EP0361509A2 - Bildaufzeichnungsgerät mit einer Reinigungseinrichtung - Google Patents

Bildaufzeichnungsgerät mit einer Reinigungseinrichtung Download PDF

Info

Publication number
EP0361509A2
EP0361509A2 EP89118059A EP89118059A EP0361509A2 EP 0361509 A2 EP0361509 A2 EP 0361509A2 EP 89118059 A EP89118059 A EP 89118059A EP 89118059 A EP89118059 A EP 89118059A EP 0361509 A2 EP0361509 A2 EP 0361509A2
Authority
EP
European Patent Office
Prior art keywords
toner
forming apparatus
image
image forming
magnetic
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
Application number
EP89118059A
Other languages
English (en)
French (fr)
Other versions
EP0361509B1 (de
EP0361509A3 (en
Inventor
Nobuo Nakazawa
Akimitsu Hoshi
Nobuyuki Kume
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 Inc
Original Assignee
Canon 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 JP24234588A external-priority patent/JPH0291676A/ja
Priority claimed from JP24234388A external-priority patent/JPH0291675A/ja
Application filed by Canon Inc filed Critical Canon Inc
Publication of EP0361509A2 publication Critical patent/EP0361509A2/de
Publication of EP0361509A3 publication Critical patent/EP0361509A3/en
Application granted granted Critical
Publication of EP0361509B1 publication Critical patent/EP0361509B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G21/00—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge
    • G03G21/0005—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge for removing solid developer or debris from the electrographic recording medium
    • G03G21/0011—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge for removing solid developer or debris from the electrographic recording medium using a blade; Details of cleaning blades, e.g. blade shape, layer forming
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G21/00—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge
    • G03G21/0005—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge for removing solid developer or debris from the electrographic recording medium
    • G03G21/0047—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge for removing solid developer or debris from the electrographic recording medium using electrostatic or magnetic means; Details thereof, e.g. magnetic pole arrangement of magnetic devices

