WO2014010132A1 - Cartouche de traitement et dispositif formant image - Google Patents

Cartouche de traitement et dispositif formant image Download PDF

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Publication number
WO2014010132A1
WO2014010132A1 PCT/JP2012/080844 JP2012080844W WO2014010132A1 WO 2014010132 A1 WO2014010132 A1 WO 2014010132A1 JP 2012080844 W JP2012080844 W JP 2012080844W WO 2014010132 A1 WO2014010132 A1 WO 2014010132A1
Authority
WO
WIPO (PCT)
Prior art keywords
cartridge
developing
housing
drum
developer
Prior art date
Application number
PCT/JP2012/080844
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 CN201290001276.6U priority Critical patent/CN204479914U/zh
Publication of WO2014010132A1 publication Critical patent/WO2014010132A1/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
    • G03G21/1839—Means for handling the process cartridge in the apparatus body
    • G03G21/1842—Means for handling the process cartridge in the apparatus body for guiding and mounting the process cartridge, positioning, alignment, locks
    • G03G21/1846—Means for handling the process cartridge in the apparatus body for guiding and mounting the process cartridge, positioning, alignment, locks using a handle for carrying or pulling out of the main machine, legs of casings
    • 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 an image forming apparatus such as a laser printer, and a process cartridge provided therein.
  • a printer that is detachably provided with a cartridge that contains toner is known.
  • a process cartridge comprising a drum cartridge that holds a photosensitive drum and a developing cartridge that holds a developing roller facing the photosensitive drum and is detachably provided on the drum cartridge is proposed.
  • a drum cartridge that holds a photosensitive drum
  • a developing cartridge that holds a developing roller facing the photosensitive drum and is detachably provided on the drum cartridge is proposed.
  • the developing roller support portion facing the developing roller from below is formed so as to extend to the lower side of the photosensitive drum, thereby suppressing toner leakage from the process cartridge.
  • the drum cartridge is provided with a grip portion extending in the horizontal direction on the opposite side of the photosensitive drum with respect to the developing cartridge.
  • the developing cartridge is mounted on the drum cartridge obliquely from the grip portion side toward the photosensitive drum side.
  • an object of the present invention is to provide a process cartridge capable of suppressing the leakage of the developer while having a grip portion that is easy for a user to grip, and an image forming apparatus including the process cartridge.
  • a process cartridge includes a developing cartridge including a developer accommodating portion and a developer carrying member, and a photosensitive cartridge to which the developing cartridge can be attached and detached.
  • the cartridge includes a housing and a photoconductor that is provided in the housing and is configured to rotate about an axis.
  • the housing is adjacent to the photoconductor housing portion that houses the photoconductor, and the photoconductor housing portion.
  • a cartridge accommodating portion for accommodating the developing cartridge, and the cartridge accommodating portion has a first wall and a second wall that form a space for accommodating the developing cartridge, and the first wall extends in an adjacent direction, An opposing portion facing the developing cartridge; and an extension extending toward the photosensitive member for guiding the recording medium toward the photosensitive member; the second wall has a gripping portion; From the end opposite to the photosensitive member housing section, projecting in opposite directions the developing cartridge in a direction crossing the adjacent direction, extensions are extended in the photosensitive member housing section side in the adjacent direction of the developing cartridge.
  • the grip portion is provided on the second wall of the photosensitive member cartridge so as to protrude in the opposite direction from the developing cartridge, access to the grip portion can be facilitated.
  • the extension portion is provided on the first wall of the photoconductor cartridge together with the facing portion so that the extension portion is extended to the photoconductor storage portion side of the development cartridge, the developer stored in the development cartridge is Leakage from the first wall side in the facing direction can be suppressed.
  • the extension portion may extend so as to bend toward the photosensitive member side from the end portion on the photosensitive member housing portion side in the adjacent direction of the facing portion.
  • the extension portion is bent toward the photosensitive member side, the developer stored in the developing cartridge is prevented from leaking from the photosensitive member storing portion side of the photosensitive cartridge in the process cartridge. be able to.
