JP3056194B1 - Wet image forming apparatus and printing apparatus - Google Patents

Abstract

The present invention relates to a wet-type image forming apparatus capable of forming an image satisfactorily from an initial stage of image formation with a simple configuration without causing contamination. SOLUTION: A developer blade 2 whose leading edge is in contact with a belt-like photoreceptor B is provided below a developer roller 1 for supplying a liquid developer to the photoreceptor B for development. Below the development blade 2,
A resilient brush roller 3 is provided which is in constant contact with the development roller 1 and the development blade 2. A reservoir 5 for storing the liquid developer T in a substantially box shape having an open upper surface is provided to accommodate the brush roller 3. A liquid developer scattering prevention plate 6 is disposed on the rotation direction side of the brush roller 3 from the contact portion between the brush roller 3 and the development roller 1 to the leading edge of the development blade 2. Liquid developer T in reservoir 5 at the beginning of printing
The contact portion between the developing roller 1 and the brush roller 3 is not soaked, and even if the liquid developer T scatters due to elasticity, the liquid developer T hits the liquid developer scattering prevention plate 6 and does not stain the surroundings.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wet type image forming apparatus and a printing apparatus provided with an elastic rotating member for removing a liquid developer from a developing roller for supplying a liquid developer to a photoreceptor and developing the same.

[0002]

2. Description of the Related Art Conventionally, as a wet image forming apparatus such as a copying machine, a printer, a facsimile, etc.
As described in JP-A-30-30190 and JP-A-8-15995, a latent image is formed on the photosensitive member by an electrophotographic process or the like, and a liquid developing solution is supplied by a developing device. Various configurations for visualizing a latent image on the surface of a photoconductor and transferring the latent image to a transfer material are known.

[0003] Japanese Patent Application Laid-Open No. 4-30190 discloses a liquid drain portion which contacts the surface of a rotating body for removing excess developer which moves from the lowermost portion to a portion facing the surface of the photoreceptor. ing. Then, when the rotating body for removing excess developer stops when the transfer operation is stopped, the developer accumulated between the photosensitive member and a developing member such as a developing roller travels along the surface of the rotating body for removing excess developer. A configuration is adopted in which the liquid is removed by a liquid draining part when flowing down toward the lower part, and is prevented from accumulating on a rotating body for removing excess developer, thereby preventing transfer paper from being stained during transfer.

Japanese Patent Application Laid-Open No. 8-15995 discloses a transfer charger having a variable transfer current provided on a surface voltmeter disposed between a developing device and a transfer portion so as to face the surface of a photosensitive drum. A control unit such as a microprocessor to which a power supply circuit is connected is connected. A temperature measuring device for measuring the temperature of the developing solution contained in the developing solution tank; a heater for adjusting the temperature in the developing device; a temperature measuring device for measuring the temperature of the photosensitive drum; Is provided. The temperature of the developing solution or the photosensitive drum is appropriately adjusted by a heater based on the temperature measured by the temperature measuring device, so that a relatively thick film adheres to the surface of the photosensitive drum when the temperature of the developing solution is low. A configuration is adopted in which the developer conveyed to the transfer area is prevented from accumulating in the contact portion between the transfer belt and the photosensitive drum and soiling the transfer material on the transfer belt.

[0005]

However, Japanese Patent Application Laid-Open Nos. Hei 4-30190 and Hei 8-15995 describe above.
In a conventional wet-type image forming apparatus as described in Japanese Patent Application Laid-Open Publication No. H11-157, printing, transfer, Since the member that removes excess developer is not immersed in the developer at the initial stage of the image forming operation, the developer scatters from the developing roller due to elastic force, thereby contaminating peripheral members such as the photoconductor, and forming. There is a problem that the obtained image may be stained.

An object of the present invention is to provide a wet image forming apparatus and a printing apparatus capable of forming an image without contamination from the initial stage of image formation with a simple configuration. .

