EP0886194B1 - Laser printer - Google Patents

Laser printer Download PDF

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Publication number
EP0886194B1
EP0886194B1 EP98111231A EP98111231A EP0886194B1 EP 0886194 B1 EP0886194 B1 EP 0886194B1 EP 98111231 A EP98111231 A EP 98111231A EP 98111231 A EP98111231 A EP 98111231A EP 0886194 B1 EP0886194 B1 EP 0886194B1
Authority
EP
European Patent Office
Prior art keywords
laser printer
printer according
station
corona station
corona
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
EP98111231A
Other languages
German (de)
French (fr)
Other versions
EP0886194A1 (en
Inventor
Uwe Blanke
Ralf Möhlmann
Volker Schröder
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.)
Weidmueller Interface GmbH and Co KG
Original Assignee
Weidmueller Interface 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
Priority claimed from DE1997126236 external-priority patent/DE19726236C2/en
Application filed by Weidmueller Interface GmbH and Co KG filed Critical Weidmueller Interface GmbH and Co KG
Publication of EP0886194A1 publication Critical patent/EP0886194A1/en
Application granted granted Critical
Publication of EP0886194B1 publication Critical patent/EP0886194B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/14—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base
    • G03G15/16—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer
    • G03G15/163—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer using the force produced by an electrostatic transfer field formed between the second base and the electrographic recording member, e.g. transfer through an air gap
    • G03G15/1635—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer using the force produced by an electrostatic transfer field formed between the second base and the electrographic recording member, e.g. transfer through an air gap the field being produced by laying down an electrostatic charge behind the base or the recording member, e.g. by a corona device
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/16—Transferring device, details
    • G03G2215/1604—Main transfer electrode
    • G03G2215/1609—Corotron

