JP7024299B2 - Develop equipment, assembly and image forming equipment - Google Patents

Description

The present invention relates to a developing device, an assembly and an image forming device.

Patent Document 1 describes a developer carrier that carries a developer on a surface and rotates, and supplies toner to a latent image on the surface of the latent image carrier at a position facing the latent image carrier to develop the developer. In the developer supply region, which includes a developer transport member for transporting the developer and supplies the developer to the developer carrier, the developer transports the developer while supplying the developer to the developer carrier. A path and a developer replenishing means for replenishing the developer to the developer transport path are provided, and a predetermined height at a position where the bulk of the developer increases or decreases according to an increase or decrease in the amount of the developer in the entire developer transport path. In a developing device provided with a developing agent discharging port for discharging the developing agent to the outside of the device in the developing agent transport path, a discharging port opening / closing member capable of changing between a closed state and an open state with respect to the developing agent discharging port. The discharge port opening / closing member is movable up and down, closes the discharge port when it is below, opens the discharge port when it is above, and is urged downward. Described is a developing apparatus characterized in that the force is set to be smaller than the agent pressure applied to the opening / closing member when the agent is increased.

Patent Document 2 is a developing device that accommodates a developer having a carrier and toner and develops a latent image formed on an image carrier, wherein a screw portion is formed on a shaft portion and a screw portion is formed. A plurality of transport members that transport the developer contained in the apparatus in the longitudinal direction to form a circulation path, a supply means for newly supplying a carrier into the apparatus, and one of the plurality of transport members. A discharge port formed in a partition wall of a transport path by the one transport member for discharging the developer to the outside when the height of the developer transported by One transport member includes a notch region in which the screw portion is not formed in a part in the longitudinal direction, and the discharge port faces the notch region and is smaller in length in the longitudinal direction than the notch region. A wall that is formed so as to be such that, on the upstream side of the transport path with respect to the discharge port and within the range of the notch region, the wall projectes from the partition wall on which the discharge port is formed toward the inside of the transport path. A developing device characterized by having a unit installed is described.

Japanese Unexamined Patent Publication No. 2009-047891 Japanese Unexamined Patent Publication No. 2009-066225

By the way, in a developing apparatus, a discharge structure is known in which a developer is discharged to the outside through a discharge port when the height of the developer stored in the storage portion exceeds the height of the discharge port formed on the side wall of the storage portion. ing. In a developing apparatus provided with a discharge structure, the developer in the housing may be splashed up and scattered by the rotation of the auger provided in the housing, and may be discharged through the discharge port. As described above, if the developer is discharged through the discharge port before the high level of the developer exceeds the lower edge of the discharge port, the amount of the developer in the accommodating portion becomes insufficient.

An object of the present invention is a developing apparatus and an image capable of suppressing excessive discharge of a developer due to splashing, as compared with a developer whose discharge is suppressed only by a member covering an opening. It is to provide a forming device.

The developing apparatus according to the first aspect is rotated and developed in a developing apparatus that develops an electrostatic latent image formed on the surface of an image holder as a toner image using a developer containing a magnetic carrier and toner. An accommodating portion for accommodating a conveying member for conveying an agent, an opening opening laterally when viewed from the axial direction of the conveying member, and an overhanging portion extending from below the opening to the outside of the accommodating portion. A housing having a housing, a magnet supported by the overhanging portion on the outside of the housing portion with respect to the opening surface of the opening, one end fixed above the opening in the housing, and the other end. It is provided with a covering member for covering the opening in a state of being in contact with the magnet from the side opposite to the side of the opening.

The developing apparatus according to the second aspect is rotated and developed in a developing apparatus that develops an electrostatic latent image formed on the surface of an image holder as a toner image using a developer containing a magnetic carrier and toner. An accommodating portion for accommodating a conveying member for conveying an agent, an opening opening laterally when viewed from the axial direction of the conveying member, and an overhanging portion extending from below the opening to the outside of the accommodating portion. A housing having a housing, a magnet supported by the overhanging portion on the outside of the housing portion with respect to the opening surface of the opening, one end fixed above the opening in the housing, and the other end. A covering member that covers the opening in a state of being in contact with the magnet from the side opposite to the side of the opening and guides the developer splashed inside the housing from the opening to the side of the magnet. , Is provided.

The developing apparatus according to the third aspect is rotated and developed in a developing apparatus that develops an electrostatic latent image formed on the surface of an image holder as a toner image using a developer containing a magnetic carrier and toner. An accommodating portion for accommodating a conveying member for conveying an agent, an opening opening laterally when viewed from the axial direction of the conveying member, and an overhanging portion extending from below the opening to the outside of the accommodating portion. A housing having a housing, a magnet supported by the overhanging portion on the outside of the housing portion with respect to the opening surface of the opening, one end fixed above the opening in the housing, and the other end. A covering member that covers the opening in a state of being in contact with the magnet from the side opposite to the side of the opening and vibrates in contact with the developer whose higher position exceeds the lower edge of the opening. It is prepared.

The developing apparatus according to the fourth aspect is the developing apparatus according to any one of the first to third aspects , wherein the covering member is a thin plate-shaped member and is elastically bent and deformed. The other end is in contact with the magnet.

The developing apparatus according to the fifth aspect is the developing apparatus according to the fourth aspect , in which the covering member is bent and deformed in a direction convex toward the opening.

The developing apparatus according to the sixth aspect is the developing apparatus according to any one of the first to fifth aspects , wherein the covering member is a developer whose height is higher than that of the lower edge of the opening. When it is discharged from the accommodating portion, it vibrates while maintaining contact with the magnet.

The developing apparatus according to the seventh aspect is the developing apparatus according to the sixth aspect , wherein the covering member is in a cantilevered support state in which the other end is a free end and is in contact with the magnet in a non-fixed state. Is what you are doing.

The developing apparatus according to the eighth aspect is the developing apparatus according to any one of the first to seventh aspects , wherein the magnet extends along the axial direction and the opening of the opening in the axial direction is opened. It is arranged over a range.

The developing apparatus according to the ninth aspect is the developing apparatus according to the eighth aspect , wherein only one end of the magnet protrudes from the opening in the axial direction.

The developing apparatus according to the tenth aspect is the developing apparatus according to the ninth aspect , wherein only one end of the magnet protrudes from the covering member in the axial direction.

The developing apparatus according to the eleventh aspect is the developing apparatus according to any one of the first to tenth aspects, wherein the space surrounded by the opening surface, the covering member, and the overhanging portion is described above. When viewed from the axial direction, the overhanging portion has a triangular shape with a base.

