JP7242917B2 - developing device - Google Patents

Description

The present invention relates to a developing device suitable for use in image forming apparatuses using electrophotographic technology, such as printers, copiers, facsimiles, and multi-function machines.

Image forming apparatuses using electrophotographic technology, such as printers, copiers, facsimiles, and multi-function machines, include a developing device that develops an electrostatic latent image formed on a photosensitive drum with a developer to make it visible. It is detachably provided with respect to In the developing device for replacement, the new developer is stored in advance in a storage section whose opening is sealed with a sealing sheet so that the new developer does not deteriorate due to contact with the outside air. Therefore, when a replacement developing device is mounted, it is necessary to pull out the sealing sheet to unseal the accommodating portion and allow the developer to flow out of the accommodating portion. A conveying screw capable of conveying the developer flowed out from the container is provided in the developer container, and the sealing sheet is pulled out in the rotation axis direction of the conveying screw. Further, in order to allow the sealing sheet to be pulled out of the developer container substantially parallel and to discharge the pulled-out sealing sheet out of the developer container, the conveying screw is provided on the extension line of the opening of the container or from the opening. A sheet discharge port is formed on the near lower side (Patent Document 1).

JP 2010-48944 A

By the way, when the conveying screw is rotated after the sealing sheet is pulled out, the developer scatters in the developing container as the conveying screw rotates, and the scattered developer is likely to be discharged out of the developing container from the sheet discharge port. Become. In order to prevent this, it is conceivable to move the sheet discharge port away from the conveying screw in the rotation axis direction of the conveying screw. It is also conceivable to seal the sheet discharge port with an elastic sealing member and increase the elasticity of this sealing member. However, in such a case, the pulling force for pulling out the encapsulating sheet becomes too large, and in some cases, the encapsulating sheet is cut while being pulled out, forcing the developing device to be replaced again. rice field. In view of these, the developer is pre-stored in a storage portion sealed with a sealing sheet, and the developer is discharged out of the developing container from the sheet discharge port after the sealing sheet is pulled out as the conveying screw rotates. Conventionally, there has been a demand for a developing device that is less likely to be discharged to the outside. However, no such proposal has been made yet.

The present invention has been made in view of the above problems. SUMMARY OF THE INVENTION An object of the present invention is to provide a developing device capable of improving operability when a user pulls out a sealing sheet through a discharge section.

A developing device according to the present invention includes: a developing rotary member for carrying and conveying a developer containing toner and carrier at a position for developing an electrostatic latent image formed on an image carrier; a first chamber for supplying the developer to the rotating body; a second chamber partitioned from the first chamber by a partition wall and in which the developer circulates between the first chamber; and a vertical direction upper side of the second chamber. a developing container having an accommodating chamber having an opening and accommodating an initial developer disposed in the first chamber; a first conveying screw disposed in the first chamber for conveying the developer in the first direction; a second conveying screw arranged in a second chamber for conveying the developer in a second direction opposite to the first direction; and a seal for sealing the opening for accommodating the initial developer in the accommodating chamber a sealing sheet, a sticking portion provided in the storage chamber to which the sealing sheet is stuck, and a discharge portion for discharging the sealing sheet from the inside of the developing container to the outside of the developing container. , the side wall portion of the developing container has a through-hole through which the rotating shaft of the second conveying screw penetrates, and the sealing sheet stuck to the sticking portion is passed through the discharging portion to the developer container. By discharging from the inside of the container to the outside of the developing container, the initial developer contained in the storage chamber can move from the storage chamber to the second chamber through the opening, and the discharge portion is disposed upstream of the opening in the second direction and vertically above the opening, and is formed on a wall surface of the developer container that intersects the side wall . Characterized by

ADVANTAGE OF THE INVENTION According to this invention, the operability at the time of a user pulling out a sealing sheet via a discharge part can be improved .