[0007]

According to a first aspect of the present invention, there is provided a wet image forming apparatus, comprising: a developing roller for supplying a liquid developer to a photosensitive member which is moved by rotation and developing the photosensitive member; A blade for removing the liquid developer adhering to the developing roller due to contact with the edge;
A brush roller having an elastic member on an outer peripheral surface for removing the liquid developer attached to the blade;
A liquid developer storage unit that houses a roller and stores at least the upper surface for storing the liquid developer, and is located on the moving direction side of the photoconductor with respect to the development roller and is in contact with the photoconductor.
Excess liquid adhering to the photoreceptor by following rotation
Wet roller with an excess developer removing roller for removing the body developer
In the image forming apparatus, the developing roller and the
Between the contact portion of the brush roller and the excess developer removing roller.
A liquid developer scattering prevention member disposed between the liquid developer and having an upper end located above a horizontal line passing through the center of the developing roller and a lower end located below a horizontal line passing through an opening edge of the liquid developer storage section ;
Characterized by comprising a. Further, the liquid developer scattering preventing body may be formed in a substantially plate shape by a plate-shaped metal member. Further, the liquid developer scattering preventing body may be formed in a substantially plate shape with a polyacetal resin. Also,
The liquid developer scattering prevention plate may be disposed at a distance of 1.5 mm or more from the developing roller and the liquid developer storage section. According to a fifth aspect of the present invention, there is provided a printing apparatus comprising: a movable photosensitive member; and the wet image forming apparatus according to any one of the first to fourth aspects.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the structure of a wet image forming apparatus of a printing apparatus according to an embodiment of the present invention will be described with reference to the drawings.

The printing apparatus includes a plurality of wet image forming apparatuses 10.
0, for example, in the case of color printing, three are provided corresponding to the liquid developers T of yellow, magenta, and cyan. As shown in FIGS. 1 to 6, the wet image forming apparatus 100 includes, for example, a photoconductor B formed in a belt shape.
A developing roller 1 is rotatably provided as a developing roller which is formed in a substantially cylindrical shape, for example, made of metal, and rotates in a predetermined direction for developing an electrostatic latent image formed thereon. The developing roller 1 develops an electrostatic latent image formed on a photoconductor by applying a developing voltage of, for example, +400 V during a developing operation. Then, the developing roller 1 is arranged at a very small distance from the photoconductor B,
For example, they are arranged so as to keep an interval of 150 μm, and are driven to rotate in a direction indicated by an arrow b in FIG.

Below the developing roller 1, a leading edge, which is one edge, is in sliding contact with the outer peripheral surface of the developing roller 1.
A developing blade 2 is provided as a blade portion for removing the toner particles T 'carried on the device. The development blade 2 is, for example, an Esterlam Internet
Ional brand Esterlam Doctor
Blade is formed in a substantially plate shape.

Further, below the developing blade 2, the circumferential surface is always in contact with the developing roller 1 and the developing blade 2, and the axial direction of removing the toner particles T ′ from the developing blade 2 by rotating is substantially the same dimension as the developing roller 1. A brush roller 3 serving as a rotary member is provided so that its axial direction is substantially parallel to the axial direction of the developing roller 1. The brush roller 3 is configured such that, for example, a roller portion formed of a nylon fiber to be a brush portion is integrally provided on an outer peripheral surface of a shaft (not shown) formed of a metal member. During the developing operation, the brush roller 3 is driven to rotate in a direction indicated by an arrow f in FIG. 2, that is, to rotate in the same direction as the developing roller 1 to remove the toner particles T ′ attached to the tip of the developing blade 2. remove. At the time of printing, substantially the same voltage as the developing voltage is applied.

Further, the wet image forming apparatus 100 is provided with a manifold 4 for supplying the liquid developer T to the peripheral surface of the developing roller 1. This manifold 4
The liquid developer T supplied from the photoconductor B is transported at a minute interval between the photoconductor B and the developing blade 1, and develops an electrostatic latent image formed on the photoconductor B.

The wet image forming apparatus 100 has a plate-like metal plate having an open upper surface for storing the liquid developer so that a portion where the brush roller 3 contacts the developing roller 1 is immersed in the liquid developer T during printing. A reservoir 5 is provided as a liquid developer storage portion formed of a member in a substantially box shape. The brush roller 3 is located in the reservoir 5, and the developing blade 2 is disposed so as to close a part of the opening on the upper surface of the reservoir 5. Further, the reservoir 5 is provided with a shield 7 for controlling the flow of the liquid developer T, that is, supplying a constant amount of the liquid developer T to the outer peripheral surface of the developing roller 1. At the time of printing, substantially the same voltage as the developing voltage is applied. The removal means is constituted by the developing blade 2, the brush roller 3 and the reservoir 5.

