The present invention relates to a system for preventing erroneous mounting of a cartridge on an apparatus main body of an image forming apparatus.
There has been widely known a configuration improving replacement convenience by unitizing process units, such as a photosensitive drum, and consumables, such as a toner container, into a cartridge, for an electrophotographic image forming apparatus.
Meanwhile, there may be a plurality of types of cartridges and a plurality of types of apparatus main bodies for image forming apparatuses. Japanese Patent No. 06049376 discusses an erroneous mounting prevention mechanism for preventing a cartridge incompatible with the apparatus main body from being mounted on the apparatus main body in this case.
According to an aspect of the present invention, an erroneous mounting prevention system includes a first cartridge including a first restricted portion, a second cartridge including a protruding portion and a second restricted portion, a first apparatus main body configured to allow the first cartridge to be mounted thereon and prevent the second cartridge from being mounted thereon, and a second apparatus main body configured to prevent the first cartridge from being mounted and allow the second cartridge to be mounted on the second apparatus main body, the second apparatus main body including a recessed portion and a restriction member configured to be movable between a restriction position in which the first and second cartridges are restricted to be mounted thereon and a non-restriction position in which the first and second cartridges are not restricted to be mounted thereon, wherein the first cartridge includes no portion corresponding to the protruding portion of the second cartridge, and the first apparatus main body includes a surface portion at a position corresponding to the recessed portion of the second apparatus main body and includes no member corresponding to the restriction member of the second apparatus main body, wherein by moving the second cartridge in a mounting direction to mount the second cartridge on the second apparatus main body, the protruding portion passes through the recessed portion and is brought into abutment with the restriction member to move the restriction member from the restriction position to the non-restriction position, thereby the second restricted portion passes through a region in which the restriction member is located when the restriction member is in the restriction position, so that the second cartridge is allowed to be mounted on the second apparatus main body, wherein by moving the first cartridge in the mounting direction to mount the first cartridge on the second apparatus main body, the first restricted portion is brought into abutment with the restriction member located at the restriction position, thereby the first cartridge is restricted to be moved in the mounting direction and is prevented from being mounted on the second apparatus main body, wherein by moving the second cartridge in the mounting direction to mount the second cartridge on the first apparatus main body, the protruding portion is brought into abutment with the surface portion, thereby the second cartridge is restricted to be moved in the mounting direction and is prevented from being mounted on the first apparatus main body, and wherein by moving the first cartridge in the mounting direction to mount the first cartridge on the first apparatus main body, the first cartridge is mounted on the first apparatus main body without being restricted from being moved by the surface portion.
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 exemplary embodiment of the present invention will be described with reference to the drawings. In the following description, the image forming apparatus and the cartridge will be described, using a laser beam printer and a cartridge used in the laser beam printer as examples thereof.
In the following description, a longitudinal direction Y is defined to match a direction along a rotational axis of a photosensitive drum, which is an image bearing member. Further, a driven side and a non-driven side are defined to refer to a side to which driving is transmitted from a main body of the image forming apparatus to the photosensitive drum and an opposite side therefrom in the longitudinal direction Y, respectively.
Further, the reference numerals in the description are intended to facilitate the reference to the drawings, and are not intended to limit the configuration.
A configuration in common between a first apparatus main body A1 and a second apparatus main body A2, and a configuration in common between a first cartridge B1 and a second cartridge B2, in configurations of an apparatus main body and a cartridge of an image forming apparatus according to a first exemplary embodiment, will be described with reference to
The image forming apparatus illustrated in
A sheet tray 4, on which a recording medium used to form an image thereon (hereinafter referred to as a “sheet P”) is stacked, is disposed vertically below the cartridge B.
Further, a pickup roller 5a, a pair of feeding rollers 5b, a transfer guide 6, a transfer roller 7, a conveyance guide 8, a fixing device 9, a pair of discharge rollers 10, a discharge tray 11, and the like are disposed in the apparatus main body A in series along a direction D in which the sheet material P is conveyed. The fixing device 9 includes a heating roller 9a and a pressing roller 9b.
Next, an image forming process will be schematically described. A photosensitive drum 62 is rotationally driven at a predetermined circumferential speed (process speed) in a direction indicated by an arrow R based on a print start signal.