Definitions

  • the invention relates to a laser printer according to the preamble of the claim 1.
  • a laser printer in which to be printed Good in the area between an image drum and an opposite one Corona station is already known. It can take the form of a Continuous laser label printer designed as a tabletop device his. It can be used to put labels on a label tape printing, the label tape being wound from a roll Carrier tape exists on the crosswise to the longitudinal direction of the tape divided paper sections coated with pressure sensitive adhesive removable are pinned. After printing on the paper sections there is a fixation by means of a toner fusing station that emits pulses in the light infrared flashing area that does not touch the label tape having.
  • JP-A-63-173 078 it is already known a spring-loaded transmission corona to be used in the area of an image drum.
  • a gap between the corona and the drum constant held to achieve a homogeneous image transmission.
  • the well-known Transfer station guides the paper to be printed between the spacer rolls so that there is no change in the corona gap with different Thickness of the paper results.
  • DE-A-27 54 495 is a transmission device for a copier known.
  • the print material is gripped on the image drum guided along.
  • the corona station is resilient to the opposite allow the gripper to pass through the paper.
  • the invention has for its object a laser printer in the Preamble of claim 1 mentioned type so that with it well of different thicknesses distributed over the cross-section can be provided with a perfect print image.
  • a laser printer according to the invention is characterized in that the Corona station is stored so that depending on the thickness of the continuous, to be printed goods the distance between image drum and corona station changes.
  • material of different thicknesses can be used with the invention Print on laser printers because the Corona station the distance between image drum and corona station automatically to the thickness of the material to be printed, if this in the area between the image drum and the corona station. manual and time-consuming presetting of the distance between the image drum and corona station can thus be omitted, so that a continuous Printing process is executable, even if the Should change the thickness of the material to be printed.
  • the corona station can also in the transport direction of the goods to be printed Running axis can be tilted, in order to possibly fluctuate in thickness of the material to be printed, viewed in the direction parallel to the longitudinal axis the image drum to be able to compensate.
  • the tiltable corona station ensures that the printable Reliable against the surface of the surface over its entire width Image drum is pressed, the pressing force by the corona station self-generated for this purpose in a suitable mechanical manner is biased or controlled by electromagnetic devices Compressive force.
  • the corona station is preferably plate-shaped, so that on The surface of the material to be printed can slide along your surface. Doing so there are no depressions or ridges on this surface. so that there is no danger that the goods to be printed will somehow be there could jam.
  • an electrical insulating plate of the corona station three spaced parallel to each other and metal tracks extending to the longitudinal axis of the image drum or embedded metal wires to transfer the toner particles from to enable the image drum on the material to be printed.
  • the metal tracks or metal wires are not directly exposed on the surface the corona station, so that it can also be printed through the material to be printed cannot be damaged.
  • suitable electrical potentials are applied, e.g. B. a high voltage to the middle metal track or the middle metal wire, and earth potential to the two outer metal tracks or metal wires. Should the metal tracks or metal wires nevertheless in the surface of the electrical insulating plate spaced next to each other, so should these are aligned with the surface.
  • the Invention provided that the corona station at this point with a Ramp is provided for the goods to be printed. Depending on the inclination the run-up slope then becomes the required distance between the image drum and corona station automatically set more or less quickly.
  • the electrically insulating plate in which the metal tracks or metal wires are also lying on a plate-shaped carrier, which in turn is provided with the ramp. Should the one with the electrical conductor tracks or metal wires provided electrically insulating Plate may be damaged, for example as a result of an electrical breakdown between said metal tracks or conductor wires, so only needs this and not the entire corona station to be replaced what shortens the repair time of the laser printer.
  • the said electrically insulating plate in simpler Way, for example by means of screws, attached to the plate-shaped carrier his. For this purpose, it lies, for example, in a suitably designed one Recess.
  • the corona station can, according to yet another embodiment of the invention be held displaceably on parallel guides in the direction of transport of the goods to be printed seen in the front and rear Area of the corona station can be arranged. This will create a relatively easy movement of the corona station when it comes up of the goods to be printed on the ramp and when entering ensures the gap between the corona station and the image drum.
  • the corona station can be springs in the direction of the image drum be biased, such as by compression springs against their underside press and support yourself on the housing of the laser printer.
  • a weight-loaded lever arm can also be used for this purpose be provided with its free end in the direction of the image drum presses and thus moves the corona station towards the image drum from below.
  • the advantage here is that it is independent approximately always of the thickness of the material to be printed uniform pressure force is obtained.
  • the coupling can also take place via a respective bearing, so that one low-friction tipping is possible.
  • Ball bearings can be used as bearings. Roller bearing, Needle bearings, etc., are used.
  • the corona station is between means of transport arranged to transport the goods to be printed, the Goods to be printed with the help of these means of transport in the direction of the corona station transported and pulled on the ramp.
  • the material to be printed can be held on a frame be along two parallel sides of the frame on the means of transport or transport belt is attached.
  • the attachment can e.g. B. in that the frame in the region of its long sides on the Means of transport or transport belt is attached.
  • the goods to be printed carried by the means of transport, can a still further embodiment of the invention in the area in front of the image drum also be guided past a heating station to the towards surface of the material to be printed, pointing to the image drum heat.
  • This will print images with even better quality the surface of the goods to be printed.
  • the preheating the surface of the goods to be printed z. B. by emitted Radiation energy takes place, for example by emitting infrared radiation.
  • the heating station can have one or more suitably designed ones Have heating lamps. Preheating the surface of the to good is printed before the good reaches the area reached between image drum and corona station. Already in the area of The image drum is then pre-fixed in the transferred toner through the preheated surface of the material to be printed, which the Improves print quality.
  • the goods to be printed can e.g. B. formed by marking elements be combined into mats. Such mats of marking elements are already well known and commercially available.
  • the marking elements are held by a frame, the one with its long sides on the transport belts already mentioned is plugged on, the studs protruding accordingly for this purpose have, which snap into the clamping openings of the frame.
  • the Marker elements can be broken off from the frame after they have been printed.
  • There are frames and markers preferably made of plastic material. You can e.g. B. on conductor ends can be attached or clamped on, but can also be used connect other devices in a latching or clamping manner.
  • FIGS 1 and 2 show the basic structure of a laser printer according to the present invention. It bears the reference number 1.
  • the laser printer 1 can be used for control purposes with a computer 2 via a Interface 3 be connected, as is well known.
  • the laser printer 1 has a housing 4, in the interior of which is approximately open halfway up a horizontally arranged support plate 5 for further elements of the laser printer 1.
  • a corona station is on the carrier plate 5 6 and a fixing station 7 attached.
  • Above the corona station 6 are a toner station 8, an image drum 9, and an exposure station 10 for exposure of the imaging drum 9 available.
  • a laser not shown, in the exposure station 10 is housed and data controlled by the computer 2 becomes.
  • the housing 4 of the laser printer 1 has an entrance gate 11 and an exit gate 12 and others for transport belts lying next to each other at a distance 13, 14, each of which is guided around two deflection rollers 15, 16 one of which is drivable. Two of these pulleys each 15, 15 and 16, 16 are spaced apart on a common axis 17, 18.
  • the two deflection rollers 15 are at a distance in front of the entrance gate 11 outside the housing 4 and are on a suitable and not shown bracket on the housing 4 on the axis 17 mounted.
  • the two deflection rollers 16 are at a distance behind the exit gate 12 outside the housing 4 and also by means of a bracket, not shown, on axis 18 Housing 4 mounted.
  • the deflection rollers 15, 15 and 16, 16 are so that the two transport belts 13, 14 horizontally through the housing 4th be moved through, being such a distance from each other have that they can accommodate the corona station 6 between them.
  • FIG. 2 This is one View from the entrance gate 11 towards the exit gate 12. Can be seen are the two deflection rollers 16, 16 on the axis 18, around which the conveyor belts 13, 14 are guided. The distance between the pulleys 16, 16 is so large that the corona station 6 between the Transport belts 13, 14 can be arranged.
  • the corona station 6 itself has a flat plate 19, which is approximately in height the transport belt 13, 14 running at the top comes to rest.
  • This Plate 19 is horizontal and parallel to the support plate 5 and is supported on this off.
  • To support the plate 19 on the support plate 5 are two Parallel guides 20, 21 are provided, the z. B. in the form of telescopes are trained.
  • Around the parallel guides 20, 21 are helical Compression springs 22, 23 arranged on the carrier plate 5 on the one hand and support on the lower surface of the flat plate 19 on the other hand and push the latter towards the imaging drum.
  • the plate 19 is there with its upper surface also parallel to the longitudinal axis of the image drum 9.
  • the flat plate 19 faces the one facing the entrance gate 11 On the end face a run-up slope 24, onto which goods to be printed run up can, if this with the help of the transport belt 13, 14 in the area is transported between image drum 9 and corona station 6.
  • a run-up slope 24 onto which goods to be printed run up can, if this with the help of the transport belt 13, 14 in the area is transported between image drum 9 and corona station 6.
  • the thickness of the material to be printed is more or less the plate 19 pressed down towards the support plate 5, whereby automatically the gap between the image drum 9 and the flat plate 19 to the thickness of the goods to be printed.
  • the two parallel guides lie one behind the other in the transport direction of the goods to be printed or in the center of the flat plate 19. In FIG. 2, one looks at the ramp 24 the flat plate 19.
  • the toner station 8, the imaging drum 9 and the exposure station 10 work in the known way, as well as the fuser 4, like this from the already mentioned DE 40 18 025 A1 is known.
  • the fixation station 7 has a high-energy flash lamp 26 for fixation of the toner image, which is to be printed on by means of the image drum 9 Has been applied well.
  • the conveyor belts go through this 13, 14 also the fixing station 7 and in doing so carry out what is to be printed Good through this.
  • the flat plate 19 To transfer the toner image from the image drum 9 to the one to be printed Well, there are at least 3 at a distance in the flat plate 19 parallel conductor tracks which lie opposite the image drum 9 and run parallel to their longitudinal axis. For example a high voltage can be applied to the middle of these conductor tracks while earth potential lies on the two outer conductor tracks comes. In this way there is a high electric field in the gap area generated between image drum 9 and corona station 6, for transmission the toner particles from the image drum 9 onto the one to be printed Serves well.
  • the conductor tracks mentioned are embedded in the plates 19, which consists of electrically insulating material, so that these conductor tracks not by the one leading over the surface of the plate 19 Good to be printed can be damaged.
  • the material to be printed is in the region of the deflection rollers 15, 15 on the Transport belts 13, 14 placed and in the area of the deflection rollers 16, 16 released from the conveyor belts 13, 14 or another station fed. It can between the pulleys 15, 15 and Housing 4 or elsewhere in the housing in the transport direction in front of the A heating station 27 may be provided lying down on the toner station. This heating station 27 with associated control serves to print the surface of the goods to be printed lying on the transport belts 13, 14 preheat to get a clean print image. The preheating takes place with the help of z. B. two heating lamps 28, the short-wave Send out infrared light.
  • Limit switches 29 are controlled, which are to be printed in the transport direction Good things lying one behind the other within the heating station 27 are arranged. These limit switches are marked by the one to be printed Well applied and let the heating lamps 28 work as long as long there is still material to be printed within the heating station 27.
  • Figures 3a to 3d show sectional views through the overhead Areas of the conveyor belts 13, 14, wherein the cuts perpendicular to Longitudinal direction of the conveyor belts 13, 14 are.
  • the material to be printed bears the reference symbol in FIGS. 3a to 3c 30 and in FIG. 3d the reference number 31
  • Plastic existing marking elements, which are attached to a web 32, 33 are, which can also consist of plastic. Doing so cancel the marking elements 30, 31 from the respective web 32, 33.
  • a plurality of parallel webs 32, 33 are at their opposite ends connected with longitudinal strips 34, 35 which are formed like a hollow profile and are open at the bottom. With these open at the bottom and like a hollow profile trained longitudinal strips 34, 35, the respective frame Place drivers 36, 37 on the respective conveyor belts 13, 14 are attached and protrude from these upwards or outwards.
  • the placement process is shown in Figures 3a to 3c for the frame 32, 34, 35.
  • the frame 33, 34, 35 is placed and supported in the same way only other marking elements 31.
  • the surfaces to be printed of the marking elements 30, 31 lie at the top in FIGS. 3a to 3d and thus come into contact with the peripheral surface of the image drum 9.
  • FIG. 4 shows a mat made of marking elements 30 'which are attached to a frame 32, 34, 35, which is similar to that in Figures 3a to 3c frame is formed.
  • the longitudinal strips 34, 35 of Frames shown in FIGS. 3a to 3c, 3d and 4 are always In trained in the same way so that they are all on the conveyor belt 13, 14 put on. Only the between the longitudinal strips 34, 35 held marking elements 30, 31 and 30 ', each on the Cross bars 32 are held, can have a different thickness. Nevertheless, all the marking elements can be made with the invention Print laser printers, as this depends on the thickness of the marking elements, the position of the flat plate 19 of the Corona station 6 can move.
  • Figures 5a and 5b show another side view and front view Embodiment of a corona station 6. Same element as in Figures 1 and 2 are provided with the same reference numerals and will not be described again.
  • the flat plate 19 lies here, in which the metal lines or corona wires are embedded, on a Carrier plate 38, which in turn on the telescopic parallel guides 20, 21 is displaceable relative to the carrier plate 5.
  • the carrier plate 38 is connected to the ramp 24, so that a recess 39 is obtained, in which the flat plate 19 can be used.
  • the plate 19 can be easily removed from the carrier plate 38 decrease with which she z. B. jammed or screwed can.
  • the carrier plate 38 is also by two compression springs 40, 41st pushed away from the carrier plate 5 to the material to be printed against the To be able to press image drum 9.
  • the compression springs 40, 41 are in the Distance to each other on a line parallel to the longitudinal axis of the imaging drum 9 runs.
  • FIGS. 6a and 6b shows a view along the arrows A-A ' of Figure 6a.
  • a further base plate 42 which can be mounted on the carrier plate 5 and forms the basis for the corona station 6.
  • On the bottom plate 42 are at a distance in the transport direction of the material to be printed
  • Two parallel guides 20, 21 arranged one behind the other, each telescopically are trained.
  • Each of the parallel guides 20, 21 contains one Sleeve 43, 44, which is fixed to the bottom plate 42, and one in the respective Sleeve 43, 44 slidably guided axes 45, 46, the axes 45, 46 wear a plate-shaped carrier 47 over their free ends.
  • connection between the axes 45, 46 and the carrier 47 can be carried out with such a game that the carrier 47 is still one Axis is easily tilted, which is parallel to the transport direction of the print Good lies, that is, horizontally in the plane of the drawing in FIG. 6a.
  • the carrier 47 has a run-up slope 48 on its front face on which the material to be printed comes up before it reaches the image drum 9 reached. In the direction of transport of the goods to be printed behind the ramp 48 is immediately followed by a recess 49 in which the already mentioned electrically insulating plate 19 comes to rest. In you will find the three metal tracks or metal wires already mentioned 50, 51 and 52 for generating a strong electric field for the transfer of the toner particles from the image drum 9 to the one to be printed Good.
  • the metal wires 50, 51 and 52 are with a connecting cable 53 connected via which the corresponding potentials are supplied become.
  • a lever 54 is provided, which rotates at an intermediate position on a bearing block 55 supports which is attached to the bottom plate 42. There is an axis for this 56 is provided, which protrudes through the lever 54 and through the bearing block 55.
  • the end of the lever pointing away from the plate-shaped carrier 47 54 is connected to a weight 57 which is in the longitudinal direction of the lever 54 is displaceable. The weight 57 therefore strives to lift the lever 54 to rotate clockwise around axis 56 in Figure 6b.
  • the other and shorter end of the lever 54 laterally carries a ball bearing 58, whose axis of rotation runs parallel to axis 56 and in the transport direction of the goods to be printed.
  • the lever 54 could be connected to the inner ring of the ball bearing 58.
  • the outer wreath of the ball bearing 58 is then connected to a shoulder 59 which at the Underside of the plate-shaped carrier 47 is attached.
  • the lever 54 is rotated clockwise about the axis 56 by the weight 57 rotated, the plate-shaped carrier 47 and with it the plate 19 moved towards the image drum 9.
  • the lever 54 can also the axis 60 of the ball bearing 58 can be tilted.
  • the tipping is allowed not be bigger than the game in the area between the parallel guides 20, 21 and the carrier 47 is present. In case bigger Tilting would also have 20, 21 joints in the area of the parallel guides be present for the carrier 47.
  • the pivoting movements the lever 54 are not so large, does not need anything special Play between the respective sleeves and axes of the parallel guides to be present.
  • the lever mechanism 54 to 57 thus achieves that in the relevant displacement range of the carrier 47 this always with a relatively constant pressure force in the direction of the image drum 9 is biased, regardless of the thickness of the print Good.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electrostatic Charge, Transfer And Separation In Electrography (AREA)
  • Laser Surgery Devices (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)

Abstract

The laser printer (1) is supplied with paper (30, 30', 31) to be imprinted in an area between an image drum (9) and an opposite corona station (6) which is stored flexibly. The corona station is preferably tiltable around an axis proceeding in transport direction of the paper to be imprinted. The corona station is preferably formed as a plate, whereby three, parallel to each other and to the longitudinal axis of the image drum proceeding metal paths or metal wires (50, 51, 52) are embedded in an electrically isolating disk (19) of the corona station.

