JPH1138787A - Image forming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the floating of a printing paper at the time of printing, and to provide an image forming device by which the printing paper can be conveyed smoothly. SOLUTION: This image forming device is such a device of rectangularly transferring method that a toner image, carried on a toner-image carrier 1 spread by plural rollers in a rectangular direction against a conveying direction of a printing paper 5, is transferred on the printing paper 5 in a rectangular direction against a conveying direction of the printing paper 5 by a transcribing facing roller 4, and then, the toner image transferred on the printing paper 5 is fixed. And it is so composed that, in case of transferring on the printing paper 5 by an inverted applying means 22, the printing paper 5 is sucked by applying a voltage of a reverse polarity to the toner image, to a transfer plate 20 on which the printing paper 5 is put, and also, in case of conveying the printing paper 5, the polarity of an applying voltage is inverted and a voltage of the same polarity as the toner picture is applied, then, the attracted state at the time of conveying the printing paper 5 is released by neutralizing a remained charge of the transfer plate 20, and the printing paper 5 can be conveyed smoothly.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an orthogonal transfer type image forming apparatus for transferring a toner image onto a printing paper in a direction perpendicular to a conveying direction of the printing paper.

[0002]

2. Description of the Related Art In recent years, toner-type image forming apparatuses capable of forming clear images with excellent resolution, such as laser printers, have become widespread. Among such toner-type image forming apparatuses, Japanese Patent Application No. 7-328600.
As described above, the orthogonal transfer type image forming apparatus that moves the toner image carrier in a direction orthogonal to the transport direction of the printing paper and transfers the toner image in small steps at a time is a small-sized product due to its configuration. It is very suitable for promoting the conversion.

[0003] A conventional image forming apparatus which is compatible with color by the orthogonal transfer system will be described below.

FIG. 13 is a schematic structural view of a conventional image forming apparatus, FIG. 14 is a perspective view showing a transfer process of the conventional image forming apparatus, and FIG. 15 is a view showing a toner layer of a developing roller of the conventional image forming apparatus. It is a schematic diagram which shows a formation state. And FIG.
FIGS. 6 to 19 are schematic diagrams showing a transfer state of the conventional image forming apparatus.

Referring to FIGS. 13 and 14, a toner image carrier 1 composed of a photosensitive belt whose surface is coated with a layer of an organic photoconductive material comprises a support roller 2, a displacement roller 3,
It is stretched by a plurality of rollers such as the transfer opposing roller 4 in a direction orthogonal to the transport direction of the printing paper 5, and rotates in the direction of an arrow during image formation to form a toner image on the surface of the toner image carrier 1. . Around the toner image carrier 1, charging means 6, developing means 7, cleaning means 8, static elimination means 9 and the like are arranged, and an upper portion of the toner image carrier 1 is exposed to laser light. Means 10 are arranged. As shown by an arrow in FIG. 13, when the toner image carrier 1 rotates in a direction perpendicular to the conveying direction of the printing paper 5, the portion passing through the charging means 6 is uniformly charged to about -600V. Exposure means 10 irradiates the surface of toner image carrier 1 with laser light corresponding to the four primary colors on the surface of toner image carrier 1 based on the image signals of the four primary colors of cyan, magenta, yellow, and black. When the potential of the portion irradiated with the laser beam rises to about −100 V, an electrostatic latent image divided into four for each primary color is simultaneously formed on the surface of the toner image carrier 1. When four primary color toners are pressed against the portion where the electrostatic latent image is formed by the developing roller 11, toner images of the four primary colors, each of which becomes a visible image, appear on the toner image carrier 1 one after another.

[0006] As shown in FIGS.
Is composed of four parts for each primary color.
C is cyan, developing means 7M is magenta, developing means 7Y is yellow, and developing means 7B is black. Are formed on the developing roller 11 of each of the four primary colors.
As shown in FIG. 15, toner layers 1 of four colors of cyan, magenta, yellow, and black are applied to developing roller 11 from right.
2 are formed, and each toner layer 12 is separated by a gap 13 or a gap 14 to prevent color mixing. However, since these gaps 13 and 14 are sealed by sealing materials 15 and 16, The toner does not adhere. As shown in FIGS. 16 to 19, a developing area of each color to be developed by the developing means 7 is provided on the toner image carrier 1.
Although there is a non-development area sandwiched between the development areas, the width of the development area in the transport direction of the printing paper 5 is set to be the same for each color. In particular, in FIGS. 16 to 19, the width of the development area and the width of the non-development area are set to 1: 1.