The developing apparatus according to the twelfth aspect is the developing apparatus according to any one of the first to eleventh aspects , wherein the overhanging portion extends horizontally along the lower edge of the opening. The magnet is placed on the upper surface of the overhanging portion.

The developing apparatus according to the thirteenth aspect is the developing apparatus according to the twelfth aspect , wherein the magnet has a rectangular shape when viewed from the axial direction, and the corner is on the upper side and opposite to the side of the opening. The other end of the covering member is in contact with the portion.

The assembly according to the fourteenth aspect includes an image holder on which a latent image is formed and a developing device according to any one of the first to thirteenth aspects , and is included in the image forming apparatus main body. On the other hand, it was assembled so that it could be exchanged as a unit.

The image forming apparatus according to the fifteenth aspect forms a latent image on an image holder, a charging device that charges the outer peripheral surface of the image holder, and an outer peripheral surface of the image holder charged by the charging device. It is provided with a latent image forming apparatus, a developing apparatus according to any one of the first to thirteenth embodiments , and a transfer apparatus for transferring the toner image to a transfer target.

According to the developing apparatus of the first aspect , it is possible to suppress excessive discharge of the developing agent due to splashing, as compared with the one in which the developing agent splashed up by the transport member is suppressed from being discharged only by the member covering the opening. ..

According to the developing apparatus of the second aspect , it is possible to suppress excessive discharge of the developing agent due to splashing, as compared with the one in which the developing agent splashed up by the transport member is suppressed from being discharged only by the member covering the opening. ..

According to the developing apparatus of the third aspect , it is possible to suppress excessive discharge of the developer due to splashing, as compared with the one in which discharge of the developer splashed by the transport member is suppressed only by the member covering the opening. ..

According to the developing apparatus of the fourth aspect , it is possible to suppress excessive discharge of the developing agent due to splashing, as compared with the configuration in which the covering member comes into contact with the magnet in a free state.

According to the developing apparatus of the fifth aspect , a covering member that comes into contact with a magnet in a bent state can be formed by a flat thin plate-shaped member.

According to the developing apparatus of the sixth aspect , the opening and the covering are compared with the configuration in which the covering member does not vibrate when the developing agent whose height is higher than the lower edge of the opening is discharged from the housing. Discharge of the developer from the space surrounded by the member and the overhanging portion is promoted.

According to the developing apparatus of the seventh aspect , the discharge of the developer from the space surrounded by the opening, the covering member, and the overhanging portion is promoted as compared with the configuration in which the other end of the covering member is fixed to the magnet. Ru.

According to the developing apparatus of the eighth aspect , excessive discharge of the developer due to splashing is suppressed as compared with the configuration in which the magnet is arranged only in a part of the opening range of the opening in the axial direction.

According to the developing apparatus of the ninth aspect , the developer from one side of the opening in the axial direction is compared with the configuration in which magnets are arranged so as to protrude from both ends of the opening range of the opening in the axial direction. Emissions are promoted.

According to the developing apparatus of the tenth aspect , the discharge of the developer from one side of the covering member in the axial direction is promoted as compared with the configuration in which the magnets are arranged so as to protrude from both ends of the covering member in the axial direction. Will be done.

According to the developing apparatus of the eleventh aspect , the excessive discharge of the jumping developer is suppressed as compared with the one having a rectangular space.

According to the developing apparatus of the twelfth aspect , the excessive discharge of the jumping developer is suppressed as compared with the configuration in which the upper surface of the magnet and the lower edge of the opening are aligned in the vertical direction.

According to the developing apparatus of the thirteenth aspect , the excess discharge of the developer from the space surrounded by the opening, the covering member, and the overhanging portion is compared with the configuration provided with the round magnet when viewed from the axial direction. Is suppressed.

According to the assembly of the fourteenth aspect , image unevenness in the toner image on the image holder is suppressed as compared with the one without the developing device according to any one of the first to thirteenth aspects . be able to.

According to the image forming apparatus of the fifteenth aspect , image unevenness in the output image can be suppressed as compared with the one without the developing apparatus according to any one of the first to thirteenth aspects .

It is a schematic front view which showed the image forming apparatus which concerns on this embodiment. It is a schematic front view which showed the image forming part of the image forming apparatus which concerns on this embodiment. It is a schematic front view which showed the toner image forming part of the image forming apparatus which concerns on this embodiment. It is a perspective view of the developing apparatus which concerns on this embodiment. It is a cross-sectional view of 5-5 of FIG. It is a perspective view which looked at the discharge port of the developing apparatus which concerns on this embodiment from the outside. It is a side view which shows the positional relationship between the discharge port of the developing apparatus which concerns on this embodiment, a film, and a magnet. It is an enlarged sectional view of the discharge port portion in FIG. It is a graph which shows the relationship between the film thickness of the developing apparatus which concerns on this embodiment, and the displacement amount of a film.

An example of the image forming apparatus according to the embodiment of the present invention will be described with reference to FIGS. 1 to 10. The arrow H shown in each figure indicates the height direction of the device (vertical direction of the device), and the arrow W indicates the width direction of the device.

<Overall configuration of image forming device>
As shown in FIG. 1, the image forming apparatus 10 conveys an image forming unit 12 that forms an image by an electrophotographic method and a plurality of sheet members P on which an image is formed along a conveying path 16 of the sheet member P. It is equipped with a transport member (reference numeral omitted). Here, the sheet member P is an example of a transferred body.

Further, the image forming apparatus 10 includes a cooling unit 20 for cooling the sheet member P on which the image is formed, a straightening unit 22 for correcting the curvature of the sheet member P, and an image inspection for inspecting the image formed on the sheet member P. It is provided with a unit 24.

Further, the image forming apparatus 10 inverts the sheet member P having an image formed on the surface in order to form an image on both sides of the sheet member P, and inverts the sheet member P to convey the image to the image forming unit 12 again. It has a route 26.

In the image forming apparatus 10 having the above configuration, the image (toner image) formed by the image forming unit 12 is formed on the surface of the sheet member P to be conveyed along the conveying path 16. Further, the sheet member P on which the image is formed passes through the cooling unit 20, the straightening unit 22, and the image inspection unit 24 in this order, and is discharged to the outside of the apparatus.

On the other hand, when an image is formed on the back surface of the sheet member P, the sheet member P on which the image is formed on the front surface is conveyed along the inversion path 26, and the image is again displayed on the back surface of the sheet member P by the image forming unit 12. It is formed.

As shown in FIGS. 1 and 2, the image forming unit 12 is incorporated in the image forming apparatus main body 10A.
The image forming unit 12 includes a plurality of toner image forming units 30 that form toner images of each color, and a transfer unit 32 that transfers the toner image formed by the toner image forming unit 30 to the sheet member P. Further, the image forming unit 12 includes a fixing device 34 for fixing the toner image transferred to the sheet member P by the transfer unit 32 to the sheet member P.

