BACKGROUND OF THE INVENTION
Field of the Invention
[0001] The present invention relates to a developer storage container provided in an image
forming apparatus such as a copier or a printer and to remanufacturing of a cartridge
such as a developing apparatus or a process cartridge provided with the developer
storage container.
Description of the Related Art
[0002] Among image forming apparatuses using an electrophotographic image formation system
(an electrophotographic process), image forming apparatuses with superior usability
in which various process means are integrated as a cartridge configured so as to be
attachable to and detachable from an image forming apparatus main body are being put
to practical use for the purpose of facilitating maintenance. With such a cartridge
system image forming apparatus, an image is formed on a recording material (a recording
medium) using toner stored in a cartridge (a developing apparatus formed as a cartridge
or a process cartridge). The toner stored in the cartridge is consumed as image formation
is performed, and once the toner is consumed to such an extent that images of high
enough quality to satisfy a user having purchased the cartridge can no longer be formed,
the cartridge loses its commercial value.
[0003] In recent years, cartridges having lost their commercial values once their toner
has been consumed are being remanufactured (recycled). As such a remanufacturing method,
for example, a method has been proposed which involves boring a hole at one end in
a longitudinal direction of a developer storage chamber in a cartridge, refilling
the developer storage chamber with toner from the bored hole, and sealing the hole
with a sealing member once the refill is completed (Japanese Patent Application Laid-open
No.
2002-328588). In addition, as a remanufacturing method of a cartridge, a method has also been
proposed which involves boring a hole on a surface parallel to a photosensitive member
axis of a developer storage chamber in a cartridge, refilling the developer storage
chamber with toner from the bored hole, and sealing the hole with a sealing member
once the refill is completed (Japanese Patent Application Laid-open No.
2002-251119).
[0004] The cartridges described above include those that have a stirring member for stirring
toner inside a developer storage chamber. With such cartridges, the stirring member
arranged inside the developer storage chamber may sometimes interfere with the remanufacturing
process described above.
[0005] The present invention provides a remanufacturing method of a cartridge which prevents
work from being disturbed by a stirring member of the cartridge.
SUMMARY OF THE INVENTION
[0006] The remanufacturing method according to the present invention is
a remanufacturing method for remanufacturing a developing apparatus as specified in
claims 1 to 8, and 15 to 19.
[0007] In addition, the remanufacturing method according to the present invention is
a remanufacturing method for remanufacturing a developing apparatus as specified in
claims 9 to 19,
[0008] Furthermore, the cartridge according to the present invention is
a cartridge as specified in claim 20.
[0009] Further features of the present invention will become apparent from the following
description of exemplary embodiments (with reference to the attached drawings).
BRIEF DESCRIPTION OF THE DRAWINGS
[0010]
FIG. 1 is a sectional view showing a refilling process in remanufacturing of a developer
storage container according to a first embodiment;
FIG. 2 is a sectional view of an electrophotographic image forming apparatus according
to the first embodiment;
FIG. 3 is a perspective view of a process cartridge according to the first embodiment
when mounting the process cartridge to an apparatus main body;
FIG. 4 is a sectional view of the process cartridge according to the first embodiment;
FIG. 5 is a sectional view showing a configuration of the developer storage container
according to the first embodiment;
FIGS. 6A and 6B are an exploded view and a perspective view showing a configuration
of the developer storage container according to the first embodiment;
FIGS. 7A and 7B are explanatory diagrams of a communicating process in a remanufacturing
method of a cartridge according to the first embodiment;
FIGS. 8A and 8B are explanatory diagrams of the communicating process in the remanufacturing
method of a cartridge according to the first embodiment;
FIG. 9 is an explanatory diagram of a refilling process in the remanufacturing method
of a cartridge according to the first embodiment;
FIGS. 10A and 10B are explanatory diagrams of a sealing process in the remanufacturing
method of a cartridge according to the first embodiment;
FIGS. 11A and 11B are explanatory diagrams of the sealing process in the remanufacturing
method of a cartridge according to the first embodiment;
FIGS. 12A and 12B are explanatory diagrams of the sealing process in the remanufacturing
method of a cartridge according to the first embodiment; and
FIG. 13 is an explanatory diagram of a communicating process according to a second
embodiment.
DESCRIPTION OF THE EMBODIMENTS
[0011] Hereinafter, a description will be given, with reference to the drawings, of embodiments
(examples) of the present invention. However, the sizes, materials, shapes, their
relative arrangements, or the like of constituents described in the embodiments may
be appropriately changed according to the configurations, various conditions, or the
like of apparatuses to which the invention is applied. Therefore, the sizes, materials,
shapes, their relative arrangements, or the like of the constituents described in
the embodiments do not intend to limit the scope of the invention to the following
embodiments.
First Embodiment
[0012] Configurations of a process cartridge 7 and an image forming apparatus 100 according
to an embodiment of the present invention will be described with reference to FIGS.
2 to 4. FIG. 2 is a schematic sectional view of the image forming apparatus 100 according
to the present embodiment. FIG. 3 is a schematic perspective view showing a situation
where the process cartridge 7 is mounted to an image forming apparatus main body,
in which illustration of components such as a cover that closes a storage portion
of the process cartridge 7 in the apparatus main body is omitted. FIG. 4 is a schematic
sectional view of the process cartridge 7 according to the present embodiment.