1 is a schematic diagram showing the configuration of an image forming apparatus suitable for using the developing device of the present embodiment; FIG. FIG. 2 is a cross-sectional view showing the developing device of the first embodiment; FIG. 2 is a cross-sectional view showing the developing device of the first embodiment as seen in a vertical cross section including the axial direction; FIG. 2 is an enlarged cross-sectional perspective view showing the vicinity of a sheet discharge port of the developing device according to the first embodiment; FIG. 5 is a cross-sectional view showing the developing device of the second embodiment as seen in a vertical cross section including the axial direction; FIG. 10 is an enlarged cross-sectional perspective view showing the vicinity of the sheet discharge port of the developing device according to the second embodiment;

<First Embodiment>
[Image forming apparatus]
A first embodiment will be described below. First, the configuration of an image forming apparatus suitable for using the developing device of this embodiment will be described with reference to FIG. The image forming apparatus 60 shown in FIG. 1 is an intermediate transfer tandem type color image forming apparatus in which four-color image forming units 600 are arranged inside the apparatus body 100 so as to face an intermediate transfer belt 61 .

A recording material conveying process of the image forming apparatus 60 will be described. The recording materials S are stacked in a recording material container (cassette) 62 and fed by a paper feed roller 63 in accordance with image formation timing. Paper is fed from the recording material storage box 62 by, for example, a friction separation method. The recording material S sent out by the paper feed roller 63 is conveyed to the registration roller 65 arranged in the middle of the conveying path 64 . After skew correction and timing correction of the recording material S are performed by the registration rollers 65, the recording material S is sent to the secondary transfer portion T2. The secondary transfer portion T2 is a transfer nip formed by a secondary transfer inner roller 66 and a secondary transfer outer roller 67 facing each other. to attract the toner image.

A process of forming an image sent to the secondary transfer portion T2 at the same timing as the above-described process of conveying the recording material S to the secondary transfer portion T2 will be described. First, the image forming section 600 will be described. However, since the image forming units 600 for each color are basically the same except for the color of the toner, only the image forming units 600 for black (BK) are denoted by reference numerals in FIG. Not marked. Therefore, the black (BK) image forming unit 600 will be described below as a representative example.

The image forming unit 600 mainly includes a photosensitive drum 1, a charging device 2, a developing device 3, a photosensitive drum cleaner 5, and the like. The surface of the rotationally driven photosensitive drum 1 is uniformly charged in advance by the charging device 2, and then an electrostatic latent image is formed by the exposure device 68 driven based on the image information signal. Next, the electrostatic latent image formed on the photosensitive drum 1 is visualized through toner development by the developing device 3 . That is, the developing device 3 develops the electrostatic latent image with toner contained in a developer, which will be described later, to form a toner image on the photosensitive drum 1 . The developing device 3 will be described later (see FIG. 2).

After that, a predetermined pressure and an electrostatic load bias are applied by the primary transfer device 4 arranged opposite to the image forming section 600 with the intermediate transfer belt 61 interposed therebetween, and the toner image formed on the photosensitive drum 1 is transferred to the intermediate transfer belt 61 . It is primarily transferred onto the transfer belt 61 . The primary transfer residual toner remaining on the photosensitive drum 1 after the primary transfer is collected by the photosensitive drum cleaner 5 to prepare for the next image forming process.

In this embodiment, the image forming units 600 have four sets of yellow (Y), magenta (M), cyan (C), and black (BK). However, the number of colors is not limited to four colors, and the arrangement order of colors is not limited to this. The developing device 3 uses a two-component developer containing non-magnetic toner and magnetic carrier as the developer. In this case, since toner is consumed during development, toner can be replenished to the developing device 3 from a toner bottle 605 containing toner.

