JP2687786B2 - Transfer roller cleaning device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transfer roller cleaning device such as an electrophotographic device using a transfer roller.

In order to transfer a toner image by the transfer roller, it is necessary to apply a voltage of about several hundred volts to 2 kilovolts to the transfer roller, but roller transfer does not generate ozone like corona transfer, Further, since the adhesion between the toner image forming body and the recording medium is good, the scattering of toner and the disturbance of the image are small.

However, in such a roller transfer method, the transfer roller directly contacts the toner image forming body when the recording medium is not inserted. Therefore, when the recording medium is not conveyed due to the occurrence of jam, the surface of the transfer roller may be significantly soiled.

The surface of the transfer roller is also soiled when toner remains on the toner image forming body even between recording media during initial operation or during continuous printing. In this case, the amount of toner adhered is very small, but the stain becomes severe during long-term use.

Since it is unavoidable that the transfer roller is contaminated with toner as described above, it is necessary to clean the transfer roller.

[0006]

Conventionally, therefore, a cleaning device for cleaning the transfer roller with a blade, a fur brush, or the like, or an electric field in the opposite direction to that at the time of transfer is provided between the transfer roller and the toner image forming body during non-transfer. An attempt has been made to a cleaning device or the like configured to move the toner adhered to the transfer roller to the toner image forming body.

[0007]

However, since the toner adhered to the transfer roller is relatively firmly attached to the transfer roller, sufficient cleaning cannot be performed with a blade or a far brush. Although the cleaning power is strong, there is a drawback that the rotational torque is extremely increased due to the large frictional resistance with the transfer roller.

Further, in the case of forming an electric field in the direction opposite to that at the time of transfer, the toner image forming body directly touches the transfer roller at the gap between the recording sheets during continuous printing, and the toner is transferred to the transfer roller. In the case where the particles are gradually accumulated or when the temperature and the humidity are high, sufficient cleaning is not performed.

In such a case, since a toner having a small amount of charge or a toner charged to the opposite polarity adheres to the transfer drum, even if a voltage having the opposite polarity to that at the time of transfer is applied,
This is because the toner on the transfer drum cannot be moved to the toner image forming body side.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a transfer roller cleaning device capable of stably cleaning not only a normally charged toner adhering to a transfer roller but also an uncharged toner.

[0011]

In order to achieve the above object, the transfer roller cleaning device of the present invention is, as shown in FIG. 1, a toner image forming body 1 having a toner image formed on the surface thereof, and A transfer roller 51 provided in close contact with the back side of the recording medium 100 for transferring the toner image onto the recording medium 100 in contact with the surface of the toner image forming body 1, and the recording from the toner image forming body 1. Medium 10
The transfer roller 5 for transferring the toner image to
A transfer voltage applying means 5 for applying a predetermined transfer voltage to 1;
In order to move the toner adhering to the surface of the transfer roller 51 to the surface of the toner image forming body 1, a voltage having a polarity opposite to the transfer voltage is applied to the transfer roller 51, and then the same polarity as the transfer voltage is applied. And a cleaning voltage applying unit 6 for applying the voltage of 1. are provided, and the surface of the transfer roller 51 may be formed of an elastic layer made of a conductive foam.

Incidentally, it is preferable that the voltage applied to the transfer roller 51 from the cleaning voltage applying means 6 and having a polarity opposite to that of the transfer voltage has a potential difference of 300 to 1700 volts with respect to the toner image forming body 1. A voltage having a polarity opposite to the transfer voltage is applied to the transfer roller 51 from the cleaning voltage applying means 6 while the transfer roller 51 makes at least four rotations, and a voltage having the same polarity as the transfer voltage is applied to the transfer roller 51. From the cleaning voltage applying means 6 to the transfer roller 5 during at least one rotation.
1 is preferably applied.

The toner image forming body may be a photosensitive drum 1 provided so that an electrostatic latent image is formed on the surface thereof and then the electrostatic latent image is developed with toner, or The toner image forming body receives the toner image transferred from the photosensitive drum 1 and transfers the toner image to the recording medium 10.
It may be the intermediate transfer member 101 that transfers 0.

[0014]

Operation: Cleaning voltage applying means 6 to transfer roller 5
First, by applying a voltage having a characteristic opposite to the transfer voltage, the normally charged toner moves from the transfer roller 51 to the toner image forming body 1.

