JPH06149073A - Wet type developing device - Google Patents

Abstract

PURPOSE:To uniformly supply a developing liquid to a liquid storage part, to suppress mist generated at the time of supplying the developing liquid to the liquid storage part as little as possible and to prevent the mist from being scattered outside a device and stuck to other devices in an image forming device, even if the mist is generated. CONSTITUTION:A guiding plate 21 receiving the developer liquid on the upper surface and makes the developer liquid to flow down in the liquid storage part 13 is disposed on the lower side of a nozzle 15. A mist cover 22 is provided between the top end part 211 of the guiding plate 21 and the upper part of the casing of a developing device 4. Then, the guiding plate 21 is disposed so that the angle theta1 of a developing liquid flowing down surface side formed by a bottom end part 212 and a scraper 7 is an acute angle, the angle theta2 of a developing liquid flowing down surface side formed by the bottom end part 212 and the developing liquid surface 130 of the liquid storage part 13 is an obtuse angle and moreover, the bottom end part 212 encroaches into the developing liquid surface 130 of the liquid storage part 13 by L1, to form a gap L2 between the bottom surface part 212 and the scraper 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus such as a copying machine, a facsimile and a printer, and more particularly to a wet developing apparatus using a liquid developer.

[0002]

2. Description of the Related Art Conventionally, there is known an image forming apparatus in which charging, exposing, developing, transferring, cleaning and discharging devices are arranged around a photosensitive drum as a latent image carrier. As this type of image forming apparatus, there is also known one in which a wet developing apparatus using a liquid developer (hereinafter referred to as a developer) is applied as a developer. In the image forming apparatus to which the above-mentioned wet developing device is applied, as shown in FIG. 7, for example, the surface of the photosensitive drum 1 is charged by the charging device 2 arranged in the vicinity of the photosensitive drum 1, and the laser from the exposure device is used. Light 3
The original image is exposed by, and the area outside the image forming area is neutralized by an eraser (not shown), and the developing solution is supplied to the original image by the developing device 4'and development is performed.

Here, in the developing device 4 ', the developing roller 5 as a developer bearing member is rotated in the direction of rotation with respect to the photosensitive drum 1 with a minute gap from the surface of the photosensitive drum 1. It is pivotally supported. Further, below the developing roller 5, there is provided a reverse roller 6 for removing the excess developing liquid adhering to the surface of the photosensitive drum 1 after development, in a direction opposite to the photosensitive drum 1 at a portion facing the photosensitive drum 1. It is rotatably supported by. Then, one end of each of the developing roller 5 and the reverse roller 6 is brought into pressure contact with the surface of the developing roller 5 and the reverse roller 6 to remove the developer remaining on the surface of the developing roller 5 and the reverse roller 6, and the cleaning blade 8 is formed. It is provided. Scraper 7
The cleaning blade 8 and the cleaning blade 8 are fixed to the holding bracket 9 directly or indirectly fixed to the casing of the developing device 4 by screws 10 and a pressing plate 11 at the other ends. Then, the developing roller 5 and the scraper 7 form a liquid storage portion 13 for temporarily storing the developing liquid used for development in the developing portion 12 formed by the developing roller 5 and the photosensitive drum 1. ing. Further, above the developing device 4 ', a developing solution supply means 14' for supplying the developing solution from a developing solution tank (not shown) to the solution reservoir 13 from the nozzle 15 'is provided. Further, a cover 16 forming an upper wall of the developing device 4'is attached to the upper part of the developing solution supply means 14 '. An opening 17 communicating with the developer tank is formed in the lower part of the developing device 4 '.

In the developing device 4 ', the developing solution supplied to the solution reservoir 13 from the nozzle 15' by the developing solution supply means 14 'and temporarily stored therein adheres to the surface of the developing roller 5 and the developing roller 5'. Is conveyed to the developing section 12 by the rotation of the. Then, the developer not used for development in the developing unit 12 and attached to the surface of the developing roller 5 is scraped off by the scraper 7 as the developing roller 5 rotates. In addition, of the developer that has adhered to the surface of the photosensitive drum 1 in the developing section 12, the excess developer is scraped off by the reverse roller 6. Further, the developer adhered to the surface of the reverse roller 6 is
As the reverse roller 6 rotates, the cleaning blade 8
Removed by. Then, the developing solution removed from the surface of the developing roller 5 or the reverse roller 6 reaches the lower part of the developing device 4, passes through the opening 17, and is collected in the developing solution tank.