The intermediate transfer belt 61 onto which the toner image is primarily transferred is an endless belt that is stretched by the tension roller 6, the inner secondary transfer roller 66, and the driven rollers 7a and 7b and moves in the direction of arrow C in the figure. In this embodiment, the inner secondary transfer roller 66 also serves as a drive roller that drives the intermediate transfer belt 61 . The image forming processes of the respective colors, which are processed in parallel by the image forming units 600 of the respective colors described above, are performed at the timing of sequentially superimposing them on the toner images of the colors primarily transferred onto the intermediate transfer belt 61 upstream in the movement direction. As a result, a full-color toner image is finally formed on the intermediate transfer belt 61 and conveyed to the secondary transfer portion T2. The secondary transfer residual toner remaining on the intermediate transfer belt 61 after passing through the secondary transfer portion T2 is collected from the intermediate transfer belt 61 by the transfer cleaner device 8 .

With the conveying process and the image forming process described above, the timing of the recording material S and the full-color toner image coincide at the secondary transfer portion T2, and the toner image is transferred from the intermediate transfer belt 61 to the recording material S. A secondary transfer takes place. After that, the recording material S is conveyed to the fixing device 9 , and the toner image is melted and fixed on the recording material S by being pressurized and heated by the fixing device 9 . The recording material S on which the image has been fixed in this manner is discharged as it is onto the paper discharge tray 601 by the forward rotation of the paper discharge roller 69, or a selection is made as to whether to perform double-sided image formation.

When double-sided image formation is required, the discharge roller 69 is rotated forward to transport the recording material S until the trailing edge passes through the switching member 602, and then the discharge roller 69 is reversely rotated to switch the leading and trailing edges. , is conveyed to the double-sided conveying path 603 . After that, it is sent to the conveying path 64 again by the re-feeding roller 604 in synchronism with the recording material of the succeeding job conveyed by the feeding roller 63 . The subsequent transportation and the image forming process on the back side are the same as those described above, so the description is omitted.

[Developing device]
Next, the developing device 3 of the first embodiment will be described using FIGS. 2 and 4 while referring to FIG. 1. FIG. Note that a sheet discharge port 80, which will be described later, is indicated by a dotted line in FIG. 2 for easy understanding of the description. The developing device 3 of this embodiment has a developing container 30 forming a housing, a developing sleeve 17, a developing screw 33, a stirring screw 34, and a regulating blade 36, as shown in FIG.

The developer container 30 contains a two-component developer containing non-magnetic toner and magnetic carrier (hereinafter simply referred to as developer). That is, the developing device 3 of the present embodiment employs a two-component developing method as a developing method, and uses a developer in which negatively charged non-magnetic toner and positively charged magnetic carrier are mixed. The non-magnetic toner is obtained by encapsulating a colorant, an external additive such as colloidal silica fine powder, wax, etc. in a resin such as polyester or styrene acrylic, and pulverizing or polymerizing the resin into a powder. The magnetic carrier is obtained by applying a resin coating to the surface layer of a core made of resin particles kneaded with ferrite particles or magnetic powder. Note that the toner concentration (ratio of toner weight to total weight of toner and carrier) of a new developer (so-called initial state) is, for example, 10%.

A portion of the developer container 30 facing the photosensitive drum 1 is open, and a developing sleeve 17 capable of carrying the developer is rotatably provided so as to be partially exposed in the opening. A developing sleeve 17 as a developer bearing member is formed in a cylindrical shape from a non-magnetic material such as aluminum or stainless steel, and is rotated in the same direction as the photosensitive drum 1 on the surface facing the photosensitive drum 1 (arrow R2 in the figure). , arrow R3). The rotation direction of the developing sleeve 17 may be the opposite direction to the photosensitive drum 1 on the surface facing the photosensitive drum 1 .

