WO2014010123A1 - Cartouche de traitement - Google Patents

Cartouche de traitement Download PDF

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Publication number
WO2014010123A1
WO2014010123A1 PCT/JP2012/080835 JP2012080835W WO2014010123A1 WO 2014010123 A1 WO2014010123 A1 WO 2014010123A1 JP 2012080835 W JP2012080835 W JP 2012080835W WO 2014010123 A1 WO2014010123 A1 WO 2014010123A1
Authority
WO
WIPO (PCT)
Prior art keywords
cartridge
photosensitive drum
developing
roller
drum
Prior art date
Application number
PCT/JP2012/080835
Other languages
English (en)
Japanese (ja)
Inventor
啓城 森
Original Assignee
ブラザー工業株式会社
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
Application filed by ブラザー工業株式会社 filed Critical ブラザー工業株式会社
Priority to CN201290001280.2U priority Critical patent/CN204807921U/zh
Publication of WO2014010123A1 publication Critical patent/WO2014010123A1/fr

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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
    • G03G21/16—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements
    • G03G21/18—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements using a processing cartridge, whereby the process cartridge comprises at least two image processing means in a single unit
    • G03G21/1803—Arrangements or disposition of the complete process cartridge or parts thereof
    • G03G21/1817—Arrangements or disposition of the complete process cartridge or parts thereof having a submodular arrangement
    • G03G21/1821—Arrangements or disposition of the complete process cartridge or parts thereof having a submodular arrangement means for connecting the different parts of the process cartridge, e.g. attachment, positioning of parts with each other, pressure/distance regulation