Then, the cleaning voltage applying means 6
By applying a voltage having the same characteristic as the transfer voltage to the transfer roller 51, the toner charged to the opposite polarity and the toner insufficiently charged (changed to the opposite polarity charging by applying the voltage having the opposite characteristic) Moves from the transfer roller 51 to the toner image forming body 1.

[0016]

An embodiment will be described with reference to the drawings. FIG.
FIG. 3 shows a laser printer to which the present invention is applied, and FIG. 3 shows its image forming unit.

The photosensitive drum (toner image forming body) 1 is rotationally driven at a constant speed by a main motor 20 and uniformly charged by a charger 2, and then an image is exposed by an image exposure device 3, here a laser optical system. As a result, an electrostatic latent image is formed on the photosensitive drum 1 by electric charges. This image is developed by the developing device 4 to form a toner image 10 on the photosensitive drum 1.

In the apparatus of this embodiment, as the photosensitive drum 1, an organic photosensitive member (O) having an A3 paper size width and an outer diameter of 40 mm is used.
PC), uniformly charged to negative (−600 V) by the charger 2 and exposed by the image exposure device 3, and then negatively charged (−10 μC / g) toner by the non-magnetic one-component developing device 4. Are developing. The peripheral speed of the photosensitive drum 1 is 70 mm /
s.

A recording sheet 100 is provided on the surface of the photosensitive drum 1.
And the transfer roller 51 is conveyed so that the recording paper 1
The recording paper 100 is pressed against the photosensitive drum 1 in close contact with the back surface of the recording paper 100.

Then, the toner image 10 on the surface of the photosensitive drum 1
Is transferred onto the recording paper 100 by the transfer roller 51,
The fixing device 9 fixes the recording paper 100. On the other hand, the charge and residual toner on the photosensitive drum 1 are removed by the static eliminator 7 and the cleaner 8.

FIG. 4 is a perspective view showing the photosensitive drum 1 and the transfer roller 51 portion. The transfer roller 51 has an outer diameter of 2
2 mm, stainless steel metal shaft 51a with an outer diameter of 10 mm
A conductive foam body of closed cells is lined as a conductive elastic layer 51b.

As the conductive foam, a polyurethane foam, a silicone foam, an ethylene propylene foam or the like can be used, and a conductivity imparting agent such as carbon black is added to the foam material.

By thus forming the transfer roller 51 with the elastic body made of foam, it is possible to prevent the toner from sticking to the transfer roller 51, and as a result, the toner is moved from the transfer roller 51 by the electrostatic force. Can be made. Further, by using the closed-cell foam as the foam, it is possible to prevent the toner from entering the inside of the foam.

The transfer roller 51 supports a metal shaft 51a exposed at both ends by bearings 53. A spring 54 is attached to the bearing 53, and a load is applied to press the transfer roller 51 against the photosensitive drum 1. The bearing 53 used here has conductivity, and a bias voltage is applied to the transfer roller 51 from the power supply 52 via the bearing 53 and the spring 54.

In order to transfer the toner image 10 on the photosensitive drum 1 onto the recording paper 100, the transfer roller 51 is supplied with a power source 52.
Therefore, the toner image 10 is applied to the recording paper 1 by applying a bias voltage having a polarity opposite to that of the toner charge, that is, a negative bias toner is used in this embodiment.
00 is electrostatically adsorbed on and transferred.

On the other hand, at the time of cleaning, a bias voltage having a reverse polarity to that at the time of transfer is applied to the transfer roller 51,
It is necessary to form an electric field in the direction in which the toner moves from the transfer roller 51 to the photosensitive drum 1 side. Such control is performed by the control circuit shown in FIG.

FIG. 5 shows an embodiment of the control circuit system of the present invention. The control circuit 70 includes a central processing unit (CPU) 71, a read-only memory (ROM) 72 that stores a program for operating procedures of the laser printer, a random access memory (RAM) 73 that stores temporary data and the like. ,
It is a microcomputer including an input / output interface (I / O) 74.

The control circuit 70 has an input / output interface 74.
Via the driver 21 of the main motor 20 and the charger 2
Power source 23, image exposure device driver 33, developing motor 41 driver 42, developing power source 43, transfer power source 5
2 and the driver 6 of the motor 62 for the registration roller 61
Control is performed by sending a signal to 3 or the like. Reference numeral 31 is a laser light source, and 32 is a polygon mirror.

