EP1179500B1 - Device and method for producing an air stream in a duplicating machine - Google Patents

Device and method for producing an air stream in a duplicating machine Download PDF

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Publication number
EP1179500B1
EP1179500B1 EP01116988A EP01116988A EP1179500B1 EP 1179500 B1 EP1179500 B1 EP 1179500B1 EP 01116988 A EP01116988 A EP 01116988A EP 01116988 A EP01116988 A EP 01116988A EP 1179500 B1 EP1179500 B1 EP 1179500B1
Authority
EP
European Patent Office
Prior art keywords
printing
air stream
powder
fans
fan
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.)
Not-in-force
Application number
EP01116988A
Other languages
German (de)
French (fr)
Other versions
EP1179500A2 (en
EP1179500A3 (en
Inventor
Helmut Braun
Bernd Heller
Thomas Dr. Wolf
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
Original Assignee
Heidelberger Druckmaschinen AG
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
Priority to DE10038774A priority Critical patent/DE10038774A1/en
Priority to DE10038774 priority
Application filed by Heidelberger Druckmaschinen AG filed Critical Heidelberger Druckmaschinen AG
Publication of EP1179500A2 publication Critical patent/EP1179500A2/en
Publication of EP1179500A3 publication Critical patent/EP1179500A3/en
Application granted granted Critical
Publication of EP1179500B1 publication Critical patent/EP1179500B1/en
Not-in-force legal-status Critical Current
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41FPRINTING MACHINES OR PRESSES
    • B41F23/00Devices for treating the surfaces of sheets, webs, or other articles in connection with printing
    • B41F23/04Devices for treating the surfaces of sheets, webs, or other articles in connection with printing by heat drying, by cooling, by applying powders
    • B41F23/06Powdering devices, e.g. for preventing set-off
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65HHANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H29/00Delivering or advancing articles from machines; Advancing articles to or into piles
    • B65H29/24Delivering or advancing articles from machines; Advancing articles to or into piles by air blast or suction apparatus
    • B65H29/245Air blast devices
    • B65H29/246Air blast devices acting on stacking devices
    • B65H29/247Air blast devices acting on stacking devices blowing on upperside of the sheet
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65HHANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H29/00Delivering or advancing articles from machines; Advancing articles to or into piles
    • B65H29/52Stationary guides or smoothers
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65HHANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00Handled material; Storage means
    • B65H2701/10Handled articles or webs
    • B65H2701/17Nature of material
    • B65H2701/176Cardboard
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65HHANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2801/00Application field
    • B65H2801/03Image reproduction devices
    • B65H2801/21Industrial-size printers, e.g. rotary printing press

Description

The invention relates to a device and a method for generating an air flow in one Duplicating machine, in particular in a printing press, according to the preamble of claim 1 and claim 12.

It is known in reproduction machines, for example in printing machines, which arcuate or web-shaped flat products, especially substrates, process, to support the transport of flat products through a stream of air.

In this way, for example, paper sheets in rotary printing machines through Transport gripper led to a front edge of the bow and in addition is their Trailing arch surface supported by an air cushion. This can be prevented be that the sheet touches components of the printing press and is damaged or that it comes to a greasing of the freshly printed ink.

Such a guide for a bow with an air flow between the bow and a sheet guiding surface is known from DE 43 08 276 A1. A respective bow is exposed to an air flow, which generates by means of a plurality of air jets is made of arranged in the sheet guide flow channels in the form of Openings of the sheet guide exit. These openings are with Blasdüsen provided which connected via blast air ducts with a compressed air source are, where appropriate, the blast air ducts individually or in functional groups by adjustable valves can be opened and closed.

A guide of the type described has the disadvantage that a precise Adjustment of the air flow is not possible because of the strength of the individual air jets can not be regulated continuously. To change the generated Flow profile would also require an exchange of the guide against a second Guiding carried out with modified nozzle arrangement.

