EP1091855B1 - Procede offset a feuilles et presse offset a feuilles - Google Patents

Procede offset a feuilles et presse offset a feuilles Download PDF

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Publication number
EP1091855B1
EP1091855B1 EP99955959A EP99955959A EP1091855B1 EP 1091855 B1 EP1091855 B1 EP 1091855B1 EP 99955959 A EP99955959 A EP 99955959A EP 99955959 A EP99955959 A EP 99955959A EP 1091855 B1 EP1091855 B1 EP 1091855B1
Authority
EP
European Patent Office
Prior art keywords
air
sheet
housing
powder
printing press
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
EP99955959A
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German (de)
English (en)
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EP1091855A1 (fr
Inventor
Hans-Peter Koch
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 EP1091855A1 publication Critical patent/EP1091855A1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F23/00—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing
    • B41F23/04—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing by heat drying, by cooling, by applying powders
    • B41F23/044—Drying sheets, e.g. between two printing stations
    • B41F23/0443—Drying sheets, e.g. between two printing stations after printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F23/00—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing
    • B41F23/04—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing by heat drying, by cooling, by applying powders
    • B41F23/06—Powdering devices, e.g. for preventing set-off
    • 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
    • B65H29/246—Air blast devices acting on stacking devices
    • B65H29/247—Air blast devices acting on stacking devices blowing on upperside of the sheet

