EP0602087A1 - Elektrofotografisches simultan-doppeldrucksystem. - Google Patents
Elektrofotografisches simultan-doppeldrucksystem.Info
- Publication number
- EP0602087A1 EP0602087A1 EP92918212A EP92918212A EP0602087A1 EP 0602087 A1 EP0602087 A1 EP 0602087A1 EP 92918212 A EP92918212 A EP 92918212A EP 92918212 A EP92918212 A EP 92918212A EP 0602087 A1 EP0602087 A1 EP 0602087A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- transfer
- printing
- deflection
- recording medium
- transfer belt
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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
- G03G15/22—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20
- G03G15/23—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20 specially adapted for copying both sides of an original or for copying on both sides of a recording or image-receiving material
- G03G15/231—Arrangements for copying on both sides of a recording or image-receiving material
- G03G15/232—Arrangements for copying on both sides of a recording or image-receiving material using a single reusable electrographic recording member
-
- 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
- G03G15/1605—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 at least one intermediate support
-
- 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
Definitions
- the invention relates to a printing or copying machine with two transfer ribbons for simultaneous printing on the front and back of a record carrier.
- GB-A-2040226 electrophotographic printing devices are known in which charge images are generated on a photoconductor with the help of an exposure device and are fed to a developer station. The charge image developed is then mechanically lifted from the photoconductor by means of a belt-shaped transfer element and transferred to a recording medium. In order to be able to fix the toner image on the recording medium, the toner image on the belt-shaped transfer element is heated with the aid of a heating device and the heated toner image is applied to the recording medium by means of pressure and heat via a roller arrangement. After the transfer of the toner image onto the recording medium, the intermediate carrier is cleaned of adhering toner in a cleaning station.
- the object of the invention is to provide a printing or copying device with which two-sided printing of the record carrier is possible in one operation.
- an intermediate carrier e.g. B. a photo conductor drum on which toner images assigned side by side to the front and the back of the recording medium are applied, and by the arrangement of two transfer belts with a corresponding deflection, the recording medium can simultaneously on the front and on the back be printed.
- the device is suitable for processing single sheets as well as continuous paper. Since only one printing system is required, the device is particularly economical and reliable. It can be operated at high speed.
- the recording medium passes through the heat-fixing station only once. This means that the recording medium is only slightly thermally stressed and not deformed.
- the entire device is compact and space-saving. Due to the small printing distance between the front and the back when the toner image is generated, a small memory requirement for the image formation results. Mechanical intermediate storage is thus also possible by extending the transfer belt.
- Figure 1 is a schematic representation of an electrophotographic printing device for simultaneous printing on the front and back of a record carrier
- Figure 2 is a schematic representation of the same device with a deflection device extending the transfer belt for mechanical intermediate storage of the toner images.
- An electrophotographic printing device shown schematically in FIG. 1 contains a photoconductor drum as intermediate carrier 10.
- a band-shaped intermediate carrier for example an OPC band
- the various units for the electrophotographic process are grouped around the intermediate carrier 10. These are essentially: a charging device 11 in the form of a charging corotron for charging the intermediate carrier 10; a character generator 12 with an LED comb for character-dependent exposure of the intermediate carrier 10 ? a developer station 13 for coloring the charge-dependent discharged image on the intermediate carrier 10 with the aid of toner.
- a cleaning station 14 is provided, with a cleaning brush integrated therein with an associated suction device and a discharge device.
- the intermediate carrier 10 (photoconductor drum) is driven by an electric motor and moved in the direction of the arrow in the printing operation.
- the printing device contains two transfer belts T1 and T2 arranged side by side, which serve to transfer toner images generated on the photoconductor 10 to a recording medium 15.
- the transfer ribbons Tl and T2 can be made of a temperature-resistant carrier fabric, e.g. B. of glass fibers or similar materials with elastic arranged thereon Cover layer consist of an elastomer. They are guided so that the elastic cover layer faces the intermediate carrier 10.
- Both transfer belts T1 and T2 are driven by an electric motor and are designed to be pivotable on and off the photoconductor drum 10. In the exemplary embodiment shown, they are swiveled in and out jointly, but it is also possible to design them to be swiveled in and out separately. In order to accomplish this pivoting in and out, both transfer belts T1 and T2 are guided over two pivotably arranged guide rollers 16.
