EP0855051B1 - Imprimante electrographique a dispositif corona reglable - Google Patents

Imprimante electrographique a dispositif corona reglable Download PDF

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Publication number
EP0855051B1
EP0855051B1 EP96920719A EP96920719A EP0855051B1 EP 0855051 B1 EP0855051 B1 EP 0855051B1 EP 96920719 A EP96920719 A EP 96920719A EP 96920719 A EP96920719 A EP 96920719A EP 0855051 B1 EP0855051 B1 EP 0855051B1
Authority
EP
European Patent Office
Prior art keywords
photoconductor
width
corona
case
web
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
EP96920719A
Other languages
German (de)
English (en)
Other versions
EP0855051A1 (fr
Inventor
Walter Kopp
Heinz John
Otto Olbrich
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.)
Canon Production Printing Germany GmbH and Co KG
Original Assignee
Oce Printing Systems 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 DE1995137610 external-priority patent/DE19537610C1/de
Application filed by Oce Printing Systems GmbH and Co KG filed Critical Oce Printing Systems GmbH and Co KG
Publication of EP0855051A1 publication Critical patent/EP0855051A1/fr
Application granted granted Critical
Publication of EP0855051B1 publication Critical patent/EP0855051B1/fr
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
    • G03G15/02—Apparatus for electrographic processes using a charge pattern for laying down a uniform charge, e.g. for sensitising; Corona discharge devices
    • G03G15/0275—Arrangements for controlling the area of the photoconductor to be charged
    • 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
    • G03G2215/00362—Apparatus for electrophotographic processes relating to the copy medium handling
    • G03G2215/00443—Copy medium
    • G03G2215/00451—Paper
    • G03G2215/00455—Continuous web, i.e. roll
    • G03G2215/00459—Fan fold, e.g. CFF, normally perforated
    • 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
    • G03G2215/00362—Apparatus for electrophotographic processes relating to the copy medium handling
    • G03G2215/00919—Special copy medium handling apparatus
    • G03G2215/00924—Special copy medium handling apparatus two or more parallel feed paths
    • 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 an electrographic printer a printing unit with a during the printing process a photoconductor provided with a toner image and one at a distance to the photoconductor arranged corona device, which an electrical field for transmission during the printing process the toner image is produced on an endless carrier material, the printer optionally in a first mode first section of the track guided along a transport route of the endless carrier material and in a second operating mode a spaced apart from the first path section, second section of the track led along the transport route can print at the same time.
  • the invention is concerned with a further development of a electrographic printing device for printing on band-shaped Recording media of different bandwidth WO 94/27193.
  • the printing device described there has an electrographic intermediate carrier, for example a photoconductor drum, with a usable width corresponding to the double width format of a standard form according to A4 or letter-size format.
  • they are other units, such as the fuser station, the developer station, the cleaning station etc. to this usable width designed.
  • single-color duplex operation becomes the path of the record carrier during transport turned by the printing device, so that two web sections result:
  • the first line section is the Front of the web of the transfer printing unit of a printing unit opposite, while in a second section of the track the back printed on the web at the same transfer location at the same time becomes.
  • the two-tone simplex mode becomes the web during transport in the printing facility offset in parallel by at least one web width, and the Staggered path sections are placed side by side passed together at the transfer location.
  • image and Text elements printed with a first color At the first Passing the web at the transfer location, image and Text elements printed with a first color; at the second time Passing the web with an offset becomes picture and text elements printed with the second color.
  • the printing device described in WO 94/27193 works according to the principle of electrophotography, with the intermediate carrier a photoconductor is used on which with the help a light source, for example a laser or one LED line, a latent charge pattern corresponding to that printing printed image is applied.
  • a light source for example a laser or one LED line
  • the developer station arranged in the photoconductor becomes color particles transfer a desired color to the photoconductor and colored the charge image with toner particles.
  • To the Developer station connects to the printing unit in which a corona device arranged at a distance from the photoconductor the toner image onto the by means of an electric field between the photoconductor and the corona device Continuous carrier material transfers.
  • Width-adjustable transfer corona are common known. This is how JP-A-4-174480 sees a corona wire adjustable length in front of an electrode roller and an insulator roll is tensioned and together with a non-conductive wire is moved. JP-A-58/172667 shows two given sections where the counter voltage applied to the shielding grid Field width is adjustable. US-A-3578970 shows Corona wires between a fixed block and a sliding block are clamped. The The field width set corresponds to the distance between the two plates attached to the blocks.
  • the electrographic printer according to the invention comprises one first corona device, which during the printing process generates the first electric field whose field width, i.e. the effective width of the electric field applied to the photoconductor acts on the width of the first track section of the to be printed endless support material is adjustable.