Definitions

  • the present invention relates to an image forming apparatus such as a electrophotographic copying machine, printer and the like, which utilizes an electrostatic recording process, and more particularly, it relates to an image forming apparatus having a cleaning means for cleaning the residual toner remained on an image bearing member.
  • the quality of the image is badly influenced not only by the toner adhered to the image bearing member, but also by foreign matters such as fine paper powder generated from the paper used as the transfer material, in most cases, with the image forming apparatus, organic components generated from such paper powder, and corona products generated due to the presence of a high voltage element such as a corona charger provided in the image forming apparatus, which are adhered to the image bearing member.
  • a high voltage element such as a corona charger provided in the image forming apparatus
  • the above-mentioned technique is more excellent in the points that the abrasion action is less localized or offset on the surface of the image bearing member due to the adhesion of the toner onto the web, rubber roller or the like, and the surface of the image bearing member is less damaged since the rubber roller and the like is not frictionally pressed against the image bearing member.
  • the above-mentioned technique can be applied to a photosensitive member in a so-called Carlson process wherein the charges are moved within the photosensitive layer during the exposure operation.
  • the magnet roller is rotated so that a portion of the magnet roller opposed to the image bearing member is moved in a direction opposited to a moving direction of the image bearing member.
  • the toner often filled up or overflowed from the cleaning device, the contaminating various parts in the image forming apparatus.
  • the color toner comprises colored dyes, pigments and transparent resins, and is normally non-magnetic.
  • the single component magnetic toner suitable for forming the black image is still often used.
  • the cleaning means utilizing the above-­mentioned magnet roller it is difficult to collect or catch the non-magnetic toner.
  • the non-collected toner was scattered into the apparatus, thus contaminating the various parts of the apparatus, or the non-collected toner was jammed between the magnet roller and the image bearing member, thus preventing the cleaning action.
  • an amorphous silicone photosensitive member has been widely used as a photosensitive layer for the surface of the image bearing member in a high speed copying machine and the like, since such amorphous silicone photosensitive member has a great mechanical strength and is durable.
  • the magnet roller often used for cleaning the magnetic toner is not used and the toner is removed only by the cleaning blade, the accumulation of the foreign matters as aforementioned, the poor cleaning action due to such accumulation of the foreign matters, the turning-over of the cleaning blade and/or the flow of the image cannot be prevented.
  • the magnet roller is rotated so that a portion of the magnet roller opposed to the image bearing member is moved in a direction opposite to a moving direction of the image bearing member.
  • the adequate amount of toner is used for completely coating the surface of the image to stably perform the cleaning action in this cleaning system, as mentioned above, when a great number of originals or manuscripts each of which uses or consumes relatively much toner are copied, the toner often overflows from the cleaning device and/or the magnetic toner is scattered during the collection thereof, thus contaminating various parts in the image forming apparatus.
  • An object of the present invention is to provide an image forming apparatus which can eliminate the above-­mentioned conventional drawbacks and can prevent the overflow of the toner from a cleaning device and the scattering of the toner.
  • Another object of the present invention is to provide an image forming apparatus having a cleaning means which can prevent the poor cleaning action and can always perform a stable cleaning action.
  • a further object of the present invention is to provide an image forming apparatus which can prevent the deterioration of image quality due to foreign matters on an image bearing member and can obtain a good image.
  • the other object of the present invention is to provide an image forming apparatus which can prevent the leakage of toner from a magnetic particle holding means for frictionally sliding the magnetic particles on an image bearing member.
  • Fig. 1 schematically shows an example of an electrophotographic apparatus embodying an image forming apparatus according to the present invention, which can perform two color record.
  • a drum-shaped image bearing member i.e., an electrophotographic photosensitive drum 1 having a light conductive layer such as an amorphous silicone layer arranged on a surface thereof is supported for rotational movement in a direction shown by the arrow A, and an image forming means is arranged around the drum. That is to say, around the photosensitive drum 1, a first charger 11, a first image exposure means 12, a first developing device 13, a second image exposure means 15, a second developing device 16, a transfer charger 17, and a cleaning means 2 are arranged. If necessary, a pre-exposure means (not shown) may be provided between the cleaning means 2 and the first charger 11.
