JP2003015497A - Color image forming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily prevent color slurring and flaw on a photoreceptor and an endless transfer belt without making the difference of linear velocity between the photoreceptor and the endless transfer belt. SOLUTION: In this color image forming device, a color image is formed by forming an image on one or several photoreceptors and temporarily transferring the image to the endless transfer belt or transferring it to a recording sheet held on the endless transfer belt, the device has a control means controlling a driving means for the photoreceptor and a driving means for the endless transfer belt independently and controlling the driving means for the endless transfer belt to be synchronized with a clock means set as reference.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention ensures the synchronization of driving between a photoconductor as an image carrier and an endless transfer belt for transferring a toner image thereof to prevent scratches due to misalignment between the photoconductor and the endless transfer belt. The present invention relates to a high-quality, high-durability color image forming apparatus that prevents image deformation such as generation and color shift.

[0002]

2. Description of the Related Art As a system of a color image forming apparatus, an image is formed on one or a plurality of photoconductors, and the image is intermediately transferred to an endless transfer belt, or a recording held on the endless transfer belt. There is one that forms a color image by transferring onto a sheet.

In such a color image forming apparatus, the photoconductor and the transfer belt come into contact and rotate. If the speeds of the photoconductor and the transfer belt do not match, color misregistration or scratches may occur between the photoconductor and the transfer belt, so it is desirable to match the speeds, but in reality, Since the belt also rotates with unevenness in rotation due to various factors, it is difficult to perfectly match it.

In Japanese Patent Laid-Open No. 8-314286, a braking means is provided in the driving means of the intermediate transfer belt, and when a speed difference occurs between the intermediate transfer belt and the photoconductor, the braking means slides the speed difference. Means for absorbing are disclosed.

Further, in Japanese Patent Laid-Open No. 11-352801, a one-way clutch is inserted in the driving means of the intermediate transfer belt to rotate the belt side slowly, and the speed of the photoconductor is set a little higher to endlessly release the one-way clutch. Means for tracking the speed of the pattern transfer belt are disclosed.

However, both methods have complicated mechanisms, and their reliability is questionable.

[0007]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned drawbacks of the prior art and prevents color misregistration caused by a difference in linear velocity between the photoconductor and the endless transfer belt.
It is an object of the present invention to provide a highly durable color image forming apparatus capable of obtaining high image quality by preventing scratches on the photoconductor and the intermediate transfer belt.

[0008]

This object is achieved by any of the following technical means (1) to (7).

(1) An image is formed on one or a plurality of photoconductors, and the image is intermediately transferred onto an endless transfer belt, or transferred onto a recording sheet held on the endless transfer belt. In the color image forming apparatus for forming a color image by the above, the driving means for the photoconductor and the driving means for the endless transfer belt are independent, and the driving means for the endless transfer belt is stored in advance in the image forming apparatus. A color image forming apparatus, which is controlled so as to be synchronized with a clock created based on numerical information regarding uneven rotation.

(2) An image is formed on one or a plurality of photoconductors, and the image is intermediately transferred onto an endless transfer belt, or transferred onto a recording sheet held on the endless transfer belt. In the color image forming apparatus for forming a color image, the driving means for the photoconductor and the driving means for the endless transfer belt are independent, and the driving means for the photoconductor is unique to each of the photoconductors. A color image forming apparatus, wherein the color image forming apparatus is controlled by a clock created on the basis of numerical information about rotation unevenness stored in advance in the image forming apparatus.

(3) An image is formed on one or a plurality of photoconductors, and the image is intermediately transferred onto an endless transfer belt, or transferred onto a recording sheet held on the endless transfer belt. In the color image forming apparatus for forming a color image, the driving means for the photoconductor and the driving means for the endless transfer belt are independent, and each of the driving means for the endless transfer belt and the photoconductor is independent. The color image forming apparatus is characterized in that the driving means of each of the photoconductors, which is unique, is controlled so as to be synchronized with a clock created based on numerical information regarding rotation unevenness stored in advance in the image forming apparatus. .

(4) The numerical information is attached in advance to the photosensitive member and / or the endless transfer belt as a parameter for uneven rotation, and is stored in the color image forming apparatus by using numerical input or automatic reading. The color image forming apparatus according to any one of items (1) to (3).

(5) The numerical information is provided with a parameter relating to rotation unevenness as a photoconductor unit accommodating the photoconductor and / or an endless transfer belt unit accommodating the endless transfer belt. The color image forming apparatus according to any one of (1) to (3), wherein the color image forming apparatus stores the color image by using input or automatic reading.