A host controller 80 such as a personal computer or a word processor is connected to the control circuit 70, and a printing operation is performed by a command or data from the host controller 80.

FIG. 6 shows an example of the structure of the transfer power source 52. The transfer power supply 52 includes a positive power supply 52a that operates during transfer, a negative power supply 52b that operates during cleaning, and a changeover switch 52c.

The input signals include a transfer power source ON signal and a transfer polarity switching signal, and these two signals are used to switch the output ON / OFF and the polarity. The positive power supply 52a for the transfer bias is a constant current power supply, and the transfer charge amount is 500
The current value is set to 10 μA so as to be μC / m ² . The negative power source 52b for cleaning bias is a constant voltage power source, and its voltage value is set to -1000V.

7 and 8 are time charts showing the operation of this embodiment. FIG. 7 shows the initial operation when the power is turned on or when the cover of the apparatus is closed. Here, when the control circuit 70 receives a signal of power-on or cover closing, the main motor 20 and the image exposure apparatus 3 are operated. Start the spindle motor that rotates the polygon mirror 32,
The laser light source 31 is caused to emit light so that the entire width of the photosensitive drum 1 is exposed. Then, the starting T of the main motor 20
After 1 second (100 ms), the transfer power-on signal is set to H level, and a negative bias voltage is applied to the transfer roller 51.

Next, in the latter half of the initial operation of T2 seconds (10s), T8 seconds (2s), the polarity is inverted and a positive bias voltage is applied. After that, the initial operation is completed, each motor, laser, transfer power source, etc. are turned off, the READY signal becomes H level, and the printer is in a print waiting state.

FIG. 8 is a time chart showing a normal printing operation. Here, an example of continuous printing of three pages is shown. When the print start signal is received from the host controller 80, the control circuit 70 activates the main motor 20 and the spindle motor, and after the lapse of T1 described above, sets the pre-charge signal and the transfer power-on signal to the H level, and then the charger 2 A bias voltage is applied and a negative bias voltage is applied to the transfer roller 51.

Then, the developing motor 41 is started T3 seconds (320 ms) after the charging portion of the photosensitive drum 1 reaches the developing portion, and the developing bias power source 43 is turned on T4 seconds (100 ms) later. After that, the laser light source 31 blinks corresponding to the image data, and the image is exposed on the photosensitive drum 1. Then, the registration roller 61 is rotated at the timing when the developed image reaches the transfer portion, and the recording paper 100 is sent to the transfer portion.

T5 is the time required for the recording paper 100 to move from the registration roller 61 to the transfer portion,
At this timing, the transfer polarity switching signal is set to H level,
The bias voltage applied to the transfer roller 51 is switched to the positive polarity to transfer the toner image onto the recording paper 100. T6 is the cleaning time before printing, which was 5 seconds.

Then, the transfer polarity is changed to negative after T5 seconds after the registration roller 61 sends out the recording paper 100 of the first page, and the transfer polarity is changed to positive after T5 seconds after the second page is sent.

When the printing up to the third page is completed in this way, the pre-charging and developing are turned off, the laser is turned on,
After the transfer roller 51 is cleaned for T7 seconds (5 seconds) as a transfer negative bias, the printing operation is finished. Here, as indicated by the broken line in the latter half of T7, T9 seconds (2
s) It is more effective to reverse the polarity.

In FIG. 9, after the entire circumference of the transfer roller 51 is soiled with toner, a voltage V _c1 having a polarity opposite to that at the time of transfer for t _c1 seconds is applied, then the polarity is reversed, and t _c2 seconds during transfer. This is the result when cleaning is performed by applying the voltage V _{c2 of the} same polarity and re-adhering the toner on the transfer roller 51 to the photosensitive drum 1.

In the figure, the horizontal axis represents the cleaning voltage V _c1 applied to the transfer roller 51, the vertical axis represents the ratio of the amount of toner adhering to the transfer roller 51 to the amount of toner removed by cleaning, cleaning efficiency and after cleaning. Is the optical density OD of the back stain on the first recording sheet 100. In addition,
Since a constant current power source 52a for transfer is used for V _c2 , 10
It is μA.

