Field of the Invention
The present invention relates to an electrophotographic image forming apparatus (hereinafter, image forming apparatus), a cartridge attachable to and detachable from an apparatus main body of the image forming apparatus, and a member used for the cartridge.
In this case, the image forming apparatus forms an image on a recording medium by using an electrophotographic image forming process. Examples of the image forming apparatus include, for example, an electrophotographic copier, an electrophotographic printer (for example, laser beam printer, LED printer, etc.), a facsimile device, and a word processor.
Also, the cartridge may be a configuration including an electrophotographic photosensitive drum (hereinafter, photosensitive drum) being an image carrying member, or a process unit acting on the photosensitive drum (for example, developer carrying member (hereinafter, developing roller)) in a cartridge form, and is attachable to and detachable from the image forming apparatus. The cartridge may be a configuration in a cartridge form including the photosensitive drum and the developing roller in an integrated manner or a configuration in a multiple-cartridge form including the photosensitive drum and the developing roller in a separate manner. The former configuration including the photosensitive drum and the developing roller is called process cartridge. The latter configuration including the photosensitive drum is called drum cartridge. The latter configuration including the developing roller is called development cartridge.
Description of the Related Art
Conventionally, in an image forming apparatus, a process cartridge system is employed, in which a process unit is integrally formed in a cartridge form and this cartridge is attachable to and detachable from an apparatus main body of the image forming apparatus.
With this process cartridge system, since maintenance of the image forming apparatus can be executed by a user without a service person, usability is markedly increased. Hence, this process cartridge system is widely used in the image forming apparatus.
Conventionally, for the process cartridge system, as a configuration that positions the cartridge with respect to an apparatus main body of the image forming apparatus in the longitudinal direction, there is known a configuration provided with a portion that is fitted to the apparatus main body at an end portion in the longitudinal direction (U.S. Pat. No. 8,050,593 and Japanese Patent Laid-Open No. 2003-330335).
The present invention provides a cartridge attachable to and detachable from an image forming apparatus, including a rotatable developer carrying member; and a development container configured to support the developer carrying member. The development container includes a positioning portion and a rotation stop portion provided at one end in an axial direction of the developer carrying member and configured to be engaged with and guided by a guide of the image forming apparatus, and also includes a longitudinal positioning portion provided at the one end in the axial direction of the developer carrying member and configured to contact the guide and position the development container in a longitudinal direction. In a state where the cartridge is attached to the image forming apparatus, when a cross-sectional positioning range is defined by using a width, having one end at a point at which the rotation stop portion contacts the guide and another end at a point at which the positioning portion contacts the guide in an attachment direction of the cartridge, and a height being a width of the guide at the point at which the rotation stop portion contacts the guide or the point at which the positioning portion contacts the guide, the longitudinal positioning portion overlaps the cross-sectional positioning range in the longitudinal direction.
The present invention also provides a member used for a cartridge attachable to and detachable from an image forming apparatus. The cartridge includes a rotatable developer carrying member, and a development container configured to support the developer carrying member. The member includes a positioning portion and a rotation stop portion provided at one end of the development container in an axial direction of the developer carrying member and configured to be engaged with and guided by a guide of the image forming apparatus, and also includes a longitudinal positioning portion provided at the one end in the axial direction of the developer carrying member and configured to contact the guide and position the member in a longitudinal direction. In a state where the cartridge is attached to the image forming apparatus, when a cross-sectional positioning range is defined by using a width, having one end at a point at which the rotation stop portion contacts the guide and another end at a point at which the positioning portion contacts the guide in an attachment direction of the cartridge, and a height being a width of the guide at the point at which the rotation stop portion contacts the guide or the point at which the positioning portion contacts the guide, the longitudinal positioning portion overlaps the cross-sectional positioning range in the longitudinal direction.
Further features of the present invention will become apparent from the following description of exemplary embodiments with reference to the attached drawings.
