JP5927778B2 - Developer container and image forming apparatus - Google Patents

Description

  The present invention relates to a developer container that contains a developer, and an image forming apparatus including the developer container.

  In an electrophotographic image forming apparatus such as a copying machine, a printer, a facsimile, or a complex machine of these, an image is formed by using a toner by a developing device. Since toner is consumed together with image formation, a toner container (toner cartridge) containing toner in a bag-like container is usually mounted on the image forming apparatus, and new toner is stored when the toner in the toner container runs out. The toner is replenished by replacing the container.

  Generally, the toner container is stored and transported in a state where the toner container is filled and sealed, and delivered to the user. If the toner container is exposed to a high-temperature and high-humidity environment for a long time, for example, during storage or transportation of the toner container or after the toner container is mounted on the image forming apparatus, In some cases, the toner may pass through and be adsorbed to the toner inside, and the toner may aggregate. It is also known that toner agglomeration is caused by moisture and volatile organic compounds released from the filled toner at a high temperature, in addition to moisture entering the container from outside the container. Here, examples of the volatile organic compound released from the toner include ethyl acetate used in the toner manufacturing process.

  If the toner aggregates and solidifies as described above, there is a possibility that the toner supply may be hindered. For example, if the toner in the toner container is agglomerated and solidified, even if the toner container is replaced with a new one, a warning of a toner end (indicating that the toner has run out) will be immediately issued, There is a problem that, when the developing device is replenished, the toner particles and the developer are not efficiently mixed and an abnormal image is generated.

  Therefore, conventionally, with respect to the problem of toner aggregation, the toner container is sealed in a moisture-proof bag containing a desiccant, or the toner container itself is made of a moisture-proof material (patent). Measures such as reference 1) have been taken.

  In the method of placing a toner container in a moisture-proof bag containing a desiccant, even if the outside is in a high-temperature and high-humidity environment, the moisture-proof bag prevents moisture from entering the toner container, The volatile organic compound is adsorbed by the desiccant to prevent toner aggregation. However, after the moisture-proof bag is opened, the moisture-proof bag becomes unnecessary, which increases waste and is not preferable from the environmental viewpoint. In addition, since the moisture-proof bag itself is made of a special material, it is expensive, and the packaging thereof requires man-hours.

On the other hand, when the toner container itself is made of a moisture-proof material, it is possible to suppress the aggregation of the toner in the toner container without causing the problem of increase in waste and cost increase as described above. . For example, examples of the moisture-proof material include a material obtained by vapor-depositing alumina on a PET sheet, and a material obtained by dry-laminating an aluminum foil on a PET sheet. These moisture-proof materials laminated to chain low-density polyethylene (LLDPE) have a moisture permeability that is normally used for toner containers (with a moisture permeability of 20 g / m ² · 24 h). It becomes about 1/400. As described above, the moisture-proof material using the moisture-proof material greatly reduces moisture permeability, so that moisture can be prevented from entering the toner container and toner aggregation is unlikely to occur.

  However, even if the toner container itself is made of a moisture-proof material, there is a possibility that moisture may enter from the sealed portion of the toner filling port of the container, and also due to moisture released from the filled toner and volatile organic compounds. There is a risk of toner aggregation. In particular, when a chemical toner is used, the volatile organic compound tends to increase as compared with the pulverized toner, and the possibility of toner aggregation increases.

  In view of such circumstances, the present invention provides a developer container capable of effectively suppressing aggregation of the developer at low cost with less burden on the environment, and an image forming apparatus including the developer container. It is something to be offered.

The invention of claim 1 is a developer container used by being mounted on an image forming apparatus, and has a container main body that stores the developer, and the container main body includes moisture, a volatile organic compound, and the like. a suction layer made of a sorbent that adsorbs the moisture barrier disposed outside the said adsorbent layer, Ri layered structure der containing the constituting layers, said moisture barrier, alumina or silica is deposited It is the component layer formed .

The Rukoto contains adsorbed layer to the structure layer of the container body, the desiccant may not pack the developer container with the moisture-proof bag can adsorb both moisture and volatile organic compounds, the developer Aggregation can be effectively suppressed.
In addition, moisture permeation can be prevented or suppressed by the moisture-proof layer, so the load of moisture adsorption on the adsorption layer can be reduced accordingly, and the adsorption effect of the adsorption layer can be maintained for a long time. It becomes.