Electrophotographic Image Forming Apparatus
[0013] First, an overall configuration of an electrophotographic image forming apparatus
(hereinafter, referred to as an "image forming apparatus") according to the present
embodiment will be described with reference to FIGS. 2, 3, and 4. As a plurality of
image forming portions, the image forming apparatus 100 includes first, second, third,
and fourth image forming portions SY, SM, SC, and SK for respectively forming images
of the colors yellow (Y), magenta (M), cyan (C), and black (K). In the present embodiment,
configurations and operations of the first to fourth image forming portions are substantially
the same with the exception of differences in colors of formed images. Therefore,
unless a specific distinction must be made, Y, M, C, and K will be omitted and the
image forming portions will be collectively described.
[0014] The image forming apparatus 100 according to the present embodiment includes four
electrophotographic photosensitive drums (hereinafter, referred to as "photosensitive
drums") 1 (1Y, 1M, 1C, and 1K) as four image bearing members. The photosensitive drum
1 rotates in a direction of an arrow A in the drawings. A charging roller 2 and a
scanner unit 3 are arranged around the photosensitive drum 1. In this case, the charging
roller 2 is charging means which uniformly charges a surface of the photosensitive
drums 1. In addition, the scanner unit 3 is exposing means which irradiates a laser
based on image information and forms an electrostatic image on the photosensitive
drums 1. Developing apparatuses (hereinafter, referred to as "developing units") 4
(4Y, 4M, 4C, and 4K) and cleaning blades 6 (6Y, 6M, 6C, and 6K) as cleaning means
are arranged in a periphery of the photosensitive drums 1. Furthermore, an intermediate
transfer belt 5 as an intermediate transfer member for transferring a toner image
on the photosensitive drums 1 to a recording material 12 is arranged so as to oppose
the four photosensitive drums 1.
[0015] In the present embodiment, the developing units 4 use toners T (TY, TM, TC, and TK)
which are non-magnetic single component developers as developers. In the present embodiment,
the developing units 4 perform contact development by bringing a developer bearing
member (hereinafter, referred to as a "developing roller") 22 as developing means
into contact with the photosensitive drums 1.
[0016] In the present embodiment, photosensitive units 13 (13Y, 13M, 13C, and 13K) are formed
by the photosensitive drums 1, the charging roller 2, the cleaning blades 6, and a
waste toner storage portion 14a for storing primary transfer residual toner that remains
on the photosensitive drum 1.
[0017] Furthermore, in the present embodiment, the process cartridges 7 (7Y, 7M, 7C, and
7K) are formed by integrating the developing unit 4 and the photosensitive unit 13
into a cartridge. The process cartridges 7 are configured so as to be attachable to
and detachable from the image forming apparatus 100 via mounting means such as a mounting
guide or a positioning member (not shown) provided on the image forming apparatus
100. In the present embodiment, the process cartridges 7 are attachable to and detachable
from the image forming apparatus 100 in an axial direction of the photosensitive drums
1 as indicated by an arrow G in FIG. 3.
[0018] In the present embodiment, the process cartridges 7 for the respective colors all
have the same shape. The process cartridges 7 for the respective colors store toners
T (TY, TM, TC, and TK) of the respective colors of yellow (Y), magenta (M), cyan (C),
and black (K).
[0019] The intermediate transfer belt 5 is in contact with all photosensitive drums 1 and
rotates in a direction of an arrow B in FIG. 2. The intermediate transfer belt 5 is
stretched over a plurality of supporting members (a driver roller 26, a secondary
transfer opposing roller 27, and a driven roller 28). Four primary transfer rollers
8 (8Y, 8M, 8C, and 8K) as primary transfer means are arranged side by side on a side
of an inner peripheral surface of the intermediate transfer belt 5 so as to oppose
each photosensitive drum 1. In addition, a secondary transfer roller 9 as secondary
transfer means is arranged at a position opposing the secondary transfer opposing
roller 27 on a side of an outer peripheral surface of the intermediate transfer belt
5.
Image Forming Process
[0020] During image formation, first, the surface of the photosensitive drum 1 is uniformly
charged by the charging roller 2. Next, due to laser light in accordance with image
information emitted from the scanner unit 3, the charged surface of the photosensitive
drum 1 is subjected to scanning exposure and an electrostatic latent image in accordance
with the image information is formed on the photosensitive drum 1. The electrostatic
latent image formed on the photosensitive drum 1 is then developed by the developing
unit 4 as a toner image (a developer image). The toner image formed on the photosensitive
drum 1 is transferred (primarily transferred) onto the intermediate transfer belt
5 by an action of the primary transfer roller 8.
[0021] For example, when forming a full-color image, the process described above is sequentially
performed in the first to fourth image forming portions SY, SM, SC, and SK, and toner
images of the respective colors are primarily transferred onto the intermediate transfer
belt 5 by being sequentially superimposed on one another. Subsequently, the recording
material 12 is transported to a secondary transfer portion in synchronization with
a movement of the intermediate transfer belt 5. In addition, due to an action of the
secondary transfer roller 9 in contact with the intermediate transfer belt 5 via the
recording material 12, the four-color toner images on the intermediate transfer belt
5 are collectively secondarily transferred onto the recording material 12.