  • the extension portion may include a protruding portion that protrudes toward the developer carrying member continuously from the end portion on the side of the photosensitive member housing portion in the adjacent direction.
  • the projecting portion is formed so as to be folded back from the end portion of the extension portion on the photosensitive member housing portion side toward the developer carrying member side, the developer accommodated in the developer cartridge Can be reliably suppressed from leaking from the process cartridge.
  • the housing further includes a transfer member support portion that supports a transfer member for transferring the developer image carried on the photosensitive member to the recording medium, and the photosensitive member in the direction adjacent to the transfer member support portion and the extension portion.
  • An opening for guiding the recording medium may be formed between the transfer member and the photoconductor with the end on the side of the body accommodating portion.
  • an opening for guiding the recording medium can be formed between the transfer member and the photosensitive member by using the extension that can suppress the leakage of the developer.
  • the number of parts can be reduced and the process cartridge can be reduced in size as compared with the case where the opening is formed using another member with a simple configuration.
  • the developing cartridge is configured to be attached and detached while being rotated with respect to the cartridge housing portion.
  • the cartridge housing portion has a third wall facing the mounted developing cartridge from the outside in the axial direction.
  • the third wall includes a guide portion for guiding the rotation of the developer cartridge, and the developer cartridge includes a guided portion guided by the guide portion at an end portion in the axial direction of the developer carrier.
  • the guide portion may include a locking portion that is locked in a direction opposite to the guided portion when the developing cartridge is mounted.
  • the developing cartridge can be attached to and detached from the cartridge housing portion while rotating.
  • the developing cartridge can be smoothly attached and detached.
  • the extension portion for covering the developing cartridge 19 is provided on the photosensitive cartridge, leakage of the developer can be suppressed without increasing the size of the process cartridge.
  • An image forming apparatus of the present invention includes the process cartridge described above.
  • the image forming apparatus includes the process cartridge that can suppress leakage of the developer accommodated in the developing cartridge while including the grip portion that can be easily gripped by the user.
  • the image forming apparatus of the present invention has a transport path for transporting the recording medium, and the transport path is in a substantially vertical direction so that the recording medium passes between the photosensitive member and the transfer member.
  • the extension may be formed so as to approach the transport path as it goes downstream in the transport direction of the recording medium.
  • the extension portion is formed so as to approach the conveyance path as it goes downstream in the conveyance direction of the recording medium, the developer dropped by the image forming operation can be removed from the extension portion. It can be made to flow away from a conveyance course towards.
  • the end of the extension portion adjacent to the photosensitive member housing portion side is more than the roller for transporting the recording medium provided on the upstream side in the transport direction of the recording medium. It may be arranged on the transfer member side.
  • the extension portion is disposed so as to cover the developing cartridge when viewed from the upstream side in the transport direction.
  • the transfer member support portion may be formed downstream of the extension portion in the conveyance direction of the recording medium.
  • the recording medium can be reliably guided toward the transfer member support portion by the extension portion.
  • the process cartridge and the image forming apparatus of the present invention it is possible to prevent the developer from leaking from the first wall side of the photosensitive cartridge, while having a grip portion that is easy for the user to grip.
  • FIG. 1 is a side sectional view of a printer according to an embodiment of the present invention.
  • FIG. 2 is a cross-sectional view of the process cartridge shown in FIG.
  • FIG. 3 is a perspective view of the drum cartridge shown in FIG. 2 as viewed from the upper left.
  • FIG. 4 is a perspective view of the drum cartridge shown in FIG. 2 as viewed from the lower left.
  • FIG. 5 is an explanatory view for explaining attachment and detachment of the developing cartridge shown in FIG. 2 with respect to the drum cartridge, and is a left side view showing a state where the developing cartridge is completely attached to the drum cartridge.
  • FIG. 6 is an explanatory diagram for explaining attachment / detachment of the developing cartridge to / from the drum cartridge following FIG.
  • FIG. 5 is a left side view showing a state in the middle of attachment / detachment of the developing cartridge to / from the drum cartridge.
  • FIG. 7 is an explanatory diagram for explaining attachment / detachment of the developing cartridge to / from the drum cartridge following FIG. 6, and is a left side view showing a state in which the developing cartridge is detached from the drum cartridge.