As shown in FIG. 14, the orthogonal transfer type image forming apparatus is characterized in that the rotation of the toner image carrier 1 and the conveyance of the printing paper 5 are temporarily stopped during the transfer, and The toner image carrier 1 is displaced by being rubbed (rubbed) along with the movement of the transfer opposing roller 4 on the printing paper 5 that is stationary above (see also FIG. 13). At this time, the displacement roller 3 is used to prevent the toner image carrier 1 from sagging.
Is displaced following the movement of the transfer opposing roller 4.

[0008] When the printing paper 5 is transferred, as shown in FIG.
Is stopped, the printing paper 5 is stopped on the transfer plate 20 (see also FIG. 13), and the rotation of the toner image carrier 1 is also stopped. Then, the portion of the toner image carrier 1 where the four primary color toner images are formed is rubbed against the printing paper 5 by rolling the transfer opposing roller 4 from the back side to transfer the four primary color toner images. Is displaced in the opposite direction from the left end or the right end by one step. At this time, the transfer end surface of the toner image carrier 1 after the transfer of the four primary color toner images is
As the sheet passes through the transfer opposing roller 4, it is sequentially separated from the printing paper 5.

The transfer by the toner image carrier 1 can be performed not only on the outward path but also on the return path. At this time, when the moving direction of the toner image carrier 1 is viewed from the printing paper 5 side, the toner image carrier 1 is displaced on the printing paper 5 in a direction orthogonal to the transport direction of the printing paper 5.

[0010] During the transfer step, the printing paper 5
If the printing paper 5 is not prevented from floating from the transfer plate 20 and the slippage of the printing paper 5 is not prevented, there is a possibility that a printing shift occurs. In order to suppress the occurrence of printing deviation, the application unit 21 applies a positive voltage having a polarity opposite to that of the toner image to the transfer plate 20 to apply a positive charge. Then, the printing paper 5 is electrostatically attracted by the static electricity generated on the surface of the transfer plate 20, and
Will be temporarily tied up. Then, the transfer plate 20 to which the positive voltage is applied draws the negatively charged toner images of the four primary colors from the surface of the toner image carrier 1 to be peeled off and transferred to the printing paper 5.

Whenever the transfer for one process is completed, the transfer opposing roller 4 moves over the printing paper 5 and moves out of the area of the printing paper 5, so that the toner image carrier 1 is separated from the printing paper 5. . Then, the application unit 21 stops applying the voltage, the binding of the printing paper 5 electrostatically attracted to the transfer plate 20 is released, and the transportation of the printing paper 5 is started. 16 to 19, only the width of the development area of each color of the toner image carrier 1 represented by the toner layer of each color shown in FIG. The printing paper 5 is intermittently sent to the fixing means 17 by the width of the development area of each color, and the fixing means 17 applies the printing paper 5 on which the image is transferred to a pressure roller 18 and a heating roller 19 having a heat source inside. The toner particles are melted and fixed on the printing paper 5.

The method of forming a color toner image initially starts with the state shown in FIG. 16, but in the first transfer, only a {cyan} toner image is transferred in one step.
In the column, only the cyan toner image is transferred. When the printing paper 5 is conveyed by the width of the development area, the second transfer is performed. However, even in the second transfer, only the cyan image is transferred in one process, so that the cyan in the second column is also transferred. Is transferred.

Next, as shown in FIG. 17, in the third transfer, the {cyan, magenta} toner image is transferred in one step, so the {cyan, magenta} toner image is superimposed on the first column. In the third column, only the {cyan} toner image is transferred. When the printing paper 5 is transported by the width of the developing area,
Similarly, the fourth transfer is performed. Even in the fourth transfer, the {cyan, magenta} toner image is transferred in one process, so the {cyan, magenta} toner image is superimposed on the second column. In the fourth row, only the {cyan} toner image is transferred.

Next, as shown in FIG. 18, in the fifth transfer, a {cyan, magenta, yellow} toner image is transferred in one step, so that the {cyan, magenta, yellow} toner image is in the first column. In the third column, a {cyan, magenta} toner image is superimposed. In the fifth column, only the {cyan} toner image is transferred. When the printing paper 5 is conveyed by the width of the development area, the sixth transfer is performed in the same manner. Even in the sixth transfer, {Cyan, Magenta, Yellow} is performed in one process.
, The second column overlaps the cyan, magenta and yellow toner images, the fourth column overlaps the cyan and magenta toner images, and the sixth column overlaps the cyan image. Is transferred.

