EP0665963A1 - Printing or copying machine with a cooling device for the copying medium. - Google Patents
Printing or copying machine with a cooling device for the copying medium.Info
- Publication number
- EP0665963A1 EP0665963A1 EP93922492A EP93922492A EP0665963A1 EP 0665963 A1 EP0665963 A1 EP 0665963A1 EP 93922492 A EP93922492 A EP 93922492A EP 93922492 A EP93922492 A EP 93922492A EP 0665963 A1 EP0665963 A1 EP 0665963A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- recording medium
- cooling
- air
- printing
- copying
- 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
- G03G15/65—Apparatus which relate to the handling of copy material
- G03G15/6555—Handling of sheet copy material taking place in a specific part of the copy material feeding path
- G03G15/6573—Feeding path after the fixing point and up to the discharge tray or the finisher, e.g. special treatment of copy material to compensate for effects from the fixing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
- B41J29/377—Cooling or ventilating arrangements
-
- 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
- G03G15/20—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat
- G03G15/2003—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat
-
- 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
- G03G2215/00367—The feeding path segment where particular handling of the copy medium occurs, segments being adjacent and non-overlapping. Each segment is identified by the most downstream point in the segment, so that for instance the segment labelled "Fixing device" is referring to the path between the "Transfer device" and the "Fixing device"
- G03G2215/00413—Fixing 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
- G03G2215/00367—The feeding path segment where particular handling of the copy medium occurs, segments being adjacent and non-overlapping. Each segment is identified by the most downstream point in the segment, so that for instance the segment labelled "Fixing device" is referring to the path between the "Transfer device" and the "Fixing device"
- G03G2215/00417—Post-fixing device
- G03G2215/00421—Discharging tray, e.g. devices stabilising the quality of the copy medium, postfixing-treatment, inverting, sorting
-
- 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
-
- 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
- G03G2215/00535—Stable handling of copy medium
- G03G2215/00666—Heating or drying device
Definitions
- a toner image is generated on a recording medium consisting of individual sheets or continuous paper, and this toner image then thermally fixed in a heat setting station.
- Such an electrophotographic printing device for continuous paper with a thermal printing fixing station is known from WO 91/09352.
- the recording medium and the toner image fixed on it after leaving the fixing station, have a temperature in the range from 90 "to 120 ° or higher, depending on the material properties of the recording medium, which generally consists of paper
- the paper web runs directly into a post-processing system after it has left the fusing station, or it is immediately stacked in a stacking device.
- DE-Al 39 34 770 it is known from DE-Al 39 34 770 to arrange a blower in the area of the stacking device of an electrophotographic printing device which flows through the stack via an air flow that is perpendicular to the paper transport direction and cools it.
- an image-generating device with a thermal printing fixing station consisting of a fixing roller and a pressure roller is known.
- a heat converter device with associated electrical generator which has a heat transfer surface with an evaporator, is arranged downstream of the fixing station. The residual heat of the transfer medium is extracted via the heat transfer surface and heats a heating medium in the evaporator, the heating medium flowing through a turbine that drives a generator.
- the heat converter or generator is used to charge a storage battery in order to save the energy required to drive the imaging device.
- no. 96 describes a heat-fixing station for an electrophotographic copier, which has a heating plate over which the record carrier is guided and which serves to melt the toner on the record carrier. So that the heating plate comes into close contact with the recording medium, a fan is arranged opposite the heating plate, which presses the recording medium against the heating plate via an air flow.
- the object of the invention is to provide a printing or copying device with a heat-fixing arrangement, in which the recording medium is cooled gently, quietly and effectively after leaving the fixing device.
- a metal saddle is provided as the cooling surface, which has uniformly distributed openings through which cool air is blown.
- the recording medium is slightly lifted from the saddle by the emerging air in a gap of 0.1 to 0.5 mm.
- the air moves at high speed in the narrow gap and can therefore be optimally heated by the hot paper web. This means that a smaller volume of air with a lower flow rate is required than when the recording medium web is blown on directly.
