JPS6383772A - Transfer/conveyance device - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to electronic copying machines, printers, and facsimile machines, and in particular to transfer and
The present invention relates to a conveyance device.

Conventional technology In recent years, transfer and conveyance devices have been used in office automation and other image and character output devices, and are required to be highly reliable.Also, since transfer is a part that directly affects images, high image quality is required. The demands are also high. Furthermore, in response to colorization, it is desired to establish transfer technology and conveyance technology to obtain stable image quality regardless of paper type, physical properties, etc. However, the current transfer/conveyance technology depends on the physical properties of the copy paper, the environment, etc. This is due to the fact that charging or neutralization techniques using static electricity are not fully utilized. It is desired to develop a transfer/conveyance device that utilizes static charge removal technology.

An example of the conventional transfer/conveyance device described above will be described below with reference to the drawings.

FIG. 8 is a front view showing the configuration of a conventional electronic copying machine.

In FIG. 8, 1 is a photoreceptor charger, 2 is a photoreceptor drum whose surface is provided with a photoconductive material, 3 is an exposure device, 4 is a developing device, 5 is a copy paper supply device, 6 is a copy paper, and 7 Reference numeral 1 indicates a transfer charger, 8 a static elimination/separation charger, 9 a belt, 10 a fixing device, and 11 a photoreceptor cleaning device. To explain the operation of this device, the photoreceptor charger 1 uniformly positively charges the surface of the photoreceptor drum 2. After the surface of the photoreceptor drum 2 is uniformly charged by the photoreceptor charger 1, the surface of the photoreceptor drum 2 is exposed to light by an exposure device 3 to form a charge pattern by light. Thereafter, the developing device 4 uses negatively charged toner to transfer the toner onto the surface of the photoreceptor drum according to the charge pattern and visualize it. After the image is visualized, the copy paper 6 supplied from the copy paper supply device 6 is pressed against the photoreceptor drum 2, which is an image carrier, and the transfer charger 8 is positively discharged from behind the copy paper 6. 2. Transfer the toner on the surface to the copy paper e. After the transfer, in order to neutralize the charged copy paper 6 and separate it from the photoreceptor drum 2, a high AC voltage is applied to the charger 8, which causes an AC discharge to eliminate the charge from the copy paper 6, and separates the copy paper from the photoreceptor drum 2. Separate 6. The separated copy paper 6 is conveyed to a fixing device 1o by a belt 9, and the toner is fixed on the copy paper 8 by a fixing device 10. After transfer, the toner remaining on the surface of the photoconductor drum 2 is transferred to a photoconductor cleaning device 11. (For example, Recording Materials and Photosensitive Resins, Japan Society for the Promotion of Science Network P23-32, Electrophotography Society 55th Research Conference Proceedings Pss-87).

Problems to be Solved by the Invention However, in the above configuration, since a transfer charger is applied for transfer, the copy paper is charged and electrostatically attracted to the photoreceptor drum. The copy paper must be neutralized and separated from the photosensitive drum. Therefore, in addition to the power source for the transfer charger, it is necessary to prepare a power source for the static elimination separation charger. Furthermore, in order to ensure transferability and separation of the copy paper from the photoreceptor drum, it is necessary to adjust the discharge efficiency between the transfer charger and the neutralization separation charger to find the point that works best. Moreover, this discharge efficiency is greatly affected by the environment, and readjustment is required in response to environmental changes, resulting in an extremely narrow tolerance range for reliability. Furthermore, what influences transferability is the charge on the copy paper itself, and there are many factors that affect charge, such as the physical properties of the copy paper, storage, and transfer environment, and it is quite difficult to control the charge on the copy paper itself. be. This means that it is difficult to control the neutralization of the copy paper if it is reversed, which affects the separation performance of the copy paper from the drum.

That is, the current transfer/conveyance system has a method and design that depends on copying paper, and therefore has problems such as a decrease in the paper passing performance of the machine and a deterioration in reliability.