Definitions

  • the invention relates to a sheet-fed offset printing method according to the preamble of claim 1 and to a sheetfed offset printing press according to the preamble of claim 14.
  • a printing method and a printing press of this type are described in DE-A-199 01 670, which was not published on the relevant date for the priority of the present application day.
  • the powder which usually consists of starch, absorbs there a portion of the existing liquid, for example surface water originating from the dampening solution supply and optionally also more volatile or less viscous constituents of the printing ink. Since the liquid absorbed by the powder does not or significantly slows down in the substrate and also does not participate in the chemical cross-linking process of the ink, on the one hand the moisture content of the sheet when depositing on the sheet stack higher, causing the drying delays and required until further processing of the printed products Time lasts longer. On the other hand, the liquid picked up by the powder may also cause the rubbing resistance of the ink to decrease as powder particles deposited on the wet ink rub off, thereby exposing incompletely dried dot-shaped surface areas of the ink underneath.
  • the present invention seeks to further improve a sheet-fed offset printing process and a sheet-fed offset printing machine of the type mentioned in terms of reducing the powder spread.
  • the invention is based on the finding that the main transport routes for fluidized powder in the housing of the sheet delivery due to the suction effect of the sheet conveyor along the latter run, the air flow along the empty strand powder transported in the direction of the printing press.
  • the supply and / or by the extraction of air along the return strand as described in DE-A-199 01 670, a large part of the entrained powder can be eliminated, especially if according to a preferred embodiment of the present invention by the supply and / or extraction of air is generated by the empty strand transverse to the direction of movement passing through the air flow, which causes an interruption of the powder-laden air flow along the empty strand.
  • a negative pressure is generated behind the point of interruption, which is used for the suction of powder-laden air from other areas of the sheet delivery can lead.
  • the air flows within the housing for in the direction of movement of the return strand behind the point at which the air is sucked off and / or supplied to dissipate by the suction effect of the empty strand along the same entrained powder-laden air from the flow path of the return strand, not loaded with powder air supplied into the housing.
  • This preferably pre-cleaned air replaces the discharged powder-laden air and prevents the subsequent flow of powder-laden air from other areas of the sheet delivery due to a negative pressure that can occur in an interruption of the flow path along the empty section.
  • the influx of powder-laden air from the area of a powder dusting device or a winningertrums the sheet conveyor in the flow path along the return strand are hindered or blocked by mechanical or fluidic means to an entry of powder from others Areas of the sheet delivery to reduce or completely stop.
  • the supply of the non-powdered air can be done by either air is blown from the outside into the housing and / or sucked by a negative pressure generated in the housing due to an interruption of the powder-laden air flow along the empty strand from the outside.
  • the last-mentioned variant has the advantage that, firstly, the amount of air injected for interrupting the air flow and / or for flushing purposes can be kept low and, secondly, that any powdered particles which might be contained in this air are transported in the direction of the printing press.
  • the air intake takes place in the simplest case through ventilation slots or ventilation grille in the top of the housing through which air exits from the interior of the sheet delivery in conventional printing machines.
  • the blown and / or sucked air is deflected when entering the housing in the direction of the printing press and then flows (as in conventional sheet displays the powdered air) by the suction of the sheet conveyor along the return strand to the delivery drum of the printing press. Since the housing of the sheet delivery is closed in this area, the air is deflected there together with the sheet conveyor and flows below and above the conveyed by the conveyor belt arch again in the direction of the powder apparatus. This air flow forms an air cushion above and below the freshly printed sheet, which may possibly be slightly reinforced on the underside by supplying air through the sheet guide plate and ensures an extremely smooth running of the bow.
  • Applicant believes that an almost complete absence of powder in this air cushion, i. in the vicinity of a lying between the printing machine and the powder apparatus section of the conveying run of the sheet conveyor that powder can only reach the surface of the wet substrate and the wet ink, if this is already pre-dried by repelling water and liquid binder components of the ink, so that less liquid can be absorbed or bound by the powder.