(6) The numerical information is a numerical value obtained by actually driving and measuring the photoconductor unit and / or the endless transfer belt unit. Color image forming apparatus.

(7) The numerical information is the photoconductor and / or
Alternatively, the distance from the reference position of the endless transfer belt and the information on the amount of speed unevenness of the photoconductor and / or the endless transfer belt there are information (1) to (6).
The color image forming apparatus according to any one of items.

(8) The numerical information is the photoconductor and / or
Alternatively, the distance from the reference position of the endless transfer belt and the period and amplitude information of the speed unevenness waveform of the photoreceptor and / or the endless transfer belt starting from the reference position are used (1) to ( 6. The color image forming apparatus according to any one of 6).

(9) The numerical information is the photoconductor and / or
Alternatively, it is based on the distance from the reference position of the endless transfer belt and the amplitude information of the speed unevenness of the photosensitive member and / or the endless transfer belt starting from the reference position in one revolution cycle (1) to The color image forming apparatus according to any one of (6).

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below. Note that the description in this section does not limit the technical scope of the claims or the meaning of terms. Further, the following affirmative description in the embodiments of the present invention shows the best mode, and does not limit the meaning or technical scope of the terms of the present invention.

FIG. 1 is a sectional view of a color image forming apparatus showing an embodiment of the present invention.

This color image forming apparatus is called a tandem type color image forming apparatus and comprises a plurality of sets of image forming sections 10Y, 10M, 10C and 10K, an endless transfer belt unit 7, a sheet feeding and conveying means and And a fixing unit 24. A document image reading device SC is arranged above the main body A of the image forming apparatus.

Image forming section 1 for forming a yellow image
0Y is a drum-shaped photoconductor 1Y as a first image carrier.
A charging means 2Y, an exposing means 3Y, a developing means 4Y, a primary transfer roller 5Y as a primary transfer means,
It has a cleaning means 6Y. The image forming unit 10M that forms a magenta image includes a drum-shaped photoreceptor 1M as a first image carrier, a charging unit 2M, an exposing unit 3M, a developing unit 4M, and a primary transfer roller 5 as a primary transfer unit.
M, and a cleaning means 6M. The image forming unit 10C that forms a cyan image includes a drum-shaped photoreceptor 1C as a first image carrier, a charging unit 2C, an exposing unit 3C, and
Developing means 4C, primary transfer roller 5 as primary transfer means
C, and a cleaning means 6C. The image forming unit 10K that forms a black image includes a drum-shaped photoreceptor 1K as a first image carrier, a charging unit 2K, an exposing unit 3K, a developing unit 4K, a primary transfer roller 5K as a primary transfer unit, and a cleaning unit. Have 6K.

The endless transfer belt unit 7 has a semiconductive endless belt-shaped endless transfer belt 70 as a second image carrier which is wound by a plurality of rollers and is rotatably supported.

Image forming units 10Y, 10M, 10C, 10
The image of each color formed by K is transferred to the primary transfer roller 5Y,
Endless transfer belt 7 that rotates by 5M, 5C, and 5K
0 is sequentially transferred to form a composite color image. The sheet P as a recording medium stored in the sheet cassette 20 is fed by the sheet feeding unit 21, passes through the plurality of intermediate rollers 22A, 22B, 22C, 22D, and the registration roller 23, and then is transferred to the secondary transfer unit 5A. The color image is conveyed and collectively transferred onto the paper P. The sheet P to which the color image is transferred is fixed by the fixing unit 24, sandwiched by the sheet discharge rollers 25, and placed on the sheet discharge tray 26 outside the apparatus.

On the other hand, after the color image is transferred onto the paper P by the secondary transfer means 5A, the residual toner is removed by the cleaning means 6A from the endless transfer belt 70 in which the paper P is separated by the curvature.

During the image forming process, the primary transfer roller 5K is constantly in pressure contact with the photoconductor 1K. Other primary transfer roller 5
Y, 5M and 5C are pressed against the corresponding photoconductors 1Y, 1M and 1C only when forming a color image.

The secondary transfer means 5A is provided with the endless transfer belt 7 only when the paper P passes through the secondary transfer means 5 and secondary transfer is performed.
Press to 0.

FIG. 2 is a perspective view showing a state where the housing 8 is pulled out from the apparatus main body A. FIG. 3 is a sectional view of the housing 8, and FIG. 4 is a perspective view of the housing 8.