In view of the above-mentioned problems, the present invention includes a charged particle transport means for supporting and transporting charged particles, and a semiconductor material that is close to the charged particle transport means and has a specific resistance of 1010 to 11013Q-C, A belt that electrostatically attracts and conveys copy paper by holding an electric charge, a separation shaft made of a conductive material for stretching this belt, one or more rollers, and a separation system. A conveyance means having a shaft disposed on the downstream side where the copy paper is conveyed and stretched between the separating shaft and one or more rollers, and a conveyance means placed within the conveyance means and close to the charged particle conveyance means. , and a corona charger with an opening facing the charged particle transport means, which applies an electric charge to the belt to electrostatically attract the copy paper, and transfers the charged particles from the charged particle transport means to the copy paper. A resistor is connected between the high-voltage input terminal and the high-voltage power output terminal, with the opening thereof facing the vicinity of the central axis of the separation shaft, and the opening thereof facing the vicinity of the central axis of the separation shaft. The belt is equipped with a corona charger that can select and connect resistors with different values by switching terminals, and the belt charged by the transfer means transfers the charged particles to the copy paper, and at the same time, the belt electrostatically attracts the copy paper. The present invention provides a transfer/transport device characterized in that, when the copy paper is separated from the belt, a corona charger applies a charge having the same polarity as the charge held by the belt.

Means for Solving the Problems In order to solve the above-mentioned problems, the transfer/conveying device of the present invention transfers charged particles to the copy paper by the action of something that stably holds electric charge, so that the copy paper itself We have devised a method in which the transfer performance does not depend on the characteristics of the copy paper without charging it. Specifically, the specific resistance is 1010 to 101
A semiconductor belt having a resistance of 3 Ω-m is used, the belt is stretched between at least two axes and placed close to the photosensitive drum, and an electric charge is applied to the belt to electrostatically attract the copy paper to the belt. let In this case, it is the carry belt that holds the charge, not the copy paper. Transfer of the charged particles to the copy paper is performed by charges held on the belt. Further, as long as the belt holds an electric charge, the copy paper is electrostatically attracted to the belt and transported. By using this belt, the transfer performance and conveying force are determined by the holding performance of the belt and are not affected by the characteristics of the copy paper.

Normally, in order to release charged objects that are electrostatically attracted to each other from the electrostatic force, static electricity removal is performed to remove static electricity.

If charged objects are separated from each other without performing this charge removal, the separated objects exhibit a charging phenomenon due to a sudden change from the statically stable charged state. This is called separation charging. The method of charging differs depending on the properties of the substance and the charging situation, but in the case of the present invention, since the copy paper is separated from the stably charged belt, the separation charge is also charged to a charge with the opposite polarity to that of the belt. .

When transferring charged particles to copy paper.

Charged particles had to be attracted by different charges. Considering this, in separate charging, charges with the same polarity as the charged particles are generated, so the charged particles are repelled and scattered. In order to avoid this, the present invention prevents the copy paper from being charged by separation charging at or before the copy paper separates from the belt, or at least prevents the copy paper from being charged with the same polarity as the charged particles. It is.

That is, the transfer/conveyance device is configured to perform this static elimination at the time when the copy paper is separated from the belt or before the copy paper is separated from the belt.

Function The present invention uses the above-described configuration to transfer the toner image on the photoreceptor drum to copy paper. First, the principles of transfer and conveyance will be explained. As shown in the conventional example, image formation on a photoreceptor drum is performed by using a photoreceptor drum having a photoconductive layer on its surface.
The conductive layer supporting the photoconductive layer is grounded, and after the surface of the photoreceptor drum is uniformly charged by a charger, a charge pattern is created on the surface of the photoreceptor by exposure. This is visualized using a developing device. The developing device is a device that charges powder with a diameter of about 10 μm and transfers it to the photoreceptor drum. In this case, when the photoreceptor drum is positively charged, the toner is negatively charged in the developing device. Therefore, electrostatic attraction between positive charges and negative charges occurs, and the latent image becomes visible. In order to transfer the toner image on the photoreceptor drum to copy paper, it is necessary to apply an electric field that overcomes the electrostatic attraction between the photoreceptor drum and the toner described above. In the present invention, this electric field is created by bringing the belt close to the photoreceptor drum and charging the belt.

The belt is made of a semiconductor material having a specific resistance of 10 Ω·ctn to 10 Q−α. Because the belt 9 is semiconducting, it does not show the high charge that occurs with materials with weak self-discharge properties such as dielectric materials, and unlike low-resistance materials, charge leaks quickly and does not charge the belt itself, so it does not charge the copy paper. The toner retains a charge sufficient to form an electric field sufficient to overcome the attraction between the photoreceptor drum and the toner without causing injection and charging. When copy paper is inserted between the belt and the photoreceptor drum, the copy paper is polarized due to the electric charges on the belt and the electric field formed between the photoreceptor drum.