Also in jibs of printing machines fans are known with which the printed Bow, which are released by the transport grippers, down to one Tray pile are pressed. DE 34 13 179 C2 describes a control and Regulating device of a sheet delivery for sheet-processing machines. It will be the bow by an air flow, which by above the transport path of the arc arranged blowing fans is supported in the storage. The Fans can be individually, in longitudinal or transverse rows, in diagonal row or in any mixture at a higher or lower speed or even switched off completely.

However, since the fans are quite large, only a small number be arranged adjacent to the sheet transport paths, so that the generation of a desired flow field is possible only with great inaccuracy.

Furthermore, even when powdering freshly printed sheets in the boom of a Printing machine used blower units. In DE 197 33 691 A1 is a Sheet-fed rotary printing machine shown in which the arc over a Air cushions are guided. Here are above the transport path powder nozzles provided with which the powder in an air-powder mixture on the bow is applied. Also in below the sheet transport path arranged baffles can be provided powder nozzles, which are acted upon with powder gas.

In the described device for powdering sheets, it may be undesirable Turbulence of the air-powder mixture come, causing the powder on components the printing press so that they need to be cleaned regularly. One precise, zonewise powder application is not with the help of the device described possible.

There are also known from the prior art fans, so for example from the US 5,006,761 and US 4,210,847, which, instead of a rotating propeller to use, exploit the phenomenon of electrical discharge. In US 4,210,847 a fan element is shown, which is an outer, cylindrical, non-conductive housing has at one end a grounded grid is attached, while on the the other end of a voltage applied to a wire is provided. At a applied voltage of up to 20 kV takes place at the front, non-insulated end of the Discharge a wire, creating ions near the wire, which towards the grounded grid due to the prevailing electric field be accelerated. By Impulsübertag are also not charged air molecules in Direction of the grid opening of the fan element accelerates, resulting in a flow of air of up to 500 ft./min (about 15 m / min). Such a fan element is characterized by a high reliability with at the same time simple construction and small Weight and by a controllable by the applied voltage airflow.

In US 5,006,761 is a similar device for generating an air flow in addition, to prevent peak discharges and to Reduction of the production of toxic gases by the discharges, one in the essential spherical body provided at the top of the discharge wire is attached, whereby the discharge uniformly on the outer surface of the Discharge wire takes place.

In addition, a fan was developed by the ETR GmbH, Dortmund, which also exploits the acceleration of charged air molecules between an enrobed electrode and a target electrode for flow generation, and reaches flow velocities up to 3 m / s. It is also proposed to combine individual fans to fan assemblies, for example, as a planar, checkerboard-like arrangement so as to increase the flow area. With a cross-sectional area of 1 m 2 , a volume flow of 11,000 m 3 / h can be generated with the ventilators described.

In DE 197 51 972 A1 a device for the dusting of sheets is disclosed, wherein a Gleitluftgebläse or a blower is used to generate a Gleitluftstroms, the is charged with Puderpartdceln. To the transfer of the thus generated powder gas To favor on the printed sheets to be powdered, can be a net-shaped electrode be provided, which is connected to a high voltage source and the powder particles electrically charged, so that they adhere well when hitting the sheet.

In DE-AS 1 286 051 a device for guiding a sheet with a Hold-down device described for generating an air flow through the Hold-down device and out of the hold-down device with compressed air on a Hose is supplied, wherein gas particles of the compressed air are electrically charged.

From DE-OS 26 46 798 is a device for the electrical charging of liquid or solid particles in a gas stream, wherein at an inlet side of the device a already existing air flow enters the device and within the device by a corona discharge zone is electrically charged. It can also be provided already with solid particles, such as starch powder, charged air flow in the Device to bring.

In view of the described prior art, it is an object of the present invention Invention, a device for generating an air flow in one Duplicating machine to create, which is a simple and maintenance-free construction and which makes it possible to precisely and easily control the strength of the airflow.

It is a further object of the present invention method for guiding and for To create flat products in reproduction machines, in which Flow fields are generated whose local strength is precise and easy to control.

