JP2625593B2 - Image forming device - Google Patents

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,
The present invention relates to an image forming apparatus that forms an electrostatic latent image on an image carrier such as a photoconductor, develops the electrostatic latent image, and forms an image on paper or the like.

[0002]

As the Related Art This type of image forming apparatus, conventionally, such as an electrophotographic apparatus or an electrostatic printer is known. In these image forming apparatuses, after forming an electrostatic latent image on a photoreceptor, a developer is electrostatically attached to the electrostatic latent image to form a developer image, and then the developer image is printed on paper. The image is formed on this sheet by transferring the image onto the sheet.

In addition, since the electrostatic latent image and the developer that cannot be transferred remain on the photoreceptor after the transfer operation, the remaining developer is removed by a cleaning device, and the electrostatic latent image is further removed. Is removed by the static eliminator.

In recent years, there has been an increasing demand for downsizing of the apparatus. For example, Japanese Patent Application Laid-Open No. 47-11538 discloses means for downsizing by using a single apparatus as a developing apparatus and a cleaning apparatus. It has been disclosed. In one developing device, the electrostatic latent image is developed when the photoreceptor passes there for the first time, and then the electrostatic latent image or the developer remaining after transfer is developed when the photoreceptor passes the second time. Is to be cleaned.

However, in the case of the above-described conventional apparatus, the residual electrostatic latent image and the developer are removed when the photosensitive member passes through the developing device for the second time. The speed of the image forming operation is halved as compared with the case of performing image forming, and an image forming area larger than the size of the entire peripheral surface of the photoreceptor cannot be obtained. However, there is a problem that it is not possible to meet the demand for miniaturization.

On the other hand, US Pat. No. 364,926 discloses that during the first passage of a photoreceptor, development of an electrostatic latent image and
There is disclosed means for solving the drawback relating to the speed of the image forming operation by using a developing device for simultaneously cleaning the developer remaining after the previous transfer.

Generally, in an image forming apparatus, when an image is formed on a sheet, paper dust falls into the inside of the apparatus, and the paper dust attached to the photoreceptor is collected by a cleaning device.

However, in an image forming apparatus having no cleaning device (cleanerless), paper dust adhering to the photoreceptor is collected by the developing device, and the developer inside the developing device deteriorates due to the paper dust, and fogging occurs. And causes various problems such as a decrease in image density.

Such adverse effects of paper dust mixing are more remarkable when the developing means is a contact developing device or the transfer means is a contact transfer device.

When the transfer means is of a contact type, the adhesion of the paper to the image carrier is improved, and the transfer efficiency is improved.
This is an effective transfer method for a cleanerless process without a cleaning device without a decrease in transfer efficiency due to environmental conditions.
However, since the paper is squeezed, paper dust is likely to be generated.

When a contact developing system, particularly a contact one-component developing system using a conductive (resistive) roller, is adopted,
Good cleaning properties are obtained. However, in such a contact developing method, paper dust adhering to the photoreceptor is easily taken into the inside of the developing device, and the paper dust deteriorates the developer inside the developing device, thereby lowering image density and increasing fog. There is a problem.

These problems are caused by the fact that the filler, which is a part of the constituent material of the paper contained in the paper powder, has the same charge polarity as the toner, so that the charge amount of the toner inside the developing device is reduced, and furthermore, It is caused by charging to the opposite polarity.

[0013]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and an image forming apparatus which does not cause a decrease in image density or fog and which can be miniaturized. It is intended to provide.

[0014]

The present invention SUMMARY OF THE INVENTION To solve the above problems, a latent image forming means for forming an electrostatic latent image on an image bearing member, is formed on the image carrier by said latent image forming means When a developer is supplied to the electrostatic latent image to form a developer image,
At the same time , a developing cleaning unit that removes residual developer remaining on the image carrier , and a transfer unit that transfers a developer image formed on the image carrier by the developing cleaning unit onto a member to be transferred. A copying means , on the image carrier after transfer by the transfer means;
Disturbing means for disturbing the residual developer remaining in the image bearing member;
Downstream and forward of the transfer means along the direction of rotation of the carrier
Upstream of the disturbance means, provided in contact with the image carrier.
And, depending on the size of the transferred member,
Opposing area of the image carrier opposing the image forming area of the copying member
Is arranged outside the range, it is characterized in that it has a砕粉removing means for removing砕粉of the transfer target member adhered to the image bearing member with the transcription operation by the transfer hands stage .

