JPH01154074A - Transfer and carrying device - Google Patents

Abstract

PURPOSE:To obtain a transfer image having a good quality without executing a complicated destaticizing operation by placing a transfer material destaticizing means for preventing irregularities in an image at a separating position of a transfer material and a carrying belt. CONSTITUTION:A transfer material 117 is fed in between a belt 111 and a conductive brush 124 being in a grounded state provided so as to be opposed to said belt prior to a transfer position 15. Accordingly, even when a resistance of the transfer material 117 has become high, charge is moved uniformly to the transfer material 117 from the conductive brush 124 being in a grounded state, the transfer material 117 is attracted strongly and stable carrying which is free from a deviation and a sure transfer being free from a transfer drop-out can be executed. Also, by installing a corona discharge device 123 in a separating position of paper and the transfer and carrying belt 111, the transfer material 117 and the transfer and carrying belt 111 can be separated smoothly without causing irregularities in the image and toner contamination to the periphery. In such a way, a transfer image of a good quality being free from irregularities in the image can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a transfer/conveying device that electrostatically supports and conveys a transfer material and performs transfer onto the transfer material by physical or chemical means.

Conventional technology In order to ensure the reliable conveyance of transfer materials in copying machines and printers, a belt is made of an insulating material such as a dielectric material, and means for conveying the transfer material by electrostatically adhering it to the belt material. Some examples are already known.

For example, in US Pat. No. 2,567.882, a conductive member and a dielectric member are bonded together to form a two-layer conveyor belt, and a transfer material is supplied between the conveyor belt and a charging member. For this reason, it can be seen as a method in which the transfer material is charged and then attracted to the belt, rather than the transfer material being attracted to a pre-charged belt.

For this reason, the belt dielectric layer and the transfer material are charged to the same polarity. FIG. 8 shows this embodiment. 81 is a dielectric belt supported and stretched by rollers 82 and 83.

84 is a metal belt supported by rollers 86 and 87. A metal foil 85 faces the metal belt 84 with the dielectric belt 81 in between. The transfer material 88 is charged by the bias applied between the metal belt 84 and the metal foil 85. Reference numeral 89 short-circuits the metal foil 85 and the transfer material 88. 810 is a guide plate that guides the transfer material 88 to the belt 81.

In US Pat. No. 3,357,325, a corona discharger is used for attracting and transferring a transfer material, and a dielectric single-layer belt is used. FIG. 9 shows a schematic diagram of the embodiment. 91
92 is a drum-shaped image support; 92 is a dielectric single-layer belt; 93 is a drum-shaped image support;
．． 94 is a roller for supporting, extending, and rotating the dielectric belt 92. 95 is a roller for guiding the transfer material 96. 97 is a corona discharger for adhering the transfer material 96 to the dielectric belt 92 by electrostatic force, and 98 is a corona discharger for transferring the charged powder image from the image support 91 to the transfer material 96.

Problems to be Solved by the Invention In U.S. Pat. No. 2,576.882, it is possible to perform transfer and conveyance by combining charging devices, but due to its structure, the former U.S. Pat. No. 3,357. 3
Similar to Publication No. 25, when the conveyor belt and the transfer material are charged to the extent that sufficient conveyance force is obtained, static electricity is generated on the transfer material due to a sudden change in the electric field at the position where the transfer material and the conveyor belt are separated. There is a very high possibility that the insulating charged particles being transferred will be disturbed and the transferred image will be adversely affected. For this reason, in a transfer device using a conventional transfer/transport belt, it is essential to perform an operation to eliminate electric charges existing on the belt and the transfer material at a position where the transfer material and the transport belt are separated. However, it is extremely difficult to completely remove all of the electric charge that exists on the conveyor belt and the transfer material, and to do so, a separate corona discharger connected to a special power source is used to remove the electric charge. What must be done is shown in US Pat. No. 3,244.083 and other publications. In addition, as a method of charging the conveyor belt and transfer material,
U.S. Patent No. 3, which uses a special corona discharger and power supply,
Although this method is disclosed in Japanese Patent No. 717.801, etc., it is difficult to say that it is a preferable method in view of economic reasons. Furthermore, in U.S. Pat. No. 2,576,882, if the transfer material is curled, there may be concerns about conveyance performance. Also, U.S. Patent No. 2,576.882 and U.S. Patent No. 3,35
No. 7.325 does not give any consideration to the cleanability of the conveyor belt due to adhesion of charged colored particles, for example. Additionally, U.S. Patent 3,35
In Japanese Patent No. 7,325, charge is accumulated on the dielectric belt each time the transfer/conveyance cycle is repeated, causing a change in the surface potential of the dielectric belt over time, making the transferred image extremely unstable. In view of the above-mentioned problems, the present invention realizes strong conveyance of the transfer material by effectively using the charged charge of the conveyor belt without using any special means for the charging device, and achieves high quality transfer material without going through complicated static elimination operations. An object of the present invention is to provide a transfer/conveyance device that obtains a transferred image.