Definitions

  • the present invention relates to a process cartridge mounted on an image forming apparatus such as a laser printer.
  • Patent Document 1 As an image forming apparatus, as described in Patent Document 1, there is known a printer that is detachably provided with a process cartridge including a drum cartridge and a developing cartridge that is detachably provided on the drum cartridge.
  • Such a printer includes a scanner unit, the drum cartridge includes a photosensitive drum and a scorotron charger, and the developing cartridge includes a toner storage chamber, a supply roller, a developing roller, and a layer thickness regulating blade.
  • the toner filled in the toner storage chamber is supplied to the developing roller by the supply roller. At this time, the toner is frictionally charged by the supply roller and the developing roller. Thereafter, the toner is carried in a thin layer on the surface of the developing roller by a layer thickness regulating blade.
  • the surface of the photosensitive drum is uniformly charged by a scorotron charger, and then exposed by a scanner unit provided in the printer, whereby an electrostatic latent image is formed on the surface of the photosensitive drum.
  • a scorotron charger a scorotron charger
  • a scanner unit provided in the printer
  • an electrostatic latent image is formed on the surface of the photosensitive drum.
  • the toner carried in a thin layer on the developing roller is supplied to the electrostatic latent image on the surface of the photosensitive drum, visualized, and is formed on the surface of the photosensitive drum. Carries a toner image.
  • an object of the present invention is to provide a process cartridge in which a developing cartridge can be exchanged without directly touching an old developer and a new developer.
  • a process cartridge of the present invention includes a photosensitive cartridge having a photosensitive drum, and a developing cartridge configured to be attached to the photosensitive cartridge. And a cartridge housing portion configured to be mounted with the developing cartridge, wherein the developing cartridge is configured to come into contact with the photosensitive drum in a mounted state mounted on the cartridge housing portion, and the rotation of the developing roller And a cartridge housing portion including a first wall facing the developing cartridge in the mounted state from the outside in the axial direction of the developing roller, and the first wall is for mounting the developing cartridge. And a first guide part for guiding the protrusion, wherein the first guide part is a rotation center of the photosensitive drum, and A line segment connecting the rotational center of the developing roller Chakujotai, are formed along a direction crossing.
  • the first guide portion is configured so that the rotation center of the photosensitive drum and The developing roller is formed along the intersecting intersecting direction with the line connecting the rotation centers of the mounted developing roller, so that the developing roller is not separated immediately from the photosensitive drum but is rubbed against the photosensitive drum. Therefore, the photosensitive drum can be rotated.
  • the developing roller can be brought into contact with the photosensitive drum at a position different from the nip portion of the used developing cartridge with the developing roller in the photosensitive drum.
  • the photosensitive drum also includes a friction member for restricting its rotation, and the frictional force of the friction member is a frictional force applied to the photosensitive drum by the developing roller when the developing cartridge is detached from the photosensitive cartridge. It may be set smaller.
  • the frictional force generated by the rubbing of the developing roller against the photosensitive drum can be reliably applied to the photosensitive drum.
  • the developer may be a pulverized toner.
  • the pulverized toner is interposed in the nip portion between the photosensitive drum and the developing roller, whereby the frictional force between the photosensitive drum and the developing roller can be improved.
  • a second guide portion may be provided that continuously extends from the first guide portion and extends toward the opposite side of the photosensitive drum and bends toward the downstream side in the direction in which the developer cartridge is detached.
  • the photosensitive cartridge may further include a pressing member that presses the developing cartridge toward the photosensitive drum.
  • the developing roller provided in the developing cartridge is always pressed against the photosensitive drum by the pressing member.
  • the developing roller and the photosensitive drum can be reliably brought into contact with each other in the mounted state.
  • the rotation center of the developing roller may be disposed upstream of the imaginary line passing through the rotation center of the photosensitive drum and parallel to the intersecting direction in the detached state of the developing cartridge in the mounted state.
  • the developing roller is disposed upstream of the imaginary line passing through the rotation center of the photosensitive drum and parallel to the intersecting direction, so that the developing cartridge is positioned on the upstream side of the developing cartridge.
  • the developing roller and the photosensitive drum can be rubbed more reliably.
  • the developing cartridge can be exchanged without directly touching the old developer and the new developer.
  • FIG. 1 is a side sectional view showing an embodiment of a printer.
  • 2A is a perspective view seen from the upper left side of the drum cartridge shown in FIG. 1
  • FIG. 2B is a perspective view seen from the upper left side of the developing cartridge shown in FIG.
  • FIG. 3 is a front sectional view of the photosensitive drum shown in FIG.
  • FIG. 4 is an explanatory diagram for explaining attachment and detachment of the developing cartridge shown in FIG. 2 with respect to the drum cartridge.
  • FIG. 4A is a left side view of the developing cartridge mounted
  • FIG. FIG. 6 is a left side sectional view of the developing cartridge mounted.
  • FIG. 5 is an explanatory diagram for explaining attachment / detachment of the developing cartridge to / from the drum cartridge following FIG. 4, and FIG.
  • FIG. 5 (a) is a left side view of the developing cartridge in the middle of attachment / detachment.
  • FIG. 4 is a left side sectional view of the developing cartridge in the middle of attachment / detachment.
  • FIG. 6 is an explanatory diagram for explaining attachment / detachment of the developing cartridge to / from the drum cartridge subsequent to FIG. 5, and
  • FIG. 6 (a) is a left side view of the developing cartridge in the middle of attachment / detachment.
  • FIG. 4 is a left side sectional view of the developing cartridge in the middle of attachment / detachment.
  • FIG. 7 is an explanatory view for explaining attachment and detachment of the developing cartridge with respect to the drum cartridge following FIG.
  • FIG. 6 wherein (a) is a left side view in a state where the developing cartridge is detached, and (b) FIG. 4 is a left side sectional view in a state where the developing cartridge is detached.
  • FIG. 8 is an enlarged view of main parts of the photosensitive drum and the developing roller shown in FIG.
  • the printer 1 includes a main body casing 2 having a substantially box shape.
  • the printer 1 includes a paper feeding unit 3 for feeding the paper S and an image forming unit 4 for forming an image on the fed paper S in the main body casing 2.
  • the main body casing 2 is formed with a cartridge opening 5 for attaching / detaching a process cartridge 15 (described later) and a paper opening 6 for introducing the paper S.
  • the cartridge opening 5 is formed through the upper end of the main casing 2 in the vertical direction.
  • the paper opening 6 is formed to penetrate in the front-rear direction at the lower end of the front end of the main casing 2.
  • the main body casing 2 is provided with a top cover 7 at its upper end and a paper feed cover 8 at its front end.