That is, when the belt is positively charged, a negative charge is induced on the belt side of the copying paper, and a positive charge is induced on the photosensitive drum side.

This induced positive charge on the copy paper transfers the negatively charged toner onto the copy paper, and at the same time, the copy paper is electrostatically attracted to the belt. Here, there are two main reasons why the copy paper separates from the drum. First, since the copy paper is attracted to the belt due to its polarization, there is an attraction between the charged charges on the belt and the polarized charges on the copy paper (in this case, an attraction between the positive charges on the belt and the polarized negative charges on the copy paper). , is greater than the attraction between the ground potential surface of the photoreceptor drum (the exposed portion has approximately the same potential as the conductive layer supporting the photoconductive layer) and the polarization charge (in this case, positive charge) of the copy paper.

Second, if the specific resistance of the belt is less than 109Ω-(7), charge will be injected into the copy paper;
When a semiconductor belt of ~10 Q-cm is used, no charge is injected into the copy paper, and there is no repulsion of charge between the copy paper and the belt caused by the injection. Therefore, the attraction between the polarized charges and the belt charges effectively occurs.◎As long as the belt holds the charged charges, the conveyance force of the copy paper is generated by the attraction between the polarized charges of the copy paper. However, since the belt is a semiconductor, charge leakage is slower than that of a conductive material, and the charge leakage speed varies depending on the conveyance speed of the belt and the conveyance distance until the copy paper is separated from the belt. At the time the copy sheet separates from the belt, the belt holds a different charge. Therefore, at this point, the copy paper receives a sudden change in the electric field, causing a charging phenomenon. As shown above, the degree of separation charge depends on the conveyance speed,
Varies depending on transport distance. Further, the polarity thereof is different from that of the belt; when the belt is positively charged, the separation charge is negative, and when the belt is negatively charged, the separation charge is positive. Normally, the polarity of the charge held by the belt and the polarity of the toner are different, so an attractive force is generated, but in separation charging, the polarity of the charge held by the belt is different, that is, the polarity of the toner is the same, so it becomes a repulsive force.
This causes image disturbance on copy paper. The degree of separation charging phenomenon varies depending on the resistance of the copy paper, and the higher the resistance, the more likely separation charging occurs. Several methods can be considered to suppress this separation charge as much as possible and prevent image disturbance. The first method is to eliminate static electricity when the copy paper is separated from the belt 75q, and the second method is to eliminate static electricity from the copy paper while it is being conveyed by the belt. The first method is: ■ Immediately after separating the copy paper from the belt, applying a charge opposite to the separation charge to the copy paper to cancel out the separation charge; - Immediately after the copy paper is separated from the belt, the separated and charged copy paper is applied to the charge eliminating material. This is a method of removing static electricity by bringing them close together. The second method is (1) to eliminate the charge on the belt that causes the separation charge before the copy paper is separated from the belt, and (2) to eliminate the charge at the time of separation. As method (2), a static eliminating material may be provided on the surface of the belt so that the belt itself has a neutralizing effect, and as method (2), static neutralizing material may be provided on the separation shaft. If the above-described static elimination operation is performed during the conveyance of the copy sheet or at the time of separation from the belt, separation charge can be prevented and image disturbance can be suppressed.

EXAMPLE Hereinafter, a transfer/conveyance apparatus according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a perspective view of the configuration of a transfer/conveyance device in a first embodiment of the present invention. In FIG. 1, 20 is a belt, which has a specific resistance of 10 to 10 Ω-m in order to obtain semiconducting characteristics. In order to ensure running stability, the belt 20 has elasticity, and may be made of rubber such as urethane resin, chloroprene rubber, or urethane resin, although its elasticity is slightly lower. Bell) 20 thickness is 0.3 to 0.6
Even if a dielectric layer with a thickness of about 20 mm or less is provided on the belt surface, the electrical characteristics will not be significantly affected. Reference numeral 24 denotes a separation shaft for separating the copy paper 6, which is made of a conductive material and has a diameter of φ2ol! in order to stabilize the separation performance of the copy paper e from the bell) 20. Use IIl+ or below. 26 is a transfer shaft for stretching the belt 20; 28 is a stretching shaft for stretching and driving the belt; 29
30 is a belt drive device, 34 is a pressing spring for pressing the belt 20 against the photoreceptor drum 2, 36 is a neutralizing charger, and 37 is a grounding device for grounding the separation shaft. The main plate 38 is a guide plate.