A cartridge and an image forming apparatus according to an embodiment of the present invention are described with reference to the drawings. In this embodiment, the above-described development cartridge that is attachable to and detachable from the image forming apparatus is exemplarily described. In this specification, the apparatus main body of the image forming apparatus is a residual portion of the image forming apparatus except the cartridge. Also, in the following description, the longitudinal direction is a direction substantially parallel to a rotational axis L1 of a rotatable photosensitive drum (image carrying member) and a rotational axis L9 of a rotatable developing roller (developer carrying member), that is, an axial direction of each of the photosensitive drum and the developing roller. Also, the transverse direction is a direction substantially orthogonal to the rotational axis L1 of the photosensitive drum and the rotational axis L9 of the developing roller. In this embodiment, the direction in which the drum cartridge and the development cartridge are detached from and attached to a laser beam printer main body is the transverse direction of each cartridge. The conveying direction of a recording medium is a direction intersecting with the rotational axis L1 of the photosensitive drum and the rotational axis L9 of the developing roller, that is, the transverse direction. In this case, reference signs in the following description are provided for referencing the drawings, and do not intend to limit the configuration.
(1) General Description on Image Forming Apparatus
First, a general configuration of the image forming apparatus is described with reference to
The image forming apparatus shown in
The photosensitive drum 10 uniformly electrically charges the surface of the photosensitive drum 10 with use of the charging roller 11 by application of a voltage from the apparatus main body A1. Then, the optical unit 1 irradiates the charged photosensitive drum 10 with a laser beam L corresponding to image information, and forms an electrostatic latent image corresponding to the image information on the photosensitive drum 10. This electrostatic latent image is developed by the developing unit (described later) with the toner t, and hence a developer image is formed on the surface of the photosensitive drum 10.
Recording media 2 housed in a sheet feed tray 4 are regulated by a sheet feed roller 3a and a separating pad 3b in pressure contact with the sheet feed roller 3a, and separately fed one by one in synchronization with the formation of the developer image. Then, the separated recording medium 2 is conveyed to a transfer roller 6 serving as a transfer unit by a conveyance guide 3d. The transfer roller 6 is urged to contact the surface of the photosensitive drum 10. Hence, the photosensitive drum 10 and the transfer roller 6 form a transfer nip 6a. The recording medium 2 passes through the transfer nip 6a. At this time, a voltage with a reverse polarity reverse to the developer image is applied to the transfer roller 6. Accordingly, the developer image formed on the surface of the photosensitive drum 10 is transferred to the recording medium 2.
The recording medium 2 having the developer image transferred thereon is regulated by a conveyance guide 3f and conveyed to the fixing unit 5. The fixing unit 5 includes a driving roller 5a and a fixing roller 5c having a heater 5b arranged therein. When the recording medium 2 passes through a nip 5d formed by the driving roller 5a and the fixing roller 5c, heat and pressure are applied to the recording medium 2 and the developer image transferred on the recording medium 2 is fixed to the recording medium 2. Accordingly, the image is formed on the recording medium 2. Then, the recording medium 2 is conveyed by a discharge roller pair 3g, and output to a discharge portion 3h.