  • the top cover 7 is provided with a paper discharge tray 41 from which the paper S is discharged.
  • the top cover 7 is provided to be swingable (movable) between a closed position for closing the cartridge opening 5 and an open position for opening the cartridge opening 5 with the rear end as a fulcrum.
  • the paper feed cover 8 is swingably (moved) between a first position where the paper opening 6 is closed and a second position where the paper opening 6 is opened with the lower end of the paper supply cover 8 as a fulcrum.
  • the paper feed unit 3 includes a paper placement unit 9 provided at the bottom of the main casing 2.
  • the paper stacking portion 9 is communicated with the outside of the main casing 2 through the paper opening 6.
  • the sheet S is stacked on the upper surface of the sheet feed cover 8 while the sheet feed cover 8 is disposed at the second position, and the rear part is loaded on the sheet via the sheet opening 6. Stacked in the placement unit 9.
  • the paper feeding unit 3 includes a pickup roller 11 disposed on the upper side of the rear end portion of the paper placing unit 9, a paper feeding roller 12 disposed on the rear side of the pickup roller 11, and a rear lower side of the paper feeding roller 12.
  • the sheet feeding pad 13 is disposed opposite to the sheet feeding side, and the sheet feeding path 14 extends continuously upward from the rear end portion of the sheet feeding pad 13.
  • (3) Image Forming Unit The image forming unit 4 includes a process cartridge 15, a scanner unit 16, and a fixing unit 17. (3-1) Process Cartridge
  • the process cartridge 15 is configured to be detachable from the main casing 2 and is mounted on the main casing 2 above the rear portion of the paper feed unit 3.
  • the process cartridge 15 includes a drum cartridge 18 as an example of a photosensitive cartridge configured to be detachable from the main body casing 2, and a developing cartridge 19 configured to be detachable from the drum cartridge 18.
  • the drum cartridge 18 includes a photosensitive drum 20, a transfer roller 21, and a scorotron charger 22.
  • the photosensitive drum 20 is formed in a cylindrical shape that is long in the left-right direction, and includes a photosensitive drum shaft 43 and a drum 44 that is supported by the photosensitive drum shaft 43 and has a photosensitive layer formed on the surface thereof.
  • the rear portion of 18 is rotatably provided.
  • the transfer roller 21 is formed in a substantially cylindrical shape extending in the left-right direction, and is pressed against the photosensitive drum 20 from the rear side.
  • the transfer roller 21 is disposed on the rear side of the photosensitive drum 20 so that the axial center thereof is positioned slightly below the axial center of the photosensitive drum 20.
  • the lower end edge of the transfer roller 21 is disposed above the lower end edge of the photosensitive drum 20.
  • an imaginary line segment (not shown) connecting the axis center of the transfer roller 21 and the axis center of the photosensitive drum 20 and an imaginary straight line (not shown) extending horizontally along the front-rear direction are formed.
  • the acute angle formed is about 3 °. Therefore, the pressure (transfer pressure) at which the transfer roller 21 is pressed against the photosensitive drum 20 is not affected by the weight of the transfer roller 21.
  • the scorotron charger 22 is disposed opposite to the front upper side of the photosensitive drum 20 with an interval.
  • the scorotron charger 22 is disposed with a space in the circumferential direction of the photosensitive drum 20 with respect to the transfer roller 21, and is an imaginary link between the axial center of the photosensitive drum 20 and the axial center of the transfer roller 21. And an imaginary line segment (not shown) connecting the axial center of the photosensitive drum 20 and the charging wire 23 (described later) is about 120 °. Has been placed.
  • the scorotron charger 22 includes a charging wire 23 and a grid 24.
  • the charging wire 23 is stretched so as to extend in the left-right direction, and is opposed to the front upper side of the photosensitive drum 20 with an interval.
  • the grid 24 is formed in a substantially U shape in a side view opened toward the front upper side, and is provided so as to surround the charging wire 23 from the rear lower side.
  • the developing cartridge 19 is disposed on the lower front side of the photosensitive drum 20 and includes a developing frame 25.
  • a toner storage chamber 26 and a developing chamber 27 are formed side by side.
  • the toner storage chamber 26 and the developing chamber 27 are formed to have substantially the same volume, and communicate with each other through a communication port 28.
  • the toner storage chamber 26 stores toner as an example of a developer.
  • the toner is a pulverized toner that is formed in an irregular shape instead of a spherical shape.
  • An agitator 29 is provided at a substantially central portion of the toner storage chamber 26 in the front-rear and up-down directions. That is, the agitator 29 is disposed below the photosensitive drum 20.
  • a supply roller groove 30, a developing roller facing surface 31, and a lower film attaching surface 32 are formed on the upper surface of the lower wall.
  • the supply roller groove 30 has a substantially semicircular shape along the peripheral surface of a supply roller 33 (described later), and is formed so as to be recessed downward in the rearward direction.
  • the developing roller facing surface 31 has a substantially arc shape along the peripheral surface of the developing roller 34 (described later), and is formed so as to continuously extend rearward from the rear end portion of the supply roller groove 30.
  • the lower film attaching surface 32 is formed so as to continuously extend rearward from the rear end portion of the developing roller facing surface 31. That is, the lower film attaching surface 32 is disposed above the developing roller facing surface 31.
  • the lower film attachment surface 32 is disposed to face the lower portion of the photosensitive drum 20 with a space in the vertical direction, and overlaps the axial center of the photosensitive drum 20 when projected in the vertical direction. Is arranged.
  • the developing chamber 27 is provided with a supply roller 33, a developing roller 34, a layer thickness regulating blade 35, and a lower film 36.
  • the supply roller 33 includes a supply roller shaft 50 and a sponge roller 51 that covers the supply roller shaft 50, and is provided at the front portion of the developing chamber 27 so that the lower portion thereof is disposed in the supply roller groove 30. It is provided so as to be rotatable. Thus, the supply roller 33 is disposed on the rear side of the toner storage chamber 26 and is disposed at substantially the same height as the toner storage chamber 26 in the vertical direction.
  • the developing roller 34 includes a developing roller shaft 52 and a rubber roller 53 that covers the developing roller shaft 52, and the peripheral surface of the lower portion thereof and the developing roller facing surface 31 are opposed to each other with a space therebetween.
  • the developing chamber 27 is rotatably provided at a rear portion.
  • the developing roller 34 is provided so as to come into contact with the supply roller 33 from the upper rear side, and its upper and rear portions are exposed from the developing chamber 27, and contact the photosensitive drum 20 from the lower front side. Yes. That is, the developing roller 34 is disposed on the rear upper side of the supply roller 33 and on the front lower side of the photosensitive drum 20.
  • the axial center of the supply roller 33, the axial center of the developing roller 34, and the axial center of the photosensitive drum 20 are located on substantially the same straight line along the radial direction of the photosensitive drum 20.
  • the developing roller 34 is disposed at a distance from the scorotron charger 22 in the circumferential direction of the photosensitive drum 20.
