EP1105296A1 - Method and device for powdering printing sheets - Google Patents

Method and device for powdering printing sheets

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Publication number
EP1105296A1
EP1105296A1 EP99936511A EP99936511A EP1105296A1 EP 1105296 A1 EP1105296 A1 EP 1105296A1 EP 99936511 A EP99936511 A EP 99936511A EP 99936511 A EP99936511 A EP 99936511A EP 1105296 A1 EP1105296 A1 EP 1105296A1
Authority
EP
European Patent Office
Prior art keywords
powder
metering
air flow
sheet
storage container
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
EP99936511A
Other languages
German (de)
French (fr)
Other versions
EP1105296B1 (en
Inventor
Reiner Haas
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.)
Weitmann and Konrad GmbH and Co KG
Original Assignee
Weitmann and Konrad GmbH and Co KG
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 Weitmann and Konrad GmbH and Co KG filed Critical Weitmann and Konrad GmbH and Co KG
Publication of EP1105296A1 publication Critical patent/EP1105296A1/en
Application granted granted Critical
Publication of EP1105296B1 publication Critical patent/EP1105296B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B41F23/06—Powdering devices, e.g. for preventing set-off

Definitions

  • the invention relates to a method for powdering printed sheets, the sheets having been printed on one or both sides in a printing press, and powder being removed from a storage container by means of a metering device and being inflated onto the sheet by means of an air stream, powder being then always conveyed in the air stream and is blown out when a bow is present.
  • the invention also relates to a device for powdering printed sheets, with a storage container for powder and a dosing element connected downstream of the storage container, which opens into an air stream discharging the powder. It is generally known that printed paper sheets are dusted with powder before stacking, so that the ink, which is still wet, does not smear during stacking.
  • the sheets are usually dusted with a powder device, in which powder is mixed with an air stream and the powder is discharged via the air stream and applied to the sheet.
  • the dusting devices generally have a storage container from which powder is filled into a powder container. An air stream is blown into this powder container and powder is whirled up and discharged with the escaping air. This air is then inflated onto the bow.
  • the invention is therefore based on the object of providing a method and / or a device with which the printed sheets can be dusted more precisely and substantially more simply and with less powder loss.
  • the method according to the invention has the essential advantage over the prior art that it is not the air flow but the addition of powder that is timed. This means that no resonances can form in the air flow, which could negatively influence the transport of the powder or the printed paper web.
  • the powder device Since the powder device is not located directly at the outlet of the air flow, that is to say immediately in front of the paper web, the powder is metered into the air flow with a lead time, this lead time being matched to the flow speed of the air flow and to the length of the air lines.
  • the powder is blown out exactly when there is a printed sheet of paper below the blow nozzles. If there is no sheet of paper below the blow nozzles, then powder-free air is blown out.
  • a further development of the invention provides that the metering element is blown out by means of the air flow, that is, it is freed from the powder. This process is advantageous because the powder is already mixed with air and the process is wear-free.
  • the above-mentioned object is achieved according to the invention by means of a device in that the metering element can be driven in cycles corresponding to the presence of a sheet to be powdered. Powder is always added to the air flow via this metering device when a printed sheet has to be dusted.
  • This has the significant advantage that, as already mentioned, a permanent air flow can be provided and a pulsating or vibrating air column can be avoided.
  • powder is only supplied to this air flow when this is necessary, i.e. when a sheet is transported past the pollination device.
  • the metering element has a rotationally symmetrical body, for example a cone, a ball, a roller, in particular with a horizontally driven axis of rotation or a metering belt.
  • the powder is transported from the storage container into the air stream via these transport devices, the transport elements being operated in cycles.
  • the roller has unevenness in the transport direction, grooves arranged on the circumference and running in the circumferential direction. These grooves have the significant advantage that the surface of the roller that receives the powder is increased significantly, as a result of which the adhesive forces by means of which the powder is held on the roller are significantly higher than in the case of metering elements with a smooth surface. The powder adheres so well to the grooved roller that it does not fall out of the grooves even by gravity.
