EP0536931A2 - Appareil d'enregistrement d'images capable de lisser des images de toner - Google Patents

Appareil d'enregistrement d'images capable de lisser des images de toner Download PDF

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Publication number
EP0536931A2
EP0536931A2 EP92308881A EP92308881A EP0536931A2 EP 0536931 A2 EP0536931 A2 EP 0536931A2 EP 92308881 A EP92308881 A EP 92308881A EP 92308881 A EP92308881 A EP 92308881A EP 0536931 A2 EP0536931 A2 EP 0536931A2
Authority
EP
European Patent Office
Prior art keywords
sheet
fixing
image
roller
thin film
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.)
Withdrawn
Application number
EP92308881A
Other languages
German (de)
English (en)
Other versions
EP0536931A3 (en
Inventor
Kunihisa Yoshino
Mitsuo Motohashi
Yoshiko Matsuoka
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.)
Konica Minolta Inc
Original Assignee
Konica Minolta Inc
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 JP3263923A external-priority patent/JPH05100595A/ja
Priority claimed from JP3266521A external-priority patent/JPH05107962A/ja
Application filed by Konica Minolta Inc filed Critical Konica Minolta Inc
Publication of EP0536931A2 publication Critical patent/EP0536931A2/fr
Publication of EP0536931A3 publication Critical patent/EP0536931A3/en
Withdrawn legal-status Critical Current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
    • G03G8/00—Layers covering the final reproduction, e.g. for protecting, for writing thereon
    • 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
    • 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
    • G03G15/6588—Apparatus which relate to the handling of copy material characterised by the copy material, e.g. postcards, large copies, multi-layered materials, coloured sheet material
    • G03G15/6591—Apparatus which relate to the handling of copy material characterised by the copy material, e.g. postcards, large copies, multi-layered materials, coloured sheet material characterised by the recording material, e.g. plastic material, OHP, ceramics, tiles, textiles
    • 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"
    • G03G2215/00371—General use over the entire feeding path
    • 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
    • G03G2215/00443—Copy medium
    • G03G2215/00493—Plastic
    • G03G2215/00497—Overhead Transparency, i.e. OHP
    • 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
    • G03G2215/00523—Other special types, e.g. tabbed