  • the developing roller 34 is a virtual line segment (not shown) connecting the shaft center of the photosensitive drum 20 and the charging wire 23, and a virtual line connecting the shaft center of the photosensitive drum 20 and the shaft center of the developing roller 34.
  • the line segment (not shown) forms an angle of about 120 °. That is, the developing roller 34, the scorotron charger 22, and the transfer roller 21 are arranged at substantially equal intervals in the circumferential direction of the photosensitive drum 20.
  • the upper end portion of the layer thickness regulating blade 35 is fixed to the rear end portion of the upper wall of the developing chamber 27, and the lower end portion thereof is in contact with the developing roller 34 from the front side.
  • the rear portion of the lower film 36 is fixed to the lower film attaching surface 32, and the front end thereof is in contact with the peripheral surface of the developing roller 34 above the developing roller facing surface 31.
  • (3-2) Scanner Unit The scanner unit 16 is disposed on the front side of the process cartridge 15 so as to face the photosensitive drum 20 with a space in the front-rear direction.
  • the scanner unit 16 emits a laser beam L toward the photosensitive drum 20 based on the image data to expose the peripheral surface of the photosensitive drum 20.
  • the laser beam L is emitted backward from the scanner unit 16 to expose the peripheral surface at the front end portion of the photosensitive drum 20. That is, the exposure point at which the photosensitive drum 20 is exposed (the peripheral surface at the front end portion of the photosensitive drum 20) is opposite to the portion where the photosensitive drum 20 and the transfer roller 21 are in contact with the axial center of the photosensitive drum 20. Is set.
  • the developing cartridge 19 is arranged below the emission locus of the laser beam L, and the scorotron charger 22 is arranged above the emission locus of the laser beam L.
  • a guide portion 37 for guiding the attachment / detachment of the process cartridge 15 is provided on the inner side surface of the main body casing 2 between the scanner unit 16 and the photosensitive drum 20.
  • the process cartridge 15 is guided by the guide portion 37, so that the developing cartridge 19 attached to the drum cartridge 18 has a lower emission locus of the laser beam L. Pass from the top to the top.
  • the fixing unit 17 is disposed above the rear portion of the drum cartridge 18. Specifically, the fixing unit 17 includes a heating roller 38 disposed above the scorotron charger 22 and a pressure roller 39 pressed against the heating roller 38 from the rear upper side.
  • the heating roller 38 is disposed in the vicinity of the upper end portion (open end portion) of the grid 24 of the scorotron charger 22.
  • Image Forming Operation The toner in the toner storage chamber 26 of the developing cartridge 19 is supplied to the supply roller 33 through the communication port 28 by the rotation of the agitator 29, and further supplied to the developing roller 34. Between 33 and the developing roller 34, it is triboelectrically charged to the positive polarity.
  • the toner supplied to the developing roller 34 is regulated by the layer thickness regulating blade 35 as the developing roller 34 rotates, and is carried on the surface of the developing roller 34 as a thin layer having a constant thickness.
  • the surface of the photosensitive drum 20 is uniformly charged by the scorotron charger 22 and then exposed by the scanner unit 16. Thereby, an electrostatic latent image based on the image data is formed on the peripheral surface of the photosensitive drum 20.
  • the toner carried on the developing roller 34 is supplied to the electrostatic latent image on the circumferential surface of the photosensitive drum 20, so that a toner image (developer image) is carried on the circumferential surface of the photosensitive drum 20.
  • the sheets S stacked on the sheet loading unit 9 are sent between the sheet feeding roller 12 and the sheet feeding pad 13 by the rotation of the pickup roller 11 and are turned one by one by the rotation of the sheet feeding roller 12. Thereafter, the paper S that has been squeezed is conveyed to the paper feed path 14 by the rotation of the paper feed roller 12 and is imaged one by one at a predetermined timing (between the photosensitive drum 20 and the transfer roller 21). Paper is fed to
  • the sheet S is conveyed between the photosensitive drum 20 and the transfer roller 21 from the lower side to the upper side. At this time, the toner image is transferred onto the paper S to form an image.
  • the sheet S is heated and pressed when it passes between the heating roller 38 and the pressure roller 39. At this time, the image is thermally fixed on the paper S.
  • the paper S is conveyed toward the paper discharge roller 40 and is discharged onto the paper discharge tray 41 of the main casing 2 by the paper discharge roller 40.
  • the process cartridge 15 includes a drum cartridge 18 and a developing cartridge 19 as shown in FIG. 4A.
  • Drum Cartridge The drum cartridge 18 includes a drum frame 58.
  • the drum frame 58 includes a pair of side walls 59 as an example of a first wall, a lower wall 60, a front wall 61, and an upper wall 62. And a transfer roller support wall 63.
  • the pair of side walls 59 are formed in a substantially flat plate shape having a substantially L shape in a side view and extending upward in the rear portion and extending forward in the front portion, and are arranged to face each other with a space therebetween.
  • a rear side portion of the side wall 59 is formed with a drum shaft insertion hole 64 that is penetrated along the left-right direction at the approximate center in the vertical direction and that can receive the photosensitive drum shaft 43 of the photosensitive drum 20 in a side view. Yes.
  • the right side wall 59 is provided with a lock lever 65 that regulates the separation of the developing cartridge 19 from the drum cartridge 18.
  • the lower wall 60 is formed in a substantially flat plate shape extending in the left-right direction and extending between the lower ends of the side walls 59.
  • the lower wall 60 includes a plurality (two) of contacted portions 66 at both ends in the left-right direction.
  • the contacted portion 66 provided at the right end portion of the drum cartridge 18 is not shown in FIG. 2B, but has the same configuration as the contacted portion 66 provided at the left end portion of the drum cartridge 18.
  • the contacted portion 66 is formed in a substantially rectangular flat plate shape that projects from the upper surface of the front end portion of the lower wall 60 toward the front upper side.
  • the free end portion of the contacted portion 66 is chamfered in a substantially arc shape in cross-sectional view.
  • the front wall 61 is formed in a substantially flat plate shape extending continuously upward from the front end portion of the lower wall 60 and extending between the front end portions of the side walls 59 as shown in FIG.
  • the front wall 61 includes an extending part 68, a drum gripping part 69, and a pressing member 72.
  • the extending portion 68 is formed in a substantially flat plate shape that protrudes upward from the upper end portion of the front wall 61 at the substantially center in the left-right direction and extends in the left-right direction.
  • the drum gripping portion 69 is formed in a substantially rectangular tube shape that is long in the left-right direction so as to protrude rearward from the rear surface of the center of the extending portion 68 in the left-right direction.
  • the pressing member 72 includes a cylindrical member 73 and a spring member 75 as shown in FIG.
  • the cylindrical member 73 is formed in a substantially bottomed rectangular tube shape with the rear end portion closed.
  • a bulging portion 74 is integrally provided on the rear end surface of the cylindrical member 73.
  • the bulging portion 74 is formed in a substantially circular arc shape in sectional view that bulges from the substantially central portion of the rear end surface of the cylindrical member 73 toward the rear side.
  • the spring member 75 is a compression coil spring extending in the front-rear direction.