  • a printer 1 as an example of an image forming apparatus according to an embodiment of the present invention includes a substantially box-shaped main body casing 2.
  • the printer 1 includes a sheet feeding unit 3 for feeding a sheet S as an example of a recording medium and an image forming unit 4 for forming an image on the fed sheet S in the main body casing 2. It has.
  • the up / down / front / rear direction in FIG. 1 related to the printer 1 is slightly different from the up / down / front / rear direction in FIG. 2 to FIG. 7 related to the process cartridge 15 (described later).
  • the printer 1 is mounted on the printer 1 such that the rear side and the rear side are the rear lower side of the printer 1.
  • 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.
  • 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 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 paper S is placed in a state where the paper feed cover 8 is placed at the second position and the paper opening 6 is opened. More specifically, the sheets S are arranged such that the front side portion thereof is stacked on the upper surface of the paper feed cover 8 and the rear side portion thereof is stacked in the paper placement portion 9 through the paper opening 6.
  • 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.
  • the image forming unit 4 includes a process cartridge 15, a scanner unit 16, and a fixing unit 17.
  • the process cartridge 15 is configured to be detachable with respect to the main body casing 2, and is disposed on the upper side of the rear side portion of the paper feeding unit 3 when mounted on the main body casing 2.
  • 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 as an example of a photosensitive member, a transfer roller 21 as an example of a transfer member, and a scorotron charger 22.
  • the photosensitive drum 20 is formed in a cylindrical shape elongated in the left-right direction, and includes a drum shaft 42 extending in the left-right direction.
  • the photosensitive drum 20 is rotatably provided at the rear portion of the drum cartridge 18.
  • the transfer roller 21 is formed in a substantially cylindrical shape extending in the left-right direction, and is provided in the rear portion of the drum cartridge 18 so as to be 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 accommodating chamber 26 and a developing chamber 27 as an example of a developer accommodating portion 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 (developer), and an agitator 29 is provided at a substantially central portion in the front-rear and vertical 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.
  • a pair of side seals 45 are provided on both outer sides in the left-right direction of the developing chamber 27 (see FIG. 2).
  • the side seal 45 is formed in a substantially C shape in side view along the peripheral surface of the developing roller 34 (described later) and opened upward.
  • a supply roller 33, a developing roller 34 as an example of a developer carrier, a layer thickness regulating blade 35, and a lower film 36 are provided.
  • the supply roller 33 is formed in a substantially cylindrical shape extending in the left-right direction, and is rotatably provided in the front portion of the developing chamber 27 so that the lower portion thereof is disposed in the supply roller groove 30.
  • 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 (slightly above the toner storage chamber 26).
  • the developing roller 34 includes a metal developing roller shaft 43 extending in the left-right direction and a rubber roller 44 that covers the developing roller shaft 43 so that both left and right ends of the developing roller shaft 43 are exposed.
  • the developing roller 34 has a substantially central peripheral surface in the left-right direction in the lower portion of the rubber roller 44 and the developing roller facing surface 31 facing each other with a space therebetween, and a peripheral surface at both ends in the left-right direction in the lower portion of the rubber roller 44.
  • the upper surface of the side seal 45 is disposed in contact with the upper surface of the side seal 45, and is provided rotatably at the rear portion of the developing chamber 27. That is, the side seal 45 is disposed so as to be recessed downward so that the toner carried on the developing roller 34 does not leak from the rear side when the process cartridge 15 is mounted on the printer 1.
  • the rubber roller 44 of the developing roller 34 is provided so as to come into contact with the supply roller 33 from the rear upper side, and its upper and rear portions are exposed from the developing chamber 27, and from the front lower side with respect to the photosensitive drum 20. In contact. 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 arranged with a space in the circumferential direction of the photosensitive drum 20 with respect to the scorotron charger 22, and a virtual line segment (which connects the axial center of the photosensitive drum 20 and the charging wire 23 ( (Not shown) and an imaginary line segment (not shown) connecting the axis center of the photosensitive drum 20 and the axis center of the developing roller 34 are arranged so that an angle of about 120 ° is formed. . 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 lower 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.