A charging roller (charging member) 66 with a bias voltage applied thereto is in contact with an outer peripheral surface of the photosensitive drum 62, and evenly charges the outer peripheral surface of the photosensitive drum 62.
A laser scanner 3 as an exposure device outputs laser light L based on image information. This laser light L passes through a laser opening 71h provided on a drum frame member 71 of the cartridge B, and scans and exposes the outer peripheral surface of the photosensitive drum 62. As a result, an electrostatic latent image based on the image information is formed on the outer peripheral surface of the photosensitive drum 62.
On the other hand, as illustrated in
The toner T is borne on a surface of a development roller 32 due to a magnetic force of a magnet roller 34 (stationary magnet). The development roller 32 is a developer bearing member that bears a developer (toner T) on a surface thereof to develop the latent image formed on the photosensitive drum 62. While the toner T is triboelectrically charged by a development blade 42, a layer thickness of the toner T is regulated on the circumferential surface of the development roller 32 as the developer bearing member. The toner T is supplied to the photosensitive drum 62 based on the electrostatic latent image, and develops the latent image. As a result, the latent image is visualized as a toner image. The photosensitive drum 62 is an image bearing member that bears the latent image and the toner image, which is an image formed with the toner T, on the surface thereof. Further, as illustrated in
The sheet material P with the toner image transferred thereon is separated from the photosensitive drum 62 and conveyed to the fixing device 9 along the conveyance guide 8. Then, the sheet material P passes through a fixing nip portion formed by the heating roller 9a and the pressing roller 9b that form the fixing device 9. The sheet material P with the toner image formed thereon is subjected to pressing and heating fixing processing at this fixing nip portion, and thereby the toner image is fixed onto the sheet material P. The sheet material P subjected to the processing for fixing the toner image is conveyed to the pair of discharge rollers 10 and discharged onto the discharge tray 11.
On the other hand, as illustrated in
In the above-described configuration, the charging roller 66, the development roller 32, the transfer roller 7, and the cleaning blade 77 are process units that work on the photosensitive drum 62.
Next, an overall configuration of the cartridge B will be described with reference to
The cartridge B includes the drum unit 60 and the development unit 20. The cartridge B is a unit formed by unitizing the photosensitive drum 62 and at least one of the process units working thereon into a cartridge. The cartridge B is configured to be attachable to and detachable from the apparatus main body A of the image forming apparatus. Examples of the process units include the charging unit, the development unit, and the cleaning unit.
As illustrated in
The photosensitive drum 62 is configured in such a manner that a hole portion (not illustrated) of a drum flange on the non-driven side is rotatably supported by a drum shaft 78, which is press-fitted in a hole portion 71c provided on the drum frame member 71, on the non-driven side as one end side as illustrated in
Each of the drum flanges is a borne portion rotatably supported by the bearing portion. In the drum unit 60, the charging roller 66 and the cleaning blade 77 are each disposed in contact with the outer peripheral surface of the photosensitive drum 62.
The cleaning blade 77 includes a rubber blade 77a, which is a blade-shaped elastic member made of rubber as an elastic material, and a support member 77b supporting the rubber blade 77a. The rubber blade 77a is in abutment with the photosensitive drum 62 in a counter direction to a rotational direction of the photosensitive drum 62. In other words, the rubber blade 77a is in abutment with the photosensitive drum 62 in such a manner that a distal end portion thereof faces an upstream side in the rotational direction of the photosensitive drum 62.
As illustrated in
Further, as illustrated in
The charging roller 66 is rotatably attached to the drum unit 60 via charging roller bearings 67 at both end portions of the drum frame member 71 in the longitudinal direction Y. The charging roller bearings 67 are each pressed toward the photosensitive drum 62 by a biasing member 68, by which the charging roller 66 is in pressure contact with the photosensitive drum 62. The charging roller 66 is driven to be rotated following the rotation of the photosensitive drum 62.
