JPH08146774A - Excess developer removing device - Google Patents

Abstract

PURPOSE: To remove excess developer blown off to be gathered at a terminal part on a side in the moving direction of a photosensitive material with air from a nozzle. CONSTITUTION: The photosensitive material 2 on which a latent image is recorded is wound round a rotating drum 6 and integrally moved with the drum 6. In the case of developing the recorded latent image to a visible image with the developer supplied from a developing electrode 31a in a developing device 31 made proximate to the drum 6, the excess developer adhering to the material 2 is removed with air blowing out from the nozzle 48a of a wind pressure device 48 provided on a downstream side in the moving direction of the material 2 from the developing device 3 in this device. After finishing the development of the material 2, the excess developer blown off to be gathered at the terminal part with the air from the nozzle 48a is removed by providing an excess developer absorbing member 22 wound in a roll state on an upstream side in the moving direction of the material 2 from the nozzle 48a so that it can be taken up, and bringing a part of the absorbing member 22 into contact with the terminal part on the side in the moving direction of the material 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surplus developing solution removing apparatus for removing surplus developing solution adhering to a photosensitive material by air blown from a nozzle provided downstream of a developing device in the transfer direction of the photosensitive material. The present invention relates to an excess developing solution removing device configured to remove excess developing solution blown to the end portion on the transfer direction side of a photosensitive material by air from a nozzle with a part of an excess developing solution absorbing member wound in a roll shape. .

[0002]

2. Description of the Related Art A wet type electronic device in which an electrostatic latent image is recorded on a photosensitive material wound around a rotating drum and the electrostatic latent image is developed by a wet developing device close to the rotating drum to form a visible image. In a photographic device, it is inevitable that the developing solution (toner) remains on the surface of the photosensitive material (image carrier) after passing through the developing device, and this residual developing solution (hereinafter referred to as excess developing solution) If left unattended, the quality of the finished image will be degraded. Therefore, an example of a wet color electrophotographic copying machine in which an excessive developing solution removing means for removing an excessive developing solution adhering to a photosensitive material is provided downstream of a developing device in a transfer direction of the photosensitive material, and an excessive developing method of another example Liquid removing device
-144180 and JP-A-6-51642.

FIG. 5 is a diagram for explaining a part of an example of the conventional example, FIG. 6 is a diagram for explaining a part of an excessive developing solution removing device of another example of the conventional example, and FIG. 7 is an excessive development. FIG. 9 is a diagram showing a state in which the excess developer is blown to the terminal non-image portion of the photosensitive material by the air from the nozzle in the liquid removing device.

First, the wet color electrophotographic copying machine 100 shown in FIG. 5 is disclosed in Japanese Patent Laid-Open No. 62-144180.
Japanese Patent Laid-Open Publication No. 2003-242242, and here, only the excessive developing solution removing means for removing the excessive developing solution adhering to the photosensitive material will be briefly described.

As shown in FIG. 5, in a conventional wet color electrophotographic copying machine 100, a photosensitive material 101 having an electrostatic latent image recorded thereon is wound around a rotating drum 102 and is integrated with the rotating drum 102 by an arrow A. It is rotatably transferred in the direction. Further, below the rotary drum 102, a plurality of developing devices 103 to 105 for color developing the photosensitive material 101 are provided so as to be movable back and forth with respect to the rotary drum 102. Among the plurality of developing devices 103 to 105, the developing device 103 is a cyan developing device, the developing device 104 is a magenta developing device, and the developing device 105.
Is a yellow developing device, and a black developing device (not shown) is provided as necessary.

Here, for example, in the state where the developing device 103 for one color is brought close to the rotating drum 102, a long developing head 103a along the axis (not shown) of the rotating drum 102 provided in the developing device 103. The developer supplied from the photosensitive material 1
01 makes the recorded electrostatic latent image into a visible image, and similarly, the developing device 1 is rotated every one rotation of the rotating drum 102.
4. By the developing device 105, color development can be sequentially repeated.

Further, the photosensitive material 1 is provided downstream of the developing device 103 near the rotary drum 102 in the transfer direction of the photosensitive material 101.
An excess developing solution removing means for removing the excess developing solution adhering to 01 is provided.