The casing 8 is composed of the image forming units 10Y, 10M, 1
0C, 10K and an endless transfer belt unit 7.

Image forming units 10Y, 10M, 10C, 10
The Ks are arranged in a vertical column. Photoconductor 1Y, 1
An endless transfer belt unit 7 is arranged on the left side of M, 1C, 1K in the drawing. Endless transfer belt unit 7
Is an endless transfer belt 70 that is rotatable by winding rollers 71, 72, 73, 74, primary transfer rollers 5Y, 5M,
5C, 5K, and cleaning means 6A.

The housing 8 can be pulled out from the main body A. That is, the front door 101 of the main body A is opened, the housing 8 is grasped, and the front side is pulled out. The housing 8 is a support rail 8 on the left and right.
Guided by 2L and 82R, it slides and is pulled out forward. The image forming unit 10 is operated by pulling out the housing 8.
The Y, 10M, 10C and 10K and the endless transfer belt unit 7 are integrally pulled out from the main body A.

The support rail 82L on the left side of the casing 8 in the drawing is
It is disposed in the space above the fixing unit 24 on the left side of the endless transfer belt 70. The support rail 82R on the right side of the casing 8 in the figure is disposed near the lowermost developing unit 4K. The support rail 82R includes the developing means 4Y, 4M, 4
The C and 4K are arranged at positions where they do not interfere with the operation of attaching and detaching the C and 4K.

The right side of the photoreceptors 1Y, 1M, 1C and 1K of the casing 8 is surrounded by the developing means 4Y, 4M, 4C and 4K, and the lower side of the figure is charging means 2Y, 2M, 2C and 2K,
And the cleaning means 6Y, 6M, 6C, 6K and the like, and the left side of the drawing is surrounded by the endless transfer belt 70.

Among them, the photoconductor, the cleaning unit, the charging unit, etc. form one photoconductor unit, and the developing unit, the toner replenishing device, etc. form one developing unit.

The space above the photoconductor 1Y is shielded by a top plate 83 as an upper shield member fixed to the frame 81 of the housing 8. The bottom plate 84 as a lower shielding member fixed to the frame 81 of the housing 8 protects the endless transfer belt 70 at the time of attachment / detachment, and also serves as an upper guide plate for the paper transport path.

In FIG. 5, the endless transfer belt unit 7 and the developing units 4YU, 4MU, 4CU, 4KU from the housing 8 are shown.
6 is a perspective view of the endless transfer belt unit 7, and FIG. 7 is a perspective view of the housing 8. In FIG. 6, for convenience of explanation, the left half of the endless transfer belt 70 is removed to make it easier to see the inside of the endless transfer belt unit 7.

With the housing 8 pulled out from the main body A, the endless transfer belt unit 7 is slightly moved to the left in the drawing, and then the endless transfer belt unit 7 is gripped and pulled vertically upward. The positioning pins 75 planted on the upper portions of both side surfaces of the endless transfer belt unit 7 are moved leftward in the figure along the horizontal groove 85 formed in the housing 8, and then the vertical groove 8 is formed.
Moved vertically upwards along 6.

When the endless transfer belt unit 7 is pulled up, the endless transfer belt unit 7 is fixed by the positioning pin 7.
5 moves while being regulated by the horizontal groove 85 and the vertical groove 86, the endless transfer belt 70 contacts the member of the housing 8,
It will not be damaged.

On the inner surface side of the endless transfer belt 70, horizontally supported primary transfer rollers 5Y, 5M, 5C and 5K.
And pressure rollers 76Y, 76M, 76C and 76K are arranged in a column. Primary transfer roller 5Y and pressure roller 7
6Y, a lever 77Y that supports the primary transfer roller 5M and the pressure roller 76M, and a lever 77C that supports the primary transfer roller 5C and the pressure roller 76C.
And are simultaneously swung by the regulation plate 78 to press and release the endless transfer belt 70.

FIG. 8 shows four sets of photoconductor units 11Y and 1Y.
It is a perspective view of 1M, 11C, and 11K.

After the endless transfer belt unit 7 is removed from the housing 8, four sets of photoconductor units 11Y, 11M,
11C and 11K can be taken out respectively. The uppermost photoconductor unit 11Y includes a photoconductor 1Y and a charging unit 2.
Y, cleaning means 6Y. The second-stage photoconductor unit 11M includes a photoconductor 1M, a charging unit 2M, and a cleaning unit 6M. Third-stage photoconductor unit 11C
Is a photoconductor 1C, a charging unit 2C, a cleaning unit 6C
Consists of. The lowermost photoconductor unit 11K is the photoconductor 1
K, charging means 2K, and cleaning means 6K.

