JP2002258578A - Image forming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image forming device constituted so that a separation distance between a photoreceptor adjacent to a photoreceptor which is kept in press contact with an intermediate transfer belt and the intermediate transfer belt can be satisfactorily secured. SOLUTION: The image forming device is provided with the intermediate transfer belt constituted of an endless belt which is moved along a nearly straight moving path and at least three toner image forming units arranged along the nearly straight moving path, and the intermediate transfer belt is arranged while relatively displacing so as to separate from or come in press contact with the photoreceptor related with a toner image forming unit other than the 1st photoreceptor related with the 1st toner image forming unit, and the transfer position of the 2nd photoreceptor related with the 2nd toner image forming unit adjacent to the 1st toner image forming unit is positioned opposite to the intermediate transfer belt across a common tangent between the transfer position of the 1st photoreceptor and the transfer position of the 3rd photoreceptor related with the 3rd toner image forming unit adjacent to the opposite side of the 1st toner image forming unit.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an image forming apparatus having at least three toner image forming units.

[0002]

2. Description of the Related Art For example, in a certain type of color image forming apparatus using an electrophotographic system, for example, four toner image forming units each having a photosensitive member on each surface of which a toner image is formed, and these toner image forming units are formed. A toner image forming apparatus having an intermediate transfer belt formed of an endless belt for transferring and carrying the toner image formed by the unit. The different color toner images
After the primary transfer toner image is sequentially transferred to the surface of the circulating intermediate transfer belt to form a superimposed primary transfer toner image, the secondary transfer unit collectively transfers the primary transfer toner image onto the surface of the recording material in a batch, thereby obtaining a plurality of images. Is formed.

As shown in FIG. 6, such an image forming apparatus usually has four toner image forming units (not shown).
Are arranged in parallel with the linear moving path of the intermediate transfer belt 43 in the transfer area where the toner image is transferred. The photoconductors 41Y, 41M, 41C, and 41K related to the four toner image forming units all have the same outer diameter, and each of the photoconductors 41Y, 41Y,
The rotation axes of 41M, 41C, and 41K are arranged on one straight line L6. By operating all of the four toner image forming units, a so-called full-color image can be formed, and the photoconductor 41K related to one of the four toner image forming units is selected. Thus, a monochrome image can be formed only with black toner, for example.

[0004]

When a monochrome image is to be formed, the intermediate transfer belt 43 is pressed against the photosensitive member 41K and the other photosensitive members 41Y, 41M, 41C.
Moving along a moving path located on a straight line connecting the roller 45a located at one end side of the transfer area and the roller 45b located at the other end side of the transfer area in a state separated from the transfer area. As a result, as is clear from FIG. 6, the distance between the intermediate transfer belt 43 and the photosensitive member that is necessarily closer to the photosensitive member 41K becomes smaller. There is a possibility that the photoconductor 41C adjacent to the body 41K may come into contact with the photoconductor 41C. In such a case, the toner image is disturbed.

As described above, in the photosensitive member adjacent to the photosensitive member in which the intermediate transfer belt is constantly pressed, there is a possibility that a sufficient separation distance from the intermediate transfer belt may not be secured. There is.

[0007] The above situation arises in an image forming apparatus provided with a toner image forming apparatus having a recording material conveying belt formed of an endless belt for supporting a recording material on which a toner image is transferred instead of the intermediate transfer belt. Is the same.

[0008]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a photosensitive member adjacent to a photosensitive member in which an intermediate transfer belt is constantly pressed. An object of the present invention is to provide an image forming apparatus capable of sufficiently securing a separation distance between a body and the intermediate transfer belt. Another object of the present invention is to provide an image capable of sufficiently securing a separation distance between a photosensitive member adjacent to a photosensitive member which is normally in pressure contact with the recording material transport belt and the recording material transport belt. An object of the present invention is to provide a forming apparatus.