[0015]

According to the image forming apparatus having the above-mentioned structure, the crushed powder removing means removes the crushed powder from the transfer member adhered to the image carrier with the transfer operation of the transfer means to the transfer member. , it is possible to prevent the grinding dust from entering the inside of the developing device to clean, which makes it possible to perform image concentration and a decrease headless quality image formation. In addition, the crushed powder
The removing means forms the image according to the size of the member to be transferred.
Since it is located outside the area, the residual developer
Without being able to pass through the steps and not accumulating on the image carrier
Wear of the image carrier can also be prevented.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

The image forming apparatus 1 shown in FIG. 1 has a box-shaped apparatus main body 1a.

At a substantially central portion of the apparatus main body 1a, a photosensitive drum 21 as a small-diameter image carrier having an image forming surface smaller than the area of a formed image is provided rotatably in the direction of arrow A.

The photosensitive drum 21 is made of an organic photosensitive member (O
(PC) -based photoconductive material. In addition, around the photosensitive drum 1 sequentially along the rotation direction thereof,
Transfer residual toner non-patterning means (disturbing means) 2, static elimination means 7, scorotron charger 3, laser device 4, developing cleaning means 5, transfer roller 6 constituting transfer means, and dust removing means to be described later. Paper dust removing means 40 is provided.

The untransferred toner non-patterning means 2 has a brush 2 a made of a fiber (trade name: trader, kainol, etc.) having an electric resistance of 10 ^{3 to} 10 ⁹ Ωcm, and slides on the photosensitive drum 21. They are arranged so as to be in contact with each other, and a voltage of plus 200 to 1200 volts is applied.

The scorotron charger 3 negatively charges the surface of the photosensitive drum 21 substantially uniformly so as to have a voltage of -450 to -800 volts.

The laser device 4 irradiates the surface of the photosensitive drum 21 with a laser beam 8 in accordance with image information to be formed, and forms an electrostatic latent image on the charged area of the photosensitive drum 21. Has become.

The developing and cleaning device 5 includes a hopper 9 for accommodating a so-called one-component developer T having triboelectric charging properties.
A developer transport roller 15 for transporting the developer T in the hopper 9, and the developer T from the developer transport roller 15 is transported toward the photosensitive drum 21, and the developer remaining on the photosensitive drum 21. A developing roller 10 for returning the agent T to the hopper 9 is provided.

The developing roller 10 has a capacity of 10 ^{2 to} 10 ^8.
A conductive surface layer having an electric resistance of Ωcm and an elastic layer made of urethane foam, silicon rubber or the like disposed inside the conductive surface layer are disposed, and constitute an elastic roller as a whole.

An elastic blade 13 made of phosphor bronze, urethane, silicon resin or the like for forming a thin layer while frictionally charging the developer T with respect to the developing roller 10.
Are arranged in a pressure contact state, and the developer T passing through the elastic blade 13 is charged with negative frictional charge of the same polarity as the photosensitive drum 21 to form about one to three developer layers. I have.

The conductive surface layer of the developing roller 10 needs to be selected in consideration of frictional charging with the developer T and appropriate elasticity and friction. Examples of the material of the conductive surface layer include a mixture of urethane resin and conductive carbon at 10 to 30% by weight.

Further, a bias power source (not shown) is connected to the developing roller 10, and the developing roller 10 is electrically connected to the conductive surface layer. As a result, a predetermined developing bias is applied to the developing roller 10 at the time of developing and cleaning, thereby playing a role of preventing the aggregation of the developer T in the hopper 9 and of feeding.

The transfer roller 6 is connected to the photosensitive drum 2
1, it is provided facing the peripheral surface of the photosensitive drum 21 via the transport path 16 of the sheet P as a member to be transferred.

The transfer roller 6 has the same structure as that of the developing roller 10, but the electric resistance of the surface layer is set to about 10 ^{5 to} 10 ¹⁰ Ωcm. This transfer roller 6
To 600 to 20 on the back surface of the paper P being conveyed.
A voltage of 00 volts is applied to electrostatically attract the toner, so that the developer image formed on the photosensitive drum 21 is transferred to the paper P.

