JPH04133087A - Transfer device - Google Patents

Abstract

PURPOSE:To simplify removing and discarding discharged toner by providing a housing means which houses a dielectric belt for transfer and a driving means for the belt and is provided with an aperture part on the transfer surface side of a recording medium and separately arranging the discharged toner recovery part. CONSTITUTION:The dielectric belt 11 for transfer is laid and driven by a bias roller 27 for transfer, a belt driving roller 7 and a driving roller 9. A transfer paper P is fed by a resist roller 1 at specified timing. Furthermore, the aperture part 4b is formed on the transfer pat side of a transfer carrying unit 4 and a cleaning means 36 is disposed there. The surface of the transfer belt 11 and the surface of the resist roller 1 are cleaned by the means 36, and discharged toner and paper powder which are removed are collected in a discharged toner bottle 39. Since the recovery part of the discharged toner of the means 36 is arranged separately from the housing member, the removing and discarding work of the discharged tone is simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a transfer device such as a facsimile and a printer that uses a dielectric belt as a transfer means.

(Prior Art) Conventionally, image information (toner image) of a document held on an image information carrier (hereinafter referred to as photoreceptor) is transferred onto a recording medium made of plain paper (hereinafter referred to as transfer paper). . The applicant proposed a device that uses a dielectric belt made of a semiconductor material with an electrical resistance of 10&~1013 Ω-1 as a transfer device of an image forming apparatus using the so-called Carlson process, and this device is already publicly known (Patent No. Kaisho 53-9683
Publication No. 8).

An image forming apparatus using this dielectric belt as a transfer device uses a transfer charger consisting of a corotron that uses corona discharge as a means to transfer the toner image held on the photoreceptor, and transfers the toner image. A separation charger that removes the electrostatic attraction force of the transfer paper is used as a means for peeling the transferred transfer paper from the photoreceptor, and a suction conveyance belt is used as a means for transporting the transfer paper separated from the photoreceptor. It is possible to eliminate the following drawbacks of conventional general image forming apparatuses.

In other words, in the conventional general image forming apparatus described above, the transfer paper needs to have an electric charge in order to transfer the toner image on the photoreceptor onto the transfer paper, and on the other hand, it is necessary to separate the transfer paper from the photoreceptor. In order to do this, it is necessary that the transfer paper be sufficiently neutralized.

Moreover, in the conventional general image forming apparatus described above, these contradictory actions need to be performed in extremely close locations.

For this reason, if the voltage applied to the transfer charger is increased to increase the amount of charge applied to the transfer paper, the transfer of the toner image to the transfer paper becomes reliable, but the charge removal from the transfer paper by the separation charger is insufficient. As a result, there is a risk that the transfer paper will not be separated from the photoreceptor and will remain stuck there.

On the other hand, in order to prevent such separation defects, contrary to the above, if the action of the separation charger is strengthened, the static elimination action of this separation charger will extend to the charging range of the transfer charger, so that the transfer by this transfer charger will not be possible. The transfer effect of the toner image onto the paper becomes insufficient, and the toner image is easily transferred.

As is clear here, in order to achieve good transfer of the toner image onto the transfer paper and reliable separation of the transfer paper from the photoreceptor, the strength of the action of the transfer charger and the separation charger must be individually stable. It is necessary to make adjustments to achieve this, but their stable region is narrow and the adjustment process is extremely difficult.

Furthermore, in the above-mentioned conventional general image forming apparatus, the transfer paper itself holds the charge necessary to transfer the toner image on the photoreceptor, and the transfer paper is brought into direct contact with the photoreceptor. .

For this reason, as described above, if the charging charger and the neutralization charger are arranged close to each other, the transfer paper becomes an electrical resistor that connects the transfer charger as a charge supply source and the separation charger as a charge absorption source. The amount of charge held by the transfer paper changes depending on the electrical resistance value of the transfer paper.