  • a roller is known from US Pat. No. 4,867,063, which is provided with cells on its surface. Free-flowing material can also be transported in a simple manner via this cell conveyor, but the problem with the transport of powder arises that the cells gradually become clogged, so that the transported volume decreases over time. With such cell conveyors there is therefore no guarantee of constant volume transport over a longer period of time.
  • the invention provides that the dosing member is provided with a device for detaching the powder from the dosing member.
  • This device is a squeegee, a brush, a blowing nozzle or the like.
  • Such devices can be inserted into the in a relatively simple manner Engage the circumferential grooves of the roller and remove the powder. This is not possible with cell conveyors, since the individual cells cannot be interfered with, for example, with a doctor.
  • a further development provides that the dosing member has a powder-friendly surface.
  • the dosing member is a circular disc with concentric rings on which the opening of the storage container is seated in certain areas, so that powder is conveyed out of this opening area via the concentric rings. This powder is then lifted out of the concentric rings using a squeegee. Possibly, the powder can also be blown out of the rings using a suitable device.
  • the metering element In order to enable the metering element to be operated in cycles, it has a stepper motor as the drive.
  • This stepper motor whose speed and frequency can be changed, is controlled via the transport device (sheet delivery device) for the printed paper sheets.
  • a change in the drive speed of the stepper motor causes a change in the volume flow and by changing the clock frequency, the dosing element can be adapted to the size and speed of the paper sheets.
  • the metering element has an outlet opening which is offset in the direction of rotation by more than 180 ° to the inlet opening. In this way it is prevented that the powder flows directly from the inlet opening over the grooves of the roller of the dosing member to the outlet opening and is mixed there in an uncontrolled manner with the air flow.
  • FIG. 1 shows a longitudinal section through a metering device of a pollination device
  • FIG. 2 shows a section II-II according to FIG. 1.
  • the reference numeral 1 denotes a metering element which has a funnel serving as a storage container 2, in which powder 3 is stored.
  • the storage container 2 has an outlet opening 4 which is seated on a roller housing 5.
  • this roller housing 5 is a metering roller 6 arranged around a horizontal axis
  • This metering roller 6 has an essentially cylindrical shape and is located almost without play in a corresponding bore in the roller housing 5.
  • the outlet opening 4 opens into an inlet opening 8, which is provided in the upper region of the roller housing 5, and via which the one stored in the storage container 2 Powder 3 can enter the roller housing 5.
  • the inlet opening 8 opens directly onto the surface 9 of the roller 6.
  • the surface 9 of the metering roller 6 is provided in the circumferential direction with a plurality of grooves 10 which extend beyond the inlet opening 8 on both sides of the metering roller 6. In this area, powder no longer gets into the grooves 10, so that the grooves there act as a labyrinth seal. Via the grooves 10, which are filled with powder, the powder is transported in the direction of an outlet opening 11, which is not directly below the inlet opening
  • FIG. 2 it can also be seen that on the underside 15 of the roller housing 5 in the area of the front ends of the metering roller 6 two bores 16 are provided, through which powder straying into the labyrinth seal is removed into the collecting funnel 14, so that the latter is not in the bearings of axis 7 can reach.
  • the metering roller 6 is overhung, with a stepping motor 19 serving as drive 18 on one side of a holding bracket 17 and the roller housing 5 with the metering roller 6 on the shaft on the other side of the holding bracket 17 of the stepper motor 19 is plugged in.
  • the floating mounting of the metering roller 6 enables a quick and uncomplicated exchange for maintenance and / or repair purposes.
  • the bracket 17 is fastened to a frame 29 by means of bolts 27 and rubber buffers 28.
  • the volume transported is set via the stepping motor 19, in particular via its speed.
  • the cycle time is adapted to the speed or to the cycle time of the paper sheets via the frequency of the stepping motor 19.
  • the powder conveyed by the metering roller 6 falls, as already mentioned, into the collecting funnel 14, which in turn is in a Injector device 20 opens out.
  • This injector device has a connection 21 through which air is blown in the direction of arrow 22.
  • This air enters through a nozzle 23 in a mixing channel 24.
  • Sheet delivery device and in particular the printing machine can be prevented.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Coating Apparatus (AREA)
  • Printing Methods (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Nozzles (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Agricultural Chemicals And Associated Chemicals (AREA)