  • the first and second image exposure means 12, 15 include a first semi-conductor laser unit 22 for emitting a first laser beam modulated by a first image signal, a second semi-conductor laser unit 23 for emitting a second laser beam, and a rotatable polygon mirror 24 driven by a motor 25, for deflecting the first and second laser beams and for raster scanning first and second images on the photosensitive drum 1 through a focusing lens 26 and a reflection mirror 27.
  • a second (or re-charging) charger 14 may be provided between the first developing device 13 and the second image exposure means 15.
  • the photosensitive drum 1 rotating in the direction A is uniformly charged by the first charger 11, for example, to the voltage of + 460 V.
  • a first latent image wherein the surface potential of an exposure portion thereof will be charged, for example, to the voltage of + 11 V is formed on the photosensitive drum 1 by means of the first exposure means 12.
  • the first latent image is developed as an inverse image by means of the first developing device 13 including, for example, red toner positively charged, by applying a bias current having an appropriate magnitude.
  • the red toner non-­magnetic toner having an average particle diameter of 10 - 13 ⁇ m
  • the non-magnetic toner is charged due to the friction charging by agitating the toner with carrier obtained by coating spherical ferrite particles constituting magnetic powder and having an average particle diameter of 40 - 50 ⁇ m in the first developing device 13.
  • the non-magnetic toner is held together with the carrier within a sleeve 13A incorporating a magnet therein.
  • the image formed on the photosensitive drum 1 is developed by applying the toner thereto by rotating the sleeve 13A.
  • the potential of the visualized red toner image is higher than the potential of the toner charge by about 100 V to have a value of about + 200 V.
  • a second image signal is introduced onto the photosensitive drum 1 by the second exposure means 15, whereby a second latent image wherein the surface potential of an exposure portion thereof will be charged, for example, to the voltage of + 90 V is formed on the photosensitive drum 1.
  • the second charger 14 may be provided so that the potential of the first toner image is increased up to the voltage of + 420 V by re-charging the photosensitive drum 1 after the first image is visualized, and then the second image exposure 15 is performed, thus decreasing the potential of the exposure portion thereof to the voltage of + 60 V.
  • the second latent image so formed is visualized by applying a bias current having an appropriate magnitude by means of the second developing device 16 including, for example, black toner.
  • the black toner is constituted by a single component magnetic toner obtained by mixing magnetite with resin and having an average particle diameter of 10 - 12 ⁇ m.
  • the transfer material 18 normally comprising a paper by means of the transfer charger 17.
  • the transfer material is separated from the photosensitive drum 1 by a separation charger 28, and then the image transferred to the transfer material is fixed onto the later by means of a fixing means 19. Thereafter, the transfer material is ejected out of the image forming apparatus as a two color print.
  • the photosensitive drum 1 is treated by the cleaning means 2 to remove the residual toner on the drum, and thereafter, is used again for the next image forming process.
  • Fig. 2 shows a side sectional view of the cleaning means 2.
  • the cleaning means 2 is arranged in parallel with and in the vicinity of the photosensitive drum 1 which is rotated around an axis perpendicular to a plane of Fig. 2 in the direction A.
  • a cleaning blade 3 as a cleaning member is arranged within the cleaning means 2, and an edge of a free end of the cleaning blade is pressed against the surface of the photosensitive drum 1 to remove the residual toner remaining on the latter without interfering with the transfer action in a transferring station (not shown).
  • a magnet roller 4 as a magnetic particle holding means is arranged with a gap of l mm between the photosensitive drum 1 and the magnet roller, and, as shown, a regulating member 6 for regulating a thickness of a layer of the magnetic particles formed on the magnetic roller 4 to a predetermined value is arranged in the vicinity of the magnetic roller 4 with a gap of d mm between the member 6 and the roller 4.
  • the magnetic toner reached the cleaning blade 3 of the cleaning means 2 is scraped off by the blade 3 to drop onto the magnet roller 4, and then is fed by the rotation of the roller 4 to reach the regulating member 6. And, a portion of the toner is attracted by the magnet roller 4 to form a magnetic brush comprising a magnetic particle layer and then reaches a position near the photosensitive drum 1, thus frictionally engaging with the drum surface to remove the materials adhered to the photosensitive drum 1, and then further reaches the cleaning blade 3 by the rotation of the photosensitive drum 1 to be stably supplied to the edge of the cleaning blade as a lubricant agent. Since such magnet roller has an ability for holding the magnetic toner by the magnetic force, it is possible to prevent the toner removed off the drum 1 from leaking out of the cleaning means 2.