Therefore, in order for the transfer paper to have the charge necessary for transferring the toner image, it is necessary to adjust the amount of charge applied by the transfer charger each time according to the magnitude of the electrical resistance of the transfer paper.

However, as is well known, there are many types of transfer paper used in this type of image forming apparatus, and their electrical resistance values vary depending on the type, and even if the type is constant, , the electrical resistance value changes greatly depending on the environment in which it is placed, especially humidity conditions, etc., so as mentioned above, depending on the electrical resistance of the transfer paper,
It becomes virtually impossible to adjust the amount of charge applied by the transfer charger each time.

Therefore, in this type of image forming apparatus, it is extremely difficult to ensure satisfactory toner image transfer on all types of transfer paper under all environments.

Further, in order to transfer a toner image onto a transfer paper, it is necessary to apply an electric charge so that the surface potential of the transfer paper is usually 2 KV or more.

For this reason, in the above-mentioned conventional image forming apparatus, when the transfer paper having a high potential as mentioned above comes into direct contact with the photoreceptor, dielectric breakdown occurs in the photosensitive layer of the photoreceptor, which shortens the life of the photoreceptor. There is.

Further, although the separation charger in this type of image forming apparatus can remove the electric charge held by the transfer paper, it cannot actively separate the transfer paper from the photoreceptor.

Therefore, in this type of image forming apparatus, the peeling action of the transfer paper from the photoreceptor is performed by the rigidity of the transfer paper.
When the rigidity of the transfer paper is low or when the rotational speed of the photoreceptor is too fast, one-separation defects and paper jams tend to occur, resulting in problems that reduce the productivity of the apparatus.

Furthermore, in this type of image forming apparatus, the transfer paper separated from the photoreceptor is conveyed by suction, so it is difficult to transfer paper that is relatively small in size and has a small suction area, curled transfer paper, etc. When the conveyance force is not obtained, the transfer paper often becomes jammed between the photoreceptor and the fixing device.

On the other hand, in an image forming apparatus using a dielectric belt as a transfer device, for example, as described in Japanese Patent Laid-Open No. 63-83762, by applying an electric charge to the dielectric belt, the transfer paper is Without applying a direct charge, the transfer paper is attracted to the dielectric belt by the polarized charges caused by electrostatic induction on the transfer paper and the electrostatic attraction of the charges on the dielectric belt, so that the toner image on the photoreceptor is The force for transferring is generated by the charge applied to the dielectric belt.

Therefore, according to this image forming apparatus, the separation of the transfer paper from the photoreceptor, the transfer of the toner image onto the transfer paper, and the fixing device can be performed without being affected by the type of transfer paper or differences in environmental conditions. Transfer paper can be stably and quickly transported to the printer without deteriorating the photoreceptor or causing paper jams.

(Problems to be Solved by the Invention) By the way, in the conventional image forming apparatus using a dielectric belt as a transfer device, as described in the above-mentioned Japanese Patent Laid-Open No. 63-83762, in the transfer process, There is a risk that waste toner that has not been transferred to the transfer paper and scattered, and paper dust from the transfer paper may adhere to the dielectric belt, making it impossible to perform smooth transfer.

Therefore, in this type of image forming apparatus, it is necessary to provide a cleaning means around the dielectric belt for cleaning waste toner and paper dust adhering to the dielectric belt.

The cleaning means may be arranged, for example, within a housing member that houses a dielectric belt and a belt driving means for driving the dielectric belt, and integrally with this housing member. is possible.

However, when the cleaning means is disposed within the storage member as described above, it is necessary to attach and detach the storage member from the main body of the apparatus each time when removing waste toner, and the cleaning means collects the waste toner. There is a problem that cleaning and disposing of waste toner takes time and effort.