Description

Die Erfindung betrifft einen Laserdrucker gemäß dem Oberbegriff des Patentanspruchs 1. Ein derartiger Laserdrucker, bei dem zu bedruckendes Gut im Bereich zwischen einer Bildtrommel und einer dieser gegenüberliegenden Koronastation hindurchgeführt wird, ist bereits allgemein bekannt. Er kann in Form eines als Tischgerät ausgebildeten Endlos-Laser-Etikettendruckers ausgebildet sein. Mit ihm lassen sich auf einem Etikettenband angebrachte Etiketten bedrucken, wobei das Etikettenband aus einem zu einer Rolle aufgewickelten Trägerband besteht, auf dem quer zur Längsrichtung des Bandes unterteilte, mit Haftkleber beschichtete Papierabschnitte abnehmbar angeheftet sind. Nach Bedrucken der Papierabschnitte erfolgt eine Fixierung mittels einer Toner-Fixierstation, die eine Impulse im Licht- Infrarot- bereich abstrahlende, das Etikettenband nicht berührende Blitzlampe aufweist. The invention relates to a laser printer according to the preamble of the claim 1. Such a laser printer, in which to be printed Good in the area between an image drum and an opposite one Corona station is already known. It can take the form of a Continuous laser label printer designed as a tabletop device his. It can be used to put labels on a label tape printing, the label tape being wound from a roll Carrier tape exists on the crosswise to the longitudinal direction of the tape divided paper sections coated with pressure sensitive adhesive removable are pinned. After printing on the paper sections there is a fixation by means of a toner fusing station that emits pulses in the light infrared flashing area that does not touch the label tape having.

Aus der JP-A-63-173 078 ist es bereits bekannt, eine angefederte Übertragungs-Korona im Bereich einer Bildtrommel zu verwenden. Hier wird mit Hilfe von Abstandsrollen ein Spalt zwischen der Korona und der Trommel konstant gehalten, um eine homogene Bildübertragung zu erreichen. Die bekannte Übertragungsstation führt das zu bedruckende Papier zwischen den Abstandsrollen so, daß sich keine Änderung des Korona-Spalts bei unterschiedlicher Dicke des Papiers ergibt.From JP-A-63-173 078 it is already known a spring-loaded transmission corona to be used in the area of an image drum. Here is with help of spacer rolls a gap between the corona and the drum constant held to achieve a homogeneous image transmission. The well-known Transfer station guides the paper to be printed between the spacer rolls so that there is no change in the corona gap with different Thickness of the paper results.

Ferner ist aus der DE-A-27 54 495 eine Übertragungseinrichtung für ein Kopiergerät bekannt. Hier wird das Druckgut mittels Greifer an der Bildtrommel entlanggeführt. Die Korona-Station ist federnd ausgebildet, um den gegenüber dem Papier dickeren Greifer durchzulassen. Furthermore, DE-A-27 54 495 is a transmission device for a copier known. Here the print material is gripped on the image drum guided along. The corona station is resilient to the opposite allow the gripper to pass through the paper.

Der Erfindung liegt die Aufgabe zugrunde, einen Laserdrucker der im Oberbegriff des Patentanspruchs 1 genannten Art so weiterzubilden, daß mit ihm auch Gut unterschiedlicher Dicke über den Querschnitt verteilt mit einem einwandfreien Druckbild versehen werden kann.The invention has for its object a laser printer in the Preamble of claim 1 mentioned type so that with it well of different thicknesses distributed over the cross-section can be provided with a perfect print image.

Die Lösung der gestellten Aufgabe ist im kennzeichnenden Teil des Patentanspruchs 1 angegeben. Vorteilhafte Ausgestaltungen der Erfindung sind den Unteransprüchen zu entnehmen.The solution to the problem is in the characterizing part of the claim 1 specified. Advantageous embodiments of the invention are can be found in the subclaims.

Ein Laserdrucker nach der Erfindung zeichnet sich dadurch aus, daß die Koronastation so gelagert ist, daß sich je nach Dicke des durchlaufenden, zu bedruckenden Guts der Abstand zwischen Bildtrommel und Koronastation ändert.A laser printer according to the invention is characterized in that the Corona station is stored so that depending on the thickness of the continuous, to be printed goods the distance between image drum and corona station changes.

Hierdurch läßt sich Gut unterschiedlicher Dicke mit dem erfindungsgemäßen Laserdrucker bedrucken, da sich infolge der nachgiebig gelagerten Koronastation der Abstand zwischen Bildtrommel und Koronastation automatisch auf die Dicke des zu bedruckenden Gutes einstellt, wenn dieses in den Bereich zwischen Bildtrommel und Koronastation geführt wird. Manuelle und zeitraubende Voreinstellungen des Abstandes zwischen Bildtrommel und Koronastation können somit entfallen, so daß ein durchgängiger Druckprozeß ausführbar ist, auch wenn sich zwischenzeitlich die Dicke des zu bedruckenden Gutes ändern sollte.As a result, material of different thicknesses can be used with the invention Print on laser printers because the Corona station the distance between image drum and corona station automatically to the thickness of the material to be printed, if this in the area between the image drum and the corona station. manual and time-consuming presetting of the distance between the image drum and corona station can thus be omitted, so that a continuous Printing process is executable, even if the Should change the thickness of the material to be printed.

Dabei kann nach einer vorteilhaften Ausgestaltung der Erfindung die Koronastation auch um eine in Transportrichtung des zu bedruckenden Guts laufende Achse kippbar sein, um gegebenenfalls Dickenschwankungen des zu bedruckenden Guts, gesehen In Richtung parallel zur Längsachse der Bildtrommel, ausgleichen zu können. Mit anderen Worten wird durch die kippbar gelagerte Koronastation sichergestellt, daß das zu bedruckende Gut über seine gesamte Breite zuverlässig gegen die Oberfläche der Bildtrommel gedrückt wird, wobei die Andruckkraft durch die Koronastation selbst erzeugt wird, die zu diesem Zweck in geeigneter Weise mechanisch vorgespannt ist oder durch Elektromagneteinrichtungen mit gesteuerter Druckkraft.According to an advantageous embodiment of the invention, the corona station can also in the transport direction of the goods to be printed Running axis can be tilted, in order to possibly fluctuate in thickness of the material to be printed, viewed in the direction parallel to the longitudinal axis the image drum to be able to compensate. In other words, through the tiltable corona station ensures that the printable Reliable against the surface of the surface over its entire width Image drum is pressed, the pressing force by the corona station self-generated for this purpose in a suitable mechanical manner is biased or controlled by electromagnetic devices Compressive force.

Die Koronastation ist vorzugsweise plattenförmig ausgebildet, so daß auf Ihrer Oberfläche das zu bedruckende Gut entlanggleiten kann. Dabei befinden sich auf dieser Oberfläche weder Vertiefungen noch Erhöhungen. so daß nicht die Gefahr besteht, daß das zu bedruckende Gut dort Irgendwie festklemmen könnte.The corona station is preferably plate-shaped, so that on The surface of the material to be printed can slide along your surface. Doing so there are no depressions or ridges on this surface. so that there is no danger that the goods to be printed will somehow be there could jam.

Nach einer besonderen Ausgestaltung der Erfindung sind in einer elektrisch isolierenden Platte der Koronastation drei im Abstand parallel zueinander und zur Längsachse der Bildtrommel verlaufende Metallbahnen oder Metalldrähte eingebettet, um eine Übertragung der Tonerpartikel von der Bildtrommel auf das zu bedruckende Gut zu ermöglichen. Die Metallbahnen oder Metalldrähte liegen dabei nicht unmittelbar frei an der Oberfläche der Koronastation, so daß sie durch das zu bedruckende Gut auch nicht beschädigt werden können. An diese Metallbahnen bzw. Metalldrähte werden geeignete elektrische Potentiale angelegt, z. B. eine Hochspannung an die mittlere Metallbahn bzw. den mittleren Metalldraht, und Erdpotential an die beiden äußeren Metallbahnen oder Metalldrähte. Sollten die Metallbahnen bzw. Metalldrähte dennoch in der Oberfläche der elektrisch isolierenden Platte im Abstand nebeneinander liegen, so müßten diese mit der Oberfläche fluchten.According to a special embodiment of the invention in an electrical insulating plate of the corona station three spaced parallel to each other and metal tracks extending to the longitudinal axis of the image drum or embedded metal wires to transfer the toner particles from to enable the image drum on the material to be printed. The metal tracks or metal wires are not directly exposed on the surface the corona station, so that it can also be printed through the material to be printed cannot be damaged. To these metal tracks or metal wires suitable electrical potentials are applied, e.g. B. a high voltage to the middle metal track or the middle metal wire, and earth potential to the two outer metal tracks or metal wires. Should the metal tracks or metal wires nevertheless in the surface of the electrical insulating plate spaced next to each other, so should these are aligned with the surface.