  • the powder does not stick to a pre-dried surface of the ink, which often led to loss of quality in conventional printing without additional UV or IR drying, especially on high-gloss printing.
  • Mechanical means for blocking an influx of powder-laden air include, in particular, a dividing wall arranged between the return strand and the conveying run, which expediently extends over the entire width of the sheet delivery and over at least part of the length of the delivery of sheets, preferably beginning at the point where the air is sucked and / or supplied along the empty strand or the powder-laden air flow is interrupted, and then extends to the vicinity of the delivery drum of the printing machine.
  • Fluidic means for impeding an influx of powder-laden air into the flow path along the return path include, in particular, extraction of powder-laden air, supply of non-powdered air, or generation of targeted airflows which prevent powder laden air from entering the empty-path flow path ,
  • powdered air is sucked in the vicinity of the powder apparatus, preferably at the printing machine facing the rear edge of a serving for air extraction and air supply air-suction and Umlenkwanne to unwanted turbulence of powder away from the powder apparatus due to air turbulence prevent in the vicinity of the latter and at the same time direct a portion of the fresh air supplied into the housing of the display after passing through the slack side in the region of the powder apparatus in the direction of the printed sheet.
  • an air switch can be arranged above the powder apparatus, which in each case deflects a portion of the supplied air past the front and / or the printing machine-side rear side of the powder apparatus downwards.
  • the part directed to the front side is preferably part of the fresh air used for interrupting the air flow, which is blown in from above through the empty strand, while the part directed to the rear side Part is a part of the outside of the point of interruption sucked into the housing of the sheet delivery air.
  • the powder consumption can be extremely, i. be reduced to about 10% of the previously required quantities.
  • the powder essentially reaches only where it is needed, namely on the surface of the sheet, on the other hand, because there is significantly less powder needed due to the previously caused superficial drying of the printing ink and the substrate to a dropping the bow to prevent.
  • less powder consumption also means less powder emissions in the vicinity of the sheet delivery, so that this problem can likewise be largely eliminated.
  • additional air suction devices can additionally be provided, which serve to suck powder between the edges of the sheet outlet opening and the edges of the printed sheet before it is blown down from the delivery fans through the sheet exit opening into the vicinity of the sheet delivery to achieve a further reduction of powder emissions in the environment.
  • These are preferably an optionally equipped with brushes, arranged above the empty strand nozzle box from which clean air is blown down in the direction of the empty strand, arranged below the nozzle box in the space between the slack side and the delivery, possibly equipped with brushes air Extraction and deflection tub, each of which sucks a portion of the air or deflects in the direction of the printing press, and arranged in the direction of the empty strand behind the nozzle box and the tub air storage, from which the generated negative pressure sucks through air openings clean air into the housing of the sheet delivery ,
  • the air storage can be kept under a slight overpressure, so that the air is always fed into the interior of the housing of the sheet delivery.
  • the air in the interior of the air reservoir is preferably under atmospheric pressure. This allows according to a further preferred embodiment or alternative of the invention, a simple control of the air supply as a function of the printing speed, because higher printing speeds require higher running speeds of the sheet delivery, which in turn causes a stronger suction effect is sucked through the more air from the air reservoir.
  • paper sheets are successively transferred by means of an automated sheet feeder 4 from a paper stack 8 arranged in a sheet feeder 6 of the printing machine 2 to a feeder drum 10 of a first printing unit 12 and then through the first printing unit 12 and possibly further of the total of eight printing units (only two shown) transported to one or both sides on one or more colors to print.
  • the chain boom 20 consists essentially of two guided in opposite lateral guide rails parallel chains (not shown), which are connected at regular intervals by the gripper systems also referred to as bow gripper 18.
  • the chain boom 20 has a lower, the bow conveying conveying strand (leading system) 30, which is moved from the two sprockets 31 of a delivery drum 32 obliquely upwards and then deflected in the horizontal, before there are two drive sprockets 34 at the free end of Sheet delivery 22 reached.
  • Its upper return strand (return system) 36 moves horizontally from the sprockets 34 in the direction of the printing machine 2, before it is deflected obliquely downwards and returned to the delivery drum 32.