Thereafter, as shown in FIG. 19, in the seventh transfer, the toner image of {cyan, magenta, yellow, black} is transferred in one process, so the first column is {cyan, magenta, yellow, black}. A color toner image is formed by the toner images of
A yellow toner image is superimposed. In the fifth column, the {cyan, magenta} toner image is superimposed, but in the seventh column, only the {cyan} toner image is transferred.

At the end of the transcription, the reverse path is just followed,
In the process, cyan, magenta, yellow, and black toner images were transferred, but cyan was missing, and magenta, yellow, and black were lost, and magenta was missing, resulting in yellow and black. Is only black.

[0017]

However, in the conventional image forming apparatus as described above, as shown in FIG.
Toner image carrier 1 is placed on printing paper 5 resting on transfer plate 20.
Is rubbed by the transfer opposing roller 4 to transfer the toner image. A positive voltage is applied to the transfer plate 20 by the application unit 21 in order to apply a charge having a polarity opposite to that of the toner image. The printing paper 5 is attracted. For this reason, in order to prevent the printing paper 5 from floating from the transfer plate 20 and to prevent the printing paper 5 from skidding and eliminate the printing deviation, it is necessary to increase the applied voltage. However, if the applied voltage is too high, the charge remains for a while even after the application is stopped, so that apparently the friction coefficient between the printing paper 5 and the transfer plate 20 increases, and There is a problem that the conveyance of the paper 5 does not proceed smoothly.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems and to provide an image forming apparatus which can prevent the printing paper from floating during printing and can smoothly transport the printing paper.

[0019]

SUMMARY OF THE INVENTION In order to solve this problem, the present invention provides a method for transferring a toner image carried on a toner image carrier stretched by a plurality of rollers in a direction perpendicular to a conveying direction of a printing paper. An orthogonal transfer type image forming apparatus that transfers to a printing paper in a direction orthogonal to the transport direction of the printing paper by an opposing roller and fixes the toner image transferred to the printing paper. A voltage of the opposite polarity to that of the toner image is applied to the transfer plate on which the paper is placed, and the printing paper is attracted. At the time of transporting the printing paper, the polarity of the applied voltage is reversed and a voltage of the same polarity as the toner image is applied. The configuration is such that:

According to the present invention, it is possible to provide an image forming apparatus capable of preventing the printing paper from floating during printing and smoothly transporting the printing paper.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the first aspect of the present invention, a toner image carried on a toner image carrier stretched by a plurality of rollers in a direction perpendicular to a conveying direction of a printing paper is transferred and opposed. An orthogonal transfer type image forming apparatus in which the toner image transferred onto the printing paper is fixed by transferring the printing paper to the printing paper in a direction orthogonal to the conveyance direction of the printing paper by a roller. A voltage having a polarity opposite to that of the toner image is applied to the transfer plate on which the toner image is to be applied, and the printing paper is attracted. When transporting the printing paper, the polarity of the applied voltage is reversed and a voltage having the same polarity as the toner image is applied. When printing, printing paper can be prevented from floating by electrostatically attracting it to the transfer plate, and when transporting printing paper, the residual charge on the transfer plate is canceled, eliminating the attracted state. Printing paper transport in a circle Such an action can be performed.

According to a second aspect of the present invention, in the first aspect of the invention, the toner image carrier comprises a photoreceptor belt, and an exposure means for exposing the toner image carrier based on an image signal; And a developing unit for developing the image carrier.When printing, the printing paper can be prevented from floating by electrostatically attracting to the transfer plate, and when conveying the printing paper. Since the residual charge on the transfer plate is canceled, the attracted state is eliminated, and the printing paper can be transported smoothly.

According to a third aspect of the present invention, in the second aspect of the invention, the developing means is configured to develop only a single color, and is electrostatically attracted to a transfer plate during printing. This has the effect that floating of the printing paper can be prevented, and the residual charge of the transfer plate is canceled when the printing paper is transported, so that the attracted state is eliminated and the transport of the printing paper can be performed smoothly.