In this experiment, an organic photoconductor (OPC) is used for the photosensitive drum 1, a negative (-600 V) is uniformly charged by the charging device 2, the entire surface is exposed by the image exposure device 3, and then the developing device 4 is used.
Then, development was performed using a negatively charged (-10 μC / g) toner.

Then, without passing through the recording paper 100, the transfer roller 51 to which a positive transfer bias (+10 μA) was applied was brought into direct contact, and the entire circumference of the transfer roller 51 was soiled with toner.

After that, the power source 23 of the charger 2 is turned off so that the potential of the photosensitive drum 1 becomes approximately 0 V, and the photosensitive drum 1 is rotated for a fixed time (10 seconds) for the first t.
_A negative voltage V _c1 is applied to the transfer roller 51 for _c1 seconds (8 s), and a transfer bias (+10 μ) is applied for the latter half of t _c2 seconds (2 s).
A) was applied for cleaning.

In order to prevent dirt from accumulating on the transfer roller 51, the cleaning efficiency must be 60% or more, preferably 70% or more, and more preferably 80% or more. Further, the limit at which back stains cannot be almost visually identified is 0.02 or less when the stains are even, 0.015 or less when there is unevenness, and 0.01 or less when the stains cannot be recognized at all.

Therefore, from the result of FIG. 9, in order to obtain the cleaning efficiency of 60% or more and the back stain OD of 0.02 or less, V _c1 is 300 to 1700 V, 70% or more and 0.0.
When it is 15 or less, it becomes 400 to 1500V, and when it is 80% or more and 0.01 or less, it becomes 500 to 1300V.

In FIG. 10, after the entire circumference of the transfer roller 51 is soiled with toner, a reverse polarity voltage V _c1 is applied for the time of t _c1 seconds, and then the polarity is reversed, and the time of transfer is t _c2 seconds. This is the result when cleaning is performed by applying the voltage V _{c2 of the} same polarity and re-adhering the toner on the transfer roller 51 to the photosensitive drum 1.

The total cleaning time t _c1 + t _{c2 is set} to 1
The time t _c2 after polarity reversal was changed to 0 second. In the figure, the horizontal axis is t _c2 and the vertical axis is cleaning efficiency and 1 after cleaning.
The optical density OD of the back stain on the first sheet. Note that V _c1
Was -1000 V and V _c2 was 10 μA.

From these results, t _c2 is 1 in order to obtain a cleaning efficiency of 60% or more and back stain OD of 0.02 or less.
.About.9 seconds, and if 80% or more and 0.01 or less, 2 to 8 seconds. Since one rotation of the transfer roller 51 is about 1 second in this embodiment, one or more rotations, preferably 2 to 8 rotations, of the 10 rotations of the transfer roller 51 required for cleaning are performed after the polarity reversal. I understand that it is good.

In FIG. 11, after the entire circumference of the transfer roller 51 is soiled with the toner, a reverse polarity voltage V _c1 is applied for the time t _c1 seconds, and then the polarity is reversed, and the time t _c2 seconds is transferred. This is the result when cleaning is performed by applying the voltage V _{c2 of the} same polarity and re-adhering the toner on the transfer roller 51 to the photosensitive drum 1.

The time t _c2 after the polarity reversal was set to 2 seconds, and the time t _c1 for applying the reverse polarity was changed. In the figure, the horizontal axis is t _c1 , and the vertical axis is the cleaning efficiency and the optical density OD of the back stain on the first sheet after cleaning. Note that V _c1 is −100
0 V and V _c2 were set to 10 μA.

From this result, t _c1 is 4 in order to obtain the cleaning efficiency of 60% or more and the back stain OD of 0.02 or less.
If the time is not less than 2 seconds and not less than 80% and not more than 0.01, it becomes 8 seconds or more. Therefore, it is understood that the time for applying the reverse polarity voltage may be set to the time required for the transfer roller 51 to rotate 4 rotations or more, preferably 8 rotations or more.

12 and 13 show an embodiment in which the present invention is applied to a full color printer. FIG. 12 shows the image forming section, and the recording of a full-color image is performed in the following procedure.

First, the charger 2 uniformly charges the surface of the photosensitive drum 1. Next, the photosensitive drum 1 is moved by the image exposure device 3.
An electrostatic latent image is formed on the latent image, and toner of each color is attached to the latent image to develop the latent image.