Abstract

The invention relates to a method and device for powdering printed sheets of paper. According to the inventive method, powder (3) is periodically introduced into the air flow by means of a dosing element (1).

Description

Titel: Verfahren und Vorrichtung zum Bepudern bedruckter BogenTitle: Method and device for powdering printed sheets
BesehreibungDescription
Die Erfindung betrifft ein Verfahren zum Bepudern bedruckter Bogen, wobei die Bogen ein- oder beidseitig in einer Druckmaschine bedruckt worden sind, und Puder mittels eines Dosierorganes einem Vorratsbehälter entnommen wird und mittels eines Luftstromes auf den Bogen aufgeblasen wird, wobei immer dann Puder im Luftstrom gefördert und ausgeblasen wird, wenn ein Bogen präsent ist. Die Erfindung betrifft außerdem eine Vorrichtung zum Bepudern bedruckter Bogen, mit einem Vorratsbehälter für Puder und einem dem Vorratsbehälter nachgeschalteten Dosierorgan, welches in einen den Puder austragenden Luftstrom mündet. Es ist allgemein bekannt, dass bedruckte Papierbogen vor dem Abstapeln mit Puder bestäubt werden, so dass die noch feuchte Druckfarbe beim Abstapeln nicht verschmiert. Üblicherweise werden die Bogen mit einer Pudervorrichtung bestäubt, in welcher Puder mit einem Luftstrom vermischt wird und der Puder über den Luftstrom ausgetragen und auf den Bogen aufgetragen wird. Die Bestäubungsvorrichtungen weisen in der Regel einen Vorratsbehälter auf, aus welchem Puder in ein Pudergefäß eingefüllt wird. In dieses Pudergefäß wird ein Luftstrom eingeblasen und Puder aufgewirbelt und mit der austretenden Luft ausgetragen. Diese Luft wird dann auf den Bogen aufgeblasen. Bei diesen Bestäubungsvorrichtungen hat sich gezeigt, dass die Menge des ausgetragenen Puders sehr stark von der Menge des im Pudergefäß enthaltenen Puders und der Strömungsgeschwindigkeit des Luftstromes abhängt, und dass außerdem die Art des Puders eine große Rolle spielt . Außerdem bereitet der pulsierende Luftstrom große Probleme, wenn die Bestäubungsfrequenz in den Resonanzbereich des Luftstromes kommt.The invention relates to a method for powdering printed sheets, the sheets having been printed on one or both sides in a printing press, and powder being removed from a storage container by means of a metering device and being inflated onto the sheet by means of an air stream, powder being then always conveyed in the air stream and is blown out when a bow is present. The invention also relates to a device for powdering printed sheets, with a storage container for powder and a dosing element connected downstream of the storage container, which opens into an air stream discharging the powder. It is generally known that printed paper sheets are dusted with powder before stacking, so that the ink, which is still wet, does not smear during stacking. The sheets are usually dusted with a powder device, in which powder is mixed with an air stream and the powder is discharged via the air stream and applied to the sheet. The dusting devices generally have a storage container from which powder is filled into a powder container. An air stream is blown into this powder container and powder is whirled up and discharged with the escaping air. This air is then inflated onto the bow. These dusting devices have shown that the amount of powder discharged depends very much on the amount of powder contained in the powder container and the flow rate of the air flow, and that the type of powder also plays a major role. In addition, the pulsating air flow causes great problems when the pollination frequency comes into the resonance range of the air flow.
Der Erfindung liegt daher die Aufgabe zugrunde, ein Verfahren und/oder eine Vorrichtung bereitzustellen, mit der die bedruckten Bogen genauer und wesentlich einfacher und mit weniger Puderverlust bestäubt werden können.The invention is therefore based on the object of providing a method and / or a device with which the printed sheets can be dusted more precisely and substantially more simply and with less powder loss.
Diese Aufgabe wird mit einem Verfahren gelöst, wie es sich aus dem Anspruch 1 ergibt . Gemäß diesem Verfahren wird durch eine Taktung des Dosiervorganges, welche zur Präsenz des Bogens koordiniert ist, dem Luftstrom immer dann Puder zugeführt, wenn eine zu bepudernde Bogenoberflache anwesend ist.This object is achieved with a method as follows from claim 1. According to this method, a cycle of the dosing process, which is coordinated with the presence of the sheet, supplies powder to the air flow whenever a sheet surface to be powdered is present.