When the housing 8 is pulled out from the main body A, the photoconductors 1Y, 1 are driven from the drive shafts AYD, AMD, ACD, AKD which are cantilevered and fixedly supported inside the main body A, for driving the respective photoconductors.
M, 1C, 1K central holes 1YH, 1MH, 1CH, 1
KH is released, and each photoconductor unit 11Y, 11M, 11
C and 11K are mounted on the supporting bases 87Y, 87M, 87C and 87K, respectively.

In this state, the photoconductor unit 11Y can be slid on the support base 87Y and moved in the direction of the white arrow shown in FIG. 5 to take out the endless transfer belt unit 7 from the space after the detachment. it can. Photoconductor unit 11
Similarly, M, 11C, and 11K also have support bases 87M and 87, respectively.
It can be taken out from above C and 87K.

The developing unit 4YU mainly composed of the developing means 4Y facing the photoconductor unit 11Y, the developing unit 4MU mainly composed of the developing means 4M facing the photoconductor unit 11M, and the developing means 4 facing the photoconductor unit 11C.
C developing unit 4CU, photoconductor unit 1
The developing unit 4KU mainly including the developing unit 4K facing 1K can be taken out from a predetermined storage portion of the housing 8 in the direction of the white arrow shown on the right side in FIG.

When mounting these units, the housing 8 is slid along the support rails 82L and 82R,
It is mounted in the main body A, stopped at a predetermined position, and fixed by a lock lever (not shown). The operation detecting means of the casing 8 detects by a sensor that detects that the casing 8 is attached to the main body A at a predetermined position. Alternatively, the housing operation detecting means detects that the lock lever has completed a predetermined operation.

Although the seamless endless transfer belt 70 has been described in the above embodiment, the present invention is not limited to this, and the endless transfer belt such as a seamless endless belt is described. It is also applicable to.

The endless transfer belt 70 may have uneven thickness. When the thickness of the drive roller passes, the behavior is the same as when the diameter of the drive roller is changed. Therefore, when the thickness of the drive roller passage portion is large, the speed is fast, and when the thickness is thin, the speed is slow.

The thickness unevenness of the endless transfer belt 70 and the accompanying speed unevenness are shown in the diagrams of FIGS. 15 (a), 15 (b) and 15 (c). Reference position 126 of the endless transfer belt 70
As shown in the perspective view of FIG. 14, a reference mark 126A is attached to the sheet, and the time when that portion passes is shown by the arrow in the diagram of FIG.

Since the thickness unevenness is unique to each endless transfer belt 70 as shown in FIG. 15A, the speed unevenness due to the endless transfer belt 70 is also unique to the belt 70. 15 (b) is repeated in a cycle of one round of the belt 70. Reference mark 126A
The endless transfer belt speed data is stored in a memory, and as shown by the dotted line in FIG. 15C, the drive motor 72M is controlled by a control signal of a reverse signal that cancels it. Speed unevenness can be reduced.

The circuit diagram of FIG. 9 shows a schematic diagram of the control circuit of the drive motor 72M of the endless transfer belt 70. The control means executed by the color image forming apparatus of the present invention will be described using this.

Numerical information regarding the uneven rotation of the endless transfer belt 70 is stored in advance in the memory 123 in the CPU 120 of the color image forming apparatus. An arithmetic unit 121 of the CPU 120 performs arithmetic operation based on the numerical information, and a reference clock 122A as schematically shown in FIG.
By modulating the modulated clock 124A as a reverse pulse as shown in FIG. 12 to generate a control waveform for canceling the speed unevenness as shown by the dotted line in FIG. 15C. It can be output to the drive shaft 72D of the drive motor 72M of the endless transfer belt 70 to reduce speed unevenness due to thickness unevenness of the endless transfer belt 70.

The diagram of FIG. 16 shows an example of one embodiment of numerical information. Similar to FIG. 15, the time when the reference position mark 126A of the endless transfer belt 70 passes is indicated by an arrow in the diagram. Numerical information is the distance X1, X from the reference mark
2, X3 ... And speed differences ΔV1, ΔV2, ΔV3. It is possible to reduce the speed unevenness by creating a control signal shown by a dotted line that is corrected so as to cancel the speed unevenness based on the defined points.