Further, it is an object of the present invention to provide a method for zoning Powdering of substrates in reproduction machines to create, in which a Flow field is generated, the local strength is precise and easy to control.

These objects are achieved by the features of claim 1 and Claim 12 solved. Further features of the invention are in the subclaims contain.

The inventive device for generating an air flow in one Duplicating machine, in particular in a printing press, which at least one Fan unit, characterized in that the at least one fan unit includes at least one ion fan.

The device according to the invention enables the printer to precisely control the Air flow via the power supply of the ion fan. In addition, the Ion fan while maintaining the precision of the air flow control in its dimensions be substantially reduced compared to conventional propeller fans, resulting in the printer according to the invention by the use of one or more ion fans a high Space saving in the duplicating machine results. It is still possible, the To arrange electrodes of the at least one ion fan on a support, whereby a such, for example, planar arrangement of the electrodes in their dimensions reduced known, cost-effective manufacturing processes down to the microstructure area can be. The use of ion fans also leads to an advantageous Reduction of the noise level as well as wear-free operation, since on moving Parts, such as propellers, is dispensed with, and thus a storage of the same eliminated. The latter results in a significantly increased compared to known fans Lifespan.

In a further embodiment of the device according to the invention, it can be provided be that the at least one fan unit a number of substantially adjacent and following a space curve, in particular following a straight line, arranged Includes ion fan. In this way it is possible according to the invention, for example Ion fan rows transversely, parallel or in any orientation to the transport direction of flat products in the reproduction machine to build and arrange. Furthermore, by the compact design and curved arrangements of Ion fans are generated, which, for example, to the contour of a printing cylinder adapted in a printing press and can be arranged in the vicinity thereof. A Another embodiment of the invention may be a suction or a blow bar Transfer points of flat products, for example sheets, from a transport system to a downstream, for example from one transport cylinder to another, include, for example, the prevention of damage to the product handover the products.

It is also possible that the at least one fan unit of the invention Device a number of substantially adjacent and flat, in particular planar, arranged ion fans comprises. It can thereby in the simplest way For example, a matrix of ion fans can be constructed in which the ion fans are arranged like a checkerboard or honeycomb next to each other, and such Ion fan matrix may preferably be flat near the transport path Products can be arranged in a duplicating machine and the flat products apply an air stream. It is also possible to have such a matrix of To provide ion fans with any curvature of space, for example, in the meandering transport path of substrate sheet in one Sheet-fed rotary printing machine to integrate.

It can also be provided, the electrodes of individual ion fans on boards to arrange and thereby very many and very small ion fans in a small space to arrange. An exemplary circular target electrode may have a diameter of 100 microns and at a distance of a few centimeters to adjacent target electrodes be arranged. Such fan units can preferably be used in copiers.

In accordance with the invention, the number of ion fans for generating a desired flow field individually controllable, that is each individual ion fan generates a desired flow, so that the superposition of the individual flows desired flow field results. Such a flow field can be any Contour, for example, the flow rate can be transverse to the transport direction of a flat product in a duplicating machine towards the peripheral areas lose weight.

It is also possible to transport flat products whose trailing free end by means of a specifically set flow field in such a way during transport support a flutter of the trailing end is reduced or substantially is completely suppressed. So it can be provided, for example, by means of known Detection means the position of the free end of a flat product in the room too determine and determine the local strength of the flow field, for example, over one Control device to vary such that this position of a desired desired position of the free end of the flat product. It is still possible by means of Presence detection devices to determine whether a flat product in the Near one or more ion fan is located and in the absence of the flat product at least reduce the power of the respective toners. It is beyond that possible to turn off individual ion fans of the fan assembly, which, for example, at the Processing of small flat products, outside the range of flat Products produce an airflow. For sheet position detection this can for example optical or acoustic, in particular ultrasonic, Single-point scanning methods and devices or areal working Method using stereoscopy or fringe projection used become.