Dies bedeutet, dass permanent Luft gefördert wird, und dass diesem permanent geförderten Luftstrom immer dann Puder zugeführt wird, wenn eine zu bepudernde Oberfläche des Bogens anwesend ist . Das erfindungsgemäße Verfahren hat gegenüber dem Stand der Technik den wesentlichen Vorteil, dass nicht der Luftström sondern die Puderzugabe getaktet wird. Es können sich somit keine Resonanzen im Luftstrom ausbilden, die den Transport des Puders oder der bedruckten Papierbahn negativ beeinflussen könnten.This means that air is continuously conveyed and that powder is supplied to this permanently conveyed air flow whenever a surface of the sheet to be powdered is present. The method according to the invention has the essential advantage over the prior art that it is not the air flow but the addition of powder that is timed. This means that no resonances can form in the air flow, which could negatively influence the transport of the powder or the printed paper web.
Da sich die Pudervorrichtung nicht direkt am Auslass des Luftstromes, d.h. unmittelbar vor der Papierbahn befindet, wird der Puder mit zeitlichem Vorlauf dem Luftstrom zudosiert, wobei dieser zeitliche Vorlauf abgestimmt ist auf die Strömungsgeschwindigkeit des Luftstromes und auf die Länge der Luftleitungen. Der Puder wird exakt dann ausgeblasen, wenn unterhalb der Blasdüsen sich ein bedruckter Papierbogen befindet. Befindet sich kein Papierbogen unterhalb der Blasdüsen, dann wird puderfreie Luft ausgeblasen. Eine Weiterbildung der Erfindung sieht vor, dass das Dosierorgan mittels des Luftstromes ausgeblasen, d.h. vom Puder befreit wird. Dieses Verfahren ist vorteilhaft, da der Puder bereits mit Luft vermischt wird und das Verfahren verschleissfrei ist.Since the powder device is not located directly at the outlet of the air flow, that is to say immediately in front of the paper web, the powder is metered into the air flow with a lead time, this lead time being matched to the flow speed of the air flow and to the length of the air lines. The powder is blown out exactly when there is a printed sheet of paper below the blow nozzles. If there is no sheet of paper below the blow nozzles, then powder-free air is blown out. A further development of the invention provides that the metering element is blown out by means of the air flow, that is, it is freed from the powder. This process is advantageous because the powder is already mixed with air and the process is wear-free.
Die eingangs genannte Aufgabe wird mittels einer Vorrichtung erfindungsgemäß dadurch gelöst, dass das Dosierorgan korrespondierend zur Präsenz eines zu bepudernden Bogens taktweise antreibbar is . Über dieses Dosierorgan wird dem Luftstrom immer dann Puder beigemischt, wenn ein bedruckter Bogen bestäubt werden muss . Dies hat den wesentlichen Vorteil, dass, wie bereits erwähnt, ein permanenter Luftstrom bereitgestellt werden kann und dadurch eine pulsierende bzw. schwingende Luftsäule vermieden werden kann. Diesem Luftström wird aber nur dann Puder zugeführt, wenn dies erforderlich ist, d.h., wenn ein Bogen an der Bestäubungsvorrichtung vorbeitransportiert wird.The above-mentioned object is achieved according to the invention by means of a device in that the metering element can be driven in cycles corresponding to the presence of a sheet to be powdered. Powder is always added to the air flow via this metering device when a printed sheet has to be dusted. This has the significant advantage that, as already mentioned, a permanent air flow can be provided and a pulsating or vibrating air column can be avoided. However, powder is only supplied to this air flow when this is necessary, i.e. when a sheet is transported past the pollination device.
Bei erfindungsgemäßen Ausfuhrungsformen weist das Dosierorgan einen rotationssymmetrischen Körper, z.B. einen Kegel, eine Kugel, eine Walze, insbesondere mit einer horizontal angetriebenen Drehachse oder ein Dosierband auf. Über diese Transportvorrichtungen wird der Puder aus dem Vorratsbehälter in den Luftstrom transportiert, wobei die Transportelemente taktweise betrieben werden. Bei einem Ausführungsbeispiel, bei dem das Dosierorgan als Walze ausgebildet ist, weist die Walze in Transportrichtung verlaufende Unebenheiten, am Umfang angeordnete, in Umfangsrichtung verlaufende Rillen auf. Diese Rillen haben den wesentlichen Vorteil, dass die den Puder aufnehmende Oberfläche der Walze gravierend vergrößert wird, wodurch die Adhäsionskräfte, über welche der Puder an der Walze gehalten wird, wesentlich höher sind als bei Dosierelementen mit glatter Oberfläche. Der Puder haftet dabei so gut an der mit Rillen versehenen Walze, dass er nicht einmal durch Schwerkraft aus den Rillen fällt.In the embodiments according to the invention, the metering element has a rotationally symmetrical body, for example a cone, a ball, a roller, in particular with a horizontally