Means for Solving the Problems In order to solve the above problems, in the present invention, a conveyor belt consisting of at least two layers of a dielectric material and a conductive material, on which a dielectric layer is charged, is placed opposite to the conveyor belt prior to the transfer position. The transfer material is passed between the provided grounded conductive brushes, and a transfer material static eliminating means for preventing image disturbance is arranged at a position where the transfer material and the conveyor belt are separated, and further in front of the cleaning member of the conveyor belt. As a function of improving cleaning performance, a charging means for precharging is installed.

Operation The present invention has the above-mentioned structure. First, when the transfer material conveying belt is charged, a charge having a polarity opposite to that accumulated on the surface of the dielectric material is transferred to the transfer material from a conductive brush placed oppositely near the dielectric material. By transferring this to the charge on the dielectric surface, strong electrostatic adhesion between the transfer material and the conveyor belt is realized, and the transfer material is stably conveyed without shifting during transfer. It is something.

Furthermore, since the transfer material is pressed against the belt and brought into close contact with the belt by electrostatic force, curling of the transfer material does not pose a major problem. In addition, the surface potential of the belt is extremely high because the cycle of charging and removing static electricity is repeated for each rotation of the transfer/conveyance belt due to the grounded conductive brush installed opposite to the charged belt dielectric layer. It has stability. Therefore, the transferred image remains stable.

On the other hand, since the transfer material is charged with a polarity opposite to that of the transfer/conveyance belt, it is necessary to remove the charge from the transfer material at a position where the belt and the transfer material are separated.

For this purpose, corona discharge with the same polarity as the transfer/conveyance belt may be applied to the transfer material at a separation position between the transfer material and the transfer/conveyance belt with a current of a certain value or more. In particular, by adopting an arrangement in which corona discharge charges are dispersed from the copy surface side of the transfer material to the transfer material before separation, it becomes possible to significantly alleviate changes in the electric field before and after the separation position of the transfer material. It has become possible to obtain high-quality transferred images without image disturbance.

The cleaning performance of the transfer/conveyance belt is greatly affected by the electrostatic action between the toner and the belt.Here, a conductive member that is grounded near the belt cleans the surface of the area where the transfer material does not pass through to the transfer position. The surface potential is considerably lowered due to the neutralizing action.For this reason, the electrostatic adsorption force between the toner and the belt is quite weak.However, before the cleaning position, the electrical situation between the toner and the belt is significantly lowered. The cleaning performance was significantly improved by changing the toner and providing a charging means to make the toner and the belt the same polarity so that the toner can be more easily moved from the belt.