The developing unit 4a is a developing device using yellow, 4b is magenta, 4c is cyan, and 4d is black toner, and develops one color each time the photosensitive drum 1 makes one rotation. When developing any of the four color toners, the other developing devices are separated from the photosensitive drum 1.

The developed toner image is subjected to primary transfer to the intermediate transfer belt 101 by applying a voltage having a polarity opposite to that of the toner to the driving roller 102 at the contact point with the intermediate transfer belt 101. The toner on the photosensitive drum 1 that has not been transferred is removed by the photosensitive member cleaner 8 and returns to the original process position.

This is repeated for four colors, and after all the necessary toner images have been transferred onto the intermediate transfer belt 101, the transfer roller 103 is applied from the back side of the recording paper 100 and a voltage of the opposite polarity to the toner is applied. Then, the secondary transfer to the recording paper 100 is performed.

The intermediate transfer belt 101 after the transfer is 1
During the next transfer, cleaning is performed by applying the intermediate transfer member cleaner 104 that has been separated from the intermediate transfer belt 101. The toner image after the secondary transfer is conveyed to the fixing device 9 and fixed on the recording paper 100.

FIG. 13 is a perspective view of the intermediate transfer belt 101 and the transfer roller 103. The transfer roller 103 has a volume resistivity of about 10 around a metal shaft 106 such as stainless steel.
The rubber or foam has a thickness of ⁴ to 10 ¹² Ω · cm, for example, polyurethane or silicone rubber / chloroprene rubber mixed with a conductivity-imparting agent such as carbon black is lined.

The transfer roller 103 has metal shafts 106 exposed at both ends supported by bearings 107. Bearing 10
7 is provided with a separation / contact mechanism (not shown), which is pressed against the intermediate transfer belt 101 and the roller transfer backup roller 105 after the primary transfer is completed.
Apply a load.

The bearing 107 used here is electrically conductive, and a voltage is applied to the transfer roller 103 from the power supply 108 via the bearing 107. In order to transfer the toner image on the intermediate transfer belt 101 onto the recording paper 100, a voltage having a polarity opposite to the charge charge of the toner is applied to the transfer roller 103 from the power supply 108, that is, when the toner is positively charged, it is negative. If it is negatively charged, a positive voltage is applied to electrostatically attract the toner image to the recording paper 100 to transfer the toner image.

At the time of cleaning, first, a voltage is applied so as to form an electric field in the opposite direction to that at the time of transfer (when the toner is positively charged, a positive voltage is applied) to perform normal toner cleaning. After that, a voltage is applied to the transfer roller 103 (a negative voltage is applied when the toner is positively charged) so that an electric field in the same direction as that at the time of transfer is formed again. I do.

In the present embodiment, the potential of the intermediate transfer belt 101 is set to 0 V when the power is turned on or immediately after the jam is cleared,
By pressing the transfer roller 103 against this, first applying a voltage of the same polarity as the toner and rotating it several times, and then applying a voltage of the opposite polarity to the toner and rotating it several times,
The toner attached to the transfer roller 103 is transferred to the intermediate transfer belt 1
01, and the transfer roller 103 can be cleaned. At this time, the intermediate transfer member cleaner 104
Is brought into contact with the intermediate transfer belt 101, and the intermediate transfer belt 1
01 is cleaned.

A power source for the transfer roller 103 is shown in FIG.
In the same manner as in the first embodiment shown in FIG. 5, the transfer roller 103 can be simply cleaned, and the back surface of the recording paper 100 and the change in transfer characteristics can be used. Can be prevented.

Although the above-mentioned embodiments have been described with respect to the electrophotographic apparatus, they can be applied to an electrostatic recording apparatus which forms an electrostatic latent image with pin electrodes.

[0065]

According to the transfer roller cleaning device of the present invention, a normally charged toner is cleaned by applying a voltage having a polarity opposite to that of the transfer voltage to the transfer roller, and then the same polarity as the transfer voltage is applied. By applying the voltage of, it is possible to clean the toner whose charging state is not normal, so that it is possible to maintain stable cleaning performance without being affected by environmental conditions and toner characteristic changes, and It has an excellent effect that stains and changes in transfer characteristics can be prevented and a stable transferred image can be always obtained.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of the present invention.