Such a contact-type transfer unit exhibits stable transfer characteristics even under humid conditions. Therefore, it has the effect of reducing the amount of transfer residual developer and reducing the load of the cleaning operation. Paper powder is also removed, and the contamination with the developer can be prevented.

The conductive brush 2a of the untransferred toner non-patterning means 2 is rubbed against the photosensitive drum 21, and a voltage of 200 to 1500 volts is applied from a bias power supply (not shown) to the conductive brush 2a on the photosensitive drum 21. The transfer residual developer is temporarily absorbed. Since most of the toner as the transfer residual developer has a negative polarity, it is attracted to the transfer residual toner non-patterning means 2. However, some of the transfer residual toner of the fog toner is positively charged. Pass through without being adsorbed, but do not pose a problem because the amount is small.

The transfer residual toner temporarily adsorbed by the transfer residual toner non-patterning means 2 is applied for a time according to conditions such as the applied bias, the resistance of the conductive brush 2a, the particle diameter of the toner, and the resistance. Positive charges are injected, and are returned to the photosensitive drum 21 by an electric field formed by the conductive brush 2a and the photosensitive drum 21.

The time from when the untransferred toner is attracted to the untransferred toner non-patterning means 2 until the toner is returned to the photosensitive drum 21 after receiving the charge is determined by the particle diameter, resistance, etc. of the toner. Therefore, the distribution has a certain width.

Therefore, the transfer residual toner is non-patterned. The non-patterning of the transfer residual toner also contributes to the mechanical sweeping effect of the conductive brush 2a. However, not all the toner is returned to the photoconductor 21, but is gradually accumulated in the conductive brush 2a.

The toner returned to the photosensitive drum 21 has a positive charge having a polarity opposite to the normal polarity. However, when the photosensitive drum 21 is charged by the scorotron transfer device 3, it is exposed to a negative corona. The toner also has a negative polarity and is cleaned by the developing cleaning device 5.

Next, the resistance of the conductive brush 2a will be described. If the resistance of the conductive brush 2a is too large, the response of the potential of the tip of the conductive brush 2a becomes poor, and the time constant of the operation of charging the toner, injecting the charge, and returning the toner to the photosensitive drum 21 increases, and the high-frequency line Untransferred images cannot be sufficiently de-patterned, or the photosensitive drum 21
Toner cannot be returned sufficiently to the toner, and problems such as an increase in toner accumulation occur.

If the resistance of the conductive brush 2a is too low, the bias current leaks to the photosensitive drum 21 and causes the photosensitive drum 21 to be destroyed. Therefore, the resistance of the conductive brush 2a is 10 ^{3 to} 10 ⁹ Ωc.
m is desirable.

Further, the photosensitive drum 21 is also positively charged by the conductive brush 2a.
The charging device 3 varies depending on the amount of toner remaining after transfer.
Is preferably a scorotron charger as in this embodiment.

As described above, since the adsorption-sweep of the transfer residual toner is performed in a short cycle, the amount of the toner remaining on the conductive brush 2a is very small.

However, when the image forming operation is continuously performed,
The attracted toner gradually accumulates, and when the amount exceeds the allowable amount, the toner is scattered, or the conductive brush 2a suddenly discharges a large amount of toner, causing problems such as image defects.

The arrangement of the untransferred toner non-patterning means 2 is set above the photosensitive drum 21 or
By making the developing means 5 closer to the upper side, it is possible to reduce the possibility that the developer T attached to the conductive brush 2a falls and scatters in the machine.

On the other hand, the paper dust removing means 40 provided between the transfer roller 6 and the transfer residual non-patterning means 2 is arranged corresponding to the width of the paper P, The paper dust generated on both end edges of the sheet and adhered to the photosensitive drum 21 is removed. This paper dust removing means 40
Will be described in detail later.

Below the photosensitive drum 21, there is provided a paper feed unit 19 for supplying the paper P to the transport path 16. The paper P to which an image is to be transferred is stored in the paper supply unit 19. Above the paper feed unit 19, the paper P is transported from the paper feed unit 19 to the transport path 1 by a rotation operation.
There is provided a paper feed roller 20 for supplying the paper to the paper feed roller 6.

The transport path 16 is provided with a fixing device 22 for fixing the toner image transferred onto the sheet P, and fixes the toner image on the sheet by heat and pressure.

Next, an operation of forming an image on a sheet P in this embodiment will be described.