  • the rear end portion of the spring member 75 is in contact with the inner surface (front surface) of the rear end portion of the cylindrical member 73 from the front side.
  • the front end portion of the spring member 75 is in contact with the rear surface of the front wall 61 from the rear side. Thereby, the cylinder member 73 is always urged toward the rear side by the urging force of the spring member 75.
  • the upper wall 62 is installed between the upper ends of the rear portions of the side walls 59.
  • the transfer roller support wall 63 is formed so as to bulge rearward from the rear ends of the side walls 59.
  • the transfer roller support wall 63 extends forward from both left and right ends of the support rear wall 77 (see FIG. 4B) having a substantially U shape in cross section and a pair of side walls 59. And a support side wall 78 connected to the front end.
  • the drum accommodating portion 80 is defined by the rear portion of the pair of side walls 59, the upper wall 62, the lower wall 60 facing the upper wall 62, and the transfer roller support wall 63.
  • a photosensitive drum 20, a transfer roller 21, and a scorotron charger 22 are supported in the drum housing portion 80.
  • the photosensitive drum 20 is rotatably supported by the pair of side walls 59 by inserting the photosensitive drum shaft 43 through the drum shaft insertion holes 64 of the pair of side walls 59. ing.
  • the photosensitive drum shaft 43 of the photosensitive drum 20 protrudes outward in the left-right direction of the pair of side walls 59.
  • a friction member 45 is disposed between the photosensitive drum shaft 43 and the drum 44 at the right end of the photosensitive drum 20.
  • the friction member 45 includes a drum side flange 46, a side wall side flange 47, and a spring 48.
  • the drum side flange 46 is formed in a substantially cylindrical shape whose left end is closed.
  • the drum-side flange 46 has an outer diameter that is substantially the same (slightly smaller) as the inner diameter of the drum 44, and an insertion hole through which the photosensitive drum shaft 43 can be inserted is formed at the center of the closed portion. Yes.
  • the drum side flange 46 is fixed to the right end portion of the drum 44 so as not to be relatively rotatable.
  • the side wall side flange 47 is formed in a substantially cylindrical shape whose right end is closed.
  • the side wall side flange 47 has an outer diameter that is substantially the same diameter (slightly smaller) as the inner diameter of the drum side flange 46, and an insertion hole through which the photosensitive drum shaft 43 can be inserted is formed in the central portion of the closed portion.
  • the side wall side flange 47 is in contact with the right side wall 59 so as to be relatively rotatable.
  • the side wall side flange 47 is fitted to the drum side flange 46 from the right side so that the spring 48 is accommodated in the inner space.
  • the photosensitive drum 20 is pressed in the left-right direction at the rear portion of the drum cartridge 18 so that the left side surface of the drum 44 and the left side wall 59 come into contact with each other, and the right side surface and the right side wall 59 of the side wall flange 47 are contacted. Is supported so as to be able to rotate while being restricted in rotation by the frictional force generated by the contact with each other.
  • the transfer roller 21 is accommodated in a transfer roller support wall 63 and is rotatably supported by a pair of support side walls 78.
  • the scorotron charger 22 is supported by the upper wall 62.
  • a cartridge mounting portion 81 as an example of a cartridge housing portion is defined by a front portion of the pair of side walls 59, a lower wall 60, and a front wall 61.
  • the cartridge mounting portion 81 is formed in a substantially bottomed rectangular frame shape that communicates with the drum housing portion 80 and is opened upward.
  • (1-2) Guide Rails A pair of side walls 59 are partitioned (formed) for guiding rails 83 for guiding attachment / detachment of the developing cartridge 19 with respect to the drum cartridge 18.
  • Each guide rail 83 is formed between the upper end portion of the front portion of the corresponding side wall 59 and the front end portion of the rear portion.
  • the upper end portion of the front portion of the guide rail 83 extends along the front-rear direction, and the front end portion of the rear portion of the guide rail 83 extends along the vertical direction.
  • the guide rail 83 includes a guide surface 84 as an example of a second guide part and a guide groove 85 as an example of a first guide part.
  • the guide surface 84 is formed at the upper end portion of the front portion of the side wall 59 so as to be inclined downward toward the rear side.
  • the guide groove 85 is formed in a substantially C shape in a side view in which the front is opened and cut out toward the rear side above the portion connected to the front portion in the rear portion of the side wall 59.
  • the guide groove 85 is formed with a locking portion 86 having a substantially rectangular shape in a side view projecting rearward and downward from a front end portion on the upper side thereof.
  • the guide groove 85 has a lower surface 87 and an upper surface 88 defined therein.
  • the lower surface 87 is continuous from the rear end portion of the guide surface 84 and is inclined upward as it goes to the rear side.
  • the upper surface 88 opposes the upper surface of the lower surface 87 with an interval, and is inclined upward along with the lower surface of the locking portion 86 toward the rear side in parallel with the lower surface 87.
  • the groove width of the guide groove 85 (the length between the lower surface 87 and the upper surface 88) is formed to be approximately the same length (slightly longer) as the outer diameter of the collar member 54 (described later).
  • front end surface of the rear portion of the side wall 59 is partitioned as a contacted surface 89 extending along the vertical direction.
  • the developing cartridge 19 includes the developing frame 25 and a drive unit 93 disposed on the left side of the developing frame 25.
  • a power supply unit (not shown) having electrodes for applying a bias to the supply roller 33 and the development roller 34 is provided on the right side of the development frame 25.
  • (2-1) Development Frame The development frame 25 is formed in a substantially box shape extending in the left-right direction. Specifically, the developing frame 25 includes a pair of side walls 96, a lower wall 97, a front wall 98, and an upper wall 99.
  • the pair of side walls 96 are opposed to each other with a space therebetween so as to sandwich the toner storage chamber 26 therebetween.
  • the side wall 96 is formed in a substantially flat plate shape that is substantially rectangular in a side view.
  • the lower wall 97 extends in the left-right direction, extends between the lower end portions of the side walls 96, and is formed along the supply roller groove 30, the developing roller facing surface 31, and the lower film attaching surface 32 in the rear portion.
  • the front portion thereof is formed in a substantially circular arc shape in a sectional view along the rotation locus of the agitator 29.
  • the lower wall 97 includes a plurality (two pairs) of pressed parts 100 and a plurality (two) contact parts 101 at both ends in the left-right direction.
  • the pressed portion 100 and the contact portion 101 provided at the left end of the developing cartridge 19 are not shown in FIG. 2B, but the pressed portion 100 and the contact portion 101 provided at the right end of the developing cartridge 19 are not shown. It is the same composition as.
  • Each of the plurality of pairs of pressed portions 100 is provided in a pair at each of the left and right ends of the lower wall 97 corresponding to each of the plurality of pressing members 72.
  • the pair of pressed parts 100 are arranged to face each other with an interval in the left-right direction.
  • the pressed portion 100 is a flat plate having a substantially triangular shape in a side view having a top portion that faces the front lower side so as to protrude from the lower surface of the front end portion of the lower wall 97 toward the front lower side. It is formed into a shape.