Further, the wet image forming apparatus 100 has a position close to the portion where the brush roller 3 and the developing roller 1 come into contact with each other from the opening on the upper surface of the reservoir 5 and faces the leading edge of the developing roller 2, that is, the brush. A liquid developer scattering prevention plate 6 formed of, for example, a plate-like metal member is provided on the rotation direction side of the roller 3 so as to cover a portion where the brush roller 3 and the development roller 1 are in contact with each other. I have. The liquid developer scattering prevention plate 6
Is a position where even if the liquid developer T attached to the brush roller 3 scatters, it is received on the side where the liquid developer T scatters, specifically, the upper end is located above a horizontal line passing through the center of the developing roller 1, and the lower end is located at the upper end of the reservoir 5. It is located below a horizontal line passing through the opening edge of a certain upper surface, and is located at a distance of, for example, 1.5 mm or more from the developer roller 1 and the reservoir 5. At the time of printing, substantially the same voltage as the developing voltage is applied.

In the wet image forming apparatus 100, the axial direction is substantially parallel to the axial directions of the developing roller 1 and the brush roller 3, and is located on the opposite side to the developing roller 1 via the liquid developer scattering prevention plate 6. There is provided a squeeze roller 8 which is provided in a substantially cylindrical shape whose axial direction is longer than that of the development roller 1. The squeeze roller 8 is configured such that a roller portion formed of urethane rubber is integrally provided on an outer peripheral surface of a shaft formed of, for example, a metal member. The squeeze roller 8 moves the photosensitive member B during printing.
The excess liquid developer T carried on the upper surface is squeezed, and the photoconductor B is cleaned immediately before the printing operation is stopped.

That is, during printing, the squeeze roller 8 is pressed against the photosensitive member B with a predetermined force, for example, 30 kgf, and is driven in the direction of arrow c in FIG. Then, the excess liquid developer T is squeezed out of the liquid developer T developed on the photosensitive member B. Immediately after the printing is completed and immediately before the entire printing apparatus stops, the printing apparatus is pressed against the photoconductor B with a weaker force than the printing, for example, 0.9 kgf, and is driven to rotate in a direction opposite to the direction of the arrow c, and the printing is performed. The liquid developer T accumulated in the gap between the photoconductor B and the squeeze roller 8 on the upstream side is removed from the contact portion between the photoconductor B and the squeeze roller 8 and the photoconductor B is cleaned.

Below the squeeze roller 8, a liquid developer T attached to the outer peripheral surface of the squeeze roller 8 is removed when one leading edge, which is one edge, can contact and separate from the squeeze roller 8, for example, urethane. A blade holding unit 10 is provided for holding a wiper blade 9 formed of rubber or the like, and for rotating a tip edge of the wiper blade 9 toward and away from the outer peripheral surface of the squeeze roller 8. In addition,
The wiper blade 9 is pressed while the squeeze roller 8 is cleaning the photosensitive member B, and removes the liquid developer T from the outer peripheral surface of the squeeze roller 8.

Further, the wet image forming apparatus 100 accommodates an urging means such as a compression coil spring for pressing the squeeze roller 8 against the photosensitive member B, and rotatably supports the squeeze roller 8 and the blade holding section 10.
And a squeeze support 11 that rotatably supports the developing roller 1 and a brush support 3 that rotatably supports the developing roller 1 and the brush roller 3.

Next, the operation of the above embodiment will be described with reference to the drawings.

First, when print data is input to the printing apparatus, the photosensitive member B moves in the direction of arrow a in FIG. 2 and is charged to a potential of, for example, about +750 V by a scorotron charger (not shown). . Then, by driving a liquid developer circulation pump (not shown), the liquid developer T charged to a positive polarity is supplied from the manifold 4 to the developing roller 1, and the rollers in all the wet image forming apparatuses 100 of the printing apparatus rotate. When driven, a voltage of, for example, +400 V is applied to the developing roller 1, the brush roller 3, the reservoir 5, and the liquid developer scattering prevention plate 6.

Thereafter, the wet image forming apparatus 100 is raised from the position at the end of the printing operation to the position at the time of printing by, for example, rotation of a cam as moving means (not shown) for vertically moving the wet image forming apparatus 100. This wet image forming apparatus 1
00 is moved to the printing position, so that the
Are located at a distance of about 150 μm from the photoconductor B.
Further, the squeeze roller 8 is pressed against the photoreceptor B with a force of 30 kgf by a compression coil spring as urging means accommodated in the squeeze support 11, and is driven to rotate.

Then, an exposure process is performed by a laser unit (not shown), and an electrostatic latent image is formed on the photosensitive member B. Note that the exposed portion potential in the exposure process is, for example, +130 V.