[0009]

According to the present invention, there is provided an image forming apparatus comprising: an intermediate transfer belt including an endless belt which is moved along a substantially linear moving path in a transfer area where a toner image is transferred; At least three toner image forming units arranged along the substantially linear movement path of the intermediate transfer belt, wherein each of the toner image forming units has a surface on which a toner image is formed. And the intermediate transfer belt is provided in a state of being pressed against a first photoconductor of the first toner image forming unit located at an end of the transfer area, The other toner image forming unit is provided so as to be relatively displaced between a separated state and a pressed state with respect to a photosensitive member, and is adjacent to the first toner image forming unit. The transfer position of the second photoconductor related to the second toner image forming unit is related to the transfer position of the first photoconductor and the third toner image forming unit adjacent to the opposite side of the first toner image forming unit. With respect to a common tangent line with the transfer position of the third photosensitive member, the transfer member is located on the opposite side to the intermediate transfer belt.

The image forming apparatus of the present invention has four or more toner image forming units, and the first photosensitive member is connected to a common straight line connecting the transfer positions of all photosensitive members other than the first photosensitive member. Is preferably located on the side of the intermediate transfer belt.

In the image forming apparatus of the present invention, the intermediate transfer belt is brought into pressure contact with a photosensitive member other than the first photosensitive member by a displacement means for locally displacing the intermediate transfer belt. It may be something. Also,
In the image forming apparatus of the present invention, the transfer position of the first photosensitive member, which is a pressure contact with the intermediate transfer belt,
The distance between the transfer position between the transfer position, which is a pressure contact with the intermediate transfer belt on the photoconductor, and the transfer position, which is the pressure contact between the transfer position on the second photoconductor and the intermediate transfer belt on the third photoconductor, is set. It is preferable that the distance is set to be the same as the distance between the transfer positions.

In the image forming apparatus of the present invention, a recording material transport belt including an endless belt moved along a substantially linear moving path in a transfer area where a toner image is transferred, and the recording material transport belt At least 3 arranged so as to be arranged along the substantially straight moving path in
Two toner image forming units, each of the toner image forming units has a photoreceptor on which a toner image is formed on a surface, and the recording material transport belt is provided at an end of the transfer area. It is provided so as to be in pressure contact with the first photoreceptor of the located first toner image forming unit, and is also in pressure contact with the photoreceptor of another toner image forming unit. And a second toner image forming unit adjacent to the first toner image forming unit.
The transfer position of the photoconductor is the third photoconductor adjacent to the transfer position of the first photoconductor opposite to the first toner image forming unit.
A common tangent line with the transfer position of the third photosensitive member according to the toner image forming unit.

The image forming apparatus of the present invention has four or more toner image forming units, and the first photosensitive member is connected to a common straight line connecting the transfer positions of all photosensitive members other than the first photosensitive member. Is preferably located on the recording material conveying belt side.

In the image forming apparatus according to the present invention, the recording material transport belt is provided for a photosensitive member other than the first photosensitive member.
The recording material conveying belt may be brought into a state of being pressed by a displacement means for locally displacing the recording material transport belt. Further, in the image forming apparatus of the present invention, the transfer position of the first photosensitive member, which is a pressure contact with the recording material transport belt, and the transfer position of the second photosensitive member, which is a pressure contact with the recording material transport belt, are defined. Between the transfer positions of the second photoconductor and the transfer position of the third photoconductor, which is a pressure contact with the recording material conveyance belt, is set to be the same as the distance between the transfer positions. Is preferred.

[0015]

According to the above-described image forming apparatus, when the intermediate transfer belt is in a state of being separated from all photosensitive members other than the first photosensitive member which is always in pressure contact, the intermediate transfer belt is adjacent to the first photosensitive member. Since the second photoconductor is located farther than the intermediate transfer belt, the separation distance between the second photoconductor and the intermediate transfer belt is inevitably large without being affected by other photoconductors. Therefore, contact between the intermediate transfer belt and the second photosensitive member can be reliably prevented.