A magnet roller 18 is fixedly arranged inside the developing sleeve 17 . The magnetic force of the magnet roller 18 forms magnetic brushes of the developer on the surface of the developing sleeve 17 . The magnetic brush formed on the surface of the developing sleeve 17 is regulated in layer thickness by the regulating blade 36 and sent to a predetermined development area. The regulating blade 36 is a plate-like member made of a non-magnetic material such as aluminum, and is arranged along the rotation axis direction (longitudinal direction) of the developing sleeve 17 . The electrostatic latent image formed on the photosensitive drum 1 is developed into a toner image by the magnetic brushes sent to the developing area rubbing the photosensitive drum 1 . At that time, a DC voltage alone or a superimposed voltage of a DC voltage and an AC voltage is applied to the developing sleeve 17 by a power source (not shown) as a developing voltage.

The developing container 30 is partitioned into a developing chamber 31 and an agitation chamber 32 by a partition wall 39 extending in the vertical direction in the drawing at a substantially central portion. The developing chamber 31 and the stirring chamber 32 communicate with each other through communicating portions provided at both longitudinal ends of the partition wall 39 to form a developer circulation path. A developing screw 33 and a stirring screw 34 are rotatably disposed in the developing chamber 31 and the stirring chamber 32, respectively. The developing screw 33 and the stirring screw 34 are screws each having blades (not shown) spirally provided around rotation shafts 33a and 34a.

The developing sleeve 17, the developing screw 33, and the stirring screw 34 are connected by a gear train, and rotated by a drive motor (not shown) via this gear train. When the developing screw 33 rotates, the developer in the developing chamber 31 is conveyed along the developing screw 33 , and part of the developer is supplied to the developing sleeve 17 at this time. The developer conveyed in the developing chamber 31 is transferred from the developing chamber 31 to the stirring chamber 32 through a communicating portion on one end side of the partition wall 39 which is downstream of the developing screw 33 in the developer conveying direction. On the other hand, when the stirring screw 34 rotates, the developer in the stirring chamber 32 is conveyed along the stirring screw 34 in the direction opposite to the developer conveying direction of the developing screw 33 . The developer conveyed in the stirring chamber 32 is transferred from the stirring chamber 32 to the developing chamber 31 through the communicating portion on the other end side of the partition wall 39 which is the upstream side of the developing screw 33 in the developer conveying direction. In this way, the developer is circulated and transported in the developing container 30 (inside the developing container) while being stirred by the developing screw 33 and the stirring screw 34 .

[Accommodating part and sealing sheet]
Incidentally, in this embodiment, in order to improve convenience, the developing device 3 for each color is provided detachably with respect to the apparatus main body 100 (see FIG. 1). In the replacement developing device 3, a new developer (also called an initial state) that has not yet been subjected to development is preliminarily enclosed in a developer container 30 so as not to deteriorate due to contact with the outside air. In the present embodiment, as shown in FIG. 2, above a stirring screw 34 as a conveying screw in the developer container 30, an accommodating portion 35 capable of accommodating a new developer in advance is formed.

As shown in FIGS. 3 and 4, the storage portion 35 as the first chamber has a space above the stirring screw 34 (above the conveying screw) in the developing container 30, and the wall portion 35b extends in the rotation axis direction of the stirring screw 34 ( longitudinal direction). Further, the wall portion 35b forms a space portion 32a as a second chamber in addition to the housing portion 35. As shown in FIG. In the case of the present embodiment, the accommodation portion 35 and the space portion 32 a are horizontally opened on the side of the stirring screw 34 (the side of the conveying screw) and communicate with the stirring chamber 32 . In order to efficiently transport the developer after the sealing sheet 37 (to be described later) is pulled out, the housing portion 35 is formed with blades (not shown) of the stirring screw 34 in the rotation axis direction of the stirring screw 34. It is preferably formed over substantially the entire range.

A sealing sheet 37 can be attached to the opening 35 a of the storage section 35 , and the sealing sheet 37 can seal the opening 35 a while the developer is stored in the storage section 35 . The sealing sheet 37 is a sheet member made of a resin material such as a plastic film, and is detachably attached to the opening 35a by an appropriate method such as thermal welding or adhesive. Thus, the containing portion 35 can be sealed with the sealing sheet 37 while containing a new developer.