Embodiment Hereinafter, a transfer/conveyance device which is an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a cross section of a transfer/conveyance device in an embodiment of the present invention. In FIG. 1, reference numeral 11 denotes a rotatable drum-shaped image holding member (hereinafter simply referred to as a drum), in which a photosensitive dielectric layer such as selenium is coated on a drum-shaped conductor support such as aluminum. It was established. Usually this conductor support is grounded. First, this drum 11 is a corona discharger 1
2, the drum 11 is uniformly charged, and at the next exposure portion 13, light corresponding to the original is imaged on the drum 11 through means (not shown), such as a lens. At this time, the electric charge on the part of the drum surface exposed to light, which is charged in a negative manner, is neutralized with the opposite polarity electric charge induced in the conductor support on the back side of the photosensitive layer, and disappears. A pattern of charges corresponding to brightness or darkness, that is, a latent image, is formed. This latent image is made visible in the subsequent developing section 14 by adhering fine insulative charged particles (hereinafter referred to as toner) by electrostatic force.

The toner image thus obtained on the drum 1 is transferred to the transfer position 1.
5, the toner image is electrostatically transferred onto a transfer material 117 (hereinafter referred to as paper) that is conveyed in synchronization with the toner image, and the remaining toner on the drum 11 is removed by a cleaning unit 16 using a blade, etc. By means of.

After the drum 11 is wiped off, the drum 11 is irradiated with --like static eliminating light in the static eliminating section 17 to eliminate static electricity from the drum 11, and is prepared for the next process.

Here, part A is a transfer/conveyance device for paper, etc. according to the present invention. The belt 111 is composed of two layers: a dielectric layer 112 on the outside and a conductor layer 113 on the inside. In this example, the thickness is 90
A sheet with a two-layer structure in which aluminum was vapor-deposited on one side of a μm polyester film was cut out to a predetermined size, and the ends were welded using ultrasonic waves.

Of course, the outside can be made of dielectric material such as nylon or Teflon, and the required electrical resistance is 1013Ω・(
2) or more, preferably 10'4 Ω·1 or more.

Its thickness is less than 200μm, preferably 10-100μm
A range of m is desirable. As long as the inner layer is a conductor, it is desirable that its electrical resistance is less than lOhΩ·value, regardless of its material. The thickness of the conductor layer may be arbitrarily determined depending on the mechanical strength required of the belt together with the dielectric layer. Furthermore, a belt can be formed as a single sheet by gluing sheets of dielectric and conductor together, or a dielectric layer can be formed by coating, gluing, dipping, etc. on a seamless endless conductive belt. Alternatively, there is no problem in practical use even if a belt having a two-layer structure of a dielectric layer and a conductor layer is simultaneously molded by injection molding the conductor member and the dielectric member. Further, even if an adhesive layer was present between the dielectric layer and the conductive layer, there was no functional problem.

The belt 111 is supported by rollers 114 and 115 and stretched by means (not shown) of tension such as springs. The surface of the roller 115 is made of a conductor,
The four body layers 113 inside the roller 111 are the rollers 1
It is grounded through 15. An appropriate bias may be applied depending on the situation.

The belt 111 is rotated by the roller 11 by a rotating means (not shown).
By driving the drum 5, the transfer section 15 is rotated in the same direction as the drum 11 and at the same circumferential speed. The surface of the dielectric portion 112 on the outside of the conveyor belt is charged with a polarity opposite to that of the toner by a charging corona discharger 116.

This is because, for example, if the toner is negatively charged, the dielectric portion of the belt 111 is positively charged, and the toner on the surface of the drum 11 is electrostatically transferred to the belt 111 side by an electric field based on this positive charge. be. , of course, instead of the corona discharger 116, the dielectric layer 11 of the bell) 111 is connected by a conductive brush or the like to which a contact bias is applied.
There is no practical problem in applying a charge to the surface of 2.

Here, the cylindrical member 117 is sent between the roller 114 and the grounded conductive brush 124 in synchronization with the drum 11. In this embodiment, the roller 118 is
7 is a transfer/conveyance belt) 111, which is intended to be brought into close contact with the surface of the transfer/conveyance belt 111 without lifting, is electrostatically insulative, and is pressed against the transfer/conveyance belt by a means (not shown). Therefore, even if the paper 117 is curled, the paper 11 is attached to the belt 111.
7 can be pressed. Reference numeral 124 denotes a brush made of conductive fibers and has an electrical resistance of about 10 hΩ from the member surface to the grounding position.

