JPH10228151A - Image forming device - Google Patents

Abstract

(57) [Problem] To improve the transfer efficiency so that the transfer of one color can be performed in one transfer when the length of the printing paper is equal to or less than the width of the development area of each color. It is an object of the present invention to provide an image forming apparatus according to the present invention. SOLUTION: A toner image carried on a toner image carrier 1 stretched by a plurality of rollers in a direction perpendicular to the transport direction of the printing paper 5 is transferred by a transfer facing roller 4 in a direction perpendicular to the transport direction of the printing paper 5. An image forming apparatus of an orthogonal transfer system for transferring the toner image transferred to the printing paper 5 to the printing paper 5 and fixing the toner image to the printing paper 5, the width being less than or equal to the width of the developing area on the toner image carrier 1 in the conveying direction of the printing paper 5 If the length of the print paper 5 in the transport direction of the print paper 5 is equal to or less than the transport distance of the print paper 5 set in the above, the transport distance extending means 21 is operated, and the developing area on the toner image carrier 1 is developed. The transport distance of the printing paper 5 is extended by the width of the non-development region sandwiched between the two.

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 capable of simultaneously transferring a plurality of sheets of printing paper when the printing paper is small.

[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. 11 is a schematic structural view of a conventional image forming apparatus, FIG. 12 is a perspective view showing a transfer process of the conventional image forming apparatus, and FIG. 13 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. 4 to 18 are schematic views showing a transfer state of the conventional image forming apparatus.

In FIGS. 11 to 12, a toner image carrier 1 composed of a photoreceptor 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 the arrow in FIG. 11, 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. The four primary color toner layers of cyan, magenta, yellow and black are shared by the built-in primary color toners. Are formed on the developing roller 11 of each of the four primary colors.
As shown in FIG. 13, 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. 14 to 17, a developing area of each color 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. 14 to 17, the width of the development area and the width of the non-development area are set to 1: 1.

As shown in FIG. 12, such an 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 at the time of transfer, and the printing is stopped. That is, the toner image carrier 1 is displaced by being rubbed (rubbed) on the sheet 5 with the movement of the transfer opposing roller 4. At this time, the displacement roller 3 is displaced following the movement of the transfer facing roller 4 in order to eliminate the slack of the toner image carrier 1.

Whenever the transfer for one process is completed, the transfer opposing roller 4 passes 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 conveyance of the printing paper 5 is started, but the conveyance distance of the printing paper 5 is only the width of the developing area of each color of the toner image carrier 1 represented by the toner layer of each color shown in FIGS. . 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. 14, 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. 15, in the third transfer, a {cyan, magenta} toner image is transferred in one step, so that the {cyan, magenta} toner image is superimposed on the first row. 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. 16, 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. 17, 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. Is only black.

[0014]

However, in the above-described conventional image forming apparatus, as shown in FIGS. 14 to 17, the conveying distance of the printing paper 5 is the toner image carrier 1 represented by the toner layer of each color. Is the width of the development area of each color. Therefore, as shown in FIG.
The length of the printing paper 5 in the transport direction of the printing paper 5 is equal to or less than the width of the developing area of each color of
Even in a special case where the transfer of the toner image for one color to the printing paper 5 is completed in one transfer process, the transfer distance of the printing paper 5 does not change. 5 has to be transported a plurality of times (two times in FIGS. 14 to 17), and the transfer efficiency is very poor.

The present invention solves the above problems, and when the length of the printing paper is equal to or less than the width of the developing area of each color,
It is an object of the present invention to provide an image forming apparatus in which transfer efficiency is improved so that transfer for one color can be performed in one transfer.

[0016]

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 in which a toner image transferred to a printing paper is fixed by transferring the toner image onto the printing paper in a direction orthogonal to the conveying direction of the printing paper by an opposing roller, and the toner image is held in the conveying direction of the printing paper. If the length of the print paper in the transport direction of the print paper is equal to or less than the transport distance of the print paper set to be equal to or less than the width of the development area on the body, the print paper is sandwiched by the development area on the toner image carrier. The configuration is such that the transport distance of the printing paper is extended by the width of the non-developing area.

According to the present invention, when the length of the printing paper is equal to or less than the width of the development area of each color, the transfer efficiency is improved so that all the colors can be transferred by one transfer. Image forming apparatus can be provided.