[0022] The recording material 12 onto which the toner images have been transferred is transported
to a fixing apparatus 10 as fixing means. Heat and pressure are applied to the recording
material 12 by the fixing apparatus 10 to fix the toner images onto the recording
material 12. Subsequently, the recording material 12 on which the toner images have
been fixed is discharged to outside of the machine.
[0023] Primary transfer residual toner that remains on the photosensitive drum 1 after the
primary transfer process is removed by the cleaning blade 6. In addition, secondary
transfer residual toner that remains on the intermediate transfer belt 5 after the
secondary transfer process is removed by an intermediate transfer belt cleaning apparatus
11. The removed secondary transfer residual toner is discharged to a waste toner box
(not shown) of the image forming apparatus 100.
[0024] The image forming apparatus 100 is also configured so as to be capable of forming
a single-color or multi-color image using only a single or some (not all) desired
image forming portions.
Process Cartridge
[0025] An overall configuration of the process cartridge 7 to be mounted to the image forming
apparatus 100 according to the present embodiment will now be described with reference
to FIGS. 4, 6A, and 6B. FIG. 6A is an exploded view of the developing unit 4 and FIG.
6B is a perspective view of the developing unit 4.
[0026] As shown in FIG. 4, the photosensitive unit 13 includes a cleaning frame 14 as a
frame that supports various elements inside the photosensitive unit 13. The photosensitive
drum 1 is attached to the cleaning frame 14 via a bearing member so that the photosensitive
drum 1 is rotatable in a direction of an arrow A. In addition, a charging roller bearing
15 is attached to the cleaning frame 14 along a line that passes through a center
of rotation of the charging roller 2 and a center of rotation of the photosensitive
drum 1 so as to be movable in a direction of an arrow C. The charging roller 2 is
rotatably attached to the charging roller bearing 15. In addition, the charging roller
bearing 15 is biased toward the photosensitive drum 1 by a charging roller pressure
spring 16 as biasing means.
[0027] The cleaning blade 6 is integrally formed by an elastic member 6a for removing primary
transfer residual toner that remains on the surface of the photosensitive drum 1 after
primary transfer and a supporting member 6b for supporting the elastic member. The
primary transfer residual toner having been removed from the surface of the photosensitive
drum 1 by the cleaning blade 6 drops in a direction of gravity in a space formed by
the cleaning blade 6 and the cleaning frame 14 and is stored in the waste toner storage
portion 14a.
[0028] As shown in FIGS. 6A and 6B, the developing unit 4 includes a developing frame 18
which supports various elements inside the developing unit 4 and which is also a developer
storage container. The developing unit 4 is provided with a developing roller 22 which
comes into contact with the photosensitive drum 1 and rotates in a direction of an
arrow D. The developing roller 22 is rotatably supported at both ends in a direction
of a rotational axis thereof by the developing frame 18 via bearing units 32 and 33.
[0029] The developing unit 4 has a developer storage chamber (a storage chamber) 18a for
storing toner, a developing chamber 18b in which the developing roller 22 is arranged,
and an opening (an internal opening or a first opening) 18c which connects the developer
storage chamber 18a and the developing chamber 18b each other. More specifically,
the developing frame 18 has a partition portion (a partition wall) 18m which partitions
the developer storage chamber 18a and the developing chamber 18b of the developing
frame 18. The opening 18c is provided in the partition portion 18m. In addition, the
developing frame 18 is provided with a developer opening (a second opening) for exposing
a part of the developing roller 22 to outside of the developing frame 18. In the present
embodiment, when the process cartridge 7 is in a posture when the developing unit
4 being used (when the process cartridge 7 is mounted to the image forming apparatus
100), the developing chamber 18b is positioned above the developer storage chamber
18a. A developer supplying member (a supplying roller) 20 which comes into contact
with the developing roller 22 and rotates and a developer restricting member (a developing
blade) 21 for restricting a toner layer of the developing roller 22 are arranged in
the developing chamber 18b.
[0030] The developer storage chamber 18a of the developing frame 18 is provided with a stirring
member 23 for stirring stored toner T and transporting the toner to the developer
supplying member 20 via the opening 18c. The stirring member 23 has a rotating shaft
23a extending in a rotational axis direction of the stirring member 23 (a first direction)
and a stirring sheet 23b which is a flexible sheet member having one end attached
to the rotating shaft 23a and which stirs and transports toner. In other words, the
stirring member 23 is configured so as to be rotatable around an axis extending in
the rotational axis direction (a center of the rotating shaft 23a).
[0031] In the present embodiment, a longitudinal direction of the process cartridge 7 and
the axial direction of the developing unit 4 are parallel to the rotational axis direction
of the stirring member 23. In addition, the rotational axis directions of the developing
roller 22, the supplying roller 20, and the photosensitive drum 1 are parallel to
the rotational axis direction of the stirring member 23.
[0032] The stirring member 23 rotates in a direction of an arrow F in a state where a side
of another end of the stirring sheet 23b which is a free end has come into contact
with an inner wall surface of the developer storage chamber 18a and is deflected.