A plurality of toner image forming units 30 are provided so as to form a toner image for each color. In the present embodiment, a toner image forming unit 30 having a total of six colors of white (W), silver (S), yellow (Y), magenta (M), cyan (C), and black (K) is provided. (W), (S), (Y), (M), (C), and (K) shown in FIG. 2 indicate the above-mentioned colors.

The four colors of yellow (Y), magenta (M), cyan (C), and black (K) are standard colors for outputting a color image, and white (W) and silver (S) are standard colors. It is a color different from the color and is a color for expanding the color range of the output image (hereinafter referred to as "special color").
Further, in the present embodiment, the particle sizes of the yellow (Y), magenta (M), cyan (C), and black (K) developer G are substantially the same, and white (W) and silver (W) and silver ( The particle size of each developer G in S) is different from the particle size of the developer G having the standard color.

In the following description, if it is not necessary to distinguish between white (W), silver (S), yellow (Y), magenta (M), cyan (C), and black (K), they are designated by reference numerals. W, S, Y, M, C, and K are omitted.

The toner image forming unit 30 of each color is basically configured in the same manner except for the toner to be used. As shown in FIG. 3, the rotating cylindrical image holder 40 and the charger for charging the image holder 40 are charged. It is equipped with 42. Further, the toner image forming unit 30 is electrostatically latent with an exposure device 44 that irradiates a charged image holder 40 with exposure light to form an electrostatic latent image, and a developer G composed of a carrier and toner. It is provided with a developing device 46 that develops an image as a toner image.
Here, the charger 42 is an example of a charging device, and the exposure device 44 is an example of a latent image forming device.
The details of the developing device 46 will be described later.

Further, the present embodiment includes an image holder 40 on which a latent image is formed and a developing device 46 described later that develops a latent image formed on the outer peripheral surface of the image holder 40 as a toner image, and forms an image. It is assembled as an assembly so that it can be replaced integrally with the device body 10A.

Further, as shown in FIG. 2, the toner image forming unit 30 is connected to the developing device 46 of each color via a supply tube (not shown), and the toner of each color for supplying the developer G to the developing device 46 of each color. The cartridge 28 is provided.

Further, the image holder 40 of each color is in contact with the transfer belt 50 (details will be described later) that moves around. Then, in the circumferential direction of the transfer belt 50 (see the arrow in the figure), white (W), silver (S), yellow (Y), magenta (M), cyan (C), and black (K) are formed from the upstream side. The toner image forming portions 30 are arranged side by side in the horizontal direction in this order. In the toner image forming unit of each color, an image of each color is formed by using the toner of each color.

As shown in FIG. 2, the transfer unit 32 is wound around a plurality of rolls (reference numerals omitted), orbits in the direction of an arrow in the figure, and has a transfer belt 50 and a transfer belt 50 that come into contact with the image holder 40 of each color. It is provided with a primary transfer roll 52 that is sandwiched and arranged on the opposite side of the image holder 40 of each color. The primary transfer roll 52 transfers the toner image formed on the image holder 40 to the transfer belt 50.
Here, the transfer unit 32 is an example of a transfer device.
Further, the transfer unit 32 is arranged on the opposite side of the roll 56 around which the transfer belt 50 is wound and the roll 56 with respect to the transfer belt 50, and transfers the toner image transferred to the transfer belt 50 to the sheet member P. It includes a secondary transfer roll 54. With this configuration, a transfer nip NT for transferring a toner image to the sheet member P is formed between the secondary transfer roll 54 and the transfer belt 50.
In the above configuration, the toner image formed by the toner image forming unit 30 of each color is primary transferred to the rotating transfer belt 50 by the primary transfer roll 52. Further, the toner image primaryly transferred to the transfer belt 50 is secondarily transferred to the sheet member P by the secondary transfer roll 54.

The fixing device 34 includes a fixing belt 60 that is wound around a plurality of rolls (reference numeral omitted) and heated, and a pressure roll 62 that pressurizes the sheet member P toward the fixing belt 60.

In this configuration, the sheet member P to which the toner image is transferred is sandwiched between the rotating fixing belt 60 and the pressure roll 62, so that the toner image is fixed to the sheet member P.

Next, the image forming step in the image forming apparatus 10 will be described.

As shown in FIG. 1, when the image forming apparatus 10 is activated, image data of each color of white (W), silver (S), yellow (Y), magenta (M), cyan (C), and black (K) is displayed. It is output to the exposure apparatus 44. Then, the light emitted from the exposure device 44 according to the image data exposes the outer peripheral surface (surface) of the image holder 40 charged by the charger 42, so that the electrostatic latency corresponding to the image data of each color is obtained. An image is formed on the surface of each image holder 40.

Subsequently, the electrostatic latent image formed on the surface of each image holder 40 is developed as a toner image by each developing device 46. Then, the toner image on the surface of each image holder 40 is sequentially multiple-transferred to the transfer belt 50 in the transfer unit 32.

On the other hand, the sheet member P transported through the transport path 16 is transported to the transfer unit 32 at the same timing as the multiple transfer of each toner image to the transfer belt 50. Then, the toner image multiplex-transferred on the transfer belt 50 is transferred onto the sheet member P conveyed to the transfer unit 32.

Subsequently, the sheet member P to which the toner image is transferred is conveyed to the fixing device 34. Then, in the fixing device 34, the toner image is heated and pressurized to be fixed to the sheet member P. The sheet member P on which the toner image is fixed is discharged from a discharge unit (not shown).

<Structure and basic operation of developing equipment>
Next, the developing device 46 will be described in detail. Since the developing device 46 for each color has the same structure, one developing device 46 will be described below as an example.

As shown in FIG. 4, the developing device 46 is a device in which the device depth direction X (direction from the front side to the back side of the paper surface in FIG. 1) of the image forming device 10 is the longitudinal direction.
As shown in FIG. 5, the developing apparatus 46 includes a housing 46A, which opens into a housing portion 70 for accommodating the developer G and the auger 74 and a side wall portion 72 of the housing unit 70, which will be described later. The discharge unit 90 and the discharge unit 90 are included.

As shown in FIG. 4, the accommodating portion 70 has a device depth direction X in the longitudinal direction. One end of the accommodating portion 70 in the longitudinal direction (the end on the front side in the depth direction of the device X) is a cylindrical portion 70A. Further, the tubular portion 70A is provided with a tubular supply port 78 projecting upward toward the device. The inside of the supply port 78 is connected to the inside of the tubular portion 70A, and the developer G supplied from the toner cartridge 28 is supplied to the accommodating portion 70 and the accommodating portion 80 described later.