Um zu verhindern, daß das zu bedruckende Gut für den Fall, daß es sich nicht um Endlosbänder handelt, im vorderen Stirnseitenbereich der Koronastation gegen diese anschlägt, ist nach einer weiteren Ausbildung der Erfindung vorgesehen, daß die Koronastation an dieser Stelle mit einer Auflaufschräge für das zu bedruckende Gut versehen ist. Je nach Neigung der Auflaufschräge wird dann der erforderliche Abstand zwischen Blldtrommel und Koronastation automatisch mehr oder weniger schnell eingestellt.To prevent the material to be printed in the event that it is is not an endless belt, in the front area of the corona station against this, after further training is the Invention provided that the corona station at this point with a Ramp is provided for the goods to be printed. Depending on the inclination the run-up slope then becomes the required distance between the image drum and corona station automatically set more or less quickly.

Dabei kann die elektrisch isolierende Platte, in der sich die Metallbahnen bzw. Metalldrähte befinden, auch auf einem plattenförmigen Träger liegen, der seinerseits mit der Auflaufschräge versehen ist. Sollte die mit den elektrischen Leiterbahnen bzw. Metalldrähten versehene elektrisch isolierende Platte zu Schaden kommen, etwa infolge eines elektrischen Durchschlags zwischen den genannten Metallbahnen bzw. Leiterdrähten, so braucht nur diese und nicht die gesamte Koronastation ausgetauscht zu werden, was die Instandsetzungszeit des Laserdruckers verkürzt. Zu diesem Zweck kann die genannte elektrisch isolierende Platte in einfacher Weise, beispielsweise mittels Schrauben, am plattenförmigen Träger befestigt sein. Sie liegt in diesem dazu beispielsweise in einer geeignet ausgebildeten Ausnehmung.It can be the electrically insulating plate in which the metal tracks or metal wires are also lying on a plate-shaped carrier, which in turn is provided with the ramp. Should the one with the electrical conductor tracks or metal wires provided electrically insulating Plate may be damaged, for example as a result of an electrical breakdown between said metal tracks or conductor wires, so only needs this and not the entire corona station to be replaced what shortens the repair time of the laser printer. To this Purpose can be the said electrically insulating plate in simpler Way, for example by means of screws, attached to the plate-shaped carrier his. For this purpose, it lies, for example, in a suitably designed one Recess.

Die Koronastation kann nach einer noch weiteren Ausgestaltung der Erfindung auf Parallelführungen verschiebbar gehalten sein, die in Transportrichtung des zu bedruckenden Guts gesehen im vorderen und hinteren Bereich der Koronastation angeordnet sein können. Hierdurch wird eine relativ leichtgängige Verschiebung der Koronastation beim Auflaufen des zu bedruckenden Guts auf die Auflaufschräge und beim Einlaufen in den Spalt zwischen Koronastation und Bildtrommel gewährleistet.The corona station can, according to yet another embodiment of the invention be held displaceably on parallel guides in the direction of transport of the goods to be printed seen in the front and rear Area of the corona station can be arranged. This will create a relatively easy movement of the corona station when it comes up of the goods to be printed on the ramp and when entering ensures the gap between the corona station and the image drum.

Dabei kann die Koronastation durch Federn in Richtung der Bildtrommel vorgespannt sein, etwa durch Druckfedern, die gegen ihre Unterseite drücken und sich am Gehäuse des Laserdruckers abstützen.The corona station can be springs in the direction of the image drum be biased, such as by compression springs against their underside press and support yourself on the housing of the laser printer.

Alternativ kann zu diesem Zweck aber auch ein gewichtsbelasteter Hebelarm vorgesehen sein, der mit seinem freien Ende in Richtung der Bildtrommel drückt und somit von unten die Koronastation auf die Bildtrommel zubewegt. Gegenüber der Federlösung ergibt sich hier der Vorteil, daß unabhängig von der Dicke des zu bedruckenden Guts eine näherungsweise immer gleichmäßige Andruckkraft erhalten wird.Alternatively, a weight-loaded lever arm can also be used for this purpose be provided with its free end in the direction of the image drum presses and thus moves the corona station towards the image drum from below. Compared to the spring solution, the advantage here is that it is independent approximately always of the thickness of the material to be printed uniform pressure force is obtained.

Nach einer noch anderen Ausgestaltung der Erfindung sind die freien Enden der Parallelführungen bzw. des Hebelarms über parallel zur Transportrichtung des zu bedruckenden Guts liegende Achsen mit der Koronastation gekoppelt. Hierdurch wird ein relativ einfach aufgebauter Hebelund Andruckmechanismus für die Koronastation zur Verfügung gestellt. Dabei kann die Kopplung auch über jeweils ein Lager erfolgen, so daß eine reibungsarme Kippung möglich ist. Als Lager können Kugellager. Wälzlager, Nadellager, usw., zum Einsatz kommen.According to yet another embodiment of the invention, the free ends the parallel guides or the lever arm via parallel to the transport direction axes of the material to be printed with the corona station coupled. This results in a relatively simple lever arm Pressure mechanism provided for the corona station. The coupling can also take place via a respective bearing, so that one low-friction tipping is possible. Ball bearings can be used as bearings. Roller bearing, Needle bearings, etc., are used.

In Weiterbildung der Erfindung ist die Koronastation zwischen Transportmitteln zum Transport des zu bedruckenden Guts angeordnet, wobei das zu bedruckende Gut mit Hilfe dieser Transportmittel in Richtung zur Koronastation transportiert und auf deren Auflaufschräge gezogen wird. Dabei können die Transportmittel zwei umlaufende Transportriemen (oder aber auch Ketten, und dergleichen) zum Transport des zu bedruckenden Guts aufweisen. Das zu bedruckende Gut kann dabei an einem Rahmen gehalten sein, der entlang zweier paralleler Rahmenlängsseiten auf den Transportmitteln bzw. Transportriemen befestigt ist. Das Befestigen kann z. B. dadurch erfolgen, daß der Rahmen im Bereich seiner Längsseiten auf die Transportmittel bzw. Transportriemen aufgesteckt wird. Dabei laufen die Längsseiten des Rahmens an der Koronastation vorbei. während das zwischen den Längsseiten des Rahmens liegende zu bedruckende Gut auf die Koronastation aufläuft und in den Bereich zwischen Koronastation und Bildtrommel transportiert wird.In a further development of the invention, the corona station is between means of transport arranged to transport the goods to be printed, the Goods to be printed with the help of these means of transport in the direction of the corona station transported and pulled on the ramp. there can the means of transport two circulating belts (or also chains, and the like) for transporting the goods to be printed exhibit. The material to be printed can be held on a frame be along two parallel sides of the frame on the means of transport or transport belt is attached. The attachment can e.g. B. in that the frame in the region of its long sides on the Means of transport or transport belt is attached. The run Long sides of the frame past the corona station. while that between to be printed on the long sides of the frame on the Corona station runs up and into the area between corona station and Image drum is transported.

Das von den Transportmitteln getragende zu bedruckende Gut kann nach einer noch weiteren Ausgestaltung der Erfindung im Bereich vor der Bildtrommel auch an einer Heizstation vorbeigeführt werden, um die in Richtung auf die Bildtrommel weisende Oberfläche des zu bedruckenden Gutes aufzuheizen. Dadurch werden Druckbilder mit noch besserer Qualität auf der Oberfläche des zu bedruckenden Gutes erhalten. Die Voraufheizung der Oberfläche des zu bedruckenden Gutes kann z. B. durch ausgesandte Strahlungsenergie erfolgen, beispielsweise durch Aussendung von Infrarotstrahlung. Hierzu kann die Heizstation eine oder mehrere geeignet ausgebildete Heizlampen aufweisen. Die Voraufheizung der Oberfläche des zu bedruckenden Gutes erfolgt also schon dann, bevor das Gut den Bereich zwischen Bildtrommel und Koronastation erreicht. Schon im Bereich der Bildtrommel erfolgt dann eine Vorfixierung des übertragenen Toners durch die voraufgeheizte Oberfläche des zu bedruckenden Gutes, was die Verbesserung der Druckqualität bewirkt.The goods to be printed, carried by the means of transport, can a still further embodiment of the invention in the area in front of the image drum also be guided past a heating station to the towards surface of the material to be printed, pointing to the image drum heat. This will print images with even better quality the surface of the goods to be printed. The preheating the surface of the goods to be printed z. B. by emitted Radiation energy takes place, for example by emitting infrared radiation. For this purpose, the heating station can have one or more suitably designed ones Have heating lamps. Preheating the surface of the to good is printed before the good reaches the area reached between image drum and corona station. Already in the area of The image drum is then pre-fixed in the transferred toner through the preheated surface of the material to be printed, which the Improves print quality.

Das zu bedruckende Gut kann z. B. durch Markierungselemente gebildet werden, die zu Matten zusammengefaßt sind. Derartige Matten von Markierungselementen sind bereits allgemein bekannt und im Handel erhältlich. Dabei werden die Markierungselemente von einem Rahmen gehalten, der mit seinen Längsseiten auf die bereits erwähnten Transportriemen aufgesteckt wird, die zu diesem Zweck entsprechend abstehende Aufnahmenoppen aufweisen, die in Klemmöffnungen des Rahmens einrasten. Die Markierungselemente können vom Rahmen abgebrochen werden, nachdem sie bedruckt worden sind. Rahmen und Marklerungselemente bestehen dabei vorzugsweise aus Kunststoffmaterial. Sie können z. B. auf Leiterenden aufgesteckt oder aufgeklemmt werden, lassen sich aber auch mit anderen Einrichtungen rastend bzw. klemmend verbinden.The goods to be printed can e.g. B. formed by marking elements be combined into mats. Such mats of marking elements are already well known and commercially available. The marking elements are held by a frame, the one with its long sides on the transport belts already mentioned is plugged on, the studs protruding accordingly for this purpose have, which snap into the clamping openings of the frame. The Marker elements can be broken off from the frame after they have been printed. There are frames and markers preferably made of plastic material. You can e.g. B. on conductor ends can be attached or clamped on, but can also be used connect other devices in a latching or clamping manner.