  • the magnetic toner layer may be previously formed on the magnet roller.
  • the amorphous silicone was used as the photo­sensitive member, and the peripheral velocity of the photosensitive was selected to 300 mm/sec.
  • a magnet having magnetic flux density of 800 gauss and eight magnetic poles was used as the magnet roller, and was rotated so that a portion of the magnet roller opposed to the surface of the photosensitive member was moved in a direction opposite to the moving direction of the photosensitive member. In these conditions, the relation between the above-mentioned gaps d, l , and the different between the peripheral velocity of the photosensitive member and that of the magnet roller was examined.
  • Fig. 3 shows the condition that the toner of the magnetic brush formed on the magnet roller is dropped without being properly fed
  • Fig. 4 shows the condition that the toner is clogged or jammed.
  • the toner on the magnet roller 4 is moved in response to the rotation of the magnet roller, whereas the toner on the photosensitive member 1 is moved in response to the movement of the latter.
  • the velocity of the toner is an average between the velocity of the photosensitive member and that of the magnet roller.
  • the drop of the toner as mentioned above occurs when the amount of the toner fed between the photo­sensitive member 1 and the magnet roller 4 is greater than the amount of the toner which is to be fed to the cleaning blade 3 through the gap between the photo­sensitive member and the magnet roller. Accordingly, if the above-mentioned gap d is greater than the gap l, when the amount of the toner passing through the gap l is more than the amount of the supplied toner, the toner will not be dropped.
  • Figs. 5A to 5C show the relation between the gaps d, l and the drop of the toner due to the peripheral velocity of the magnet roller. That is to say, Fig. 5A shows the condition of the drop of the toner when the gaps d, l are varied in the case where the peripheral velocity of the magnet roller is the same as that of the photosensitive member, Fig. 5B shows the condition of the drop of the toner when the gaps d, l are varied in the case where the peripheral velocity of the magnet roller is an half of that of the photosensitive member, and Fig. 5C shows the condition of the drop of the toner when the gaps d, l are varied in the case where the peripheral velocity of the magnet roller is one-eighth of that of the photosensitive member.
  • the hatched zones each shows an available area where the toner is not dropped and thus remains on the magnet roller to frictionally slide on the photo­sensitive member.
  • the amount of the toner fed by the magnet roller is proportional to the peripheral velocity of the magnet roller, and the peripheral velocity more than a predetermined value is requested.
  • Fig. 6 shows the relation between the peripheral velocity of the magnet roller and the gap difference (h-d).
  • the toner clogging phenomenon largely depends upon the amount of the toner being fed by the rotation of the photosensitive member 1.
  • the amount of the toner being fed to the cleaning means as the residual toner when the black copy or solid image is copied, i.e., when the toner is adhered to the whole area of the copy paper of A4 size was referred to.
  • the hatched zone shown in Fig. 6 shows the no toner clogging area. It can be understood that the toner clogging is less generated as the peripheral velocity of the magnet roller is increased and as the distance between the cleaning blade and the magnet roller is increased.
  • the magnet roller is rotated so that the portion thereof opposed to the photosensitive member is moved in the direction opposite to the moving direction of the photosensitive member (the peripheral velocity of the photosensitive member V P > 0, the peripheral velocity of the magnet roller V M > 0), and only the peripheral velocity thereof (mm/sec) is referred to.
  • the residual non-magnetic toner remaining on the photosensitive member after passing through the transfer station has higher triboelectric charge (friction charge) than the magnetic toner without the carrier because the non-magnetic toner is frictionally contacted with not only the developing sleeve but also the carrier particles in the developing device.
  • Such non-magnetic toner is adhered to the photosensitive member with the predetermined tribo­electric charge or more, if the non-magnetic toner entrained by the magnetic brush formed on the magnet roller reaches to the photosensitive member, almost all of the non-magnetic toner is not entrained by the magnet roller but is fed by the photosensitive member 1 to reach the cleaning blade 3, where the toner is scraped off by the cleaning blade to drop onto the magnetic brush formed on the magnet roller surface, thus not leaking out of the cleaning device 2.
  • the non-magnetic toner dropped on the magnetic brush is fed toward the regulating member 6 positioned at the opposite side of the photosensitive member with being entrained by the magnetic brush, and then almost all of the toner is scraped by the regulating member and is discharged into a toner collecting container (not shown) by a screw feeder 5. Further, in consideration of the scattering of the non-magnetic toner within and out of the cleaning device, since the non-magnetic toner is fed with being supported by the magnet roller surface, it is desirable that the peripheral velocity of the magnet roller is slower, and it was found that such peripheral velocity be preferably one-third of the peripheral velocity of the photo­sensitive member or less.