Definitions

  • the present invention relates to an image recording apparatus wherein toner images are transferred onto a recording sheet and then fixed thereon through an electrophotographic method, and more particularly to an image recording apparatus capable of producing even glossy images.
  • image recording apparatuses capable of forming color images have spread in addition to those forming black and white images.
  • a transparent light transmission sheet on which images of graphics and graphs are formed by means of black or colored toners is used in an overhead projector (OHP) so that the images thereon are projected on a screen.
  • OHP overhead projector
  • a light transmission sheet on which colored toner images are copied and fixed by means of an ordinary electrophotographic copying machine has failed, when projected by an OHP, to offer sharp projected color images.
  • the reason why sharp projected color images can not be obtained is that there are fine irregularities on the surface of color toners deposited on a transparent film and the irregularities cause projected light to be subjected to diffusion or diffused reflection and thereby color toner portions are projected on a screen as a shade.
  • a light transmission sheet that offers sharp projected color images can be obtained by smoothing the surface of color toners deposited on the sheet.
  • a light transmission sheet ejected from a copying machine after being subjected to transferring and fixing of color toner images onto its transparent film in the copying machine has been fixed again in an image quality improving apparatus provided with a built-in heater and a pair of rollers for improving light transmitting property and glossiness prepared separately in a way that the light transmission sheet passes through the rollers while being sandwiched therebetween with a toner image surface facing a thin film.
  • the aforementioned image quality improving apparatus prepared separately from a copying machine is of a structure similar to that of a fixing unit provided in the copying machine. It is therefore extremely desirable that a light transmitting property can be enhanced or a gloss can be increased by feeding a light transmission sheet or a color copy ejected from a copying machine again into the copying machine. However, it is impossible to realize this easily because it is necessary to feed the light transmission sheet or the color copy so that a thin film may be placed on the surface of the light transmission sheet or the color copy.
  • An object of the invention is to solve the problems 1 - 8 mentioned above and to provide an image recording apparatus wherein it is possible to improve a gloss and a light transmitting property by feeding thereinto again a light transmission sheet or a color copy which has been subjected to fixing.
  • the invention is to provide an image recording apparatus solving the aforementioned problems
  • the first invention which has solved the problem described in the above-mentioned item 1 is to provide an image recording apparatus comprising a sheet feeding means, an image forming means that transfers toner images formed on an image carrier onto a recording material fed by the sheet feeding means and a fixing means that fixes the recording material having thereon transferred toner images, wherein the recording material is fed again in a manner that a toner surface of fixed recording material is caused to face a thin film and is sandwiched between the thin film and a film support, and the film support is caused to face a feed-out member of the sheet feeding means and the thin film is caused to face the double-feed preventing means, so that the recording material may pass through the fixing means again for smoothing the toner images.
  • the second invention which has solved the problem described in the above-mentioned item 2 is to provide an image recording apparatus comprising a sheet feeding means, an image forming means that transfers toner images formed on an image carrier onto a recording material fed by the sheet feeding means and a fixing means that fixes the recording material having thereon transferred toner images, wherein a toner surface of the aforementioned fixed recording material is sandwiched between a thin film and a film support in a way that the toner surface faces the thin film, and the aforesaid sheet feeding means is driven again with the film support facing the image carrier mentioned above so that the recording material may pass through the fixing means again for smoothing the toner images.
  • the third invention which has solved the problem described in the above-mentioned item 3 is to provide an image recording apparatus comprising a sheet feeding means, an image forming means that transfers toner images formed on an image carrier onto a recording material fed by the sheet feeding means and a fixing means that fixes the recording material having thereon transferred toner images, wherein a toner surface of the fixed recording material is sandwiched between a thin film applied by a film applying unit and a film support in a way that the toner surface faces the thin film and the above-mentioned sheet feeding means is driven again with the aforementioned film-applied portion taking the lead so that the recording material may pass through the fixing means again for smoothing the toner images.