In the wet type developing device such as the developing device 4 ', the developing solution can be guided to an arbitrary place by using a pump or the like, and the pump and the like and the developing solution supply portion can be set at a separate place. Is an advantage. However, in the developing device 4 ', since the developer supplied from the developer tank is dropped onto the scraper 7 from the nozzle 15' located above the liquid reservoir 13, the developer is scraped by the scraper 7 or the reservoir. Bubbles 18 and mist 19 may be generated when colliding with the developer pool of the portion 13.
If 9 is scattered from the upper opening 20 of the developing device 4 ′, there is a problem in that it adheres to the mirrors and lenses of the exposure device and leads to deterioration of the image.

Therefore, in order to solve the above-mentioned problems, a liquid reservoir is formed by a developing roller and a scraper brought into pressure contact with the developing roller, and an upper cover for covering the developing roller and the scraper is provided to remove the developing solution. A wet developing device is known in the prior art, which is configured to flow as a laminar flow into a developing roller along a scraper and an upper cover (see, for example, Japanese Utility Model Laid-Open No. 63-137372).

[0007]

However, as disclosed in the above publication, even if the developing solution is poured into the developing roller as a laminar flow, the mist is completely generated when the developing solution flows down to the liquid reservoir. It is difficult to prevent. Further, in the configuration disclosed in the above publication, since the liquid reservoir portion in which mist is generated and the outside of the developing device communicate with each other, the mist may scatter to the outside of the developing device through this space,
There is a problem in that it cannot be prevented from adhering to the mirror or lens of the exposure apparatus. Here, in order to prevent the mist generated when the developing solution flows down to the liquid reservoir, it is possible to set the amount of the developing solution supplied from the nozzle 15 ′ to an amount that completely fills the space. However, in this case, since the developing solution contacts the surface of the photoconductor drum while maintaining the flow velocity at the time of supply, there is a problem that density unevenness and image deletion easily occur.

By the way, in the developing device 4'shown in FIG. 7, since the side walls are not provided at both ends of the liquid reservoir 13 in the axial direction of the developing roller 5, the developing solution flows out therefrom. Therefore, the amount of the developer supplied from the nozzle 15 ′ to the liquid reservoir 13 is smaller than that immediately below the nozzle 15 ′ (near the central portion in the axial direction of the developing roller 5 in FIG. 8) as shown in FIG. The developing roller is less at both ends in the 5-axis direction. As a result, even in the developing unit 12, there is a problem that the number of the end portions in the axial direction of the developing roller 5 becomes smaller than that in the vicinity of the central portion in the axial direction of the developing roller 5. This phenomenon is particularly remarkable when the supply of the developing solution to the solution reservoir 13 is started.

With respect to this problem, FIG. 4 of the above publication shows a structure in which a plurality of nozzles are provided at both ends in the axial direction of the developing roller, and the developing solution is supplied to the liquid reservoir from these nozzles. . In this structure, the plurality of nozzles, the portion of the scraper surface that guides the developer, and the liquid reservoir function to distribute the developer to both ends in the axial direction of the developing roller. That is, the developing solution dispersedly supplied from the plurality of nozzles flows down while spreading on the scraper surface toward both ends in the axial direction of the developing roller, and further spreads in the liquid reservoir formed by the developing roller and the scraper. However, this structure also has a problem that it is difficult to make the amount of the developer uniform in the liquid reservoir because the developer flows out from both ends of the liquid reservoir in the axial direction of the developing roller. . . In addition, since it is necessary to provide a plurality of nozzles, the size of the apparatus itself becomes large and the cost is high.

The present invention has been made in view of the above problems, and an object of the present invention is to uniformly supply a developing solution to a liquid reservoir and to supply the developing solution to the liquid reservoir. (EN) A wet developing device capable of suppressing a generated mist as much as possible, and even if the mist is generated, the mist is scattered to the outside of the apparatus and does not adhere to other apparatuses in the image forming apparatus, and a good image can be obtained. It is to be.

