An electrophotographic image forming apparatus may supply toner to an electrostatic latent image formed on a photoconductor, form a visible toner image on the photoconductor, transfer the toner image to a print medium, and fix the transferred toner image to the print medium to print an image on the print medium.
A development cartridge includes components for forming a visible toner image and is a consumable that may be replaced, such as at the end of its life. The development cartridge may be detachably attached to a main body of an image forming apparatus. The main body may be provided with a drawer member that may be drawn out from, and pushed into, the main body. The development cartridge may be mounted on the drawer member. The development cartridge may be mounted in the main body by drawing the drawer member from the main body, mounting the development cartridge on the drawer member, and pushing the drawer member into the main body. The development cartridge may be removed from the main body by drawing the drawer member mounted with the development cartridge from the main body and removing the development cartridge from the drawer member.
Various examples will be described below by referring to the following figures.
Hereinafter, examples will be described with reference to the accompanying drawings. In the specification and drawings, like reference numerals may denote like elements having substantially the same functions and configurations, and thus redundant descriptions thereof may be omitted for conciseness.
Referring to
For color printing, the plurality of development cartridges 2 may include four development cartridges 2 for developing images of, for example, cyan (C), magenta (M), yellow (Y), and black (K) colors. Hereinafter, an image forming apparatus including four development cartridges 2 will be described, and when C, M, Y, and K are added to reference numerals, they will refer to components for developing images of cyan (C), magenta (M), yellow (Y), and black (K) colors, respectively, unless otherwise specified.
The main body 1 may be provided with an opening 3 for providing a path through which the development cartridge 2 is mounted/removed. A door 4 may open/close the opening 3. The door 4 may be pivoted on a hinge 4a to open/close the opening 3. The main body 1 may be provided with the exposure unit 13, the transfer unit, and the fixing unit 15. Also, the main body 1 may be provided with a print medium transport unit for loading and transporting the print medium P on which an image is to be formed.
The development cartridge 2 may be an integrated development cartridge. The development cartridge 2 may include a photosensitive unit 100 and a developing unit 200.
The photosensitive unit 100 may include a photosensitive drum 21. As an example of a photoconductor on the surface of which an electrostatic latent image may be formed, the photosensitive drum 21 may include a conductive metal pipe and a photosensitive layer formed at the outer circumference thereof. A charging roller 23 may be an example of a charger for charging the photosensitive drum 21 to have a uniform surface potential. A cleaning blade 25 may be an example of a cleaning unit for removing toner or impurities remaining on the surface of the photosensitive drum 21 after an image transfer process described below.
The developing unit 200 may include a toner container 201. The developing unit 200 may supply toner contained in the toner container 201 to the electrostatic latent image formed on the photosensitive drum 21, to develop the electrostatic latent image into a visible toner image. The developing unit 200 may use a one-component developing method. A developing roller 22 may supply toner to the photosensitive drum 21. A developing bias voltage for supplying the toner to the photosensitive drum 21 may be applied to the developing roller 22. A supply roller 24 may supply toner in the toner container 201 to the surface of the developing roller 22. For this, a supply bias voltage may be applied to the supply roller 24. The developing unit 200 may further include a regulating member (not illustrated) for regulating the amount of toner supplied to a development nip, at which the photosensitive drum 21 and the developing roller 22 contact each other, by the developing roller 22.
The exposure unit 13 may irradiate light modulated corresponding to image information to the photosensitive drum 21 to form an electrostatic latent image on the photosensitive drum 21. The exposure unit 13 may include, for example, a laser scanning unit (LSU) using a laser diode as a light source or a light emitting diode (LED) exposure unit using an LED as a light source.
The transfer unit may include an intermediate transfer belt 31, primary transfer rollers 32, and a secondary transfer roller 33. The intermediate transfer belt 31 may be circulated while being supported by support rollers 34, 35, and 36. Four primary transfer rollers 32 may be arranged at positions facing the photosensitive drums 21 of development cartridges 2C, 2M, 2Y, and 2K, with the intermediate transfer belt 31 therebetween. A primary transfer bias voltage for primarily transferring the toner image developed on the photosensitive drum 21 to the intermediate transfer belt 31 may be applied to the four primary transfer rollers 32. The secondary transfer roller 33 may be located to face the intermediate transfer belt 31. A secondary transfer bias voltage for transferring the toner image primarily transferred to the intermediate transfer belt 31 to the print medium P may be applied to the secondary transfer roller 33.