The excess developer removing means is a liquid squeezing roller 106, a liquid recovery blade 107, and an air knife device 1.
And 08. The liquid squeezing roller 106 has a large diameter at both ends, and an intermediate portion corresponding to the image portion of the photosensitive material 101 is formed to have a smaller diameter than the both end portions to remove the excess developer adhering to the non-image portions on both sides of the photosensitive material 101. Have been removed. Also,
The liquid recovery blade 107 includes a developing head (developing electrode) 10
3a is in a developing position in which it is closely supported by the rotating drum 102, its upper end is separated from the photosensitive material 101, and when the developing device 103 is lowered by a predetermined amount, its upper end is raised and the rotating drum 102 is It is in contact with the outer peripheral surface.
Therefore, at the end of development, the excess developer adhering to the photosensitive material 101 is flowed down via the liquid recovery blade 107 by the air pressure of the air knife device 108 and removed.

Next, another example of the excessive developing solution removing device 200 shown in FIG. 6 is disclosed in Japanese Unexamined Patent Publication No. 6-51642, in which the excessive developing solution adhering to the photosensitive material is removed. Only the liquid removing means will be briefly described.

As shown in FIG. 6, a photosensitive material 201 on which an electrostatic latent image is recorded is wound around a rotary drum 202 in the excessive developer removing device 200 of another example, and is integrated with the rotary drum 202 in the direction of arrow A. Has been rotatably transferred to. A developing device 203 for developing the photosensitive material 201 is provided below the rotating drum 202 so as to be movable back and forth (movable up and down) in a direction perpendicular to the rotating drum 202 (directions of arrows B ₁ and B ₂ ). There is.

Here, the developing device 203 is connected to the rotary drum 2
02, the long developing electrode 203 along the shaft 202a of the rotary drum 202 provided in the developing device 203.
The developer supplied from a is brought into contact with the photosensitive material 201 to visualize the recorded electrostatic latent image, and the developer overflowing from the developing electrode 203a is collected into the developer collecting drain 20.
Recovered in 3b. A blower 204 having a nozzle 204a for blowing air to the downstream side of the developing device 203 in the transfer direction of the photosensitive material 201 is provided as an excessive developing solution removing means for removing the excessive developing solution adhering to the photosensitive material 201. In addition, the tip of the nozzle 204a of the blower 204 is brought close to the developing electrode 203a in the developing device 203. Then, during development on the photosensitive material 201, the photosensitive material 2
The excess developer adhering to 01 is blown off by the air blown out from the nozzle 204a, and the developer recovery drain 2
It is collected at 03b.

[0012]

In the wet color electrophotographic copying machine 100 of the above-described example, the photosensitive material 10 is used.
A liquid squeezing roller 106 and a liquid recovery blade 107 are provided as excess developer removing means for removing the excess developer adhering to No. 1.
And the air knife device 108, and the photosensitive material 101
During development, the stepped liquid squeeze roller 106 removes the excess developer adhering to the non-image areas on both sides of the photosensitive material 101, and when the development on the photosensitive material 101 is completed, the photosensitive material 1
Although the excess developing solution adhering to 01 is flowed down and removed by the air pressure of the air knife device 108 via the solution collecting blade 107, the photosensitive material 10 is being developed during development on the photosensitive material 101.
It is relatively neglected to remove the excess developer adhering to No. 1 above. That is, the photosensitive material 101 is the rotating drum 10
In order to remove the excess developer adhering to the image portion of the photosensitive material 101 because it is transferred together with 2 in the direction of arrow A,
This is a problem because the excess developer must be removed by the liquid recovery blade 107 and the air knife device 108 when the rotary drum 102 is rotated next time after the development is completed. Further, since the liquid recovery blade 107 is repeatedly used,
The collected excess developer is fixed to the liquid recovery blade 107, and the liquid recovery blade 107 needs to be cleaned, resulting in complicated maintenance.

On the other hand, in the excess developer removing device 200 of the other example described above, the tip of the nozzle 204a of the blower 204 is the developer 203 as the excess developer removing means for removing the excess developer adhering to the photosensitive material 201. Developing electrode 203a
7, the excess developer adhering to the photosensitive material 201 is blown off by the air blown from the nozzle 204a during the development on the photosensitive material 20.
As shown in FIG. 5, a part of the excess developer that has been blown away by the air is blown toward the end portion side of the photosensitive material 201 in the transfer direction. By the way, as shown in FIG. 7, the end portion of the photosensitive material 201 on the transfer direction side behind the image portion 201a is generally a non-image portion.
The excess developer adhering to the terminal non-image portion 201b of 01 may not be completely removed by the air from the nozzle 204a of the air blower 204, and the surplus developer adhering here may cause an image during transfer of the photosensitive material 201. When it adheres to the portion 201a, it deteriorates the image quality of the developed visible image. Therefore,
The photosensitive material 201 is not limited to one-color development, but especially when color development is performed through a plurality of development processes.
It is necessary to completely remove the excess developer adhering to the terminal non-image portion 201b.