The photosensitive drum 21 is rotated in the direction of arrow A, and the peripheral surface of the photosensitive drum 21 is
To about -450 to 80 volts. continue,
The charged area of the photosensitive drum 21 is exposed by irradiating the laser beam 8 from the laser device 4 to form an electrostatic latent image on the surface of the photosensitive drum 21.

The toner T is supplied to the electrostatic latent image from the developing roller 10 of the developing means 5. That is, the developing roller 10 is elastically contacted with the photosensitive drum 21 with a nip width due to deformation, and adheres the toner T to form a toner image.

In this case, the toner T adheres to the above-described irradiation area of the laser beam 8 and is subjected to so-called reversal development.

The toner T is applied to the blade 13 and the conductive surface layer of the developing roller 10 by friction between about -5 to 3
It is charged to 0 μc / g (microcoulomb / gram), and a voltage of about −150 to 450 volts is applied to the developing roller 10.

The developed toner image is then conveyed to a transfer area facing the transfer roller 6. On the other hand, in the transfer area,
The paper P is sent from the paper supply unit 19 in synchronization with the rotation of the photosensitive drum 21 by the rotation of the paper supply roller 20.

The back side of the sheet P is charged to a positive polarity by the transfer roller 6. Therefore, the toner image on the surface of the photosensitive drum 21 is electrostatically attracted to the paper P and transferred. Here, a voltage of 600 to 2,000 volts is applied to the rotation shaft by a bias power supply to the transfer roller 6, and a conductive material obtained by mixing conductive carbon with 5 to 40 weight percent of silicon resin provided at both ends of the transfer roller 6 is used. Through the part, 10 ^{5 to} 1 on its surface
A voltage is applied to the conductive surface layer of ⁰⁹ Ωcm.

In the transfer system using the transfer roller 6, the transfer system shown in FIG.
As shown in (1), the transfer efficiency does not depend on the environment (especially humidity). On the other hand, in the corona transfer, as shown in FIG. 7, the transfer efficiency is significantly reduced in a humid environment. This is the largest cause of poor cleaning of the so-called cleanerless image forming apparatus 1 having no cleaning device as in the present embodiment.

From the above, the roller transfer method is very effective in a cleanerless process, and the same can be said for a contact type transfer means using a brush or the like.

By the way, on the surface of the photoreceptor drum 21 after the transfer, a toner image and an electrostatic latent image, which are slightly transferred but not completely transferred, remain. These toner images and electrostatic latent images are conveyed to the untransferred toner non-patterning means 2 to be non-patterned. In the transfer remaining non-patterning means 2,
The conductive brush 2a is brought into contact with the toner image and the electrostatic latent image to exert an electrostatic and mechanical force, thereby disturbing the toner image and the electrostatic latent image minutely remaining until the state of poor reading.

The toner T scattered on the surface of the photosensitive drum 21 is distributed in a sufficiently small mist state and no longer has information as characters or images.

The electrostatic latent image remaining on the photosensitive drum 21 is erased by the charge eliminating means 7 (for example, a red LED).
Return to the charging step. The photoreceptor drum 21 charged by the scorotron charger 3 is exposed by the laser device 4 after charging to form an electrostatic latent image, and reaches the developing cleaning position facing the developing cleaning unit 5 again (for the second time).

In this case, in the electrostatic latent image formed for the second time, also in the exposed portion (image portion to which toner is to be attached) and the non-exposed portion (non-image portion). Since the residual toner has been greatly reduced by the roller transfer and the residual toner has been scattered almost uniformly and sufficiently thin in advance, exposure unevenness does not occur.

Therefore, in the second development,
Since the residual potential after exposure becomes uniform, a uniform toner image can be obtained. Here, as described above, the developing roller 1
0 has an elasticity of 30 ° to 70 ° in JIS rubber hardness measurement method and a conductivity of 10 ^{2 to} 10 ⁸ Ωcm, so that a linear load of 20 to 50 g is applied to the developing roller 10.
/ Cm and a contact width (nip) of 1 to 4 mm is generated by pressing and sliding with a speed difference of 1.5 to 4 times. In this nip, the residual toner and the developing roller 11 The toner T is rubbed and disturbed.