According to a fourth aspect of the present invention, in the second aspect, the developing means comprises at least cyan,
It is configured to develop using the four primary colors of magenta, yellow and black. At the time of printing, the printing paper can be prevented from floating by being electrostatically attracted to the transfer plate. Has the effect of canceling the residual charge on the transfer plate, so that the attracted state is eliminated and the printing paper can be transported smoothly.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
As will be described with reference to FIG. 12, the same portions as those in the conventional example are denoted by the same reference numerals.

(Embodiment 1) The outline of one embodiment of the present invention is that an inversion applying means is provided in place of the applying means of the conventional example, and the inversion applying means is based on residual charges caused by a voltage applied at the time of transfer to printing paper. In order to eliminate the suction state of the printing paper, when the printing paper is transported, a voltage of the opposite polarity to that at the time of transfer is applied by the reversal applying means to eliminate the residual charge or reduce it to the extent that the suction state of the printing paper does not occur It is something that was devised to do.

More specifically, when the toner image is transferred to the printing paper, a voltage is applied to the transfer plate to attract the printing paper from the viewpoint of preventing floating of the printing paper. Even if the application of the voltage is interrupted for the conveyance, the electric charge does not disappear immediately, and for a while, the print sheet is attracted to the transfer plate by the residual electric charge. In this state, apparently, the coefficient of friction between the transfer plate and the printing paper seems to increase, and the conveyance of the printing paper does not proceed smoothly.
When the printing paper is conveyed, in order to cancel the residual charge by the reversal applying means, a voltage of the opposite polarity to the voltage applied at the time of transfer is applied to erase the charge on the transfer plate, and apparently the friction coefficient is reduced. The invention is devised so that the printing paper can be smoothly conveyed in a reduced manner.

Note that the absolute value of the voltage applied by the reversal applying means and the application time for canceling the residual charge on the surface of the transfer plate may be lower than the absolute value of the voltage applied for attracting the printing paper. In addition, the application time may be extremely short.

FIG. 1 shows the details of an embodiment of the present invention.
This will be described with reference to FIGS. FIG. 1 is a schematic configuration diagram of an image forming apparatus according to an embodiment of the present invention.
3 is a perspective view illustrating a transfer process of the image forming apparatus according to the embodiment of the present invention, and FIGS. 3 and 4 are schematic diagrams illustrating a state of forming a toner layer of a developing roller of the image forming apparatus according to the embodiment of the present invention. FIG. FIGS. 5 to 7 are schematic views showing the state of application of the reversal applying means of the image forming apparatus according to one embodiment of the present invention, and FIGS. 8 to 11 are image forming apparatuses according to one embodiment of the present invention. FIG. 5 is a schematic diagram showing a state of transfer of the image. FIG. 12 is a schematic diagram of a fixing unit of the image forming apparatus according to one embodiment of the present invention.

In FIG. 1 and FIG. 2, a toner image carrier 1 composed of a photoreceptor belt whose surface is coated with a layer of an organic photoconductive material comprises a plurality of support rollers 2, displacement rollers 3, transfer opposing rollers 4, and the like. These rollers are stretched in the direction perpendicular to the direction in which the printing paper 5 is conveyed by the rollers, and rotate in the direction of an arrow during image formation, whereby a toner image is formed on the surface of the toner image carrier 1. Around the toner image carrier 1,
A charging unit 6, a developing unit 7, a cleaning unit 8, a charge removing unit 9 and the like are arranged, and an exposure unit 10 for irradiating a laser beam is arranged above the toner image carrier 1. In the embodiment of the present invention, a case where a laser is used as a typical example of the exposure unit 10 will be described. However, the exposure unit 10 may use not only a laser but also an LED or an LCD. As shown by an arrow in FIG. 1, when the toner image carrier 1 rotates in a direction perpendicular to the direction in which the printing paper 5 is conveyed, the portion passing through the charging means 6 becomes -6.
It is uniformly charged to about 00V. Exposure means 10 is cyan,
Based on the image signals of the four primary colors of magenta, yellow, and black, one line of the surface of the toner image carrier 1 is irradiated with laser light corresponding to the four primary colors. When the potential of the portion irradiated with the laser beam rises to about −100 V, an electrostatic latent image divided into four for each primary color is simultaneously formed on the surface of the toner image carrier 1. When four primary color toners are pressed against the portion where the electrostatic latent image is formed by the developing roller 11, toner images of the four primary colors, each of which becomes a visible image, appear on the toner image carrier 1 one after another.