  • the fourth invention which has solved the problem described in the above-mentioned item 4 is to provide an image recording apparatus comprising a sheet feeding means, an image forming means that transfers toner images formed on an image carrier onto a recording material fed by the sheet feeding means and a fixing means that fixes the recording material having thereon transferred toner images, wherein a toner surface of the aforementioned fixed recording material is sandwiched between a thin film and a film support in a way that the toner surface faces the thin film, and the above-mentioned sheet feeding means is driven again with the aforementioned thin film facing an elastic fixing member of the fixing means so that the recording material may pass through the fixing means again for smoothing the toner images.
  • the fifth invention which has solved the problem described in the above-mentioned item 5 is to provide an image recording apparatus comprising a sheet feeding means, an image forming means that transfers toner images formed on an image carrier onto a recording material fed by the sheet feeding means and a fixing means that fixes the recording material having thereon transferred toner images, wherein a toner surface of the aforementioned fixed recording material is sandwiched between a thin film and a film support in a way that the toner surface faces the thin film, and the above-mentioned sheet feeding means is driven again so that the recording material may pass through the aforementioned fixing means having upper and lower conveyance members which are different in hardness in a way that a conveyance member which comes in contact with the film support is harder to be not less than 90° in surface hardness ASKER C at the surface again, for smoothing the toner images.
  • the invention is to provide an image recording apparatus wherein the aforementioned problems have been solved and, the sixth invention which has solved the problem described in the above-mentioned item 6 is to provide an image recording apparatus comprising a sheet feeding means, an image forming means that transfers toner images formed on an image carrier onto a recording material fed by the sheet feeding means and a fixing means that fixes the recording material having thereon transferred toner images, wherein the sheet feeding means and the fixing means are operated while the image forming means is kept to be out of operation, and a toner surface of the aforementioned fixed recording material is sandwiched between a thin film and a film support in a way that the toner surface faces the thin film, and the above-mentioned sheet feeding means is driven again so that the recording material may pass through the fixing means again for smoothing the toner images.
  • the seventh invention which has solved the problem described in the above-mentioned item 7 is to provide an image recording apparatus comprising a sheet feeding means, an image forming means that transfers toner images formed on an image carrier onto a recording material fed by the sheet feeding means and a fixing means that fixes the recording material having thereon transferred toner images, wherein the sheet feeding means and the fixing means are operated in a way that each of a conveyance speed of the sheet feeding means and a conveyance speed of the fixing means is lower than that in image forming, and a toner surface of the aforementioned fixed recording material is sandwiched between a thin film and a film support in a way that the toner surface faces the thin film, and the aforesaid sheet feeding means is driven again so that the recording material may pass through the fixing means again for smoothing the toner images.
  • the surface of a thin film is caused to face a roller with rubber hardness of not more than 90° in surface hardness ASKER C whose fixing temperature is within a range of 100°C - 160°C by sandwiching a toner image surface in fixing upside down for re-fixing considering the features of a thin film surface.
  • the invention provides an image recording apparatus comprising a sheet feeding means, an image forming means that transfers toner images formed on an image carrier onto a recording material fed by the sheet feeding means and a fixing means that fixes the transferred toner images on the recording material, wherein the sheet feeding means and the fixing means are operated, and then the sheet feeding means is driven again with fixing roller conditions (roller materials, load, nips etc.) of the fixing means set identical to those in image forming and with a toner surface of the fixed recording material being sandwiched between a thin film applied by a film applying unit and a film support in a way that the toner surface faces the thin film, so that the recording material may pass through the fixing means for re-fixing.
  • fixing roller conditions roller conditions
  • Fig. 1 is a structural diagram showing an example of an image recording apparatus of the invention.
  • Fig. 2 is an illustration showing how a recording material to be fed again is caused to face a thin film