driven axis of rotation or a metering belt. The powder is transported from the storage container into the air stream via these transport devices, the transport elements being operated in cycles. In one embodiment, in which the metering element is designed as a roller, the roller has unevenness in the transport direction, grooves arranged on the circumference and running in the circumferential direction. These grooves have the significant advantage that the surface of the roller that receives the powder is increased significantly, as a result of which the adhesive forces by means of which the powder is held on the roller are significantly higher than in the case of metering elements with a smooth surface. The powder adheres so well to the grooved roller that it does not fall out of the grooves even by gravity.
Zwar ist aus der US 4,867,063 eine Walze bekannt, die an ihrer Oberfläche mit Zellen versehen ist. Über diesen Zellenförderer kann zwar ebenfalls auf einfache Weise schüttfähiges Material transportiert werden, jedoch stellt sich beim Transport von Puder das Problem, dass die Zellen sich allmählich zusetzen, so dass das transportierte Volumen mit der Zeit abnimmt. Bei derartigen Zellenförderern besteht also keine Gewähr auf einen konstanten Volumentransport über einen längeren Zeitraum.A roller is known from US Pat. No. 4,867,063, which is provided with cells on its surface. Free-flowing material can also be transported in a simple manner via this cell conveyor, but the problem with the transport of powder arises that the cells gradually become clogged, so that the transported volume decreases over time. With such cell conveyors there is therefore no guarantee of constant volume transport over a longer period of time.
Die Erfindung sieht in einer weiterbildenden Ausgestaltung vor, dass das Dosierorgan mit einer Vorrichtung zum Ablösen des Puders vom Dosierorgan versehen ist . Diese Vorrichtung ist eine Rakel, eine Bürste, eine Blasdüse o.dgl.. Derartige Vorrichtungen können auf relativ einfache Weise in die in Umfangsrichtung verlaufenden Rillen der Walze eingreifen und den Puder herauslösen. Bei Zellenförderern ist dies nicht möglich, da z.B. mit einer Rakel nicht in die einzelnen Zellen eingegriffen werden kann.In a further development, the invention provides that the dosing member is provided with a device for detaching the powder from the dosing member. This device is a squeegee, a brush, a blowing nozzle or the like. Such devices can be inserted into the in a relatively simple manner Engage the circumferential grooves of the roller and remove the powder. This is not possible with cell conveyors, since the individual cells cannot be interfered with, for example, with a doctor.
Eine Weiterbildung sieht vor, dass das Dosierorgan eine puderfreundliche Oberfläche aufweist.A further development provides that the dosing member has a powder-friendly surface.
Bei einer anderen Ausfuhrungsform ist das Dosierorgan eine Kreisscheibe mit konzentrischen Ringen, auf der die Öffnung des Vorratsbehälters bereichsweise aufsitzt, so dass aus diesem Öffnungsbereich über die konzentrischen Ringe Puder herausgefördert wird. Dieser Puder wird dann mittels einer Rakel aus dem konzentrischen Ringen ausgehoben. Eventuell kann der Puder mit einer geeigneten Vorrichtung auch mittels Blasdüsen aus den Ringen ausgeblasen werden.In another embodiment, the dosing member is a circular disc with concentric rings on which the opening of the storage container is seated in certain areas, so that powder is conveyed out of this opening area via the concentric rings. This powder is then lifted out of the concentric rings using a squeegee. Possibly, the powder can also be blown out of the rings using a suitable device.
Um den taktweisen Betrieb des Dosierorgans zu ermöglichen, weist dieses als Antrieb einen Schrittmotor auf. Dieser Schrittmotor, dessen Drehzahl und Frequenz veränderbar ist, wird über die Transportvorrichtung (Bogenauslegevorrichtung) für die bedruckten Papierbogen angesteuert . Eine Veränderung der Antriebsgeschwindigkeit des Schrittmotors bewirkt eine Veränderung des Volumenstroms und durch eine Veränderung der Taktfrequenz kann das Dosierorgan an die Größe und Geschwindigkeit der Papierbogen angepasst werden. Um ein Ausfließen des Puders aus dem Vorratsbehälter zu verhindern weist das Dosierorgan eine Auslassöffnung auf, die in Drehrichtung um mehr als 180° versetzt zur Einlassöffnung angeordnet ist. Auf diese Weise wird verhindert, dass der Puder direkt von der Einlassöffnung über die Rillen der Walze des Dosierorgans zur Auslassöffnung fließt und dort unkontrolliert dem Luftstrom beigemischt wird.In order to enable the metering element to be operated in cycles, it has a