As shown in FIGS. 1 and 2, the developing means 7 is composed of four parts for each primary color. The developing means 7C is cyan, the developing means 7M is magenta, the developing means 7Y is yellow, and the developing means 7B The toner layers of the four primary colors of cyan, magenta, yellow, and black are formed on the common developing roller 11 so as to be divided into four for each of the primary colors by using the primary color toners contained therein. As shown in FIG. 3, a toner layer 12 of four colors of cyan, magenta, yellow, and black is formed on the developing roller 11 from the right, and each toner layer 12 has a gap 13 for preventing color mixing.
Alternatively, it is separated by the gap 14, but this gap 13,
The portion 14 is sealed by the sealing materials 15 and 16, so that the toner does not normally adhere thereto. FIG. 3 shows a color developing roller 1 according to claim 4.
Although one example has been described, light cyan or light magenta may be added in addition to the four primary colors in order to reproduce the color tone of a photograph or the like. Further, as shown in FIG. 4, the developing roller 11 itself may correspond to a single color such as black according to “Claim 3”.
4 is sealed by the sealing material 16.

At the time of transfer to the printing paper 5, as shown in FIG.
0 (see also FIG. 1) while the printing paper 5 is stationary.
The rotation of the toner image carrier 1 is also stopped. Then, the portion of the toner image carrier 1 where the four primary color toner images are formed is rubbed against the printing paper 5 by rolling the transfer opposing roller 4 from the back side to transfer the four primary color toner images.
Is displaced in the opposite direction from the left end or the right end by one step. At this time, the transfer end surface of the toner image carrier 1 on which the transfer of the toner images of the four primary colors has been completed is sequentially separated from the printing paper 5 as the transfer opposing roller 4 passes.

The transfer by the toner image carrier 1 can be performed not only on the outward path but also on the return path. At this time, when the moving direction of the toner image carrier 1 is viewed from the printing paper 5 side, the toner image carrier 1 is displaced on the printing paper 5 in a direction orthogonal to the transport direction of the printing paper 5.

During the transfer step as shown in FIG. 5, the printing paper 5 may be prevented from floating from the transfer plate 20 during the transfer, and the printing paper 5 may be misaligned unless the printing paper 5 is prevented from skidding. is there. Therefore, in order to suppress the occurrence of printing deviation, the reversal applying unit 22 applies a positive voltage having a polarity opposite to that of the toner image to the transfer plate 20 so that a positive charge is applied. Then, the printing paper 5 is electrostatically attracted by the static electricity generated on the surface of the transfer plate 20 and is temporarily bound on the transfer plate 20. Then, the transfer plate 20 to which the positive voltage is applied
Indicates that the negatively charged four primary color toner images are transferred to the toner image carrier 1
, And is peeled off and transferred to the printing paper 5.

As shown in FIG. 6, every time the transfer for one process is completed, the transfer opposing roller 4 passes over the print paper 5 and moves out of the area of the print paper 5 so that the toner image carrier 1 is transferred. Is separated from the printing paper 5. Then, in order to solve the problem of the residual charge, which is a problem of the conventional example, in the present invention, the polarity of the voltage applied by the inversion applying means 22 is reversed, and the residual charge on the surface of the transfer plate 20 disappears or the residual charge is eliminated. And a negative voltage having the same polarity as that of the toner image is applied to such an extent that the printing paper 5 is absorbed by the printing paper 5. Note that the absolute value of the voltage applied by the inversion applying means 22 and the application time for canceling the residual charge on the surface of the transfer plate 20 may be lower than the absolute value of the voltage applied for attracting the printing paper 5. In addition, the application time may be extremely short.

As shown in FIG. 7, when the reversal applying means 22 stops the application, the printing paper 5 electrostatically attracted to the transfer plate 20 is already unbound, so that the printing paper 5 is transported in a conventional manner. Unlike the example, the operation is performed smoothly without being affected by the residual charge. The conveyance distance of the printing paper 5 is shown in FIGS.
This is only the width of the development area of each color of the toner image carrier 1 represented by the toner layer of each color shown in FIG.