  • the pressed portion 100 has a front end edge slightly inclined toward the rear side as it goes downward, and a lower end edge thereof is inclined downward as it goes toward the rear side.
  • a plurality of contact portions 101 are provided one by one between the rear end portions of the pair of pressed portions 100 as shown in FIG.
  • the contact portion 101 is formed in a substantially triangular flat plate shape having a top portion that faces the front lower side so as to protrude downward from the lower surface of the lower wall 97. Yes.
  • the contact portion 101 has a front end edge inclined at a larger inclination than the front end edge of the pressed portion 100 and is inclined rearward as it goes downward, and a lower end edge thereof is inclined upward as it goes rearward. is doing.
  • the top part of the contact part 101 is arranged behind the top part of the pressed part 100.
  • the front wall 98 is formed in a substantially flat plate shape extending continuously from the front end portion of the lower wall 97 and extending between the front end portions of the side walls 96.
  • the front wall 98 is provided with a development grip portion 102.
  • the developing grips 102 are provided one at each of the left and right ends of the front wall 98.
  • the development grip 102 is formed in a substantially rectangular flat plate shape that is continuous from the upper end of the front wall 98 and extends to the front upper side.
  • the upper wall 99 is formed in a substantially flat plate shape extending in the left-right direction, and is opposed to the upper ends of the side walls 96 and the front wall 98 from above.
  • the upper wall 99 is fixed to the upper end portions of the side walls 96 and the front wall 98 at the peripheral edge by a method such as welding.
  • the developing roller 34 is supported on the pair of side walls 96 of the developing frame 25. Specifically, the developing roller 34 is arranged such that each of both end portions in the left-right direction of the developing roller shaft 52 is disposed at the rear end portion of the corresponding side wall 96 (see FIG. 4B) and penetrates the side wall 96. By projecting outward in the left-right direction, the pair of side walls 96 are supported so as to be rotatable relative to each other.
  • a color member 54 as an example of a protruding portion formed so as to extend in parallel with the rotation axis of the developing roller shaft 52 is fitted on both ends of the developing roller shaft 52 protruding from the pair of side walls 96. ing. (2-2) Drive Unit
  • the drive unit 93 includes a gear train (not shown) and a gear holder 106.
  • the gear train includes a plurality of gears for rotationally driving the developing roller 34, the supply roller 33, and the agitator 29.
  • the gear train includes a developing coupling 108 to which a driving force is input from a main body side coupling (not shown) in the main body casing 2.
  • the developing coupling 108 transmits driving force to a plurality of gears.
  • the gear holder 106 is formed in a substantially box shape that opens to the right and rear, and is mounted on the left side wall 96 from the left side so as to cover the gear train in a lump.
  • a coupling exposed cylinder 109, a collar engaging groove 110, and a contact portion 111 are formed on the left side surface of the gear holder 106.
  • the coupling exposure cylinder 109 is formed in a substantially cylindrical shape that penetrates the gear holder 106 so as to expose the developing coupling 108 and protrudes to the left at the approximate center in the front-rear direction of the left side surface of the gear holder 106.
  • the collar engaging groove 110 is formed on the rear side of the coupling exposed cylinder 109, and is formed in a substantially C shape in a side view recessed from the rear end edge of the gear holder 106 toward the front lower side.
  • the abutting portion 111 is a rear upper side of the left side surface of the gear holder 106 and an upper side of the coupling exposed cylinder 109, has a substantially claw shape in a side view, and protrudes toward the left side.
  • a curved surface 112 is defined at the rear end portion of the abutting portion 111.
  • the curved surface 112 is partitioned into a substantially arc shape that is curved downward from the upper end surface toward the rear side at the rear end portion of the contact portion 111 (see FIG. 4A).
  • the curved surface 112 is also provided in a shape and arrangement that is symmetrical to the power supply unit (not shown) on the right side of the developing frame 25.
  • the gear holder 106 is mounted on the left side wall 96 from the left side so that the developing coupling 108 is inserted into the coupling exposed cylinder 109 and the collar member 54 is inserted into the collar engaging groove 110. It is fixed to the frame 25.
  • the developing coupling 108 is exposed through the coupling exposure cylinder 109, and the collar member 54 protrudes leftward from the collar engaging groove 110. 3.
  • the contact portion 101 of the developing cartridge 19 is connected to the drum cartridge 18. It abuts on the upper end of the contacted portion 66 from above.
  • the developing cartridge 19 is brought into contact with the bulging portion 74 of the pressing member 72 from the rear side at the front end edge of the pressed portion 100 and is brought into contact with the photosensitive drum 20 from the lower front side in the developing roller 34 ( Contact).
  • the developing cartridge 19 is pressed rearward and upward toward the photosensitive drum 20 by the urging force of the pressing member 72.
  • the color member 54 of the developing cartridge 19 is fitted in the guide groove 85 of the side wall 59 of the drum cartridge 18. That is, the rubber roller 53 of the developing roller 34 is pressed against the drum 44 of the photosensitive drum 20 from the front side by the color member 54 being guided toward the photosensitive drum 20 by the guide groove 85.
  • the rubber roller 53 is elastically deformed along the outer diameter of the drum 44 by pressure contact, and the rotation center of the photosensitive drum shaft 43 (referred to as the drum center 114) of the photosensitive drum 20 and the developing roller shaft 52 of the developing roller 34.
  • a nip portion 56 is formed at a pressure contact portion between the rubber roller 53 and the drum 44 on an imaginary line L1 passing through the rotation center (referred to as the roller center 115).
  • the locking portion 86 is disposed between the collar member 54 and the development coupling 108.
  • the distance from the nip portion 56 on the imaginary line L1 to the outer diameter of the rubber roller 53 before press contact is longer than the distance ⁇ .
  • the roller center 115 passes through the drum center 114 and is disposed below the virtual line L4 parallel to the virtual line L2.
  • the separation direction Y in which the developing cartridge 19 is detached from the drum cartridge 18 is a direction from the lower side to the upper side on the front side of the photosensitive drum 20. That is, the roller center 115 is disposed on the upstream side in the separation direction Y from the virtual line L4.
  • the guide surface 84 is continuous from the lower surface of the guide groove 85, extends along the direction away from the photosensitive drum 20, and is bent toward the downstream side in the separation direction Y of the developing cartridge 19.
  • the bulging portion 74 of the pressing member 72 presses the lower side of the front end edge of the pressed portion 100 of the developing cartridge 19 as the developing cartridge 19 rotates along the separation direction Y.
  • the developing cartridge 19 is pushed up by the urging force of the pressing member 72 and is further rotated along the detaching direction Y.
  • the color member 54 is moved forward along the lower surface of the guide groove 85, so that the developing roller 34 is separated from the photosensitive drum 20.