  • each sheet is guided in the direction of movement of the conveying 30 by Bogenleitbleche 38 contactlessly laterally adjustable Leitbügelbläsern 40 and over a arranged behind sheet brake 42 and then reaches an arc outlet opening 44 on the underside of the horizontal portion of the housing 24 of the sheet delivery 22.
  • the transferred by the gripper 18 to the sheet brake 42 and braked sheet with the help of several, arranged on the outlet opening 44 Auslagelmediaer 46 down to the sheet stacking stack 26 are blown. This rests on a lifting mechanism 48, which lowers the stack 26 in synchronism with the speed of the sheet feed.
  • the powder apparatus 50 In the vicinity of the upper end of the inclined portion of the chain conveyor 20 just before the deflection of the conveying strand 30 in the horizontal above the powder apparatus 50 is disposed in the intermediate space 52 between the conveying strand 30 and the empty strand 36 above.
  • the powder apparatus 52 dusted the top of the held by the sheet grippers 18 of the conveying strand 30 damp sheet with a finely powdered starch powder to prevent sticking (donning) of the sheets during subsequent stacking.
  • the powder apparatus 50 consists essentially of a transverse to the direction of movement of the chain conveyor 20 through the gap 52 extending pipe 54 having a plurality of powder discharge slots on its underside.
  • the starch powder is supplied by means of a blower (not shown) connected to the tube 54, the dosage depending on the size and color intensity of the printed areas.
  • two rows of brushes 76, 92 are provided which extend over the entire width of the sheet delivery and from above or from below in the path of movement of the empty strand 36 protrude.
  • the ends of the bristles of the brushes 76, 92 each bend in the passage of the gripper systems 18 so that they can pass through the brushes 76, 92, but prevent with the formation of a running along the empty strand in the direction of the printing machine air flow, with the powder the front part of the display 22 to the rear in the vicinity of the impression cylinder 16 and the delivery drum 32 can pass.
  • nozzle box 58 disposed above the return strand 36, which is provided on its underside with air outlet nozzles through which powder-free air is blown into the housing 24 from above.
  • nozzle box 58 below the nozzle box 58 is a combined air-suction and Umlenkwanne 56 in the intermediate space 52nd arranged between the conveying strand 30 and the empty strand 36, which serves to suck off a portion of the injected air together with the cleaned off from the slack side powder and to redirect the rest of the air in the direction of the printing press.
  • an air flow or air curtain is generated, which traverses the flow path of the sliver 36 transversely to the direction of movement and interrupts along with the brushes 76, 92 extending along the slipper track 36 powder-laden air flow.
  • the air suction and Umlenkwanne 56 consists essentially of a thin-walled flat housing 62.
  • the housing 62 extends below the lateral guides of the slack side 36 over the entire inside width of the chain boom 20 and forms a continuous closed partition wall between a flow path along the conveying run 30 and a flow path along the empty strand 36.
  • the housing 62 has a multiply bent in the direction of movement of the chain conveyor 20 upper housing wall 64, so that two flat troughs 66 are formed by an interposed therebetween Survey 68 are separated.
  • the upper housing wall 64 is further provided with spaced rows of powder suction slots 70.
  • suction slots 70 While adjacent center rows of suction slots 70 are respectively located at the lowest points of the wells 66, outer rows are disposed in close proximity to the opposite outer edges of the housing 62. Of the rows of powder suction slots 70, the obliquely downwardly directed slots 70 are subjected to the greatest pressure on the outer edge facing the printing press. Each of the rows of slots is connected by a suction channel 72 disposed within the housing 62 with one of four suction nozzle 74, which project beyond the pressure-side edge of the tub 56.
  • the suction nozzle 74 open into an air suction pipe 75, which is connected via a dust collector with cyclone and fine filter with a suction fan (not shown).
  • adjustable flow control valves 77 are arranged in front of the junctions of each suction nozzle 74 into the air suction pipe 75.
  • the valves 77 consist essentially of a threaded rod 79, which passes through a threaded bore in the wall of the air exhaust pipe 75 and at its inner and outer ends rotationally fixed with a disk-shaped plate 81 and an adjusting 83 is provided.
  • the brush 76 is located in that trough 66, which is first swept by the passing over the housing 62 Leertrum 36 of the chain arm 20 first.
  • the housing 62 further has a lower housing wall 80 which is provided between the two wells 66 and below the elevation 68 of the upper housing wall 64 with an upwardly recessed bulge 82, whose cross-section has the shape of an inverted U.
  • the housing wall 80 encloses the transverse drive shaft 60 which is arranged between the empty strand 36 and the delivery strand 30 and whose upper side carries the housing 62. To reduce the friction between the slow-running drive shaft 60 and the lower housing wall 80, this is provided in the bulge 82 with a Teflon coating.