In the replacement developing device 3, while a new developer is stored in advance in the storage portion 35 sealed with the sealing sheet 37 as described above, the development chamber 31 and the stirring chamber 32 (including the space portion 32a) are stored in advance. ) contains no developer. Therefore, when mounting a replacement developing device 3, the sealing sheet 37 must be removed. The sealing sheet 37 is removed, and the developer stored in the storage unit 35 drops into the stirring chamber 32 having the stirring screw 34 and is conveyed as the stirring screw 34 (and the developing screw 33) rotates. The new developer spreads throughout the developer container 30 . In the case of this embodiment, the sealing sheet 37 is pulled out from outside the developer container 30 (outside the developer container) in the rotation axis direction (longitudinal direction) of the stirring screw 34 .

As shown in FIG. 4, a sheet discharge port 80 is formed in the developer container 30 so that the sealing sheet 37 can be pulled out in the longitudinal direction. In this embodiment, since the sealing sheet 37 is pulled out in the direction of the rotation axis of the stirring screw 34, the sheet discharge port 80 is provided with a bearing (not shown) that rotatably supports the stirring screw 34. is formed on the side wall portion 30a of the . Specifically, the sheet discharge port 80 is formed in the side wall portion 30a opposite to the wall portion 35b across the space portion 32a.

The sealing sheet 37 is inserted into the sheet outlet 80 so that one end (a free end portion 37 b described later) that is not attached to the opening 35 a protrudes outside the developing container 30 . Since one end side of the sealing sheet 37 protrudes out of the developer container 30 through the sheet discharge port 80 , the sealing sheet 37 can be pulled out from the developer container 30 . Then, when the sealing sheet 37 is pulled out, it can be discharged out of the developer container 30 while being guided by the sheet discharge port 80 .

In this embodiment, the sheet discharge port 80 is formed above the opening 35a when viewed in the horizontal direction. In this way, the sheet discharge port 80 can be separated from the stirring screw 34 in the radial direction of the stirring screw 34 , and the developer flows from the sheet discharge port 80 after the sealing sheet 37 is pulled out as the stirring screw 34 rotates. It becomes difficult to discharge to the outside of the container 30 .

The sheet discharge port 80 is inclined at a predetermined angle with respect to the horizontal direction. The predetermined angle (see angle θ in FIG. 4) is preferably 30 degrees or more and less than 90 degrees with respect to the horizontal direction. By inclining the sheet discharge port 80, the upper end side of the sheet discharge port 80 is separated from the stirring screw 34 in the radial direction of the stirring screw 34 more than the lower end side. In this case, compared to the case where the sheet discharge port 80 is not inclined (θ=0), the developer flows out of the developer container 30 from the sheet discharge port 80 after the sealing sheet 37 is pulled out as the stirring screw 34 rotates. can make it more difficult to be expelled into the body.

Further, as shown in FIG. 2, when the wall surface 30c of the developing container 30 on the side opposite to the developing sleeve 17 in the width direction intersecting the rotation axis direction of the stirring screw 34 is formed to be inclined with respect to the vertical direction. , the sheet discharge port 80 can be inclined according to the wall surface 30c. That is, the sheet discharge port 80 is inclined with respect to the vertical direction at the same inclination angle as the wall surface 30c. In this case, the sheet discharge port 80 may be formed so that at least a portion thereof overlaps with the wall portion 35b when viewed from the rotation axis direction of the stirring screw 34 . By doing so, the developer is less likely to be discharged out of the developer container 30 as the stirring screw 34 rotates from the sheet discharge port 80 after the sealing sheet 37 is pulled out without increasing the size of the apparatus.