  • the peripheral velocity of the magnet roller, and the gap d between the magnet roller and the regulating member for regulating the thickness of the toner layer in the image forming apparatus as mentioned above may be defined as timed average values, and thus, even if the magnet roller is rotated faster than the photosensitive drum or stopped for a very short time, or if the gap d is varied with the time, it was found that the same function as mentioned above could be achieved.
  • Fig. 7 shows an example of a speed reduction mechanism used in such case, where the reference numeral 61 designates a drive gear as a driving source.
  • a rocking lever 65 rotatably mounted on a one-way clutch 62 is fitted on a driven shaft 64 of the magnet roller.
  • the pin 63 is turned around the center of the gear to rock the rocking lever around the one-way clutch 62 in directions D and E alternately.
  • the rocking lever 65 is rocked in the direction E, the one-way clutch 62 is rotated in a direction F to intermittently rotate the driven shaft 64 of the magnet roller in the direction F.
  • a central shaft of the gear 61 may be used as a central shaft of the photosensitive drum.
  • the mechanism for suddenly or swiftly reducing the number of revolutions by using such one-way clutch by means of the high speed gear as the driving source merely requires a small space and is inexpensive, and thus is very advantageous.
  • the driven part is intermittently rotated, the variation of the rotation of the magnet roller with time will be as shown in Fig. 8.
  • the toner is not dropped and is not clogged, thus permitting the smooth cleaning operation.
  • the peripheral velocity of the magnet roller becomes faster than that of the photosensitive drum for a very short time, the toner is also not dropped and is also not clogged, thus permitting the smooth cleaning operation.
  • the above matter can be referred to the distance d between the magnet roller and the regulating member, and, therefore, there is no problem if the distance d is deviated from the above-mentioned value defined in the aforementioned embodiment for a very short time.
  • a regulating edge portion 6′a formed on the free end of a regulating blade 6′ for regulating an amount of the toner accumulated on the surface of the magnet roller 4 is arranged in a "positive direction" in confronting relation to the surface of the magnet roller 4 at the opposite side of the roller 4 with respect to the photosensitive member 1 with an appropriate gap therebetween.
  • positive direction means a direction that, when a tangential line is formed on the magnet roller at the position nearest to the regulating edge portion 6′a, an angle formed between the regulating edge portion 6′a and a segment of the tangential line upstream of the rotational direction of the magnet roller 4 becomes an acute angle.
  • the toner fed by the magnet roller 4 to the regulating blade 6′ is largely accummulated into a cavity formed between the regulating edge portion 6′a and the magnet roller 4, and only the toner overflowed out of the cavity is discharged by the screw feeder 5.
  • the amount of the toner collected to the cleaning device gradually reduced, thus reducing the amount of toner regulated by the regulating member 6, and, thus in the extreme case, a condition that all of the toner fed by the magnet roller 4 is again fed to the position near the photosensitive member 1 may be occur.
  • the toner is fed with being entrained by the magnet roller in a wave-shaped layer on the roller surface. In this case, merely the toner at the mountain portions of the toner layer is scraped off the regulating member 6, but the toner at the valley portions of the toner layer may not contact the regulating member 6.
  • the cavity into which the large amount of the toner can be accummulated is provided at the position where the magnetic toner entrained by the magnet roller is regulated by the regulating blade 6′.
  • the toner accummulated in the above-mentioned cavity is circulated in the cavity in a direction shown by the arrows C, since the magnet roller is always being rotated. Accordingly, the non-magnetic toner being fed to the cavity is mixed with the magnetic toner accummulated in the cavity, and thus, the ratio of the non-magnetic toner to the total toner will be decreased in comparison with the ratio of the non-magnetic toner when being fed. Further, since the non-magnetic toner is adhered to the magnetic toner by the agitating or mixing action and is fed at that condition to the position where the magnet roller is nearest the photosensitive member, the toner is not dropped and is not scattered.
  • Fig. 10 shows a further embodiment of the cleaning means.
  • the elements corresponding to those in the previous embodiment will be designated by the same reference numerals and the explanation thereof will be omitted.