According to the invention, the air flows of individual ion fans can also be different Have directions. This can be done, for example, by the mechanical alignment of the Single fan or done in a preferred manner in that the target electrodes of the Fans are constructed such that they can be controlled segmented. So can to Example, the annular target electrode of a fan be divided into four segments, which can be individually supplied with a voltage, whereby the ion current of the discharge electrode to the energized segment of the target electrode is steered and thus leaves the ion fan in a variably controllable direction.

A device according to the invention can furthermore be characterized in that the at least one fan unit adjacent to a transport path of flat products, in particular of printing substrates, for example paper sheets or cardboard sheets, is arranged. By the adjacent arrangement according to the invention to the Transport path, it is possible in an advantageous manner, the transport of flat products be favorably influenced by the air flow generated by the fan unit or leader to support. So it can be provided, for example, a flat Arrangement of ion fans instead of a conventional sheet guide for leadership use of substrate sheet in a substrate sheet processing machine, whereby a stabilized transport of the printing material sheet is achieved and a Greasing freshly printed ink on the baffles in an advantageous Way can be prevented. It is according to the invention, in contrast to the use conventional baffles, when using the planar ion fan assembly possible, locally to change the flow rate and thus targeted to the flat products act. This can be done in the prior art only by replacing the Leading pale happen. For this purpose, it can continue to be provided in an advantageous manner, the device according to the invention in such a way that it is suitable at least part of the environment of the flat products with overpressure or negative pressure to atmospheric pressure for guiding the flat products apply.

In general, it is possible to use the ion fans in two different directions of action, so that, for example, in the direction of the substrate sheet sucking or blowing on this can be acted upon. So it can in the above described guiding the Substrate sheet during transport through a sheet processing machine, for example be advantageous, the trailing end of the guided substrate sheet with overpressure to apply these to touching these ends of the substrate sheet with the However, it can also be used to prevent blowing devices or other guide devices be advantageous, with a trailing end of a guided substrate sheet with Apply negative pressure. So it is for example advantageous, when leading a Substrate sheet with a transport cylinder, the front end of Substrate sheet is held by transport grippers of the transport cylinder, the Trailing end of the printing material by a negative pressure generated at the Suction and hold the transport cylinder, and thereby touching the trailing end with other components near the transport path of the Prevent substrate sheet. Also in sheet turning facilities can by means of a generated negative pressure on a printing material sheet on the turning drum adherent and be turned. For this purpose, according to the invention, ion fan-containing fan units be integrated within a cylinder or integrated into its surface.

A further embodiment of the device according to the invention is characterized in that a Powder container is provided with at least one feed unit, wherein the feed unit the powder from the powder container into the air stream of the at least one ion fan transported. Thus, it becomes possible over the precisely controllable, electrically charged Air flow of the ion fan also a powder application, for example on substrate sheets to achieve, wherein advantageously uncontrollable powder swirling avoided and thus the targeted local powder application to the Printing material sheet is possible. The charged air molecules can serve as carriers serve for the powder particles, which by electrostatic forces to the charged Air molecules are bound to or from these also via electrostatic forces be carried away. It can also be inventively linear or planar arrangements of powder devices that are in operative connection with ion fans provided be, whereby, for example, a linear powder application transverse to the transport direction of the Substrate sheet or a flat powder application is made possible on this. By The controllability of the ion fans is beyond the normal continuous powder application In addition, it is also possible to create a powder profile and targeted to the printing material to transfer. In this way it can be achieved that the respective printed zones a substrate according to the amount of their paint or varnish order with different amounts of powder are applied. This leads to the printer in Advantageous to a saving of powder, since this exactly to the necessary Powder requirement on the substrate sheet can be adjusted. Furthermore, can especially in zones of the printing material sheet in which no color was applied, the Powder quantity to a minimum, or even reduced completely. It's still on possible, through at least one other fan unit eventually excess powder to suck the environment of the substrates. It can be at least one more Fan unit, which may also include at least one ion fan, adjacent to be arranged the powder application fan units, or in a linear or planar Formation of powder application fan units can be suctioning single fans or Fan groups also arranged between the applying single fans of the fan unit are located. The extracted powder can advantageously return to the powder circulation the printing material processing machine are introduced, resulting in another Cost savings for the printer results.