The diagram of FIG. 17 shows another embodiment of numerical information. Similar to FIG. 15, the time when the reference position mark 126A of the endless transfer belt 70 passes is indicated by an arrow in the diagram.

Numerical information includes the distances Z1, Z2, Z3 ... From the reference mark to each waveform reference position and the periods T1, T of each waveform.
2, T3 ... And amplitudes Y1, Y2, Y3. Based on the waveform of (a) synthesized by adding the waveforms of (b), (c), and (d) such as sine wave and triangle wave having respective periods and amplitudes with each reference position as a start point, By generating the control signal of the reverse pulse that cancels out, the speed unevenness can be reduced.

The diagram of FIG. 18 shows another embodiment of numerical information. Similar to FIG. 15, the time when the reference position mark 126A of the endless transfer belt 70 passes is indicated by an arrow in the diagram.

Only two pieces of numerical information are the distance Z1 from the reference mark 126A to the waveform reference position and the waveform amplitude Y1. This will be described below.

In FIG. 17, let us consider the case where the thickness unevenness has a profile of a trigonometric function and the cycle is one round, 1/2 round, and 1/4 round of the endless transfer belt 70. If the absolute values of uneven thickness are the same, the positional deviation due to uneven thickness is 1
In the case of a circle, the position is four times as large as in the case of one quarter, and the positional deviation is a color deviation, so that the color deviation is also four times, and the thickness unevenness of one cycle of the belt 70 is the most color deviation. Will have a great impact on.

The above-described embodiment of FIG. 18 cancels out only the rotation unevenness of the one-cycle cycle of the belt. When the ratio of the one-cycle cycle to the frequency component of the thickness unevenness of the endless transfer belt 70 is large. Can provide a sufficient effect of reducing color misregistration.

The above numerical information is attached to the endless transfer belt 70 in advance and can be stored in the memory 123 of the CPU 120 in the color image forming apparatus by inputting numerical values or automatically reading.

Once the numerical information is transferred to the endless transfer belt unit 7 in which the endless transfer belt 70 is housed, it is stored in the memory 123 by inputting numerical values or by automatic reading using a bar code or the like. You can also
The work when replacing the unit can be simplified.

The numerical information may be calculated by measuring the thickness unevenness, or the rotation unevenness may be found by actually driving the endless transfer belt unit 7.

Next, another invention will be described with reference to the circuit diagram of FIG. Each of the photoconductors may have uneven rotation due to the shake of the surface with respect to the center of the drive shaft. FIG. 10 shows a control unit for canceling the rotation unevenness by holding numerical information in the memory in order to improve the rotation unevenness, as in the case of the endless transfer belt 70.

Since the concept is the same as that of the endless transfer belt 70, detailed description will be omitted. Further, as shown in the circuit diagram of FIG. 11, the control for canceling the rotation unevenness of both the rotation unevenness of the endless transfer belt 70 and the rotation unevenness of the photosensitive member is performed. By doing so, the difference in linear velocity between the photoconductor and the endless transfer belt is further eliminated, and high-quality color image formation can be stably performed.

[0063]

According to the present invention, there is no difference in the linear velocity between the photoconductor and the endless transfer belt, and color deviation and scratches on the photoconductor and the endless transfer belt can be easily prevented.

[Brief description of drawings]

FIG. 1 is a cross-sectional configuration diagram of a color image forming apparatus showing an example of an embodiment of the present invention.

FIG. 2 is a perspective view showing a state in which a housing is pulled out from a main body of the image forming apparatus.

FIG. 3 is a cross-sectional view of a housing that houses an image forming unit.

FIG. 4 is a perspective view of a housing containing an image forming unit.

FIG. 5 is an exploded cross-sectional view of a housing in which a photoconductor unit is mounted, an endless transfer belt unit, and a developing unit.

FIG. 6 is a perspective view of an endless transfer belt unit.

FIG. 7 is a perspective view of a housing.

FIG. 8 is a perspective view of four photoconductor units.

FIG. 9 is a circuit diagram of drive control of an endless transfer belt.

FIG. 10 is a circuit diagram of rotation drive control of each photoconductor.

FIG. 11 is a circuit diagram of drive control of each photoconductor and an endless transfer belt.

FIG. 12 is a schematic diagram showing an example of modulated clock pulses.