The auger 74 is provided in the accommodating portion 70 with the longitudinal direction of the accommodating portion 70 (the same direction as the device depth direction X) as the rotation axis direction (indicated by the arrow X in the figure). The auger 74 is rotated by a driving force from a driving source (not shown), and conveys the developer G in the accommodating portion 70 in the rotation axis direction X while stirring. In the present embodiment, the developer G is conveyed from the back side to the front side in the depth direction X of the apparatus by the rotation of the auger 74. Here, the auger 74 is an example of a transport member.

Further, as shown in FIG. 5, an accommodating portion 80 having an apparatus depth direction X in the longitudinal direction is provided below the apparatus of the accommodating portion 70. The accommodating portion 70 and the accommodating portion 80 are connected to each other through a passage portion (not shown) provided between the supply port 78 and the discharge port 92 in the device depth direction X.

One end of the accommodating portion 80 in the longitudinal direction (the end on the front side in the depth direction of the device X) is a cylindrical portion 80A. Further, the auger 82 is rotatably provided in the accommodating portion 80 with the longitudinal direction of the accommodating portion 80 (the same direction as the device depth direction X) as the rotation axis direction. The auger 82 is rotated by a driving force from a driving source (not shown), and conveys the developer G in the accommodating portion 80 in the rotation axis direction while stirring. In the present embodiment, the developer G that has flowed from the accommodating portion 70 through the passage portion is conveyed from the front side to the back side of the device depth direction X by the rotation of the auger 82.

Further, the accommodating portion 70 and the accommodating portion 80 are connected to each other through another passage portion (not shown) even at the end portion on the inner side in the depth direction X of the device. The developer G conveyed by the auger 82 in the accommodating portion 80 moves to the accommodating portion 70 through another passage portion. The developer G that has moved to the accommodating portion 70 is conveyed by the auger 74 toward the front side in the depth direction X of the apparatus. That is, the inside of the accommodating portion 70 and the inside of the accommodating portion 80 form a circulation path for the developer G through the passage portion and other passage portions. The developer G in the accommodating portion 70 is sent to the developing roll 47 to develop the electrostatic latent image of the image holder 40.

At the front end of the device depth direction X of the auger 74, the direction of the spiral of the blade (not shown) is opposite, and the new developer G supplied from the supply port 78 conveys the accommodating portion 70 in the transport direction. It is stirred with the old developer G (developer for which toner has been consumed) transported from the back side to the front side, and moves to the accommodating portion 80 (cylindrical portion 80A) through the passage portion.

<Structure of main parts>
Here, the discharge portion 90 of the developing apparatus 46, which is a main part of the present invention, will be described with reference to FIGS. 5 to 8.

[Discharge section]
As shown in FIG. 5, the discharge portion 90 is arranged on the side wall portion 72 in the device width direction W of the accommodating portion 70. Specifically, the discharge unit 90 includes a discharge port 92, an overhanging wall 94, a magnet 96, a film 98, and a discharge outlet 92E.

(Vent)
As shown in FIGS. 5 to 8, the discharge port 92 is an opening that penetrates the side wall portion 72 of the accommodating portion 70 in a direction (device width direction W) orthogonal to the rotation axis direction (device depth direction X) of the auger 74. It is a quadrangular opening when viewed from the side of the side wall portion 72 in the device width direction W.
When viewed from the side of the device width direction W, the discharge port 92 has an upper side 92A along the device depth direction X, a left side 92B and a right side 92C extending downward along the device height direction H from both ends of the upper side 92A, and a left side. A lower side 92D connecting the 92B and the lower end of the right side 92C is provided.
Further, on the lower side 92D of the discharge port 92, a lower surface 72C corresponding to the thickness from the inner surface 72A to the outer surface 72B of the side wall portion 72 is formed.
The width dimension of the upper side 92A and the lower side 92D is L1, and the height dimension of both the left side 92B and the right side 92C is L2.
Here, the lower surface 72C is an example of the lower edge, and the discharge port 92 is an example of an opening.

(Overhanging wall)
As shown in FIGS. 6 to 8, the overhanging wall 94 includes an upper surface portion 94A, a protruding end portion 94B, an inclined surface portion 94C, a left side surface portion 94D, and a right side surface portion 94E.
The upper surface 94A extends along the device depth direction X at the lower side 92D of the discharge port 92, and
It protrudes in the device width direction W. The protruding end of the upper surface 94A is a protruding end portion 94B.
Further, as shown in FIG. 8, the upper surface 94A is continuous with the lower surface 72C of the discharge port 92 and forms one flat surface.
The inclined surface portion 94C is formed so as to be inclined from the protruding end portion 94B of the upper surface 94A toward the lower side in the height direction H of the device so as to gradually approach the side wall portion 72.
The left side surface portion 94D and the right side surface portion 94E are surface portions surrounded by edges of the upper surface portion 94A, the side wall portion 72, and the inclined surface portion 94C at both ends of the inclined surface portion 94C in the device depth direction X.
Here, the overhanging wall 94 is an example of the overhanging portion.

Further, as shown in FIG. 7, the inner side of the device depth direction X on the upper surface 94A extends along the outer surface 72B of the side wall portion 72 beyond the right side 92C of the discharge port 92.

〔magnet〕
As shown in FIGS. 6 to 8, the magnet 96 has a rectangular parallelepiped shape and includes a contact angle portion 96A, an upper surface 96B, a left end portion 96C, and a right end portion 96D.
The contact angle portion 96A is a corner portion on the upper side of the magnet 96 and on the side opposite to the side of the discharge port 92, and the contact portion 98E set on the inner surface 98A of the lower end portion 98D which is the other end of the film 98 described later is provided. Contact.
The upper surface 96B is the upper surface of the rectangular magnet 96, the left end 96C is the front end of the device depth direction X in the magnet 96, and the right end 96D is the device depth direction X in the magnet 96. It is the end on the back side.
The magnet 96 is fixed to the upper surface 94A of the overhanging wall 94 in such a manner that the longitudinal direction of the magnet 96 is along the device depth direction X of the upper surface 94A.
The length of the magnet 96 in the longitudinal direction is L4. Further, the length in the lateral direction orthogonal to the longitudinal direction has a dimension that matches the overhanging dimension of the upper surface 94A of the overhanging wall 94, and the lower corner portion of the contact angle portion 96A is the protruding end portion of the upper surface 94A. It is arranged so as to be aligned with 94B.