[0018]

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 image forming apparatus of an orthogonal transfer system in which a toner image transferred to a printing paper is fixed by transferring the toner image onto the printing paper in a direction orthogonal to a feeding direction of the printing paper by a roller, and a toner image carrier in a feeding direction of the printing paper is provided. Compared with the transport distance of the printing paper set below the width of the upper development area,
When the length of the print paper in the transport direction of the print paper is equal to or less than the length, the transport distance of the print paper is extended by the width of the non-development area sandwiched between the development areas on the toner image carrier. That is, the transfer of one color can be performed in one transfer, so that the transfer efficiency is improved.

According to a second aspect of the present invention, in the first aspect of the present invention, there is provided a configuration having a length measuring means for measuring the length of the printing paper in the transport direction of the printing paper. Since the length of the printing paper is automatically measured, the conveyance distance of the printing paper is automatically extended when the length of the printing paper satisfies the condition.

According to a third aspect of the present invention, in the first aspect of the present invention, a new print sheet is conveyed every time transfer of one color is completed. The configuration allows simultaneous transfer to the same number of printing papers as the number of development areas for each color on the toner image carrier, and allows simultaneous transfer of multiple sheets to be transferred to each printing paper in the development areas for each color. This has the effect that the transfer speed is greatly improved as a whole.

According to a fourth aspect of the present invention, in the first aspect of the present invention, the toner image carrier comprises a photosensitive belt, and the toner image carrier is formed based on an image signal. Exposure means for exposing the carrier, and a phenomena means for developing the toner image carrier is configured with,
Since the transfer for one color can be performed in one transfer, the transfer efficiency is improved.

Hereinafter, embodiments of the present invention will be described, in which the same parts as those of the conventional example are denoted by the same reference numerals.

(Embodiment 1) The outline of one embodiment of the present invention is that a business card whose transfer paper length is equal to or less than the width of the development area of each color of the toner image carrier is equal to or less than that. When using a small print sheet as described above, the transfer distance of the print sheet is extended, so that a plurality of sheets are simultaneously transferred to each print sheet in the development area of each color of the toner image carrier, and the entire image is transferred. This means that the transfer speed is greatly improved. 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 one embodiment of the present invention, and FIG. 2 is a perspective view showing a transfer process of the image forming apparatus according to one embodiment of the present invention. 3 and 4 are schematic diagrams showing the configuration of the length measuring means of the image forming apparatus according to one 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 illustrating a transfer method using a carrier sheet of the image forming apparatus according to one embodiment of the present invention, and FIG. 10 is a schematic diagram of a fixing unit of the image forming apparatus according to one embodiment of the present invention. FIG.

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. FIG.
In the same manner as in the conventional example shown in FIG. 1, the toner layers 1 of four colors of cyan, magenta, yellow, and black are
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.

In one embodiment of the present invention, there is provided a length measuring means for automatically measuring the length of a printing paper 5 as small as a business card (the length of the printing paper 5 in the transport direction). 20 and a transport distance extending means 21 for extending the transport distance of the printing paper 5 are different from the conventional example. As shown in FIGS. 3 and 4, two light receiving sensors 20a and 20b are arranged at a predetermined interval in the length measuring means 20, and the interval in this case is the developing distance shown in FIGS. The width of the area. As shown in FIG. 3, the printing paper 5 is conveyed at a stage before transfer (continuous conveyance instead of small-step conveyance), and when the leading end of the printing paper 5 interrupts light reception of the light receiving sensor 20a, the length of the printing paper 5 is measured. Is started,
As shown in FIG. 4, the leading end of the printing paper 5 is
If the rear end of the printing paper 5 has passed the light receiving sensor 20a at the time when the light reception of b is interrupted, the length of the printing paper 5 is measured to be equal to or less than the width of the development area. Printing paper 5 by length measuring means 20
If the length of the printing paper 5 is measured to be equal to or less than the width of the development area, the conveyance distance extending means 21 for extending the conveyance distance of the printing paper 5 automatically operates, and switches the conveyance distance of the printing paper 5 to { Is set to {width of development area + width of non-development area}.