- the recording medium web is blown on directly, only a small fraction of the air volume is brought into contact with the hot paper surface in a very short time.
- the cooling time is extremely short (100 msec to 200 sec).
- additional cooling devices in addition to the actual cooling device with a cooling surface. These can consist of a blower with which the recording medium is blown against its direction of travel.
- the cooling device is particularly suitable for use in a printing or copying device with a thermal printing film.
- Xier adopted with upstream preheating low-temperature saddle in the direction of recording medium.
- the low-temperature saddle has a radius of curvature which ensures that the recording medium is pressed against the saddle surface over the entire length of the preheating saddle.
- the cooling device downstream of the pressure fixing device -us fixing roller and pressure roller advantageously has a radius of curvature similar to that of the preheating saddle with regard to its cooling surface.
- the recording medium is thus placed flat on the cooling surface.
- the recording medium passes through the fixing station with preheating saddle and the cooling device in a continuous undisturbed arc with a constant radius.
- the recording medium which is preferably made of paper, is thus stressed as little as possible.
- FIG. 1 shows a schematic sectional illustration of the paper run from an image-forming device to a stacking device in an electrophotographic printing device
- FIG. 2 shows a schematic sectional illustration of an embodiment of a cooling device for the heated recording medium with a cooling surface penetrated by air outlet nozzles for producing an air cushion between the cooling surface and the recording medium,
- Figure 3 is a schematic sectional view of a Bruhj. - device with an air-cooled Contact saddle than Bruhi "laugh and
- FIG. 4 shows a cooling device with a liquid-cooled contact saddle as a cooling surface.
- An electrophotographic printing device (not shown here) for operation with continuous paper contains an image-forming device B for generating a toner image on the continuous paper, which can be designed, for example, in accordance with WO 91/09352, and a heat-fixing device W with a subordinate recording medium - Cooling device K and a stacking device S stacking the printed record carrier.
- the heat fixing device W is designed as a thermal pressure fixing device. It contains a heating roller 11 heated by radiators 10 and a pressure roller 12 which can be pivoted and swiveled by an electric motor to the heating roller 11.
- the heating or fixing roller 11 consists of an aluminum cylinder with a heat-resistant coating arranged thereon, the pressure roller 12 of an aluminum cylinder with a coating of silicone.
- the heating or fixing roller 11 is driven by an electric motor. This is assigned an oiling device 13 for applying separating oil to the heating roller via an oil application element 14.
- the vacuum brake 16 and driven by the rollers 11 and 12 the recording medium 17 is guided tightly over the preheating caliper 15.
- a loose toner image on the recording medium is preheated on the preheating saddle 15 and fixed between the rollers 11 and 12 by pressure and heat.
- a cooling device K arranged downstream of the rollers 11 and 12 in the direction of the recording medium ensures that the heated recording medium 17 is cooled
- the cooling device in the embodiment shown has openings provided with a cooling surface 19 which is swept by the recording medium 17, cold air supplied via an air supply duct 20 flowing out of the openings and a cooling air cushion being created under the recording medium.
- air is blown onto the concreted side of the record carrier via an opposite profile 18, specifically against the direction of travel of the record carrier.
- the continuous paper 17 is preheated via a preheating saddle 15, which consists of two heated saddles connected in series, namely a stationary preheating saddle 21 and a heating saddle 23 that can be pivoted about a pivot point 22 two separate heating zones.
- the entire preheating section has a length of approximately 500 to 700 mm.
- the recording medium 17 slides with its toner-free side on sliding surfaces 24 of the preheating saddle 21 or heating saddle 23.
- the sliding surfaces or the saddles have a radius of curvature which in the example shown is approximately 700 mm. Due to the curvature of the sliding surfaces 24 in connection with the train through the rollers 11 and 12 and the braking by the vacuum brake 16, a force component acts over the entire length of the saddle, which presses the recording medium 17 against the sliding surfaces 24.