The operation of the transfer/conveyance device configured as described above will be explained below with reference to FIGS. 1, 2, and 3.

FIG. 2 shows a front view, and first, the surface of the photoreceptor drum 2 is uniformly charged by the photoreceptor charger 1. After charging, a latent image is formed by an exposure device 3 and visualized with toner by a developing device 4. The belt 20 includes a separation shaft 24, a transfer shaft 26,
The belt 2o is stretched between the stretching shafts 28 and attached to the photosensitive drum 2.
are in contact. The belt 2o is charged by the belt charger 29.
is positively charged and the surface potential of the belt 20 is increased by the belt charger 29.
The voltage of the high-voltage power supply applied to the belt charger 29 is adjusted so that the voltage is about +3000V. If the specific resistance of the belt 20 is 1010 to 1013 Ω, the surface potential on the belt 20 between the belt charger 29 and the separation shaft 24 is +2500
It will be about V. When the copy paper 6 is supplied from the copy paper supply device 6 and inserted between the photosensitive drum 2 and the belt 2o,
The copy paper 6 is polarized by the action of electric lines of force directed from the belt 2o toward the photoconductor drum 2, which are formed by the ground surface of the photoconductor drum and the electrical charges of the belt 20, and is electrostatically attracted to the belt 20. At this time, the charged particles are transferred to the copy paper by the action of the polarized charges. The copy paper 6 is conveyed to the separation shaft 24 while being electrostatically attracted to the belt 20.
As mentioned earlier, the belt 20 exhibits a high charge due to the slow charge leakage and the relationship between the conveyance speed and the conveyance distance, and the conveyance speed is 1o.
51Ml/S, the distance between the transfer shaft 26 and the separation shaft 24 is 12
In the case of about 0 mark, the surface potential of Pel 1-20 shows about +2,000 to +2,500 V near the separation axis. When the copy paper 6 is conveyed and separated from the belt 2o by the separation shaft 24, it exhibits a separation charging phenomenon. Although the degree of resistance varies depending on the resistance of the copy paper 6, the copy paper 6 left at room temperature and humidity
Now, if the belt 2o is positively charged and the charging level is as shown above, the separation charging potential will reach -6 to -6 KV. The static eliminating charger 36 is provided for the purpose of eliminating this separation charge, and the opening of the static neutralizing charger 36 is installed facing near the central axis of the separation shaft 24, so that the static electricity eliminating charger 36 is installed to face the vicinity of the central axis of the separation shaft 24, and when the copy paper 6 is separated from the belt 20. All you have to do is discharge it. The polarity of the discharge may be the same as that of the belt charger 29 since the separation charge is opposite to that of the belt 20. That is, the same power source as that for the transfer charger 29 can be used.

The static eliminating charger 36 suppresses separation and charging development of the copy paper 6,
The charge polarity of the copy paper 6 is not the same as that of the charged particles, that is, the charge is ○, or the charge is slightly positive (in this case,
The charged particles need only be negatively charged. Therefore, if the discharge from the neutralizing charger 36 is 10μ8 or more, it is sufficiently effective. FIG. 3 is a block diagram showing how the high-voltage power supply 41, resistor 42, and changeover switch 43 of the belt charger 29 and the neutralization charger 36 are connected. A belt charger 29 and a static eliminator 36 are connected in parallel to the output terminal of the high voltage power source 41, a resistor 42 is inserted between the static eliminator 36 and the high voltage power source 41, and a switch 43 is used to switch the resistance. By lowering the switching voltage and changing the discharge efficiency of the static eliminator charger 36, an appropriate amount of discharge can be applied to the copy paper 6. The separation shaft 24 is made of a conductive material that functions as a counter electrode for assisting the discharge of the charger 36, and must be grounded by a grounding plate 37. Constructing the separation shaft 24 from a conductive material is also necessary in order to leak the electric charge of the belt 20. The copy paper 6 separated from the belt 20 is conveyed to the fixing device 10 through the guide plate 38, and the toner image is fixed thereon.

As described above, according to this embodiment, transfer and conveyance is performed by a belt system, and by installing an antistatic charger at the time when the copy paper is separated from the belt, separation occurs when the copy paper is separated from the belt. Can prevent static electricity.

A second embodiment of the present invention will be described below with reference to the drawings.