  • Fig. 3 is an illustration showing re-feeding conditions at a manual sheet-insertion section
  • Fig. 4 is an illustration showing re-feeding conditions at a transfer section
  • Fig. 5 is an illustration showing re-feeding conditions at a fixing section.
  • Fig. 6 is an illustration showing conditions before re-feeding (a) and those after re-feeding (b) for a light transmission film (a transparency).
  • Fig. 7 is a block diagram showing the control system.
  • An image recording apparatus of the invention which will be explained as follows referring to examples is a color image recording apparatus having a function in which transparency and glossiness of toner images are improved when a recording material ejected after being fixed is fed again from a manual sheet-insertion section with a toner image surface on the recording material facing a thin film prepared separately, keeping step with function of the image recording apparatus for recording color images.
  • the numeral 30 is an image carrier in a drum shape that is to say a photoreceptor drum having OPC photoreceptor coated on a drum and being ground and rotated clockwise.
  • the numeral 35 is a scorotron charging unit that gives electric charges to the photoreceptor on the surface of the photoreceptor drum 30,
  • the numeral 40 is an area for imagewise exposure where a laser beam is projected so that it is focused on the surface of the photoreceptor drum 30 by means of an optical system for exposure.
  • a laser writing unit for example, may be used for the optical system for exposure. After color signals outputted from an image-reading unit are inputted in the laser writing unit, a laser beam emitted from an unillustrated semiconductor laser is subjected to rotational scanning by means of polygon mirror 41 in the laser writing unit, and then is deflected by reflection mirror 43 through f ⁇ lens to be projected on the surface of the photoreceptor drum 30 charged uniformly by the charging unit 35 mentioned above.
  • both the primary scanning by means of the laser beam and the sub-scanning by means of a rotation of the photoreceptor drum 30 start forming a latent image for the first color on an image area on the photoreceptor drum 30.
  • the latent image is then subjected to reversal development under non-contact conditions in developing means 36 (Y) containing, for example, yellow (Y) toners as the first color, thus, a yellow toner image is formed on the surface of the photoreceptor drum 30.
  • developing means 36 (Y) containing, for example, yellow (Y) toners as the first color
  • the photoreceptor drum 30 is charged again by the charging unit 35, then, the second color signals outputted from a signal processing unit are inputted in the writing unit mentioned above and writing on the surface of the photoreceptor drum 30 by means of the second color signals is conducted in the same manner as in the case of the first color signals mentioned above, thus, a latent image is formed.
  • This latent image is subjected to reversal development under non-contact conditions in developing means 36 (M) containing, for example, magenta (M) toners as the second color, thus, a magenta toner image is formed.
  • This magenta toner image is formed to be superposed on the yellow toner image which has been formed already.
  • writing by means of the third color is conducted and a latent image is formed.
  • This latent image is subjected to reversal development under non-contact conditions in developing means 36 (C) containing, for example, cyan (C) toners as the third color.
  • the cyan toner image is formed to be superposed on the yellow toner image and the magenta toner image so that a color image may be obtained.
  • Developing means 36 (BK) containing black toners is further provided, and when a black toner image is further formed to be superposed in the same manner as in the foregoing, a color image with high image quality can be obtained.
  • charging by means of charging unit 35 provided around photoreceptor drum 30 and itself, exposure by means of a laser writing unit for each color and development processing by means of developing means 36 (Y), (M), (C) and (BK) are conducted for each color, namely four times in total for forming a color toner image which is obtained by superposing each color image on the image area on the surface of the photoreceptor drum 30.
  • the numerals 61 and 62 represent conveyance paths through which a recording material is conveyed one sheet by one sheet.
  • recording materials loaded in sheet feeding cassette 50 leading edges thereof are lifted by an unillustrated sheet lifting plate, the uppermost sheet is fed out by feed-out roller 51 and then is conveyed, after being separated by double-feed-preventing rollers 52a and 52b, through conveyance paths 61 and 62 to the point of registration rollers 53a and 53b where the recording material stops provisionally.
  • the registration rollers 53a and 53b feed out the recording material synchronizing with a toner image on the photoreceptor drum 30 so that the toner image may be transferred onto the recording material at the transferring means 37.