Since charge can also be transferred to the flat products with the ion fans, may possibly present in the reproduction machine Ionisierleisten, for Charging the flat products can be saved in an advantageous manner.

An inventive method for guiding flat products, in particular of Substrates, in duplicating machines, the flat products at least can be performed in sections by an air flow, it can be characterized in that a Flow field by using a number of controllable, in particular individually controllable ion fans having fan unit is generated. By creating the Flow field with any, specifiable contour, the flat products in stabilized in an advantageous manner and be damaged, especially on her Surface, be prevented. It is also possible in an advantageous manner, the Flow field continuously or gradually to the transport conditions in the Reproduction machine or interference, for example by Drying devices caused to adapt, for example, to those on the fan units Passed flat products, especially on their location in the room or even at the Presence or absence. By acting on the flat products by means of Number of ion fans can thus maintain a maximum allowable Flatter amplitude of flexible flat products, which among other things, the weight the flat products depends.

Another inventive method, which is when depositing flat products is used in reproduction machines, especially when filing Printing materials, wherein the deposition of the flat products by an air flow at least can be supported by creating a flow field through use one of a number of controllable, in particular individually controllable, ion fans Identify the exhibiting fan unit. When using the method according to the invention is a in Advantageously controllable and thus controllable storage of flat products, especially of printing materials achieved. By generating the flow field By means of the individually controllable ion fans the storage of flat products in the Way, that a compact discard pile without being moved Single sheet is achieved. In this case, it is possible, for example, advantageously to produce the method according to the invention such a flow field, that the be deposited in a direction transverse to the transport direction of the Media in the middle very strong by the individual flows on the discard pile out are pressed, while in the outdoor areas, the strength of the individual flows after is reduced on the outside. It comes thus to a pressing of the new to be deposited Bow on the discard pile from the center to the outside areas, leaving a possibly existing air cushion under the new sheets to be deposited during the Ablegens can escape transversely to the transport direction under the printing material. The Flow field can continue to be deposited on the material properties of Substrates or other flat products, such as their bendability, to be adjusted, thus saving on both very thin and flexible products as well as with thicker and less bendable flat products, such as Cardboard sheet, in the desired manner, controlled and without damage and can be performed to cause the flat products.

An inventive method for zone-wise powdering of substrates in Reproduction machines, in particular in printing machines, the powder being the Substrate is supplied by an air flow can be generated by the generation a flow field by using one of a number of controllable, in particular designate individually controllable fan unit containing ion fans. The invention Method allows the powder application on the substrates without turbulence and with perform locally varying powder feed. This can be done in an advantageous manner Also such print jobs, which zonal strongly fluctuating paint jobs, with a zonal variegated amount of powder are provided.

Furthermore, it is possible in an advantageous manner, the method for guiding or for Laying flat products with the process of powdering substrates too combine, that is, at least some of the ion fans, which for leading or dropping be used simultaneously for powdering.

In general, it is also possible in the apparatus and methods described above individually controllable ion fan in an array of multiple ion fans computer-aided to control, with default values for the varying flow rates the individual ion fan, for example, from prefabricated flow profiles, which for Example are stored, can be removed. Such flow profiles can For example, for varying print jobs, substrates, varying color or Dampening agent application and also filed for varying production speeds, the means to have been saved. It is also advantageous, however possible, the flow profiles from measured pressure parameters of a printing machine, such as their rate of production, and the flow profiles during the operation of the reproduction machine. For example, can the flow profile of a sheet guiding device with increasing printing speed be strengthened as a whole.

The invention will be described below with reference to the drawings with reference to preferred Embodiments described. In the drawings are matching components denoted by the same reference numerals.

In the drawings show:

Fig. 1
a schematic sectional view of an ionic fan,
Fig. 2
a schematic sectional view of a linear arrangement of a plurality of ion fans for guiding a printing material sheet,
Fig. 3
a schematic view of a matrix arrangement of ion fans in the boom of a printing press,
Fig. 4
a schematic view of a powder device with an ion fan for powdering of substrates.