The print medium P loaded on a loading table 17 may be drawn one by one by a pickup roller 16 and may be transported by a feed roller 18 to a transfer nip formed by the secondary transfer roller 33 and the intermediate transfer belt 31. The toner images primarily transferred onto the intermediate transfer belt 31 may be secondarily transferred to the print medium P by the secondary transfer bias voltage applied to the secondary transfer roller 33. When the print medium P passes through the fixing unit 15, the toner images may be fixed to the print medium P by heat and pressure. Upon completion of the fixing, the print medium P may be discharged outside by a discharge roller 19.
The development cartridges 2C, 2M, 2Y, and 2K may be detachably attached to the main body 1 through the opening 3 opened by the door 4.
Referring to
A structure may be provided for preventing damage to the photosensitive drum 21 and the intermediate transfer belt 31 due to contact between the photosensitive drum 21 and the intermediate transfer belt 31 in the process of sliding the tray 5 between the mounting position and the drawing position. As an example, the tray 5 may move between the mounting position and the drawing position in a state in which the photosensitive drum 21 is spaced apart from the intermediate transfer belt 31.
In the image transfer process, the photosensitive drum 21 may need to contact the intermediate transfer belt 31 when the tray 5 is located at the mounting position. In this regard, the tray 5 may be moved between a position spaced apart from the intermediate transfer belt 31 and a position approaching the intermediate transfer belt 31 in correspondence with the opening/closing operation of the door 4. For example, the tray 5 may slide in the mounting direction B1 to move to the mounting position. When the tray 5 is located at the mounting position and the door 4 is closed, the tray 5 may move in a downward direction C1 in correspondence with the closing operation of the door 4 such that the cartridge 2 approaches the intermediate transfer belt 31. In the mounting position, the photosensitive drum 21 may contact the intermediate transfer belt 31. When the door 4 is opened, the tray 5 may move in an upward direction C2 and thus the photosensitive drum 21 may be spaced apart from the intermediate transfer belt 31. In this state, the tray 5 may be slid to be drawn outside the main body 1 as illustrated in
An example image forming apparatus may move the development cartridge 2 between a first position (indicated by solid lines in
Referring to
When the support member 6 moves in the first direction E1, the development cartridge 2 may move from the second position (see
The development cartridge 2 may include the photosensitive drum 21 on which an electrostatic latent image may be formed. At the second position, the photosensitive drum 21 may be spaced apart from the intermediate transfer belt 31, and at the first position, the photosensitive drum 21 may contact the intermediate transfer belt 31. The support spring 7 may apply, to the support member 6, an elastic force in the second direction E2, that is, an elastic force in a direction of locating the development cartridge 2 at the second position. The link member 8 may press the support member 6 in the first direction E1, that is, in an opposite direction of the elastic force of the support spring 7, to move the development cartridge 2 from the second position to the first position, in correspondence with an operation of the tray 5 being inserted from the drawing position into the mounting position.
Referring to
Referring to
The support spring 7 may apply, to the support member 6, an elastic force in the second direction E2, that is, in the direction of locating the development cartridge 2 at the second position. For example, the support spring 7 may be implemented by a compression coil spring located between the support member 6 and the tray 5.
As the tray 5 approaches the mounting position, the link member 8 may interfere with the support member 6 to move the development cartridge 2 from the second position to the first position. The link member 8 may be provided at the pair of side brackets 11 and 12. For example, the link member 8 may be implemented by an interference protrusion protruding inward from the pair of side brackets 11 and 12.
When the development cartridge 2 is mounted on the tray 5 in a state where the tray 5 is located at the drawing position, the support protrusion 26 may be supported by the support member 6. By the elastic force of the support spring 7, the development cartridge 2 may be located at the second position where the photosensitive drum 21 is spaced apart from the intermediate transfer belt 31. The tray 5 may be slid in the mounting direction B1. Because the development cartridge 2 is located at the second position, interference of the photosensitive drum 21 with the intermediate transfer belt 31 may be reduced or prevented. When the tray 5 approaches the mounting position as illustrated in
When the link member 8 and the inclination portion 62 start to interfere with each other by sliding the tray 5 in the drawing direction B2 in the state illustrated in
In an example, the development cartridge 2 may be maintained at the second position until the tray 5 approaches the mounting position. Thus, because the interference between the photosensitive drum 21 and the intermediate transfer belt 31 does not occur while the tray 5 slides, damage to the photosensitive drum 21 and/or the intermediate transfer belt 31 may be reduced or prevented. Because the tray 5 slides only linearly, a guide structure for guiding the mounting/drawing operation of the tray 5 may be simplified and thus the reliability of the mounting/drawing operation of the tray 5 may be improved and the user may easily mount/draw the tray 5 due to the simple operation of the tray 5. Also, because the opening/closing operation of the door 4 and the lifting operation of the development cartridge 2 may not correspond to each other, no load may be applied when opening/closing the door 4 and thus the opening/closing operation of the door 4 may be smoothly implemented such that user convenience may be improved.