The present invention has been made in view of the above points, and an object of the present invention is to clean and dispose of waste toner by arranging the waste toner collection section of the cleaning means separately from the storage member. An object of the present invention is to provide an image forming apparatus that can simplify operations.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides the image information carrier on a recording medium that is conveyed at a predetermined timing toward the image information carrier by a resist means. In a transfer device for transferring image information held on a body, the transfer device includes a dielectric belt, a drive means for driving the dielectric belt, and a transfer device that accommodates the dielectric belt and the drive means and transfers the image information to the recording medium. and a housing means having an opening formed on the transfer surface side of the recording medium.

(Function) According to the present invention, the opening formed on the transfer surface side of the storage means is used as an arrangement part of the cleaning means for the dielectric belt.

(Example) Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

However, in order to avoid complicating the explanation, illustrations and disclosures thereof will be omitted to avoid complicating the explanation, as well as the configuration and operation within the range that can be clearly recalled from the description of this specification, as well as the above-mentioned and other objects and novel features of the present invention. , or simplify it.

The transfer device of the image forming apparatus according to the present invention is entirely unitized by a transfer conveyance unit 4 as shown in FIG.

In FIG. 1, the transfer conveyance unit 4 is an image forming device (not shown)! An opening is provided on the transfer surface side (upper side in FIG. 1) of the transfer conveyance unit 4, which is detachably supported by a unit support member 15 of the apparatus main body (for example, a copying machine). 4a is formed.

At the transfer position of this opening 4a (upper right in FIG. 1), a photoreceptor 12 which is configured to be rotatable as is well known is arranged.

Also, the upstream side of the transfer conveyance unit 4 (right side in FIG. 11)
A registration roller 1 for feeding the transfer paper P toward the transfer position of the opening 4a is arranged.

On the other hand, on the downstream side (left side in FIG. 1) of the transfer feeding unit 4, a toner image transferred from the photoreceptor 12 is fixed to the transfer paper P discharged from the paper discharge position of the opening 4a. A fixing device 16 is arranged.

As is well known, the transfer paper P is moved by the registration roller 1 at a predetermined timing in synchronization with the rotation of the photoreceptor 12.
The photoconductor 12 is fed to a transfer position between the photoreceptor 12 and the transfer conveyance unit 4 .

The toner image formed on the photoreceptor 12 is transferred to the transfer paper P fed to this transfer position by a well-known image forming process.

The transfer paper P on which the toner image has been transferred is transferred to a transfer conveyance unit 4 by a transfer belt 1 made of a dielectric belt, which will be described later.
The paper is ejected from the paper ejection position downstream of the opening 4a, and the toner image transferred from the photoreceptor 12 is fixed by the fixing device 16.

On the other hand, as shown in FIG.
The belt drive roller 9, tension roller 10, pre-transfer roller 17, transfer charger 6, backup roller 7, etc. are each formed into a unit and integrally supported.

As shown in FIG. 1, the transfer belt 11 is connected to a belt drive roller 9. The tension roller 1o, the pre-transfer roller 17, and the backup roller 7 apply appropriate tension to the tension roller so that it can rotate freely in the direction of the arrow (counterclockwise in FIG. 1).

The belt drive roller 9 is grounded and disposed on the paper discharge position side of the transfer paper P, and both ends of its support shaft 9a, which protrudes through both sides of the transfer conveyance unit 4, are connected to the main body of the apparatus. Each is supported by a unit support member 15.

As a result, the entire transfer conveyance unit 4 is configured to rotate about the support shaft 9a of the belt drive roller 9 so as to be able to move toward and away from the photoreceptor 2.

The transfer conveyance unit 4 is configured in this way.

As described above, the entire belt drive roller 9 is configured to rotate about the support shaft 9a so as to be able to move toward and away from the photoreceptor 12.

The movement of the transfer conveyance unit 4 toward and away from the photoreceptor 12 is performed by a unit push-up lever 2.

As shown in FIG. 1, the unit push-up lever 2 is swingably disposed around a support shaft 2a horizontally suspended below the transfer conveyance unit 4. As shown in FIG.