  • the air-suction and Umlenkwanne 56 is supported on the drive shaft 60 so that they only with a few screws on opposite side cheeks of Chain boom 20 must be attached to hold them in place.
  • the serving as an air supply nozzle box 58 consists of a flat metal housing, which is provided on its the Leertrum 36 facing flat bottom with a plurality of air outlet nozzles through which the passing under the nozzle box 58 sheet gripper 18 of the chain conveyor 20 can be showered with air.
  • On the bottom of the brush 92 is further mounted in the direction of movement of the empty strand 36 immediately behind the brush 76 of the air-suction and Umlenkwanne 56.
  • the nozzle box 58 is connected by an air line (not shown) via an interposed controllable throttle valve 102 with a compressor 108, which sucks atmospheric air from the environment of the printing machine 2 and compressed to a pressure between 1.5 and 3.5 bar. Between the compressor 108 and the nozzle box 58, a particulate filter 110 is interposed to make the air supplied into the nozzle box 58 dust-free.
  • the amount of air supplied into the nozzle box 58 is between 30 and 50 m 3 / h and is dimensioned so that only a part is sucked through the powder intake slots 70 of the air suction and deflection trough 56, while the remaining air at the top of the air Suction and deflection trough 56 is deflected in the direction of the printing machine 2.
  • the air is supplied at a relatively low pressure of 1.5 to 2 bar, while the air pressure at a downstream cleaning of the sheet delivery 22 is increased to 3 to 3.5 bar.
  • the controllable throttle valve 102 in the air line allows a pulsed air supply into the nozzle box 58th
  • the chains and guide rails 28 of the chain arm 20 remain clean and saturated with fat, so that a powder-related wear can be prevented.
  • an air reservoir 97 is arranged on the upper side of the sheet delivery 22, the clean, i. air not loaded with powder is supplied from the particulate filter 110, which is then sucked through the ventilation grille 95 in place of ambient air.
  • the air in the air reservoir 97 is preferably maintained at atmospheric pressure, so that more or less dried air is supplied into the interior of the housing 24 in dependence on the height of the negative pressure generated by the slack side 36 of the sheet delivery arm 20. In this way, since the amount of negative pressure increases with the running speed of the sheet delivery arm 20, a simple printing speed-dependent control of the air supply can be achieved.
  • extended sheet delivery 22 are in the lower horizontal portion at two points ever another connected to the particulate filter 110 air reservoir 97 disposed over a ventilation grille in the housing top to ensure that the powder-free air to the delivery drum 32 and the Counter-pressure cylinder 16 of the printing press 2 is transported.
  • a parallel to the chain conveyor 20 partition 99 can be arranged between the return strand 36 and the conveying strand 30 of the sheet delivery, the reversal of the air flow before reaching the printing press 2 and a generation of powder-laden cross flows from the range of the delivery up into the flow path the empty strand 36 prevented.
  • the partition wall 99 may extend to the rear outer edge of the trough 56 to prevent in this way above the powder apparatus 50 an entry of powder in the injected or sucked clean air and thus in the flow path of the empty strand 36.
  • the partition 99 extends almost to the delivery drum 32nd
  • the air-accumulator shown in Fig. 7 extended Bogenauslage 22 additionally also in the direction of movement of the empty strand 36 before the air reservoir 97 another nozzle box 59 and one below the nozzle box 58 disposed between the return strand 36 and the delivery 30 and Heilabsaug- Gutumlenkwanne 57, the function and structure including two brush assemblies 91, 93 corresponds substantially to that of the nozzle box 58 and the air-suction and Umlenkwanne 56.
  • the trough 57 is somewhat shallower than the trough 58 and is supported by the side cheeks of the sheet delivery arm 20. For even longer sheet displays 22 and two such combinations of pan 57, nozzle box 59 and air storage 97 may be provided.
  • the air flow is interrupted along the empty strand 36 and deflected down to the conveying strand 30, as shown in Fig. 7.
  • the interrupted air flow enters a part of the air blown through the nozzle box 59 and the air sucked from the air reservoir 97 through the suction effect of the empty strand 36 are conveyed in the direction of the printing machine 2.
  • the blown by means of or nozzle boxes 58, 59 or sucked from the air storage 97 and transported by the suction of the empty section 36 of the sheet delivery arm 20 along the same to the delivery drum 32 forms above and below the arc an air cushion, to calm the sheet run contributes.
  • the air cushion generated on the underside of the sheet can be supplemented and reinforced by supplying air from the sheet guide plates 38.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Printing Methods (AREA)
  • Separation, Sorting, Adjustment, Or Bending Of Sheets To Be Conveyed (AREA)
  • Delivering By Means Of Belts And Rollers (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)
  • Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Manufacture Of Motors, Generators (AREA)
  • Discharge Heating (AREA)