As shown in FIG. 4, the sealing sheet 37 attached to the opening 35a is folded and projected out of the developer container 30 through the sheet discharge port 80. As shown in FIG. That is, the sealing sheet 37 has a sealing portion 37a that seals the opening 35a and a free end portion 37b that protrudes out of the developer container 30 from the sheet discharge port 80 and is connected by a bent portion 37c. The bent portion 37c changes the positions in which the sealing portion 37a and the free end portion 37b face in the space portion 32a, so that the pulling force is appropriately transmitted from the free end portion 37b to the sealing portion 37a during the pulling operation. The stopping sheet 37 is easily discharged from the sheet discharge port 80.例文帳に追加If the sheet discharge port 80 is formed above the opening 35a when viewed from the horizontal direction, the sealing sheet 37 must be folded. Therefore, in the present embodiment, the accommodating portion 35 and the space portion 32a are formed by the wall portion 35b so as to secure the space portion 32a for accommodating the bent portion 37c. In other words, by securing the space 32a with the wall 35b, the sheet discharge port 80 can be formed above the opening 35a when viewed in the horizontal direction.

As shown in FIG. 4, the sheet discharge port 80 may be provided with a seal member 40 made of an elastic material such as urethane material. The sealing member 40 is provided so as to be able to pass through the sealing sheet 37 while filling the gap of the sheet discharge port 80 .

As described above, in the present embodiment, the sheet discharge port 80 is formed above the opening 35a when viewed in the horizontal direction, so that the sheet discharge port 80 is separated from the stirring screw 34 in the radial direction of the stirring screw 34. be able to. In addition, by inclining the sheet discharge port 80 at a predetermined angle with respect to the horizontal direction, the sheet discharge port 80 can be further separated from the stirring screw 34 in the radial direction of the stirring screw 34 . By doing so, it can be easily realized that the developer is more difficult to be discharged out of the developer container 30 as the stirring screw 34 rotates from the sheet discharge port 80 after the sealing sheet 37 is pulled out.

<Second embodiment>
A developing device 3A of the second embodiment will be described with reference to FIGS. 5 and 6. FIG. The developing device 3A of the second embodiment differs from the developing device 3 of the first embodiment described above (see FIGS. 3 and 4) only in that it has a discharge port wall 41 protruding into the developer container 30. and other configurations are the same. Therefore, in the developing device 3A of the second embodiment, the same components as those of the developing device 3 of the first embodiment are denoted by the same reference numerals, and descriptions thereof are omitted.

In this embodiment, a discharge port wall 41 is formed inside the developer container 30 as a projecting portion so as to surround the sheet discharge port 80 . That is, the developer container 30 has a discharge port wall 41 projecting inward from the side wall portion 30a. The discharge port wall 41 can reduce the flow of the developer scattered inside the developer container 30 along with the rotation of the stirring screw 34 after the sealing sheet 37 is pulled out into the sheet discharge port 80 . Therefore, the elasticity of the seal member 40 (see FIG. 4) can be reduced, or the seal member 40 can be omitted. By doing so, the pull-out force required to pull out the sealing sheet 37 is reduced, so that the sealing sheet 37 is less likely to be cut when it is pulled out. In addition, the discharge port wall 41 can stabilize the posture of the sealing sheet 37 with respect to the sheet discharge port 80 when it is pulled out. Accordingly, even if the sheet discharge port 80 is inclined, the sealing sheet 37 is less likely to be cut when it is pulled out.

Note that the discharge port wall 41 may be arranged at least below the sheet discharge port 80 . However, it is preferable to form it so as to surround the sheet discharge port 80 as in the present embodiment, because the developer is less likely to be discharged from the sheet discharge port 80 .

<Other embodiments>
The sealing sheet 37 may be pulled out manually by the user, or may be pulled out by a removing device (not shown) that automatically winds up the sealing sheet 37 . In the removing device, one end of the sealing sheet 37 is fixed to a winding shaft, and the sealing sheet 37 is drawn out of the developer container 30 by rotating the winding shaft and winding up the sealing sheet 37 . When such a removing device is used, there is no possibility that the developing device 3 will be operated without the sealing sheet 37 being pulled out. It is not necessary to dispose of the sealed sheet 37 as waste.