Further, as an example, the magnet 96 is provided with N poles and S poles on both ends in the depth direction X of the device.
As another example, the magnet 96 may be provided with N poles and S poles on both ends in the device height direction H of the magnet 96, and N poles and N poles may be provided on both ends of the device width direction W of the magnet 96. It may be provided with an S pole.

(the film)
As shown in FIG. 8, the film 98 is a thin plate-shaped member, and has an inner surface 98A, an outer surface 98B, an upper end portion 98C, a lower end portion 98D, a contact portion 98E, a left end portion 98F, and a right end portion. It is configured to include 98G.

The film 98 is provided so that the contact portion 98E comes into contact with the magnet 96 in a state of being elastically bent and deformed.
Specifically, this bending deformation is bent and deformed in a direction that is convex toward the discharge port 92, and the contact portion 98E on the inner surface of the film 98 is pressed against the contact angle portion 96A of the magnet 96.
At this time, the contact portion 98E of the film 98 and the contact angle portion 96A of the magnet 96 are in contact with each other because the film 98 is elastically bent and deformed toward the discharge port 92 in a convex direction. Is maintained.

Further, the film 98 vibrates while maintaining contact with the magnet 96 when the developer G having a higher position than the lower surface 72C of the discharge port 92 is discharged from the accommodating portion 70.
This is because the developer G discharged from the discharge port 92 presses the inner surface 98A of the film 98 through the developer G deposited between the discharge port 92 and the inner surface 98A of the film 98. This is because the elastic force of 98 fluctuates and acts on the film 98 as vibration.

Further, the film 98 is in contact with the magnet 96 in a non-fixed state in a cantilever state in which the lower end portion 98D, which is the other end, is a free end.
As a result, at the lower end portion 98D of the film 98, the contact portion 98E in contact with the magnet 96 and the contact angle portion 96A of the magnet 96 can move to each other in a contact state, so that the film is pressed by the developer G. In 98, vibration is promoted.

Specifically, the upper end portion 98C of the film 98 is fixed to the outer surface 72B of the side wall portion 72 located above the upper side 92A of the discharge port 92 with an adhesive or the like.
Further, on the side of the lower end portion 98D which is the free end of the other end of the film 98, as described above, the contact portion 98E set on the inner surface 98A of the lower end portion 98D is in a fixed state to the contact angle portion 96A of the magnet 96. Are in contact with.

The width dimension of the film 98 (dimensions of the upper end portion 98C and the lower end portion 98D) is L3.
Here, the film 98 is an example of a covering member.

As the film 98, the film 98 having elasticity is used in this embodiment. The film 98 is made of a synthetic resin material, and a film having a thickness of 30 μm or more and 100 μm or less is preferably used.
FIG. 9 shows the change in the amount of displacement of the film 98 with respect to the thickness of the film 98. The displacement amount of the film 98 is the amplitude when the film 98 vibrates.
As shown in FIG. 9, when the thickness of the film 98 is less than 30 μm, the displacement amount of the film 98 is as large as about 60 μm. Then, the film 98 is bent and deformed in the direction of being convex toward the discharge port 92 due to the pressing force of the developer G, and is deformed in the direction of being convex on the contrary, or the contact portion 98E is the magnet 96. It may float away from the contact angle portion 96A.
Further, when the thickness of the film 98 exceeds 100 μm, the displacement amount of the film 98 is reduced to about 30 μm, the vibration (amplitude) of the film 98 due to the pressing of the developer G is reduced, and the discharge of the developer G is poor. It is more likely to occur.
In this embodiment, a 100 μm film is used.

(Discharge outlet)
As shown in FIG. 8, the discharge outlet 92E is a space surrounded by the discharge port 92, the film 98, and the overhanging wall 94, and this space is the overhanging wall 94 when viewed from the device depth direction X. The side of is a triangle with the base.
Specifically, the discharge outlet 92E includes the opening surface 72D (position indicated by a virtual line in FIG. 8) of the discharge port 92 on the outer surface 72B of the side wall portion 72, the inner surface 98A of the film 98, and the upper surface of the overhanging wall 94. It is a space surrounded by 94A.
Further, as shown in FIGS. 6 to 8, the discharge outlets 92E are open on both sides in the depth direction X of the device. One of the discharge outlets 92E is open to the left end 98F side of the film 98, and the other is open to the right end 98G side of the film 98.

[Mutual positional relationship between outlet, magnet and film]
Here, the mutual positional relationship between the discharge port 92, the magnet 96, and the film 98 will be described.
Each positional relationship will be described on the side of the device width direction W, that is, a state in which the side wall portion 72 of the accommodating portion 70 is viewed from the front.

(Position relationship between outlet and magnet)
As shown in FIG. 7, the magnet 96 is arranged over the opening range of the discharge port 92 in the device depth direction X.
Further, one end of the magnet 96 protrudes from the discharge port 92 in the device depth direction X.
Specifically, the longitudinal dimension (dimension along the device depth direction X) L4 of the magnet 96 is longer than the width dimension L1 of the discharge port 92, and the right end portion 96D of the magnet 96 is larger than the right side 92C of the discharge port 92. It protrudes toward the device depth direction X.
The positional relationship is such that the left side 92B of the discharge port 92 and the left end 96C of the magnet 96 are aligned in the device depth direction X, and the right end 96D of the magnet 96 is a device more than the right side 92C of the discharge port 92 by the dimension L4A. It is said to be a position that becomes longer in the depth direction X.

(Position relationship between outlet and film)
As shown in FIG. 7, the film 98 has dimensions that cover the discharge port 92 when viewed from the device width direction W.
Specifically, the width dimension L3 along the device depth direction X of the fill also 98 is larger on one side by the dimension L3B than the width dimension L1 along the device depth direction X of the discharge port 92.
Further, the height dimension projected in the device height direction H of the film 98 is larger than the height dimension L2 of the discharge port 92. The upper end portion 98C of the film 98 is extended to a position higher than the upper side 92A of the discharge port 92 so that it can be fixed to the outer surface 72B of the side wall portion 72 of the accommodating portion 70 located above the discharge port 92.
Further, the lower end portion 98D of the film 98 is extended downward by the dimension L3A from the contact angle portion 96A of the magnet 96 located outside the discharge port 92 (device width direction W).

(Position relationship between magnet and film)
As shown in FIG. 7, one end of the magnet 96 protrudes from the film 98 in the device depth direction X.
Specifically, the right end portion 96D of the magnet 96 protrudes from the edge portion of the right end portion 98G of the film 98 toward the back side in the device depth direction X by the dimension L4B.
Therefore, the dimension L4A is the sum of the dimension L4B and the dimension L3B.