Claims (31)

  1. Procédé d'impression offset de feuilles, selon lequel on fait varier les conditions d'écoulement à l'intérieur d'un carter (24) d'un système de sortie de feuilles d'une machine à imprimer offset pour feuilles, en vue d'empêcher une propagation ou prolifération incontrôlée de poudre dans le carter (24), de l'air chargé en poudre étant aspiré hors du carter (24) en au moins un endroit le long d'un brin vide de retour d'un dispositif de transport de feuilles (20) du système de sortie de feuilles,
    caractérisé en ce que des écoulements ou courants d'air à l'intérieur du carter (24) sont canalisés de la manière suivante, à savoir que, dans la direction de mouvement du brin vide de retour (36), après l'endroit où l'air chargé de poudre est aspiré hors du carter (24), de l'air non chargé de poudre, amené dans le carter (24), est dirigé et envoyé dans le parcours d'écoulement le long du brin vide de retour (36), en vue d'être transporté en direction de la machine à imprimer (2) sous l'effet de succion du brin vide de retour (36).
  2. Procédé selon la revendication 1,
    caractérisé en ce que de l'air non chargé de poudre est amené à partir du haut, dans le parcours d'écoulement le long du brin vide de retour (36).
  3. Procédé selon la revendication 1 ou 2,
    caractérisé en ce que la quantité de l'air amené est commandée par la vitesse d'impression de la machine à imprimer (2) ou la vitesse de marche du dispositif de transport (20).
  4. Procédé selon l'une des revendications 1 à 3,
    caractérisé en ce qu'au moins une partie de l'air amené est mise à disposition à pression atmosphérique et est aspirée dans le carter (24) par une dépression engendrée dans le carter (24).
  5. Procédé selon la revendication 4,
    caractérisé en ce que l'air est mis à disposition dans un accumulateur d'air (97) sur le côté supérieur du carter (24).
  6. Procédé selon l'une des revendications 1 à 5,
    caractérisé en ce qu'au moins une partie de l'air amené est déviée à travers le parcours d'écoulement du brin vide de retour (36) et au-devant d'un côté du dispositif de saupoudrage (50), qui est dirigé vers la machine à imprimer (2), vers le bas en direction des feuilles transportées par le brin de transport (30) au-devant du dispositif de saupoudrage (50), en vue de bloquer l'afflux d'air chargé de poudre en provenance de la zone du brin de transport (30) et du dispositif de saupoudrage de poudre (50), dans le parcours d'écoulement du brin vide de retour (36).
  7. Procédé selon l'une des revendications 1 à 6,
    caractérisé en ce que de l'air environnant épuré est amené dans le carter (24) du système de sortie de feuilles (22).
  8. Procédé selon l'une des revendications 1 à 7,
    caractérisé en ce qu'un écoulement d'air se propageant le long d'un brin vide de retour (36) du dispositif de transport de feuilles (20), en direction de la machine à imprimer (2), est interrompu par l'aspiration de l'air chargé de poudre et/ou l'amenée d'air de l'extérieur dans le carter (24) en au moins un endroit entre l'extrémité libre du système de sortie de feuilles (22) et la machine à imprimer (2).
  9. Procédé selon la revendication 8,
    caractérisé en ce que l'écoulement d'air est interrompu par au moins une rangée de brosses (76, 92) et/ou de l'air s'écoulant transversalement à la direction de mouvement du brin vide de retour (36).
  10. Procédé selon l'une des revendications 1 à 9,
    caractérisé en ce que l'on engendre un écoulement d'air traversant le brin vide de retour (36) transversalement à sa direction de mouvement, par le fait qu'audit au moins un endroit le long du brin vide de retour (36), l'air chargé de poudre est aspiré hors du carter (24) et/ou de l'air est amené de l'extérieur dans le carter (24).
  11. Procédé selon la revendication 10,
    caractérisé en ce que l'aspiration de l'air chargé de poudre et/ou l'amenée d'air de l'extérieur dans le carter (24) s'effectuent dans un tronçon partiel supérieur horizontal du système de sortie de feuilles (22).
  12. Procédé selon l'une des revendications 1 à 11,
    caractérisé en ce que les écoulements d'air à l'intérieur du carter (24) sont canalisés par le fait qu'une arrivée d'écoulement d'air chargé de poudre de la zone d'un brin de transport (30) du dispositif de transport de feuilles (20) ou d'un dispositif de saupoudrage (50) de poudre, est entravée ou bloquée dans un parcours d'écoulement le long du brin vide de retour (36).
  13. Procédé selon la revendication 12,
    caractérisé en ce que l'arrivée de l'écoulement d'air chargé de poudre, en provenance de la zone du brin de transport (30) du dispositif de transport de feuilles (20) ou d'un dispositif de saupoudrage (50) de poudre, dans le parcours de mouvement du brin vide de retour (36), est bloquée par une paroi de séparation (56, 99) disposée entre le brin vide de retour (36) et le brin de transport (30).
  14. Machine à imprimer offset pour feuilles comprenant un système de sortie de feuilles, un dispositif de saupoudrage placé dans un carter (24) du système de sortie de feuilles et destiné à saupoudrer les feuilles imprimées avec de la poudre, et des dispositifs d'aspiration d'air (56) qui sont disposés en au moins un endroit le long d'un brin vide de retour d'un dispositif de transport de feuilles (20) du système de sortie de feuilles, en vue d'empêcher, par la modification des conditions d'écoulement à l'intérieur du carter (24), une propagation ou prolifération incontrôlée de poudre dans le carter (24),
    caractérisée en ce que des moyens de canalisation (95 ; 97 ; 99 ; 75 ; 57, 59, 91, 93) dirigent de l'air non chargé de poudre, amené dans l'intérieur du carter après les dispositifs d'aspiration d'air (56) en se référant à la direction de mouvement du brin vide de retour (36), dans le parcours d'écoulement le long du brin vide de retour (36), en vue de transporter cet air en direction de la machine à imprimer (2), sous l'effet de succion de ce brin vide de retour.