At a drive side of the apparatus main body A1, as shown in
Similarly, at a nondrive side of the apparatus main body A1, as shown in
(2) Description on Electrophotographic Image Forming Process
An electrophotographic image forming process is described next with reference to
As shown in
A developer t stored in a developer storage portion 16a of the development container 16 is sent into a development chamber 16c through an opening 16b of the development container 16 when a developer conveying member 17, which is rotatably supported by the development container 16, rotates in an arrow X17 direction. The development container 16 is provided with the developing roller 13 having a magnet roller 12 arranged therein. To be specific, the developing roller 13 includes a shaft portion 13e and a rubber portion 13d. The shaft portion 13e is a long conductive cylindrical shape with a small diameter made of, for example, aluminum. A center portion of the shaft portion 13e in the longitudinal direction is covered with the rubber portion 13d (see
In the case of the contact development method like this embodiment, if the state where the developing roller 13 is in contact with the photosensitive drum 10 as shown in
The charging roller 11, which is rotatably supported by the cleaning frame member 21 and is urged toward the photosensitive drum 10, is provided on the outer peripheral surface of the photosensitive drum 10 in a contact manner. The charging roller 11 uniformly electrically charges the surface of the photosensitive drum 10 by application of a voltage from the apparatus main body A1. The voltage to be applied to the charging roller 11 is set at a value so that the potential difference between the surface of the photosensitive drum 10 and the charging roller 11 is a discharge start voltage or higher. To be specific, a direct-current voltage of −1300 V is applied as a charging bias. At this time, the surface of the photosensitive drum 10 is uniformly electrically charged in a contact manner to −700 V of a charging potential (dark-area potential). Also, in this embodiment, the charging roller 11 is rotationally driven by the rotation of the photosensitive drum 10. Then, an electrostatic latent image is formed on the surface of the photosensitive drum 10 by the laser beam L of the optical unit 1. Then, the developer t is transferred in accordance with the electrostatic latent image of the photosensitive drum 10, the electrostatic latent image is visualized, and hence a developer image is formed on the photosensitive drum 10.
(3) Description on Configuration of Cleanerless System
A cleanerless system used in this embodiment is described next.
In this embodiment, there is not provided a cleaning member that removes a transfer residual developer, which has not been transferred and has remained on the photosensitive drum 10, from the surface of the photosensitive drum 10. That is, the cleanerless system is used.
As shown in
The transfer residual developer, which has passed through the charge nip 11a, reaches a laser irradiation position d. The amount of the transfer residual developer is not so large that blocks the laser beam L of the optical unit, and hence, the transfer residual developer does not affect a step of forming the electrostatic latent image on the photosensitive drum 10. The transfer residual developer, which has passed through the laser irradiation position d and located at a non-exposure area (a portion of the surface of the photosensitive drum 10 not exposed to laser irradiation) is collected by the developing roller 13 using a static force at a development nip 13k being a contact area between the developing roller 13 and the photosensitive drum 10. In contrast, the transfer residual developer in an exposure area (a portion of the surface of the photosensitive drum 10 exposed to laser irradiation) is not collected by the static force, and is continuously present on the photosensitive drum 10. However, a portion of the transfer residual developer is collected by a physical force due to the peripheral speed difference between the developing roller 13 and the photosensitive drum 10.
A major portion of the transfer residual developer not transferred on a sheet and remaining on the photosensitive drum 10 is collected in the development container 16 through the developing roller 13. The transfer residual developer collected in the development container 16 is mixed with the developer t remaining in the development container 16 and used.
In this embodiment, in order to allow the transfer residual developer to pass through the charge nip 11a without adhering to the charging roller 11 and to allow the transfer residual developer to be collected more in the development container 16, the following two configurations are employed. First, an optical static-reducing member 8 is provided between the transfer roller 6 and the charging roller 11. The optical static-reducing member 8 is located at the upstream side of the charge nip 11a in the rotational direction (arrow C5) of the photosensitive drum 10. For stable discharge at the upstream gap portion 11b, the static is reduced for the potential of the surface of the photosensitive drum 10 after passing through the transfer nip 6a. The potential of the photosensitive drum 10 before charging is reduced at about −150 V in the entire longitudinal region by the optical static-reducing member 8. Accordingly, uniform discharge can be executed during charging, and the transfer residual developer can uniformly have the negative polarity.
Second, the charging roller 11 is rotationally driven while a predetermined peripheral speed difference is provided between the charging roller 11 and the photosensitive drum 10. A major portion of the toner has the negative polarity by discharge as described above. However, the transfer residual developer, which has not had the negative polarity, still remains by a small amount, and this transfer residual developer may adhere to the charging roller 11 at the charge nip 11a. Since the charging roller 11 and the photosensitive drum 10 are rotationally driven with the predetermined peripheral speed difference, the aforementioned transfer residual developer can have the negative polarity by sliding between the photosensitive drum 10 and the charging roller 11. Accordingly, there is an effect of reducing adhesion of the transfer residual developer to the charging roller 11. In the configuration of this embodiment, a charging roller gear 69 (
(4) Description on Configuration of Development Cartridge B1 General Configuration of Development Cartridge B1
A configuration of the development cartridge B1 is described next with reference to the drawings. In the following description, it is assumed that a side at which the rotational force is transmitted from the apparatus main body A1 to the development cartridge B1 in the longitudinal direction is referred to as “drive side.” A side opposite to the drive side is referred to as “nondrive side.”