stepper motor as the drive. This stepper motor, whose speed and frequency can be changed, is controlled via the transport device (sheet delivery device) for the printed paper sheets. A change in the drive speed of the stepper motor causes a change in the volume flow and by changing the clock frequency, the dosing element can be adapted to the size and speed of the paper sheets. In order to prevent the powder from flowing out of the storage container, the metering element has an outlet opening which is offset in the direction of rotation by more than 180 ° to the inlet opening. In this way it is prevented that the powder flows directly from the inlet opening over the grooves of the roller of the dosing member to the outlet opening and is mixed there in an uncontrolled manner with the air flow.
Weitere Vorteile, Merkmale und Einzelheiten der Erfindung ergeben sich aus der nachfolgenden Beschreibung, in der unter Bezugnahme auf die Zeichnung ein besonders bevorzugtes Ausführungsbeispiel im Einzelnen beschrieben wird. Dabei können die in der Zeichnung dargestellten sowie in der Beschreibung und in den Ansprüchen erwähnten Merkmale jeweils einzeln für sich oder in beliebiger Kombination erfindungswesentlich sein. In der Zeichnung zeigen:Further advantages, features and details of the invention result from the following description, in which a particularly preferred exemplary embodiment is described in detail with reference to the drawing. The features shown in the drawing and mentioned in the description and in the claims can be essential to the invention individually or in any combination. The drawing shows:
Figur 1 einen Längsschnitt durch ein Dosierorgan einer Bestäubungsvorrichtung; und1 shows a longitudinal section through a metering device of a pollination device; and
Figur 2 einen Schnitt II-II gemäß Figur 1.FIG. 2 shows a section II-II according to FIG. 1.
In der Figur 1 ist mit dem Bezugszeichen 1 ein Dosierorgan bezeichnet, welches einen als Vorratsbehälter 2 dienenden Trichter aufweist, in welchem Puder 3 bevorratet ist. Der Vorratsbehälter 2 weist eine Auslassöffnung 4 auf, die auf einem Walzengehäuse 5 aufsitzt. In diesem Walzengehäuse 5 ist eine Dosierwalze 6 angeordnet, die um eine horizontale AchseIn FIG. 1, the reference numeral 1 denotes a metering element which has a funnel serving as a storage container 2, in which powder 3 is stored. The storage container 2 has an outlet opening 4 which is seated on a roller housing 5. In this roller housing 5 is a metering roller 6 arranged around a horizontal axis
7 drehbar gelagert ist. Diese Dosierwalze 6 weist eine im Wesentlichen zylindrische Form auf und befindet sich nahezu spielfrei in einer entsprechenden Bohrung im Walzengehäuse 5. Die Auslassöffnung 4 mündet in eine Einlassöffnung 8, die im oberen Bereich des Walzengehäuses 5 vorgesehen ist, und über welche der im Vorratsbehälter 2 bevorratete Puder 3 in das Walzengehäuse 5 eintreten kann.7 is rotatably mounted. This metering roller 6 has an essentially cylindrical shape and is located almost without play in a corresponding bore in the roller housing 5. The outlet opening 4 opens into an inlet opening 8, which is provided in the upper region of the roller housing 5, and via which the one stored in the storage container 2 Powder 3 can enter the roller housing 5.
In der Figur 2 ist erkennbar, dass die Einlassöffnung 8 direkt auf die Oberfläche 9 der Walze 6 mündet. Die Oberfläche 9 der Dosierwalze 6 ist in Umfangsrichtung mit einer Vielzahl von Rillen 10 versehen, die beidseits der Dosierwalze 6 sich über die Einlassöffnung 8 hinaus erstrecken. In diesem Bereich gelangt kein Puder mehr in die Rillen 10, so dass die Rillen dort als Labyrinthdichtung wirken. Über die Rillen 10, die mit Puder angefüllt werden, wird der Puder in Richtung einer Auslassöffnung 11 transportiert, die nicht direkt unterhalb der EinlassöffnungIt can be seen in FIG. 2 that the inlet opening 8 opens directly onto the surface 9 of the roller 6. The surface 9 of the metering roller 6 is provided in the circumferential direction with a plurality of grooves 10 which extend beyond the inlet opening 8 on both sides of the metering roller 6. In this area, powder no longer gets into the grooves 10, so that the grooves there act as a labyrinth seal. Via the grooves 10, which are filled with powder, the powder is transported in the direction of an outlet opening 11, which is not directly below the inlet opening