On the other hand, the liquid developer T supplied from the manifold 4 is conveyed to the developing nip portion which is a gap between the photosensitive member B and the developing roller 1 by rotating the developing roller 1 in the direction of the arrow b in FIG. The electrostatic latent image on the photoconductor B located in the gap is formed by an electric field between the photoconductor B serving as an exposure unit and the developing roller 1, that is, +130 V which is an exposure portion potential of the photoconductor B and +400 V which is a development voltage. Is developed due to the potential difference between. During this development, the outer peripheral surface of the developing roller 1 is reversed by an electric field between the unexposed portion of the photoconductor B and the developing roller 1, that is, a potential difference between + 750V which is the charging potential of the photoconductor B and + 400V which is the developing voltage. A development phenomenon occurs, and toner particles T 'adhere.

The toner particles T 'adhering to the outer peripheral surface of the developing roller 1 are attached to the developing roller 2 at a leading edge, which is a leading edge portion.
Removed by Further, the toner particles T 'attached to the developing blade 2 are removed from the developing blade 2 by the brush roller 3 rotating in the direction of the arrow f in FIG. 2 while constantly contacting the developing roller 1 and the developing blade 2. Further, the toner particles T ′ removed by the brush roller 3 are re-dispersed in the liquid developer T stored in the reservoir 5.

Here, the liquid developer T in the reservoir 5 at the beginning of printing does not accumulate until the portion where the brush roller 3 and the developing roller 1 come into contact is immersed, as shown in FIG. For this reason, a part of the liquid developer T adhered to a roller portion (not shown) which is a brush portion of the brush roller 3 is removed from the brush between the reservoir 5 and the developing roller 1 by the elastic force of the roller portion, that is, the restoring force due to the elasticity. The roller 3 splatters in the direction of the arrow f in FIG. 2 which is the rotation direction of the roller 3, and hits the liquid developer splattering prevention plate 6 located in the splattering direction. After a predetermined time has elapsed from the start of this printing, the reservoir 5
When the liquid developer T accumulates in a portion where the brush roller 3 and the developing roller 1 are in contact with each other, the accumulated liquid developer T becomes a resistance, so that the liquid developer T does not scatter due to the elastic force of the roller portion.

As shown in FIG. 6, when the liquid developer T stored in the reservoir 5 becomes full, the liquid developer T overflows, and the overflowed liquid developer T again flows down to a developer tank (not shown) due to gravity.

Further, since an excess liquid developer T adheres to the image formed on the photosensitive member B immediately after the development, the excess liquid developer T is applied to the compression coil accommodated in the squeeze support 11. For example, 30 kgf is applied to the photosensitive member B by a spring.
Is squeezed out by the squeeze roller 8 pressed by the force of. Then, the image on the photoconductor B from which the surplus liquid developer T has been squeezed out has a film shape. Part of the excess liquid developer T squeezed by the squeeze roller 8 is located upstream of the contact portion between the photoconductor B and the squeeze roller 8 and in the gap between the photoconductor B and the squeeze roller 8. Accumulate. Further, another surplus liquid developer T flows down from the squeeze roller 8 to a developer tank (not shown) due to gravity.

After that, since the image formed on the photosensitive member B in the form of a film needs to be dried, the image proceeds to a drying unit (not shown), and the dried image on the photosensitive member B further proceeds to a transfer unit to receive the image. It is transferred to a transcript, for example, paper.

On the other hand, the liquid developer T that has flowed down and returned to the developer tank is supplied again from the manifold 4 to the developing roller 1 by a liquid developer circulation pump (not shown) and circulated.

When printing is completed, the liquid developer circulating pump is stopped to stop the supply of the liquid developer T and the cam is rotated, and the wet image forming apparatus 100 is moved by the squeeze roller 8 from the position at the time of printing. The photosensitive member B is lowered to a position for cleaning. When the wet image forming apparatus 100 is lowered to a position where the photoreceptor B is cleaned by the squeeze roller 8, the compression coil spring accommodated in the squeeze support 11 extends more than at the time of printing, that is, the restoring force due to elasticity becomes smaller. The squeeze roller 8 is pressed against the photosensitive member B with a force of, for example, 0.9 kgf. In this state, the squeeze roller 8 is driven to rotate in the direction of the arrow c 'in FIG. 3, and the gap between the squeeze roller 8 and the photosensitive member B is upstream from the contact portion between the squeeze roller 8 and the photosensitive member B during printing. The liquid developer T remaining on the photosensitive member B is removed and the surface of the photoconductor B is cleaned. Further, at the time of removing the liquid developer T and cleaning the photoconductor B, the wiper blade 9 is pressed against the outer peripheral surface of the squeeze roller 8, and the liquid developer T is also removed from the outer peripheral surface of the squeeze roller 8.