On the other hand, the left end portion 96C of the magnet 96 is positioned so as to be aligned with the left side 92B of the discharge port 92, and is a position where the left end portion 98F of the film 98 is inserted into the depth side of the device depth direction X by the dimension L3B. It is said that.

<Action of the main part>
Here, the operation of the discharge unit 90, which is the main part of the present embodiment, will be described in detail while comparing with the developing apparatus of the comparative example.

The discharge section of the developing apparatus of the comparative example (not shown) includes a discharge port and a covering member that covers the front surface of the discharge port, and does not include an overhanging wall and a magnet.
In such a configuration, a part of the developer G that bounces in the accommodating portion collides with the inner surface of the covering member from the discharge port, but a part of the developer is discharged from the discharge port, and as a result, the developer in the accommodating portion. Excessive emission of G cannot be sufficiently suppressed.

In the present embodiment, as shown in FIG. 5, in the accommodating portion 70 of the developing apparatus 46, when the developer G is stirred by the rotation of the auger 74 provided in the accommodating portion 70 in the direction of the arrow A, the developing agent G is developed. A part of the agent G jumps in the accommodating portion 70, and a part thereof heads toward the discharge port 92 of the discharge unit 90 (in the figure, in the direction of arrow B).
When the jumping developer G passes through the discharge port 92, it collides with the inner surface 98A of the film 98 and is attracted by the magnetic force of the magnet 96. As shown in FIG. 8, the upper surface 96B of the magnet 96 and the upper surface of the overhanging wall 94. It gradually accumulates on top of 94A.
As shown in FIG. 8, as the accumulation of the developer G progresses, it is accumulated on the front surface of the discharge port 92 surrounded by the upper surface 96B of the magnet 96, the upper surface 94A of the overhanging wall 94, and the inner surface 98A of the film 98. The discharge port 92 is blocked by the developer G.

Further, on the side close to the upper side 92A of the discharge port 92 shown in FIG. 8, the magnetic force of the magnet 96 is small due to the distance from the magnet 96. However, since the discharge outlet 92E has a triangular shape with the upper surface 94A of the overhanging wall 94 as the base, it is possible to hold the developer G that has jumped to the side far from the magnetic force of the magnet 96 of the discharge port 92. can.
As a result, the developer G that is about to bounce and diffuse in the accommodating portion 70 is suppressed from being discharged from the discharge port 92.
As a result, the discharge exceeding the discharge due to the rise of the developer G in the accommodating portion 70, that is, the excessive discharge is suppressed.

Further, the high level of the developer G rises in the accommodating portion 70, exceeds the predetermined high level F of the developer G shown in FIG. 5, and exceeds the upper surface 94A of the overhanging wall 94, which is the lower end of the discharge port 92. Then, the developer G in the accommodating portion 70 moves toward the discharge port 92.
Then, due to the magnetic force of the magnet 96, the developer G stored in the discharge port 92E surrounded by the discharge port 92, the upper surface 94A of the overhanging wall 94, and the inner surface 98A of the film 98 is collected from the inside of the accommodating portion 70. It is pushed by the discharged developer G.
As a result, the film is pressed in the direction of arrow B shown in FIG. 5 by the developer G stored in the discharge outlet 92E, and the pressing force causes the film 98 to vibrate in the direction of arrow B.

When the film 98 vibrates, the device of the triangular discharge outlet 92E surrounded by the outer surface 72B of the side wall portion 72 at the position of the discharge port 92, the inner surface 98A of the film 98, and the upper surface 96B of the magnet 96, as shown in FIG. The developer G is discharged from one open end in the depth direction X.

Further, as shown in FIG. 8, the magnetic force of the magnet 96 is small on the side close to the upper side 92A of the discharge port 92 because the distance from the magnet 96 is large. As a result, when the film 98 is vibrated by the developer G, the film 98 is discharged first from the developer G accumulated in the upper part of the triangular discharge outlet 92E. At this time, due to the vibration of the film 98, the developer G is discharged without being solidified.

Further, the magnet 96 protrudes from the right end of the discharge port toward the device depth direction X, and protrudes from the right end portion 98G of the film 98.
On the protruding side, the developing agent G is accumulated more than the side of the left end portion 98F of the film 98 due to the magnetic force of the protruding magnet 96, and the accumulated developer G is increased to the extent that the normal developing agent G is increased. Is not discharged and remains blocked at the discharge port.
As a result, the developer G is mainly discharged from one side of the discharge outlet 92E.
In the present embodiment, the developer G is discharged from the front side of the device depth direction X of the discharge outlet 92E, that is, the side of the left side 92B of the discharge port 92 shown in FIG.

The developer G discharged from the discharge section 90 heads for a discharge path including a cover and a discharge tube (not shown) covering the discharge section 90, and is accommodated again from this discharge path by a transport mechanism (not shown). It is designed to be returned to the part 70.

As described above, the present embodiment has the following configurations and effects.

The developing device 46 in the present embodiment includes an accommodating portion 70 that accommodates an auger 74 that rotates and conveys a developer G, an discharge port 92 that opens laterally when viewed from the axial direction of the auger 74, and the discharge port 92. The housing 46A is provided with an overhanging wall 94 that projects from below the housing portion 70 to the outside.
In addition, the developing device 46 includes a magnet 96 which is an outer surface of the housing 46A and is arranged outside the discharge port 92 from the opening surface 72D of the discharge port 92 and is supported by the overhanging wall 94.
Further, in the developing device 46, one end is fixed above the discharge port 92 in the housing 46A, and the other end is in contact with the magnet 96 with the contact portion 98E on the side of the discharge port 92. It is provided with a film 98 covering the above.
As a result, the excessive discharge of the developer G due to the splash can be suppressed as compared with the case where the developer G splashed up by the auger 74 is suppressed from being discharged only by the member covering the discharge port 92.

Further, in the developing apparatus of the present embodiment, the accommodating portion 70 accommodating the auger 74 that rotates and conveys the developer G, the discharge port 92 that opens laterally when viewed from the axial direction of the auger 74, and the discharge port. The housing is provided with an overhanging wall 94 that projects from below the 92 to the outside of the accommodating portion 70.
In addition, the developing device 46 includes a magnet 96 which is an outer surface of the housing 46A and is arranged outside the discharge port 92 from the opening surface 72D of the discharge port 92 and is supported by the overhanging wall 94.
In addition, the developing device 46 has the following configuration.
One end is fixed above the discharge port 92 in the housing 46A, and the other end covers the discharge port 92 and jumps inside the accommodating portion 70 with the surface on the side of the discharge port 92 in contact with the magnet 96. A film 98 that guides the developer G from the discharge port 92 to the side of the magnet 96.
As a result, the excessive discharge of the developer G due to the splash can be suppressed as compared with the case where the developer G splashed up by the auger 74 is suppressed from being discharged only by the member covering the discharge port 92.