This swinging of the unit push-up lever 2 is performed by turning on and off a push-up lever solenoid 3 disposed to engage with the base end of the unit push-up lever 2.

That is, in FIG. 1, when the push-up lever solenoid 3 is off, the unit push-up lever 2 swings clockwise due to the weight of the transfer conveyance unit 4, and the transfer conveyance unit 4 moves clockwise around the support shaft 9a. The transfer belt 11 of the transfer conveyance unit 4 is rotated so that the transfer belt 11 of the transfer conveyance unit 4
separated from 2.

On the other hand, in FIG. 1, when the push-up lever solenoid 3 is on, the unit push-up lever 2 swings counterclockwise against the weight of the transfer conveyance unit 4, and the transfer conveyance unit 4 is rotated about the support shaft 9a. As a result, the transfer belt 11 of the transfer conveyance unit 4 comes into contact with the photoreceptor 12.

The positional accuracy of the transfer belt 11 when the transfer belt 11 and the photoreceptor 12 come into contact is determined by the protrusions formed on both sides near the transfer position due to the rotation of the transfer conveyance unit 4 in the counterclockwise direction. 20 are secured by abutting and engaging flanges 12a formed at both ends (non-image area portions) of the photoreceptor 12.

Further, as described above, the transfer conveyance unit 4 is supported by the unit support member 15 of the apparatus main body so as to be detachable from the apparatus main body.

That is, in this transfer unit 4, when the push-up lever solenoid 3 is turned off and the transfer belt 11 is separated from the photoreceptor 12, the bottoms of the paper feed side and the paper ejection side are aligned in the axial direction of the photoreceptor 12. The guide rails 14 are configured to be placed on a pair of guide rails 14 formed on the apparatus main body side so as to be substantially parallel to the guide rails 14.

Thereby, the transfer conveyance unit 4 can be pulled out from the main body of the apparatus along the guide rail 14 in the direction of the arrow in FIG. 2 with the transfer belt 11 separated from the photoreceptor 12.

Therefore, in this image forming apparatus, by pulling out the transfer conveyance unit 4 from the main body of the apparatus as described above, it is extremely easy to remove the transfer paper when a jam occurs and to replace and maintain the transfer conveyance unit itself. I can do it.

Note that flanges 12a formed at both ends of the photoreceptor 12
The outer diameter of the photoreceptor 12 is formed to be slightly smaller than the outer diameter of the image forming area of the photoreceptor 12 .

Therefore, as shown in FIG. 1, when the push-up lever solenoid 3 is turned on and the transfer belt 11 is in contact with the photoreceptor 12, the transfer conveyance unit 4
When the convex portions 20 formed on both sides of the flange 12a come into contact with the flange 12a.

Since the convex portions 20 are engaged with both ends of the photoreceptor 12, the transfer conveyance unit 4 is prevented from separating from the photoreceptor 12.

On the other hand, the fixing entrance guide plate 19 disposed at the paper discharge position of the transfer conveyance unit 4 is disposed extremely close to the transfer belt 11.

In this way, the fixing entrance guide plate 19 and the transfer belt 11
By making the gap between the transfer belt 1 and
The transfer paper P is prevented from being caught in the transfer belt 11 when the transfer paper P is separated from the transfer belt 11.

On the other hand, the casing 6a of the transfer charger 6 is grounded, and by being integrated with the transfer conveyance unit 4, it also serves as a reinforcing stay for the transfer conveyance unit 4.

Further, the charge wire 6b of the transfer charger 6 is detachably connected to a terminal of a power source (not shown) provided in the main body of the apparatus on the back side of the transfer belt 11, so that the charge wire 6b is connected to the charge wire 6b from this power source. A predetermined power is supplied.

Here, the driving means for the transfer belt 11 may be configured to drive the pre-transfer roller 17.

