partition.

Claims

REVENDICATIONS
Caisson d'aspiration, destinĆ© Ć  un systĆØme de transport de supports plans (4) avec au moins une bande sans fin (6) mĆ©nagĆ©e avec un ensemble de trous traversant, dans une machine d'impression des supports (1 ) Ć©quipĆ©e avec au moins un groupe imprimeur (2), comprenant: Suction box, for a planar support conveyor system (4) with at least one endless band (6) formed with a set of through-holes, in a media printing machine (1) equipped with at least one a printing unit (2), comprising:
- des moyens d'aspiration (23), aptes Ć  gĆ©nĆ©rer un vide d'air, et Ā - suction means (23), able to generate an air vacuum, and
- un compartiment d'aspiration (16), divisĆ© en au moins deux chambres distinctes (26, 27, 28) Ā - a suction compartment (16), divided into at least two separate chambers (26, 27, 28)
une premiĆØre chambre d'aspiration avec un volume ajustable (28), en communication avec les moyens d'aspiration (23), pour appliquer Ć  travers les trous de la bande (6) le vide d'air aux supports transportĆ©s par la bande (6), et une deuxiĆØme chambre Ć  pression ambiante (26, 27), Ā a first suction chamber with an adjustable volume (28), in communication with the suction means (23), for applying through the holes of the strip (6) the vacuum of air to the carriers carried by the strip ( 6), and a second ambient pressure chamber (26, 27),
la premiĆØre et la deuxiĆØme chambre (28, 26, 27) Ć©tant sĆ©parĆ©es l'un de l'autre par une cloison mobile (31 , 33), Ā the first and second chambers (28, 26, 27) being separated from one another by a movable partition (31, 33),
caractĆ©risĆ© en ce que le compartiment d'aspiration (16) prĆ©sente une face supĆ©rieure ouverte munie d'un agencement de maintien (14, 43, 44, 46, 47, 48), permettant un dĆ©placement de la bande (6). Ā characterized in that the suction compartment (16) has an open upper face provided with a holding arrangement (14, 43, 44, 46, 47, 48), allowing movement of the band (6).
Caisson selon la revendication 1 , dans lequel l'agencement de maintien comprend au moins un rouleau (14, 43, 44). Box according to claim 1, wherein the holding arrangement comprises at least one roller (14, 43, 44).
Caisson selon la revendication 1 ou 2, dans lequel l'agencement de maintien comprend au moins un patin (46, 47, 48). Casing according to claim 1 or 2, wherein the holding arrangement comprises at least one pad (46, 47, 48).
Caisson selon l'une des revendications prƩcƩdentes, comprenant une chambre d'aspiration centrale (28) et deux chambres Ơ pression ambiante (26, 27), la chambre d'aspiration (28) Ʃtant dƩlimitƩ par deux cloisons mobiles (31 , 33). Box according to one of the preceding claims, comprising a central suction chamber (28) and two ambient pressure chambers (26, 27), the suction chamber (28) being delimited by two movable partitions (31, 33). .
Caisson selon l'une des revendications prƩcƩdentes, comprenant des moyens d'actionnement (34) de la cloison (31 , 33), avec au moins un moteur (36) et une vis sans fin (37). Casing according to one of the preceding claims, comprising actuating means (34) of the partition (31, 33), with at least one motor (36) and a worm (37).
Caisson selon l'une des revendications prƩcƩdentes, comprenant des moyens de guidage (41 ) de la cloison (31 , 33). Casing according to one of the preceding claims, comprising guide means (41) of the partition (31, 33).
7. Caisson selon l'une des revendications 4 Ơ 6, dans lequel les deux cloisons (31 , 33) sont positionnƩes et se dƩplacent symƩtriquement l'une par rapport Ơ l'autre. 7. Housing according to one of claims 4 to 6, wherein the two partitions (31, 33) are positioned and move symmetrically relative to each other.
8. Caisson selon l'une des revendications prƩcƩdentes, dans lequel la chambre d'aspiration (28) et la chambre Ơ pression ambiante (26, 27) sont orientƩs longitudinalement. 9. Caisson selon l'une des revendications 4 Ơ 8, dans lequel les cloisons (31 , 33) sont inclinƩes (a1 ) l'une Ơ l'autre par rapport Ơ un plan vertical longitudinal mƩdian. 8. Housing according to one of the preceding claims, wherein the suction chamber (28) and the ambient pressure chamber (26, 27) are oriented longitudinally. 9. Housing according to one of claims 4 to 8, wherein the partitions (31, 33) are inclined (a1) to each other with respect to a median longitudinal vertical plane.
SystĆØme de transport de supports plans avec au moins une bande sans fin (6) mĆ©nagĆ©e avec un ensemble de trous traversant, dans une machine d'impression des supports (1 ) Ć©quipĆ©e avec au moins un groupe imprimeur (2), comprenant au moins un caisson d'aspiration (1 1 ) selon l'une des revendications prĆ©cĆ©dentes. Planar support transport system with at least one endless belt (6) formed with a set of through-holes, in a media printing machine (1) equipped with at least one printing unit (2), comprising at least one suction box (1 1) according to one of the preceding claims.
SystĆØme selon la revendication 10, dans lequel la bande (6) est montĆ©e entre un premier et un deuxiĆØme cylindres (7, 8), entraĆ®nĆ©s en rotation par au moins un moteur d'entraĆ®nement (9), et entraĆ®nant la bande (6) dans le sens de transport (F). System according to Claim 10, in which the strip (6) is mounted between a first and a second cylinder (7, 8) driven in rotation by at least one drive motor (9) and driving the strip (6). in the direction of transport (F).
Machine d'impression de supports plans, Ć©quipĆ©e avec au moins un groupe imprimeur (2), comprenant un systĆØme de transport des supports (4), selon la revendication 10 ou 1 1 . Flatbed printing machine, equipped with at least one printing unit (2), comprising a carrier transport system (4), according to claim 10 or 11.
Machine d'impression de supports plans, Ć©quipĆ©e avec au moins un groupe imprimeur (2), comprenant un systĆØme de transport des supports (4), comprenant au moins un caisson d'aspiration selon l'une des revendications 1 Ć  Flatbed printing machine, equipped with at least one printing unit (2), comprising a carrier transport system (4), comprising at least one suction box according to one of claims 1 to
14. Machine selon la revendication 12 ou 13, comprenant un sƩchoir (3) associƩ Ơ un caisson d'aspiration (1 1 ). 14. Machine according to claim 12 or 13, comprising a dryer (3) associated with a suction box (1 1).
15. Machine selon l'une des revendications 12 Ć  14, dans laquelle le groupe imprimeur (2) est muni d'au moins une tĆŖte d'impression digitale. 15. Machine according to one of claims 12 to 14, wherein the printing unit (2) is provided with at least one digital print head.
EP15737990.0A 2014-07-18 2015-07-15 Suction box, system for transporting flat supports, and printing machine provided therewith Active EP3169528B1 (en)