FIG. 1 shows the schematic structure of an ion fan 2 in a sectional view. this outwardly by a non-conductive housing 4, which for example a glass or a ceramic is limited. At its front end The ion fan 2 is limited by a conductive grid 8, while at its rear End by not shown fastening arms provided with an insulation 10th electrically conductive wire 6 is arranged, wherein the insulation 10 is also made of a glass or a ceramic can exist. Instead of the grid 8 may also be a conductive ring be arranged at the front end of the ion fan 2. In the shown Embodiment, a device for generating a voltage 14 is provided, via a line 18 to the wire 6 and via a line 16 to the grid. 8 connected is. As a result, a voltage or a high voltage, for example in of the order of about 2 to 3 kV between the wire 6 and the grid 8 generated become. However, it is also possible that the grid 8 is grounded and the Voltage means 14 is connected only via a line 18 to the wire 6, and thereby generates a voltage on the wire 6 to ground. By the created Tension becomes a discharge primarily at the front end 12 of the wire 6 causing 12 gas ions are generated in the vicinity of this end, which in the electrostatic field between the wire 6 and the grid 8 an acceleration in Direction of the grid 8 experience. By momentum transfer from the gas ions to nonionized Gas atoms or gas molecules 20 also become these toward the grid 8 accelerated and there is an air flow through the housing 4 of the ionic fan 2, which leaves the ion fan 2 as directed flow 22. This way you can Airflow of about 20 cm range can be generated. At a rear end of the As a result, air is sucked from the outside into the interior of the ion fan 2, such as indicated by the arrow 24.

It is also conceivable, instead of the grid 8 to use only a ring diaphragm as an electrode. When using several, individually controllable ring diaphragms with different Diameters, can by the selected control of a certain annular aperture of the Opening diameter of the ion fan can be varied and thus at the same Air flow volume, the flow rate can be changed.

FIG. 2 shows a series arrangement of ionic fans 2 which have one as described in FIG Have structure, and are arranged close together. Every single one Ion fan 2 in turn has an insulating housing 4 and an insulation 10 and a electrically conductive grid 8 and an electrically conductive tip 6, which in each case via a Line 16 and 18 via a carrier 30 and further lines 34 with a Voltage device 32 are electrically connected. On the carrier 30 are not in shown conductive connections from the respective lines 16 and 18 of a each individual ion fan 2 to respective lines of the number of lines 34 of Voltage device 32 is provided, so that the voltage device via a likewise not shown control device on selected ion fans 2 a desired Can apply voltage or high voltage. This voltage can last for a longer time Period applied to the ion fan, but it can also be provided, the voltage vary in time. Three selected ion fans 2 each produce the same Air flow 38, which is represented by the same length and the same number of arrows 38 shall be. Three further selected ion fans 2 generate a locally variable Flow profile 39, which corresponds to a linear flow field and through the different length of the arrows of the airfoil 39 should be displayed. One Substrate sheet 50, which of a transport gripper 40, by means of attached thereto Gripper fingers 42 and gripper pads 44 is shown, in particular at his free Trailing end 52 a wave-shaped course, which the flow profile 39th equivalent. As shown in FIG. 2 can be seen, by a stronger air flow 39 a of Substrate sheets 50 are further spaced from the ionic fans 2 and by a weaker air flow 39b of the printing material sheet 50 closer to the ion fan 2 introduced become. As a result, a targeted action of the ion fan 2 on the position of the Substrate sheet 50 possible. By a non-illustrated detection device for location of the printing material sheet 50 in space, in particular the position of the printing material sheet In contrast to the series of ionic fans 2, position-related measured values can be integrated Control device are forwarded in the voltage device 32, so that this Flow profile 39 of selected ion fans for Correction of the position of the printing material sheet 50 vary over a changed voltage can.