Die Erfindung wird nachfolgend unter Bezugnahme auf die Zeichnungen im einzelnen erläutert. Es zeigen:

  • Figur 1 einen Laserdrucker im Schnitt;
  • Figur 2 eine Stirnansicht der nachgiebig gelagerten Koronastation des Laserdruckers nach Figur 1;
  • Figuren 3a bis 3d unterschiedliche Matten von Markierungselementen sowie den Aufsetzvorgang der Matten auf Transportriemen des Laserdruckers nach Figur 1;
  • Figur 4 eine Matte von Markierungselementen in perspektivischer Darstellung;
  • Figur 5a eine Seitenansicht einer Koronastation nach einem ersten Ausführungsbeispiel;
  • Figur 5b die Koronastation nach Figur 5a in Stirnansicht;
  • Figur 6a eine Koronastation nach einem zweiten Ausführungsbeispiel; und
  • Figur 6b eine Schnittansicht der Koronastation nach Figur 6a in Richtung der Pfeile A-A'.
    • The invention is explained in detail below with reference to the drawings. Show it:
  • Figure 1 shows a laser printer in section;
  • Figure 2 is an end view of the resiliently mounted corona station of the laser printer of Figure 1;
  • FIGS. 3a to 3d different mats of marking elements as well as the placing process of the mats on transport belts of the laser printer according to FIG. 1;
  • FIG. 4 shows a mat of marking elements in a perspective view;
  • Figure 5a is a side view of a corona station according to a first embodiment;
  • 5b shows the corona station according to FIG. 5a in front view;
  • Figure 6a shows a corona station according to a second embodiment; and
  • Figure 6b is a sectional view of the corona station of Figure 6a in the direction of arrows A-A '.

    • Die Figuren 1 und 2 zeigen den prinzipiellen Aufbau eines Laserdruckers nach der vorliegenden Erfindung. Er trägt das Bezugszeichen 1. Der Laserdrucker 1 kann zu Ansteuerungszwecken mit einem Rechner 2 über eine Schnittstelle 3 verbunden sein, wie allgemein bekannt.Figures 1 and 2 show the basic structure of a laser printer according to the present invention. It bears the reference number 1. The laser printer 1 can be used for control purposes with a computer 2 via a Interface 3 be connected, as is well known.

    Zum Laserdrucker 1 gehört ein Gehäuse 4, in dessen Inneren sich etwa auf halber Höhe eine horizontal angeordnete Trägerplatte 5 für weitere Elemente des Laserdruckers 1 befindet. Auf der Trägerplatte 5 sind eine Koronastation 6 und eine Fixierstation 7 befestigt. Oberhalb der Koronastation 6 sind eine Tonerstation 8, eine Bildtrommel 9, und eine Belichtungsstation 10 zur Belichtung der Bildtrommel 9 vorhanden. Zur Belichtung der Bildtrommel 9 dient ein nicht dargestellter Laser, der in der Belichtungsstation 10 untergebracht ist und datenmäßig vom Rechner 2 angesteuert wird.The laser printer 1 has a housing 4, in the interior of which is approximately open halfway up a horizontally arranged support plate 5 for further elements of the laser printer 1. A corona station is on the carrier plate 5 6 and a fixing station 7 attached. Above the corona station 6 are a toner station 8, an image drum 9, and an exposure station 10 for exposure of the imaging drum 9 available. To expose the Image drum 9 is a laser, not shown, in the exposure station 10 is housed and data controlled by the computer 2 becomes.

    Das Gehäuse 4 des Laserdruckers 1 weist ein Eingangstor 11 und ein Ausgangstor 12 u.a. für im Abstand nebeneinanderliegende Transportriemen 13, 14 auf, von denen jeweils einer um zwei Umlenkrollen 15, 16 herumgeführt ist, von denen eine antreibbar ist. Jeweils zwei dieser Umlenkrollen 15, 15 bzw. 16, 16 befinden sich im Abstand voneinander auf einer gemeinsamenAchse 17, 18. Die beiden Umlenkrollen 15 befinden sich im Abstand vor dem Eingangstor 11 außerhalb des Gehäuses 4 und sind auf einer geeigneten und nicht dargestellten Halterung am Gehäuse 4 über die Achse 17 montiert. Dagegen befinden sich die beiden Umlenkrollen 16 im Abstand hinter dem Ausgangstor 12 außerhalb des Gehäuses 4 und sind ebenfalls mittels einer nicht dargestellten Halterung über die Achse 18 am Gehäuse 4 montiert. Die Umlenkrollen 15, 15 bzw. 16, 16 liegen dabei so, daß die beiden Transportriemen 13, 14 horizontal durch das Gehäuse 4 hindurchbewegt werden, wobei sie einen solchen Abstand voneinander haben, daß sie zwischen sich die Koronastation 6 aufnehmen können.The housing 4 of the laser printer 1 has an entrance gate 11 and an exit gate 12 and others for transport belts lying next to each other at a distance 13, 14, each of which is guided around two deflection rollers 15, 16 one of which is drivable. Two of these pulleys each 15, 15 and 16, 16 are spaced apart on a common axis 17, 18. The two deflection rollers 15 are at a distance in front of the entrance gate 11 outside the housing 4 and are on a suitable and not shown bracket on the housing 4 on the axis 17 mounted. In contrast, the two deflection rollers 16 are at a distance behind the exit gate 12 outside the housing 4 and also by means of a bracket, not shown, on axis 18 Housing 4 mounted. The deflection rollers 15, 15 and 16, 16 are so that the two transport belts 13, 14 horizontally through the housing 4th be moved through, being such a distance from each other have that they can accommodate the corona station 6 between them.

    Dies ist am besten in Figur 2 zu erkennen. Es handelt sich hier um einen Blick vom Eingangstor 11 in Richtung auf das Ausgangstor 12. Zu erkennen sind die beiden Umlenkrollen 16, 16 auf der Achse 18, um die herum die Transportriemen 13, 14 geführt sind. Der Abstand zwischen den Umlenkrollen 16, 16 ist dabei so groß, daß die Koronastation 6 zwischen den Transportriemen 13, 14 angeordnet werden kann.This is best seen in Figure 2. This is one View from the entrance gate 11 towards the exit gate 12. Can be seen are the two deflection rollers 16, 16 on the axis 18, around which the conveyor belts 13, 14 are guided. The distance between the pulleys 16, 16 is so large that the corona station 6 between the Transport belts 13, 14 can be arranged.

    Die Koronastation 6 selbst weist eine ebene Platte 19 auf, die etwa in Höhe der jeweils oben laufenden Transportriemen 13, 14 zu liegen kommt. Diese Platte 19 liegt horizontal und parallel zur Trägerplatte 5 und stützt sich auf dieser ab. Zur Abstützung der Platte 19 auf der Trägerplatte 5 sind zwei Parallelführungen 20, 21 vorgesehen, die z. B. in Form von Teleskopen ausgebildet sind. Um die Parallelführungen 20, 21 herum sind wendelartige Druckfedern 22, 23 angeordnet, die sich an der Trägerplatte 5 einerseits und an der unteren Fläche der ebenen Platte 19 andererseits abstützen und letztere in Richtung zur Bildtrommel drücken. Durch diese Parallelführungen 20, 21 und die zugehörigen Druckfedern 22, 23 wird die ebene Platte 19 nachgiebig auf der Trägerplatte 5 gelagert. Die Platte 19 liegt dabei mit ihrer oberen Fläche auch parallel zur Längsachse der Bildtrommel 9. Dabei weist die ebene Platte 19 an ihrer zum Eingangstor 11 gerichteten Stirnseite eine Auflaufschräge 24 auf, auf die zu bedruckende Gut auflaufen kann, wenn dieses mit Hilfe der Transportriemen 13, 14 In den Bereich zwischen Bildtrommel 9 und Koronastation 6 transportiert wird. Je nach Dicke des zu bedruckenden Gutes wird dabei die Platte 19 mehr oderwenigerwelt nach unten in Richtung zur Trägerplatte 5 gedrückt, wodurch sich automatisch der Spalt zwischen Bildtrommel 9 und der ebenen Platte 19 auf die Dicke des zu bedruckenden Gutes einstellt.The corona station 6 itself has a flat plate 19, which is approximately in height the transport belt 13, 14 running at the top comes to rest. This Plate 19 is horizontal and parallel to the support plate 5 and is supported on this off. To support the plate 19 on the support plate 5 are two Parallel guides 20, 21 are provided, the z. B. in the form of telescopes are trained. Around the parallel guides 20, 21 are helical Compression springs 22, 23 arranged on the carrier plate 5 on the one hand and support on the lower surface of the flat plate 19 on the other hand and push the latter towards the imaging drum. Through these parallel guides 20, 21 and the associated compression springs 22, 23 becomes the plane Plate 19 resiliently mounted on the carrier plate 5. The plate 19 is there with its upper surface also parallel to the longitudinal axis of the image drum 9. In this case, the flat plate 19 faces the one facing the entrance gate 11 On the end face a run-up slope 24, onto which goods to be printed run up can, if this with the help of the transport belt 13, 14 in the area is transported between image drum 9 and corona station 6. Depending on The thickness of the material to be printed is more or less the plate 19 pressed down towards the support plate 5, whereby automatically the gap between the image drum 9 and the flat plate 19 to the thickness of the goods to be printed.