- the transfer of the toner images generated on the intermediate carrier 10 to the belt-shaped transfer elements T1 and T2 takes place in the exemplary embodiment shown by electrostatic transfer. However, it is also possible to generate this transmission purely mechanically by pressing and passing it on.
- the belt surface is electrostatically charged directly in front of the transfer region on the photoconductor drum 10 by means of a charging station 17, which can consist, for example, of a corotron. Because of the essentially electrostatic transfer effect, only very small forces and contact zones between the photoconductor 10 (intermediate carrier) and the transfer ribbons T1 and T2 are necessary. This avoids excessive heating of the photoconductor.
- the toner images thus transferred to the transfer belts T1 and T2 are heated, for example with the aid of an infrared heating device 18, to the sticky state of the toner images. Then they are transferred to the recording medium 15 in a transfer printing and fixing station 19.
- the transfer printing and fixing station 19 serves both as a transfer printing station and as a fixing station. For this purpose, it contains two rollers, namely an upper roller 20 and a lower roller 21.
- the transfer tape T1 serving for printing on the front of the recording medium 15 is guided over the lower roller 21 and that for printing on the rear of the recording medium 15 serving transfer belt T2 over the upper roller 20.
- the rollers 20 and 21 are elastically supported and each have because a heater, e.g. B. in the form of a radiator. With sufficient dimensions, it is also possible to heat only one roller.
- the transfer tapes T1 and T2 are guided over cleaning rollers 22.
- a loading station 23 arranged downstream of the cleaning rollers 22 in the direction of movement of the transfer belts T1 and T2 unloads the transfer belts T1 and T2 before they are brought to a defined state of charge again via the loading station 17.
- the recording medium 15 can consist of a single sheet or of continuous paper. Furthermore, it should be noted that the terms front and back serve only as relative names for the two sides of the recording medium 15, they are interchangeable.
- the transfer belts T1 and T2 are arranged side by side.
- the transfer belt T1 is assigned to the front side (in this case the underside) of the recording medium 15 and the transfer belt T2 is assigned to the rear side (in this case the top side) of the recording medium 15. So that this simultaneous printing of the recording medium 15 can take place in the transfer printing and fixing station 19, the transfer ribbon T2 assigned to the rear side is guided over a deflection device 24.
- the deflection device 24 consists of a feed deflection device 24/1 and a return deflection device 24/2.
- Both deflection devices 24/1 and 24/2 have two deflection elements 25 and 26 arranged at an angle to one another, the transfer belt T2 being guided over the deflection elements in such a way that only the non-stressing side of the transfer belt touches the deflection elements.
- the deflection elements 25 and 26 can e.g. B. consist of rods or of movably mounted rollers. Their radius should be such that the toner adhering to the transfer belt T2 is not blasted off by a deflection angle that is too sharp.
- the deflecting elements 24/1 and 24/2 are designed with respect to the position of their deflecting elements 25 and 26 such that the transfer belt T2, which wraps around the upper roller 20, is positioned exactly above the transfer belt T1 wrapping around the lower roller 21 .
- the printer controller consists schematically of a central processing unit CPU, a page memory SP, which, for. B. is divided into a memory area for front sides VS and a memory area for rear sides RS and a data control unit DC. All units of the control system are connected to one another and to the character generator 12 via a BUS system.
- the generation of the front and back toner images on the photoconductor drum 10 and thus on the transfer belts T1 and T2 is carried out by appropriate data preparation via the data control device DC, the data starting from a data source (HOST) e.g. B. an external data memory via an interface of the data control device DC.
- the data of the individual pages to be printed are stored in the page memory SP, for example separated from the front side VS and rear side RS in corresponding storage areas. If a sequence of recording media 15 is now to be printed, it is necessary, due to the different transit times of the toner images arranged on the transfer belts T1 and T2, to reach the transfer and fixing station 19, the toner images for the back and to produce the front side staggered in time on the intermediate carrier 10.