8 liegt, sondern in Drehrichtung (Pfeil 12) um mehr als 180° versetzt zur Einlassöffnung 8 liegt (Figur 1) . In dieser Auslassöffnung 11 befindet sich außerdem eine Rakel 13, die in die Rillen 10 der Dosierwalze 6 eingreift, und mit der der in den Rillen 10 sich befindende Puder 3 ausgehoben wird, so dass dieser über die Auslassöffnung 11 nach unten aus dem Walzengehäuse 5 in einen Auffangtrichter 14 fallen kann. Die Rakel 13 gewährleistet, dass die Rillen 10 vollständig entleert werden und in der Einlassöffnung 8 wieder zur Aufnahme von Puder 3 zur Verfügung stehen.8, but is offset in the direction of rotation (arrow 12) by more than 180 ° to the inlet opening 8 (Figure 1). In this outlet opening 11 there is also a squeegee 13 which engages in the grooves 10 of the metering roller 6 and with which the powder 3 located in the grooves 10 is lifted out, so that it passes down through the outlet opening 11 from the roller housing 5 in a collecting funnel 14 can fall. The doctor blade 13 ensures that the grooves 10 are completely emptied and are again available in the inlet opening 8 for receiving powder 3.
In der Figur 2 ist noch erkennbar, dass an der Unterseite 15 des Walzengehäuses 5 im Bereich der stirnseitigen Enden der Dosierwalze 6 zwei Bohrungen 16 vorgesehen sind, über die in die Labyrinthdichtung hinein vagabundierender Puder in den Auffangtrichter 14 entfernt wird, so dass dieser nicht in die Lagerungen der Achse 7 gelangen kann. In Figur 2 ist außerdem erkennbar, dass die Dosierwalze 6 fliegend gelagert ist, wobei an der einen Seite eines Haltebockes 17 ein als Antrieb 18 dienender Schrittmotor 19 und auf der anderen Seite des Haltebockes 17 das Walzengehäuse 5 mit der Dosierwalze 6, die auf die Welle des Schrittmotors 19 aufgesteckt ist, sich befinden. Die fliegende Lagerung der Dosierwalze 6 ermöglicht einen schnellen und unkomplizierten Austausch zu Wartungsund/oder Reparaturzwecken. Der Haltebock 17 ist über Bolzen 27 und Gummipuffer 28 an einem Gestell 29 befestigt.In FIG. 2 it can also be seen that on the underside 15 of the roller housing 5 in the area of the front ends of the metering roller 6 two bores 16 are provided, through which powder straying into the labyrinth seal is removed into the collecting funnel 14, so that the latter is not in the bearings of axis 7 can reach. In Figure 2 it can also be seen that the metering roller 6 is overhung, with a stepping motor 19 serving as drive 18 on one side of a holding bracket 17 and the roller housing 5 with the metering roller 6 on the shaft on the other side of the holding bracket 17 of the stepper motor 19 is plugged in. The floating mounting of the metering roller 6 enables a quick and uncomplicated exchange for maintenance and / or repair purposes. The bracket 17 is fastened to a frame 29 by means of bolts 27 and rubber buffers 28.
Über den Schrittmotor 19, insbesondere über dessen Drehzahl, wird das transportierte Volumen eingestellt. Über die Frequenz des Schrittmotors 19 wird die Taktzeit an die Geschwindigkeit bzw. an die Taktzeit der Papierbogen angepasst .The volume transported is set via the stepping motor 19, in particular via its speed. The cycle time is adapted to the speed or to the cycle time of the paper sheets via the frequency of the stepping motor 19.
Der von der Dosierwalze 6 geförderte Puder fällt, wie bereits erwähnt, in den Auffangtrichter 14, der seinerseits in eine Injektorvorrichtung 20 ausmündet. Diese Injektorvorrichtung besitzt einen Anschluss 21 über welchen Luft in Richtung des Pfeils 22 eingeblasen wird. Diese Luft tritt über eine Düse 23, in einem Mischkanal 24 ein. Dabei entsteht im Trichterhals 25 ein Unterdruck, über welchen der Puder aus dem Auffangtrichter 14 angesaugt und in Richtung des Mischkanals 24 transportiert wird, wo er mit dem Luftstrom vermischt und in Richtung des Pfeils 26 in eine geeignete Verteilanlage weitertransportiert wird. Dadurch, dass im gesamten Bereich des Auffangtrichters 14 ein Unterdruck entsteht, tritt aus dem gesamten Dosierorgan kein Puder ins Freie aus, wodurch Verschmutzungen derThe powder conveyed by the metering roller 6 falls, as already mentioned, into the collecting funnel 14, which in turn is in a Injector device 20 opens out. This injector device has a connection 21 through which air is blown in the direction of arrow 22. This air enters through a nozzle 23 in a mixing channel 24. This creates a negative pressure in the funnel neck 25, via which the powder is sucked out of the collecting funnel 14 and transported in the direction of the mixing duct 24, where it is mixed with the air stream and transported in the direction of arrow 26 into a suitable distribution system. Due to the fact that a negative pressure is created in the entire area of the collecting funnel 14, no powder escapes from the entire dosing member, causing contamination of the
Bogenauslegevorrichtung und insbesondere der Druckmaschine verhindert werden. Sheet delivery device and in particular the printing machine can be prevented.