[0014]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, an excess developing solution removing apparatus according to the present invention is a rotatable rotary drum for winding a photosensitive material having a latent image recorded thereon and transferring the photosensitive material integrally. And a developing device that can move back and forth with respect to the rotating drum, and the latent image that has been recorded in a state where the developing device is brought close to the rotating drum is converted into a visible image with the developer supplied from the developing device. At the time of development, an excess developer adhering to the photosensitive material is removed by air blown from a nozzle provided downstream of the developing device in the transfer direction of the photosensitive material to remove excess developer, and the photosensitive material is removed from the nozzle. An excess developing solution absorbing member wound in a roll shape is provided upstream of the conveying direction side of the nozzle so that a part of the excessive developing solution absorbing member is brought into contact with the transfer direction side end portion of the photosensitive material, By air from It is characterized in that it has configured to remove excess developer were received blown to the end portion.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the excess developer removing device according to the present invention will be described in detail below with reference to FIGS.

FIG. 1 is a block diagram for explaining an excessive developing solution removing device according to the present invention, and FIG. 2 is a perspective view showing a terminal end excessive developing solution removing device which is a main part of the excessive developing solution removing device. 3 (A) and 3 (B) are views for explaining the operation of the same excess developer removing device, and FIG. 4 is a timing chart showing the operation timing of the main parts of the same excess developer removing device. .

The excess developer removing device 1 according to the present invention shown in FIG. 1 is constructed as a wet electrophotographic device.
A photosensitive material 2 is mounted in a state of being rolled into a roll in the excess developer removing device 1. The photosensitive material 2 is composed of a pair of rollers 3 and a pair of rollers 4 and is a rotary drum described below. 6, is further pressed against the rotating drum 6 by the pressing roller 5, and the suction force is applied by the operation of a suction device (not shown) in the rotating drum 6, while the rotating drum 6 is wound around the rotating drum 6. And is integrally rotated in the counterclockwise direction (direction of arrow A) in the figure. After that, the photosensitive material 2 is cut into a predetermined length by a cutter 7 provided between the rollers 3 and 4.

The photosensitive material 2 transferred integrally with the rotary drum 6 is a charger 8 provided upstream of the photosensitive material 2 in the transfer direction.
Thus, the rotary drum 6 is uniformly charged as the rotary drum 6 rotates.
Then, the image signal output from the semiconductor laser 9 is rotated by the rotatable polygon mirror 10 to the shaft 6a of the rotary drum 6.
Is scanned line by line to irradiate the charged photosensitive material 2 through the lens 11 and the reflecting mirrors 12 and 13 sequentially to perform exposure, and an electrostatic latent image corresponding to an image signal is recorded as a charge image. are doing.

Further, a pre-bath 14 for eliminating unevenness in concentration is provided downstream of the charger 8 in the transfer direction of the photosensitive material 2, and the pre-bath taken in from a liquid supply means (not shown) is provided.
It is poured onto the outer peripheral surface of the roller 14a and applied so as to cover the charge image.

Further, downstream of the front bath 14 in the transfer direction of the photosensitive material 2, a terminal portion excess developer removing device 15 which is an essential part of the present invention is detachably provided. The excess developer removed at the end portion 15 is blown to the end non-image portion 2b (FIG. 7) which is the end portion of the photosensitive material 2 on the transfer direction side by the air from the nozzle 48a of the blower 48 described later. The nozzle 4 of the blower 48 has a function of removing the liquid.
8a is provided upstream of the photosensitive material 2 in the transfer direction.

The excess developer removing device 15 at the end portion is shown in FIG.
As shown in the enlarged view of FIG. 1, the first base 16 installed along the rotary drum 6 is provided with a first base plate 16 between the side plate parts 16a and 16b.
The shaft 17, the second shaft 18, and the third shaft 19 are the shaft 6 of the rotary drum 6.
It is installed in parallel with a. The first shaft 17 is provided on the rotary drum 6 side, and the second shaft 18 is provided on the side plate portions 16a and 16a.
The third shaft 19 is provided below the middle portion of the rotary drum 6b.
It is provided away from the side.