- the length of the transfer belt for printing on the front side is dimensioned such that a complete toner image of one page can be generated on the transfer belt T1 before the toner image reaches the transfer printing and fixing station 19 and one continues to walk away that the length of the transfer belt T2 between the transfer printing and fixing station 19 and the intermediate carrier 10 is dimensioned such that it can take up two toner images before the first toner image reaches the transfer printing and fixing station 19, so it is necessary first Using the intermediate carrier 10 on the transfer belt for the rear side T2 to generate the rear side toner image for the first recording medium in the sequence of two supplied recording media 15.
- this toner image synchronization can also be achieved by appropriately deflecting the transfer belt T1 via a deflection roller 27 and thereby the conveying length of the transfer belt for the front side T1 between the intermediate carrier 10 and transfer and fixing station 19 of the conveying length of the transfer belt for the Adapts rear side T2 between intermediate carrier 10 and transfer and fixing station 19.
- a simultaneous production of " ⁇ is possible nertrade for the front and back of an associated A zeichnu ⁇ gsconces on the photoconductor drum 10.
- One eitvermeteren preparation of the data for the individual to be produced toner images on the control of the device requires not in this case.
- a combined transfer printing and fixing station 19 is used.
- the rollers 20 and 21 would serve as unheated rotatable rollers only for transfer printing of the toner images on the recording medium.
- An additional fixing station arranged in the paper transport direction (arrow) would then be necessary to fix the re-printed toner images on the recording medium.
- This fuser could also be designed as a thermal pressure fuser or z. B. from a Blitzfixierstation or a heat-setting station.
- deflection elements in the form of spring-mounted, smoothly polished half-shells or similar elements instead of the rotatable rollers 20 and 21.
- T2 transfer belt back, back transfer belt
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Electrostatic Charge, Transfer And Separation In Electrography (AREA)
- Combination Of More Than One Step In Electrophotography (AREA)
- Fixing For Electrophotography (AREA)
- Counters In Electrophotography And Two-Sided Copying (AREA)
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4129277 | 1991-09-03 | ||
DE4129277A DE4129277A1 (de) | 1991-09-03 | 1991-09-03 | Elektrofotografisches simultan-doppeldrucksystem |
PCT/DE1992/000716 WO1993005447A1 (de) | 1991-09-03 | 1992-08-27 | Elektrofotografisches simultan-doppeldrucksystem |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0602087A1 true EP0602087A1 (de) | 1994-06-22 |
EP0602087B1 EP0602087B1 (de) | 1996-03-06 |
Family
ID=6439767
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP92918212A Expired - Lifetime EP0602087B1 (de) | 1991-09-03 | 1992-08-27 | Elektrofotografisches simultan-doppeldrucksystem |
Country Status (5)
Country | Link |
---|---|
US (1) | US5410384A (de) |
EP (1) | EP0602087B1 (de) |
JP (1) | JPH06510134A (de) |
DE (2) | DE4129277A1 (de) |
WO (1) | WO1993005447A1 (de) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2713989B1 (fr) * | 1993-12-21 | 1996-01-12 | Nipson | Imprimante à haute cadence d'impression et utilisations d'une telle imprimante. |
US5526107A (en) * | 1994-07-13 | 1996-06-11 | Scitex Corporation Ltd. | Color printing apparatus for producing duplex copies |
JPH10502747A (ja) * | 1994-07-15 | 1998-03-10 | シーメンス ニクスドルフ インフオルマチオーンスジステーメ アクチエンゲゼルシヤフト | ウエブ状の記録担体を印刷するためのマルチ機能を有するプリンタ |