While the printing paper 5 is being conveyed, as shown in FIG. 1, the cleaning means 5 removes residual toner on the surface of the toner image carrier 1 by using a cleaning blade or a cleaning brush to generate waste toner. The collected toner image carrier 1 is physically cleaned. Then, the charge removing means 9 is provided for the toner image carrier 1 after removing the residual toner.
The surface of the toner image carrier 1 is electrically cleaned by neutralizing the negative charges remaining on the surface of the toner image carrier 1. Note that the installation of the charge removing means 9 is not an essential requirement.

As shown in FIGS. 8 to 11, the toner image carrier 1 has a developing area for each color developed by the developing means 7 and a non-developing area sandwiched between the developing areas. The width of the development area in the transport direction of No. 5 is set to be the same for each color. In particular, in FIGS. 8 to 11, the width of the development area and the width of the non-development area are set to 1: 1. Less than,
A method for forming a color toner image will be described, which is the same as the conventional example.

The method of forming a color toner image initially starts with the state shown in FIG. 8, but in the first transfer, only a {cyan} toner image is transferred in one step, so Only the cyan toner image is transferred. When the printing paper 5 is conveyed by the width of the development area, the second transfer is performed. However, even in the second transfer, only the cyan image is transferred in one process, so that the cyan in the second column is also transferred. Is transferred.

Next, as shown in FIG. 9, in the third transfer, the {cyan, magenta} toner image is transferred in one step, so the {cyan, magenta} toner image is superimposed on the first column. In the third column, only the {cyan} toner image is transferred. When the printing paper 5 is conveyed by the width of the developing area, the fourth transfer is performed in the same manner. However, even in the fourth transfer, the {cyan, magenta} toner image is transferred in one process, so the second column is transferred. In the fourth column, only the {cyan} toner image is transferred.

Next, as shown in FIG. 10, in the fifth transfer, a {cyan, magenta, yellow} toner image is transferred in one step, so that the {cyan, magenta, yellow} toner image is in the first column. In the third column, a {cyan, magenta} toner image is superimposed. In the fifth column, only the {cyan} toner image is transferred. When the printing paper 5 is conveyed by the width of the development area, the sixth transfer is performed in the same manner. Even in the sixth transfer, {Cyan, Magenta, Yellow} is performed in one process.
, The second column overlaps the cyan, magenta and yellow toner images, the fourth column overlaps the cyan and magenta toner images, and the sixth column overlaps the cyan image. Is transferred.

Thereafter, as shown in FIG. 11, in the seventh transfer, the toner image of {cyan, magenta, yellow, black} is transferred in one process, so the first column is {cyan, magenta, yellow, black}. A color toner image is formed by the toner images of
A yellow toner image is superimposed. In the fifth column, the {cyan, magenta} toner image is superimposed, but in the seventh column, only the {cyan} toner image is transferred.

The last part of the transcription follows exactly the opposite path,
In the process, cyan, magenta, yellow, and black toner images were transferred, but cyan was missing, and magenta, yellow, and black were lost, and magenta was missing, resulting in yellow and black. Is only black.

After repeating the above steps, the printing paper 5 is gradually fed to the fixing means 17 as shown in FIG.
The fixing means 17 sandwiches the printing paper 5 on which the image has been transferred between the pressing roller 18 and the heating roller 19 having a heat source therein, melts the toner particles, and fixes the toner particles on the printing paper 5. After all the images have been transferred to the printing paper 5,
Since the printing paper 5 is carried out without stopping, the heat source of the heating roller 19 may be kept on. However, printing paper 5
When the image is being transferred to the printing paper 5, the printing paper 5 is in a stopped state, so it is necessary to temporarily turn off the heat source of the heating roller 19 or to move the heating roller 19 away from the printing paper 5. Further, as shown in FIG. 12, a fixing unit 23 composed of a heat source 24 and a reflecting plate 25 is employed, and a reflecting plate 26 is provided below the fixing unit 23 to improve thermal efficiency. There is also a method of fixing without contacting the toner. Thus, a series of image forming steps is completed.

Finally, to briefly describe what is related to the "claim 2", it is not always necessary to use a photoreceptor for the toner image carrier, and there is a case where no exposing means is required. This is because a toner image can be formed by forming an electrostatic latent image with a heat source and developing it, or by blowing off a solid-coated toner image carrier with an air jet, as if carving a print. This is because a toner image can also be formed.