Here, the first shaft 1 provided on the rotary drum 6 side
One end of a pair of arms 20 and 20 is fixed to the arm 7 with a space therebetween. The pair of arms 20 and 20 hangs downward, and a guide member 21 is provided between the other ends of both arms 20 and 20. Are laid across substantially parallel to the shaft 6a of the rotary drum 6. Further, one end side of the excess developer absorbing member 22 wound in a roll shape is fixed to the second shaft 18, and the excess developer absorbing member 22 is rotatably provided integrally with the second shaft 18. There is. At this time, the second shaft 18 functions as a supply shaft for the excess developer absorbing member 22. Further, the excess developer absorbing member 22 uses a non-woven fabric or the like in order to efficiently absorb the excess developer attached to the terminal non-image portion 2b (FIG. 7), which is the transfer-direction-side terminal portion of the photosensitive material 2. . Also,
With the excess developer absorbing member 22 wound around the second shaft 18, the other end of the excess developer absorbing member 22 is pulled out, and the pulled-out portion is placed horizontally between the other ends of the pair of arms 20, 20. The excess developing solution absorbing member 22 is fixed to the third shaft 19 after the other developing agent absorbing member 22 is fixed to the third shaft 19 after being extended to the guide member 21 and further to the first shaft 17. Is laid so as to wrap around the guide member 21 and the first shaft 17. At this time, the third shaft 19 functions as a winding shaft for the excess developer absorbing member 22.

On the outer side of the side plate portion 16b of the base stand 16, a small pulley 23, a coupling 24,
A motor 25 is provided to couple the second shaft 18 with the coupling 2
6, a motor 27 is provided, and a large pulley 29 in which a one-way clutch 28 is fitted to the third shaft 19 is provided, and further, a small pulley 23 fixed to the first shaft 17 and a third pulley 19 are fixed to the third shaft 19. A belt 30 is stretched around the large pulley 29. At this time, the motor 25 connected to the first shaft 17
As will be described later, the pair of arms 2 fixed to the first shaft 17
The function of rotating the side of the guide member 21 that is laterally extended between the other ends of 0 and 20 around the first shaft 17 in the counterclockwise direction so as to extend below the rotary drum 6, and to wind the third shaft 19 around the third shaft 19. It also has a function of winding the other end side of the excess developer absorbing member 22. On the other hand, the motor 27 connected to the second shaft 18 has a function of applying back tension to the excess developer absorbing member 22 and has a function of rotating counterclockwise when the motor 25 connected to the first shaft 17 is deactivated. It has a function of returning the other end side of the pair of moved arms 20, 20 to the original position.

Excessive developer removing device 1 at the terminal end having the above-mentioned structure
The operation of No. 5 will be described in detail in the operation of the excess developer removing device 1 described later.

Returning to FIG. 1 again, one of a plurality of developing devices 31 to 34 is provided just below the rotary drum 6 at the downstream side in the transporting direction of the photosensitive material 2 with respect to the terminal excess developer removing device 15. Reference numeral 31 (to 34) is provided so as to be capable of advancing and retracting (moving up and down) in the vertical direction (arrow B ₁ , B ₂ direction) with respect to the rotary drum 6. These plural developing devices 31 to 34 are provided with long developing electrodes 31 a to 34 provided along the shaft 6 a of the rotating drum 6.
When the electrostatic latent image recorded on the photosensitive material 2 is color-developed into a visible image, the developing device 31 is a developer for yellow (Y) and the developing device 32 is a magenta. A developing solution for (M), a developing device 33 for cyan (C), and a developing device 34 for black (B) are prepared. Then, among the plurality of developing devices 31 to 34, one developing device 31 (to 34) is selectively mounted on a developing device mounting table 39 described later. Here, when the electrostatic latent image recorded on the photosensitive material 2 is developed for each color, the developing device advancing / retreating means 35, which will be described later, moves the developing device 31 for yellow (Y) of the first color to just under the rotary drum 6. The developer for yellow (Y) is brought into contact with the photosensitive material 2 from the developing electrode 31a in the developing device 31 to develop the electrostatic latent image into yellow, and thereafter, each time the rotary drum 6 rotates once. Developing device 3 for magenta (M)
2, the developing device 33 for cyan (C) and the developing device 34 for black (B) can sequentially and repeatedly perform color development.