  • the transferring means 37 in the present example is composed of endless belt 373 spread over rotating rollers 371 and 272 and charging means 374 for image-transferring provided at the position that is behind the belt 373 and faces the transferring area.
  • the transferring means presses the recording material that moves while keeping in contact with the belt 373 onto the photoreceptor drum 30 and the charging means 374 positioned behind transfers toner images onto the recording material.
  • the recording material on which image-transferring has been finished is separated from the belt 373 by roller 372, conveyed to fixing means 70 through conveyance belt 63 and ejected from the apparatus after being fixed.
  • blade 39A of the cleaning means 39 keeps in contact with the surface of the photoreceptor drum 30 from which the recording material has been separated, and removes toners staying thereon. After completion of removal of residual toners, the blade is moved away from the surface of the drum again for the following process of color image forming.
  • the transferring means 37 which has finished transferring is moved away from the photoreceptor drum 30 to the position shown with dotted lines.
  • the recording material is conveyed again as follows.
  • Fig. 2 shows a means for causing a recording material to be conveyed again to face a thin film
  • the means is prepared separately as sandwiching means F wherein thin film F1 such as, for example, a polyester film or a polyimide film having a thickness of not more than 50 ⁇ m and heat resisting property causing less toner deposition and film support F2 such as a sheet of paper or a resin sheet having a thickness greater than that of F1 and heat resisting property are included and an edge of the thin film F1 and that of the film support F2 are pasted together at joining portion F3.
  • Recording material T to be conveyed again is sandwiched in the sandwiching means F with a toner image surface facing the thin film F1.
  • an image forming mode (copy mode) explained previously may be changed to a re-feeding mode.
  • Fig. 3 shows how a recording material is fed again in a manual sheet insertion portion, wherein recording material T sandwiched in sandwiching means F is inserted into a manual sheet insertion portion with joining portion F3 as a leading edge, namely in a way that the joining portion F3 hits a sheet feeding means, and with film support F2 touching feed-out roller 64.
  • the sandwiching means F fed out by the feed-out roller 64 is transported to double-feed-preventing rollers 65a and 65b and further to registration rollers 53a and 53b in succession to be transported. Even in this case, film support F2 is in contact with roller 65a which is a driving roller in double-feed-preventing rollers 65a and 65b and thin film F2 is in contact with stationary roller 65b which is connected to a torque limiter and prevents double feeding. Therefore, no crease is created on the thin film F1 though the force for pulling the thin film is applied on it.
  • registration rollers 53a and 53b In a re-feeding mode, registration rollers 53a and 53b have only the function for feeding and film support F2 is in contact with driving roller 53a among registration rollers 53a and 53b, while thin film F1 is in contact with driven roller 53b. Therefore, the thin film F1, when it passes through the area of the registration roller 53a, is neither be creased nor be dog-eared.
  • Fig. 4 is an illustration showing the state of re-feeding at the transferring portion.
  • transferring belt 373 In a re-feeding mode, transferring belt 373 is positioned at the point (shown with dotted lines in Fig. 1) that is away from the photoreceptor drum 30 and rotates. Sandwiching means F is transported while keeping in contact with the transferring belt 373 and passes through the transferring section to move to adjoining conveyance belt 63. When the sandwiching means F passes through the transferring section, film support F2 faces the photoreceptor drum 30. If the sandwiching means F passes through the transferring section with thin film F1 facing the photoreceptor drum 30, the thin film F1 is attracted on an electrostatic manner to the charged photoreceptor drum 30, causing creases or, in the worst case, conveyance troubles caused by the attraction of the thin film.
  • Fig. 5 is a key portion diagram showing how a toner image is smoothed while sandwiching means F holding recording material T is being pinched and transported by rotating fixing rollers 70a and 70b in the fixing means 70.
  • Upper roller 70a of the fixing means in the present example is an aluminum tube with a thin wall having therein an infrared lamp as a heat source at the center thereof, whose external surface is covered with a PFA tube, and surface temperature of the upper roller is controlled to be at about 195°C by means of a sensor.
  • lower roller 70b is a roller having a superficial layer made of rubber material such as silicone rubber having a thickness of about 5 mm, and the surface of the lower roller is coated with Teflon.
  • the lower roller rotates while being in pressure-contact, through its rubber hardness of not more than surface hardness ASKER C 90°, with the upper roller 70a. Heat is conducted from the upper roller 70a to the lower roller 70b whose surface temperature is thereby kept at about 130°C.