In FIG. 1, at the contact portion between the charged belt dielectric layer 112 and the conductive brush 124, the spatial distance between the charged belt dielectric surface and the electrostatically grounded conductive brush narrows, so the electric field at this portion is reduced. The strength becomes very strong.

Therefore, the potential difference between the belt dielectric layer and the conductive brush is 70
When the voltage is larger than about 0 V, a discharge phenomenon occurs due to dielectric breakdown of the air.

The principle of paper conveyance according to this method actively utilizes this discharge phenomenon. The electrostatic suction action between the paper and the paper conveyance/transfer belt will be explained below based on the drawings. FIG. 2 shows a discharge situation when, for example, a belt dielectric layer is positively charged and a conductive electrostatically grounded member is closely opposed to the belt dielectric layer. In this figure, the grounded conductive member has a needle-like shape and is in contact with the belt dielectric layer. However, in order to generate a discharge phenomenon, this conductive member does not necessarily have to have a needle-like shape, and in fact, even if the conductive member is a flat member, there is no difference in the discharge effect under normal circumstances. In addition, in order to generate a discharge, it is not necessary that the grounded conductive member and the charged belt dielectric layer are in contact with each other; this means that the potential on the surface of the belt dielectric layer is It is sufficient that the discharge starting voltage is equal to or higher than the discharge starting voltage determined by the spacing between the layers. This discharge starting voltage can be easily determined from the Pacshen air breakdown voltage curve.

In Fig. 2, when the charged belt dielectric surface approaches the grounded conductive brush, discharge starts at a point exceeding the discharge breakdown voltage described by the Pacshen curve, and as in this example, the conductive member When in contact with body layers, the final result is a direct charge transfer. FIG. 3 explains this discharge phenomenon using an equivalent circuit. Since the belt dielectric layer is made of a material with a very high volume resistivity (10”Ω on the mouth side), the belt dielectric layer 112
The capacitance between the belt conductor layer 113 and the belt conductor layer 113 can be considered to be an ideal capacitance. Let this be 01. On the other hand, since charge movement, that is, current flows between the belt dielectric layer 112 and the grounded conductive brush 124, the charged capacitor 1c is discharged in the discharge region via the resistor R9. Become.

Next, consider the case where paper enters the discharge region between the belt dielectric layer 112 and the conductive brush 124. FIG. 4 schematically shows this state. - If an object with high electrical resistance is placed in the area where air discharge is occurring on the construction surface, the discharge will stop. This can be considered to be because the electric field strength in the discharge region is weakened by the polarization effect, and also because the electrical resistance of the object becomes an obstacle to the movement of charges. The paper plunge reduces air breakdown. However, paper can basically be considered a conductor from an electrostatic point of view.

Therefore, the shield 117 sandwiched between the belt dielectric layer 112 and the conductive brush 124 receives the negative charges induced in the conductive brush 124 by the charges on the belt dielectric surface. It is therefore possible to negatively charge the paper by passing it between a substantially positively charged belt dielectric layer and a grounded conductive member. It is clear from the above reasons that if the belt dielectric layer has a negative charge polarity, contrary to this example, the paper has a positive charge polarity. The degree to which the paper is charged is important when evaluating paper transportability, and this can be understood by considering an equivalent circuit as shown in FIG. The reason why the charges are not neutralized between the paper 117, which is a conductor, and the belt dielectric layer 112 is because there is a thin layer of air between them. Since the charged shields 117 face each other with an air gap in between, they can be placed with one capacitance.

Let this capacity be 02. Furthermore, since the electrical resistance of the paper is also added to the movement of charges, the discharge resistance becomes larger than the discharge resistance R3 in FIG. 3. This is represented by R2. This fifth
According to the equivalent circuit in the figure, the smaller the electrical resistance of the paper, the larger the current flowing through the circuit should be.In fact, when paper with high moisture content is passed through, the current flowing through the conductive brush 124 is large, which is reasonable according to this model. I support sexuality.