Similarly, in an image forming apparatus provided with a toner image forming apparatus having a recording material transport belt instead of the intermediate transfer belt, a sufficient separation distance between the second photosensitive member and the recording material transport belt is similarly secured. can do.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. FIG. 1 is an explanatory diagram illustrating an example of the configuration of the image forming apparatus of the present invention. FIG. 2 is an explanatory view showing a state in which the intermediate transfer belt is pressed against all the photoconductors in the toner image forming apparatus provided in the image forming apparatus shown in FIG. 1, and FIG. FIG. 3 is an explanatory diagram illustrating a state in which an intermediate transfer belt is pressed against a first photosensitive member and is separated from all other photosensitive members in the toner image forming apparatus illustrated in FIG. 2.

The image forming apparatus in this example includes an image reading section 11 for optically scanning a document to read a document image to form image data, and a front surface based on the image data from the image reading section 11. Toner image forming units 21Y, 21M, 21C, 21K having photoconductors 31Y, 31M, 31C, 31K on which toner images are formed, and toner image forming units 21Y, 21M, 21C,
A toner image forming apparatus 20 having an intermediate transfer belt 22 composed of an endless belt for primarily transferring and carrying the toner image formed at 21K, and the intermediate transfer belt 2
2, a secondary transfer portion 12 for transferring the primary transfer toner image formed on the surface of the recording material, and a heating roller 13 for fixing the secondary transfer toner image transferred on the surface of the recording material
a fixing unit 13 having a pressure roller 13a and a pressure roller 13b, a transport mechanism for transporting the recording material, and a discharge port 15 for discharging the recording material on which the visible image has been formed. In FIG. 1, reference numeral 17 denotes a cleaning unit for an intermediate transfer belt;
8a, 18b and 18c are recording material cassettes.

In the toner image forming apparatus 20, for example, a downward portion of the intermediate transfer belt 22, which is an endless belt movably supported by a plurality of rollers 22a, 22b, 22c and 22d and circulating in the direction of the arrow in FIG. The toner image forming unit 2 is moved in the rotation direction of the intermediate transfer belt 22 along a substantially linear movement path through which the toner image is formed.
1Y, 21M, 21C and 21K are arranged in parallel.
Here, a yellow toner image is formed in the toner image forming unit 21Y, a magenta toner image is formed in the toner image forming unit 21M, and a cyan toner image is formed in the toner image forming unit 21C. In the toner image forming unit 21K, a black toner image is formed.

The toner image forming unit 21Y is provided with a photosensitive member 31Y that rotates so as to move in the forward direction (the direction of the arrow in FIG. 1) at the transfer position with the intermediate transfer belt 22, and the outer periphery of the photosensitive member 31Y. In the surface area, a charging unit 32Y for uniformly charging the photoreceptor 31Y by, for example, corona discharge using a grid and a corona discharge wire, and a uniformly charged photoreceptor 31Y along the rotation direction. An image exposure unit 33Y that forms an electrostatic charge image on the surface by irradiating a laser beam from a laser diode (not shown) based on image data of the image reading unit 11 to perform exposure, and a photoconductor. 31Y
Developing section 34Y for developing an electrostatic charge image formed on the surface of
A primary transfer unit 35Y that primarily transfers a toner image formed on the photoconductor 31Y to the intermediate transfer belt 22; a primary transfer unit 35Y that includes a pressing roller 36Y that presses the photoconductor 31Y via the intermediate transfer belt 22; A photoreceptor cleaning unit 37Y that removes toner adhered to the surface is provided. Further, other toner image forming units 21
Each of M, 21C and 21K has the same configuration as that of the toner image forming unit 21Y.

The pressing rollers 36Y, 36M, 3
6C is rotatably supported around a rotation axis P by L-shaped pressing members 38Y, 38M, 38C which move between an operation position and a non-operation position. As shown in FIG. 2, the pressing rollers 36Y, 36M, and 36C press the intermediate transfer belt 22 locally, thereby pressing the intermediate transfer belt 22 against the photoconductors 31Y, 31M, and 31C. From the state, as shown in FIG. 3, the intermediate transfer belt 22 is moved in a direction away from the intermediate transfer belt 22 so that
It is separated from 31M and 31C.