The development cartridge B1 includes the developing roller 13 and the development blade 15. In the development blade 15, a drive-side end portion 15a1 and a nondrive-side end portion 15a2 in the longitudinal direction of a support member 15a are fixed to the development container 16 by a screw 51 and a screw 52. A drive-side development bearing 36 (member) and a nondrive-side development bearing 46 are respectively provided at longitudinal both ends of the development container 16.
A drive-side end portion of the developing roller 13 is fitted to the drive-side development bearing 36, and a nondrive-side end portion of the developing roller 13 is fitted to the nondrive-side development bearing 46. Thus, the developing roller 13 is rotatably supported. Further, at the drive-side end portion of the developing roller 13, a developing roller gear 29 is arranged, coaxially with the developing roller 13, at an outer side in the longitudinal direction with respect to the drive-side development bearing 36. Thus, the developing roller 13 and the developing roller gear 29 are engaged and can be rotated together. The drive-side development bearing 36 rotatably supports a drive input gear 27 at the longitudinal outer side of the drive-side development bearing 36. The drive input gear 27 is meshed with the developing roller gear 29. Further, a coupling member 180 is provided coaxially with the drive input gear 27. Accordingly, the coupling member 180 is engaged with a main-body-side driving member 100 (
A drive-side side cover 34 is provided at the drive-side end portion of the development cartridge B1, to cover the drive input gear 27 and other member from the longitudinal outer side. The coupling member 180 penetrates through the drive-side side cover 34 and protrudes to the longitudinal outer side.
The nondrive-side development bearing 46 includes a guided portion 46d having a positioning portion 46b and a rotation stop portion 46c. The drive-side side cover 34 includes a guided portion 34d having a positioning portion 34b and a rotation stop portion 34c. During attachment and detachment, the guided portions 46d and 34d are guided by the attachment/detachment paths X1b and XH1b, and X2a and XH2b. In this embodiment, the guided portion 34d has a shape in which the positioning portion 34b and the rotation stop portion 34c are integrated at a coupling portion and the coupling portion is narrowed, when viewed in the longitudinal direction. Similarly, the guided portion 46d has a shape in which the positioning portion 46b and the rotation stop portion 46c are integrated at a coupling portion and the coupling portion is narrowed, when viewed in the longitudinal direction.
(5) Brief Description on Drum Cartridge C
A configuration of the drum cartridge C is described next with reference to
The drive-side flange 24 is integrally fixed to a drive-side end portion 10a of the photosensitive drum 10. A nondrive-side flange 28 is integrally fixed to a nondrive-side end portion 10b of the photosensitive drum 10. The drive-side flange 24 and the nondrive-side flange 28 are fixed coaxially with the photosensitive drum 10 by crimping, bonding, or other method. The drum bearing 30 and the drum shaft 54 are respectively fixed to a drive-side end portion and a nondrive-side end portion of both longitudinal end portions of the cleaning frame member 21 by screwing, bonding, press-fitting, or other method. The drive-side flange 24 integrally fixed to the photosensitive drum 10 is rotatably supported by the drum bearing 30, and the nondrive-side flange 28 is rotatably supported by the drum shaft 54.
The charging roller gear 69 is provided at the longitudinal one end of the charging roller 11. The charging roller gear 69 is meshed with a gear portion 24g of the drive-side flange 24. A drive-side end portion 24a of the drive-side flange 24 is configured to receive the rotational force transmitted from the apparatus main body A1 side (not shown). Consequently, the charging roller 11 is also rotationally driven as the photosensitive drum 10 is rotationally driven.