  • the effective width of the electric field applied to the photoconductor acts on the width of the first track section of the to be printed endless support material is adjustable.
  • One way to control the field width of the electric field vary use one between the corona devices and the shielding element arranged on the photoconductor, which is made of an electrically insulating material. there generates the corona device over the entire width of the Electric field acting as a photoconductor. During that Endless backing covered portion of the photoconductor is shielded by the endless carrier material, the uncovered section of the photoconductor by the shielding element protected.
  • the shielding element in length parallel to the longitudinal axis of the photoconductor adjustable and can be adjusted to the width of the web section to be printed be adjusted.
  • the field width can be generated by extending or Shorten the wire to the width of the print Path section are adjusted because the field width of the electrical Field determined by the length of the tensioned wire becomes.
  • the field width can be set manually by the operator of the electrographic printer. It is also conceivable by the width of the web section to be printed Detect sensors and the field width of the corona device automatically set to the correct value.
  • first corona device arranged in a juxtaposition second corona device used in the second Operating mode in which two spaced apart Web sections are printed simultaneously generates a second electric field of adjustable field width, that corresponds approximately to the width of the second web section.
  • the Field width of the first corona device in the second operating mode approximately a total width that results from the Widths of the first and second track sections and the distance between the track sections.
  • To the photoconductor in the area between the track sections that is not from the continuous substrate is covered, before the electrical Protecting the field is one between the track sections Shielding device with adjustable shielding width provided. It is particularly advantageous if the shielding width the shielding device the distance between the web sections corresponds to the path sections can be printed across their entire width, on the other hand, the photoconductor is protected from the electrical field is.
  • the shielding device two adjustable parallel to the longitudinal axis of the photoconductor Boom, at the ends facing the photoconductor one made of an electrically insulating material Shielding element is provided.
  • the shielding elements are arranged between the photoconductor and the first corona device and preferably overlap each other.
  • the boom can too this purpose on the adjustable transport devices be provided between the two track sections arranged to transport the first or second web section and before each print job according to the width of the Path section must be positioned.
  • Another One possibility is the use of a shielding device is attached to the frame of the printer and the boom of Hand, for example with the help of a crank, or over actuators automatically parallel to the longitudinal axis of the photoconductor can be adjusted. When using actuators it is also possible to change the width of each track section Detect sensors and the boom with their attached Shielding elements according to the shielding width set automatically.
  • a shielding device is particularly advantageous, the one parallel to the longitudinal axis of the photoconductor in the length corresponding to the distance between the web sections adjustable film made of an electrically insulating Material.
  • the film can be at one end the first adjustable transport device, while the other end is adjustable in one at the second Transport device attached cassette is wound. If the distance between the transport devices is changed, the film is pulled out of the cassette or into the these wound up.
  • Each corona device preferably has one on each side Track section arranged cassette with one in the cassette windable corona wire.
  • the corona wire is on one Slider attached and can be parallel by means of the slider to be stretched to the longitudinal axis of the photoconductor. Determined the developed length of the corona wire the field width of the electric field. It is particularly advantageous if a cleaning device is provided in the cassette which is the corona wire during winding and unwinding the cassette cleans. This cleaning process can, for example performed at the beginning of each printing process become.
  • each has Corona device has its own power supply.
  • the strength of the electric field is attached to the Endless carrier material of the first or second web section adapt.
  • This is especially important when looking at the material properties of the first and second path sections from each other differ and different voltages for high quality printing is required.
  • Such material differences result, for example, from double-sided printing, in which the continuous carrier material as first web section printed on the front, then passed through the fuser and finally as second web section is fed to the printer turned around to print on the back.
  • the fuser change the material properties of the endless carrier material, so the tension must be increased to to be able to produce a high quality print image.
  • the printer has a transport device 10, the continuous carrier material arranged near a printing unit 12 conveyed by the printing unit 12, in which the a photoconductor drum 14, colored with toner Charge image using a corona device (not shown) is transferred to the endless carrier material. Then the endless carrier material becomes a fuser 16 supplied in the still smearable toner image the endless carrier material with the help of pressure and temperature is smudge-proof connected to the endless carrier material.