As illustrated in
Further, the magnet roller 34 is provided in the development roller 32. The development blade 42 for regulating the toner layer on the development roller 32 is disposed in the development unit 20. As illustrated in
As illustrated in
When the development unit 20 and the drum unit 60 are joined, first, a center of a development first support boss 26a of the bearing member 26 is aligned with a first suspension hole 71i on the driven side of the drum frame member 71, and a center of a development second support boss 27a of the bearing member 27 is aligned with a second suspension hole 71j on the non-driven side. More specifically, the development first support boss 26a and the development second support boss 27a are fitted in the first suspension hole 71i and the second suspension hole 71j, respectively, by moving the development unit 20 in a direction indicated by an arrow G. In this way, the development unit 20 is movably coupled with the drum unit 60. More specifically, the development unit 20 is rotationally movably (rotatably) coupled with the drum unit 60. In other words, the development roller 32 is coupled with the photosensitive drum 62 in a contactable and separable state. After that, the cartridge B is assembled by mounting the drum bearing 73 on the drum unit 60.
In the present exemplary embodiment, a driven-side biasing member 46L (see
In this case, it is desirable that the distance between the photosensitive drum 62 and the development roller 32 is accurately kept at a constant distance to stably develop the electrostatic latent image on the photosensitive drum 62 with the toner T borne on the circumferential surface of the development roller 32. In other words, the contact pressure should be kept stable when the photosensitive drum 62 and the development roller 32 are in contact with each other via the space holding members 38.
Next, the mounting of the cartridge B onto the apparatus main body A will be specifically described with reference to
As illustrated in
A non-driven-side guide 16 is provided on the non-driven side of the mounting portion S as illustrated in
First, as illustrated in
As illustrated in
Further, the positioned portion 71d and the rotation regulating portion 71g are guided by the non-driven-side upper guide 16d and the non-driven-side lower guide 16e on the non-driven side of the cartridge B, respectively. The rotation regulating portion 73c is guided by the driven-side guide portion 15d on the driven side of the cartridge B.
When the cartridge B is moved toward the mounting portion S, a position (track) of the cartridge B in a direction intersecting the mounting direction C and the longitudinal direction Y (this direction will be referred to as a vertical direction Z) is determined. In this way, the cartridge B is mounted onto the apparatus main body A following the determined mounting track (the mounting direction C).
Next, how the open/close door 13 is closed will be described. As illustrated in
Further, cartridge pressing members 1 and 2 are rotatably attached at both ends of the open/close door 13 in a direction along a rotational axis of the open/close door 13. Cartridge pressing springs 19 and 21 are attached at both ends of a front plate provided on the apparatus main body A in the longitudinal direction Y. The drum bearing 73 includes a pressed portion 73e as a biasing force reception portion, and the drum frame member 71 includes a pressed portion 710 on the non-driven side. Closing the open/close door 13 causes the pressed portions 73e and 710 of the cartridge B to be pressed by the cartridge pressing members 1 and 2 biased by the cartridge pressing springs 19 and 21 of the apparatus main body A (refer to
With this configuration, the first positioned portion 73d, the rotation regulated portion 73f, and the rotation regulating portion 73c of the cartridge B are brought into abutment with the first positioning portion 15a, the second positioning portion 15b, and the rotation prohibition portion 15c of the apparatus main body A, respectively, on the driven side. As a result, the cartridge B and the photosensitive drum 62 are positioned on the driven side. Further, the positioned portion 71d and the rotation regulating portion 71g of the cartridge B are brought into abutment with the positioning portion 16a and the rotation prohibition portion 16c of the apparatus main body A, respectively, on the non-driven side. In this way, the cartridge B and the photosensitive drum 62 are positioned on the non-driven side.
As described above, the cartridge B is mounted onto the mounting portion S of the apparatus main body A. The above-described configuration is an example of the configuration for determining the position of the cartridge B with respect to the apparatus main body A, and is not described with the intention to set any limit on the unit as the positioning means. The image forming apparatus may be configured to directly work on the positioned portion 71d and the rotation regulating portion 71g on the non-driven side of the cartridge B and the first positioned portion 73d and the rotation regulated portion 73f on the driven side and fix each of the positioning portions.