[0011]

In order to achieve the above-mentioned object, the invention of claim 1 is directed to a developer carrying member which is arranged to face the surface of a latent image carrying member, and a developing process for the developer carrying member. A developing solution supply means for supplying a liquid, and the developing solution carrier supplies the developing solution supplied from the developing solution supply means to the latent image formed on the surface of the latent image carrier, In a wet type developing device for developing the latent image, a liquid reservoir portion forming means for contacting the developer carrier and forming a liquid reservoir portion together with the developer carrier, and a developer from the developer supply means, A guide member for guiding the developer carrier from the downstream side in the developer conveying direction to the liquid reservoir is provided. According to a second aspect of the present invention, fence members for restricting the outflow of the developer are provided on both ends of the guide member in the axial direction of the developer carrier, and the developer guide width formed by the fence member is set to the above. It is characterized in that the width is set to be less than the width of the developer carrying member in the axial direction and more than the effective image width. According to a third aspect of the present invention, at least one of a gap formed by the guide member and the developer carrying member and a gap formed by the guide member and the liquid reservoir forming means is provided on the developer carrying member. It is characterized in that both ends are larger than the central part in the body axis direction.

[0012]

According to the first aspect of the invention, the developing solution from the developing solution supply means flows down while spreading on the guide member surface toward both ends in the axial direction of the developer carrying member, and is supplied to the solution reservoir. Here, when the developer is not accumulated in the liquid reservoir, the developer is supplied from the guide member surface to the liquid reservoir forming means surface,
Even on the surface of the liquid reservoir forming means, the developer flows downward while spreading toward both ends in the axial direction of the developer carrier. Further, since the guide member is arranged so as to guide the developer to the liquid reservoir from the downstream side in the developer carrying direction by the developer carrying member, the developing liquid flow-down portion of the liquid reservoir is guided by the developing device. It is cut off from the outside. In the invention of claim 2, the fence member restricts the outflow of the developer from both ends of the liquid reservoir in the axial direction of the developer carrier, so that the amount of the developer in the liquid reservoir is
There is no significant difference between the two ends of the liquid reservoir in the axial direction of the developer carrier and the central part. Further, since the developer guide width formed by the fence member is set to be less than or equal to the width in the axial direction of the developer carrier, and within the effective image width or more, the effective image width is substantially uniform. The liquid volume can be adjusted. In the invention of claim 3, the gap formed by the guide member and the liquid reservoir forming means is configured such that both ends thereof are larger than the central portion in the axial direction of the developer carrier, whereby the developer carrier. The flowable amount of the developer in the direction is larger at both end portions than in the central portion in the axial direction of the developer carrier. Further, the gap formed by the guide member and the developer carrying member is configured such that both ends thereof are larger than the central portion in the axial direction of the developer carrying member, so that the amount of the developer solution in the liquid reservoir can be carried. Even when both end portions are smaller than the central portion in the body axis direction, the developer carrier is conveyed from the liquid reservoir by the developer carrier at the central portion in the developer carrier axial direction where the gap between the guide member and the developer carrier is relatively small. A part of the developing solution is regulated by the guide member and is dispersed to both ends. For this reason,
There is no significant difference in the amount of the developer carried to the surface of the latent image carrier by the developer carrier between the both ends and the central part in the axial direction of the developer carrier.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to an electrophotographic copying machine (hereinafter referred to as a copying machine) which is an image forming apparatus will be described below. FIG. 1 is a schematic configuration diagram of a wet developing apparatus according to this embodiment. FIG. 2 is a partial cross-sectional perspective view of the wet developing device. Here, the developing device 4 shown in FIG.
The difference from the developing device 4'shown in FIG. 4 is the structure for supplying the developing solution to the liquid reservoir 13 formed by the developing roller 5 and the scraper 7. Since the other structure is the same as that of the developing device in FIG. 5, the same reference numerals as those in FIG.

In the developing device 4, the developer supply means 1
No. 4 nozzle 15 is located above the developing roller 5.
A guide plate 21 is provided below the nozzle 15 as a guide member that receives the developer flowing out from the nozzle 15 on its upper surface and causes it to flow down to the liquid reservoir 13. The guide plate 21 has an upper end portion 211 more than the lower end portion 212 in the developer transport direction so that the developer flows from the downstream side in the developer transport direction by the developing roller 5 to the liquid reservoir 13 on the upstream side in the developer transport direction. It is arranged to be inclined so as to be located on the downstream side.

A mist cover 22 is provided between the upper end portion 211 of the guide plate 21 and the upper portion of the casing of the developing device 4.