FIG. 4 is a perspective view showing the vicinity of the separation shaft of a transfer conveyance device showing a second embodiment of the present invention. 20 is a belt, and 24 is a separation shaft, which is the same as the structure of the first factor. 1st
The difference from the configuration shown in the figure is that a static eliminating material 44 is provided on a guide plate 40 having conductive properties.

The operation of the transfer/conveyance device configured as described above will be described below.

A charge is applied to the belt 20 by the belt charger 29, the copy paper 6 is electrostatically attracted to the belt 20, and the copy paper 6 is conveyed. As mentioned earlier, this copy paper 6 is attached to the belt 2.
Separation charging occurs at the time of separation from 0. This electrical charge is removed by the static eliminating material provided on the grounded guide plate 4Q.
When the copy paper 6 passes over the guide plate 40, static electricity is eliminated.

As the static neutralizing material, for example, pure cotton cloth, silk, polyethylene, polyamide carbon fiber, etc. are used. When pure cotton cloth or silk contains a certain amount of water, it is a material that is hardly charged and has an electrical resistance of about 10 6 to 10 8 Ω-α, so that the internal moisture contributes to charge leakage and is effective in eliminating static electricity.

Polyethylene and polyamide have long carbon chains in their molecular structure, and carbon fibers connected in series are extremely effective in eliminating static electricity. These materials that do not charge themselves are extremely effective in removing static electricity.

In addition, in a guide plate made of a conductive material,
If the separation charge on the copy paper 6 is large, the conductive material will be polarized and electrostatically attracted, and the electric field will change rapidly due to the polarized charge, causing image disturbance, or if the guide plate is grounded. Although static electricity is removed by the rapid transfer of charges of opposite polarity from the ground plane, the electric field changes greatly and it is difficult to maintain an image. Therefore, 1o is placed on the guide plate 4o.
By providing a substance having a specific resistance of 8Ω or more, it is possible to compensate for the above-mentioned drawbacks and enhance the static elimination function. In FIG. 5, the guide plate 46 itself is made of a substance having a static eliminating function, and examples of the material include phenol resin. Phenol resin is also an effective neutralizing material. As shown above, this prevents rapid charge movement and suppresses changes in the electric field to keep the image stable. Furthermore, various conductive materials, especially metals such as iron, copper, and aluminum, can significantly charge themselves or the other material due to friction. This includes not only the problem of surface smoothness but also the problem of a contact potential difference caused by a difference in work function when metal and an insulator such as the copy paper 6 come into contact. In particular, it is thought that the physical properties of the copy paper 6 change depending on the state of water content, etc., and the contact potential difference changes. In particular, when the copy paper 6 is in an extremely dry state, the contact potential difference becomes too large, and the amount of charge transfer between the paper sheets increases, resulting in charging. Phenol is thought to function to lower this contact potential difference than metals.

Since it is closer to an insulator than a metal, it keeps the contact potential difference low and prevents charging. In this sense as well, phenolic resin is an extremely effective material.

By providing the guide plate with a static elimination function as described above,
Separation charging after the copy paper is separated from the belt can be suppressed.

FIG. 6 is a perspective view showing the vicinity of the separation shaft of a transfer/conveyance device showing a third embodiment of the present invention. 20 is a belt, and 24 is a separation shaft that is grounded. 38 is a guide plate, and the above is the first
The configuration is similar to that shown in the figure. The difference from the configuration shown in FIG. 1 is that a static eliminating material 44 is provided on the separation shaft 24.

The operation of the transfer/conveyance device configured as described above will be described below.

It has been mentioned many times that the copy paper 6 electrostatically attracted to the belt 20 is charged separately when it is separated from the belt 20.

This separation electrification was caused by the fact that the belt 20 exhibited a high electrification also on the separation shaft 24. Further, as described in the second embodiment, the separation shaft 24 made of a conductive material does not sufficiently contribute to neutralizing the belt 20 even though it is grounded. Furthermore, the belt 2o, which is made of a semiconducting material with a specific resistance of 1010 to 1013 Ω, is characterized in that it is difficult to transfer electric charge to the material that comes into contact with the belt. Therefore, in order to enhance the static elimination effect of the belt 20, a material with a high static elimination effect is used for the separation shaft. What is effective as the static eliminating material 43 is
A material that comes into contact with a charged object and causes charge to be transferred from the object.