The developer storage chamber 18a has a release position 18e at which the stirring
sheet 23b is released from the deflected state. When passing the release position
18e, the stirring sheet 23b flips up toner present on the stirring sheet 23b due to
a release force from the deflected state and transports the toner to the developer
supplying member 20 inside the developing chamber 18b via the opening 18c. Specifically,
the stirring sheet 23b is configured so as not to come into contact with the inner
wall surface of the developer storage chamber 18a in at least a rotational phase from
the release position 18e to a position opposing the opening 18c in a clockwise direction
in FIG. 5 but capable of coming into contact with the inner wall surface of the developer
storage chamber 18a in other rotational phases. In other words, due to a movement
(a rotation) of the stirring member 23, a distance between the inner wall surface
of the developing frame 18 and the stirring member 23 varies. In the present embodiment,
the stirring sheet 23b comes into contact with the partition portion 18m after passing
the release position 18e. In other words, the partition portion 18m restricts entry
of the stirring member 23 (the stirring sheet 23b) to the developing chamber 18b.
Detailed Configuration of Developer Storage Container
[0033] A detailed configuration of the developing frame 18 which is a developer storage
container will be described with reference to FIGS. 5, 6A, and 6B. FIG. 5 is a schematic
sectional view of the developing frame 18.
[0034] In the present embodiment, as shown in FIG. 5, in addition to the developer storage
chamber 18a, the developing chamber 18b, the opening 18c, and the stirring member
23 described above, the developing frame 18 is provided with a filter 35 which reduces
internal air pressure of the developing chamber 18b at a position opposing the opening
18c of the developing chamber 18b.
[0035] As shown in FIG. 6A, the developing roller 22 and the toner supplying roller 20 are
supported via a first developing bearing unit 32 and a second developing bearing unit
33 with respect to the developing frame 18. The first developing bearing unit 32 is
constituted by the developing roller 22, a developing bearing member 32a for supporting
the toner supplying roller 20, a gear train 32b for transmitting drive to a stirring
gear 30, and a side cover 32c. Two ventilation openings (vent holes) 18g which extend
along an axial line of the developing roller 22 are arranged in parallel at positions
opposing the opening 18c of the developing chamber 18b in the developing frame 18
in order to prevent internal pressure rise of the developing frame 18, and the filter
35 is bonded so as to cover the ventilation openings 18g. The ventilation openings
18g connect the inside of the developing chamber 18b and the outside of the developing
frame 18. In addition, with respect to the axial direction of the stirring member
23, positions of the ventilation openings 18g and a position of the opening 18c overlap
with each other. The filter 35 is formed by a material which restricts passage of
toner but allows passage of air.
[0036] As shown in FIG. 6B, the side cover 32c is fixed to the developing frame 18 and the
developing bearing member 32a by three screws 34 in a state where the side cover 32c
covers a toner cap 31.
[0037] The toner cap 31 seals a toner filling port (not shown) which is provided at a longitudinal
end portion of the developing frame 18 and which is used to fill the developer storage
chamber 18a of the developing frame 18 with toner T during manufacture of the developing
unit 4.
Remanufacturing Method of Process Cartridge
[0038] A remanufacturing method of the process cartridge 7 will be described in detail with
reference to FIGS. 1 and 5 to 12B. FIG. 1 is a schematic sectional view of the developing
frame 18 in a process of refilling toner. FIG. 5 is a schematic sectional view of
the developing frame 18 prior to refilling toner.
[0039] FIG. 7A is a sectional view of the developing frame 18 after boring a hole, and FIG.
7B is a perspective view of the developing frame 18 in an example of a communicating
process of the developing frame 18.
[0040] FIG. 8A is a sectional view of the developing frame 18 after boring a hole, and FIG.
8B is a perspective view of the developing frame 18 in an example of the communicating
process of the developing frame 18.
[0041] FIG. 9 is a sectional view of the developing frame 18 in an example of a process
of refilling toner.
[0042] FIG. 10A is an exploded view of an example of a sealing process for sealing the communication
hole 18f of the developing frame 18, and FIG. 10B is a perspective view of an example
in which the communication hole 18f of the developing frame 18 has been sealed.
[0043] FIG. 11A is an exploded view of an example of the sealing process for sealing the
communication hole 18f of the developing frame 18, and FIG. 11B is a perspective view
of an example in which the communication hole 18f of the developing frame 18 has been
sealed.
[0044] FIG. 12A is an exploded view of an example of the sealing process for sealing the
communication hole 18f of the developing frame 18, and FIG. 12B is a perspective view
of an example in which the communication hole 18f of the developing frame 18 has been
sealed.
[0045] The developing unit 4 according to the present embodiment may sometimes be remanufactured
independently (separated from the photosensitive unit 13) or may sometimes be remanufactured
in an integrated state with the photosensitive unit 13 (in other words, as the process
cartridge 7). In other words, cartridges in the remanufacturing method of a cartridge
according to the present invention may sometimes be the developing unit 4 (a developing
apparatus) having been independently made into a cartridge or may sometimes be the
process cartridge 7 as described in the present embodiment.