[0046]

As described above, according to the present invention, a toner image carried on a toner image carrier stretched by a plurality of rollers in a direction orthogonal to the transport direction of the printing paper is transferred to the printing paper by a transfer opposing roller. An orthogonal transfer type image forming apparatus for transferring a toner image transferred to a printing paper in a direction orthogonal to a conveying direction of the printing paper and fixing the toner image transferred on the printing paper. A voltage of the opposite polarity to that of the toner image is applied to the print paper to attract the print paper, and when transporting the print paper, the polarity of the applied voltage is reversed to apply a voltage of the same polarity as the toner image. In printing, floating of the printing paper can be prevented by electrostatic attraction to the transfer plate during printing, and residual charge on the transfer plate is canceled when transporting the printing paper, so that the attracted state is eliminated and the printing paper is transported. Do it smoothly Can.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an image forming apparatus according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a transfer process of the image forming apparatus according to the embodiment of the present invention;

FIG. 3 is a schematic diagram showing a state of forming a toner layer of a developing roller of the image forming apparatus according to the embodiment of the present invention;

FIG. 4 is a schematic view showing a state of forming a toner layer of a developing roller of the image forming apparatus according to the embodiment of the present invention;

FIG. 5 is a schematic diagram showing a state of application of an inversion applying unit of the image forming apparatus according to the embodiment of the present invention;

FIG. 6 is a schematic diagram showing a state of application of an inversion applying unit of the image forming apparatus according to the embodiment of the present invention;

FIG. 7 is a schematic diagram showing a state of application of an inversion applying unit of the image forming apparatus according to the embodiment of the present invention;

FIG. 8 is a schematic diagram showing a transfer state of the image forming apparatus according to the embodiment of the present invention;

FIG. 9 is a schematic diagram showing a transfer state of the image forming apparatus according to the embodiment of the present invention;

FIG. 10 is a schematic diagram illustrating a transfer state of the image forming apparatus according to the embodiment of the present invention;

FIG. 11 is a schematic diagram showing a transfer state of the image forming apparatus according to the embodiment of the present invention;

FIG. 12 is a schematic diagram of a fixing unit of the image forming apparatus according to the embodiment of the present invention.

FIG. 13 is a schematic configuration diagram of a conventional image forming apparatus.

FIG. 14 is a perspective view showing a transfer process of a conventional image forming apparatus.

FIG. 15 is a schematic view illustrating a state of forming a toner layer of a developing roller of a conventional image forming apparatus.

FIG. 16 is a schematic diagram illustrating a transfer state of a conventional image forming apparatus.

FIG. 17 is a schematic diagram illustrating a transfer state of a conventional image forming apparatus.

FIG. 18 is a schematic diagram illustrating a transfer state of a conventional image forming apparatus.

FIG. 19 is a schematic diagram illustrating a transfer state of a conventional image forming apparatus.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 toner image carrier 2 support roller 3 displacement roller 4 transfer opposing roller 5 printing paper 6 charging means 7 developing means 7C developing means 7M developing means 7Y developing means 7B developing means 8 cleaning means 9 discharging means 10 exposure means 11 developing roller 12 toner Layer 13 Gap 14 Gap 15 Sealing material 16 Sealing material 17 Fixing means 18 Pressure roller 19 Heating roller 20 Transfer plate 21 Applying means 22 Inversion applying means 23 Fixing means 24 Heat source 25 Reflector 26 Reflector

Claims (4)

[Claims] A transfer roller configured to transfer a toner image carried on a toner image carrier stretched by a plurality of rollers in a direction perpendicular to a transport direction of the print paper in a direction perpendicular to the transport direction of the print paper by a transfer opposing roller; This is an orthogonal transfer type image forming device that transfers the toner image to the printing paper and fixes the toner image transferred to the printing paper. When transferring the image to the printing paper, a voltage having a polarity opposite to that of the toner image is applied to the transfer plate on which the printing paper is placed. An image forming apparatus for applying a voltage having the same polarity as that of the toner image by inverting the polarity of the applied voltage when transporting the print paper. 2. A toner image bearing member comprising a photosensitive belt,
2. The image forming apparatus according to claim 1, further comprising: an exposing unit that exposes the toner image carrier based on the image signal; and a developing unit that develops the toner image carrier. 3. An image forming apparatus according to claim 2, wherein said developing means develops only a single color. 4. The developing means comprises at least cyan, magenta,
3. The image forming apparatus according to claim 2, wherein development is performed using four primary colors of yellow and black.