An erroneous mounting prevention system according to the present exemplary embodiment will be described with reference to
A rib 71p (protruding portion) as an identified portion extending in the direction intersecting the longitudinal direction Y and the mounting direction C (vertical direction Z) is provided at the end portion of the second cartridge B2 on the non-driven side as illustrated in
An identification rail 16f is provided on the second apparatus main body A2. The identification rail 16f includes a cutout portion 16f1 (a recessed portion) as a guide portion, which is provided along the mounting direction C, at a position that matches the rib 71p of the second cartridge B2 in the longitudinal direction Y. Further, a movable lever 16g (restriction member) is provided at the non-driven-side guide 16 on the second apparatus main body A2 as illustrated in
On the other hand, no portion corresponding to the rib 71p of the second cartridge B2 is provided at the end portion of the first cartridge B1 on the non-driven side as illustrated in
<Mounting of Second Cartridge B2 onto Second Apparatus Main Body A2>
A configuration that allows the second cartridge B2 to be mounted on the second apparatus main body A2 will be described with reference to
As illustrated in
The non-restriction position is a position to which the movable lever 16g is retracted from the mounting route G1 (
In this way, when the second cartridge B2 compatible with the second apparatus main body A2 is mounted onto the second apparatus main body A2, the rib 71p passes through the cutout portion 16f1 of the identification rail 16f and causes the rotation of the movable lever 16g. Then, the movable lever 16g is rotated from the restriction position to the non-restriction position, by which the second cartridge B2 is allowed to be mounted on the second apparatus main body A2 without the positioned portion 71d being restricted by the lever restriction surface 16g2.
<Mounting of First Cartridge B1 onto Second Apparatus Main Body A2>
A configuration that prevents the first cartridge B1 from being erroneously mounted on the second apparatus main body A2 will be described.
Because the first cartridge B1 include no portion corresponding to the rib 71p of the second cartridge B2, the first cartridge B1 is moved in the mounting direction C without the drum frame member 71 interfering with the identification rail 16f on the non-driven side. Further, the first cartridge B1 is moved in the mounting direction C without abutting against the abutment surface 16g3 of the movable lever 16g. The positioned portion 71d of the first cartridge B1 is brought into abutment with the lever restriction surface 16g2 of the movable lever 16g located at the restriction position. Then, a force F2 is applied from the user to the lever restriction surface 16g2 via the positioned portion 71d2. However, because the lever restriction surface 16g2 is the surface having the normal line facing the direction indicated by the arrow N3, the force F2 works in a direction for rotating the movable lever 16g in the direction indicated by the arrow N1 (the direction from the non-restriction position toward the restriction position). The lever restriction surface 16g2 is configured to generate a rotational moment in a direction for rotating the movable lever 16g from the non-restriction position to the restriction position when the positioned portion 71d is brought into abutment therewith.
Accordingly, the movable lever 16g cannot be moved more than that, and is kept in a state intruding in the mounting route G1. Thus, the first cartridge B1 is prevented from being erroneously mounted on the second apparatus main body A2.
<Mounting of First Cartridge B1 onto First Apparatus Main Body A1>
A configuration that allows the first cartridge B1 to be mounted on the first apparatus main body A1 will be described with reference to
<Mounting of Second Cartridge B2 onto First Apparatus Main Body A1>
A configuration that prevents the second cartridge B2 from being erroneously mounted on the first apparatus main body A1 will be described with reference to
As illustrated in
A third apparatus main body A3 and a third cartridge B3, as illustrated in
When the user attempts to mount the third cartridge B3 on the first apparatus main body A1, the rib 71q3 is brought into abutment with the surface portion 16f2 and the third cartridge B3 is prohibited from being moved in the mounting direction C, and therefore the third cartridge B3 is prevented from being mounted on the first apparatus main body A1. When the user attempts to mount the third cartridge B3 on the second apparatus main body A2, the result thereof is as follows. Because the rib 71q3 and the cutout portion 16f1 (first recessed portion) of the identification rail 16f are located at the different positions from each other, the rib 71q3 cannot pass through the cutout portion 16f1 and thus the third cartridge B3 is prevented from being mounted on the second apparatus main body A2. When the user attempts to mount the third cartridge B3 on the third apparatus main body A3, the rib 71q3 passes through the cutout 16f3, by which the third cartridge B3 is allowed to be mounted on the third apparatus main body A3.
In the above-described manner, according to the present exemplary embodiment, the erroneous mounting prevention system can be constructed using the simply structured apparatus main body (first apparatus main body A1). Further, compatible/incompatible combinations can also be increased by setting the third apparatus main body and the third cartridge.
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. 2019-034906, filed Feb. 27, 2019, which is hereby incorporated by reference herein in its entirety.
Number | Date | Country | Kind |
---|---|---|---|
2019-034906 | Feb 2019 | JP | national |