  • 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 nip point where the photosensitive drum 20 and the transfer roller 21 are in contact with the axial center of the photosensitive drum 20. Is set to
  • 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.
  • various rollers (the transfer roller 21, the supply roller 33, and the developing roller 34) provided in the process cartridge 15 also pass the emission locus of the laser beam L from the lower side to the upper side.
  • 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.
  • 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 a paper discharge tray 41 formed on the upper surface of the main casing 2 by the paper discharge roller 40.
  • the paper S is fed from the paper placement unit 9 and passes between the photosensitive drum 20 and the transfer roller 21 (nip point) so as to go from the lower side to the upper side along the substantially vertical direction.
  • the paper After passing between the heating roller 38 and the pressure roller 39, the paper is conveyed through a substantially C-shaped conveyance path (conveyance path) in a side view so as to be discharged onto the discharge tray 41.
  • the process cartridge 15 includes a drum cartridge 18 that is detachably attached to the main body casing 2 (see FIG. 1), and a developing cartridge 19 that is detachably attached to the drum cartridge 18. ing.
  • Drum Cartridge The drum cartridge 18 includes a drum frame 52 as shown in FIG.
  • the drum frame 52 is formed in a substantially bottomed rectangular frame shape, and a rear portion thereof is formed as a drum housing portion 53 as an example of a photoreceptor housing portion, and a front portion thereof is an example of a cartridge housing portion.
  • the cartridge mounting portion 54 is formed. That is, the drum housing portion 53 is disposed on the rear side of the cartridge mounting portion 54 so as to be adjacent to the cartridge mounting portion 54 in the front-rear direction.
  • the drum housing part 53 is formed in a substantially box shape whose front side is opened (see FIG. 2), and a pair of housing part side walls 55 arranged to face each other with a gap in the left-right direction.
  • the transfer roller support portion 56 (see FIG. 2) for connecting the rear portions of the lower end portions of the accommodating portion side walls 55 and the upper wall 57 for connecting the upper end portions of the accommodating portion side walls 55 are provided.
  • Each of the pair of accommodating portion side walls 55 is formed in a substantially flat plate shape having a substantially rectangular shape in a side view extending in the vertical direction.
  • Each guide portion side wall 55 is provided with a guide portion 58 at a lower portion of the front end portion thereof.
  • a guide groove 59 is formed in the guide portion 58, and a locking portion 60 is provided.
  • the guide groove 59 is recessed from the front end edge of the accommodating portion side wall 55 toward the rear, and is formed in a substantially U shape in a side view in which the front side is opened.
  • the groove width (vertical length) of the guide groove 59 is formed to be substantially the same length (slightly longer) as the outer diameter of the collar 47 (described later) of the developing cartridge 19.
  • the locking portion 60 is formed in a substantially rectangular shape in a side view protruding from the front end portion of the housing portion side wall 55 toward the rear upper side above the guide groove 59. That is, the locking part 60 is formed along a direction intersecting with a direction along the upper edge of the mounting part side wall 70 (described later). The locking portion 60 is provided such that the lower end edge thereof is continuous with the upper end edge of the guide groove 59.
  • the photosensitive drum 20 and the transfer roller 21 are supported between the pair of accommodating portion side walls 55.
  • Each of the left and right end portions of the drum shaft 42 is disposed at a substantially central portion in a side view of the corresponding accommodating portion side wall 55 and protrudes outward in the left and right direction so as to penetrate the accommodating portion side wall 55. (Refer to FIG. 3), the pair of accommodating portion side walls 55 are supported so as to be rotatable relative to each other.
  • the left and right ends of the transfer roller 21 are disposed at the lower rear portion of the accommodating portion side wall 55, and are supported so as to be rotatable relative to the pair of accommodating portion side walls 55.
  • the horizontal length of the transfer roller 21 is shorter than the horizontal length of the photosensitive drum 20. Therefore, the rear lower portion of the accommodating portion side wall 55 is formed so as to shorten the left and right intervals in order to support the transfer roller 21. That is, the accommodating portion side wall 55 is formed in a substantially crank shape in a plan view with its rear end portion facing inward.