- the saddles 21 and 23 have oblong depressions 25 transverse to the direction of the recording medium, which extend over the entire width of the saddles. They are connected to a vacuum channel 27 by lateral bores 26. The vacuum channel runs below the saddles 21 and 23 and is connected to a vacuum-generating device, for example a pump. Due to the negative pressure, the recording medium 17 (paper) is sucked onto the sliding surfaces 24 of the saddles and the water vapor released by the preheating is sucked off.
- the saddles 21 and 23 are heated by electrical resistance elements in the form of exchangeably arranged heating cartridges 28.
- the saddles have through holes 29 for receiving the heating cartridges 28.
- the preheating saddle comprising the preheating saddle and heating saddle 23 is designed as a low-temperature saddle with the greatest possible length, so that the temperature difference between the recording medium 17 and saddle 15 becomes as small as possible.
- the large overall length in connection with a regulation of the heating power of the electrical resistance elements via a control arrangement results in an approximately constant energy flow along the saddle from the saddle 15 to the recording medium 17.
- the temperature supply in the fixing gap between the rollers 11 and 12 is important.
- the recording medium must also be heated in the area of this fixing gap in such a way that there is no high thermal load on the recording medium. Fluctuations in the temperature in the fusing gap lead to a deterioration in the fusing quality.
- the recording medium has a temperature in the range from 90 to 120 ° in the case of paper when it leaves the heat-fixing device W.
- This heat stored in the recording medium must be device K can be dismantled to the extent that the paper after stacking in the stacking device S has a temperature of below 60 °, so that there is no sticking of the printed images lying on top of one another.
- this means that the paper web has to be cooled by 60 ° K in about 0.5 seconds. This corresponds to a power dissipation of approx. 4000 W in 0.5 sec.
- the cooling device K is provided, which can be designed in accordance with the exemplary embodiments in FIGS. 2 to 4.
- the cooling device K contains a cooling surface 19 made of plastic or metal with a plurality of air outlet openings 30 arranged on the cooling surface.
- the cooling surface 19 extends over the entire width of the recording medium 17. It has a length which depends on the cooling capacity required.
- the cooling surface 19 is bandaged with an air supply duct 20 and a blower 31 via which air is supplied to the air supply duct 20. The cooling air exits through the air outlet openings 30 and lifts the air on the
- the air moves at high speed in the narrow gap between the record carrier 17 and the cooling surface 19. This way you can optimally cool the hot paper web.
- the air outlet openings 30 are supplied with a large volume of air at a relatively low flow rate via fans 31 and supply duct 20 via a distributor space 32.
- the cooling surface has a radius of curvature which corresponds approximately to the radius of curvature of the preheating saddle 15. It is arranged in such a way that the recording medium 17 is guided step-free in a predetermined radius of curvature through the heat-fixing station including the preheating saddle and the cooling device.
- an additional cooling device 18 is arranged in the paper running area receiving the cooling surface 19 on a side of the recording medium 17 facing away from the cooling device K. It consists of a hollow profile with air outlet openings 33 which are arranged in steps along the paper running area.
- the hollow profile 18 is connected to a blower 34 that supplies the hollow profile 18 with cooling air.
- the fan 34 can also be part of the fan 31.
- the cooling air supplied to the hollow profile 18 exits at the air outlet openings 33 in such a way that it sweeps over the record carrier on its concrete side against the direction of travel of the recording medium 17 and additionally cools it. If the air flow is directed in the direction of the record carrier running, the surface boundary air layer on the record carrier 17 is penetrated with cooling air, which increases the cooling effect.
- the cooling surface 19 consists of a closed metal saddle.
- the surface geometry corresponds to the cooling saddle of FIG. 2.
- Cooling ribs 35 are formed on the inside of the cooling saddle, which protrude into the air distribution space 32.
- the cooling air supplied to the distribution space 32 via the blower 31 and the air supply duct 20 sweeps over the cooling fins 35 and is, for example, via lateral outlet openings and one optionally there arranged return channel derived.