In Fig. 3, a matrix arrangement of ion fans 2 is shown, all of which a conductive outlet opening, for example in the form of a grid 8 or only one conductive boundary of the non-conductive housing and a conductive discharge tip 6 exhibit. Both electrodes 6 and 8 are connected via respective lines 18 and 16 with a Voltage device 14 conductively connected. Similar as described in Fig. 2, can over the voltage device 14 via lines not shown each Ion fan segment 2 of the matrix array are individually controlled, and thereby the Air flow of each segment can be adjusted. It is thereby possible to produce a flow profile or flow field 62 which, as shown in FIG. 3, for example, in cross-section may have a V-shape. A printing material sheet 59, which is to be stored on a discard pile 60 and which in the direction of Arrows 64 is supplied to the discard pile 60, by the flow profile 62 in the Middle 66 of the airfoil 62 pressed more strongly against the discard pile 60 as in the Edge regions 68 of the airfoil 62. This can be under the Air to be deposited abzufegenden printing material 59 transversely to the direction 64 escape.

The powder device shown in Fig. 4 comprises an ion fan 2, which Discharge electrodes 6 and 8, which via lines 16 and 18 with a Voltage device 14 are connected. It is also a powder reservoir 70 with Powder 72 contained therein and a metering device 74 with a metering roller 76th shown. The powder 72 in the reservoir 70 is rotated by the rotation of the Dosing roller 76 through a gap between the metering roller 76 and the outer wall of the Metering device 74 and fed to the air flow of the ion fan, whereby a Air-powder mixture 78 is formed, which is blown onto a printing material sheet 50 becomes. In this case, the rotational speed of the metering roller 76 and / or on the Ion fan 2 voltage applied to match the machine speed, allowing speed-compensated powdering. Of the Substrate sheet 50 is thereby from a transport gripper 40 through the effective range the powder device and transported over a guide 80 away. Powder devices of this type can transversely to the transport path in a manner not shown the printing material sheet 50 are arranged side by side and thus the powder zonal can be metered onto the printing material sheet 50.

LIST OF REFERENCE NUMBERS

2
ion fan
4
non-conductive housing
6
conductive wire / electrode
8th
conductive grid / electrode
10
isolation
12
front end of the wire / electrode
14
voltage device
16
management
18
management
20
gas molecules
22
airflow
24
airflow
30
carrier
32
voltage device
34
Number of lines
38
airflow
39
flow profile
39a
stronger airflow
39b
weaker airflow
40
transport claw
42
gripper fingers
44
Gripper pads
50
printing material
52
trailing end
59
printing material
60
discard pile
62
flow profile
64
movement direction
66
Middle region of the airfoil
68
Edge region of the airfoil
70
Powder reservoir
72
powder
74
metering
76
metering
78
Air powder mixture
80
guide

Claims (15)