  • a regulating roller 7 made of non-magnetic stainless steel material, for regulating the thickness of the toner layer is arranged in the vicinity of the magnet roller 4, which regulating roller 7 can be rotated slower than the magnet roller 4 in a direction shown by the arrow so that a portion of the regulating roller opposed to the magnet roller is moved in a direction opposite to the movement direction of the magnet roller. In this way, by rotating the regulating roller 7 slower than the magnet roller, it is possible to reduce the possibility of the drop of the toner between the magnet roller and the regulating roller.
  • the toner layer having the predetermined thickness is obstructed by the fact that the foreign matters such as the paper powder entrained together with the toner collected to the cleaning device are jammed between the regulating blade and the magnet roller (when such regulating blade is used as mentioned above).
  • a scraper 9 is arranged to cooperate with a portion of the regulating roller 7 and with a portion of the magnet roller 4, thereby defining the toner cavity. Further, the toner overflowed from the toner cavity beyond the scraper 9 due to the rotation of the regulating roller 7 is discharged to the toner collecting container through the screw feeder 5.
  • a partition 8 is provided for preventing the toner in the screw feeder 5 from returning back to the magnet roller 4.
  • the toner cavity is formed between the rollers 4 and 7, and thus, it is more advantageous in the point that the toner cavity can be enlarged more than that in the previous embodiment.
  • the magnetic brush may be formed by the aforementioned carrier (comprising iron powder).
  • the aforementioned carrier comprising iron powder.
  • the cleaning method using such carrier as the magnetic brush is adopted, there arises a problem that, since the adhesion force between the magnetic toner and the carrier is strong, it will be difficult to separate the magnetic toner from the carrier. Therefore, it is more preferable to form the magnetic brush by the magnetic toner as mentioned above.
  • both the black toner developer and the red toner developer may be comprised of two-­component toner consisting of the non-magnetic toner and the magnetic carrier, or may be comprised of single component toner consisting of the non-magnetic toner.
  • the magnet as the magnetic particle holding means is not limited to the cylindrical roller, but may be comprised of a plurality of magnets having a pluratily of magnet poles and arranged on an inner surface of a belt to form a magnetic brush which may have a longer contacting area between the magnetic brush and the photosensitive member than the contacting area when used the magnet roller.
  • amorphous silicone photosensitive member is used as the image bearing member
  • photosensitive material such as OPC or Se
  • OPC or Se may be used as the image bearing member.
  • the amorphous silicone photosensitive material since the foreign matters are apt to adhere to such material to worsen the image quality, it is desirable to remove the foreign matters by frictionally contacting the magnetic brush with such material.
  • the magnetic particle holding means is moved so that the portion thereof opposed to the image bearing member is shifted in the same direction as the moving direction of the image bearing member, and since the surface speed of the magnetic particle holding means is slower than that of the image bearing member, it is possible to prevent the toner from dropping and from overflowing out of the cleaning device.
  • the scattering of the non-magnetic toner can also be avoided by providing the toner cavity on the magnetic particle holding means to always afford the magnetic particle layer to the image bearing member stably.
  • the present invention by removing the foreign matters from the image bearing member, the deterioration of the image quality such as the flow of the image can be prevented, thus obtaining a good image.
  • the present invention relates to an image forming apparatus having cleaning means which frictionally contacts magnetic particles on a magnet roller with an image bearing member in order to remove foreign matters adhered to the image bearing member, thereby inhibitng the deterioration of the image quality.
  • cleaning means which frictionally contacts magnetic particles on a magnet roller with an image bearing member in order to remove foreign matters adhered to the image bearing member, thereby preventng the deterioration of the image quality.
  • the present invention by slowly rotating the magnet roller so that a portion thereof opposed to the image bearing member is moved in the same direction as a moving direction of the image bearing member, thus preventing the toner from overflowing and scattering out of the cleaning means.
  • the non-magnetic toner when the non-magnetic toner is used, by providing a toner cavity on the magnet roller, the scattering of the non-magnetic toner can be prevented, whereby the parts in the apparatus is prevented from being contaminated by the toner.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Cleaning In Electrography (AREA)
EP19890118059 1988-09-29 1989-09-29 Bildaufzeichnungsgerät mit einer Reinigungseinrichtung Expired - Lifetime EP0361509B1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP242343/88 1988-09-29
JP24234588A JPH0291676A (ja) 1988-09-29 1988-09-29 画像形成装置のクリーニング装置
JP24234388A JPH0291675A (ja) 1988-09-29 1988-09-29 画像形成装置のクリーニング装置
JP242345/88 1988-09-29