FIG. 2 is a configuration diagram of a laser printer according to a first embodiment.

FIG. 3 is a configuration diagram of an image forming unit according to the first embodiment.

FIG. 4 is a perspective view of a transfer unit according to the first embodiment.

FIG. 5 is a control circuit diagram of the first embodiment.

FIG. 6 is a transfer power supply circuit diagram of the first embodiment.

FIG. 7 is a time chart diagram at the time of initial operation of the first embodiment.

FIG. 8 is a time chart diagram during the printing operation of the first embodiment.

FIG. 9 is a diagram showing an experimental result of the first embodiment.

FIG. 10 is a diagram showing the experimental results of the first example.

FIG. 11 is a diagram showing experimental results of the first example.

FIG. 12 is a configuration diagram of an image forming unit of a full-color printer according to a second embodiment.

FIG. 13 is a perspective view of a transfer unit according to a second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Photosensitive drum (toner image forming body) 5 Transfer voltage applying means 6 Cleaning voltage applying means 51 Transfer roller 100 Recording paper (recording medium) 101 Intermediate transfer belt (toner image forming body) 103 Transfer roller

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Masahiro Wano Inventor Masahiro Wano 1015 Kamiodanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture, Fujitsu Limited (72) Inventor Saino Shino 1015 Kamedotachu, Nakahara-ku, Kawasaki City, Kanagawa Prefecture, Fujitsu Limited (72) Inventor Akihiko Ishii, 1015 Kamiodanaka, Nakahara-ku, Kawasaki-shi, Kanagawa, Fujitsu Limited (56) References JP-A-3-69978 (JP, A) JP-A-2-306278 (JP, A) JP Japanese Patent Laid-Open No. 3-154086 (JP, A) Japanese Patent Laid-Open No. 1-185572 (JP, A) Japanese Patent Laid-Open No. 56-91253 (JP, A) Japanese Patent Laid-Open No. 64-35459 (JP, A) Japanese Patent Laid-Open No. 2-282770 (JP , A) JP-A-3-7966 (JP, A) JP-A-3-21974 (JP, A) JP-A-3-32482 (JP, A) JP-A-54-156548 (JP, A)

Claims (5)

(57) [Claims] 1. A toner image formed body to which the toner image Ru formed on the surface (1), a recording medium in contact with the surface of the toner image forming body (1) (1
00), which is provided in close contact with the back surface side of the recording medium (100) in order to transfer the toner image .
The surface is formed by the elastic layer of closed-cell foam
The transferred transfer roller (51) and the toner image forming body (1) to the recording medium (100).
In order to transfer the toner image onto the transfer roller (5
Transfer voltage applying means (5) for applying a predetermined transfer voltage to 1), and the transfer roller for moving the toner adhering to the surface of the transfer roller (51) to the surface of the toner image forming body (1). (51) A transfer roller cleaning device comprising: a cleaning voltage applying unit (6) for applying a voltage having a polarity opposite to that of the transfer voltage and then applying a voltage having the same polarity as the transfer voltage. . 2. A voltage having a polarity opposite to that of the transfer voltage applied from the cleaning voltage applying means (6) to the transfer roller (51) is 300 with respect to the toner image forming body (1).
The transfer roller cleaning device according to claim 1, wherein the transfer roller cleaning device has a potential difference of 1 to 1700 volts. 3. A voltage having a polarity opposite to that of the transfer voltage is applied to the transfer roller (51) from the cleaning voltage applying means (6) while the transfer roller (51) makes at least four revolutions, and is equal to the transfer voltage. The transfer roller cleaning device according to claim 1 or 2, wherein the polarity voltage is applied to the transfer roller (51) from the cleaning voltage applying means (6) while the transfer roller (51) rotates at least once. 4. The toner image forming body is a photosensitive drum (1) provided so that an electrostatic latent image is formed on a surface thereof and then the electrostatic latent image is developed with toner.
The transfer roller cleaning device described in 2 or 3. 5. The toner image forming body is a photosensitive drum (1).
The transfer roller cleaning device according to claim 1, wherein the transfer roller cleaning device is an intermediate transfer member (101) that receives a toner image transferred from the transfer medium and transfers the toner image to a recording medium (100).