  • the transfer roller support part 56 is formed in a substantially U shape in a side sectional view that bulges toward the rear lower side along the peripheral surface of the transfer roller 21.
  • transfer roller support part 56 has a lip part 63 integrally therewith.
  • the lip portion 63 is formed in a substantially flat plate shape that is continuous from the front end portion of the transfer roller support portion 56 and extends downward.
  • a plurality of (four in this embodiment) concave portions 64 are formed in the lip portion 63.
  • the concave portions 64 are arranged at intervals in the left-right direction, and the lower end portion of the lip portion 63 is opened, and is formed in a substantially U shape in plan view that is recessed upward.
  • the upper wall 57 is formed in a substantially flat plate shape extending in the left-right direction, as shown in FIG. Further, as shown in FIG. 2, the scorotron charger 22 is embedded in the upper wall 57. The lower end portion of the grid 24 of the scorotron charger 22 is exposed from the lower surface of the upper wall 57.
  • the upper wall 57 is provided so as to cover the photosensitive drum 20 from above, and the lower end portion of the grid 24 faces the upper portion of the photosensitive drum 20.
  • a discharge opening 67 for discharging the sheet S having an opening area between the upper wall 57 and the upper end of the transfer roller support 56 passing through the nip point between the photosensitive drum 20 and the transfer roller 21. (See FIG. 2).
  • the cartridge mounting portion 54 is formed in a substantially box shape with the upper and rear sides opened so as to allow the mounting and dismounting of the developing cartridge 19, and is spaced in the horizontal direction.
  • a pair of mounting portion side walls 70 disposed opposite to each other, a mounting portion bottom wall 71 as an example of a first wall connecting the lower ends of the pair of mounting portion side walls 70, and a pair of mounting portion side walls 70.
  • a front wall 72 as an example of a second wall that connects the front end portions.
  • Each of the pair of mounting portion side walls 70 is formed in a substantially flat plate shape that extends from the lower end portion of the front end portion of the housing portion side wall 55 obliquely upward as it goes forward. Further, the upper end edge of the mounting portion side wall 70 is formed to be continuous with the lower end edge of the guide groove 59 and to extend obliquely upward as it goes forward.
  • the front end edge of the accommodating part side wall 55, the locking part 60, the guide groove 59 and the upper end edge of the mounting part side wall 70 constitute a guide part 58, and the mounting part side wall 70 and the accommodating part side wall 55 have a guide part 58. It is comprised as an example of the 3rd wall.
  • a lock lever 74 that restricts the separation of the developing cartridge 19 from the drum cartridge 18 is provided on the right-side mounting portion side wall 70.
  • the mounting portion bottom wall 71 is disposed on the front side of the lip portion 63 with a space therebetween.
  • the mounting portion bottom wall 71 is integrally provided with a facing portion 78, an extension portion 79, and a bulging portion 81.
  • the facing portion 78 is formed in a substantially flat plate shape that connects from the front end portion between the lower end portions of the pair of mounting portion side walls 70 to the front of the rear end portion on which the extension portion 79 is installed, and extends in the front-rear direction.
  • the extension portion 79 connects the rear end portions between the lower end portions of the pair of mounting portion side walls 70, extends rearward from the rear end portion (on the drum accommodating portion 53 side) of the facing portion 78, and slightly above (the photosensitive drum 20). It is formed in a substantially flat plate shape that bends toward the side.
  • the bulging portion 81 is formed so as to bulge toward the front upper side in the continuous portion of the facing portion 78 and the extending portion 79.
  • the extension 79 includes a protrusion 80 that protrudes continuously from the rear edge toward the front upper side, and a plurality (four in this embodiment) that protrude from the rear edge toward the photosensitive drum 20.
  • a convex portion 82 (see FIG. 4) is provided.
  • the protruding portion 80 is formed in a substantially flat plate shape extending in the left-right direction (see FIG. 3), and from the rear end edge (on the drum accommodating portion 53 side) of the extending portion 79 in a state where the developing cartridge 19 is mounted on the drum cartridge 18. It is formed so as to continuously protrude toward the developing roller 34.