  According to the present invention, even if the developer container is exposed for a long time in a high temperature and high humidity environment, the container body composed of the adsorbent adsorbs both moisture and volatile organic compounds. Aggregation of the developer can be effectively suppressed. Further, according to the present invention, since the container main body is made of the adsorbent, it is not necessary to pack the developer container in a moisture-proof bag containing a desiccant as in the conventional case. For this reason, the manufacturing and packaging process of a moisture-proof bag are unnecessary, and aggregation of the developer can be suppressed at a low cost. Furthermore, since the disposal of the moisture-proof bag after opening is unnecessary, the influence on the environment can be reduced.

1 is a schematic configuration diagram of an image forming apparatus equipped with a developer container according to the present invention. FIG. 2 is an external view of the image forming apparatus. FIG. 3 is a schematic configuration diagram of a toner supply device. It is a figure which shows the container main body of the developer container which concerns on this invention, (a) is the side sectional drawing, (b) is the bottom view. It is a figure which shows the other shape of a container main body, (a) is the side sectional drawing, (b) is the bottom view. It is a figure which shows another shape of a container main body, (a) is the side surface sectional drawing, (b) is the bottom view. It is an expanded sectional view of a container main part.

  Hereinafter, the present invention will be described with reference to the accompanying drawings. In the drawings for explaining the present invention, components such as members and components having the same function or shape are denoted by the same reference numerals as much as possible, and once described, the description will be given. Omitted.

FIG. 1 is a schematic configuration diagram of a color image forming apparatus equipped with a developer container (toner container) according to the present invention.
First, the overall configuration of the color image forming apparatus will be described with reference to FIG.
In the apparatus main body 100 of the image forming apparatus shown in FIG. 1, images of different colors of yellow (Y), magenta (M), cyan (C), and black (Bk) corresponding to the color separation components of the color image are formed. Four image forming units 1Y, 1M, 1C, and 1Bk are provided. Each of the image forming units 1Y, 1M, 1C, and 1Bk has the same configuration except that it stores toners of different colors.

  Specifically, each of the image forming units 1Y, 1M, 1C, and 1Bk includes a drum-shaped photosensitive member 2 as a latent image carrier, a charging device 3 that charges the surface of the photosensitive member 2, and a surface of the photosensitive member 2. A developing device 4 for supplying toner to the toner, and a cleaning device 5 for cleaning the surface of the photoreceptor 2. In FIG. 1, only the photoconductor 2, the charging device 3, the developing device 4, and the cleaning device 5 included in the yellow image forming unit 1 </ b> Y are denoted by reference numerals. In the other image forming units 1 </ b> M, 1 </ b> C, and 1 </ b> Bk, The reference numerals are omitted.

  In FIG. 1, an exposure device 6 that exposes the surface of the photosensitive member 2 is disposed above each of the image forming units 1Y, 1M, 1C, and 1Bk. The exposure device 6 includes a light source, a polygon mirror, an f-θ lens, a reflection mirror, and the like, and irradiates the surface of each photoreceptor 2 with laser light based on image data.

  A transfer device 7 is disposed below each of the image forming units 1Y, 1M, 1C, and 1Bk. The transfer device 7 has an intermediate transfer belt 8 constituted by an endless belt as a transfer body. The intermediate transfer belt 8 is stretched around a plurality of rollers 13, 14, 15 as support members. When one of these rollers is driven to rotate, the intermediate transfer belt 8 rotates in the direction indicated by the arrow in the figure. It is configured to run (rotate).

  Four primary transfer rollers 11 as primary transfer means are disposed at positions facing the four photoconductors 2. Each primary transfer roller 11 presses the inner peripheral surface of the intermediate transfer belt 8 at each position, and a primary transfer nip is formed at a location where the pressed portion of the intermediate transfer belt 8 and each photoconductor 2 are in contact with each other. ing. Each primary transfer roller 11 is connected to a power source (not shown), and a predetermined direct current voltage (DC) and / or alternating current voltage (AC) is applied to the primary transfer roller 11.