The developing device advancing / retreating means 35 comprises a base 36.
Multiple guide shafts on top (only two shown) 37,3
8 is erected, and these plural guide shafts 37, 3
A developing device mounting table 39 for selectively mounting a plurality of developing devices 31 (to 34) on the 8 is vertically movable. Further, a cam support plate 40 is erected on the base table 36, and on the cam support plate 40, a motor 41 as a drive source and a rotary shaft 42 which is rotationally driven via a reduction means (not shown) are rotatable. Supported by. A developing device advancing / retreating cam 43 is fixed to the rotating shaft 42. Further, a substantially doglegged lever 44 for advancing and retracting the developing device is supported on the cam support plate 40 so as to be rotatable about a shaft 45, and the lever 44 for advancing and retracting the developing device is used for developing at one end portion. A roller 46 that abuts on the device mounting table 39 and a cam follower 47 that abuts on the developing device advancing / retreating cam 43 are provided at an intermediate portion. And
When the developing device advancing / retreating cam 43 is rotated, a cam follower 47 provided at an intermediate portion of the developing device advancing / retreating lever 44 rotates about the shaft 45 along the developing device advancing / retreating cam 43. The developing device mounting table 39 on which the developing device 31 (to 34) is mounted is moved up and down via a roller 46 provided at one end portion of the lever 44.

Further, a blower 48 equipped with a nozzle 48a for blowing air is developed downstream of the one developing device 31 (to 34) which has risen to a position just below the rotary drum 6 in the transfer direction of the photosensitive material 2. Developing electrode 31a in the container 31 (to 34)
The image area 2 of the photosensitive material 2 is provided by the air from the nozzle 48a of the blower 48 while the photosensitive material 2 is being developed by one developing device 31 (to 34).
The excess development attached to a (FIG. 7) is blown off. At this time, a part of the excess development blown off by the air is blown to the end non-image portion 2b (FIG. 7) which is the end portion in the transfer direction side of the photosensitive material 2 as the photosensitive material 2 is transferred in the arrow A direction. Tend to be.

Further, downstream of the nozzle 48a of the blower 48 in the transfer direction of the photosensitive material 2, a drying 49 for drying the developed photosensitive material 2 and a removal for removing the electric charge of the charged photosensitive material 2 are provided. The electric appliances 50 and 50 are provided respectively. Furthermore,
A pair of rollers 51 is provided on the upper left side of the rotary drum 6 in the figure for discharging the photosensitive material 2 which has been developed.

Here, the operation of the excess developer removing device 1 by the terminal end excess developer removing device 15, which is the essential part of the present invention, will be described with reference to FIGS.

As shown in FIGS. 1 to 3A, when the developing device advancing / retreating cam 43 of the developing device advancing / retreating means 35 is rotated,
As the developing device advancing / retreating cam 43 rotates, the developing device advancing / retreating lever 44 rotates in the upward direction, so that the developing device 31 for the first color yellow (Y) mounted on the developing device mounting base 39 is indicated by the arrow B.
It moves in _one direction and rises to just below the rotary drum 6.
Then, after the developing device 31 is lifted, the developing electrode 31a in the developing device 31 is attitude-controlled with respect to the rotary drum 6 at a predetermined angle by an attitude control means (not shown) over time, as shown in FIG. . Of course, the developing device advancing / retreating cam 43 continues to rotate during the attitude control of the developing electrode 31a. Then, when the attitude of the developing electrode 31a in the developing device 31 is controlled at a predetermined angle with respect to the rotating drum 6, the electrostatic latent image is formed using the yellow (Y) developer supplied from the developing electrode 31a. The first color yellow (Y) for the photosensitive material 2 on which is recorded
Development is started. When the development of the yellow (Y) of the first color is started, the air blown from the nozzle 48a of the blower 48 near the developing electrode 31 in the developing device 31 causes the image portion 2a of the photosensitive material 2 (see FIG. 7). 2) is blown off and collected in the developing device 31. On the other hand, when the photosensitive material 2 is rotatably transferred together with the rotary drum 6 in the direction of the arrow A, a part of the excess developing solution blown off by the air is transferred to the end non-image portion 2b (FIG. 7) on the transfer direction side of the photosensitive material 2. ). Then, the image portion 2a of the photosensitive material 2
At the time when the development of the first color on (FIG. 7) is completed, the rotary drum 6 temporarily stops its rotation so that the terminal non-image portion 2b of the photosensitive material 2 faces the developing electrode 31a in the developing device 31. To the position you did.