As shown in FIGS. 5 to 8, 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 is set to be the same for each color. The ratio of the width of the development area to the width of the non-development area is {1: 1}, {2: 1},
The width of the development area and the width of the non-development area are set to {1: 1} in FIGS. 5 to 8, and the width of the development area can be set. Is set to be longer than the length of the short side of the business card.

When a business card size paper is used as the print paper 5, if the transport distance of the print paper 5 is increased by the width of the non-developing area, the development area of the next color can be obtained by one transport. The transfer of the next color can be performed quickly, and the simultaneous transfer of new printing paper 5 enables simultaneous processing of a plurality of printing papers 5. Is greatly improved.

In order to reduce the cost, the length measuring means 2 is used.
When the setting of 0 is omitted, the user may manually operate the transfer distance extending means 21 to switch the transfer distance.
When the user manually operates the transport distance extending means 21 to switch the transport distance, as shown in FIG. 9, a carrier sheet 23 in which a portion corresponding to the development area is coated with a weak adhesive material 22 is used. By using it, a plurality of business card size printing papers 5 are fixed on the carrier sheet 23,
It is also possible to transfer efficiently to a plurality of printing papers 5.

As is well known, the black color can be generated with the three primary colors of cyan, magenta and yellow without using black toner.
May be constituted by three developing means 7C, 7M, and 7Y.

FIG. 2 shows a state in which the printing paper 5 of the business card size is used. However, when the toner image is transferred to the printing paper 5, the transfer of the printing paper 5 is temporarily interrupted and the transfer plate 2 is used.
4 (see FIG. 1), the printing paper 5 is stopped, and the rotation of the toner image carrier 1 is stopped. Then, the transfer-opposed roller 4 is rolled from the back side of the toner image carrier 1 onto the printing paper 5
Transfer of the toner image by rubbing against the toner image carrier 1
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 toner image is sequentially separated from the printing paper 5 as the transfer opposing roller 4 passes. During the transfer step, a positive voltage is applied to the transfer plate 24 on which the printing paper 5 is placed, and the negatively charged toner image is drawn from the surface of the toner image carrier 1 to be separated and transferred to the printing paper 5. The transfer by the toner image carrier 1 can be performed not only on the forward path but also on the return path as described above. 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.

Each time the transfer for one process is completed, the transfer 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 conveyance of the printing paper 5 is started. When the printing paper 5 exceeds the business card size, the conveyance distance of the printing paper 5 is exactly the same as that in FIG. It is only the width of the area｝. Only when the printing paper 5 is smaller than the business card size, the conveyance distance of the printing paper 5 is extended from {the width of the development area} to {the width of the development area + the width of the non-development area} as described above, and the transfer for one process is performed. Each time is completed, a new printing paper 5 is sequentially conveyed.

As shown in FIG. 1, the cleaning means 8
Removes the residual toner on the surface of the toner image carrier 1 with a cleaning blade or a cleaning brush, collects the waste toner, and physically cleans the surface of the toner image carrier 1. Then, the charge removing unit 9 neutralizes the negative charge remaining on the surface of the toner image carrier 1 after removing the residual toner, and electrically cleans the surface of the toner image carrier 1. Note that the installation of the charge removing means 9 is not an essential requirement.

The method of forming a color toner image initially starts with the state shown in FIG. 5, but in the first transfer, only a {cyan} toner image is transferred in one step, so that the first printing Only the cyan toner image is transferred to the sheet 5. When the printing paper 5 is transported by the set transport distance {the width of the development area + the width of the non-development area}, the second transfer is performed as shown in FIG.

As shown in FIG. 6, in the second transfer, a {cyan, magenta} toner image is transferred in one step.
On the first printing paper 5, a {cyan, magenta} toner image is superimposed, while on the second printing paper 5, {cyan}
Is transferred. When the printing paper 5 is transported by the set transport distance {the width of the development area + the width of the non-development area}, the third transfer is performed as shown in FIG.

As shown in FIG. 7, in the third transfer, the toner image of {cyan, magenta, yellow} is transferred in one step, so that the {cyan, magenta, yellow} toner is A toner image of {cyan, magenta} is superimposed on the printing paper 5 in the second row. Only the toner image of {cyan} is transferred to the printing paper 5 in the third row. When the printing paper 5 is transported by the set transport distance {the width of the development area + the width of the non-development area}, the fourth transfer is performed as shown in FIG.