  • a second deflection unit 20 is in the transport direction seen after the fixing station 16 arranged. This second Deflection unit 20 stacks the printed endless carrier material and can, depending on the selected operating mode, also feed the material to the first deflection unit 18, as will be explained later.
  • Figure 1 shows the printer in a first mode, the Simplex operation, in which a first web section A of the endless carrier material from a stack 22 through the first Deflection unit 18 of the printing unit 12 is supplied. After this Printing transports the transport device 10 den Path section A in the direction of the fixing station 16, in which the Toner image is firmly connected to the endless carrier material.
  • the second deflection unit 20 then stacks the web section A on a second stack 24.
  • Figure 2 shows the printer in a second mode, the Parallel simplex operation in which a first path section A and an adjacent second web section B at the same time through the printing unit 12 and the fixing station 16 is guided and then by the second deflection unit 20 is stacked on two stacks 24 and 26.
  • FIG. 3 shows a third operating mode of the printer, the duplex operation, in which the endless carrier material is printed on the front and back.
  • the endless carrier material in a first web section A starting from a first stack 22 of the printing unit 12 fed.
  • the first web section A passed through the fuser 16 and then through the second deflection unit 20 of the first deflection unit 18 fed.
  • the first deflection unit 18 turns the endless carrier material and move it sideways by at least one Web width, so that now the back of the endless carrier material can be supplied to the printing unit 12.
  • the endless backing material will be used as the second web section B designated.
  • the second path section B has the Pass through printing unit 12 and carries the endless carrier material on the back of a second print, it will the fuser 16 fed to the print image on the Back of the endless carrier material smudge-proof with the surface of the endless carrier material connects.
  • the endless carrier material is in shape of a stack 24 stacked on top of one another.
  • FIG. 4 shows a fourth operating mode, the two-color simplex mode, where the front of the continuous backing first in a first color and with one on it subsequent second print run in a second color is printed.
  • the endless backing material as the first web section A of the printing unit 12 using the first deflection unit 18 supplied.
  • the transport device 10 After printing on the Endless carrier material is transported through the printing unit 12 the transport device 10 the endless carrier material into the fuser 16 to secure the toner image to the continuous backing connect to.
  • the fixing process becomes the endless carrier material by the second Deflection unit 20 again fed to the first deflection unit 18, which the endless carrier material laterally at least one Web width offset to the printing unit 12 passes.
  • second track section B After this Relocation of the endless carrier material by the first deflection unit 18 the portion of the continuous backing is called designated second track section B.
  • This track section B passes through the printing unit 12 in which the second printed image is transferred to the track section B.
  • the transport device 10 conveys the second web section B to the fuser 16. In the fuser 16, this is second printed image fixed on the second web section B, the then through the second deflection unit 20 on a second stack 24 is stacked.
  • Figure 5 shows a side view of a first embodiment a printing unit 30 with a photoconductor drum 32 and a tensioning device 34, which is a web 36 made of endless carrier material against the photoconductor during the printing process 32 preloaded.
  • a transfer location 38 at which the web 36 abuts the photoconductor 32 is parallel to the longitudinal axis of the Photoconductor 32 with a constant distance from it a first Corona device 40 and a second corona device 42 arranged, the first corona device 40 in FIG. 5 cannot be seen.
  • the two corona devices 40 and 42 each have their own adjustable voltage supply (not shown) with the strengths of the corona 40 and 42 generated electric fields independently of the material properties of the Endless carrier material can be adapted.
  • Each of the Corona devices 40 and 42 have one on the frame of the printer attached cassette 44 or 46, in each one Corona wire 48 or 50 is wound.
  • One at the free end each corona wire 48 or 50 attached slide 52 or 54 can be adjusted parallel to the longitudinal direction of the photoconductor 32 be, the corona wire 48 and 50 from the Cassette 44 or 46 is pulled or wound into this.
  • a cleaning device (not shown) in the cassette 44 or 46 cleans the cassette 44 or 46 drawn corona wire 48 or 50.
  • the web 36 is transported by means of a transport device 56 Printing unit 30 passed.
  • the transport device 56 has a total of four caterpillar units 58, 60, 62 and 64, of which however, only the fourth crawler unit 64 can be seen in FIG is the construction of the track units 58, 60 and 62 is like.
  • the crawler unit 64 has one in the direction of transport of the web 36 aligned conveyor belt 66 on a drive wheel 68 larger diameter is drawn and by means of a Clamping wheel 70 of smaller diameter, which is at a distance from the Drive wheel 68 is arranged in alignment with this, below Bias is maintained.
  • a Clamping wheel 70 of smaller diameter On the radially outward facing
  • the surface of the transport belt 66 is several in the transport direction arranged one behind the other at the same distance Transport spikes 72 attached.