Here, in order to effectively prevent the generation of bubbles or mist in the liquid reservoir 13, the developer is stored in the liquid reservoir 13.
It is desirable to be guided below the developer surface.
Therefore, in the present embodiment, as shown in FIG. 2, in the guide plate 21, the angle θ1 on the lower surface side of the developing solution formed by the lower end portion 212 and the scraper 7 becomes an acute angle, and the lower end portion 212 is formed.
And the developer surface 130 of the liquid reservoir 13 forms an obtuse angle .theta.2 on the lower surface side of the developer, and the lower end 212 enters the developer surface 130 of the liquid reservoir 13 by L1 to form a lower end. It is arranged so as to form a gap of L2 between the portion 212 and the scraper 7. Further, the guide plate 21 is curved so as to cover the peripheral surface of the developing roller 5, and is arranged so as to form a gap L3 between the guide plate 21 and the peripheral surface of the developing roller 5.

In the above structure, when the developer is started to be supplied to the liquid reservoir 13 having no developer, the developer discharged from the nozzle 15 is received at a place apart from the liquid reservoir 13 on the upper surface of the guide plate 21. And the guide plate 2 as shown in FIG.
1 The upper surface spreads down toward both ends of the developing roller 5 in the axial direction, flows down at an angle of θ1 with respect to the scraper 7, and the upper surface of the scraper 7 spreads down toward both ends of the developing roller 5 in the axial direction. It is stored in the liquid reservoir 13. Then, after the amount of the developer stored in the liquid reservoir 13 is stabilized, when the developer is continuously supplied to the liquid reservoir 13, the developer is discharged from the nozzle 15 and the upper surface of the guide plate 21 is developed as shown in FIG. The developer that has flowed down while spreading toward both ends in the axial direction of the roller 5 is θ with respect to the developer surface 130.
It flows down at an angle of 2.

In FIG. 3, reference numeral 5a is a spacer roller for forming a gap (developing gap) between the developing roller 5 and the photosensitive drum 1 which will be described later. The spacer roller 5a is a roller having a diameter slightly larger than the diameter of the developing roller 5, is provided at both axial ends of the developing roller 5, and is in contact with the surface of the photosensitive drum 1. Further, reference numeral 6a is a spacer roller for forming a gap between the reverse roller 6 and the photosensitive drum 1 which will be described later. The spacer rollers 6a are rollers having a diameter slightly larger than the diameter of the reverse roller 6, are provided at both axial ends of the reverse roller 6, and are in contact with the surface of the photosensitive drum 1.

As described above, according to this embodiment, the developing solution is supplied at an acute angle to the scraper 7 when the supply is started, and thereafter (when the developing solution surface is stable), the lower end portion 212 has the liquid storage portion 13. Since the guide plate 21 is inserted by L1 with respect to the developer surface 130, it is supplied at an obtuse angle with respect to the developer surface 130, so that generation of bubbles and mist can be prevented as much as possible. Also in this embodiment, the developer surface 13
Mist is liable to be generated until 0 becomes stable, especially when the supply of the developing solution is started.
1 and the mist cover 22 block the mist generating portion from the outside of the developing device 4, and the mist scatters to the outside of the developing device 4 and adheres to other devices in the copying machine, for example, a mirror and a lens of the exposure device. There is nothing to do.

In this embodiment, the guide plate 21
The smaller the gap L2 formed between the lower end portion 212 and the scraper 7, the less the generation of bubbles and mist at the start of supply. However, if the gap L2 is made extremely small, the gap L2 serves as the developer flow passage, so that the amount of the developer conveyed in the direction of the developing roller 5 becomes small, so that the developing unit 12 has a sufficient amount. The developer cannot be transported. Therefore, the gap L2
Must be set in consideration of the amount of bubbles or mist generated and the amount of developer to be conveyed. According to the experiment by the present inventor, the result that the gap L2 is preferably 2 mm or more is obtained.

By the way, in the structure shown in FIGS. 1 to 3, the developing solution flows out from both ends of the liquid reservoir 13 in the axial direction of the developing roller 5, and the developing solution of both ends of the liquid reservoir 13 in the axial direction of the developing roller 5 is developed. The liquid volume becomes smaller than that in the central part. The same applies to the developing unit 12. Furthermore,
In the developing unit 12, the developing roller 5 and the photosensitive drum 1
A gap (development gap) is formed between and, and since the developer flows down through this gap, the amount of the developer at both end portions is significantly smaller than that in the central portion. Here, the difference in the amount of the developing solution between the central portion and both end portions of the liquid reservoir 13 and the developing portion 12 is moderated by the guide plate 21 to some extent, but this may not be sufficient depending on the device.