  • the state in which the rubber roller 53 and the drum 44 are pressed against each other is switched to the state in which the developing roller 34 and the photosensitive drum 20 are separated from each other.
  • the frictional force generated between the friction member 45 of the photosensitive drum 20 and the pair of side walls 59 is set smaller than the frictional force applied to the photosensitive drum 20 by the developing roller 34 when the developing cartridge 19 is detached. ing. Therefore, the photosensitive drum 20 is rotated (same as the rotation direction in the image forming operation, that is, clockwise when viewed from the left side) by the sliding of the developing roller 34. Further, with the rotation of the developing cartridge 19 in the detaching direction Y, the developing cartridge 34 rotates slightly even after the developing roller 34 and the photosensitive drum 20 are separated.
  • the nip portion 56 of the photosensitive drum 20 is moved from the front lower side along the rotation direction Z (clockwise in the left side view).
  • the developing cartridge 19 When the developing cartridge 19 is further pulled up along the separation direction Y, the developing cartridge 19 is separated from the inside of the guide groove 85 and guided upward along the guide surface 84, as shown in FIG. Then, the developing cartridge 19 is detached from the drum cartridge 18 upward.
  • the developing cartridge 19 and the drum cartridge 18 are operated in reverse to the above-described detachment operation.
  • the rear end portion of the developing cartridge 19 is inserted into the rear end portion of the cartridge mounting portion 81 of the drum cartridge 18 from above.
  • the collar member 54 moves rearward and downward along the guide surface 84, and the front end portion of the developing cartridge 19 is moved to the front lower side.
  • the collar member 54 is moved to the rear upper side along the guide groove 85 and inserted into the guide groove 85 as shown in FIG.
  • the front end portion of the developing cartridge 19 is accommodated in the front end portion of the cartridge mounting portion 81.
  • the guide groove 85 guides the color member 54 in order to allow the developing cartridge 19 to be attached to and detached from the drum cartridge 18.
  • the guide groove 85 (the lower surface 87 and the upper surface 88) has the drum center 114 of the photosensitive drum 20 and the roller center 115 of the developing roller 34. It is formed along a virtual line L1 that passes through and a crossing direction (virtual line L2) that intersects.
  • the distance ⁇ from the nip portion 56 to the outer diameter before pressure contact of the rubber roller 53 on the virtual line L3 that passes through the nip portion 56 and parallel to the virtual line L2 is equal to that before the pressure contact of the rubber roller 53 from the nip portion 56 on the virtual line L1.
  • the outer diameter is secured longer than the distance ⁇ .
  • the distance ⁇ is longer than the distance ⁇ , and therefore along the imaginary line L1. Compared with the case where the developing roller 34 is separated from the photosensitive drum 20, the contact distance between the rubber roller 53 and the drum 44 can be ensured longer.
  • the rubber roller 53 of the developing roller 34 does not immediately separate from the drum 44 of the photosensitive drum 20 but separates while sliding on the drum 44, so that the photosensitive drum 20 can be rotated.
  • the nip portion 56 is moved toward the downstream side in the rotation direction of the photosensitive drum 20, that is, along the rotation direction Z, as shown in FIGS. 5B and 6B.
  • the developing roller 34 is brought into contact with the photosensitive drum 20 at a position different from the nip portion 56 of the used developing cartridge 19 with the developing roller 34 in the photosensitive drum 20. Can do.
  • the developing cartridge 19 can be replaced without direct contact between the old toner and the new toner, and it is possible to suppress the occurrence of image formation defects.
  • the frictional force between the photosensitive drum 20 and the pair of side walls 59 generated by the friction member 45 causes the developing cartridge 19 to be detached from the drum cartridge 18.
  • the frictional force applied to the photosensitive drum 20 by the developing roller 34 is sometimes set to be smaller.
  • the photosensitive drum 20 can be reliably rotated.
  • the toner is pulverized toner, and therefore, the nip portion 56 between the photosensitive drum 20 and the developing roller 34.
  • the frictional force between the photosensitive drum 20 and the developing roller 34 can be improved by interposing the pulverized toner.
  • the developing roller 34 and the photosensitive drum 20 can be reliably rubbed, and the photosensitive drum 20 can be rotated more reliably.
  • the guide surface 84 that continues from the guide groove 85 and bends toward the downstream side in the detaching direction Y of the developing cartridge 19. Since it is provided, the developing cartridge 19 can be guided and can be securely attached and detached.
  • the developing roller 34 provided on the developing cartridge 19 is always pressed against the photosensitive drum 20 by the pressing member 72. is doing.
  • the rubber roller 53 of the developing roller 34 and the drum 44 of the photosensitive drum 20 can be reliably brought into contact with each other.
  • the developing roller 34 and the photosensitive drum 20 can be reliably rubbed.
  • the developing roller 34 passes through the drum center 114 of the photosensitive drum 20 and is closer to the virtual line L4 parallel to the virtual line L2. Since the developing cartridge 19 is disposed on the upstream side in the separation direction Y, the developing roller 34 and the photosensitive drum 20 can be rubbed more reliably when the developing cartridge 19 is detached from the drum cartridge 18. 7).
  • the process cartridge 15 described above is an embodiment of the present invention, and the present invention is not limited to the above-described embodiment.
  • the process cartridge 15 according to an embodiment of the present invention is mounted on the printer 1 as an example of an image forming apparatus.
  • the image forming apparatus can be configured as a color printer in addition to the above-described monochrome printer.
  • the image forming apparatus When the image forming apparatus is configured as a color printer, the image forming apparatus includes a direct tandem type color printer including a plurality of photosensitive drums and a recording medium conveying member, a plurality of photosensitive drums, an intermediate transfer member, and a transfer member. It can be configured as an intermediate transfer type tandem color printer.
  • the developing cartridge 19 can be configured such that a toner cartridge that contains toner is detachably attached to a frame having the developing roller 34.
  • a supply member such as a supply sleeve, a supply belt, or a brush-like roller can be applied.
  • a conveying member such as an auger screw or a conveying belt can be applied.
  • a contact type transfer member such as a transfer belt, a transfer brush, a transfer blade, or a film type transfer device, or a non-contact type transfer member such as a corotron type is used. It can also be applied.
  • a non-contact charger such as a corotron charger, a sawtooth discharge member, or a contact charger such as a charging roller may be applied. it can.
  • an exposure member such as an LED unit can be applied.
  • the image forming apparatus can also be configured as a multi-function machine equipped with an image reading unit and the like.
  • the color member 54 is externally fitted to both end portions of the developing roller shaft 52. However, the both end portions of the developing roller shaft 52 are not provided at both end portions of the developing roller shaft 52.
  • the guide surface 84 and the guide groove 85 may be guided.
  • a protruding portion such as a boss is separately protruded from both ends of the developing roller shaft 52 and the pair of side walls 96 of the developing frame 25 instead of the collar member 54, and the protruding portion is guided.
  • the surface 84 and the guide groove 85 may be guided.