Referring to
The extension portion 61 and the inclination portion 62 of each of the support members 6C, 6M, 6Y, and 6K and the link members 8C, 8M, 8Y, and 8K may be provided such that, when the tray 5 slides in the mounting direction B1, elements corresponding to each other may interfere with each other and elements not corresponding to each other may not interfere with each other. For example, the link member 8K and the extension portion 61 and the inclination portion 62 of the support member 6K located toward the foremost side in the mounting direction B1 may be located toward a lowermost side (e.g., a first level), and the link member 8C and the extension portion 61 and the inclination portion 62 of the support member 6C located toward the rearmost side in the mounting direction B1 may be located toward an uppermost side (e.g., a fourth level). Also, the extension portion 61 and the inclination portion 62 of each of the support members 6C, 6M, 6Y, and 6K and the link members 8C, 8M, 8Y, and 8K may be provided such that they may simultaneously interfere with each other when the tray 5 approaches the mounting position.
When the development cartridges 2C, 2M, 2Y, and 2K are mounted on the tray 5 in a state where the tray 5 is located at the drawing position, the support protrusions 26C, 26M, 26Y, and 26K of the development cartridges 2C, 2M, 2Y, and 2K may be supported by the support members 6C, 6M, 6Y, and 6K. By the elastic force of the support springs 7C, 7M, 7Y, and 7K, the development cartridges 2C, 2M, 2Y, and 2K may be maintained at the second position where the photosensitive drum 21 is spaced apart from the intermediate transfer belt 31 and the tray 5 may be slid in the mounting direction B1. Because the development cartridges 2C, 2M, 2Y, and 2K are located at the second position, interference of the photosensitive drum 21 with the intermediate transfer belt 31 may be reduced or prevented.
As illustrated in
When the link members 8C, 8M, 8Y, and 8K and the inclination portion 62 of each of the support members 6C, 6M, 6Y, and 6K start to interfere with each other by sliding the tray 5 in the drawing direction B2 in the state illustrated in
Referring to
The stopper may function as a position determining member for determining the positions of the development cartridges 2C, 2M, 2Y, and 2K in the main body 1. For this, the first stoppers 14C, 14M, 14Y, and 14K and the second stoppers 27C, 27M, 27Y, and 27K may have shapes to engage with each other. Accordingly, the positional accuracy and stability of the photosensitive drum 21 in the main body 1 may be improved.
In the above example, the link members 8C, 8M, 8Y, and 8K and the support members 6C, 6M, 6Y, and 6K respectively corresponding to the development cartridges 2C, 2M, 2Y, and 2K are used. However, other combinations thereof may also be possible.
Referring to
The first support member 6CM may include first and second support portions 63C and 63M where the support protrusions 26C and 26M of the development cartridges 2C and 2M are respectively seated, a first inclination portion 62CM inclining downward in the mounting direction B1, and first and second extension portions 61-1CM and 61-2CM respectively connecting the first inclination portion 62CM to the first and second support portions 63C and 63M and extending in the mounting direction B1. The first inclination portion 62CM may be located between the first and second support portions 63C and 63M in the mounting direction B1. The first and second extension portions 61-1CM and 61-2CM may be located stepwise with the first inclination portion 62CM as a boundary therebetween. The second extension portion 61-2CM located toward a foreside in the mounting direction B1 may be located below (e.g., at a lower level than) the first extension portion 61-1CM located toward a rear side in the mounting direction B1. The second extension portion 61-2CM may avoid interference with a first link member 8CM corresponding thereto, which will be described below.
The second support member 6YK may include third and fourth support portions 63Y and 63K where the support protrusions 26Y and 26K of the development cartridges 2Y and 2K are respectively seated, a second inclination portion 62YK inclining downward in the mounting direction B1, and third and fourth extension portions 61-1YK and 61-2YK respectively connecting the second inclination portion 62YK to the third and fourth support portions 63Y and 63K and extending in the mounting direction B1. The second inclination portion 62YK may be located between the third and fourth support portions 63Y and 63K in the mounting direction B1. The third and fourth extension portions 61-1YK and 61-2YK may be located stepwise with the second inclination portion 62YK as a boundary therebetween. The fourth extension portion 61-2YK located toward a foreside in the mounting direction B1 may be located below (e.g., at a lower level than) the third extension portion 61-1YK located toward a rear side in the mounting direction B1. The fourth extension portion 61-2YK may avoid interference with a second link member 8YK corresponding thereto, which will be described below.
The link member 8 may include first and second link members 8CM and 8YK respectively corresponding to the first and second support members 6CM and 6YK. The second support member 6YK located toward a foreside in the mounting direction B1 may be located to avoid interference with the first link member 8CM located toward a rear side in the mounting direction B1. Although not illustrated, the support springs 7C and 7M may elastically support the first support member 6CM, and the support springs 7Y and 7K may elastically support the second support member 6YK.