Therefore, an embodiment for making the amount of the developing solution more uniform in the central portion and both end portions of the liquid reservoir 13 and the developing portion 12 will be described. In FIG. 4, the tip end of the lower end portion 212 is such that the gap L2 (see FIG. 2) between the lower end portion 212 of the guide plate 21a and the scraper 7 increases from the central portion in the axial direction of the developing roller 5 toward both end portions. The part is notched. Further, FIG. 5 is a view showing the arrangement state of each of the photosensitive drum 1, the developing roller 5, and the guide plate 21a as seen from the direction of the arrow in FIG. 4, and the arrangement state of the reverse roller 6 is also shown for convenience of explanation. . In FIG. 5, a gap between the photosensitive drum 1 and the developing roller 5 (developing gap)
L4 is a diameter difference L between the developing roller 5 and the spacer roller 5a.
5 and the difference (corresponding to the thickness of the cured layer) L6 between the surface of the photosensitive drum 1 that is in contact with the spacer roller 5a on the surface of the photosensitive drum 1 and the surface of the photosensitive drum 1, which is, for example, 150 μm.
It is set around m. The gap between the photoconductor drum 1 and the reverse roller 6 is also the same as the difference in diameter between the reverse roller 6 and the spacer roller 6a, and the surface of the surface of the photoconductor drum 1 which is in contact with the spacer roller 6a and which is exposed to light. It is the sum of the difference from the surface of the body drum 1 (corresponding to the thickness of the cured layer), and is set to, for example, about 50 μm. Further, the lower end portion 212 of the guide plate 21a has the smallest gap with respect to the peripheral surface of the developing roller 5 at the central portion in the axial direction of the developing roller 5 (L
7), it is formed so that it becomes larger toward both ends (in the figure, the difference in the gap between the center and both ends is indicated by L8). The effective image width in this embodiment, that is, the width capable of effectively forming an image on the surface of the photosensitive drum 1 is a width obtained by removing a predetermined width (L9) from both axial end portions of the developing roller 5, and the width of the guide plate 21a. The width is set to be shorter than the width in the axial direction of the developing roller 5 (L10) at both ends and longer than the effective image width. The width of the reverse roller 6 is longer than the width in the axial direction of the developing roller 5 at both ends (L11), and the width of the spacer roller 5a is large.
It is set to be shorter than the width to the inner side surface of (L12). The width of the guide plate 21a may be set to the same width as that of the developing roller 5 by setting L10 to 0, or may be set to be longer than the width of the developing roller 5.

With this structure, a gap L2 between the lower end 212 of the guide plate 21a and the scraper 7 is formed.
However, since the lower end portion 212 is formed so as to become larger from the central portion in the axial direction of the developing roller 5 toward both ends, the amount of the developer supplied to the liquid reservoir 13 that can flow around in the developing roller 5 direction. (Distributable amount) is larger in both end portions than in the central portion in the axial direction of the developing roller 5. For this reason,
Even when the amount of the developer transported from the liquid reservoir 13 by the developing roller 5 is smaller at both ends as compared with the central portion in the axial direction of the developing roller 5, the gap between the guide plate 21a and the developing roller 5 is relatively small. At the central portion in the axial direction, a part of the developer carried by the developing roller 5 from the liquid reservoir 13 is regulated by the guide plates 21a and dispersed to both end sides. As a result, there is no significant difference in the amount of developing solution conveyed to the surface of the photosensitive drum 1 by the developing roller 5 between the both ends and the central part in the axial direction of the developing roller 5.

As described above, according to this embodiment, it is possible to prevent an extreme difference in the amount of developing solution between the central portion and both end portions of the liquid reservoir 13 and the developing portion 12.

Another method for preventing an extreme difference in the amount of developing solution between the central portion and both ends of the liquid reservoir 13 and the developing portion 12 is the following method.
That is, in FIG. 6A, side fences 40 as fence members are provided at both ends of the guide plate 21b in the developing roller 5 axial direction. In this embodiment, the side fence 40 does not necessarily need to be in close contact with the scraper 7, and is provided so that a minute gap is formed between the side fence 40 and the scraper 7. The side fences 40 on both sides are provided on the guide plate 21b so as to be inside the end position of the developing roller 5 and outside the effective image width.

With this structure, the nozzle 1
The developer supplied from No. 5 and flowing down on the guide plate 21b while spreading toward both ends in the axial direction of the developing roller 5 is less likely to flow out at both ends in the axial direction of the developing roller 5 in the liquid reservoir 13, and thus the liquid reservoir There is no extreme difference in the amount of developer in the part 13.