  Further, a secondary transfer roller 12 as a secondary transfer unit is disposed opposite one of the rollers (a roller indicated by reference numeral 15 in FIG. 1) that stretches the intermediate transfer belt 8. The secondary transfer roller 12 presses the outer peripheral surface of the intermediate transfer belt 8, and a secondary transfer nip is formed at a location where the secondary transfer roller 12 and the intermediate transfer belt 8 are in contact with each other. Similar to the primary transfer roller 11, the secondary transfer roller 12 is connected to a power source (not shown) so that a predetermined direct current voltage (DC) and / or alternating current voltage (AC) is applied to the secondary transfer roller 12. It has become.

  A lower part of the image forming apparatus main body 100 is provided with a paper feed cassette 16 that stores a recording medium P such as paper or an OHP sheet, and a paper feed roller 17 that feeds the recording medium P from the paper feed cassette 16. A registration roller pair 18 for adjusting the conveyance timing of the recording medium P is provided in the middle of the conveyance path for conveying the recording medium P from the paper feed cassette 16 to the secondary transfer nip.

  A paper discharge tray 19 for stocking the recording medium P discharged outside is provided on the left outer surface of the image forming apparatus main body 100 in the drawing. A fixing device 9 for fixing an image on the recording medium P is disposed in the middle of the conveyance path for conveying the recording medium P from the secondary transfer nip to the paper discharge tray 19.

  Further, toner containers 20Y, 20M, 20C, and 20Bk that store toners of various colors are detachably mounted on the upper portion of the image forming apparatus main body 100. Each of the toner containers 20Y, 20M, 20C, and 20Bk stores toner of any one of yellow, magenta, cyan, and black, and each toner container 20Y, 20M, The toner is supplied to each developing device 4 from 20C and 20Bk.

An image forming operation of the image forming apparatus will be described with reference to FIG.
When the image forming operation is started, the photoreceptors 2 of the image forming units 1Y, 1M, 1C, and 1Bk are rotated counterclockwise in FIG. 1, and the surface of each photoreceptor 2 has a predetermined polarity by the charging device 3. Are uniformly charged. Based on the image information of the document read by a reading device (not shown), the exposure device 6 irradiates the charged surface of each photoconductor 2 with laser light, and an electrostatic latent image is formed on the surface of each photoconductor 2. . At this time, the image information to be exposed on each photoconductor 2 is single-color image information obtained by separating a desired full-color image into color information of yellow, magenta, cyan, and black. As the electrostatic latent image formed on the photosensitive member 2 is supplied with toner by each developing device 4, the electrostatic latent image is visualized (visualized) as a toner image.

  One of the rollers over which the intermediate transfer belt 8 is stretched is driven to rotate, causing the intermediate transfer belt 8 to run around. Also, a primary transfer nip between each primary transfer roller 11 and each photoreceptor 2 is applied to each primary transfer roller 11 by applying a constant voltage or a voltage controlled by a constant current opposite to the charging polarity of the toner. A transfer electric field is formed. Then, the toner images of the respective colors on the respective photoconductors 2 are sequentially superimposed and transferred onto the intermediate transfer belt 8 by the transfer electric field formed in the primary transfer nip. Thus, the intermediate transfer belt 8 carries a full-color toner image on its surface. The toner on each photoconductor 2 that could not be transferred to the intermediate transfer belt 8 is removed by the cleaning device 5.

  When the image forming operation is started, the paper feeding roller 17 rotates and the recording medium P is carried out from the paper feeding cassette 16. The unloaded recording medium P is timed by the registration roller pair 18 and sent to the secondary transfer nip between the secondary transfer roller 12 and the intermediate transfer belt 8. At this time, a transfer voltage having a polarity opposite to the toner charging polarity of the toner image on the intermediate transfer belt 8 is applied to the secondary transfer roller 12, thereby forming a transfer electric field in the secondary transfer nip. Then, the toner image on the intermediate transfer belt 8 is collectively transferred onto the recording medium P by the transfer electric field formed in the secondary transfer nip. Thereafter, the recording medium P is sent to the fixing device 9 and the toner image is fixed on the recording medium P. Then, the recording medium P is discharged and stocked on a discharge tray 19 outside the apparatus.

  The above description is an image forming operation when a full color image is formed on a recording medium. A single color image is formed using any one of the four image forming units 1Y, 1M, 1C, and 1Bk, It is also possible to form a two-color or three-color image using two or three image forming units.