  • the convex portions 82 are arranged at intervals in the left-right direction so as to continuously protrude toward the photosensitive drum 20 from the rear end edge of the extension portion 79.
  • the four convex portions 82 are formed at positions facing the four concave portions 64 when projected in the front-rear direction.
  • An opening area between the front end portion of the transfer roller support portion 56 and the rear end portion (on the drum accommodating portion 53 side) of the mounting portion bottom wall 71 is the sheet S at the nip point between the photosensitive drum 20 and the transfer roller 21.
  • the front wall 72 is formed so as to be inclined obliquely upward continuously from the front end portion of the mounting portion bottom wall 71 toward the front.
  • the front wall 72 is provided with a plurality of (two in this embodiment) pressing members 83 spaced apart in the left-right direction on the rear surface.
  • the pressing member 83 is provided so as to press the developing cartridge 19 toward the photosensitive drum 20 in a state where the developing cartridge 19 is mounted on the drum cartridge 18.
  • an extending portion 86 is provided on the front wall 72.
  • the extending portion 86 is formed in a substantially flat plate shape extending in the left-right direction (longitudinal direction), and is formed so as to extend forward from the substantially central portion in the left-right direction at the upper end portion of the front wall 72 toward the upper side. (See FIG. 2).
  • the extending portion 86 is integrally provided with a drum gripping portion 87 as an example of a gripping portion.
  • the drum gripping portion 87 is provided so as to extend in the left-right direction at a substantially central portion in the left-right direction on the rear surface of the extending portion 86.
  • the drum gripping portion 87 is formed to bulge backward as it goes upward.
  • the developing cartridge 19 is arranged on the right side of the developing frame 25 and is provided on the left side of the developing frame 25 as shown in FIG.
  • a gear train (not shown) to which a driving force is input from the printer 1 and a gear cover 48 that covers the gear train (not shown) are provided.
  • the gear cover 48 is formed in a substantially box shape that opens to the right and rear.
  • a contact portion 49 is provided on the gear cover 48.
  • the contact portion 49 is formed in a substantially claw shape in a side view extending in the front upper direction and the rear lower direction, and is formed in a substantially columnar shape protruding leftward from the left upper surface of the gear cover 48.
  • a curved guide surface 50 is defined at the rear end of the contact portion 49.
  • the guide curved surface 50 is partitioned at the rear end portion of the abutting portion 49 into a substantially arc shape that curves downward from the upper side surface toward the rear side.
  • the curved guide surface 50 is also provided in a symmetrical shape and arrangement in a power supply unit (not shown) on the right side of the developing frame 25.
  • a collar 47 as an example of a substantially cylindrical guided portion is fitted on both ends of the developing roller shaft 43.
  • the gear cover 48 is fixed to the left side wall of the developing frame 25 so as to cover a gear train (not shown) and to expose the collar 47 to the left side of the developing cartridge 19 from its rear end. .
  • a developing grip 51 is provided on the developing frame 25 of the developing cartridge 19.
  • the development gripping portion 51 is formed in a substantially flat plate shape having a substantially rectangular shape when viewed from the front, and is provided at both ends in the left-right direction on the front surface of the development frame 25.
  • the developing grip 51 is formed so as to extend obliquely upward as it continues forward from the upper end of the front surface of the developing frame 25.
  • the developing cartridge 19 is rotated in the mounting direction X (substantially clockwise as viewed from the left side) with the contact portion between the curved guide surface 50 and the accommodating portion side wall 55 as a fulcrum. Then, as shown in FIG. 6, the collar 47 moves rearward and downward along the upper edge of the mounting portion side wall 70, and the front end portion of the developing cartridge 19 is moved to the front lower side.
  • the collar 47 is inserted into the guide groove 59 of the guide portion 58 and the front end portion of the developing cartridge 19 is moved as shown in FIG. It is accommodated in the front end portion of the cartridge mounting portion 54.
  • the guide portion 58 guides the rotation of the developing cartridge 19.