As shown in FIG. 6B, if the side fences 42 at both ends are fixed by the connecting member 41, the gap between the scraper 7 and the scraper 7 is separated from the liquid reservoir 13. Therefore, it is possible to effectively prevent an extreme difference in the amount of the developer in the liquid reservoir 13 from occurring due to the outflow of the developer.

[0028]

According to the first aspect of the invention, the developing solution from the developing solution supply means is applied to the surface of the guide member and the surface of the solution reservoir forming means when the developer is not accumulated in the solution reservoir. Since it flows down while spreading toward both ends in the axial direction of the carrier, there is an effect that the developer can be uniformly supplied to the liquid reservoir. Further, the guide member is arranged so as to guide the developing solution to the liquid reservoir from the downstream side in the developing solution conveying direction by the developer carrier, and the developing solution flow-down portion of the liquid reservoir is guided by the developing device. Since it is shielded from the outside, it suppresses the mist generated when the developer is supplied to the liquid reservoir, and even if the mist occurs, the mist scatters out of the device and adheres to other devices in the image forming apparatus. There is an effect that a good image can be obtained without any trouble. According to the second aspect of the present invention, the fence member restricts the outflow of the developer from both ends of the liquid reservoir in the axial direction of the developer carrier, so that the amount of the developer in the liquid reservoir is the same as that of the developer in the liquid reservoir. There is no significant difference between the both ends and the central part in the axial direction of the agent carrier, and it is possible to reliably obtain a substantially uniform amount up to the effective image width, so that it is possible to obtain a good image without density unevenness. is there. According to the invention of claim 3, the flowable amount of the developer in the liquid reservoir toward the developer carrying member is larger at both end portions than in the central portion in the developer carrying member axial direction, and
Even when the amount of the developer in the liquid reservoir is smaller at both ends than in the central portion in the axial direction of the developer carrier, in the central portion in the axial direction of the developer carrier in which the gap between the guide member and the developer carrier is relatively small, Since a part of the developer transported from the liquid reservoir by the developer carrier is regulated by the guide member and dispersed to both end sides, the developer carrier is carried at both axial end portions and the central portion. The effect is that there is no significant difference in the amount of developing solution conveyed to the surface of the latent image carrier by the body.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a wet developing device according to an embodiment.

FIG. 2 is an explanatory view showing a disposition state of guide plates.

FIG. 3 is a partial cross-sectional perspective view of the wet developing apparatus.

FIG. 4 is a schematic configuration diagram of a guide plate according to another embodiment.

FIG. 5 is an explanatory view showing a disposition state of each of the photosensitive drum, the developing roller, and the guide plate as viewed from the direction of the arrow in FIG.

FIG. 6A is a schematic configuration diagram of a guide plate according to another embodiment provided with a side fence. (B) is explanatory drawing which shows the other structural example of a side fence.

FIG. 7 is a schematic configuration diagram of a conventional wet developing device.

FIG. 8 is an explanatory diagram of a problem in a conventional wet developing device.

[Explanation of symbols]

 1 Photosensitive Drum 4 Developing Device 5 Developing Roller 6 Reverse Roller 7 Scraper 8 Cleaning Blade 12 Developing Section 13 Liquid Reservoir 14 Developer Supplying Means 15 Nozzle 18 Bubble 19 Mist 21 Guide Plate 22 Mist Cover 40 Side Fence 130 Developer Surface 211 Upper end of guide plate 212 Lower end of guide plate

Claims (3)

[Claims] 1. A developer carrying member disposed opposite to a surface of a latent image carrying member, and a developer supplying means for supplying a developing solution to the developer carrying member. In a wet type developing device for supplying the developing solution supplied from the developing solution supply means to the latent image formed on the surface of the latent image carrier to develop the latent image, the developer carrier is brought into contact with the latent image carrier. A liquid reservoir forming means for forming a liquid reservoir together with the developer carrying member,
A wet developing device comprising: a guide member for guiding the developing solution from the developing solution supply means to the solution reservoir from the downstream side in the developing solution conveying direction by the developer carrying member. 2. A fence member for restricting the outflow of the developer is provided at both ends of the guide member in the axial direction of the developer carrier, and a developer guide width formed by the fence member is set to the developer. The wet developing device according to claim 1, wherein the width is set to be equal to or less than the width of the carrier in the axial direction and equal to or more than the effective image width. 3. At least one of a gap formed by the guide member and the developer carrier and a gap formed by the guide member and the liquid reservoir forming means is provided on the developer carrier shaft. The wet developing device according to claim 1, wherein both end portions are larger than a central portion in the direction.