Further, the cam rotates after the cleaning shown in FIG. 3, and the wet image forming apparatus 100 is lowered from the position where the photosensitive member B is cleaned by the squeeze roller 8 shown in FIG. Then, the squeeze roller 8 separates from the photosensitive member B, the rotation of the squeeze roller 8, the development roller 1 and the brush roller 3 stops, the wiper blade 9 separates from the outer peripheral surface of the squeeze roller 8, and the printing apparatus stops. At the time of the stop, the liquid developer T is entirely developed by weight from a hole (not shown) formed in the bottom surface of the reservoir 5 in order to prevent adverse effects such as solidification of the liquid developer T in the reservoir 5. It flows down into the liquid tank, and the inside of the reservoir 5 becomes empty. Thereafter, all the applied voltages are turned off, and the photosensitive member B stops.

As described above, the squeeze roller 8 is located between the contact portion between the developing roller 1 and the brush roller 3 on the rotation direction side of the brush roller 3, that is, between the contact portion between the developing roller 1 and the brush roller 3 and the squeeze roller 8. Since the liquid developer scattering prevention plate 6 is provided, for example, in the initial stage of printing which is the initial stage of the image forming operation, the brush roller 3
When the liquid developer T adhered to the developing blade 2 removed from the developing roller 1 is removed, the liquid developer T is not sufficiently stored in the reservoir 5, so that the contact portion between the developing roller 1 and the brush roller 3 Even if the liquid developer T is not immersed in the liquid developer T stored in the liquid developer T and scattered by the elastic force of the brush roller 3, the liquid developer T hits the liquid developer scatter prevention plate 6 and the surrounding member, for example, the photosensitive member B And the squeeze roller 8 can be prevented from being soiled, and the developed latent image can be prevented from becoming dirty and becoming a dirty transfer.

Further, since the liquid developer scattering prevention plate 6 is formed in a plate shape, it can be formed in a narrow place, and the apparatus can be downsized.

Further, since the liquid developer scattering prevention plate 6 is formed of a plate-like metal member, it is easy to manufacture, for example, it is easy to bend so as to be separated from the developing roller and the liquid developer storage portion by 1.5 mm or more. Thus, it is possible to improve the manufacturability and easily obtain a configuration capable of applying a voltage at substantially the same voltage value as the developing voltage.

Then, the liquid developer scattering prevention plate 6 is
Since the upper end is located above the horizontal line passing through the center of the developing roller 1 and the lower end is located below the horizontal line passing through the opening edge of the upper surface, which is the upper end of the reservoir 5, the liquid developer T that scatters reliably is disposed. It can be captured and contamination due to splashing can be reliably prevented.

Further, the liquid developer scattering prevention plate 6 is
Since the liquid developer T is disposed at a position, for example, 1.5 mm or more away from the developer roller 1 and the reservoir 5, the liquid developer T adhered to the surface of the splattering liquid developer scatter prevention plate 6 adheres to the outer surfaces of the developer roller 1 and the reservoir 5. Can be prevented, and it can be reliably prevented from flowing down and contaminating other parts.

In the above embodiment, the description has been given of the wet image forming apparatus of the printing apparatus. However, as the printing apparatus, any apparatus such as a copying machine, a facsimile, and a printer can be applied.

Although the plate 6 for preventing the liquid level developer from scattering is described as a plate-like metal member, it may be formed of a plastic such as a polyacetal resin.
As described above, by being formed of plastic, it is easy to manufacture, for example, it can be easily formed even in a shape that is bent so as to be separated from the developing roller and the liquid developer reservoir by 1.5 mm or more, thereby improving the manufacturability.

The photosensitive member B is not limited to the belt shape, but may be a substantially cylindrical one.

The cleaning mechanism may be any mechanism generally used in a printing apparatus.

[0041]

According to the present invention, since the liquid developer scattering prevention member is disposed on the rotation direction side of the rotating member from the contact portion between the developing roller and the rotating member, for example, in the initial stage of the image forming operation. At the beginning of a certain printing, since the liquid developer is not sufficiently stored in the liquid developer storage section, the contact portion between the developing roller and the rotating body is not immersed in the liquid developer stored in the liquid developer. Even if the liquid developer scatters due to the elastic force of the rotating body, it can prevent the liquid developer from scattering and hitting the surrounding members such as the photosensitive member.