Further, the developing apparatus 46 in the present embodiment has an accommodating portion 70 accommodating an auger 74 that rotates and conveys the developer G, an discharge port 92 that opens laterally when viewed from the axial direction of the auger 74, and the ejection port 92. The housing 46A is provided with an overhanging wall 94 projecting from below the outlet 92 to the outside of the accommodating portion 70.
In addition, the developing device 46 includes a magnet 96 which is an outer surface of the housing 46A and is arranged outside the accommodating portion 70 from the opening surface 72D of the discharge port 92 and is supported by the overhanging wall 94.
In addition, the developing device 46 has the following configuration.
One end is fixed above the discharge port 92 in the housing 46A, and the other end covers the discharge port 92 with the surface on the side of the discharge port 92 in contact with the magnet 96, and the higher position is the upper surface of the discharge port 92. A film 98 that vibrates in contact with a developer G exceeding 94A.
As a result, the developer G splashed up by the auger 74 is jumped as compared with the one in which the discharge is suppressed only by the member covering the discharge port 92 and the one in which the discharge is suppressed only by the member covering the discharge port 92. It is possible to suppress the excessive discharge of the developer G due to the above.
In addition, the developer G whose high level exceeds the upper surface 94A of the overhanging wall 94 at the discharge port 92 can be discharged.

Further, the film 98 in the present embodiment is a thin plate-shaped member, and the contact portion 98E of the lower end portion 98D is in contact with the magnet 96 in a state of being elastically bent and deformed.
This makes it possible to suppress excessive discharge of the developer G due to splashing, as compared with a configuration in which the film 98 is in contact with the magnet 96 in a free state.

Further, the film 98 in the present embodiment is bent and deformed in a direction that is convex toward the discharge port 92.
As a result, the film 98 that comes into contact with the magnet 96 in a bent state can be formed by the flat thin plate-shaped member.

Further, the film 98 in the present embodiment maintains contact with the magnet 96 when the developer G having a higher level than the upper surface 94A of the overhanging wall 94 at the discharge port 92 is discharged from the accommodating portion 70. It vibrates.
As a result, when the developer G having a higher rank than the upper surface 94A of the discharge port 92 is discharged from the accommodating portion 70, the discharge port 92, the film 98, and the overhanging wall 94 are compared with the configuration in which the film 98 does not vibrate. Discharge of the developer G from the discharge outlet 92E surrounded by is promoted.

Further, the film 98 in the present embodiment is in a cantilevered support state in which the lower end portion 98D is a free end, and is in contact with the magnet 96 in a non-fixed state.
As a result, the discharge of the developer G from the discharge port 92E surrounded by the discharge port 92, the film 98, and the overhanging wall 94 is promoted as compared with the configuration in which the lower end portion 98D of the film 98 is fixed to the magnet 96. Ru.

Further, the magnet 96 in the present embodiment extends along the device depth direction X and is arranged over the opening range of the discharge port 92 in the device depth direction X.
As a result, excessive discharge of the developer G due to splashing is suppressed as compared with the configuration in which the magnet 96 is arranged only in a part of the opening range of the discharge port 92 in the depth direction X of the device.

Further, the magnet 96 in the present embodiment has one end protruding from the discharge port 92 in the device depth direction X.
As a result, the discharge of the developer G from one side of the discharge port 92 in the device depth direction X is promoted as compared with the configuration in which the magnet 96 is arranged so as to protrude from both ends of the opening range of the discharge port 92 in the device depth direction X. Will be done.

Further, one end of the magnet 96 in the present embodiment protrudes from the film 98 in the device depth direction X.
As a result, the discharge of the developer G from one side of the film 98 in the device depth direction X is promoted as compared with the configuration in which the magnets 96 are arranged so as to protrude from both ends of the film 98 in the device depth direction X.

Further, in the developing apparatus of the present embodiment, the discharge outlet 92E surrounded by the discharge port 92, the film 98, and the overhanging wall 94 has a triangular shape in which the side of the overhanging wall 94 forms a base when viewed from the device depth direction X. It is what has been done.
As a result, by forming the discharge outlet 92E into a narrow triangular shape upward, it is possible to hold the developer that has jumped to the side far from the magnetic force of the magnet 96 at the discharge outlet 92E.

Further, the overhanging wall 94 in the developing apparatus of the present embodiment extends horizontally along the lower edge of the discharge port 92, and the magnet 96 is mounted on the upper surface 94A of the overhanging wall 94.
As a result, more of the jumping developer can be retained as compared with the configuration in which the upper surface 96B of the magnet 96 and the lower edge of the discharge port 92 are aligned in the vertical direction.

Further, the magnet 96 in the developing apparatus of the present embodiment has a rectangular shape when viewed from the depth direction X of the apparatus, and has a contact portion 98E at the lower end portion 98D of the film 98 at a corner portion on the upper side and opposite to the side of the discharge port 92. Are in contact with each other.
As a result, when viewed from the device depth direction X, excessive discharge of the developer G from the discharge port 92E surrounded by the discharge port 92, the film 98, and the overhanging wall 94 is suppressed as compared with the configuration provided with the round magnet. Ru.

Further, the assembly of the present embodiment includes an image holder 40 on which a latent image is formed, and a developing device 46 for developing a latent image formed on the outer peripheral surface of the image holder 40 as a toner image, and an image. It is assembled so as to be replaced integrally with the forming device main body 10A.
As a result, image unevenness in the toner image on the image holder can be suppressed as compared with the one without the developing apparatus of the present embodiment.

Further, the image forming apparatus 10 of the present embodiment has the following configuration.
The image holder 40, the charger 42 that charges the outer peripheral surface of the image holder 40, the exposure device 44 that forms a latent image on the outer peripheral surface of the image holder 40 charged by the charger 42, and the toner for the latent image. A developing device 46 that develops an image, and a transfer unit 32 that transfers a toner image to a sheet member P.
As a result, image unevenness in the output image can be suppressed as compared with the one without the developing apparatus of the present embodiment.

The embodiments of the present invention have been described above with reference to the embodiments, but these embodiments are examples, and various modifications can be made without departing from the gist, and the scope of rights of the present invention is these. Needless to say, it is not limited to the embodiment of.

For example, it has been explained that the magnet 96 is mounted on the upper surface 94A of the overhanging wall 94, but the magnet 96 may be partially or wholly embedded in the upper surface 94A of the overhanging wall 94. The upper surface 94A of the overhanging wall 94 may be provided with a plurality of steps.