  • the locking portion 60 of the guide portion 58 faces the upper side of the collar 47 and locks the collar 47 in the vertical direction.
  • the pressing member 83 of the front wall 72 of the cartridge mounting portion 54 presses the developing cartridge 19 from the front side, the rubber roller 44 of the developing roller 34 and the photosensitive drum 20 are always pressed against each other.
  • the mounting portion bottom wall 71 is disposed such that the facing portion 78 faces the developing cartridge 19 in the vertical direction, and the extension portion 79 is behind the developing cartridge 19 (drum housing portion). 53 side) and is formed so as to approach the photosensitive drum 20.
  • the mounting portion side wall 70 is disposed so as to face the developing cartridge 19 from the outside in the left-right direction.
  • drum gripping portion 87 of the drum cartridge 18 protrudes from the developing gripping portion 51 of the developing cartridge 19 toward the front upper side (direction intersecting the direction in which the drum housing portion 53 and the cartridge mounting portion 54 are adjacent to each other). Yes.
  • lock lever 74 always regulates the separation of the developing cartridge 19 from the drum cartridge 18.
  • the developing cartridge 19 is rotated in the detaching direction Y (counterclockwise in the left side view) with the contact portion between the guide curved surface 50 and the accommodating portion side wall 55 as a fulcrum.
  • the collar 47 is detached from the guide groove 59 and is disposed on the front upper side of the locking portion 60, and is positioned above the continuous portion of the accommodating portion side wall 55 and the mounting portion side wall 70.
  • the developing cartridge 19 is further lifted toward the rear upper side along the separating direction Y, and the developing cartridge 19 is detached from the drum cartridge 18 upward.
  • the separation of the developing cartridge 19 from the cartridge mounting portion 54 is completed. That is, the developing cartridge 19 is attached to and detached from the cartridge mounting portion 54 of the drum cartridge 18 while being rotated.
  • the end on the rear side (drum housing 53 side) of the extension 79 is from rollers (pickup roller 11 and paper feed roller 12) for transporting the paper S provided on the upstream side in the transport direction of the paper S.
  • the extension 79 is disposed on the transfer roller 21 side, and is formed so as to approach the transport path as it goes downstream in the transport direction of the paper S.
  • the transfer roller support portion 56 is disposed on the downstream side of the extension portion 79 in the transport direction of the paper S.
  • extension portion 79 is provided on the mounting portion bottom wall 71 of the drum cartridge 18 so as to extend rearward (on the drum housing portion 53 side) from the mounted developing cartridge 19, The stored toner can be prevented from leaking from below (the mounting portion bottom wall 71 side).
  • the toner can be prevented from leaking from below the process cartridge 15 (on the bottom wall 71 side of the mounting portion of the drum cartridge 18) while including the drum gripping portion 87 that is easy for the user to grip.
  • the projecting portion 80 is directed from the rear end portion (end portion on the drum accommodating portion 53 side) of the extension portion 79 toward the developing roller 34 side. Therefore, the toner accommodated in the developing cartridge 19 can be reliably prevented from leaking from the process cartridge 15.
  • the bulging portion 81 is formed so as to bulge from the continuous portion of the facing portion 78 and the extension portion 79 toward the front upper side, the toner accommodated in the developing cartridge 19 leaks from the process cartridge 15. This can be suppressed more reliably.
  • the transfer roller 21 and the photosensitive member are exposed by using the extension 79 that can suppress the leakage of toner and the transfer roller support 56.
  • a paper feed opening 84 for guiding the paper S can be formed between the drum 20 and the drum 20.
  • the number of parts can be reduced and the process cartridge 15 can be reduced in size as compared with the case where the paper feed opening 84 is formed using another member, although the configuration is simple.
  • the developing cartridge 19 can be attached to and detached from the cartridge mounting portion 54 while being rotated.
  • the developing cartridge 19 can be attached and detached.
  • the developing cartridge 19 becomes large.
  • drum cartridge 18 is provided with the extension 79 that covers the developing cartridge 19 from below, leakage of the toner can be suppressed without increasing the size of the process cartridge 15.