In the above-described first and second embodiments, the case where the sealing sheet 37 is pulled out in the rotation axis direction of the stirring screw 34 has been described as an example, but the pulling direction of the sealing sheet 37 is not limited to this. In other words, the sheet discharge port 80 may be formed in a portion other than the side wall portion 30a of the developer container 30 . For example, in the case of a type in which the developing devices 3 for each color are placed in parallel on a support base (not shown) pulled out from the apparatus main body 100, and a plurality of developing devices 3 are collectively mounted on the apparatus main body 100 together with the support base, a new product is used. The sealing sheet 37 may be pulled out after the developing device 3 is placed on the support stand. In this case, the sealing sheet 37 may be pulled out in the radial direction of the stirring screw 34 instead of being pulled out in the rotation axis direction of the stirring screw 34 . To do so, for example, a sheet discharge port 80 may be formed in the wall surface 30c (see FIG. 4) of the developer container 30. FIG.

3 Developing device 17 Developer carrier (developing sleeve) 30 Developing container 30a Side wall 30c Wall surface 32a Second chamber (space) 34 Conveying screw (agitation screw) 35 First chamber (accommodating portion) 35a Opening 35b Wall 37 Sheet member (sealing sheet) 41 Protruding portion (discharge port wall) 80 Sheet discharge port

Claims (7)

a developing rotary member that carries and conveys developer containing toner and carrier to a position for developing an electrostatic latent image formed on an image carrier;
a first chamber in which the developing rotor is arranged and which supplies developer to the developing rotor; and a second chamber which is partitioned from the first chamber by a partition wall and in which the developer circulates between the first chamber and the first chamber. a storage chamber arranged vertically above the second chamber and having an opening for storing an initial developer;
a first conveying screw disposed in the first chamber for conveying the developer in the first direction;
a second conveying screw disposed with the second chamber for conveying the developer in a second direction opposite to the first direction;
a sealing sheet for sealing the opening for containing the initial developer in the containing chamber;
a sticking portion provided in the storage chamber and to which the sealing sheet is stuck;
a discharge unit for discharging the sealing sheet from the inside of the developer container to the outside of the developer container;
with
The side wall portion of the developing container has a through hole through which the rotating shaft of the second conveying screw passes,
By discharging the sealing sheet attached to the sticking portion from the inside of the developing container to the outside of the developing container through the discharging portion, the initial developer stored in the storage chamber is is movable from the storage chamber to the second chamber through an opening;
The discharge portion is disposed upstream of the opening in the second direction and vertically above the opening, and is formed on a wall surface of the developer container that intersects the side wall portion. ,
A developing device characterized by: The sticking portion is provided in the storage chamber over the entire longitudinal direction of the opening,
The sealing sheet attached to the attaching portion seals the opening over the entire longitudinal direction of the opening.
2. The developing device according to claim 1, wherein: A space partitioned by the side wall portion and the wall portion of the storage chamber in the direction of the rotation axis of the second conveying screw is formed above the second chamber in the vertical direction,
The sealing sheet is attached to the attaching portion in a state in which a free end of the sealing sheet is folded in the space.
3. The developing device according to claim 1, wherein: a guide portion that guides the sealing sheet attached to the attaching portion to the discharging portion so as to discharge the sealing sheet from the inside of the developing container to the outside of the developing container through the discharging portion; further comprising
4. The developing device according to any one of claims 1 to 3, characterized in that: The side wall portion is provided with a bearing portion that rotatably supports the second conveying screw.
5. The developing device according to any one of claims 1 to 4, characterized in that: The discharging part is provided with an elastic sealing member,
6. The developing device according to any one of claims 1 to 5, characterized in that: The elastic body is a urethane material,
7. The developing device according to claim 6, wherein:

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