(6) Description on Attachment/Detachment Configuration of Development Cartridge B1 to/from Apparatus Main Body A1
An attachment method of the development cartridge B1 to the apparatus main body A1 is described next with reference to the drawings.
An attachment method of the development cartridge B1 to the apparatus main body A1 is described below. As shown in
Then, the guided portion 46d (
The development cartridge B1 is inserted into the apparatus main body A1 along the attachment/detachment paths X1a and XH1a, and then is further inserted along the attachment/detachment paths X2a and XH2a formed by the first guide portion 80a of the drive-side swing guide 80 and the guide portion 81a of the nondrive-side swing guide 81. To be more specific, the guided portion 34d provided at the drive-side side cover 34 guided by the first guide portion 92a of the apparatus main body A1 is received by the first guide portion 80a having a bending shape of the drive-side swing guide 80 of the apparatus main body A1 by the attachment process. Similarly, at the nondrive side, the guided portion 46d provided at the nondrive-side development bearing 46 guided by the first guide portion 93a of the apparatus main body A1 is received by the guide portion 81a having a bending shape of the nondrive-side swing guide 81 of the apparatus main body A1 by the attachment process. Accordingly, the development cartridge B1 is attached to the apparatus main body A1.
An operation of detaching the development cartridge B1 from the apparatus main body A1 is an operation reverse to the attachment operation.
In this embodiment, a coupling lever 55 and a coupling lever spring 56 are provided at the development cartridge B1. A protrusion 34m of the drive-side side cover 34 is engaged with a recess 55c of the coupling lever 55, and is rotatable. A torsion coil spring is used for the coupling lever spring 56. One end of the coupling lever spring 56 is engaged with the coupling lever 55, and another end thereof is engaged with the drive-side side cover 34. To be specific, a coil-shaped wound portion 56d of the coupling lever spring 56 is engaged with a movement regulation portion 55a. An acting arm 56a of the coupling lever spring 56 is engaged with a spring hook portion 55b of the coupling lever 55. A fixed arm 56c of the coupling lever spring 56 is engaged with a spring hook portion 34s of the drive-side side cover 34 (see
In a state before the development cartridge B1 is attached to the apparatus main body A1, the coupling member 180 is urged by a coupling spring 185, and contacts the drive-side development bearing 36, the drive-side side cover 34, and the coupling lever 55. Accordingly, the coupling member 180 can be in a second inclined posture D2 directed toward the main-body-side driving member 100 of the apparatus main body A1. The coupling member 180 is attached to the apparatus main body A1 while keeping the second inclined posture D2. This second inclined posture D2 is a contact state where the photosensitive drum 10 is in contact with the developing roller 13.
There is a separate state where the development cartridge B1 is attached to the apparatus main body A1 and the photosensitive drum 10 is separated from the developing roller 13 from the contact state. In this case, when the contact state shifts to the separate state, a contact portion 80y (
By the movement of the drive-side swing guide 80, the coupling lever 55 is rotated in the arrow X11 direction around the rotational axis L11. By the movement of the drive-side swing guide 80, the contact portion 80y contacts the rotation regulation portion 55y, and the coupling lever 55 is rotated against the urging force of the coupling lever spring 56. Consequently, since the coupling member 180 is urged by the coupling spring 185 to the retracted coupling lever 55, a rotational force receiving portion of the coupling member 180 may be in a first inclined posture D1 directed to the main-body-side driving member 100 of the apparatus main body A1.
In this embodiment, as described above, the rotational operation of the coupling lever 55 is associated with the drive-side swing guide 80 that moves in accordance with the development separate operation of the development cartridge B1, and the coupling member 180 may be in the first inclined posture D1 or the second inclined posture D2. Attachment/detachment Configuration of Development Cartridge B1
A configuration in which the development cartridge B1 can be attached and detached by the drive-side swing guide 80 and the nondrive-side swing guide 81 of the apparatus main body A1 is described next. The configurations at the drive side and the configuration at the nondrive side are basically similar to one another, and hence the drive side of the development cartridge B1 is exemplarily described.