By the way, as described above, when the cleaning means is disposed in the transfer conveyance unit 4, it is necessary to attach and detach the accommodation member from the main body of the apparatus each time when removing waste toner. There is a problem in that cleaning and disposing of collected waste toner takes time and effort.

Furthermore, if this cleaning means is provided independently, there is a problem that the apparatus becomes more complicated.

Furthermore, in this type of apparatus, if paper dust adheres to the photoreceptor 12, cleaning of the photoreceptor 12 is likely to occur improperly, resulting in image deterioration.

The adhesion of this paper dust to the photoreceptor 12 is mainly due to the scattering of the paper dust adhering to the registration roller 1 that conveys the transfer paper toward the photoreceptor 12.

Therefore, as shown in the embodiment of FIG. 1, the present invention utilizes the opening 4b formed on the transfer section side of the transfer conveyance unit 4 to position the pre-transfer roller 17 of the transfer conveyance unit 4 on the outer side. A cleaning means 36 is provided.

The cleaning means 36 includes a cleaning brush 37 for cleaning the surface of the transfer belt 11, a cleaning bias roller 1b to which a cleaning voltage is applied,
It is comprised of a cleaning blade 38 disposed in contact with the cleaning bias roller 1b, a waste toner bottle 39 for collecting waste toner and paper dust removed by the cleaning blade 38, and the like.

Here, the waste toner bottle 39 is configured to be detachable from the main body of the apparatus.

Further, the cleaning bias roller 1b also serves as a lower roller of the registration roller 1, and is configured to align the transfer paper P with the toner image formed on the photoreceptor 12.
It is driven at a predetermined timing.

Further, the upper roller 1a of the registration roller 1 is made of a conductive metal roller and is grounded.

A Zener diode 40 is provided at the ground portion of the roller 1a to prevent leakage of the voltage applied from the cleaning bias roller 1b.

As described above, according to this embodiment, the waste toner bottle 39 of the cleaning means 36 for the transfer belt 11 is configured separately from the transfer conveyance unit 4, and is detachably attached to the main body of the apparatus. Because of this arrangement, waste toner and paper dust removed by the cleaning blade 38 can be easily cleaned and disposed of.

Furthermore, in this embodiment, the cleaning bias roller 1b of the cleaning means 36 also serves as the lower roller of the registration roller 1, so that the cleaning means 36 can be simplified and downsized.

Furthermore, in this embodiment, by applying a voltage to the registration roller 1, the paper dust generated from the transfer paper P can be actively electrostatically attracted to the registration roller 1 and collected. It is possible to reduce scattering of paper powder that sometimes adheres to the photoreceptor 12.

Further, in this embodiment, the upper part 18 of the case of the cleaning means 36 is configured to also serve as a guide plate for the transfer paper P in the vicinity of the registration rollers 1, as shown in FIG.

Next, another embodiment of the present invention will be described based on FIG.

In this embodiment, as shown in FIG. 3, the pre-transfer roller 17 and the transfer charger 6 in the embodiment described above are composed of a transfer bias roller 27, and this transfer bias roller 27 and a drive roller 9, transfer belt 11
is being strung up.

Here, the transfer bias roller 27 is configured to receive power by being coupled to the main body of the apparatus.

Furthermore, this embodiment is configured so that the polarity of the voltage applied to the transfer bias roller 27 can be reversed.

Next, the differences in the principle process of the embodiment of the present invention configured as described above will be explained while comparing it with the basic process in a conventional image forming apparatus.

Here, in order to avoid complication, descriptions of well-known processes that are common to conventional basic processes, such as charging, exposure, erasing, development (monochrome or color), and pre-transfer static elimination, will be provided. Omitted.

The principle process of an embodiment of the present invention is shown in FIG. 4, the transfer paper conveyance process in the same embodiment is shown in FIG. 5, and the basic process of a conventional image forming apparatus is shown in FIGS.