Further, during the development of the first color on the image portion 2a (FIG. 7) of the photosensitive material 2, the terminal portion excess developer removing device 15 which is a main part of the present invention does not operate and the state shown in the figure is shown. Waiting at

Next, as shown in FIG. 3B, the photosensitive material 2
At the time when the development of the first color onto the developing device 31 is completed, the developing device 31 is retracted from the rotary drum 6 by the developing device advancing / retreating means 35 and is indicated by arrow B
It descends in _two directions. Then, as the developing device 31 descends, a space is formed below the rotary drum 6. Of course, the terminal non-image portion 2b (FIG. 7) of the photosensitive material 2 remains below the rotary drum 6.

On the other hand, in the terminal portion excess developer removing device 15 which is the main part of the present invention, the development of the first color on the photosensitive material 2 is completed,
When the developing device 31 descends, it operates as shown in FIG.

That is, as shown in FIGS. 2 and 3B,
First, the motor 25 connected to the first shaft 17 is operated (ON)
Then, when the first shaft 17 is rotated in the counterclockwise direction, the guide member 21 mounted laterally between the other ends of the pair of arms 20, 20 fixed to the first shaft 17 is counterclockwise about the first shaft 17. Direction of the photosensitive material 2 and a part of the surplus developer absorbing member 22 which is rotated around the guide member 21 and extends to the space formed below the rotating drum 6 by the retracting of the developing device 31. It abuts the portion 2b (FIG. 7). Here, the rotating drum 6
Is rotated again in the direction of the arrow A, the excess developing solution blown by the air to the terminal non-image portion 2b of the photosensitive material 2 becomes
It is efficiently absorbed, that is, removed by a part of the excess developer absorbing member 22 that is in contact with the terminal non-image portion 2b of the photosensitive material 2 for a short time.

On the other hand, when the first shaft 17 rotates counterclockwise, the rotation of the small pulley 23 fixed to the first shaft 17 is transmitted to the large pulley 29 fixed to the third shaft 19 via the belt 30. . Here, the one-way clutch 2 is attached to the large pulley 29.
8 is fitted, and the one-way clutch 28 is fitted so that the driving force is transmitted only when the third shaft 19 rotates in the same counterclockwise direction as the first shaft 17. The other end of the excess developer absorbing member 22 wound around the triaxial 19 is wound up. That is, the excess developer absorbing member 22 is the first shaft 1
It is wound up with the counterclockwise rotation of 7, and a part of the excess developer absorbing member 22 is constantly renewed to an unused portion. When the other end side of the excess developer absorbing member 22 is wound around the third shaft 19, the motor 27 connected to the second shaft 18 is operated to rotate the second shaft 18 clockwise, Back tension is applied to the excess developer absorbing member 22.

When the removal of the excess developer adhering to the terminal non-image portion 2b (FIG. 7) of the photosensitive material 2 is completed, the motor 25 connected to the first shaft 17 is deactivated (OFF), and When the motor 27 connected to the second shaft 18 is continuously operated to rotate the second shaft 18 in the clockwise direction, the excess developer absorbing member 22 wound around the second shaft 18 is rotated by the shaft 1.
By being wound by 8, a part of the excess developer absorbing member 22 hung on the guide member 21 is pulled, and the pair of arms 20, 20 rotates clockwise around the first shaft 17. Returning to the original position, the motor 27 is deactivated (OFF) here. At this time, when the first shaft 17 is in the non-actuated state (OFF), the driving force in the rewinding direction is not transmitted to the one-way clutch 28 fitted to the large pulley 29. The side is not rewound.

Then, after the other ends of the pair of arms 20, 20 have returned to their original positions, in other words, after the operation of the end portion excess developer removing device 15 has been completed, the rotary drum 6 1 Magenta (M) for the second color, cyan (C) for the third color, and 4 for the photosensitive material 2 on which the electrostatic latent image is recorded for each rotation.
The color black (B) is repeated in the same manner as above to perform color development. At this time, each time the development of each color on the photosensitive material 2 is completed, the end portion excess developer removing device 15 operates as described above.