The drive-side swing guide 80 and a drive-side pressing member 82 are described first with reference to
As shown in
Meanwhile, as shown in
The state of the development cartridge B1 and the drive-side swing guide 80 in a process of attaching the development cartridge B1 to the apparatus main body A1 is described next with reference to
As shown in
Then, as shown in
Next, as shown in
Positioning for the positioning portion 46b of the nondrive-side development bearing 46, and the nondrive-side swing guide 81 is similar to the drive side (the description is omitted). Accordingly, the development cartridge B1 is positioned and fixed with respect to the drive-side swing guide 80 and the nondrive-side swing guide 81.
Guide for Development Cartridge by Swing Guide
A guide configuration in the process of attaching the development cartridge B1 to the apparatus main body A1 is described next in detail. Description is given below for guide for the guided portion 34d of the drive-side side cover 34 by the drive-side swing guide 80, and guide for the guided portion 46d of the nondrive-side development bearing 46 by the nondrive-side swing guide 81.
The guide for the guided portion 34d of the drive-side side cover 34 by the drive-side swing guide 80 is described first with reference to
The guided portion 34d is urged upward by the drive-side pressing member 82. Accordingly, as shown in
Guide for the guided portion 46d of the nondrive-side development bearing 46 by the nondrive-side swing guide 81 is described next with reference to
A method of positioning the development cartridge B1 with respect to the apparatus main body A1 in the longitudinal direction is described next in detail with reference to the drawing.
As shown in
Also, as shown in
Arrangement of the positioning configuration at the drive side is described below in detail.
Also, a range where the second longitudinal positioning surface 34u of the longitudinal positioning portion 34v contacts the second longitudinal positioned surface 80p of the longitudinal positioned portion 80j and hence contacts the drive-side swing guide 80 for positioning in the longitudinal direction serves as a longitudinal positioning range Sb. To be specific, in this embodiment, the longitudinal positioning portion 34v is formed at the coupling portion that couples the positioning portion 34b and the rotation stop portion 34c.
In this embodiment, as shown in
Longitudinal Positioning of Development Cartridge
The positioning direction in the longitudinal direction of the development cartridge B1 in the process of attaching the development cartridge B1 to the apparatus main body A1 is described below with reference to the drawing. In the process of attaching the development cartridge B1 to the apparatus main body A1, the first longitudinal positioning surface 34t of the drive-side side cover 34 is brought into contact with the first longitudinal positioned surface 80k of the drive-side swing guide 80 first, and hence the movement to the one side in the longitudinal direction is regulated. Then, the second longitudinal positioning surface 34u of the drive-side side cover 34 is brought into contact with the second longitudinal positioned surface 80p of the drive-side swing guide 80, and hence the movement to the other side in the longitudinal direction is regulated.
Regulation of First Longitudinal Positioning Surface of Drive-Side Side Cover
A configuration in which the first longitudinal positioning surface 34t of the drive-side side cover 34 regulates the movement in the longitudinal direction at the first longitudinal positioned surface 80k of the drive-side swing guide 80 is described next with reference to the drawings.
As shown in
As the development cartridge B1 is attached to the apparatus main body A1, the first longitudinal positioning surface 34t of the drive-side side cover 34 contacts the first longitudinal positioned surface 80k of the drive-side swing guide 80. Accordingly, the movement of the drive-side side cover 34 is regulated relative to the drive-side swing guide 80 to the Y2 side (outer side in
Regulation of Second Longitudinal Positioning Surface of Drive-Side Side Cover
A configuration in which the second longitudinal positioning surface 34u of the drive-side side cover 34 regulates the movement in the longitudinal direction at the second longitudinal positioned surface 80p of the drive-side swing guide 80 is described next with reference to the drawings.