Further, as mentioned above, it suppresses the charging caused by the contact potential difference and prevents charging due to contact.

In other words, it is a discharge path inserted between a charged body and a large-capacity object (such as the earth) that releases the charge, and it is an electrostatic resistance of a certain size that is distinguished from the so-called electrical resistance. Proceedings of the 6th National Conference of the Electrostatics Society 2P-D6
). Corresponding to electrical resistance, it is thought to be around 108 to 1010 Ω-α, although this is not a strict meaning.

This value coincides with the specific resistance value that effectively functions as the static eliminating material 43 as described in the second embodiment. Phenol resin is an effective material. This static eliminating material 43 is used on the separation shaft 24 to reduce the charge on the separation shaft 24 of the belt 2o.

Separation charging of the copy paper occurs in response to the amount of charge on the separation shaft of the belt 20, so it can be suppressed by enhancing the static elimination function of the separation shaft 24. In addition to the pure cotton cloth, silk, polyethylene, polyamide, and carbon fiber shown in Example 1 as the neutralizing material, materials with different charging series for the belt material, such as synthetic rubber such as urethane rubber, are used to check the charging status of the belt 2o. Possible substances are substances that can cause the change. When a fluorine-based material is wound around the separation shaft 24, the fluorine-based material itself tends to be negatively charged, so the bell 20 tends to be positively charged. When the belt 2o is positively charged, it tends to be charged rather than neutralized, but the belt 20
When the charge is negative (different from the case of Example 1 of the present invention),
When positively charged charged particles are transferred to the copy paper 6), it functions as a charge eliminating material. Static neutralizing materials do not simply remove electric charge, but can also function by utilizing positive charging between materials. By providing the charge eliminating function on the separation shaft as described above, it is possible to suppress separation charging after the copy paper is separated from the belt.

FIG. 7 is a front view showing a transfer conveyance section of a transfer conveyance device showing a fourth embodiment of the present invention. 20 is a belt, 24 is a separation shaft, 26 is a transfer shaft, 28 is a stretching shaft, 29 is a transfer charger, and 32 is a ground plate, which is the same as the structure shown in FIG. 1. The difference from the configuration shown in FIG. 1 is that a static eliminating material 43 is provided on the belt 2o.

The operation of the transfer/conveyance device configured as described above will be described below.

Separation charging occurs when the copy paper 6 is separated from the belt 20 because the electric charge held by the bell 20 is not sufficiently removed even when the copy paper reaches the separation shaft 24. Therefore, the belt 20 may be sufficiently neutralized to avoid sudden changes in the electric field at the time of separation. FIG. 7 shows a structure in which a static eliminating material 44 is attached on the belt 2o. As described in Examples 2 and 3, the role of the static eliminator 44 is to help remove charges between the grounded conductive material and the charged material. Therefore, originally, the configurations of the belt 2o and the static eliminating material 44 shown in FIG. 7 should be reversed (not shown). However, since the static eliminator 44 effectively leaks charge, when charge is applied to the static eliminator 43 by the transfer charger 29, charge is efficiently transferred (injected) to the belt.The belt 20 is charged and the static eliminator 43 cannot obtain the same effect. Therefore, in this embodiment, the static eliminating material 44 is placed on the belt 20.

With this configuration, the belt 20 can be effectively neutralized. As shown in the third embodiment, the static eliminating material 44 on the belt 2o may be made of a material that takes into consideration the difference in charging series from the copy paper 6, such as polyester fibers, acrylic fibers, etc. These materials tend to charge themselves negatively with respect to the copy paper 6 and charge the copy paper positively.

Pure cotton cloth, polyamide, etc., which are natural but have high static neutralizing properties, are effective. Although not shown in the drawings, it is also possible to mix these neutralizing materials into the belt 20 to control the charging of the belt.