As described above in detail, according to the excess developer removing device 1 of the present invention, the photosensitive material 2 on which the latent image is recorded is wound around the rotating drum 6 and is transferred integrally with the rotating drum 6, and When the recorded latent image is developed into a visible image with the developer supplied from the developing device 31 (to 34) brought close to the rotary drum 6, the excess developing liquid adhering to the photosensitive material 2 is removed by the developing device 31.
(-34) Excess developer removed by air blown from a nozzle 48a provided on the downstream side of the photosensitive material 2 in the transfer direction and blown to the end portion 2b of the photosensitive material 2 in the transfer direction by the air from the nozzle 48a. Is configured to be removed by a part of the excess developer absorbing member 22 wound in a roll shape, so that the excess developer can be completely removed over the entire surface of the photosensitive material 2 that has been developed, and the developed visible image. In addition to improving the image quality, the quality and reliability of the excess developer removing device 1 can be improved. Further, since the excess developer absorbing member 22 wound in a roll shape is provided so as to be able to be wound up, when a part of the excess developer absorbing member 22 is brought into contact with the transfer direction side end portion 2b of the photosensitive material 2. Since a part of the excess developer absorbing member 22 is always renewed to an unused portion, the excess developer can be efficiently removed. Furthermore, since the liquid recovery blade used in the conventional wet color electrophotographic copying machine is not used, there is no need to worry about the change over time of the liquid recovery blade.

[0039]

According to the excess developer removing device of the present invention described in detail above, the photosensitive material on which the latent image is recorded is wound around the rotary drum and is transferred integrally with the rotary drum, and the latent image recorded is recorded. When developing an image into a visible image with the developer supplied from the developing device that is close to the rotating drum, the excess developer adhering to the photosensitive material is blown out from a nozzle provided downstream of the developing device in the transfer direction of the photosensitive material. In addition to the removal by air, the excess developer blown to the end portion of the photosensitive material in the transfer direction by the air from the nozzle is configured to be removed by a part of the excess developer absorbing member wound in a roll shape. The excess developing solution can be completely removed over the entire surface of the photosensitive material which has been subjected to the above step, and not only the image quality of the developed visible image can be improved, but also the quality and reliability of the excess developing solution removing apparatus can be improved.
Further, since the excess developer absorbing member wound in a roll shape is provided so as to be able to be wound up, when a part of the excess developer absorbing member is brought into contact with the transfer-direction-side end portion of the photosensitive material, excess developer is developed. Since a part of the liquid absorbing member is constantly renewed to an unused portion, the excess developing liquid can be removed efficiently. Furthermore, since the liquid recovery blade used in the conventional wet color electrophotographic copying machine is not used, there is no need to worry about the change over time of the liquid recovery blade.

[Brief description of drawings]

FIG. 1 is a configuration diagram for explaining an excess developer removing device according to the present invention.

FIG. 2 is a schematic diagram of an excess developer removing device according to the present invention.
FIG. 3 is a perspective view showing an end portion excess developer removing device which is a main part.

FIG. 3 is a diagram for explaining the operation of the excess developer removing device according to the present invention.

FIG. 4 is a schematic diagram of an excess developer removing device according to the present invention.
7 is a timing chart showing operation timings of main part members.

FIG. 5 is a diagram illustrating a part of an example of a wet color electrophotographic copying machine in a conventional example.

FIG. 6 is a view for explaining a part of an excessive developing solution removing device of another example of the conventional example.

FIG. 7 is a diagram showing a state in which the excess developer is blown to the terminal non-image portion of the photosensitive material by the air from the nozzle in the excess developer removing device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Excessive developing solution removing device, 2 ... Photosensitive material, 2b ... Transfer direction side end part (end non-image part), 6 ... Rotating drum, 15 ...
End portion excess developer remover, 22 ... excess developer absorbing member,
31-34 ... Developing device, 48 ... Blower, 48a ... Nozzle.

Claims (1)

[Claims] 1. A developing device comprising: a rotatable rotary drum that winds a photosensitive material having a latent image recorded thereon and transports the photosensitive material integrally; and a developing device that can advance and retreat with respect to the rotating drum. When developing the visible image with the developer supplied from the developing device while the recorded latent image is brought close to the rotating drum, the excess developer adhering to the photosensitive material is transferred from the developing device to the photosensitive material. In the excess developer removing device that removes with the air blown from the nozzle provided on the downstream side in the transfer direction, the excess developer absorbing member wound in a roll shape can be wound upstream from the nozzle in the transfer direction of the photosensitive material. Installed in
A part of the excess developer absorbing member is brought into contact with a transfer-direction-side end portion of the photosensitive material, and the excess developer blown to the end portion is removed by the air from the nozzle. Excess developer removing device.