    Wie die Figur 2 erkennen läßt, liegen die beiden Parallelführungen hintereinander in Transportrichtung des zu bedruckenden Gutes bzw. mittig zur ebenen Platte 19. Dabei schaut man in Figur 2 auf die Auflaufschräge 24 der ebenen Platte 19.As can be seen in FIG. 2, the two parallel guides lie one behind the other in the transport direction of the goods to be printed or in the center of the flat plate 19. In FIG. 2, one looks at the ramp 24 the flat plate 19.

    In Figur 1 ist die Transportrichtung des zu bedruckenden Gutes mit dem Pfeil 25 angedeutet. In dieser Richtung erstreckt sich die ebene Platte 19 der Koronastation 6 bis hinter die Bildtrommel 9, wobei die Auflaufschräge 24 kurz vor der Bildtrommel 9 endet. Tragen die Transportriemen 13, 14 kein zu bedruckenden Gut, so liegen Bildtrommel 9 und ebene Platte 19 in einem vorbestimmten Abstand zueinander und berühren sich nicht. Läuft dagegen zu bedruckendes Gut auf die Auflaufschräge 24 auf, wird die ebene Platte 19 schon zu diesem Zeitpunkt ein wenig in Richtung zur Trägerplatte 5 gedrückt und anschließend dann noch weiter, wenn das zu bedruckende Gut in den Bereich zwischen Bildtrommel 9 und ebener Platte 19 einläuft.In Figure 1, the transport direction of the goods to be printed with the Arrow 25 indicated. The flat plate 19 extends in this direction the corona station 6 to behind the image drum 9, the run-up slope 24 ends shortly before the image drum 9. Wear the conveyor belts 13, 14 no good to be printed, image drum 9 and flat plate 19 are in a predetermined distance from each other and do not touch. Running on the other hand, the material to be printed on the ramp 24 becomes the level Plate 19 already a little towards the carrier plate at this time 5 pressed and then continue when the printable Good in the area between image drum 9 and flat plate 19 arrives.

    Die Tonerstation 8, die Bildtrommel 9 und die Belichtungsstation 10 arbeiten in der bekannten Weise, und ebenso die Fixierstation 4, wie dies aus der bereits genannten DE 40 18 025 A1 bekannt ist. Die Flxierstation 7 weist dabei eine hochenergetisch arbeitende Blitzlichtlampe 26 zur Fixierung des Tonerbildes auf, das mittels der Bildtrommel 9 auf das zu bedruckende Gut aufgebracht worden ist. Dabei durchlaufen die Transportriemen 13, 14 auch die Fixierstation 7 und führen dabei das zu bedruckende Gut durch diese hindurch. The toner station 8, the imaging drum 9 and the exposure station 10 work in the known way, as well as the fuser 4, like this from the already mentioned DE 40 18 025 A1 is known. The fixation station 7 has a high-energy flash lamp 26 for fixation of the toner image, which is to be printed on by means of the image drum 9 Has been applied well. The conveyor belts go through this 13, 14 also the fixing station 7 and in doing so carry out what is to be printed Good through this.

    Zur Übertragung des Tonerbildes von der Bildtrommel 9 auf das zu bedruckende Gut befinden sich in der ebenen Platte 19 wenigstens 3 im Abstand parallel verlaufende Leiterbahnen, die der Bildtrommel 9 gegenüberliegen und parallel zu deren Längsachse verlaufen. Beispielsweise kann an die mittlere dieser Leiterbahnen eine Hochspannung angelegt werden, während an die beiden äußeren Leiterbahnen Erdpotential zu liegen kommt. Auf diese Weise wird ein hohes elektrisches Feld im Spaltbereich zwischen Bildtrommel 9 und Koronastation 6 erzeugt, das zur Übertragung der Tonerpartikel von der Bildtrommel 9 auf das zu bedruckende Gut dient. Die genannten Leiterbahnen sind dabei in die Platten 19 eingebettet, die aus elektrisch isolierendem Material besteht, so daß diese Leiterbahnen nicht durch das über die Oberfläche der Platte 19 hinwegleitende zu bedruckende Gut beschädigt werden können.To transfer the toner image from the image drum 9 to the one to be printed Well, there are at least 3 at a distance in the flat plate 19 parallel conductor tracks which lie opposite the image drum 9 and run parallel to their longitudinal axis. For example a high voltage can be applied to the middle of these conductor tracks while earth potential lies on the two outer conductor tracks comes. In this way there is a high electric field in the gap area generated between image drum 9 and corona station 6, for transmission the toner particles from the image drum 9 onto the one to be printed Serves well. The conductor tracks mentioned are embedded in the plates 19, which consists of electrically insulating material, so that these conductor tracks not by the one leading over the surface of the plate 19 Good to be printed can be damaged.

    Das zu bedruckende Gut wird im Bereich der Umlenkrollen 15, 15 auf die Transportriemen 13, 14 aufgelegt und im Bereich der Umlenkrollen 16, 16 wieder von den Transportriemen 13, 14 abgegeben bzw. einer weiteren Station zugeführt. Dabei kann zwischen den Umlenkrollen 15, 15 und dem Gehäuse 4 oder an anderer Stelle im Gehäuse in Transportrichtung vor der Tonerstation liegend eine Heizstation 27 vorgesehen sein. Diese Heizstation 27 mit zugehöriger Ansteuerung dient dazu, die zu bedruckende Oberfläche des auf den Transportriemen 13, 14 liegenden zu bedruckenden Gutes voraufzuheizen, um ein sauberes Druckbild zu erhalten. Die Voraufheizung erfolgt dabei mit Hilfe von z. B. zwei Heizlampen 28, die kurzwelliges Infrarotlicht aussenden. Der Betrieb der Heizlampen 28 kann durch Grenzschalter 29 gesteuert werden, die in Transportrichtung des zu bedruckenden Gutes innerhalb der Heizstation 27 hintereinanderliegend angeordnet sind. Diese Grenzschalter werden durch das zu bedruckende Gut beaufschlagt und lassen die Heizlampen 28 solange arbeiten, solange sich noch zu bedruckendes Gut innerhalb der Heizstation 27 befindet.The material to be printed is in the region of the deflection rollers 15, 15 on the Transport belts 13, 14 placed and in the area of the deflection rollers 16, 16 released from the conveyor belts 13, 14 or another station fed. It can between the pulleys 15, 15 and Housing 4 or elsewhere in the housing in the transport direction in front of the A heating station 27 may be provided lying down on the toner station. This heating station 27 with associated control serves to print the surface of the goods to be printed lying on the transport belts 13, 14 preheat to get a clean print image. The preheating takes place with the help of z. B. two heating lamps 28, the short-wave Send out infrared light. The operation of the heating lamps 28 can by Limit switches 29 are controlled, which are to be printed in the transport direction Good things lying one behind the other within the heating station 27 are arranged. These limit switches are marked by the one to be printed Well applied and let the heating lamps 28 work as long as long there is still material to be printed within the heating station 27.

    Die Figuren 3a bis 3d zeigen Schnittansichten durch die obenliegenden Bereiche der Transportriemen 13, 14, wobei die Schnitte senkrecht zur Längsrichtung der Transportriemen 13, 14 liegen. Figures 3a to 3d show sectional views through the overhead Areas of the conveyor belts 13, 14, wherein the cuts perpendicular to Longitudinal direction of the conveyor belts 13, 14 are.

    Das zu bedruckende Gut trägt in den Figuren 3a bis 3c das Bezugszeichen 30 und in Figur 3d das Bezugszeichen 31. Es handelt sich hier um aus Kunststoffbestehende Markierungselemente, die an einem Steg 32, 33 befestigt sind, der ebenfalls aus Kunststoffbestehen kann. Dabei lassen sich die Markierungselemente 30, 31 vom jeweiligen Steg 32, 33 abbrechen. Mehrere parallele Stege 32, 33 sind an ihren gegenüberliegenden Enden mit Längsleisten 34, 35 verbunden, die hohlprofilartig ausgebildet und nach unten offen sind. Mit diesen nach unten offenen und hohlprofilartig ausgebildeten Längsleisten 34, 35 lassen sich die jeweiligen Rahmen auf Mitnehmer 36, 37 aufsetzen, die an den Jeweiligen Transportriemen 13, 14 befestigt sind und von diesen nach oben bzw. außen abstehen. Der Aufsetzvorgang ist in den Figuren 3a bis 3c für den Rahmen 32, 34, 35 dargestellt. Der Rahmen 33, 34, 35 wird in gleicher Weise aufgesetzt und trägt lediglich andere Markierungselemente 31. Die zu bedruckenden Oberflächen der Markierungselemente 30, 31 liegen in den Figuren 3a bis 3d oben und kommen somit in Kontakt mit der Umfangsfläche der Bildtrommel 9.The material to be printed bears the reference symbol in FIGS. 3a to 3c 30 and in FIG. 3d the reference number 31 Plastic existing marking elements, which are attached to a web 32, 33 are, which can also consist of plastic. Doing so cancel the marking elements 30, 31 from the respective web 32, 33. A plurality of parallel webs 32, 33 are at their opposite ends connected with longitudinal strips 34, 35 which are formed like a hollow profile and are open at the bottom. With these open at the bottom and like a hollow profile trained longitudinal strips 34, 35, the respective frame Place drivers 36, 37 on the respective conveyor belts 13, 14 are attached and protrude from these upwards or outwards. The placement process is shown in Figures 3a to 3c for the frame 32, 34, 35. The frame 33, 34, 35 is placed and supported in the same way only other marking elements 31. The surfaces to be printed of the marking elements 30, 31 lie at the top in FIGS. 3a to 3d and thus come into contact with the peripheral surface of the image drum 9.