Publications (3)

Publication Number Publication Date
EP0361509A2 true EP0361509A2 (de) 1990-04-04
EP0361509A3 EP0361509A3 (en) 1990-12-19
EP0361509B1 EP0361509B1 (de) 1994-08-03

Family

ID=26535724

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890118059 Expired - Lifetime EP0361509B1 (de) 1988-09-29 1989-09-29 Bildaufzeichnungsgerät mit einer Reinigungseinrichtung

Country Status (2)

Country Link
EP (1) EP0361509B1 (de)
DE (1) DE68917237T2 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0691594A1 (de) * 1994-07-06 1996-01-10 Canon Kabushiki Kaisha Elektrografisches Gerät und Bilderzeugungsverfahren
US6920305B2 (en) * 2002-02-21 2005-07-19 Samsung Electronics Co., Ltd. Device for and method of cleaning photoreceptor medium of electrophotographic image forming apparatus

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3918808A (en) * 1972-12-21 1975-11-11 Ricoh Kk Photoreceptor cleaning device for electrophotographic copying apparatus of the dry cleaning agent type
DE3151219A1 (de) * 1980-12-23 1982-08-05 Canon K.K., Tokyo "reinigungseinrichtung"
JPS58130373A (ja) * 1982-01-29 1983-08-03 Fuji Xerox Co Ltd 多色電子写真法におけるトナ−回収方法
US4739370A (en) * 1983-11-16 1988-04-19 Canon Kabushiki Kaisha Cleaning device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3918808A (en) * 1972-12-21 1975-11-11 Ricoh Kk Photoreceptor cleaning device for electrophotographic copying apparatus of the dry cleaning agent type
DE3151219A1 (de) * 1980-12-23 1982-08-05 Canon K.K., Tokyo "reinigungseinrichtung"
JPS58130373A (ja) * 1982-01-29 1983-08-03 Fuji Xerox Co Ltd 多色電子写真法におけるトナ−回収方法
US4739370A (en) * 1983-11-16 1988-04-19 Canon Kabushiki Kaisha Cleaning device

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 7, no. 245 (P-233)(1390) 29 October 1983, & JP-A-58 130373 (FUJI XEROX K.K.) 03 August 1983, *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0691594A1 (de) * 1994-07-06 1996-01-10 Canon Kabushiki Kaisha Elektrografisches Gerät und Bilderzeugungsverfahren
US5667926A (en) * 1994-07-06 1997-09-16 Canon Kabushiki Kaisha Electrophotographic apparatus and image forming process
US6920305B2 (en) * 2002-02-21 2005-07-19 Samsung Electronics Co., Ltd. Device for and method of cleaning photoreceptor medium of electrophotographic image forming apparatus

Also Published As

Publication number Publication date
EP0361509B1 (de) 1994-08-03
DE68917237T2 (de) 1994-12-01
EP0361509A3 (en) 1990-12-19
DE68917237D1 (de) 1994-09-08

Similar Documents

Publication Publication Date Title
US5606408A (en) Image forming apparatus and cleaning device therefor
US7315711B2 (en) Image forming apparatus, process cartridge and cleaningless system
US5740494A (en) Configured to enhance toner collecting efficiency and toner redepositing efficiency
US4686934A (en) Developing device
US5003354A (en) Method of removing a film from an image carrier of an image forming apparatus
US5249025A (en) Image forming apparatus having cleaning means
US6026266A (en) Developing apparatus using one-component toner
US5581337A (en) Developing apparatus and image forming apparatus employing mixing balls in the cartridge supply container
JP2003036011A (ja) クリーニング装置及び画像形成装置
JPH09288426A (ja) 画像形成装置
EP1467261B1 (de) Bildformungsgerät zur Verhinderung von Bildschäden verursacht durch gefallene leitende Bürsten und verstreuter Entwickler
EP0361509B1 (de) Bildaufzeichnungsgerät mit einer Reinigungseinrichtung
JPH11237788A (ja) 画像形成装置
US5479246A (en) Developing device having a photosensitive element carrier recovery unit
JP2000131973A (ja) 画像形成装置
JP3447880B2 (ja) 現像装置
JP2004093589A (ja) 画像形成方法及び装置
JP3539993B2 (ja) 画像形成装置
JP3024125B2 (ja) クリーニング装置
JP2987257B2 (ja) 画像形成装置
JPS631583B2 (de)
JPH012083A (ja) 感光体クリ−ニング装置
JPH1097117A (ja) 帯電装置
JP3099924B2 (ja) 画像形成装置におけるトナー回収方法
JP3271773B2 (ja) 現像装置

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): DE FR GB IT

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): DE FR GB IT

17P Request for examination filed

Effective date: 19901221

17Q First examination report despatched

Effective date: 19920724

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR GB IT

REF Corresponds to:

Ref document number: 68917237

Country of ref document: DE

Date of ref document: 19940908

ITF It: translation for a ep patent filed

Owner name: SOCIETA' ITALIANA BREVETTI S.P.A.

ET Fr: translation filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20070927

Year of fee payment: 19

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20070926

Year of fee payment: 19

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: IT

Payment date: 20070926

Year of fee payment: 19

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20070914

Year of fee payment: 19

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20080929

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20090529

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20080929

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20090401

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20080930

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20080929