No matter how low the electrical resistance of the paper is, a sufficient current will not flow to completely cancel out the charges on the charged belt dielectric layer 112. This means that even in the state shown in Figure 2, the surface potential of the belt dielectric layer does not reach zero potential even after passing through the discharge region.
It shows a potential of 00 to 600. Therefore, even if the paper is negatively charged, surplus positive charges still exist in the belt dielectric layer. Even in the equivalent circuit shown in FIG. 5, it is clear that only the negative charge that can be divided by the capacitance of C and C2 can flow into the paper. For this reason, the paper is negatively charged and the electrostatic force between the paper and the positive charge of the belt dielectric layer realizes strong attraction, thereby making it possible to electrostatically transfer the toner image.

However, when the moisture content of paper is significantly reduced, the surface resistance of the paper becomes extremely large, and the electric charge on the paper surface becomes difficult to move. If such paper is non-uniformly charged by air discharge, the charges will not be uniformly distributed during the paper being fed to the transfer position, resulting in uneven distribution of charges within the paper. The transfer ability is lower in areas with less negative charge, and conversely, the transfer ability is higher in areas with more negative charge. For this reason, when solid black is transferred, a distribution of air discharge charges and a pattern called a Lichtenberg pattern are caused to be missing in the transfer. Particularly in the case of discharge from a planar conductive member, the occurrence of such a Lichtenberg pattern is remarkable. For this reason, it is necessary that charges flow uniformly into the paper. Brush made of conductive fiber (pile length 5, electrical resistance approximately 106Ω'Q11, density 100K)
When the brush was brought into contact with the paper using a paper (F/in, fiber thickness: 6 denier) to transfer negative charges, no Lichtenberg pattern was generated and solid black was faithfully transferred. For example, the electrical resistance of paper is 1014 to 101 sΩ・c as a volume resistivity.
When the temperature exceeds In, transfer of negative charge from the planar conductive member to the paper causes the above-mentioned Lichtenberg figure to be missing in the transfer, resulting in a significant decrease in transfer efficiency. In the example shown in FIG. 1 in which a brush was used, no transfer omission of the Lichtenberg pattern occurred and no decrease in transfer efficiency occurred even on paper having the above-mentioned resistance value.

The electrostatically transferred toner image is restrained by a positive charge in excess of the paper charge present in the belt dielectric layer. The unevenness in charging between the image area and the non-image area is adjusted by the negative charges induced in the belt conductor layer. For example, in areas of paper with a lot of negative charges, the negative charges induced in the belt dielectric layer decrease, increasing the number of lines of electric force from the belt dielectric layer toward the paper, and increasing the overall line of electric force. This is to maintain the balance. This is the reason why a belt with a two-layer structure is used, and it is possible to obtain a high quality transferred image. After transcription, G117 and Bell l-11
Due to the suction force of 1 and the rigidity of the paper 117 itself, the paper 117 is separated from the drum without the need for any special equipment, and the bell! -111, the transfer ends. This is because in the case of reversal development, no electrostatic attraction force is generated between the negatively charged paper and the negatively charged drum, and the problem of poor separation between the paper and the drum, which has been a problem in the past, is completely eliminated. On the other hand, when developing negative toner on a normal positively charged drum, the contact between the paper and the drum can be achieved by charging the belt 111 so that the positive charges on the belt are greater than the positive charges on the drum. it is obvious.

Thereafter, the belt 111 and the belt 117 are separated by the curvature of the roller 115 and the rigidity of the belt 117 itself, and the belt is passed to the fixing guide 119, passed through the fixing device 120, and conveyed to a paper output tray (not shown) to be copied. Complete.

U.S. Patent No. 3,717.801 has Gio 117 and Belt 11.
The problem of image disturbance caused by toner scattering backwards in the direction of movement when the toner is separated has been discussed.

As a countermeasure to this problem, US Pat. No. 3,717,801 uses a special method of charging. Furthermore, several methods have been proposed in which electricity is removed from the paper and the dielectric at a position where the paper and the belt are separated.