As shown in FIG. 8, in the fourth transfer, the toner image of {cyan, magenta, yellow, black} is transferred in one process. , Black} toner images are formed, and {cyan, magenta, yellow} toner images are superimposed on the printing paper 5 in the second row. The {cyan, magenta} toner image is superimposed on the printing paper 5 in the third column, but only the {cyan} toner image is transferred to the printing paper 5 in the fourth column.

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. Is only black.

After the above steps are repeated, the printing paper 5 is gradually sent 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. If the printing paper 5 is smaller than the business card size as shown in FIG.
After all the images have been transferred to the printing paper 5, the printing paper 5 is fixed at a stretch. However, if the printing paper 5 exceeds the business card size, the image is still being transferred,
Is in a stopped state, 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. As shown in FIG. 10, a fixing unit 25 composed of a heat source 26 and a reflection plate 27 is adopted, and a reflection plate 28 is provided below the fixing unit 25 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 claim 1 of the present invention, 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. That is, a toner image can be formed by forming an electrostatic latent image with a heat source and developing it.
This is because the toner image carrier can be blown off with an air jet after the solid coating with the toner by the developing means, and the toner image can be formed as if engraving a print.

[0042]

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 image forming apparatus of an orthogonal transfer system for transferring a toner image transferred to a printing paper in a direction perpendicular to a conveying direction of the printing paper and fixing the toner image transferred to the printing paper, the developing area on the toner image carrier in the conveying direction of the printing paper. If the length of the print paper in the transport direction of the print paper is equal to or less than the transport distance of the print paper set to be equal to or less than the width of the The transfer distance of the printing paper is extended by an amount corresponding to, so that the transfer for one color can be performed by one transfer, so that the transfer efficiency can be greatly improved.

[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 configuration of a length measuring unit of the image forming apparatus according to the embodiment of the present invention;

FIG. 4 is a schematic diagram showing a configuration of a length measuring unit of the image forming apparatus according to the embodiment of the present invention;

FIG. 5 is a schematic diagram showing a transfer state of the image forming apparatus according to the embodiment of the present invention;

FIG. 6 is a schematic diagram showing a transfer state of the image forming apparatus according to the embodiment of the present invention;

FIG. 7 is a schematic diagram showing a transfer state 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 method using a carrier sheet of the image forming apparatus according to one embodiment of the present invention.

FIG. 10 is a schematic diagram of a fixing unit of the image forming apparatus according to the embodiment of the present invention.

FIG. 11 is a schematic configuration diagram of a conventional image forming apparatus.

FIG. 12 is a perspective view showing a transfer process of a conventional image forming apparatus.

FIG. 13 is a schematic view showing a state of forming a toner layer of a developing roller of a conventional image forming apparatus.

FIG. 14 is a schematic diagram illustrating a transfer state of a conventional image forming apparatus.

FIG. 15 is a schematic diagram showing a transfer state 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.

[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 Seal material 16 Seal material 17 Fixing means 18 Pressure roller 19 Heating roller 20 Length measuring means 21 Transport distance extending means 22 Adhesive material 23 Carrier sheet 24 Transfer plate 25 Fixing means 26 Heat source 27 Reflector 28 Reflection Board

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Shinichi Kizu 1006 Kazuma Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. (72) Inventor Koji Mita 1006 Kadoma Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd.

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; An image forming apparatus of an orthogonal transfer system for transferring the toner image transferred to the printing paper and fixing the toner image transferred to the printing paper, the conveyance of the printing paper set to be equal to or less than the width of the developing area on the toner image carrier in the conveyance direction of the printing paper. If the length of the print paper in the transport direction of the print paper is less than or equal to the distance, the transport distance of the print paper is extended by the width of the non-development area sandwiched between the development areas on the toner image carrier. An image forming apparatus. 2. An image forming apparatus according to claim 1, further comprising a length measuring means for measuring a length of the printing paper in a conveying direction of the printing paper. 3. A new printing sheet is conveyed each time transfer of one color is completed, so that the printing can be simultaneously performed on the same number of printing sheets as the number of development areas of each color on the toner image carrier. The image forming apparatus according to claim 1, wherein: 4. A toner image carrier comprising a photoreceptor belt,
4. The image forming apparatus according to claim 1, further comprising: an exposure unit configured to expose the toner image carrier based on the image signal; apparatus.