  • Fig. 6 shows that the smoothness of the toner surface is improved after (b) re-feeding compared with (a) before re-feeding, and thereby, when illuminated, light is transmitted through toners and sharp color images are projected on a screen.
  • the inventors of the invention made tests changing conditions variously about the upper and lower rollers of a fixing means in which the sandwiching means F is subjected to re-fixing while being sandwiched.
  • the surface hardness of the roller facing the film support F2 needs to be harder than that of the roller facing the thin film F1
  • the desirable condition for the hardness of the roller facing the thin film F1 is 90° or less in surface hardness ASKER C.
  • the sandwiching means F after being subjected to re-fixing, is ejected and then cooled, and recording material T therein becomes available after being separated from the thin film F1.
  • an operation mode is changed from an image forming mode (copy mode) explained previously to a re-fixing mode when a re-fixing selection button provided on an operation panel of the apparatus is pressed.
  • a block diagram shown in FIg. 7 indicates a control circuit for the foregoing wherein, when the re-fixing selection button is pressed, image forming means such as charging, exposure, developing, transferring and cleaning means are caused to be out of operation, while only feeding operation through a manual insertion portion performed by a sheet feeding means and fixing operation of a fixing means are conducted. Programming is established so that sheet feeding speed and fixing speed in the re-fixing mode may be lower than those in the copy mode with regard to the sheet conveyance speed.
  • sandwiching means F fed out by feed-out roller 64 is conveyed along conveyance path 62 through double-feed-preventing rollers 65a and 65b as well as registration rollers 53a and 53b.
  • the registration rollers 53a and 53b have only the function of feeding in the re-fixing mode, and these feeding rollers rotate at a low speed to convey the sandwiching means F to a transferring means.
  • transferring belt 373 In a re-fixing mode, transferring belt 373 is positioned at the point that is away from the photoreceptor drum 30 and rotates. Sandwiching means F is transported while keeping in contact with the transferring belt 373 and passes through the transferring section to move to adjoining conveyance belt 63. In the re-fixing mode, image forming means are out of operation and photoreceptor drum 30 is suspended to be on a non-charged state. Further, charging means 374 for transferring is also out of operation. Therefore, the sandwiching means F is not contaminated by toners and others.
  • the thin film F1 is attracted in an electrostatic manner to the charging means, causing creases or, in the worst case, conveyance troubles caused by the attraction of the thin film.
  • image forming means are out of operation as in the invention, the sandwiching means F in which recording material T is sandwiched and held can be conveyed normally without causing the problems mentioned above.
  • rollers rotate at the linear speed of about 140 mm/sec and a toner image is conveyed thereby with its surface facing upper roller 70a for satisfactory fixing.
  • a toner image faces a fixing means in a manner contrary to that in a copy mode, and a linear speed of rollers is switched to the low speed of about 20 mm/sec. Therefore, when thin film F1 passes through the elastic lower roller 70b while touching it in the occasion that sandwiching means F is ejected after being subjected to re-fixing, it was observed that the smoothness on the toner surface of a toner image was changed for the better and light transmitting property and glossiness were improved.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Textile Engineering (AREA)
  • Fixing For Electrophotography (AREA)
  • Color Electrophotography (AREA)
EP19920308881 1991-10-11 1992-09-29 Image recording apparatus capable of smoothing toner images Withdrawn EP0536931A3 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP263923/91 1991-10-11
JP3263923A JPH05100595A (ja) 1991-10-11 1991-10-11 画像記録装置
JP266521/91 1991-10-15
JP3266521A JPH05107962A (ja) 1991-10-15 1991-10-15 画像記録装置

Publications (2)

Publication Number Publication Date
EP0536931A2 true EP0536931A2 (fr) 1993-04-14
EP0536931A3 EP0536931A3 (en) 1994-05-18

Family

ID=26546265

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19920308881 Withdrawn EP0536931A3 (en) 1991-10-11 1992-09-29 Image recording apparatus capable of smoothing toner images

Country Status (1)

Country Link
EP (1) EP0536931A3 (fr)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1519969A (en) * 1975-09-23 1978-08-02 Rank Xerox Ltd Electrostatographic printing
US4894680A (en) * 1987-06-08 1990-01-16 Brother Kogyo Kabushiki Kaisha Image recording apparatus
JPH01185688A (ja) * 1988-01-19 1989-07-25 Brother Ind Ltd 加熱定着方法
JPH01193884A (ja) * 1988-01-29 1989-08-03 Konica Corp カラー画像形成装置
JPH03228080A (ja) * 1990-02-01 1991-10-09 Matsushita Electric Ind Co Ltd カラー画像形成装置

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Publication number Publication date
EP0536931A3 (en) 1994-05-18

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