In this method, static electricity removal from the paper 117 when the paper 117 and the transfer/transport belt 111 are separated can be considered as follows. First, the positive charges on the surface of the belt dielectric layer, the negative charges on the paper, and the negative charges on the toner form one electrostatic capacitance. Here, the value of this electrostatic capacitance C2 becomes smaller as the transfer/transport belt 117 is separated from the capacitance C2. For this reason, when the paper holding a constant charge separates from the transfer/conveyance belt, the G117
The potential becomes higher as the distance from the belt 111 increases. FIG. 6 schematically shows this situation using an equivalent circuit. paper 1
When the surface resistance R1 of 17 is small, the potential difference between X and Y caused by the change in capacitance causes charges to flow from X to the X direction, thereby canceling out the potential difference between X and Y. However, if the resistor R1 is large, the electric charge cannot flow from the X direction to the X direction, which increases the potential at the X point. Therefore, a potential difference is generated between X and Y, and an electrostatic force is exerted on the toner. This causes images to become distorted on paper with high electrical resistance. Such a phenomenon becomes noticeable when the surface resistivity as an electrical resistance shows a value of 10 to 10'5 Ω/or higher.

For this reason, if a corona discharger is installed at the separation position between the paper 117 and the belt 111 and the negative charge in the paper can be canceled, X-Y
No potential difference will occur between them.

Here, if the charge polarity of the transfer/transport belt is positive, the charge polarity of the paper is negative. Therefore, the charge required to neutralize the electrical charge on the paper is a positive charge. The corona discharger 122 is a static eliminating corona discharger for canceling the electric charge on the paper.

Since the charger 122 has the same polarity as the corona discharger 116 for charging the transfer/conveyance belt 111, it is possible to integrate the charger 122 with the corona discharger 116 for charging the transfer/conveyance belt 111. The static elimination effect of paper cannot be obtained sufficiently,
It is difficult to reliably prevent image distortion. On the other hand, if the direction of the discharge is set at an angle relative to the transfer/conveyance belt, there will be a large discharge loss, and above all, the surface potential of the transfer/conveyance belt will change greatly between when the paper passes and where the paper does not pass. I will do it. In order to stabilize the charging of the transfer/transport belt 111, it is desirable to separately provide a corona discharger for belt charging and a corona discharger for preventing image disturbance.

Furthermore, a corona discharger 122 is located on the copy side of the paper, and the paper and the transfer/conveyance bell! - If the position is set to dissipate the discharge charge to the part in front of the separation position of 111, the 6th
The power supply is connected to X-Y in the equivalent circuit shown in the figure. Moreover, since the charges are dispersed without contact, the distribution of space charges does not depend on the resistance R3 of the paper, and the surrounding electric field is evened out. By installing the corona discharger in this arrangement, it is possible to prevent image disturbances with a discharge current of 10 μA for a paper moving speed of 12 On/sec, and even when a discharge current of 500 μA is applied, there is no difference in preventing image disturbances. This method was found to have a very wide tolerance for disturbances in transferred images. In addition, this corona discharger 122 reduces the amount of toner that scatters when an image is disturbed, and at the separation position,
Since the paper is easily separated from the transfer/transport belt, the mechanical impact caused by the collision with the fixing guide 119 is alleviated, and toner stains near the entrance of the fixing device are significantly reduced.

Further, the charger 123 is a charger for precharging the cleaning member in front of the cleaning member as a cleaning auxiliary means. FIG. 7 shows an example of the effect of electrostatically cleaning one-component toner using a conductive fur brush with a bias applied to the cleaning member. The ○ mark indicates a good cleaning effect, and the x mark indicates an area where the cleaning performance is insufficient. The polarity of the corona discharger 123 may be either positive or negative as long as the cleaning effect is in a sufficient range. However, the potential setting for good cleaning performance may deviate from the example shown in FIG. 7 depending on the capacitance of the transfer/transport belt and the electrical properties of the one-component toner.

The effect of this precharging is to prepare the toner electrostatically attached to the transfer/conveyance belt so that it can be easily removed, and a similar effect can be expected even when an elastic blade is used as the cleaning member.