In this example, the pressing members 38Y, 3Y
Each of 8M and 38C is rotatably supported by a displacement means such as a common pressure release lever 39 movable in the vertical direction in FIG.
The pressing rollers 36Y, 36M, 36C are simultaneously rotated. Accordingly, the intermediate transfer belt 22 is in a state of being pressed against all the photoconductors 31Y, 31M, 31C, and 31K, and a state of being pressed against the photoconductor 31K and being in a state of being pressed against the other photoconductors 31Y and 31M. , 31C.

More specifically, as shown in FIG. 2, when the press release lever 39 is fixed at the uppermost position, each of the press rollers 36Y, 36M, 36C passes through the intermediate transfer belt 22. Corresponding photoconductors 31Y, 31M, 31
C, all the photoconductors 31Y, 31
The intermediate transfer belt 22 is in pressure contact with M, 31C, and 31K. In the image forming apparatus in this state, a color image is formed.

On the other hand, as shown in FIG. 3, when the pressure release lever, which is the displacement means 39, is moved downward, the pressure rollers 36Y, 36M, 36C are respectively driven by the corresponding photoconductors 31Y, 31M, As a result, the intermediate transfer belt 22 follows a substantially linear movement path positioned on a straight line connecting the roller 22b and the roller 22c. In a separated state. In the image forming apparatus in this state, a monochrome image is formed.

As described above, the intermediate transfer belt 22 is attached to the photosensitive member 31K located at the most downstream end (the end of the transfer area and the lower end in FIG. 1) of the downward portion of the intermediate transfer belt 22. On the other hand, it is in a pressure contact state, while the other photosensitive members 31Y, 31M, and 31C are displaced.

As shown in FIG. 4, in this example, the photosensitive members 31Y, 31M, 31C and 31K all have the same outer diameter, and the photosensitive members 31Y, 31M and 31C other than the photosensitive member 31K. Is located on one straight line L3, and the rotating shaft of the photoconductor 31K is located on the intermediate transfer belt 22 side (left side in FIG. 4) with respect to the straight line L3.

In FIG. 4, when the four photosensitive members are referred to as a first photosensitive member, a second photosensitive member,... In order from the bottom, the second photosensitive member 31C is a third photosensitive member 31M. And a common tangent line (straight line L2 in FIG. 4) between the transfer position (hereinafter, referred to as “third transfer position”) and the transfer position of the first photoconductor 31K (hereinafter, referred to as “first transfer position”). It is located on the opposite side (the right side in FIG. 4) of the intermediate transfer belt 22. Therefore, when the intermediate transfer belt 22 is in pressure contact with the first photoconductor 31K and is separated from the other photoconductors 31Y, 31M, and 31C, the pressure contact on the second photoconductor 31C is established. A certain second
An angle α formed by a straight line L1 connecting the transfer position and the first transfer position, which is a pressure contact point on the first photoconductor 31K, with a downward portion of the intermediate transfer belt 22 is a third angle, which is a pressure contact point on the third photoconductor 31M. A straight line L connecting the transfer position and the first transfer position
2 is necessarily larger than the angle β formed by the downward portion of the intermediate transfer belt 22.

As described above, the distance between the transfer positions between the first transfer position on the first photosensitive member 31K and the second transfer position on the second photosensitive member 31C is the second transfer position and the third photosensitive member 31M. It is preferable that the distance between the transfer positions with respect to the third transfer position is the same. The circumferential length of the intermediate transfer belt 22 is the same as that of the photoconductors 31Y, 31M, 31C, 3C.
It is preferably an integral multiple of the circumference of 1K.