EP0697634B1 (de) * | 1994-08-19 | 1996-04-17 | Siemens Nixdorf Informationssysteme AG | Wendeeinrichtung für bandförmige Aufzeichnungsträger |
US6108513A (en) * | 1995-04-03 | 2000-08-22 | Indigo N.V. | Double sided imaging |
EP0871082B1 (de) * | 1997-04-07 | 2008-05-07 | Punch Graphix International N.V. | Elektrostatographisches Druckgerät und Verfahren |
IL121564A (en) * | 1997-08-18 | 2001-06-14 | Scitex Corp Ltd | Double-sided printing press with a single printing roller for each color |
JP2000131893A (ja) * | 1998-10-27 | 2000-05-12 | Fujitsu Ltd | 両面印刷装置 |
JP3320367B2 (ja) * | 1998-12-08 | 2002-09-03 | 富士通株式会社 | 両面印刷装置および同装置の制御方法 |
US6466761B1 (en) | 2000-11-14 | 2002-10-15 | Xerox Corporation | Duplex transfer apparatus and processes |
Family Cites Families (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2990278A (en) * | 1955-12-29 | 1961-06-27 | Haloid Xerox Inc | Method and apparatus for transferring and fixing xerographic images |
US3212399A (en) * | 1962-12-21 | 1965-10-19 | Sperry Rand Corp | Film marking mechanism |
US4052128A (en) * | 1973-10-11 | 1977-10-04 | Terminal Data Corporation | Method of moving a document for stationarily exhibiting both sides thereof |
US4120034A (en) * | 1974-08-12 | 1978-10-10 | Xerox Corporation | Programmable controller for controlling reproduction machines |
US3940210A (en) * | 1974-08-12 | 1976-02-24 | Xerox Corporation | Programmable controller for controlling reproduction machines |
JPS55100582A (en) * | 1979-01-25 | 1980-07-31 | Ricoh Co Ltd | Toner image transferring method |
US4427285A (en) * | 1981-02-27 | 1984-01-24 | Xerox Corporation | Direct duplex printing on pre-cut copy sheets |
JPS57195057A (en) * | 1981-05-27 | 1982-11-30 | Sumitomo Bakelite Co Ltd | Process of folding back film opened at one side |
JPS5974542A (ja) * | 1982-10-22 | 1984-04-27 | Hitachi Ltd | プリンタ |
US4537493A (en) * | 1984-02-01 | 1985-08-27 | Eastman Kodak Company | Copy sheet positioning apparatus |
US4477176A (en) * | 1983-12-27 | 1984-10-16 | Eastman Kodak Company | Apparatus for producing multiple image simplex and duplex copies in a single pass |
DE3406244A1 (de) * | 1984-02-21 | 1985-08-22 | Siemens AG, 1000 Berlin und 8000 München | Laserdrucksystem fuer mehrfarben- und rueckseitendruck |
JPH0229217B2 (ja) * | 1984-11-13 | 1990-06-28 | Konishiroku Photo Ind | Zokirokuhoho |
FR2589104A1 (fr) * | 1985-10-28 | 1987-04-30 | Telephonie Ind Commerciale | Imprimante electrostatique indirecte recto-verso |
NL8900921A (nl) * | 1989-04-13 | 1990-11-01 | Oce Nederland Bv | Werkwijze en inrichting voor het overdragen van twee beelden op verschillende zijden van een ontvangstblad. |
EP0478820B1 (de) * | 1990-10-02 | 1996-01-03 | Siemens Nixdorf Informationssysteme Aktiengesellschaft | Druck- oder Kopiergerät für ein- oder mehrfarbigen Simplex- und Duplexdruck |
JPH04321062A (ja) * | 1991-04-22 | 1992-11-11 | Hitachi Koki Co Ltd | 連続印刷用紙の両面印刷装置 |
-
1991
- 1991-09-03 DE DE4129277A patent/DE4129277A1/de active Granted
-
1992
- 1992-08-27 DE DE59205624T patent/DE59205624D1/de not_active Expired - Fee Related
- 1992-08-27 JP JP5504827A patent/JPH06510134A/ja active Pending
- 1992-08-27 US US08/204,223 patent/US5410384A/en not_active Expired - Lifetime
- 1992-08-27 EP EP92918212A patent/EP0602087B1/de not_active Expired - Lifetime
- 1992-08-27 WO PCT/DE1992/000716 patent/WO1993005447A1/de active IP Right Grant
Non-Patent Citations (1)
Title |
---|
See references of WO9305447A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO1993005447A1 (de) | 1993-03-18 |
DE59205624D1 (de) | 1996-04-11 |
DE4129277A1 (de) | 1993-03-04 |
JPH06510134A (ja) | 1994-11-10 |
EP0602087B1 (de) | 1996-03-06 |
US5410384A (en) | 1995-04-25 |
DE4129277C2 (de) | 1993-06-03 |
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