  • the transport spikes 72 engage in transport holes 74, which are also in the transport direction with constant distance on the left and right edge of the web 36 are formed.
  • Figures 6 and 7 show the printing unit 30 with the transport device 56 in top view.
  • Figure 6 shows the printing unit 30 during simplex operation, in which an approximate extending over the entire width of the photoconductor drum 32 first web section A of web 36 is printed.
  • the two crawler units 62 and 64 moved laterally outside the printing area and parked there while the two caterpillar units 58 and 60 take over the transport of track section A.
  • the transport spikes 72 of the first and second grip for this purpose Track unit 58 and 60 in on the left and right edges of the Web section A formed transport holes 74.
  • the corona wire 48 becomes the first corona device 40 by means of the slider 52 from the Cassette 44 pulled and at least across the entire width of the section A stretched.
  • the slide 54 of the second corona device 42 is located on the Cassette 46 in which the corona wire 50 is wound, so that the second corona device 42 is not in operation.
  • Figure 7 shows the printing unit 30 during printing two path sections A and B.
  • the first path section A is transported through the first and second crawler units 58 and 60, while the second track section B through the third and fourth crawler units 62 and 64 on the photoconductor drum 32 is passed.
  • the Slider 52 of the first corona device 40 extended so far that the corona wire 48 at least over the entire Width of the first path section A is stretched.
  • the slider 54 of the second corona device 42 is extended so far that the corona wire 50 at least approximately the entire Width of the second track section B spanned.
  • the printing unit 30 it is possible to both in simplex mode as well as in parallel simplex mode, duplex mode or two-color simplex operation of the endless carrier material to print without the surface of the photoconductor drum 32 the electric field of the first and second Corona device 40 or 42 is immediately exposed.
  • FIG 8 shows a second embodiment of a printing unit 80, the a web 82 of an endless carrier material on one Passes photoconductor drum 84.
  • a tensioning device 86 tensions the web 82 against the photoconductor drum 84 before, so that the web 82 at a transfer location 88 abuts the surface of the photoconductor drum 84.
  • Lane 82 On the back of the photoconductor drum 84 facing away Lane 82 is a corona wire 90 at a distance from lane 82 Corona device 92 tensioned in a cassette 94 is wound up and parallel by means of a slider 96 Can be stretched longitudinally to the photoconductor drum 84 (see Figures 9 and 10).
  • Inside the cassette 94 is one Cleaning device (not shown) housed the the corona wire 90 when winding into and during unwinding cleans from the cassette 94.
  • a transport device 98 transports the web 82 on the Photo conductor drum 84 over.
  • the transport device 98 has four crawler units 100, 102, 104 and 106, their respective Construction of the construction of the crawler unit 64 according to FIG. 5 equals, so that a detailed description is dispensed with can be.
  • each of the middle track units 102 and 104 Boom 108 projecting in the direction of the photoconductor drum 84 or 110 screwed to its respective, the photoconductor drum 84 facing end a shielding element 112 or 114 screwed tight from an electrically insulating material which is designed as a rectangular plate.
  • the photoconductor drum 84 in front of the through the corona wire 90 generated electric field are the two shielding elements 112 and 114 between the photoconductor drum 84 and the Corona wire 90 moves with their flat sides facing each other abut each other in the vertical direction and overlap each other as shown in Figure 10.
  • FIG. 9 shows the printing unit 80 in simplex mode, in which a web section A of web 82 is printed, the width of which approximately over the entire width of the photoconductor drum 84 extends.
  • the corona wire becomes 90 with the help of the slide 96 from the cassette 94 of the corona device 92 pulled and parallel to the longitudinal direction of the photoconductor drum 84 running at least approximately over the entire width of the web section A stretched.
  • the two Track units 104 and 106 are in this operating position moved laterally outside the printing area and there parked, the boom 110 is also moved.
  • the transport of the track section A takes place via the crawler unit 100 and 102, which is set to the width of the web section A. with the boom 108 outward from the print area protrudes. With this movement, the two shielding elements 112 and 114 from the gap between the photoconductor drum 84 and the corona wire 90 removed so that over the entire length of the photoconductor drum 84 is uniform electric field is generated.
  • the first path section A is by means of two crawler units 100 and 102 and the second track section B transported by means of the crawler unit 104 and 106.
  • the arms 108 and 110 moved, causing the two shielding elements 112 and 114 brought into a shielding position in which, as already explained above, between the Photoconductor drum 84 and the corona wire 90 are arranged.
  • the corona wire 90 generates over its entire length is a uniform electric field that the toner from the photoconductor drum 84 onto the web sections A or B transmits.
  • the electric field causing an uneven charging the photoconductor drum 84 is prevented.
  • the shielding elements 112 and 114 with the middle caterpillar units 102 and 104 are connected and accordingly at lateral adjustment of the crawler units 104 and 106 are moved, the by the shielding elements 112 and 114 defined shielding width in each position of the crawler units 102 and 104 correspond to the gap S.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Electrostatic Charge, Transfer And Separation In Electrography (AREA)