The image forming process by the operation of the image forming apparatus as described above is as follows. In the toner image forming apparatus 20, as shown in FIG.
Intermediate transfer belt 2 for Y, 31M, 31C, 31K
When a color image is formed in a state where 2 is in a pressed state,
The image of the original is read by the image reading unit 11 to obtain image data. Based on the image data, each of the toner image forming units 21 in the toner image forming apparatus 20 is
Y, 21M, 21C, 21K image exposure units 33Y, 33
By performing exposure at M, 33C, and 33K, an electrostatic image is formed on the surface of each of the photoconductors 31Y, 31M, 31C, and 31K.
4Y, 34M, 34M, and 34K, toner images of different colors can be obtained. Then, the photoconductor 31Y,
The primary transfer toner images are superimposed by transferring the respective toner images formed on the surfaces of 31M, 31C and 31K to the surface of the intermediate transfer belt 22 circulating and moving in this order in the primary transfer units 35Y, 35M, 35C and 35K. It is formed. Here, the photoconductors 31Y, 31M, 31 after the primary transfer
C and 31K are photosensitive member cleaning units 37, respectively.
By passing through Y, 37M, 37C and 37K, the toner remaining on the surface is removed. On the other hand, for example, paper as a recording material is sent out from the recording material cassette 18a,
The sheet is conveyed toward the secondary transfer unit 12 in synchronization with the intermediate transfer belt 22.

The primary transfer toner image thus formed on the surface of the intermediate transfer belt 22 is secondarily transferred to the paper conveyed in the secondary transfer section 12. Thereafter, the paper onto which the secondary transfer toner image has been transferred is conveyed toward the fixing unit 13, where the toner image is heat-fixed, and a visible image corresponding to the image of the document is formed on the paper. After the paper on which the visible image is formed is discharged from the fixing unit 13, the paper is conveyed and discharged to the outside through the discharge port 15, whereby a color image is formed. Further, the toner remaining on the surface of the intermediate transfer belt 22 after the paper is separated is removed by passing through the intermediate transfer belt cleaning unit 17.

On the other hand, in the toner image forming apparatus 20, as shown in FIG. 3, when the intermediate transfer belt 22 is pressed against only the first photosensitive member 31K to form a monochrome image, the image reading section 11, a toner image forming apparatus 20 based on the image data from which the image of the original is read.
31 related to toner image forming unit 21K
A toner image is formed only on K, and a monochrome image is formed by performing the same image forming process as that for forming the color image described above, except that the primary transfer is performed in the primary transfer unit 35K.

According to the image forming apparatus having the above-described configuration, all the photoconductors 31Y, 31M, and 31K except for the first photoconductor 31K in which the intermediate transfer belt 22 is constantly pressed.
When the second photoconductor 31C is in a state of being separated from the first photoconductor 31K, the second photoconductor 31C adjacent to the first photoconductor 31K is located farther than the intermediate transfer belt 22. The separation distance from the transfer belt 22 is inevitably increased without being affected by other photoconductors, and therefore, the contact between the intermediate transfer belt 22 and the second photoconductor 31C can be reliably prevented.

In particular, the above-mentioned state is attained because the rotation axis of the first photosensitive member 31K is located on the intermediate transfer belt side with respect to one straight line L3 connecting all the rotation axes of the other photosensitive members 31Y, 31M and 31C. If is achieved, the first
While ensuring a sufficient separation distance for the photoconductors 31Y, 31M, and 31C other than the photoconductor 31K, each photoconductor 31Y, 31
M, widths H of specific areas required for transferring the toner images formed on the surfaces of 31C and 31K to the intermediate transfer belt 22
Can be reduced, whereby the size of the toner image forming apparatus 20 can be reduced. Actually, in a certain type of toner image forming apparatus, the width H can be reduced by 4 mm or more, thereby reducing the size of the image forming apparatus and increasing the degree of freedom in arranging each component in the image forming apparatus. It is possible to increase it.