In this case, it directly affects the charging function of the belt 20, and in order to function as a transfer/transport belt, the actual resistance of the belt 2Q must be set to 1010Ω-α after kneading the static eliminating material 43.
It is necessary to do more than that. As a result, even if the charge eliminating function is strong and charge leaks quickly, a large amount of charge is supplied on the transfer charger 29, so it is possible to form an electric field sufficient to transfer the charged particles onto the copy paper 6. That is, the charge retention ability of the belt 2o is suppressed by kneading the charge eliminating material 43, and the charge retention on the separation shaft 24 is reduced, thereby making it possible to prevent the copy paper 8 from being separated and charged. However, with this method,
If the static elimination function is too high, there is a risk that the electric charge that is the source of the attraction force between the copy paper 6 and the belt 20 will be lost, and the conveying force will be lost. This also applies to the case where the neutralizing material 43 is placed on the belt 20, and in this case, a dielectric layer for controlling charging may be provided on the top layer of the belt 20. Charge control must be considered in consideration of the combination of these materials, conveyance speed, conveyance distance, etc. For example, when the conveyance speed is 105/S and the distance between the transfer charger 29 and the separation shaft 24 is about 120111 m, the charge on the separation shaft 24 becomes almost zero when a pure cotton cloth is placed on the urethane rubber belt. However, during the conveyance, the belt 2o loses its charge and loses its conveying force.

This problem can be improved by using a belt 20 made of pure cotton cloth and polyamide. By providing the static eliminating function on the belt as described above, it is possible to suppress separation charging after the copy paper is separated from the belt.

Effects of the Invention As described above, the present invention provides a charged particle transport means for supporting and transporting charged particles, and a semiconducting substance that is close to the charged particle transport means and has a specific resistance of 1010 to 1013 Ω-(7). and a separating shaft made of a conductive material for stretching this belt, and one or more belts. a roller, a conveying means in which a separation shaft is disposed on the downstream side where the copy paper is conveyed, and a belt is stretched between the separation shaft and one or more rollers; a corona charger that is close to the particle transport means and has an opening facing the charged particle transport means, which applies an electric charge to the belt to electrostatically attract the copy paper;
The transfer means for transferring the charged particles from the charged particle conveyance means to the copy paper is opposed to the separation shaft, and has an opening such that it can discharge onto the conveyed copy paper; Equipped with a corona charger placed opposite near the central axis,
The belt, which has been given a υ charge by the transfer means, transfers the charged particles to the copy paper, and at the same time, the copy paper is electrostatically attracted to the belt and conveyed, and the charge generated when the copy paper is separated from the belt is reduced. This phenomenon can be suppressed by eliminating electricity at the time when the copy paper is separated from the belt, and it is possible to eliminate disturbance of charged particles on the copy paper.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a transfer/conveyance device in an embodiment of the cylinder 1 of the present invention, FIG. 2 is a front view of FIG. 1, FIG. 3 is a block diagram showing the connection between a high voltage power source and a resistor, and FIG. 4 , Figure 6 is the second
FIG. 6 is a perspective view of the vicinity of the separation shaft of the transfer/conveyance device in the third embodiment, and FIG. 7 is a perspective view of the vicinity of the separation shaft of the transfer/conveyance device in the fourth embodiment.
FIG. 8 is a front view of the transfer/conveyance unit of the conveyance device, and FIG. 8 is a front view of a conventional transfer/conveyance device. 20...Belt, 24...Separation shaft, 2
6...Transfer shaft, 28...Stretching shaft, 29
...Transfer charger, 3゜...Belt drive device, 32...Ground plate, 34...Press spring, 36...Static neutralization Charger, 38...
Guide plate, 42... Resistor, 43... Changeover switch, 44... Static elimination material. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 3
Figure 4th mouth 7th ward 32 curse C

Claims (1)

[Claims] A charged particle transport means that supports and transports charged particles, and a structure that is close to the charged particle transport means and has a specific resistance of 10^1^0.
A belt that is made of a substance having a resistance of ~10^1^3 Ω-cm and that holds a charge to electrostatically attract and convey copy paper, and a conductive material that stretches this belt. a separation shaft, one or more rollers, the separation shaft is disposed on the downstream side where the copy paper is transported, and a belt is stretched between the separation shaft and the one or more rollers. and a corona charger disposed within the conveying means, close to the charged particle conveying means, and having an opening facing the charged particle conveying means, which charges the belt and statically charges the copy paper. A transfer means for electrostatically adsorbing and transferring charged particles from a charged particle transport means to a copy sheet; Equipped with a corona charger that can be connected by selecting resistors with different resistance values by switching the terminals between the high-voltage input terminal and the high-voltage power supply output terminal, facing each other nearby.
The belt charged by the transfer means transfers the charged particles to the copy paper, and at the same time, the copy paper is electrostatically attracted to the belt and conveyed, and when the copy paper is separated from the belt, the belt is held. A transfer/conveyance device characterized by applying a charge of the same polarity as the charge using a corona charger.