Applications Claiming Priority (2)

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PCT/EP2015/025049 WO2016008596A1 (en) 2014-07-18 2015-07-15 Suction plenum, system for transporting flat supports, and printing machine thus equipped

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US3527166A (en) * 1968-06-06 1970-09-08 Matthew L Jaffa Vacuum table system for printing machine
DE19735070C2 (en) 1997-08-13 2001-09-06 Advanced Photonics Tech Ag Plant for creating sheet-like printed products
JP2005096135A (en) * 2003-09-22 2005-04-14 Fuji Photo Film Co Ltd Carrying apparatus for recording medium and image forming apparatus
US8353591B2 (en) * 2006-04-20 2013-01-15 Kabushiki Kaisha Isowa Apparatus and method for printing corrugated cardboard sheets
JP2008000526A (en) * 2006-06-26 2008-01-10 Aruze Corp Game machine
JP2008080526A (en) * 2006-09-26 2008-04-10 Brother Ind Ltd Liquid jet apparatus
JP2009012909A (en) * 2007-07-03 2009-01-22 Olympus Corp Image recording device
JP5311208B2 (en) * 2008-12-24 2013-10-09 ę Ŗ式会ē¤¾ćƒŖć‚³ćƒ¼ Image forming apparatus
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JP2013006638A (en) * 2011-06-22 2013-01-10 Duplo Corp Sheet conveying device, and image recording apparatus
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KR101900626B1 (en) 2018-09-19
US10046573B2 (en) 2018-08-14
KR20170023128A (en) 2017-03-02
TWI637856B (en) 2018-10-11
WO2016008596A1 (en) 2016-01-21
IL249493B (en) 2021-05-31
IL249493A0 (en) 2017-02-28
CN106660375A (en) 2017-05-10
EP3169528B1 (en) 2019-12-11
CN106660375B (en) 2019-02-19
TW201612021A (en) 2016-04-01
ES2768724T3 (en) 2020-06-23
US20170157955A1 (en) 2017-06-08
JP2017522250A (en) 2017-08-10

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