  1. Device for generating an air stream (39a, 39b) in a duplicating machine, in particular a printing press, the device comprising at least one fan unit that includes at least one ionic fan (2) generating and accelerating gas ions by means of a discharge in such a way that the air stream (39a, 39b) is generated,
    characterized in that the fan unit comprises a row configuration or a matrix configuration of adjacent ionic fans (2), which are individually controllable by a voltage applied to the ionic fans (2) so that the superposition of the individual streams of the ionic fans (2) results in a desired flow profile or flow field.
  2. Device according to claim 1,
    characterized in that the at least one fan unit is arranged adjacent to a transport path of flat products (50), in particular printing material such as paper sheets or board sheets, and that the device applies an overpressure or an underpressure as compared to the ambient pressure to at least a part of the environment of the flat products (50) to guide the flat products (50).
  3. Device according to claim 1 or 2,
    characterized in that the at least one fan unit comprises a number of ionic fans (2) arranged substantially adjacent to each other and following a space curve, in particular a straight line.
  4. Device according to claim 1 or 2,
    characterized in that the at least one fan unit comprises a number of ionic fans (2) arranged substantially adjacent to each other and in an areal way, in particular in a flat areal way.
  5. Device according to one of claims 1, 3 or 4,
    characterized by
    a powder container (70) and at least one supply unit (74, 76) transporting the powder (72) from the powder container (70) into the air stream (78) of the at least one ionic fan (2).
  6. Device according to claim 5,
    characterized in that the device is suitable for applying powder (72) to printing material (50), in particular paper or board sheets.
  7. Device according to claim 6,
    characterized in that the number of ionic fans (2) and/or the at least one supply unit (74, 76) are individually controllable for a zonal application of powder to the printing material sheets (50), in particular transversal to the transport direction of the printing material sheets (50).
  8. Device according to claim 6 or 7,
    characterized by
    at least one further fan unit sucking away excess powder (78) from the environment of the printing material (50).
  9. Duplicating machine, in particular rotary offset printing press,
    characterized by
    a device for generating an air stream according to one of claims 1 to 8.
  10. Delivery of a duplicating machine, in particular of a rotary offset printing press,
    characterized by
    a device for generating an air stream according to one of claims 1 to 8.
  11. Cylinder in a duplicating machine, in particular in a rotary offset printing press,
    characterized by
    a device for generating an air stream according to one of claims 1 to 4, the device being arranged in the interior of the cylinder.
  12. Method of generating an air stream (39a, 39b) in a duplicating machine, in particular in a printing press, wherein the use of at least one fan unit is provided,
    comprising the generation and acceleration of gas ions by a discharge in an ionic fan in such a way that the air stream (39a, 39b) is generated,
    characterized in that the fan unit comprises a row configuration or a matrix configuration of adjacent ionic fans individually controlled by a voltage applied to the ionic fans (2), so that by superposition of the individual streams of the ionic fans (2) a desired flow profile or flow field is produced.
  13. Method of guiding flat products (50), in particular printing material, in duplicating machines, the flat products (50) being guided at least in areas by an air stream (39a, 39b) that is generated in accordance with the method of claim 12.
  14. Method of depositing flat products (59), in particular printing material, in duplicating machines, wherein the depositing of the flat products (59) is at least assisted by an air stream (62) that is generated in accordance with the method of claim 12.
  15. Method of zonally powdering printing material (50) in duplicating machines, wherein the powder (72, 78) is fed to the printing material (50) by an air stream (78) that is generated in accordance with the method of claim 12.
EP01116988A 2000-06-09 2001-07-12 Device and method for producing an air stream in a duplicating machine Not-in-force EP1179500B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE10038774A DE10038774A1 (en) 2000-06-09 2000-06-09 Printer powder ink air transporter creates flow electrostatically allows local ink deposition
DE10038774 2000-08-09

Publications (3)

Publication Number Publication Date
EP1179500A2 EP1179500A2 (en) 2002-02-13
EP1179500A3 EP1179500A3 (en) 2003-09-10
EP1179500B1 true EP1179500B1 (en) 2005-12-28

Family

ID=7651790

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01116988A Not-in-force EP1179500B1 (en) 2000-06-09 2001-07-12 Device and method for producing an air stream in a duplicating machine

Country Status (7)

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US (1) US6889609B2 (en)
EP (1) EP1179500B1 (en)
JP (1) JP2002160348A (en)
CN (1) CN1337313A (en)
AT (1) AT314300T (en)
DE (2) DE10038774A1 (en)
HK (1) HK1043767A1 (en)

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DE102013010318A1 (en) * 2012-07-13 2014-01-16 Heidelberger Druckmaschinen Ag Powder device for a printing machine
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Also Published As

Publication number Publication date
US6889609B2 (en) 2005-05-10
HK1043767A1 (en) 2002-09-27
DE10038774A1 (en) 2001-12-13
EP1179500A3 (en) 2003-09-10
EP1179500A2 (en) 2002-02-13
DE50108511D1 (en) 2006-02-02
US20020060407A1 (en) 2002-05-23
AT314300T (en) 2006-01-15
JP2002160348A (en) 2002-06-04
CN1337313A (en) 2002-02-27

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