  • the printer 1 includes a drum grip 87 that can be easily gripped by the user, and suppresses leakage of toner stored in the developing cartridge 19.
  • a process cartridge 15 is provided.
  • the extension 79 is formed so as to approach the transport path toward the downstream side in the transport direction of the paper S. Therefore, the image forming operation is performed.
  • the toner that has fallen by the above can flow from the extension portion 79 toward the facing portion 78, that is, in a direction away from the conveyance path.
  • the toner can be prevented from entering the transport path and adhering to the paper S.
  • the extension 79 is disposed so as to cover the developing cartridge 19 when viewed from the upstream side in the transport direction.
  • the extension portion 79 can reliably guide the paper S toward the transfer roller support portion 56 (downstream in the transport direction).
  • the toner contained in the developing cartridge 19 can be prevented from adhering to the paper S while the paper S can be guided toward the transfer roller support 56 by the extension portion 79.
  • printer 1 described above is an embodiment of the image forming apparatus of the present invention, and the present invention is not limited to the above-described embodiment.
  • the image forming apparatus of the present invention 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 members and a recording medium conveying member, a plurality of photosensitive members, an intermediate transfer member, and a transfer member. It can be configured as an intermediate transfer type tandem color printer.
  • a photosensitive member such as a photosensitive belt can be applied.
  • a developer carrier such as a developing sleeve, a developing belt, or a brush-like roller can be applied.
  • 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 extension 79 is formed integrally with the drum frame 52 of the drum cartridge 18, but may be assembled as a separate member. For example, a film-like member is attached to the rear end of the facing portion 78. In addition, the extension 79 may be used.
  • the drum gripping portion 87 described above is integrally formed with the drum frame 52 of the drum cartridge 18, but can be assembled as a separate member.
  • the image forming apparatus of the present invention can also be configured as a multi-function machine equipped with an image reading unit and the like.

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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

La présente invention porte sur : une cartouche de traitement qui permet de rendre minimale une fuite de développeur et qui comprend une section de saisie qui est facile à saisir pour un utilisateur ; et un dispositif formant image comportant la cartouche de traitement. En ce qui concerne la cartouche de traitement (15), une cartouche de tambour (18) comporte une section de montage de cartouche (54) qui reçoit une cartouche de développeur (19) de telle sorte que ladite cartouche de développeur est détachable. La section de montage de cartouche (54) comprend : une paroi inférieure de section de montage (71) ayant une section faisant face (78) qui est tournée vers la cartouche de développeur montée (19) et une section prolongée (79) qui se prolonge vers un tambour photosensible (20) ; et une paroi avant (72) qui a une section de saisie de tambour (87) et qui fait saillie plus loin vers le haut que la cartouche de développeur montée (19).
PCT/JP2012/080844 2012-07-09 2012-11-29 Cartouche de traitement et dispositif formant image WO2014010132A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201290001276.6U CN204479914U (zh) 2012-07-09 2012-11-29 处理盒及图像形成装置

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2012-154153 2012-07-09
JP2012154153A JP2014016501A (ja) 2012-07-09 2012-07-09 プロセスカートリッジおよび画像形成装置

Publications (1)

Publication Number Publication Date
WO2014010132A1 true WO2014010132A1 (fr) 2014-01-16

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PCT/JP2012/080844 WO2014010132A1 (fr) 2012-07-09 2012-11-29 Cartouche de traitement et dispositif formant image

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JP (1) JP2014016501A (fr)
CN (1) CN204479914U (fr)
WO (1) WO2014010132A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005258024A (ja) * 2004-03-11 2005-09-22 Canon Inc プロセスカートリッジ及び画像形成装置
JP2011013368A (ja) * 2009-06-30 2011-01-20 Brother Industries Ltd 現像剤カートリッジおよび現像装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005258024A (ja) * 2004-03-11 2005-09-22 Canon Inc プロセスカートリッジ及び画像形成装置
JP2011013368A (ja) * 2009-06-30 2011-01-20 Brother Industries Ltd 現像剤カートリッジおよび現像装置

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CN204479914U (zh) 2015-07-15
JP2014016501A (ja) 2014-01-30

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