Claims

Patentansprüche claims
1. Verfahren zum Bepudern bedruckter Bogen, wobei die Bogen ein- oder beidseitig in einer Druckmaschine bedruckt worden sind, und Puder (3) mittels eines Dosierorganas1. Method for powdering printed sheets, the sheets having been printed on one or both sides in a printing press, and powder (3) by means of a metering organ
(1) einem Vorratsbehälter (2) entnommen wird und mittels eines Luftstromes auf den Bogen aufgeblasen wird, wobei immer dann Puder (3) im Luftström gefördert und ausgeblasen wird, wenn ein Bogen präsent ist, dadurch gekennzeichnet, dass durch zur Präsenz des Bogens koordinierte Taktung des Dosierorganes (1) dem Luftstrom immer dann Puder (3) zugeführt wird, wenn eine zu bepudernde Bogenoberflache anwesend ist.(1) is removed from a storage container (2) and is blown onto the sheet by means of an air flow, powder (3) being conveyed and blown out in the air flow whenever a sheet is present, characterized in that by coordinating the presence of the sheet Clocking of the metering element (1) the powder is always fed to the air flow (3) when a sheet surface to be powdered is present.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass permanent Luft gefördert wird.2. The method according to claim 1, characterized in that air is continuously conveyed.
3. Verfahren nach Anspruch 2, dadurch gekennzeichnet, dass der taktweise dem Vorratsbehälter (2) entnommene Puder3. The method according to claim 2, characterized in that the powder taken from the storage container (2) in cycles
(3) dem permanenten Luftström zugeführt wird.(3) is supplied to the permanent air flow.
4. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Puder (3) bezüglich des Bogens abhängig von der Strömungsgeschwindigkeit und der Länge der Luftleitungen mit zeitlichen Vorlauf dem4. The method according to any one of the preceding claims, characterized in that the powder (3) with respect to the arc depending on the flow speed and the length of the air lines with the lead time
Luftström zudosiert wird. Airflow is metered.
5. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass mittels des Luftstromes das Dosierorgan (1) ausgeblasen wird.5. The method according to any one of the preceding claims, characterized in that the metering element (1) is blown out by means of the air flow.
6. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass bei einem sich drehenden Dosierorgan (1) durch die Drehzahl die Fördermenge eingestellt wird.6. The method according to any one of the preceding claims, characterized in that in a rotating metering member (1) the flow rate is set by the speed.
7. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass bei einem sich drehenden Dosierorgan (1) die Formatanpassung durch die Taktfrequenz eingestellt wird.7. The method according to any one of the preceding claims, characterized in that the format adjustment is set by the clock frequency in a rotating dosing member (1).
8. Vorrichtung, insbesondere zur Durchführung eines Verfahrens nach einem der vorhergehenden Ansprüche, zum Bepudern bedruckter Bogen, mit einem Vorratsbehälter (2) für Puder (3) und einem dem Vorratsbehälter (2) nachgeschalteten Dosierorgan (1) , welches in eijen den Puder (3) austragenden Luftström mündet, dadurch gekennzeichnet, dass das Dosierorgan (1) korrespondierend zur Präsenz eines zu bedruckenden Bogens taktweise antreibbar ist.8. The device, in particular for carrying out a method according to one of the preceding claims, for powdering printed sheets, with a storage container (2) for powder (3) and a dosing element (1) connected downstream of the storage container (2), which in the powder ( 3) discharging air flow, characterized in that the metering element (1) can be driven in cycles corresponding to the presence of a sheet to be printed.
9. Vorrichtung nach Anspruch 8, dadurch gekennzeichnet, dass das Dosierorgan einen rotationssymmetrischen Körper, z.B. einen Kegel, eine Kugel, eine Dosierwalze (6) , insbesondere mit einer horizontal angeordneten Drehachse (7) , oder ein Dosierband oder eine Dosierscheibe mit vertikaler Drehachse aufweist.9. The device according to claim 8, characterized in that the metering member is a rotationally symmetrical body, for example a cone, a ball, a metering roller (6), in particular with a horizontally arranged axis of rotation (7), or has a metering belt or a metering disc with a vertical axis of rotation.
10. Vorrichtung nach Anspruch 9, dadurch gekennzeichnet, dass der Körper insbesondere die Walze (6) am Umfang angeordnete Rillen (10) aufweist.10. The device according to claim 9, characterized in that the body in particular the roller (6) has circumferentially arranged grooves (10).
11. Vorrichtung nach einem der Ansprüche 8 bis 10, dadurch gekennzeichnet, dass das Dosierorgan (1) mit einer Vorrichtung zum Ablösen des Puders (3) vom Dosierorgan11. The device according to one of claims 8 to 10, characterized in that the dosing member (1) with a device for detaching the powder (3) from the dosing member
(1) versehen ist.(1) is provided.
12. Vorrichtung nach Anspruch 11, dadurch gekennzeichnet, dass die Vorrichtung eine Rakel (13) , eine Bürste, eine Blasdüse o.dgl. ist.12. The device according to claim 11, characterized in that the device, a doctor blade (13), a brush, a blowing nozzle or the like. is.
13. Vorrichtung nach einem der Ansprüche 8 bis 12, dadurch gekennzeichnet, dass das Dosierorgan (1) eine puderfreundliche Oberfläche aufweist.13. Device according to one of claims 8 to 12, characterized in that the dosing member (1) has a powder-friendly surface.
14. Vorrichtung nach einem der Ansprüche 8 bis 13 , dadurch gekennzeichnet, dass als Antrieb (18) für das Dosierorgan (1) ein Schrittmotor (19) vorgesehen ist.14. Device according to one of claims 8 to 13, characterized in that a stepping motor (19) is provided as the drive (18) for the dosing member (1).
15. Vorrichtung nach einem der Ansprüche 8 bis 14, dadurch gekennzeichnet, dass das Dosierorgan (1) eine Auslassöffnung (11) aufweist, die in Drehrichtung (12) um mehr als 180° versetzt zur Einlassöffnung (8) angeordnet ist . 15. The device according to one of claims 8 to 14, characterized in that the dosing member (1) a Has outlet opening (11) which is arranged in the direction of rotation (12) offset by more than 180 ° to the inlet opening (8).
EP99936511A 1998-08-10 1999-07-10 Method and device for powdering printing sheets Expired - Lifetime EP1105296B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19836014A DE19836014A1 (en) 1998-08-10 1998-08-10 Imprinted sheet powdering arrangement
DE19836014 1998-08-10
PCT/EP1999/004863 WO2000009336A1 (en) 1998-08-10 1999-07-10 Method and device for powdering printing sheets

Publications (2)

Publication Number Publication Date
EP1105296A1 true EP1105296A1 (en) 2001-06-13
EP1105296B1 EP1105296B1 (en) 2002-08-21

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EP99936511A Expired - Lifetime EP1105296B1 (en) 1998-08-10 1999-07-10 Method and device for powdering printing sheets

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US (2) US6615723B1 (en)
EP (1) EP1105296B1 (en)
JP (2) JP3790103B2 (en)
AT (1) ATE222538T1 (en)
DE (3) DE19836014A1 (en)
WO (1) WO2000009336A1 (en)

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Also Published As

Publication number Publication date
ATE222538T1 (en) 2002-09-15
JP3790103B2 (en) 2006-06-28
DE19836014A1 (en) 2000-02-17
DE59902421D1 (en) 2002-09-26
JP2002178483A (en) 2002-06-26
DE29816740U1 (en) 1999-01-21
JP3825298B2 (en) 2006-09-27
JP2003510195A (en) 2003-03-18
US6250513B1 (en) 2001-06-26
US6615723B1 (en) 2003-09-09
EP1105296B1 (en) 2002-08-21
WO2000009336A1 (en) 2000-02-24

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