In the embodiment shown in FIG. 1, the paper 117 is configured to pass above the drum 11, but it is also possible to adopt a structure in which the paper 117 is passed to the side or below the drum 11. Further, in FIG. 1, the conductor portion of the belt 111 is maintained in a grounded state, but an appropriate bias may be applied to it.

Further, in this embodiment, an electrophotographic copying apparatus is taken as an example, but the conveyance method according to the present invention can also be applied to a transfer/conveyance apparatus used in combination with other transfer methods, such as a transfer method that performs thermal transfer. It is possible.

Effects of the Invention As described above, the present invention provides a belt consisting of two layers: a dielectric material such as paper that is electrically charged and a conductive material that is grounded or in a biased state, and a belt that is provided to face the belt prior to the transfer position. By feeding the transfer material between the grounded conductive brush and the grounded conductive brush, even if the resistance of the transfer material becomes high, the charge is uniformly transferred from the grounded conductive brush to the transfer material. Strong adsorption ensures stable conveyance with no slippage and reliable transfer without missing transfer, reduces toner contamination on the transfer/conveyance belt when the transfer material does not pass, and separates the paper from the transfer/conveyance belt. By installing a corona discharger, it has become possible to separate the transfer material from the transfer/transport belt without disturbing the image or toner staining the surrounding area. In addition, by setting the electrostatic force relationship between the toner and the transfer/transport belt in the direction of repulsion before the cleaning member, the toner adhering to the belt could be efficiently cleaned.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of an embodiment of the present invention, FIG. 2 is a schematic diagram for explaining the state of discharge from the transfer material conveying belt of the present invention, and FIG. 3 is a cross-sectional view of the transfer material conveying belt of the present invention. FIG. 4 is a model diagram for explaining the discharge situation, FIG. 4 is a schematic diagram for explaining the transfer material conveyance principle of the present invention, FIG. 5 is a model diagram for explaining the transfer material conveyance principle of the present invention, and FIG. The figure is a model diagram to explain the image disturbance that occurs when the transfer material conveyance belt and the transfer material are separated. Figure 7 shows the change in cleaning performance due to changes in the applied voltage of the conductive fur brush and the output of the precharger. FIG. 8 is an explanatory diagram showing an example of a known transfer material conveying device using static electricity, and FIG. 9 is an explanatory diagram showing an example of a known transfer material conveying device using static electricity. 111... Conveyor belt, 112... Belt dielectric layer, 113... Belt conductor layer, 1
16... Corona discharger for charging the transfer/conveyance belt, 117... Transfer material, 118... Insulating roller, 121... Conductive cleaning fur brush , 122... Corona discharger for preventing image disturbance, 123... Corona discharger for cleaning precharge, 124... Conductive brush. Name of agent: Patent attorney Toshio Nakao, 1 person//--Ichigo Mitsumoto Hondrum //6--Charging tube 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure (+) (0x Heald cleaning, defective 0 Heshib zoning is good

Claims (2)

[Claims] (1) It has means for supporting and stretching an endless transfer material conveying belt, which is composed of at least two layers, the surface in contact with the transfer material being a dielectric and the back surface being a conductor, and rotating in a fixed direction; A means for cleaning the surface of the transfer material conveyance belt, and a transfer material neutralization means at a separation position between the transfer material and the transfer material conveyance belt, and a conductive portion of the transfer material conveyance belt is grounded or an arbitrary bias is applied. means for charging a dielectric portion; a conductive brush in a grounded state that is disposed in front of a transfer position so as to face the dielectric surface of the transfer material conveyance belt; and a means for charging the transfer material conveyance belt. 1. A transfer/conveyance device comprising: means for supplying a transfer material through a transfer material conveyance belt charged with electricity. (2) The scope of the invention is characterized in that a means for bringing the transfer material into close contact with the transfer material conveyance belt is provided immediately before the conductive brush provided prior to the transfer position so as to face the transfer material conveyance belt. The transfer/conveyance device according to item (1).