FIG. 2 is an external view of the image forming apparatus.
As shown in FIG. 2, the image forming apparatus main body 100 is provided with four open / close doors 101. When the toner in each of the toner containers 20Y, 20M, 20C, and 20Bk is consumed and the remaining amount of toner is exhausted, the toner containers 20Y, 20M, 20C, and 20Bk are replaced by opening the doors 101. Can be done.

FIG. 3 is a diagram illustrating a configuration of the toner replenishing device.
Note that one toner replenishing device is provided for each of the toner containers 20Y, 20M, 20C, and 20Bk, but the configuration of the four toner replenishing devices is substantially the same. The configuration of the toner replenishing device provided in the container 20Y will be described as an example.

  As shown in FIG. 3, the toner replenishing device 30 includes a connecting portion 31 connected to the cap member 21 of the toner container 20Y, a screw pump 32 connected to the developing device 4, and the screw pump 32 and the connecting portion 31. And the like are provided.

  The connection unit 31 is provided in the installation unit 102 in which the toner container 20Y is installed. When the opening / closing door 101 (see FIG. 2) is opened and the toner container 20 </ b> Y is installed in the installation unit 102, the base member 21 is connected to the connection unit 31. At this time, the toner discharge port of the cap member 21 is opened, so that the toner T in the toner container 20Y can be transported to the tube 33 side via the connecting portion 31.

  The screw pump 32 includes a rotor 34, a stator 35, a suction port 36, a universal joint 37, a motor 38, and the like. The rotor 34 is formed such that a shaft made of a metal material is spirally twisted. One end of the rotor 34 is rotatably connected to a motor 38 via a universal joint 37. The stator 35 is made of a rubber material, and the hole is formed such that an oval cross section is adapted to a spiral. A rotor 34 is inserted into the hole of the stator 35.

The screw pump 32 configured as described above is driven as follows.
When the motor 38 is driven to rotate the rotor 34, a suction pressure is generated in a spiral space between the rotor 34 and the stator 35, and the inside of the tube 33 is reduced to a negative pressure. As a result, the toner T in the toner container 20Y enters the screw pump 32 from the suction port 36 via the tube 33. The toner T is discharged from the delivery port 39 of the screw pump 32 and is replenished into the developing device 4 from the replenishing port 40.

  The toner replenished in the developing device 4 is circulated and conveyed while being stirred by the first conveying screw 41 and the second conveying screw 42. As a result, the toner that is frictionally charged and adsorbed on the carrier is carried on the developing roller 43 together with the carrier. When the toner carried on the developing roller 43 reaches the position of the developing blade 44, the toner is thinned by the developing blade 44. When the thinned toner reaches a position facing the photoconductor 2, it adheres to the electrostatic latent image formed on the photoconductor 2, and the electrostatic latent image is visualized as a toner image.

Hereinafter, the configuration of the toner container which is a characteristic part of the present invention will be described.
4A and 4B are views showing the container body of the toner container according to the present invention, in which FIG. 4A is a side sectional view and FIG. 4B is a bottom view thereof.
The container body 22 is configured by forming a deformable sheet material into a bag shape by heat sealing. In this embodiment, the container body 22 is a square bottom container having a bottom surface formed in a square shape, but the shape of the container body 22 is not limited to this, and a standing pouch as shown in FIG. Various forms such as a gusset bag as shown in FIG. 5 or a three-side seal bag (not shown) can be adopted.

In FIG. 7, the expanded sectional view of a container main body is shown.
As shown in FIG. 7, the container body 22 has a five-layer structure including an outermost layer 23, a moisture-proof layer 24, an intermediate layer 25, an adsorption layer 26, and an innermost layer 27 in order from the outside. Yes. Specifically, the outermost layer 23 is an expanded polypropylene (OPP) film having a thickness of 25 μm, the moisture-proof layer 24 is an alumina-deposited PET film having a thickness of 12 μm, the intermediate layer 25 is a low-density polyethylene (LDPE) film having a thickness of 10 μm, and an adsorption layer. The layer 26 is a film in which synthetic zeolite or the like having a thickness of 40 μm is kneaded, and the innermost layer 27 is formed by a low density polyethylene (LDPE) film having a thickness of 10 μm. Each constituent layer is bonded by dry lamination. The material used for the adsorption layer 26 may be selected and changed according to the type of substance to be adsorbed.

  The moisture-proof layer 24 is for preventing or suppressing moisture existing outside the container body 22 from penetrating into the inside. The moisture-proof layer 24 is not limited to completely blocking moisture permeation, and may be one that suppresses moisture permeation to some extent.