    Die Figur 4 läßt eine Matte aus Markierungselementen 30' erkennen, die an einem Rahmen 32, 34, 35 befestigt sind, der ähnlich dem in den Figuren 3a bis 3c dargestellten Rahmen ausgebildet ist. Die Längsleisten 34, 35 der jeweils in den Figuren 3a bis 3c, 3d und 4 gezeigten Rahmen sind immer In der gleichen Weise ausgebildet, so daß sie sich alle auf die Transportriemen 13, 14 aufsetzen lassen. Lediglich die zwischen den Längsleisten 34, 35 gehaltenen Markierungselemente 30, 31 bzw. 30', die jeweils an den Querstegen 32 gehalten sind, können eine unterschiedliche Dicke aufweisen. Dennoch lassen sich sämtliche Markierungselemente mit dem erfindungsgemäßen Laserdrucker bedrucken, da dieser in Abhängigkeit von der Dicke der Markierungselemente die Position der ebenen Platte 19 der Koronastation 6 verschieben kann.FIG. 4 shows a mat made of marking elements 30 'which are attached to a frame 32, 34, 35, which is similar to that in Figures 3a to 3c frame is formed. The longitudinal strips 34, 35 of Frames shown in FIGS. 3a to 3c, 3d and 4 are always In trained in the same way so that they are all on the conveyor belt 13, 14 put on. Only the between the longitudinal strips 34, 35 held marking elements 30, 31 and 30 ', each on the Cross bars 32 are held, can have a different thickness. Nevertheless, all the marking elements can be made with the invention Print laser printers, as this depends on the thickness of the marking elements, the position of the flat plate 19 of the Corona station 6 can move.

    Die Figuren 5a und 5b zeigen in Seitenansicht und Stirnansicht ein anderes Ausführungsbeispiel einer Koronastation 6. Gleiche Element wie in den Figuren 1 und 2 sind dabei mit den gleichen Bezugszeichen versehen und werden nicht nochmals beschrieben. Figures 5a and 5b show another side view and front view Embodiment of a corona station 6. Same element as in Figures 1 and 2 are provided with the same reference numerals and will not be described again.

    Im Gegensatz zur Koronastation nach Figur 1 liegt hier die ebene Platte 19, in die die Metalleitungen bzw. Koronadrähte eingebettet sind, auf einer Trägerplatte 38, die ihrerseits über die teleskopartig ausgebildeten Parallelführungen 20, 21 relativ zur Trägerplatte 5 verschiebbar ist. Die Trägerplatte 38 ist mit der Auflaufschräge 24 verbunden, so daß eine Ausnehmung 39 erhalten wird, in die sich die ebene Platte 19 einsetzen läßt. Bei Beschädigung der ebenen Platte 19 kann diese leicht ausgetauscht werden, ohne das eine größere Demontage der Koronastation erforderlich ist. Zu diesem Zweck läßt sich die Platte 19 in einfacher Weise von der Trägerplatte 38 abnehmen, mit der sie z. B. verklemmt oder verschraubt sein kann.In contrast to the corona station according to FIG. 1, the flat plate 19 lies here, in which the metal lines or corona wires are embedded, on a Carrier plate 38, which in turn on the telescopic parallel guides 20, 21 is displaceable relative to the carrier plate 5. The carrier plate 38 is connected to the ramp 24, so that a recess 39 is obtained, in which the flat plate 19 can be used. at Damage to the flat plate 19 can be easily replaced, without having to disassemble the corona station. For this purpose, the plate 19 can be easily removed from the carrier plate 38 decrease with which she z. B. jammed or screwed can.

    Die Trägerplatte 38 wird darüber hinaus durch zwei Druckfedern 40, 41 von der Trägerplatte 5 weggedrückt, um das zu bedruckende Gut gegen die Bildtrommel 9 pressen zu können. Dabei liegen die Druckfedern 40, 41 im Abstand zueinander auf einer Linie, die parallel zur Längsachse der Bildtrommel 9 verläuft.The carrier plate 38 is also by two compression springs 40, 41st pushed away from the carrier plate 5 to the material to be printed against the To be able to press image drum 9. The compression springs 40, 41 are in the Distance to each other on a line parallel to the longitudinal axis of the imaging drum 9 runs.

    Ein weiteres Ausführungsbeispiel einer Koronastation 6 ist in Figuren 6a und 6b gezeigt. Dabei stellt die Figur 6b eine Ansicht entlang der Pfeile A-A' von Figur 6a dar.Another exemplary embodiment of a corona station 6 is shown in FIGS. 6a and 6b. 6b shows a view along the arrows A-A ' of Figure 6a.

    Bei diesem Ausführungsbeispiel befindet sich auf der Trägerplatte 5 des Gehäuses 4 eine weitere Bodenplatte 42, die auf der Trägerplatte 5 montierbar ist und die Basis für die Koronastation 6 bildet. Auf der Bodenplatte 42 sind in Transportrichtung des zu bedruckenden Gutes im Abstand hintereinander zwei Parallelführungen 20, 21 angeordnet, die jeweils teleskopartig ausgebildet sind. Jede der Parallelführungen 20, 21 enthält eine Hülse 43, 44, die an der Bodenplatte 42 befestigt ist, sowie eine in der jeweiligen Hülse 43, 44 gleitend geführte Achse 45, 46, wobei die Achsen 45, 46 über ihre freien Stirnenden einen plattenförmigen Träger 47 tragen. Die Verbindung zwischen den Achsen 45, 46 und dem Träger 47 kann dabei mit einem solchen Spiel ausgeführt sein, daß der Träger 47 noch um eine Achse leicht kippbar ist, die parallel zur Transportrichtung des zu bedruckenden Gutes liegt, also horizontal in der Zeichenebene in Figur 6a.In this embodiment, is on the carrier plate 5 of the Housing 4 a further base plate 42, which can be mounted on the carrier plate 5 and forms the basis for the corona station 6. On the bottom plate 42 are at a distance in the transport direction of the material to be printed Two parallel guides 20, 21 arranged one behind the other, each telescopically are trained. Each of the parallel guides 20, 21 contains one Sleeve 43, 44, which is fixed to the bottom plate 42, and one in the respective Sleeve 43, 44 slidably guided axes 45, 46, the axes 45, 46 wear a plate-shaped carrier 47 over their free ends. The Connection between the axes 45, 46 and the carrier 47 can be carried out with such a game that the carrier 47 is still one Axis is easily tilted, which is parallel to the transport direction of the print Good lies, that is, horizontally in the plane of the drawing in FIG. 6a.

    Der Träger 47 weist an seiner vorderen Stirnseite eine Auflaufschräge 48 auf, auf die das zu bedruckende Gut aufläuft, bevor es die Bildtrommel 9 erreicht. In Transportrichtung des zu bedruckenden Gutes hinter der Auflaufschräge 48 schließt sich unmittelbar eine Ausnehmung 49 an, in der die bereits erwähnte elektrisch isolierende Platte 19 zu liegen kommt. In ihr befinden sich die drei bereits genannten Metallbahnen bzw. Metalldrähte 50, 51 und 52 zur Erzeugung eines starken elektrischen Feldes für die Übertragung der Tonerpartikel von der Bildtrommel 9 auf das zu bedruckende Gut. Die Metalldrähte 50, 51 und 52 sind mit einem Anschlußkabel 53 verbunden, über das die entsprechenden Potentiale zugeführt werden.The carrier 47 has a run-up slope 48 on its front face on which the material to be printed comes up before it reaches the image drum 9 reached. In the direction of transport of the goods to be printed behind the ramp 48 is immediately followed by a recess 49 in which the already mentioned electrically insulating plate 19 comes to rest. In you will find the three metal tracks or metal wires already mentioned 50, 51 and 52 for generating a strong electric field for the transfer of the toner particles from the image drum 9 to the one to be printed Good. The metal wires 50, 51 and 52 are with a connecting cable 53 connected via which the corresponding potentials are supplied become.