  15. Machine à imprimer offset pour feuilles selon la revendication 14,
    caractérisée en ce que des moyens engendrant un écoulement d'air traversant le brin vide de retour (36) du système de sortie de feuilles (20) transversalement à sa direction de mouvement, englobent des dispositifs d'amenée d'air (58) pour amener de l'air de l'extérieur dans le carter et/ou des dispositifs d'aspiration d'air (56) pour aspirer de l'air chargé de poudre hors du carter (24).
  16. Machine à imprimer offset pour feuilles selon la revendication 14 ou 15,
    caractérisée en ce que les moyens de canalisation (95 ; 97 ; 99 ; 75 ; 57, 59, 91, 93) entravent ou bloquent une arrivée d'écoulement d'air chargé de poudre en provenance de la zone d'un brin de transport (30) du dispositif de transport de feuilles (20) ou d'un dispositif de saupoudrage (50) de poudre, dans le parcours d'écoulement le long du brin vide de retour (36).
  17. Machine à imprimer offset pour feuilles selon l'une des revendications 14 à 16,
    caractérisée en ce que les moyens de canalisation (95 ; 97 ; 99 ; 75 ; 57, 59, 91, 93) englobent au moins une ouverture d'air (95) dans le carter (24).
  18. Machine à imprimer offset pour feuilles selon l'une des revendications 14 à 17,
    caractérisée en ce que les moyens de canalisation (95 ; 97 ; 99 ; 75 ; 57, 59, 91, 93) englobent au moins un accumulateur d'air (97) communiquant avec l'intérieur du carter (24).
  19. Machine à imprimer offset pour feuilles selon la revendication 17 ou 18,
    caractérisée en ce que l'ouverture d'air (95) et/ou l'accumulateur d'air (97) débouche dans le carter (24) ou respectivement communique avec l'intérieur du carter (24) au voisinage du brin vide de retour (36).
  20. Machine à imprimer offset pour feuilles selon l'une des revendications 17 à 19,
    caractérisée en ce que l'ouverture d'air (95) et/ou l'accumulateur d'air (97) sont disposés sur le côté supérieur du carter (24), au-dessus du brin vide de retour (36).
  21. Machine à imprimer offset pour feuilles selon l'une des revendications 17 à 20,
    caractérisée en ce que l'ouverture d'air (95) et/ou l'accumulateur d'air (97) sont disposés entre les dispositifs d'aspiration d'air (56) et/ou les dispositifs d'amenée d'air (58) et un tambour de sortie (32) de la machine à imprimer (2).
  22. Machine à imprimer offset pour feuilles selon l'une des revendications 17 à 21,
    caractérisée en ce que l'air amené par l'intermédiaire de l'ouverture d'air (95) et/ou de l'accumulateur d'air (97) se trouve sous pression atmosphérique.
  23. Machine à imprimer offset pour feuilles selon l'une des revendications 17 à 22,
    caractérisée en ce que sous l'ouverture d'air (95) et/ou l'accumulateur d'air (97) est disposé un aiguillage d'air (75) qui subdivise l'air amené de l'extérieur dans le carter (24) du système de sortie de feuilles (22), en deux écoulements ou courants partiels dont l'un s'écoule le long d'un côté du dispositif de saupoudrage (50) de poudre, qui est dirigé vers la machine à imprimer (2), et l'un le long d'un côté éloigné de la machine à imprimer (2), en direction des feuilles transportées sous le dispositif de saupoudrage (50) de poudre.
  24. Machine à imprimer offset pour feuilles selon l'une des revendications 14 à 23,
    caractérisée en ce que la quantité de l'air amené peut être commandée par la variation ou modification de la vitesse d'impression de la machine à imprimer (2) ou de la vitesse de marche du dispositif de transport (20).
  25. Machine à imprimer offset pour feuilles selon l'une des revendications 14 à 24,
    caractérisée par des dispositifs (110) pour l'épuration de l'air amené.
  26. Machine à imprimer offset pour feuilles selon l'une des revendications 15 à 25,
    caractérisée en ce que les moyens de canalisation (95 ; 97 ; 99 ; 75 ; 57, 59, 91, 93) englobent une paroi de séparation (99) disposée sur une partie de la longueur du système de sortie de feuilles (22), entre le brin vide de retour (36) et le brin de transport (30).
  27. Machine à imprimer offset pour feuilles selon la revendication 26,
    caractérisée en ce que la paroi de séparation (99) s'étend jusqu'au voisinage de la machine à imprimer (2).
  28. Machine à imprimer offset pour feuilles selon la revendication 26 ou 27,
    caractérisée en ce que la paroi de séparation (99) s'étend à partir des dispositifs d'amenée d'air (58) et/ou des dispositifs d'aspiration d'air (56) jusqu'au voisinage de la machine à imprimer (2).
  29. Machine à imprimer offset pour feuilles selon l'une des revendications 15 à 28,
    caractérisée en ce qu'au moins une partie des dispositifs d'amenée d'air (58) et/ou des dispositifs d'aspiration d'air (56) est disposée dans un tronçon partiel supérieur horizontal du système de sortie de feuilles (22).
  30. Machine à imprimer offset pour feuilles selon l'une des revendications 15 à 29,
    caractérisée en ce que les dispositifs d'amenée d'air (58) et/ou les dispositifs d'aspiration d'air (56) engendrent un écoulement ou courant d'air qui traverse le brin vide de retour (36) transversalement à sa direction de mouvement, et produit une interruption d'un écoulement d'air chargé de poudre se propageant le long du brin vide de retour (36) en direction de la machine à imprimer (2).
  31. Machine à imprimer offset pour feuilles selon l'une des revendications 14 à 30,
    caractérisée par au moins un agencement de brosse (76, 92), qui obstrue partiellement le parcours d'écoulement du brin vide de retour (36).
EP99955959A 1998-11-16 1999-11-08 Procede offset a feuilles et presse offset a feuilles Expired - Lifetime EP1091855B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19852714 1998-11-16
DE19852714 1998-11-16
PCT/EP1999/008552 WO2000029215A1 (fr) 1998-11-16 1999-11-08 Procede offset a feuilles et presse offset a feuilles