In the image forming apparatus of the present invention, various changes can be made. For example, in a toner image forming apparatus, in order to reduce the size of the apparatus, the first photoconductor is preferably provided at a position closer to the intermediate transfer belt than any of the other photoconductors. As shown in FIG. 5, a configuration may be employed in which the photoconductor 31C as the second photoconductor is provided at a position separated from the intermediate transfer belt 22 from the other photoconductors 31Y, 31M, and 31K.

In the above, the image forming apparatus of the present invention
Although the case where the toner image forming apparatus having the intermediate transfer belt is provided has been described, the image forming apparatus is not limited to this. For example, a recording material on which a toner image is transferred instead of the intermediate transfer belt may be used. The image forming apparatus may be provided with a toner image forming apparatus having a recording material conveying belt formed of an endless belt for carrying. According to the image forming apparatus having the toner image forming apparatus having the recording material conveying belt, the distance between the photosensitive member adjacent to the photosensitive member in a state where the recording material conveying belt is constantly pressed against the recording material conveying belt is also used. Can be sufficiently secured.

[0036]

According to the image forming apparatus provided with the toner image forming apparatus having the intermediate transfer belt according to the present invention, the intermediate transfer belt is separated from all the photosensitive members other than the first photosensitive member which is always in pressure contact with the photosensitive member. In the state, the second photoconductor adjacent to the first photoconductor is located farther than the intermediate transfer belt, so that the separation distance between the second photoconductor and the intermediate transfer belt is different from that of the other photoconductor. It is inevitably large without being affected by the body, so that the contact between the intermediate transfer belt and the second photoconductor can be reliably prevented.

Similarly, in an image forming apparatus provided with a toner image forming apparatus having a recording material transport belt instead of the intermediate transfer belt, a sufficient separation distance between the second photosensitive member and the recording material transport belt is similarly secured. can do. The image forming apparatus of the present invention as described above can be suitably used as a color image forming apparatus.

[Brief description of the drawings]

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

FIG. 2 is an explanatory diagram showing a state in which an intermediate transfer belt is pressed against all photoconductors in the toner image forming apparatus provided in the image forming apparatus shown in FIG.

3 is an explanatory diagram illustrating a state in which the intermediate transfer belt is pressed against a first photosensitive member and is separated from all other photosensitive members in the toner image forming apparatus illustrated in FIG. 2;

FIG. 4 is an explanatory diagram showing an enlarged main part of the toner image forming apparatus shown in FIG. 2;

FIG. 5 is an explanatory diagram showing an enlarged main part of a toner image forming apparatus of another example of the configuration of the image forming apparatus of the present invention.

FIG. 6 is an explanatory schematic diagram showing an enlarged main part of a toner image forming apparatus in another example of the configuration of the conventional image forming apparatus.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 11 Image reading part 12 Secondary transfer part 13 Fixing part 13a Heat roller 13b Pressure roller 15 Discharge port 17 Intermediate transfer belt cleaning part 18a, 18b, 18c Recording material cassette 20 Toner image forming device 21Y, 21M, 21C, 21K Toner image Forming unit 22 Intermediate transfer belt 22a, 22b, 22c, 22d Roller 31Y, 31M, 31C, 31K Photoconductor 32Y, 32M, 32C, 32K Charging unit 33Y, 33M, 33C, 33K Image exposing unit 34Y, 34M, 34C, 34K Development Units 35Y, 35M, 35C, 35K Primary transfer units 36Y, 36M, 36C, 36K Pressure contact rollers 37Y, 37M, 37C, 37K Photoconductor cleaning units 38Y, 38M, 38C, 38K Pressing members 39 Displacement means P Rotating shaft 41Y , 41M, 41C 41K photoreceptor 43 intermediate transfer belt 45a, 45b roller 46Y, 46M, 46C, 46K press roller