As shown in
As the development cartridge B1 is attached to the apparatus main body A1, the second longitudinal positioning surface 34u of the drive-side side cover 34 contacts the second longitudinal positioned surface 80p of the drive-side swing guide 80. Accordingly, the movement of the drive-side side cover 34 is regulated relative to the drive-side swing guide 80 to the Y1 side (outer side in
As described above, when the development cartridge B1 is attached to the apparatus main body A1, the longitudinal positioning portion 34v of the drive-side side cover 34 is engaged with the longitudinal positioned portion 80j of the drive-side swing guide 80. The engagement position between the longitudinal positioning portion 34v and the longitudinal positioned portion 80j is located at the upstream side in the attachment/detachment direction X2a with respect to the position at which the engagement between the coupling member 180 and the main-body-side driving member 100 is started. That is, when the engagement between the main-body-side driving member 100 and the coupling member 180 is started, the position of the development cartridge B1 to the Y1 side in the longitudinal direction is regulated. In other words, when the engagement between the main-body-side driving member 100 and the coupling member 180 is started, the longitudinal positions of the coupling member 180 and the main-body-side driving member 100 are regulated at predetermined positions. Hence, the coupling member 180 and the main-body-side driving member 100 can be stably engaged with each other.
(7) Advantageous Effects
Even in this case, since the longitudinal positioning range Sb overlaps the cross-sectional positioning range Sc in this embodiment, the development cartridge B1 can be further reliably attached to the apparatus main body A1. In other words, when the development cartridge B1 is attached to the apparatus main body A1, the development cartridge B1 is prevented from being hooked in the apparatus main body A1, and usability can be increased. To be specific, when the development cartridge B1 is attached to the apparatus main body A1, the positioning portion 34b and the rotation stop portion 34c of the drive-side side cover 34 contact the guide lower surface 80aa by the weight of the development cartridge B1. Consequently, the point P5 of the positioning portion 34b and the point P7 of the rotation stop portion 34c of the drive-side side cover 34 contact the guide lower surface 80aa of the drive-side swing guide 80, and hence serve as the rotation center in a Z direction. Owing to this, in this embodiment, at least a portion of the longitudinal positioning range Sb overlaps the cross-sectional positioning range Sc in the longitudinal direction, and arranged close to the points P5 and P7. Accordingly, the longitudinal positioning range Sb is located at the position close to the rotational center, and the development cartridge B1 can be smoothly attached to the apparatus main body A1 while the drive-side side cover 34 is not hooked to the drive-side swing guide 80.
By providing the first leading shape 34w at the guided portion 34d and providing the first led shape 80m at the drive-side swing guide 80 like this embodiment, the drive-side side cover 34 can be further reliably prevented from being hooked to the drive-side swing guide 80.
Also, since at least a portion of the longitudinal positioning range Sb overlaps the cross-sectional positioning range Sc in the longitudinal direction, the size of the guided portion 34d of the drive-side side cover 34 can be decreased, and hence the development cartridge B1 can be decreased in size. Consequently the size of the apparatus main body A1, to which the development cartridge B1 is attached, can be decreased.
In the above-described embodiment, the configuration has been described in which the photosensitive drum and the developing roller are formed in the individual cartridges and the present invention is applied to the development cartridge. However, without limiting to this configuration, the photosensitive drum serving as the image carrying member and the process unit acting on the photosensitive drum may be integrally formed in a process cartridge, and the process cartridge may be used as the aforementioned cartridge. Various modifications can be made within the scope of the present invention.
While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. The scope of the following claims is to be accorded the broadest interpretation so as to encompass all such modifications and equivalent structures and functions.
This application claims the benefit of Japanese Patent Application No. 2015-183148 filed Sep. 16, 2015, which is hereby incorporated by reference herein in its entirety.
Number | Date | Country | Kind |
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2015-183148 | Sep 2015 | JP | national |
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20070071496 | Lee | Mar 2007 | A1 |
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Number | Date | Country |
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0679966 | Nov 1995 | EP |
0757303 | Feb 1997 | EP |
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2003-330335 | Nov 2003 | JP |
Number | Date | Country | |
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20170075292 A1 | Mar 2017 | US |