As a result, a strong frictional force is generated, and the cleaning ability of the developing cleaning means 5 is enhanced. Moreover, since the developer is formed only with the toner T, the image quality does not deteriorate in the form of streaks or burrs. Further, in the non-exposure section, the toner T attached to the photosensitive drum 21 because the suction force by the developing bias is higher than that of the photosensitive drum 21 is sequentially attracted to the developing cleaning device 5 and collected. That is, by applying an appropriate value of a developing bias (−150 V to −450 V in the embodiment) between the residual potential of the exposed portion and the potential of the non-exposed portion to the developing roller 10, New toner adheres to the exposed portion, and at the same time, residual toner adhered to the non-image region (non-image portion) is attracted to the developing roller 10 from here and is collected.

In this case, since the residual toner is small and is dispersed in a small mist in advance in the transfer residual toner non-patterning means 2, the developing and cleaning device 5 can efficiently collect the residual toner. No defects occur. In this way, the photosensitive drum 21 is rotated and used repeatedly to form one image.

In the contact one-component developing method as shown in the present embodiment, since the developing electrode is close to the photosensitive drum 21, a magnetic brush developing method generally used conventionally (two-component, It is known that the cleaning performance is higher than that of the magnetic one component).
By combining the component development and the contact transfer method, it is possible to perform good printing without a decrease in image density or fog in a cleanerless process.

The conductive brush 2a temporarily removes the transfer residual toner and causes the toner to be reattached to the photoreceptor 21 by injection of electric charge, thereby making the pattern non-patterning. A polar DC bias is applied to the conductive brush 2a.

It has already been described that a lot of toner temporarily adsorbed on the conductive brush 2a adheres again to the photosensitive drum 21 but does not partially adhere again and gradually accumulates on the conductive brush 2a. It is done.

For this reason, in this embodiment, when the image forming start operation, the end operation, and the power supply of the apparatus are turned on, the conductive brush 2
Operation of discharging toner accumulated in a (discharge mode)
It is carried out.

In the discharge mode, it is preferable to apply a bias so as to positively sweep out the accumulated toner.

For example, -200 to -800 V having a polarity opposite to the bias applied during the printing operation (normal mode).
It is also effective to apply such a bias or to turn the bias on and off little by little (DC discharge mode). However, even if such measures are taken, if printing including many portions with high image density is repeated, toner is accumulated on the conductive brush 2a, and toner scattering occurs.

In the discharge mode, when an AC bias is applied, the toner which has considerably entered the conductive brush 2a can be sufficiently discharged, and the accumulation of the toner in the conductive brush 2a can be eliminated. As a proper AC bias, the voltage is 300 to 700 Vrms,
Frequency is 100 ~ 2kHz, weight DC component is +300
To -300V.

In a printing mode other than the discharge mode, good non-patterning can be performed even when the AC bias is applied.

A continuous printing test was performed using the image forming apparatus 1. After printing 2000 sheets, paper P
Fog increased at both ends, and the fog area gradually expanded toward the center of the paper, and the image density decreased from 1.4 to 1.2. When the end of the sheet P was taped and the fog on the drum Fd was sampled, as much as 10% of the fog on the drum Fd was generated. Note that the fog on the drum Fd is calculated as in the following equation. The initial fog on drum Fd was 1.6%.

Fd = (Reflectance when a tape is pasted on white paper−Reflectance when a sample is pasted on white paper) At the start of the test, the charge amount Q of the toner layer formed on the developing roller 10 is shown in FIG. It measured using the apparatus as shown in FIG.

The suction nozzle 30 having the rectangular opening 30 a shown in FIGS. 2 and 3 is connected to the suction device 34 and sucks the toner T formed on the developing roller 10. When the toner T is sucked, the mirror image charge of the toner T flows from the developing roller 10 to the ground. Further, by measuring the weight difference Δm of the toner T before and after suction, the toner charge amount Q is calculated by Q = q / Δm.

The initial toner charge amount Q according to this measurement method
Was -8.3 [mu] c / g. However, the toner charge amount Q after 2,000 sheets is almost unchanged at −7.5 μc / g at the center of the developing roller 10, whereas the toner charging amount Q at the end of the developing roller 10 (the edge of the paper P is The contacted portion) has a remarkable toner charge Q of -4.5 μc / g.
Decreased. When the toner T inside the developing and cleaning means 5 was analyzed after the completion of 2,000 sheets, paper dust was mixed in. Further, when the surface of the developing roller 10 was analyzed, the end (the edge of the paper P was in contact ), Adhesion of paper powder was observed. It is considered that this is because the edge portion of the paper P is easily rubbed and paper dust is easily generated.