Continued on the front page (72) Inventor Masahito Kunimatsu 2970 Ishikawa-cho, Hachioji-shi, Tokyo Konica Corporation F-term (reference) 2H030 AA04 AA06 AB02 AD05 AD16 BB42 BB44 BB46 BB53 BB71 2H200 FA08 GA12 GA23 GA47 HA02 HB12 HB22 HB41 JA01 JB06 JB10 JB22 JC03 JC09 LA03 LA06 LA15 LA17 LA24

Claims (8)

[Claims] An intermediate transfer belt including an endless belt that moves along a substantially linear movement path in a transfer area where a toner image is transferred, and an intermediate transfer belt that moves along the substantially linear movement path in the intermediate transfer belt. And at least three toner image forming units arranged side by side, wherein each of the toner image forming units has a photoreceptor on which a toner image is formed on a surface, and the intermediate transfer belt has It is provided in a state of being pressed against a first photoconductor related to a first toner image forming unit located at an end of the transfer area, and is in contact with a photoconductor related to another toner image forming unit. The second toner image forming unit adjacent to the first toner image forming unit and being displaced relatively between the separated state and the pressed state. The transfer position of the photoconductor is common to the transfer position of the first photoconductor and the transfer position of the third photoconductor of the third toner image forming unit adjacent to the opposite side of the first toner image forming unit. An image forming apparatus, which is located on a side opposite to the intermediate transfer belt with respect to a tangent line. 2. The image forming apparatus according to claim 1, further comprising at least four toner image forming units, wherein the first photosensitive member is located on the intermediate transfer belt side with respect to a common straight line connecting transfer positions of all photosensitive members other than the first photosensitive member. The image forming apparatus according to claim 1, wherein the image forming apparatus is located. 3. The intermediate transfer belt is brought into pressure contact with a photoreceptor other than the first photoreceptor by a displacement means for locally displacing the intermediate transfer belt. The image forming apparatus according to claim 1. 4. A distance between transfer positions between a transfer position of the first photosensitive member, which is a pressure contact with an intermediate transfer belt, and a transfer position of the second photosensitive member, which is a pressure contact with an intermediate transfer belt, is: The distance between the transfer positions between the transfer position of the second photosensitive member and the transfer position of the third photosensitive member that is a pressure contact with the intermediate transfer belt is set to be the same. The image forming apparatus according to claim 3. 5. A recording material transport belt including an endless belt moved along a substantially linear movement path in a transfer area where a toner image is transferred, and the substantially linear movement of the recording material transport belt. At least three toner image forming units arranged side by side along a road, wherein each of the toner image forming units has a photoreceptor having a surface on which a toner image is formed; The belt is provided in a state of being pressed against a first photosensitive member of the first toner image forming unit positioned at an end of the transfer area, and is provided with a photosensitive belt of another toner image forming unit. A second toner image forming unit adjacent to the first toner image forming unit, the second toner image forming unit being provided so as to be relatively displaced between a state separated from the body and a state pressed against the body; The transfer position of the second photosensitive member is the transfer position of the first photosensitive member, and the transfer position of the third photosensitive member of the third toner image forming unit adjacent to the opposite side of the first toner image forming unit. Wherein the common tangent line is located on the opposite side of the recording material conveying belt. 6. A recording material conveying belt side, comprising: four or more toner image forming units, wherein a first photoconductor is connected to a common straight line connecting transfer positions of all photoconductors other than the first photoconductor. The image forming apparatus according to claim 5, wherein: 7. The recording material conveying belt is brought into pressure contact with a photoreceptor other than the first photoreceptor by a displacement means for locally displacing the recording material conveying belt. The image forming apparatus according to claim 5. 8. A distance between transfer positions between a transfer position of the first photosensitive member, which is a pressure contact with the recording material transport belt, and a transfer position of the second photosensitive member, which is a pressure contact with the recording material transport belt. Is the transfer position of the second photoconductor,
8. The image forming apparatus according to claim 5, wherein a distance between the transfer positions of the photosensitive member and a transfer position which is a pressure contact with the recording material conveying belt is set to be the same. apparatus.