When the tray 5 slides to the mounting position, the first link member 8CM may interfere with the first and second extension portions 61-1CM and 61-2CM and the first inclination portion 62CM of the first support member 6CM and the second link member 8YK may interfere with the third and fourth extension portions 61-1YK and 61-2YK and the second inclination portion 62YK of the second support member 6YK to move the development cartridges 2C, 2M, 2Y, and 2K from the second position to the first position. When the tray 5 is located at the mounting position, the first and second link members 8CM and 8YK may be respectively supported by the first extension portion 61-1CM and the third extension portion 61-1YK.
According to this example, the number of components may be reduced and thus the component cost and the assembly cost may be reduced. Also, because the first link member 8CM is supported by the first extension portion 61-1CM between the first and second support portions 63C and 63M and the second link member 8YK is supported by the third extension portion 61-1YK between the third and fourth support portions 63Y and 63K, the development cartridges 2C, 2M, 2Y, and 2K may stably move to the first position without inclination.
In the above example, a structure in which the development cartridge 2 may move from the second position to the first position by the interference between the link member 8 and the support member 6 is used; however, other structures thereof may also be possible. As an example, the link member 8 may be configured to move the development cartridge 2 from the second position to the first position by pressing the development cartridge 2 in an opposite direction of the elastic force of the support spring 7. In this case, the support member 6 may not need to include the extension portion 61 and the inclination portion 62.
Referring to
The development cartridges 2C, 2M, 2Y, and 2K may be provided with interference portions 28C, 28M, 28Y, and 28K. The interference portions 28C, 28M, 28Y, and 28K may protrude from both side portions of the development cartridges 2C, 2M, 2Y, and 2K. Link members 81C, 81M, 81Y, and 81K may respectively correspond to the interference portions 28C, 28M, 28Y, and 28K and may move the development cartridges 2C, 2M, 2Y, and 2K to the first position by pressing the interference portions 28C, 28M, 28Y, and 28K in an opposite direction of the elastic force of the support springs 7C, 7M, 7Y, and 7K as the tray 5 approaches the mounting position. The link members 81C, 81M, 81Y, and 81K may be provided, for example, at the pair of side brackets 11 and 12. The interference portions 28C, 28M, 28Y, and 28K may have different protrusion amounts such that the interference portions 28C, 28M, 28Y, and 28K may interfere only with the corresponding members among the link members 81C, 81M, 81Y, and 81K. For example, the interference portion 28K located toward the foremost side in the mounting direction B1 of the tray 5 may have the smallest protrusion amount and the interference portion 28C located toward the rearmost side in the mounting direction B1 of the tray 5 may have the largest protrusion amount. Also, the link member 81K may be located toward the innermost side in the widthwise direction and the link member 81C may be located toward the outermost side in the widthwise direction.
The link members 81C, 81M, 81Y, and 81K may include elastic members. For example, the link members 81C, 81M, 81Y, and 81K may be implemented by leaf springs. In this case, the magnitude of the elastic force of the link members 81C, 81M, 81Y, and 81K may be greater than the magnitude of the elastic force of the support springs 7C, 7M, 7Y, and 7K.
By this configuration, when the tray 5 reaches the mounting position, the link members 81C, 81M, 81Y, and 81K may move the development cartridges 2C, 2M, 2Y, and 2K from the second position to the first position by pressing the interference portions 28C, 28M, 28Y, and 28K in an opposite direction of the elastic force of the support springs 7C, 7M, 7Y, and 7K. Also, because the elastic force of the link members 81C, 81M, 81Y, and 81K is applied to the development cartridges 2C, 2M, 2Y, and 2K, the development cartridges 2C, 2M, 2Y, and 2K may be stably maintained at the first position. Also, according to the structure in which the second stoppers 27C, 27M, 27Y, and 27K provided at the development cartridges 2C, 2M, 2Y, and 2K are supported at the first position by the first stoppers 14C, 14M, 14Y, and 14K provided at the pair of side brackets 11 and 12, the positional stability of the development cartridges 2C, 2M, 2Y, and 2K may be further improved.
The structure illustrated in
It should be understood that examples described herein should be considered in a descriptive sense only and not for purposes of limitation. Descriptions of features or aspects within each example should typically be considered as available for other similar features or aspects in other examples. While one or more examples have been described with reference to the figures, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope as defined by the following claims.
Number | Date | Country | Kind |
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10-2019-0104771 | Aug 2019 | KR | national |
Filing Document | Filing Date | Country | Kind |
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PCT/US2020/018090 | 2/13/2020 | WO | 00 |