- the recording medium 17 slides with its non-concrete side directly on the cooling surface and is therefore in direct contact with it, so that the heat of the recording medium can be absorbed directly by the cooling surface 19.
- the cooling surface 9 is an element of a cooling saddle through which gaseous cooling medium flows, in this case air.
- the cooling surface 19 can also be an element of a cooling saddle through which liquid cooling medium flows.
- the one made of thermally conductive material e.g. Aluminum existing cooling saddle cooling channels 36 through which water or other
- Coolant is passed.
- the liquid cooling medium is supplied to the cooling channels 36 via an inlet 37 above and discharged via an outlet 38 below.
- the cooling medium is conveyed via a pump (not shown here), and a heat exchanger can be provided to remove the heat from the cooling medium.
- a heat exchange the arrangement of cooling fins or the like is also possible.
- the electrophotographic printing device shown contains a stacking device S.
- the purpose of this is to stack the recording medium 17 via conveyor rollers 39 on a storage surface (not shown here), from where it can be removed by job.
- the stacking device S can have air conveying profiles 40 with air outlet openings 41 arranged on both sides of the recording medium 17 in their inlet area, as shown in FIG.
- the air conveying profiles 40 extend over the entire width of the recording medium, the air outlet openings 41 being aligned such that they are one the two sides of the record carrier sweep the air flow which is directed against the direction of the record carrier.
- the air delivery profiles 40 could thus be connected to blowers or other air delivery devices. Instead of continuous air conveying profiles with air outlet openings, it is also possible to arrange individual separate blower elements distributed over the width of the recording medium or a blower element with a corresponding distributor device for the air flow.
- a cooling saddle with an associated cooling surface is arranged in the paper running area.
- a plurality of cooling saddles can also be arranged one behind the other, each of which the cooling medium flows through. They then form a common composite cooling surface.
- conveyor rollers 40 air conveying profiles, cooling air ducts 41 air outlet openings, nozzles
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Fixing For Electrophotography (AREA)
- Control Or Security For Electrophotography (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4235667A DE4235667C1 (en) | 1992-10-22 | 1992-10-22 | Printer or copier with a cooling device for the recording medium |
DE4235667 | 1992-10-22 | ||
PCT/DE1993/000976 WO1994009409A1 (en) | 1992-10-22 | 1993-10-13 | Printing or copying machine with a cooling device for the copying medium |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0665963A1 true EP0665963A1 (en) | 1995-08-09 |
EP0665963B1 EP0665963B1 (en) | 1996-06-12 |
Family
ID=6471091
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP93922492A Revoked EP0665963B1 (en) | 1992-10-22 | 1993-10-13 | Printing or copying machine with a cooling device for the copying medium |
Country Status (4)
Country | Link |
---|---|
US (1) | US5557388A (en) |
EP (1) | EP0665963B1 (en) |
DE (1) | DE4235667C1 (en) |
WO (1) | WO1994009409A1 (en) |
Families Citing this family (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH08262898A (en) * | 1995-03-25 | 1996-10-11 | Asahi Optical Co Ltd | Recording paper drying preventive mechanism |
US5787321A (en) * | 1996-02-09 | 1998-07-28 | Asahi Kogaku Kogyo Kabushiki Kaisha | Temperature controlling device for fixing unit |