Further, the upper surface of the magnet 96 is shown in the same direction as the upper surface 94A of the overhanging wall 94 in the device width direction W when viewed from the device depth direction X, but the upper surface of the magnet 96 is shown in the device depth direction X. It may be provided in a state of being inclined in the device width direction W.

Further, although it has been explained that the magnet 96 has a rectangular parallelepiped shape when viewed from the device depth direction X, the magnet 96 is not limited to this, and may be various polygonal shapes such as a triangular shape and a trapezoidal shape, and may be a circular shape or an elliptical shape. May be good.

Further, the magnet 96 has been described as one having a rectangular shape extending in the depth direction X of the device, but the magnet 96 may have a plurality of magnets 96 arranged along the depth direction X of the device. A magnetic material (iron plate or the like) may be combined with the magnet 96.

Further, although the surface of the magnet 96 facing the discharge port 92 has been described so as to be aligned with the opening surface 72D of the discharge port 92, there is a gap between the surface of the magnet 96 facing the discharge port 92 and the opening surface 72D. May be provided.

Further, it has been explained that the film 98 is a thin plate made of synthetic resin, but the film 98 is not limited to this, and if it is a thin plate and is a material that vibrates when pressed by the developer G, metal, wood, etc. , Known materials may be used.

Further, it was explained that the positional relationship between the discharge port 92 of the magnet 96 and the film 98 protrudes toward the depth side of the device depth direction X from the discharge port 92 and the film 98.
However, in consideration of the discharge direction of the developer G, the protrusion direction of the magnet 96 with respect to the discharge port 92 and the film 98 may be reversed.
Further, when discharging from both sides of the discharge outlet 92E is allowed, the positional relationship at the right end portion 98G may be the same as the positional relationship at the left end portion 98F side (the magnet 96 does not protrude on both sides).

Further, although it has been described that the thickness of the film 98 is in the range of 30 μm or more and 100 μm or less, an appropriate numerical value may be set according to the material and size of the film 98.

10 Image forming apparatus 10A Image forming apparatus main body 32 Transfer unit (example of transfer apparatus)
40 Image holder 42 Charger (example of charging device)
44 Exposure device (an example of latent image forming device)
46 Developing device 46A Housing 70 Housing 70A Cylindrical part 72 Side wall part 72A Inner surface 72B Outer surface 72C Lower surface 72D Opening surface 74 Auger (example of transport member)
90 Discharge section 92 Discharge port (example of opening)
94 Overhanging wall (an example of overhanging part)
96 Magnet 98 film (an example of covering member)
G Developer F Predetermined high-level P sheet member (an example of transferred body)

Claims (15)

In a developing device that contains a magnetic carrier and toner and develops an electrostatic latent image formed on the surface of an image holder as a toner image using a developer sent to a developing roll .
A developing roll that develops an electrostatic latent image and
An accommodating portion for accommodating a transport member that rotates and conveys the developer in the direction of the axis of rotation . A housing having an opening to be formed and an overhanging portion extending from below the opening to the outside of the accommodating portion.
A magnet supported by the overhang on the outside of the housing with respect to the opening surface of the opening.
A covering member that covers the opening with one end fixed above the opening in the housing and the other end in contact with the magnet from the side opposite to the side of the opening.
A developing device equipped with. In a developing device that contains a magnetic carrier and toner and develops an electrostatic latent image formed on the surface of an image holder as a toner image using a developer sent to a developing roll .
A developing roll that develops an electrostatic latent image and
An accommodating portion for accommodating a transport member that rotates and conveys the developer in the direction of the axis of rotation . A housing having an opening to be formed and an overhanging portion extending from below the opening to the outside of the accommodating portion.
A magnet supported by the overhang on the outside of the housing with respect to the opening surface of the opening.
One end is fixed above the opening in the housing, and the other end is in contact with the magnet from the side opposite to the side of the opening to cover the opening and inside the housing. A covering member that guides the splashed developer from the opening toward the magnet.
A developing device equipped with. In a developing device that contains a magnetic carrier and toner and develops an electrostatic latent image formed on the surface of an image holder as a toner image using a developer sent to a developing roll .
A developing roll that develops an electrostatic latent image and
An accommodating portion for accommodating a transport member that rotates and conveys the developer in the direction of the axis of rotation . A housing having an opening to be formed and an overhanging portion extending from below the opening to the outside of the accommodating portion.
A magnet supported by the overhang on the outside of the housing with respect to the opening surface of the opening.
One end is fixed above the opening in the housing, and the other end is in contact with the magnet from the side opposite to the side of the opening to cover the opening and the higher position is the opening. A covering member that vibrates in contact with the developer beyond the lower edge,
A developing device equipped with. The covering member is a thin plate-shaped member, and the other end thereof is in contact with the magnet in a state of being elastically bent and deformed.
The developing apparatus according to any one of claims 1 to 3. The developing apparatus according to claim 4, wherein the covering member is bent and deformed in a direction that is convex toward the opening. The covering member vibrates while maintaining contact with the magnet when the developer whose height is higher than the lower edge of the opening is discharged from the accommodating portion.
The developing apparatus according to any one of claims 1 to 5. The covering member is in contact with the magnet in a non-fixed state in a cantilevered support state in which the other end is a free end.
The developing apparatus according to claim 6. The magnet extends along the axial direction and is arranged over the opening range of the opening in the axial direction.
The developing apparatus according to any one of claims 1 to 7. Only one end of the magnet protrudes from the opening in the axial direction.
The developing apparatus according to claim 8. Only one end of the magnet protrudes from the covering member in the axial direction.
The developing apparatus according to claim 9. The space surrounded by the opening surface, the covering member, and the overhanging portion has a triangular shape in which the side of the overhanging portion forms a base when viewed from the axial direction.
The developing apparatus according to any one of claims 1 to 10. The overhang extends horizontally along the lower edge of the opening, and the magnet rests on the upper surface of the overhang.
The developing apparatus according to any one of claims 1 to 11. The magnet has a rectangular shape when viewed from the axial direction, and the other end of the covering member is in contact with a corner portion on the upper side and opposite to the side of the opening.
The developing apparatus according to claim 12. An image holder on which a latent image is formed, and
The developing apparatus according to any one of claims 1 to 13.
Including
An assembly assembled to be replaced integrally with the image forming apparatus body. Image holder and
A charging device that charges the outer peripheral surface of the image holder, and
A latent image forming device that forms a latent image on the outer peripheral surface of the image holder charged by the charging device, and a latent image forming device.
The developing apparatus according to any one of claims 1 to 13.
A transfer device that transfers the toner image to the transfer target,
An image forming apparatus equipped with.

Images