Claims (8)

  1. Appareil d'impression électrographique comprenant :
    une unité d'impression (12, 80) qui comporte un photoconducteur (14, 84) doté d'une image formée par du toner pendant le processus d'impression et au moins un premier dispositif à effet Corona (92) agencé à distance du photoconducteur (14, 84), lequel dispositif à effet Corona génère pendant le processus d'impression un premier champ électrique de largeur réglable pour transférer l'image formée par du toner sur une matière formant support sans fin,
    ledit appareil d'impression pouvant au choix imprimer simultanément une première section de bande (A) de la matière formant support sans fin, dans un premier mode de fonctionnement, et une seconde section de bande (B) agencée à côté et à distance de la première section de bande (A), dans un second mode de fonctionnement,
    dans le premier mode de fonctionnement, la largeur de champ du premier dispositif à effet Corona (92) étant réglable sur la largeur de la première section de bande (A), et dans le second mode de fonctionnement la première largeur de champ du premier dispositif à effet Corona (92) correspondant approximativement à une largeur totale qui est donnée par la largeur de la première section de bande (A), la largeur de la seconde section de bande (B) et la distance (S) séparant les sections de bande (A, B).
    un dispositif d'écrantage (108, 110, 112, 114) à largeur d'écran réglable étant prévu entre les sections de bande (A, B).
  2. Appareil d'impression électrographique comportant une unité d'impression (12, 30) qui comprend un photoconducteur (14, 32) doté d'une image formée par du toner pendant le processus d'impression et au moins un premier dispositif à effet Corona (40) agencé à distance du photoconducteur (14, 32), lequel dispositif à effet Corona génère pendant le processus d'impression un premier champ électrique de largeur réglable pour transférer l'image formée par du toner sur une matière formant support sans fin,
    ledit appareil d'impression pouvant au choix imprimer simultanément une première section de bande (A) de matière formant support sans fin, dans un premier mode de fonctionnement, et une seconde section de bande (B) agencée à côté et à distance de la première section de bande (A), dans un second mode de fonctionnement,
    dans le premier mode de fonctionnement, la largeur de champ du premier dispositif à effet Corona (40) étant réglable sur la largeur de la première section de bande (A), et avec un second dispositif à effet Corona (42) agencé dans une position adjacente par rapport au premier dispositif à effet Corona (40) et générant, dans le second mode de fonctionnement, pendant le processus d'impression un second champ électrique de largeur réglable qui correspond approximativement à la largeur de la seconde section de bande (B).
  3. Appareil d'impression électrographique selon la revendication 1, dans lequel le dispositif d'écrantage (108, 110, 112, 114) a une largeur d'écran correspondant à la distance (S) séparant les sections de bande (A, B).