[Embodiment 1] A paper dust removing blade 41 as a paper dust removing means 40 is provided between the transfer roller 6 and the transfer residual non-patterning means 2. As shown in FIG.
The paper dust removal blade 41 is provided outside the print area of the paper P, and moves the position of the paper dust removal blade 41 when printing paper P of different sizes.

As a result of the continuous printing test, as shown in FIG. 8, no increase in fog was observed at both edges of the 2,000 sheets of printed paper P, and a good image was obtained. When the fogging on the photosensitive drum 21 was sampled by taping, it was 2.1%.

At this time, the image density remained at 1.4 as shown in FIG. The toner charge amount Q was −7.6 μc / g at the center of the developing roller 10,
At the end of 0, there was almost no change at -7.4 μc / g.

[Embodiment 2] A pair of paper dust removing brushes 42 is provided as the paper dust removing means 40 between the transfer roller 6 and the transfer residual non-patterning means 2. As shown in FIG. 5, the paper dust removing brush 42 is disposed outside the print area of the paper P, fixes its position according to the paper size for A4 and B4, and passes the paper P of B4. In this case, the A4 paper dust removing brush was not brought into contact with the photosensitive drum 21.

A continuous printing test was performed in the same manner as in Example 1. As a result, no increase in fog was observed at both edges of the 2,000 sheets of printed paper P, and a good image was obtained. When the fogging on the photosensitive drum 21 was sampled by taping, it was 2.0%. At this time, the image density remained at 1.4. The toner charge amount Q is −7.5 μc / g at the center of the developing roller 10,
At the end of -7.4 μc / g, there was almost no change.

The present invention is not limited to the embodiment described above, and various modifications are possible within the scope of the invention.

For example, in the above-described embodiment, the case where the contact one-component developing means is used as the developing and cleaning means has been described as an example. However, in the image forming apparatus using other developing means such as two-component developing as the developing and cleaning means. Can also be applied.

As the paper dust removing means, an apparatus using a suction machine and a suction nozzle shown in FIG. 2 can be used in addition to the paper dust removing blade and the paper dust removing brush described above.

[0081]

According to the present invention described above, in a so-called cleaner-less image forming apparatus, by providing the dust removing means, it is possible to form a good image without fog without lowering the image density. And an image forming apparatus capable of performing the above.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of an apparatus according to an embodiment of the present invention.

FIG. 2 is a side view of an apparatus for measuring a toner charge amount.

FIG. 3 is a perspective view of a suction nozzle in an apparatus for measuring a toner charge amount.

FIG. 4 is an explanatory diagram of an arrangement of paper dust removing means in the apparatus according to the embodiment of the present invention.

FIG. 5 is an explanatory diagram of an arrangement of paper dust removing means in the apparatus according to the embodiment of the present invention.

FIG. 6 is a graph showing the relationship between transfer efficiency, temperature, and humidity in roller transfer.

FIG. 7 shows transfer efficiency, temperature,
Graph showing the relationship with humidity

FIG. 8 is a graph showing the relationship between the number of printed sheets and the toner charge amount, fog, and image density.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Image forming apparatus 5 Developing cleaning means 6 Transfer roller 21 Photoreceptor drum 40 Paper dust removing means

Claims (1)

(57) [Claims] 1. An image bearing memberElectrostaticLatent image formation to form a latent image
Means,Said By latent image forming meansSaidFormed on image carrierIsWasStillness
ElectricWhen a developer is supplied to a latent image to form a developer image,simultaneous
And remains on the image carrier.ResidualRemove developer
Developing cleaning means;By the developing cleaning means Development formed on the image carrier
Transfer image of agentUpTransfer toDoTransfer means, Remains on the image carrier after transfer by the transfer means
Disturbing means for disturbing the residual developer; ,Downstream of the transfer means along the rotation direction of the image carrier
And abuts the image carrier upstream of the disturbing means.
And is adapted to the size of the member to be transferred.
The image bearing member facing the image forming area of the member to be transferred.
Placed outside the facing area of the holding body, The transfer meansby
Attaches to the image carrier with the transfer operationSaidTransferred part
LumberofCrushed powder removing means for removing crushed powderHavingFeatures
Image forming apparatus.