[0046] The remanufacturing method of a cartridge according to the present embodiment generally
includes the following three steps:
Step 1: communicating process of the developing frame 18,
Step 2: toner refilling process, and
Step 3: sealing process for sealing a hole of the developing frame 18.
[0047] It should be noted that the remanufacturing method according to the present embodiment
includes a preparing step of preparing a cartridge (the developing unit 4 or the process
cartridge 7) to be a material before performing the steps 1 to 3 described above.
As the developing unit 4 or the process cartridge 7 to be a material, for example,
a used developing unit 4 or a used process cartridge 7 in a state where toner has
been consumed by performing image forming operations is used. In other words, the
remanufacturing method according to the present embodiment is a method of remanufacturing
a new developing unit (a second developing apparatus) from the developing unit 4 (a
first developing apparatus) to be a material. In still other words, the remanufacturing
method according to the present embodiment is a method of remanufacturing a new process
cartridge (a second process cartridge) from the process cartridge 7 (a first process
cartridge) to be a material.
[0048] Hereinafter, each step will be described in sequence.
Step 1: Communicating Process of Developing Frame 18
[0049] The communicating process of the developing frame 18 will be described with reference
to FIGS. 7A, 7B, 8A, and 8B.
[0050] As shown in FIG. 7A, a communication hole (a third opening) 18f for communicating
the developing chamber 18b and the outside of the developing frame 18 is bored at
a position opposing the opening 18c of the developing chamber 18b in the developing
frame 18. The communication hole 18f is bored using an ultrasonic cutter, laser machining,
or the like. In other words, a part of the developing frame 18 is removed to form
the communication hole 18f on the developing frame 18. Due to the communication hole
18f, the developer storage chamber 18a communicates with the outside of the developing
frame 18 via the opening 18c, the developing chamber 18b, and the communication hole
18f. The communication hole 18f is formed so as to open on a wall surface in an upper
part of the developing chamber 18b when the process cartridge 7 is in the posture
when the developing unit 4 being used.
[0051] A shape and a size of the communication hole 18f and a position at which the communication
hole 18f is provided are preferably a shape, a size, and a position which enable a
funnel 36 (to be described later) to be inserted so that a leg portion of the funnel
36 reaches the developer storage chamber 18a. In addition, the shape and the size
of the communication hole 18f are preferably a shape and a size which enable the communication
hole 18f to be closed by a sticker member 37a or a cap member 37b (to be described
later).
[0052] In the example of the communicating process shown in FIGS. 7A and 7B, the communication
hole 18f is formed so as to penetrate the filter 35 and an affixing portion of the
filter 35 in the developing frame 18. In other words, a through-hole is also formed
in the filter 35, and the communication hole 18f is formed by the through-hole of
the filter 35 and an expanded ventilation opening 18g (to be described later). In
the developing frame 18 according to the present embodiment, since a size of the ventilation
opening 18g provided in the affixing portion of the filter 35 is not large enough
to enable the leg portion of the funnel 36 to be inserted thereinto, the communication
hole 18f of a desired size is formed by also partially cutting away a periphery of
the ventilation opening 18g. In other words, it can be argued that the communicating
process includes a process of expanding a size of the ventilation opening 18g as the
communication hole originally provided in the developing frame 18 to a size that enables
the leg portion of the funnel 36 to be inserted thereinto. In the case of a configuration
in which the ventilation opening 18g has a sufficient size, a through-hole may only
be formed in the filter 35 and the communication hole 18f may be formed by the through-hole
of the filter 35 and the ventilation opening 18g. Using the ventilation opening 18g
enables generation of shavings to be suppressed as compared to a case where a new
communication hole 18f is formed in the developing frame 18.
[0053] Alternatively, as in the example of the communicating process shown in FIG. 8A, at
least a part of the filter 35 may be peeled away from the developing frame 18 to form
the communication hole 18f. In other words, a removing process of peeling the filter
35 away from the developing frame 18 is first performed and, subsequently, a process
of boring the communication hole 18f with a desired size in the developing frame 18
is performed. A peripheral portion of the ventilation opening 18g is partially cut
away when forming the communication hole 18f in a similar manner to the example shown
in FIGS. 7A and 7B described above. In the case of a configuration in which the ventilation
opening 18g has a sufficient size, the communicating process may be completed by only
an action of peeling the filter 35 away from the developing frame 18. In other words,
in the communicating process, the ventilation opening 18g may be used as the communication
hole 18f without removing a part of the developing frame 18. Accordingly, work for
removing a part of the developing frame 18 can be omitted and generation of shavings
can be suppressed. It should be noted that, as shown in FIG. 8B, the communication
hole 18f may be formed by connecting a plurality of ventilation openings 18g. Expanding
the ventilation opening 18g or connecting a plurality of ventilation openings 18g
can also improve degassing performance of the ventilation opening 18g. Even in this
case, it can be argued that the ventilation opening 18g is being expanded.
[0054] The communicating process of the developing frame 18 is not limited to the methods
described above. Other methods can be appropriately adopted as long as a communication
hole which establishes communication between the developer storage chamber 18a and
the outside of the developing frame 18 and which enables an introduction path of refill
toner to be secured during toner refill (to be described later) can be formed in the
developing frame 18.