  4. Appareil d'impression électrophotographique selon la revendication 3, dans lequel le dispositif d'écrantage comporte deux bras (108, 110) réglables, qui sont parallèles à l'axe longitudinal du photoconducteur (84) et aux extrémités desquels, qui sont dirigées vers le photoconducteur (84), il est prévu un élément d'écrantage (112, 114) constitué d'une matière diélectrique, et dans lequel les éléments d'écrantage (112, 114) sont agencés entre le photoconducteur (84) et le premier dispositif à effet Corona (92), de préférence en se chevauchant.
  5. Appareil d'impression électrographique selon la revendication 3, dans lequel le dispositif d'écrantage est constitué d'une feuille de matière diélectrique parallèle à l'axe longitudinal du photoconducteur et dont la longueur est réglable en correspondance avec la distance séparant les sections de bande (A, B).
  6. Appareil d'impression électrographique selon l'une des revendications précédentes, dans lequel chaque dispositif à effet Corona (40, 42, 92) comporte une cassette (44, 46, 94) agencée latéralement par rapport à chaque section de bande, laquelle cassette (44, 46, 94) comporte un fil métallique à effet Corona (48, 50, 90) pouvant s'enrouler à l'intérieur, et dans lequel le fil métallique à effet Corona (48, 50, 90) peut être tendu parallèlement au photoconducteur (32, 84) au moyen d'une glissière (52, 54, 96) fixée au fil métallique à effet Corona (48, 50, 90), la longueur déroulée du fil métallique à effet Corona (48, 50, 90) déterminant la largeur du champ électrique.
  7. Appareil d'impression électrographique selon la revendication 6, dans lequel il est prévu dans la cassette (44, 46, 94) un dispositif de nettoyage qui nettoie le fil métallique à effet Corona (48, 50, 90) lors de son enroulement dans la cassette (44, 46, 94) et de son déroulement hors de celle-ci.
  8. Appareil d'impression électrographique selon l'une des revendications précédentes, dans lequel chaque dispositif à effet Corona (40, 42, 92) possède son propre dispositif tendeur.
EP96920719A 1995-10-09 1996-06-27 Imprimante electrographique a dispositif corona reglable Expired - Lifetime EP0855051B1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE1995137610 DE19537610C1 (de) 1995-10-09 1995-10-09 Transportband mit Bandspeicher
DE19537610 1995-10-09
DE19540166 1995-10-27
DE19540166 1995-10-27
PCT/DE1996/001145 WO1997014080A1 (fr) 1995-10-09 1996-06-27 Imprimante electrographique a dispositif corona reglable

Publications (2)

Publication Number Publication Date
EP0855051A1 EP0855051A1 (fr) 1998-07-29
EP0855051B1 true EP0855051B1 (fr) 2001-07-04

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EP96920719A Expired - Lifetime EP0855051B1 (fr) 1995-10-09 1996-06-27 Imprimante electrographique a dispositif corona reglable

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US (1) US5987299A (fr)
EP (1) EP0855051B1 (fr)
DE (1) DE59607232D1 (fr)
WO (1) WO1997014080A1 (fr)

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US9042794B1 (en) * 2014-03-18 2015-05-26 Xerox Corporation Method and apparatus for aligning a bias transfer roll
US11584145B2 (en) 2019-02-05 2023-02-21 Hewlett-Packard Development Company, L.P. Tension adjustments in printers to prevent slipping

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Also Published As

Publication number Publication date
WO1997014080A1 (fr) 1997-04-17
EP0855051A1 (fr) 1998-07-29
DE59607232D1 (de) 2001-08-09
US5987299A (en) 1999-11-16

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