    Um den plattenförmigen Träger 47 und mit ihm die ebene Platte 19 in Richtung zur Bildtrommel 9 drücken zu können, ist ein Hebel 54 vorgesehen, der sich an einer Zwischenposition drehbar an einem Lagerbock 55 abstützt, welcher auf der Bodenplatte 42 befestigt ist. Dazu ist eine Achse 56 vorgesehen, die durch den Hebel 54 und durch den Lagerbock 55 hindurchragt. Das vom plattenförmigen Träger 47 wegweisende Ende des Hebels 54 ist mit einem Gewicht 57 verbunden, das in Längsrichtung des Hebels 54 verschiebbar ist. Das Gewicht 57 ist somit bestrebt, den Hebel 54 im Uhrzeigersinn um die Achse 56 In Figur 6b zu drehen.Around the plate-shaped carrier 47 and with it the flat plate 19 in To be able to press towards the image drum 9, a lever 54 is provided, which rotates at an intermediate position on a bearing block 55 supports which is attached to the bottom plate 42. There is an axis for this 56 is provided, which protrudes through the lever 54 and through the bearing block 55. The end of the lever pointing away from the plate-shaped carrier 47 54 is connected to a weight 57 which is in the longitudinal direction of the lever 54 is displaceable. The weight 57 therefore strives to lift the lever 54 to rotate clockwise around axis 56 in Figure 6b.

    Das andere und kürzere Ende des Hebels 54 trägt seitlich ein Kugellager 58, dessen Drehachse parallel zur Achse 56 verläuft und in Transportrichtung des zu bedruckenden Gutes liegt. Beispielsweise könnte der Hebel 54 mit dem Innenkranz des Kugellagers 58 verbunden sein. Der Außenkranz des Kugellagers 58 ist dann mit einem Ansatz 59 verbunden, der an der Unterseite des plattenförmigen Trägers 47 befestigt ist.The other and shorter end of the lever 54 laterally carries a ball bearing 58, whose axis of rotation runs parallel to axis 56 and in the transport direction of the goods to be printed. For example, the lever 54 could be connected to the inner ring of the ball bearing 58. The outer wreath of the ball bearing 58 is then connected to a shoulder 59 which at the Underside of the plate-shaped carrier 47 is attached.

    Wird der Hebel 54 durch das Gewicht 57 im Uhrzeigersinn um die Achse 56 gedreht, so wird dabei der plattenförmigen Träger 47 und mit ihm die Platte 19 in Richtung zur Bildtrommel 9 bewegt. Infolge des Kugellagers 58 zwischen dem Hebel 54 und dem Träger 47 kann letzterer auch noch um die Achse 60 des Kugellagers 58 gekippt werden. Die Kippung darf allerdings nicht größer sein als das Spiel, das im Bereich zwischen den Parallelführungen 20, 21 und dem Träger 47 vorhanden ist. Für den Fall größerer Kippungen müßten auch im Bereich der Parallelführungen 20, 21 Gelenke für den Träger 47 vorhanden sein. Da andererseits die Verschwenkbewegungen des Hebels 54 nicht so groß sind, braucht auch kein besonderes Spiel zwischen den jeweiligen Hülsen und Achsen der Parallelführungen vorhanden zu sein. Durch den Hebelmechanismus 54 bis 57 wird somit erreicht, daß in dem hier relevanten Verschiebebereich des Trägers 47 dieser immer mit relativ konstanter Andruckkraft in Richtung zur Bildtrommel 9 vorgespannt wird, und zwar unabhängig von der Dicke des zu bedruckenden Gutes.The lever 54 is rotated clockwise about the axis 56 by the weight 57 rotated, the plate-shaped carrier 47 and with it the plate 19 moved towards the image drum 9. As a result of the ball bearing 58 between the lever 54 and the carrier 47 the latter can also the axis 60 of the ball bearing 58 can be tilted. However, the tipping is allowed not be bigger than the game in the area between the parallel guides 20, 21 and the carrier 47 is present. In case bigger Tilting would also have 20, 21 joints in the area of the parallel guides be present for the carrier 47. On the other hand, the pivoting movements the lever 54 are not so large, does not need anything special Play between the respective sleeves and axes of the parallel guides to be present. The lever mechanism 54 to 57 thus achieves that in the relevant displacement range of the carrier 47 this always with a relatively constant pressure force in the direction of the image drum 9 is biased, regardless of the thickness of the print Good.

    Claims (18)

    1. Laser printer (1), in which print carrier (30, 30', 31) is led through in the region between an image drum (9) and a corona station (6) located opposite the latter, characterized in that the corona station (6) is mounted in such a way that the distance between the image drum and the corona station changes according to the thickness of the print carrier running through.
    2. Laser printer according to Claim 1, characterized in that the corona station (6) is tiltable about an axis (60) running in the direction of transport of the print carrier.
    3. Laser printer according to Claim 1 or 2, characterized in that the corona station (6) has a plate-shaped design.
    4. Laser printer according to Claim 3, characterized in that three metal tracks or metal wires (50, 51, 52) running at a distance from and parallel to one another and to the longitudinal axis of the image drum (9) are embedded in an electrically insulating plate (19) of the corona station (6).
    5. Laser printer according to one of Claims 1 to 4, characterized in that the corona station (6) is provided with a run-on slope (24, 48) for the print carrier.
    6. Laser printer according to Claim 4 or 5, characterized in that the electrically insulating plate (19) of the corona station (6) lies on a plate-shaped carrier (38, 47) which is itself provided with the run-on slope (24, 48).
    7. Laser printer according to one of Claims 1 to 6, characterized in that the corona station (6) is held displaceably on parallel guides (20, 21).
    8. Laser printer according to Claim 7, characterized in that the corona station (6) is prestressed in the direction of the image drum (9) by means of springs (22, 23; 40, 41).
    9. Laser printer according to Claim 7, characterized in that the corona station (6) can be pressed in the direction of the image drum (9) by a weight-loaded lever arm (54).
    10. Laser printer according to Claim 7, 8 or 9, characterized in that the free ends of the parallel guides (20, 21) and/or of the lever arm (54) are coupled to the corona station (6) via shafts (60) lying parallel to the direction of transport of the print carrier.
    11. Laser printer according to Claim 10, characterized in that coupling takes place in each case via a bearing (58).
    12. Laser printer according to one of Claims 1 to 11, characterized in that the corona station (6) is arranged between transport means (13, 14) for the transport of the print carrier.
    13. Laser printer according to Claim 12, characterized in that the transport means have two rotating transport belts (13, 14) for the transport of the print carrier.
    14. Laser printer according to Claim 12 or 13, characterized in that the transport means or transport belts have provided on them drivers (36), to which the frame (32, 34, 35) of the print carrier can be fastened.
    15. Laser printer according to Claim 12, 13 or 14, characterized in that the print carrier carried by the transport means (13, 14) can be led past a heating station (27) in the region upstream of the image drum (9).
    16. Laser printer according to Claim 15, characterized in that the heating station (27) emits radiant energy.
    17. Laser printer according to Claim 16, characterized in that the heating station (27) emits infrared radiation.
    18. Use of a laser printer according to one of Claims 1 to 17 for the printing of print carrier consisting of marking elements (30, 30', 31) combined into mats.
    EP98111231A 1997-06-20 1998-06-18 Laser printer Expired - Lifetime EP0886194B1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    DE1997126236 DE19726236C2 (en) 1997-06-20 1997-06-20 laser
    DE19726236 1997-06-20

    Publications (2)

    Publication Number Publication Date
    EP0886194A1 EP0886194A1 (en) 1998-12-23
    EP0886194B1 true EP0886194B1 (en) 2003-03-05

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    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP98111231A Expired - Lifetime EP0886194B1 (en) 1997-06-20 1998-06-18 Laser printer

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    EP (1) EP0886194B1 (en)
    AT (1) ATE233913T1 (en)
    DE (2) DE19758483C2 (en)

    Families Citing this family (3)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    DE202010005767U1 (en) * 2010-04-16 2011-09-23 Weidmüller Interface GmbH & Co. KG transport unit
    DE202012101998U1 (en) 2012-05-31 2013-09-02 Weidmüller Interface GmbH & Co. KG Printer with a separating device
    DE102013105372A1 (en) * 2013-05-24 2014-11-27 Weidmüller Interface GmbH & Co. KG Apparatus and method for generating a three-dimensional image of an object

    Family Cites Families (10)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    BE759452A (en) * 1969-11-28 1971-05-26 Xerox Corp TRANSFER DEVICE
    JPS5373139A (en) * 1976-12-13 1978-06-29 Ricoh Co Ltd Transfer device
    DE2849233C2 (en) * 1978-11-13 1982-12-09 Olympia Werke Ag, 2940 Wilhelmshaven Electrophotographic copier with a transfer device for transferring a toner image onto an image receiving material
    AU8200482A (en) * 1981-01-26 1982-08-16 Am International Inc. Magnetic toner transfer method and apparatus
    JPS60254172A (en) * 1984-05-31 1985-12-14 Fuji Xerox Co Ltd Electric field transfer method and transfer device
    JPS63173078A (en) * 1987-01-12 1988-07-16 Nec Corp Transfer mechanism for electrophotographic recorder
    JPH03200981A (en) * 1989-12-28 1991-09-02 Asahi Optical Co Ltd Accelerating mechanism for retreating recording paper of printer using continuous recording paper
    DE4018025A1 (en) * 1990-06-05 1991-12-12 Computer Systeme Und Automatio ENDLESS LASER LABEL PRINTER
    US5640659A (en) * 1995-10-17 1997-06-17 Hewlett-Packard Company Dry powder or liquid toner image transfixing system
    DE19541061C1 (en) * 1995-11-03 1996-11-07 Siemens Nixdorf Inf Syst Electrophotographic printer with compensating device esp. ED1 printer station with web tension

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    DE59807356D1 (en) 2003-04-10
    EP0886194A1 (en) 1998-12-23
    DE19758483A1 (en) 1998-12-24
    DE19758483C2 (en) 2001-03-29
    ATE233913T1 (en) 2003-03-15

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