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  • Engineering & Computer Science (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electrophotography Configuration And Component (AREA)

Abstract

L'invention concerne une cartouche de traitement qui permet de remplacer une cartouche de révélateur sans que le révélateur usagé vienne en contact direct avec le nouveau révélateur. Par rapport à la cartouche de traitement (15), l'élément de couleur (54) pour une cartouche de révélateur (19) comprenant un rouleau de développement (34) est fixé et retiré par guidage dans la rainure de guidage (85) d'une cartouche à tambour (18) comprenant un tambour photosensible (20). La rainure de guidage (85) est formée le long d'une direction d'intersection qui coupe une ligne virtuelle (L1) reliant le centre (114) du tambour photosensible (20) et le centre (115) du rouleau de développement (34) lorsque ledit rouleau de développement est en contact avec le tambour photosensible (20) à l'état fixé.
PCT/JP2012/080835 2012-07-09 2012-11-29 Cartouche de traitement WO2014010123A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201290001280.2U CN204807921U (zh) 2012-07-09 2012-11-29 处理盒

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2012-154144 2012-07-09
JP2012154144A JP2014016492A (ja) 2012-07-09 2012-07-09 プロセスカートリッジ

Publications (1)

Publication Number Publication Date
WO2014010123A1 true WO2014010123A1 (fr) 2014-01-16

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ID=49915613

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2012/080835 WO2014010123A1 (fr) 2012-07-09 2012-11-29 Cartouche de traitement

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JP (1) JP2014016492A (fr)
CN (1) CN204807921U (fr)
WO (1) WO2014010123A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9377751B2 (en) * 2014-03-31 2016-06-28 Brother Kogyo Kabushiki Kaisha Image forming apparatus having developer cartridge rotatable between first and second positions
JP7094163B2 (ja) * 2018-06-25 2022-07-01 シャープ株式会社 プロセスカートリッジおよびそれを備える画像形成装置

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000250310A (ja) * 1999-02-26 2000-09-14 Brother Ind Ltd 画像形成装置、感光体カートリッジ及び現像カートリッジ
JP2003270945A (ja) * 2002-03-13 2003-09-25 Brother Ind Ltd 現像装置の再使用方法、現像装置および画像形成装置
JP2007316631A (ja) * 2006-04-28 2007-12-06 Brother Ind Ltd 感光体ユニットおよび画像形成装置
JP2008185737A (ja) * 2007-01-29 2008-08-14 Brother Ind Ltd 画像形成装置、現像カートリッジ、感光体カートリッジおよびプロセスカートリッジ
JP2009181029A (ja) * 2008-01-31 2009-08-13 Brother Ind Ltd 現像カートリッジ
JP2012118176A (ja) * 2010-11-30 2012-06-21 Brother Ind Ltd プロセスカートリッジ

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000250310A (ja) * 1999-02-26 2000-09-14 Brother Ind Ltd 画像形成装置、感光体カートリッジ及び現像カートリッジ
JP2003270945A (ja) * 2002-03-13 2003-09-25 Brother Ind Ltd 現像装置の再使用方法、現像装置および画像形成装置
JP2007316631A (ja) * 2006-04-28 2007-12-06 Brother Ind Ltd 感光体ユニットおよび画像形成装置
JP2008185737A (ja) * 2007-01-29 2008-08-14 Brother Ind Ltd 画像形成装置、現像カートリッジ、感光体カートリッジおよびプロセスカートリッジ
JP2009181029A (ja) * 2008-01-31 2009-08-13 Brother Ind Ltd 現像カートリッジ
JP2012118176A (ja) * 2010-11-30 2012-06-21 Brother Ind Ltd プロセスカートリッジ

Also Published As

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CN204807921U (zh) 2015-11-25
JP2014016492A (ja) 2014-01-30

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