Step 2: Toner Refilling Process
[0055] The toner refilling process of filling the developing frame 18 with new toner will
be described with reference to FIGS. 1 and 9.
[0056] FIG. 1 is a schematic sectional view showing a situation where toner refill is performed
with respect to the developing frame 18 in which the communication hole 18f has been
formed so as to penetrate the filter 35 and the affixing portion of the filter 35
in the developing frame 18 by the communicating process shown in FIGS. 7A and 7B.
Toner refill to the developer storage chamber 18a is performed by inserting the funnel
36 into the communication hole 18f and pouring toner T into the funnel 36 from a toner
bottle (not shown) or the like. The funnel 36 has a conical portion 36a for receiving
the toner T poured from the toner bottle and a tubular leg portion 36b which extends
from a small-diameter leading end portion of the conical portion 36a, and the funnel
36 is inserted into the developing frame 18 to a position where an opening leading
end portion 36c of the leg portion 36b reaches the developer storage chamber 18a.
In the present embodiment, with respect to the axial direction of the stirring member
23, positions of the ventilation openings 18g and the position of the opening 18c
overlap with each other. Therefore, the opening leading end portion 36c of the leg
portion 36b can be readily inserted to a position where the opening leading end portion
36c reaches the developer storage chamber 18a. Accordingly, a refill introduction
path of the toner T is formed which reaches the developer storage chamber 18a from
the outside of the developing frame 18 via the communication hole 18f, the developing
chamber 18b, and the opening 18c. While the toner T can also be refilled from other
portions, filling the developer storage chamber 18a with the toner T from the communication
hole 18f which is proximal to the developer storage chamber 18a makes it easier for
the toner to enter the developer storage chamber 18a.
[0057] FIG. 9 is a schematic sectional view showing a situation where toner refill is performed
with respect to the developing frame 18 in which the communication hole 18f has been
formed by peeling away the filter 35 according to the communicating process shown
in FIGS. 8A and 8B. As shown in FIG. 9, toner refill to the developer storage chamber
18a is performed by peeling away the filter 35, inserting the funnel 36 into the formed
communication hole 18f, and pouring toner into the funnel 36 from a toner bottle (not
shown) or the like.
[0058] It should be noted that toner refill is not limited to methods using the funnel 36
described above as a tool for refilling the developer storage chamber 18a with the
toner T. For example, a method may be adopted in which refill is performed by inserting
a tubular portion of a dispenser or a hose-like tubular member being connected to
a toner supply source.
[0059] Refill need not necessary involve directly filling the developer storage chamber
18a with toner. In other words, the developing chamber 18b may be filled with toner
from the outside of the developing frame 18 via the communication hole 18f. In doing
so, the stirring member 23 is preferably moved so as not to cover the opening 18c.
Accordingly, the developer storage chamber 18a can be filled with the toner having
filled the developing chamber 18b through the opening 18c.
Step 3: Sealing Process for Sealing Hole of Developing Frame 18
[0060] The sealing process for sealing the communication hole 18f of the developing frame
18 will be described with reference to FIGS. 10A, 10B, 11A, 11B, 12A, and 12B.
[0061] In the sealing process according to the present embodiment, the communication hole
18f can be sealed using various sealing members 37.
[0062] As shown in FIG. 10A, the sticker member 37a may be used as the sealing member 37.
An adhesive surface of the sticker member 37a is attached to the filter 35 at a position
where the communication hole 18f is to be sealed to provide a seal so that toner T
does not leak from the communication hole 18f.
[0063] Alternatively, as shown in FIG. 11A, the cap member 37b may be used as the sealing
member 37. After attaching the cap member 37b to the filter 35 so as to close the
communication hole 18f, an adhesive member 38 is injected to bonding surfaces of the
cap member 37b and the filter 35 or the adhesive member 38 is applied to the bonding
surfaces in advance, and the cap member 37b and the filter 35 are bonded to each other.
Bonding methods are not limited and a pressure sensitive adhesive or a silicone bond
may be used.
[0064] Alternatively, as shown in FIG. 12A, the filter 35 may be replaced with a new filter
37c and the new filter 37c may be attached to the developing frame 18 so as to cover
the communication hole 18f (the ventilation opening 18g). In doing so, the filter
35 may be reused. In the communicating process shown in FIGS. 8A and 8B, the filter
35 is peeled away, the communication hole 18f is formed and, after refill, the new
filter 37c is attached and the new filter 37c and the developing frame 18 are bonded
to each other. Bonding methods are not limited and heat-welding or a double-sided
tape may be used.
Advantages of Present Embodiment
[0065] As described above, with steps 1 to 3 described above, a remanufacturing method of
a cartridge which prevents work from being disturbed by a stirring member of the cartridge
can be provided.
[0066] Specifically, the communication hole 18f is formed so as to open to the developing
chamber 18b which is partitioned by the partition portion 18m with respect to the
developer storage chamber 18a in which the stirring member 23 is stored. Accordingly,
the stirring member 23 is prevented from closing the communication hole 18f. In other
words, work for filling the inside of the developing frame 18 with toner from the
outside of the developing frame 18 is not impeded by the stirring member 23. In addition,
even in cases where a part of the developing frame 18 is removed in the process of
forming the communication hole 18f or expanding the communication hole 18f (the ventilation
opening 18g), the stirring member 23 is prevented from being damaged. Therefore, there
is no need to move the stirring member 23 in order to prevent damage to the stirring
member 23. In other words, work for removing a part of the developing frame 18 is
not impeded by the stirring member 23.