In Figure A and Figure '5, the registration roller 1
The transfer paper P, which has been fed until then and has been on standby, is supplied toward the transfer section in synchronization with the rotation of the photoreceptor 12 in time with the rotation of the photoreceptor 12.

When the leading edge of the transfer paper P is supplied to the vicinity of the contact area between the photoreceptor 12 and the transfer belt 11, at the same time, the unit push-up solenoid 3 moves the unit push-up lever 2, transfer charger 6, backup roller 7, etc. Push up the transfer conveyance unit 4 including the above.

As a result, the transfer belt 11 comes into contact with the photoreceptor 12 with a predetermined nip width due to the action of the backup roller 7.

At this time, a predetermined voltage is simultaneously applied to the transfer charger 6, and a negative charge is applied to the transfer belt 11.

Here, the transfer charger 6 is composed of a corona discharger constructed by stretching a thin tungsten wire, and is connected to the photoreceptor 1.
The grounded conductor portion inside 2 serves as a counter electrode.

Further, the transfer belt 11 has an electrical resistance value of 108 to 10.
Semiconductor belt of 1 jΩ・a (same as the present application - by Ro Ganto,
(Already known from Japanese Unexamined Patent Publication No. 53-96838).

Therefore, in the vicinity of the photoreceptor 12 of this transfer belt 11,
A negative charge is charged, the transfer paper P is polarized by this negative charge, and an electrostatic attraction is generated by the true charge on the transfer belt 11 and the polarized charge of the transfer paper P, and the transfer paper P is moved toward the transfer belt 1.
It is adsorbed onto 1.

On the other hand, as shown in FIG. 7, the toner particles on the positively charged photoreceptor 12 can be transferred by considering the transfer belt 11, the transfer paper P, and the gap G as dielectric bodies with different permittivity. The image is transferred onto the transfer paper P by electrostatic attraction due to the negative charge applied by the charger 6.

At this time, the surface potential of the photoreceptor 12 is normal.

Since it is set around 800■, transfer charger 6
The surface potential of the transfer belt 11 increases from 2kV to 3k by applying
If it is set in advance to be V, stable transfer can be achieved.

In this embodiment, in order to make this transfer more reliable, the backup roller 7 brings the transfer belt 11 and the photoreceptor 12 into contact with each other with a sufficient nip width, thereby increasing the transfer efficiency. ing.

The transfer paper P, which has completed the transfer of toner particles as described above, remains attracted to the transfer belt 11 due to electrostatic attraction.
The image is transported toward the fixing section.

Therefore, in the principle process of the present invention, there is no need to separate the transfer paper P using a separation charger or a separation claw in the conventional basic process shown in FIG.

In other words, in the conventional basic process, in the transfer step,
A separate charger (AC
), the transfer paper P is separated by removing the static electricity and eliminating the adhesion force between the photoreceptor 12 and the transfer paper P.

Furthermore, in the conventional basic process, a separation claw is required to ensure separation of the transfer paper P.

In addition, in the principle process of the present invention, the transfer belt 11 has the function of conveying the transfer paper P, so the transfer paper conveyance belt used in the transfer paper conveyance section (not shown) in the conventional basic process, A suction fan for sucking the transfer paper to the transfer paper conveyance belt becomes unnecessary.

By the way, the transfer paper P transferred and conveyed by the principle process of the present invention passes through the transfer belt 11 from the ground roller (the moving roller 9 in the illustrated example) during the conveyance.
The amount of charge is gradually relaxed.

Then, the transfer paper P whose electrostatic attraction has been weakened as described above has a small diameter (for example, φ20) at the entrance of the fixing section.
Due to the curvature separation due to the stiffness of the grounding roller 9 and the transfer paper P, it is separated from the transfer belt 11 and sent to the fixing section.

On the other hand, the rear end of the transfer paper P is connected to the photoreceptor 12 and the transfer belt 11.
At the same time as the transfer unit 4 exits the nip portion, the unit push-up solenoid 3 is turned off, and the transfer conveyance unit 4 separates from the photoreceptor 12.