  The adsorbing layer 26 adsorbs moisture and volatile organic compounds released from toner or the like. If the toner container is filled with toner and sealed, and placed in a high-temperature and high-humidity environment, moisture and volatile organic compounds are released from the internal toner. The organic compound is adsorbed by the adsorption layer 26. Further, the moisture outside the toner container is basically prevented from permeating by the moisture-proof layer 24, but the permeated moisture is adsorbed by the adsorption layer 26 even if part of the moisture permeates. Even when the volatile organic compound is transmitted from the outside of the toner container, the transmitted volatile organic compound is also adsorbed by the adsorption layer 26.

The inventor conducted a test for examining the effect of suppressing toner aggregation using the toner container according to the present embodiment and the toner container of the comparative example. Hereinafter, this test will be described in detail.
The configuration of the toner container according to the present embodiment is as described above, while the configuration of the comparative example is obtained by omitting the adsorption layer 26 from the configuration of the present embodiment. That is, in the toner container of the comparative example, an expanded polypropylene (OPP) film having a thickness of 25 μm, an alumina-deposited PET film (moisture-proof layer) having a thickness of 12 μm, and a low-density polyethylene (LDPE) film having a thickness of 50 μm are sequentially arranged from the outside. It is constructed by laminating and dry laminating them.

  In each of the toner containers of the present embodiment and the comparative example, 300 g of toner of imgioMPN toner magenta C3300 manufactured by Ricoh Co., Ltd. is filled and sealed, and this is placed in an environment of a temperature of 40 ° C. and a humidity of 70%. After storing for 31 days, the aggregation of the toner in the toner container was evaluated.

  To evaluate toner aggregation, remove the toner from each toner container after storage under the above conditions, place 20 g of the toner on a metal mesh, and apply vibration to recover the toner aggregate remaining on the mesh. And measuring the weight. The mesh opening was 75 μm, the wire diameter was 50 μm, and vibration was applied by dropping a hard bar from the height of 30 mm on the mesh frame. Further, vibration was performed until the toner did not collapse, and the remaining agglomerates were collected and their weights were measured.

  As a result, the amount of toner remaining on the mesh was 0.0005 g in this embodiment and 0.0080 g in the comparative example, and the amount of toner aggregates in this embodiment was significantly reduced compared to the comparative example. This result is because the comparative example having no adsorption layer 26 cannot adsorb moisture or volatile organic compounds released from the toner or the like, and conversely, the present embodiment having the adsorption layer 26. This is probably because moisture and volatile organic compounds could be adsorbed.

  As described above, the toner container according to the present embodiment can adsorb moisture and volatile organic compounds by the adsorption layer 26 even when exposed to a high temperature and high humidity environment for a long period of time. It is possible to suppress aggregation of the toner inside due to the influence of moisture and volatile organic compounds. Furthermore, in the present embodiment, moisture permeation from the outside can be prevented by the moisture-proof layer 24, so that the load of moisture adsorption of the adsorption layer 26 can be reduced correspondingly, and the adsorption effect by the adsorption layer 26 can be extended over a long period of time. Can be sustained.

  In addition, the constituent material, thickness, etc. of the container main body 22 mentioned in the above-described embodiment are merely examples of the present invention, and the configuration of the present invention is not limited to this. The configuration of the present invention can be variously modified without departing from the gist of the present invention.

  For example, for the adsorption layer 26, it is possible to select a porous material such as silica gel, alumina, activated carbon, etc., in addition to zeolite, according to the type of substance to be adsorbed. In addition, a plurality of types may be selected from materials that can be used for these adsorption layers 26 and used together.

  Further, the adsorbing layer 26 may be provided in a necessary amount according to the amount of water generated or the amount of volatile organic compounds. Therefore, it is not always necessary to provide the adsorption layer 26 on the entire container body 22, and the adsorption layer 26 may be provided on a part of the container body 22. For example, in the case of a configuration like the gusset bag shown in FIG. 6, since four sheet materials are bonded together, the size (area, etc.) of each sheet material and the amount of adsorbent required are taken into consideration. Thus, the adsorption layer 26 may be provided only on a part of the sheet material. Further, as described above, the adsorption layer 26 can adsorb both the moisture generated inside the container body 22 and the moisture transmitted from the outside, so that the moisture-proof layer 24 may not be provided. It is.