[0067] In addition, with the remanufacturing method of a cartridge according to the present
embodiment, the communication hole 18f (the ventilation opening 18g) opens in a direction
(a second direction) that intersects with a direction of the rotational axis of the
stirring member 23. Therefore, an insertion direction of the funnel 36 is a direction
that approximately matches a direction in which the stirring sheet 23b is likely to
exhibit flexibility. While the funnel 36 and the stirring sheet 23b preferably do
not come into contact with each other, even when the funnel 36 and the stirring sheet
23b come into contact with each other, since the contact occurs in a direction in
which the stirring sheet 23b is likely to exhibit flexibility, the stirring sheet
23b is less likely to be damaged. Furthermore, even when the stirring sheet 23b stops
at a position where the stirring sheet 23b closes the opening 18c between the developer
storage chamber 18a and the developing chamber 18b, the leg portion 36b of the funnel
36 can be inserted to the developer storage chamber 18a by utilizing the flexibility
of the stirring sheet 23b and causing the stirring sheet 23b to deflect (by pushing
back the stirring sheet 23b). As described above, since the stirring sheet 23b is
in a released state where the stirring sheet 23b is not in contact with the inner
wall surface of the developer storage chamber 18a at the position where the stirring
sheet 23b closes the opening 18c, it is not difficult to push the leg portion 36b
of the funnel 36 into the communication hole 18f and cause the stirring sheet 23b
to deform so as not to damage the stirring sheet 23b.
Second Embodiment
[0068] A remanufacturing method of the process cartridge 7 according to a second embodiment
will now be described in detail with reference to FIG. 13. In the second embodiment,
descriptions of matters in common with those of the first embodiment will be generally
omitted.
[0069] FIG. 13 is an explanatory diagram of a communicating process according to the second
embodiment. The second embodiment differs from the first embodiment in an arrangement
of the ventilation opening 18g and an arrangement of the communication hole 18f.
[0070] An arrow in FIG. 13 indicates a longitudinal direction of the process cartridge 7
(a rotational axis direction of the developing roller 22). As shown in FIG. 13, the
developing frame 18 according to the second embodiment includes a plurality of ventilation
openings 18g. It should be noted that the ventilation openings 18g according to the
second embodiment are arranged at positions opposing the opening 18c in a similar
manner to the first embodiment (refer to FIGS. 5, 6A, and 6B). In addition, the ventilation
openings 18g are covered by the filter 35 in a similar manner to the first embodiment.
[0071] The plurality of the ventilation openings 18g include a plurality of first ventilation
openings 18g1 and a plurality of second ventilation openings 18g2. In a direction
perpendicular to the rotational axis direction of the developing roller 22, positions
of the first ventilation openings 18g1 and positions of the second ventilation openings
18g2 differ from and do not overlap with each other. In the rotational axis direction
of the developing roller 22, the positions of the first ventilation openings 18g1
and the positions of the second ventilation openings 18g2 differ from each other.
However, the positions of at least a part of the first ventilation openings 18g1 and
the positions of at least a part of the second ventilation openings 18g2 overlap with
each other.
[0072] The communication hole 18f is formed so as to connect the first ventilation openings
18g1 and the second ventilation openings 18g2. In doing so, the communication hole
18f can be formed so as to connect one first ventilation opening 18g1 and one second
ventilation opening 18g2 (18f1). In addition, the communication hole 18f can also
be formed so as to connect one first ventilation opening 18g1 and a plurality of the
second ventilation openings 18g2 (18f2). The communication hole 18f can also be formed
so as to connect a plurality of the first ventilation openings 18g1 and a plurality
of the second ventilation openings 18g2. Furthermore, a plurality of communication
holes 18f can be formed in the developing frame 18. For example, a communication hole
denoted by 18f1 and a communication hole denoted by 18f2 can be formed in the developing
frame 18. Alternatively, any one of a communication hole denoted by 18f1 and a communication
hole denoted by 18f2 can be formed in the developing frame 18. In doing so, in order
to form the communication hole 18f, a part of the developing frame 18 positioned between
the respective ventilation openings 18g is removed.
[0073] According to the arrangement of the ventilation openings 18g (the plurality of first
ventilation openings 18g1 and the plurality of second ventilation openings 18g2) described
in the present embodiment, the communication hole 18f can be readily formed. In addition,
by increasing the number of ventilation openings 18g which become connected by forming
the communication hole 18f, the communication hole 18f can be readily expanded. Accordingly,
the degassing performance of the ventilation openings 18g can also be improved.
[0074] Since the refilling process of toner and the sealing process of sealing the communication
hole 18f are the same as those of the first embodiment, descriptions thereof will
be omitted. In other words, in the same manner as in the first embodiment, the communication
hole 18f (the ventilation openings 18g) can be sealed by a sealing member such as
the filter 35, the new filter 37c, or the cap member 37b.
[0075] According to the present invention, a cartridge can be remanufactured while preventing
work from being disturbed by a stirring member of the cartridge.