This prevents deterioration of the photoreceptor 12 due to friction caused by contact between the photoreceptor 12 and the transfer belt 11.

Here, in order to improve the cleaning performance of the transfer belt 11, it is necessary to form the transfer belt 11 from a material with good release properties, or to coat the outer peripheral surface of the transfer belt 11 with a substance that improves release properties. There is.

Therefore, in this embodiment, a transfer belt 1 is coated with fluorine on the surface of a belt made of urethane rubber.
1 is used.

Further, in the fifth embodiment, as described above, the transfer belt 11
Semiconductors are used as materials.

29. If a conductive belt is used for the transfer belt 11, the charge from the transfer charger 6 will escape and the toner will not be transferred to the transfer paper P. Conversely, if an insulating belt is used for the transfer belt 11, the toner will not be transferred to the transfer paper P. , it becomes impossible to gradually relieve the charge on this belt by the ground roller 9,
A static eliminating device such as a static eliminating charger is required.

(Effects of the Invention) According to the present invention, the opening formed on the transfer surface side of the accommodating means can be used as an arrangement part for the cleaning means for the dielectric belt.

By arranging the waste toner collection section of the cleaning means separately from the storage member through this opening, cleaning and disposal of waste toner can be simplified.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view of a transfer conveyance unit in an embodiment of the present invention, FIG. 2 is a schematic perspective view of the above transfer conveyance unit, and FIG. 3 is a schematic sectional view of another transfer conveyance unit in an embodiment of the present invention. , FIG. 4 is an explanatory diagram of the principle process in the embodiment of the present invention, FIG. 5 is an explanatory diagram of the transfer paper conveyance process in the embodiment of the present invention, and FIG. 6 is an explanatory diagram of the basic process in a conventional image forming apparatus. FIG. 7 is an explanatory diagram of the transfer step of the principle process in the embodiment of the present invention. 1...Registration roller, 1a...Registration roller 1
upper roller, 1b... bias roller for cleaning, 4... transfer conveyance unit, 6... transfer charger, 9... drive roller, 11... transfer belt, 1
DESCRIPTION OF SYMBOLS 2... Photoreceptor, 16.degree.Fixing device, 18... Pre-transfer kite plate, fixer logite plate, 36... Cleaning means, 37... Cleaning brush, 38... Cleaning blade, 39・・・Waste toner bottle, 40・
...Zener diode. 41'-,' (1 other person)

Claims (1)

[Claims] 1. In a transfer device that transfers image information held on the image information carrier onto a recording medium that is conveyed at a predetermined timing toward the image information carrier by a registration means. , the transfer device includes a dielectric belt, a drive means for driving the dielectric belt, and a storage means for accommodating the dielectric belt and the drive means and having an opening formed on the transfer surface side of the recording medium. A transfer device comprising: 2. The invention further comprises a cleaning means for removing toner adhering to the surface of the dielectric belt, and the cleaning means cleans the resist means near the image information transfer position. Item 1. Transfer device according to item 1. 3. A bias roller is disposed at a position facing the image information carrier while sandwiching the dielectric belt, and
3. The transfer device according to claim 2, wherein the cleaning means is disposed on the surface of the dielectric belt at a portion stretched over the bias roller. 4. For the bias roller mentioned above, the first
A claim characterized by comprising a charge applying means for applying at least two types of charges: a charge of 1 and a second charge necessary for promoting cleaning of the dielectric belt when image information is not transferred. Item 3. Transfer device according to item 3. 5. The registration roller is composed of a grounded conductive first roller and a second roller that also serves as the bias roller, and the second roller is connected to the grounded portion of the second roller. 2. The transfer device according to claim 1, further comprising charge control means for preventing leakage of the voltage applied to the transfer device. 6. The transfer device according to claim 1, wherein a part of the casing of the cleaning means constitutes a part of a recording medium transport path near the registration roller.