Also, since the roller is disposed between the contact portion of the developing roller and the rotating member and the excess developer removing roller, for example, in the initial stage of printing, which is the initial stage of the image forming operation, the liquid developer is sufficiently stored in the liquid developer reservoir. The liquid developer does not accumulate in the liquid developer, so that the contact portion between the developing roller and the rotating body is not immersed in the liquid developer stored in the liquid developer, and the liquid developer is scattered by the elastic force of the rotating body. Even so, it is possible to prevent the peripheral members such as the photoconductor and the excess developer removing roller from being stained by hitting the liquid developer scattering prevention plate.

Since the liquid developer scattering prevention member is formed in a plate shape, it can be provided even in a narrow place, and the apparatus can be downsized.

Further, since the liquid developer scattering prevention plate is formed of a plate-shaped metal member, it is easy to manufacture. For example, even if the plate is bent so as to be separated from the developing roller and the liquid developer storage portion by 1.5 mm or more, it can be easily formed. It is possible to easily obtain a configuration which can be formed, can improve the manufacturability, and can be applied at substantially the same voltage value as the developing voltage.

Further, the liquid developer scattering preventing member is disposed such that its upper end is located above a horizontal line passing through the center of the developing roller, and its lower end is located below a horizontal line passing through the opening edge of the upper surface which is the upper end of the liquid developer storage section. Since the liquid developer is disposed so as to be positioned, the scattered liquid developer can be reliably captured, and contamination due to the scatter can be reliably prevented.

Further, since the liquid developer splatter is disposed at a position, for example, 1.5 mm or more away from the developing roller and the liquid developer reservoir, the liquid developer attached to the surface of the splattered liquid developer splatter is provided. Can prevent the developer from adhering to the outer surface of the developing roller and the liquid developer storage section,
It is possible to reliably prevent the water from flowing down and contaminating other parts.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a wet image forming apparatus according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing an operation during printing of the wet image forming apparatus shown in FIG.

FIG. 3 is a sectional view showing an operation during cleaning of the wet image forming apparatus shown in FIG. 1;

FIG. 4 is a cross-sectional view showing a stopped state of the wet image forming apparatus shown in FIG.

5 is a sectional view of the vicinity of a brush roller showing a state of a liquid developer in an initial stage of a printing operation of the wet image forming apparatus shown in FIG. 1;

6 is a cross-sectional view of the vicinity of a brush roller showing a state of a liquid developer during printing of the wet image forming apparatus shown in FIG.

DESCRIPTION OF SYMBOLS 1 Development roller 2 Development blade 3 Brush roller 4 Manifold 5 Reservoir 6 Liquid developer scattering prevention plate 7 Shield 8 Squeeze roller 9 Wiper blade 10 Blade holder 11 Squeeze support 12 Development support 100 Wet image forming apparatus B photosensitive Body T Liquid developer

Claims (5)

(57) [Claims] 1. A developing roller for developing by supplying the liquid developer to the photosensitive body that moves by driving the rotation, <br/> liquid distal edge to the outer peripheral surface of the developing roller is attached to the developing roller in contact A blade that removes developer and contacts the blade
A brush roller having an elastic member on an outer peripheral surface for removing the liquid developer attached to the blade;
A liquid developer storage unit that houses a roller and stores at least the upper surface for storing the liquid developer, and is located on the moving direction side of the photoconductor with respect to the development roller and is in contact with the photoconductor.
Excess liquid adhering to the photoreceptor by following rotation
Wet roller with an excess developer removing roller for removing the body developer
In the image forming apparatus, a contact portion between the developing roller and the brush roller is
The upper end is located above a horizontal line passing through the center of the developing roller, and the lower end is located below a horizontal line passing through the opening edge of the liquid developer storing portion. Be located
Image forming apparatus, comprising: a liquid developer scattering prevention member . 2. The wet image forming apparatus according to claim 1, wherein the liquid developer scattering prevention member is formed in a substantially plate shape by a plate-shaped metal member. 3. The wet image forming apparatus according to claim 1, wherein said liquid developer scattering prevention member is formed of a polyacetal resin in a substantially plate shape. 4. The wet image forming apparatus according to claim 1, wherein the liquid developer scattering prevention plate is provided at a distance of at least 1.5 mm from the developing roller and the liquid developer storage section. 5. A printing apparatus comprising: a moving photosensitive member; and the wet image forming apparatus according to claim 1.