Publications (2)

Publication Number Publication Date
EP1091855A1 EP1091855A1 (fr) 2001-04-18
EP1091855B1 true EP1091855B1 (fr) 2006-01-25

Family

ID=7887910

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99955959A Expired - Lifetime EP1091855B1 (fr) 1998-11-16 1999-11-08 Procede offset a feuilles et presse offset a feuilles

Country Status (5)

Country Link
US (1) US6606946B2 (fr)
EP (1) EP1091855B1 (fr)
AT (1) ATE316467T1 (fr)
DE (1) DE59913083D1 (fr)
WO (1) WO2000029215A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3949993B2 (ja) * 2002-04-02 2007-07-25 株式会社小森コーポレーション 印刷機のパウダー装置
JP2005088320A (ja) * 2003-09-17 2005-04-07 Komori Corp 印刷機の集塵装置
EP1857277A1 (fr) * 2005-03-08 2007-11-21 Konica Minolta Medical & Graphic, Inc. Sheet-fed printing press and printing method
DE102005048158A1 (de) * 2005-10-06 2007-04-12 Platsch Gmbh & Co.Kg Auslegestation für eine Druckmaschine
US9090053B1 (en) * 2009-03-03 2015-07-28 Bruce A. Franke Air dispenser for printing press
CN102310625A (zh) * 2010-07-09 2012-01-11 海德堡印刷机械股份公司 具有一个或多个干燥器的处理承印物的机器
CN105620036A (zh) * 2016-03-09 2016-06-01 苏州华策纺织科技有限公司 一种圆网印花机的除尘装置

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3434416A (en) * 1966-12-14 1969-03-25 Testone Electronics Co Printing press excess powder collector
US3556519A (en) * 1967-06-23 1971-01-19 Leo Keller Method and apparatus for stacking paper sheets or the like
CS167285B2 (fr) * 1969-06-11 1976-04-29 Heidelberger Druckmasch Ag
DE2148757B1 (de) * 1971-09-30 1972-09-07 Roland Offsetmaschf Reinigungsgeraet fuer eine Bogenauslegevorrichtung
US4052936A (en) * 1973-02-05 1977-10-11 Monarch Marking Systems, Inc. Printing apparatus
JPH0733080B2 (ja) * 1990-06-08 1995-04-12 板坂 征夫 印刷機の集麈装置
US5265536A (en) * 1993-01-11 1993-11-30 Millard James S System for collecting airborne powder, mists, and fumes
US5634401A (en) * 1995-04-25 1997-06-03 Electric City Printing Company Printing press powder removal system
JPH0957945A (ja) * 1995-08-25 1997-03-04 Kinki Seiko Kk 印刷機用集塵装置
DE19617194C2 (de) * 1996-04-29 2000-09-14 Ltg Lufttechnische Gmbh Luftabsaugvorrichtung für Druckmaschinen
DE29805248U1 (de) * 1998-03-24 1998-05-20 Roland Man Druckmasch Bestäubungseinrichtung in einer Druckmaschine
DE10007249A1 (de) * 1999-03-29 2000-10-05 Heidelberger Druckmasch Ag Ausleger für eine Bogen verarbeitende Druckmaschine

Also Published As

Publication number Publication date
EP1091855A1 (fr) 2001-04-18
DE59913083D1 (de) 2006-04-13
ATE316467T1 (de) 2006-02-15
US20010050012A1 (en) 2001-12-13
US6606946B2 (en) 2003-08-19
WO2000029215A1 (fr) 2000-05-25

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