US6259871B1 (en) * | 1998-11-02 | 2001-07-10 | Xerox Corporation | Paper cooling system |
US6094560A (en) * | 1999-08-04 | 2000-07-25 | Xerox Corporation | Electrophotographic printing machine including a post-fusing substrate moisturizing and decurling device |
US6167220A (en) * | 1999-11-05 | 2000-12-26 | Xerox Corporation | Anti-condensation baffle unit |
US6226474B1 (en) * | 1999-12-16 | 2001-05-01 | Nexpress Solutions Llc | Air impingement post fuser receiver member cooler device |
US6272311B1 (en) * | 2000-10-12 | 2001-08-07 | Heidelberg Digital L.L.C. | Air cooling station for electrophotographic copier |
EP1217463B1 (en) * | 2000-12-22 | 2009-10-21 | Eastman Kodak Company | Digital printing or copying machine including a fixing device |
US6567629B2 (en) * | 2001-05-16 | 2003-05-20 | Hewlett-Packard Development Company, L.P. | Cooling device for imaging apparatus |
US7167193B2 (en) * | 2003-02-28 | 2007-01-23 | Eastman Kodak Company | Active cooling system for laser imager |
DE10359666B4 (en) * | 2003-12-18 | 2011-06-16 | Eastman Kodak Co. | Method and fixing device for fixing toner on a printing substrate |
JP2005255296A (en) * | 2004-03-10 | 2005-09-22 | Konica Minolta Business Technologies Inc | Image-forming device |
CN100480889C (en) * | 2004-09-13 | 2009-04-22 | 柯尼卡美能达商用科技株式会社 | Imaging device |
DE102007048158B3 (en) | 2007-10-08 | 2009-05-20 | OCé PRINTING SYSTEMS GMBH | Cooling and cooling method for a substrate in an electrographic printer or copier |
JP5104197B2 (en) * | 2007-10-22 | 2012-12-19 | 富士ゼロックス株式会社 | Recording material cooling device and image forming apparatus using the same |
JP4605482B2 (en) * | 2008-09-24 | 2011-01-05 | 富士ゼロックス株式会社 | Glossiness imparting device and image forming system |
DE102009009297B4 (en) | 2009-02-17 | 2011-01-27 | OCé PRINTING SYSTEMS GMBH | Roller for influencing the temperature of a substrate in a digital printer |
JP2015034970A (en) * | 2013-07-08 | 2015-02-19 | 株式会社リコー | Cooling device, and image forming apparatus |
EP2868479A1 (en) * | 2013-10-24 | 2015-05-06 | OCE-Technologies B.V. | Apparatus for treating media sheets |
JP2016215482A (en) * | 2015-05-20 | 2016-12-22 | 三菱電機株式会社 | Thermal transfer printer |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3502407A (en) * | 1967-07-26 | 1970-03-24 | Addressograph Multigraph | Pneumatic delivery device |
US3517164A (en) * | 1968-07-22 | 1970-06-23 | Addressograph Multigraph | Image fusing assembly |
US3827855A (en) * | 1971-10-12 | 1974-08-06 | Electroprint Inc | Toner fixing method and apparatus |
US4460350A (en) * | 1980-09-02 | 1984-07-17 | Sperry Corporation | Continuous printed paper stacking device |
US5008716A (en) * | 1989-10-05 | 1991-04-16 | Hitachi Koki Co., Ltd. | Paper cooling apparatus for an electrophotographic printer |
EP0572050B1 (en) * | 1989-12-13 | 1998-01-21 | Océ Printing Systems GmbH | Electrofotographic printing apparatus for printing on both sides of an endless paper web, comprising a thermal fixing unit |
-
1992
- 1992-10-22 DE DE4235667A patent/DE4235667C1/en not_active Expired - Fee Related
-
1993
- 1993-10-13 US US08/428,118 patent/US5557388A/en not_active Expired - Lifetime
- 1993-10-13 EP EP93922492A patent/EP0665963B1/en not_active Revoked
- 1993-10-13 WO PCT/DE1993/000976 patent/WO1994009409A1/en not_active Application Discontinuation
Non-Patent Citations (1)
Title |
---|
RESEARCH DISCLOSURE Nr. 327 , Juli 1991 , EMSWORTH,GB Seite 516 XP258730 ANONYMOUS 'SHEET TURNOVER AND COOLING DEVICE' s * |
Also Published As
Publication number | Publication date |
---|---|
WO1994009409A1 (en) | 1994-04-28 |
DE4235667C1 (en) | 1994-01-05 |
US5557388A (en) | 1996-09-17 |
EP0665963B1 (en) | 1996-06-12 |
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