[0076] 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.
[0077] A remanufacturing method of a developing apparatus including: a communicating step
of removing a part of a frame of the developing apparatus to form a communication
hole such that an outside of the frame and a developing chamber of the frame are connected
each other; a refilling step of refilling an inside of the frame with developer via
the communication hole; and a sealing step of sealing the communication hole.
1. A remanufacturing method for remanufacturing a developing apparatus,
the developing apparatus including:
a frame having a storage chamber for storing a developer, a developing chamber in
which a developer bearing member for bearing the developer is to be arranged, and
a partition portion that partitions the storage chamber and the developing chamber,
the frame being provided with an opening in the partition portion such that the storage
chamber and the developing chamber are connected each other; and
a stirring member for stirring the developer, the stirring member being arranged in
the storage chamber so as to be capable of coming into contact with a wall surface
of the frame that forms the storage chamber,
the remanufacturing method comprising:
a communicating step of removing a part of the frame to form a communication hole
such that an outside of the frame and the developing chamber are connected each other;
a refilling step of refilling an inside of the frame with the developer via the communication
hole; and
a sealing step of sealing the communication hole.
2. The remanufacturing method according to claim 1, wherein
the developing apparatus includes the frame provided with a ventilation opening which
connects an outside of the frame and the developing chamber each other, and a filter
which is attached to the frame so as to cover the ventilation opening.
3. The remanufacturing method according to claim 2, comprising a step of exposing the
ventilation opening to the outside of the frame by peeling away at least a part of
the filter from the frame.
4. The remanufacturing method according to claim 3, wherein in the sealing step, the
filter peeled away from the frame or a new filter is attached to the frame so as to
cover the ventilation opening.
5. The remanufacturing method according to claim 2, wherein
the communicating step includes a step of forming a through-hole in the filter, and
the communication hole includes the ventilation opening and the through-hole.
6. The remanufacturing method according to claim 5, wherein in the sealing step, a sealing
member for closing the through-hole is bonded to the filter.
7. The remanufacturing method according to any one of claims 2 to 6, wherein the communicating
step includes a step of expanding a size of the ventilation opening.
8. The remanufacturing method according to claim 7, wherein
the frame is provided with a plurality of the ventilation openings, and
the communicating step includes a step of connecting the plurality of the ventilation
openings.
9. A remanufacturing method for remanufacturing a developing apparatus,
the developing apparatus including:
a frame having a storage chamber for storing a developer, a developing chamber in
which a developer bearing member for bearing the developer is to be arranged, and
a partition portion that partitions the storage chamber and the developing chamber,
the frame being provided with an opening in the partition portion such that the storage
chamber and the developing chamber are connected each other; and
a stirring member for stirring the developer, the stirring member being arranged in
the storage chamber so as to be capable of coming into contact with a wall surface
of the frame that forms the storage chamber,
the frame being provided with a ventilation opening which connects an outside of the
frame and the developing chamber each other, and a filter which is attached to the
frame so as to cover the ventilation opening,
the remanufacturing method comprising:
a communicating step of forming a communication hole which connects the outside of
the frame and the developing chamber each other by peeling away at least a part of
the filter from the frame;
a refilling step of refilling an inside of the frame with the developer; and
a sealing step of sealing the communication hole.
10. The remanufacturing method according to claim 9, wherein in the sealing step, the
filter peeled away from the frame or a new filter is attached to the frame so as to
cover the ventilation opening.
11. The remanufacturing method according to claim 9 or 10, wherein
the communicating step includes a step of forming a through-hole in the filter, and
the communication hole includes the ventilation opening and the through-hole.
12. The remanufacturing method according to claim 11, wherein in the sealing step, a sealing
member for closing the through-hole is bonded to the filter.
13. The remanufacturing method according to any one of claims 9 to 12, wherein the communicating
step includes a step of expanding a size of the ventilation opening.
14. The remanufacturing method according to claim 9 to 13, wherein
the frame is provided with a plurality of the ventilation openings, and
the communicating step includes a step of connecting the plurality of the ventilation
openings.
15. The remanufacturing method according to any one of claims 1 to 14, wherein the communication
hole is arranged at a position opposing the opening.
16. The remanufacturing method according to any one of claims 1 to 15, wherein the partition
portion is configured to restrict entry of the stirring member into the developing
chamber.
17. The remanufacturing method according to any one of claims 1 to 16, wherein in the
refilling step, the storage chamber is filled with the developer via the communication
hole and the opening.
18. The remanufacturing method according to any one of claims 1 to 17, wherein the stirring
member has a rotating shaft and a sheet member in which one end of the sheet member
is fixed to the rotating shaft and another end is capable of coming into contact with
the wall surface.
19. The remanufacturing method according to any one of claims 1 to 18, wherein when the
developing apparatus is in an posture when the developing apparatus being used, the
developing chamber is positioned above the storage chamber and the communication hole
is positioned on a wall surface in an upper part of the developing chamber.
20. A cartridge that is attachable to and detachable from an image forming apparatus,
the cartridge comprising:
a developing apparatus remanufactured by the remanufacturing method according to any
one of claims 1 to 19; and
a restricting member for restricting the developer borne by the developer bearing
member.