  Moreover, since the moisture-proof layer 24 becomes transparent when using the vapor-deposited alumina deposited on the PET as in the embodiment described above, the other constituent layers of the container body 22 are transparent or translucent members. By comprising in this, the inside of the container main body 22 can be visually recognized now. As a result, the color and remaining amount of the developer stored in the container body 22 can be easily confirmed. In the above-described embodiment, the constituent layers other than the adsorption layer 26 are transparent. However, since the adsorption layer 26 is translucent, the entire layer is translucent. In addition, when the moisture-proof layer 24 obtained by vapor-depositing silica on PET is used, the moisture-proof layer 24 becomes transparent. Similarly, by configuring other constituent layers with transparent or translucent members, the container body The inside of 22 can be visually recognized.

  Alternatively, aluminum (for example, a dry laminate of an aluminum foil and a PET film) may be used for the moisture-proof layer 24. Since the moisture-proof layer 24 using aluminum has high strength and is not easily cracked even when bent, it can reduce the risk of moisture intrusion from the crack, and has excellent moisture resistance.

  In the above-described embodiment, the two-component developer composed of toner and carrier is used as the developer. However, the present invention is not limited to this, and can be applied to an image forming apparatus using a one-component developer composed of toner. It is. The image forming apparatus to which the configuration of the present invention is applied is not limited to a so-called tandem type color laser printer in which a plurality of photosensitive members as shown in FIG. It may be a machine, a facsimile, or a complex machine of these.

  As described above, according to the present invention, since the adsorbent (adsorption layer) constituting the container body can adsorb both moisture and volatile organic compounds, it is possible to effectively suppress toner aggregation. it can. Further, according to the present invention, since the container main body is made of the adsorbent, it is not necessary to pack the developer container in a moisture-proof bag containing a desiccant as in the conventional case. This eliminates the need for a moisture-proof bag manufacturing and packaging process, and can suppress toner aggregation at low cost. Furthermore, since the disposal of the moisture-proof bag after opening is unnecessary, the influence on the environment can be reduced.

20 Toner container (developer container)
22 Container body 24 Moisture-proof layer 26 Adsorption layer

JP 2009-204873 A

Claims (13)

A developer container that is mounted on an image forming apparatus and used.
A container body for containing the developer;
The container body, the moisture and the volatile organic compound adsorbed layer made of a sorbent that adsorbs, Ri layered structure der containing a moisture barrier disposed outside the said adsorbed layer to the structure layer ,
The developer container, wherein the moisture-proof layer is a constituent layer formed by depositing alumina or silica . A developer container that is mounted on an image forming apparatus and used.
A container body for containing the developer;
The container body includes an adsorption layer made of an adsorbent that adsorbs moisture and a volatile organic compound, a moisture-proof layer disposed outside the adsorption layer, and the moisture-proof layer and the adsorption layer. A developer container, wherein the developer container has a laminated structure including an intermediate layer disposed in the structure layer as a constituent layer . The developer container according to claim 2 , wherein the moisture-proof layer is a constituent layer formed using aluminum . Of the constituent layers constituting the laminate structure of the container body, the developer container according to claim 1, the other constituent layers except the moisture barrier, and a transparent or semi-transparent member.   5. The developer container according to claim 1, wherein the container main body has a laminated structure including the adsorption layer in at least a part of the container main body. The container body, developer container according to claim 1 or 4 which is a laminated structure having an intermediate layer between the adsorption layer and the moisture barrier.   The developer container according to claim 1, wherein the container body has an outermost layer having a laminated structure outside the moisture-proof layer.   The developer container according to claim 1, wherein the container main body has an innermost layer having a laminated structure inside the adsorption layer. The container body includes, in order from the outside, the outermost layer and the moisture-proof layer, an intermediate layer, and the adsorption layer, accommodating a developing agent according to claim 1 or 4 is a five-layer structure composed of the innermost layer vessel.   The developer container according to any one of claims 1 to 9, wherein the container main body has a bag shape and is configured to be deformable in outer shape.   The developer container according to claim 1, wherein the developer contains at least toner.   The developer container according to claim 11, wherein the developer further includes at least a carrier in addition to the toner. It has an installation part that can be fitted with a developer container.
An image forming apparatus comprising the developer container according to claim 1 as the developer container.

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