FIG. 13 is a schematic diagram showing an example of a pulse of a reference clock.

FIG. 14 is a perspective view showing a reference mark of an endless transfer belt.

15A is a diagram showing a periodicity of thickness unevenness of an endless transfer belt, FIG. 15B is a diagram showing a periodicity of speed unevenness of an endless transfer belt, and FIG. FIG. 7 is a diagram showing speed unevenness of an endless transfer belt and periodicity of a control waveform for canceling it.

FIG. 16 is a graph showing the periodicity of speed unevenness of the endless transfer belt and a diagram for correcting it.

FIG. 17 is a diagram showing a waveform obtained by adding and combining sine curve waves having respective periods and respective amplitudes, and a waveform of a control signal based on the waveform.

FIG. 18 is a diagram showing a sine curve of one period component and a control curve of an opposite phase thereof based on numerical information of the distance from the reference mark to the waveform reference position and the amplitude.

[Explanation of symbols]

1Y, 1M, 1C, 1K Photoconductors 1YH, 1MH, 1CH, 1KH Central holes 2Y, 2M, 2C, 2K of photoconductors Charging means 3Y, 3M, 3C, 3K Exposure means 4Y, 4M, 4C, 4K Developing means 4YU, 4MU, 4CU, 4KU Developing unit 5A Secondary transfer means 5Y, 5M, 5C, 5K Primary transfer rollers 6A, 6Y, 6M, 6C, 6K Cleaning means 7 Endless transfer belt unit 8 Casing 10Y, 10M, 10C, 10K Image Forming portions 11Y, 11M, 11C, 11K Photoreceptor units 13, 71 Drive shaft 70 Endless transfer belt 81 Frames 82L, 82R Support rails 83 Top plate 84 Bottom plate 101 Front door 120 CPU 121 Computing device 122, 122A Reference clock 123 Memory 124 , 124A Modulated clock 126, 129 Position of uneven rotation from the reference position Deviation information 126A reference marks 127 and 128 the body of the amplitude information A image forming apparatus uneven rotation AYD, AMD, ACD, AKD, 72D drive shaft

Front page continuation (51) Int.Cl. ⁷ Identification code FI theme code (reference) G03G 21/00 350 G03G 21/00 372 F term (reference) 2H027 DA17 DA20 DA41 EC07 EC09 EC10 ED02 ED24 EE01 EE02 EE03 EE04 EE08 EF09 FA28 2H030 AA01 AB02 AD05 AD17 BB23 BB42 BB44 BB46 BB54 BB56 BB63 2H035 CA07 CB01 CG01 CG03 2H200 FA04 GA12 GA23 GA29 GA30 GA34 GA44 GA47 GB12 HA03 HA12 HB03 HB12 J02 JA29 JA30 JB06 J19 J20 JB25 JB49 J20 JB25 JB49 J20 J20

Claims (9)

[Claims] 1. An image is formed on one or a plurality of photoconductors and the image is intermediately transferred onto an endless transfer belt, or
Alternatively, in a color image forming apparatus that forms a color image by transferring onto a recording sheet held on the endless transfer belt, the driving means for the photoconductor and the driving means for the endless transfer belt are independent of each other. A color image forming apparatus, characterized in that the driving means for the endless transfer belt is controlled so as to be synchronized with a clock generated based on numerical information regarding rotational unevenness stored in advance in the image forming apparatus. 2. An image is formed on one or a plurality of photoconductors, and the image is intermediately transferred onto an endless transfer belt, or
Alternatively, in a color image forming apparatus that forms a color image by transferring onto a recording sheet held on the endless transfer belt, the driving means for the photoconductor and the driving means for the endless transfer belt are independent of each other. Color image formation, characterized in that the driving means of the photoconductor is controlled by a clock which is unique to each of the photoconductors and which is created based on numerical information regarding rotation unevenness stored in advance in the image forming apparatus. apparatus. 3. An image is formed on one or a plurality of photoconductors, and the image is intermediately transferred onto an endless transfer belt, or
Alternatively, in a color image forming apparatus that forms a color image by transferring onto a recording sheet held on the endless transfer belt, the driving means for the photoconductor and the driving means for the endless transfer belt are independent of each other. The drive means for the endless transfer belt and the drive means for each photoconductor, which is unique to each of the photoconductors, is a clock created based on numerical information about rotation unevenness stored in advance in the image forming apparatus. A color image forming apparatus, which is controlled so as to be synchronized with the color image forming apparatus. 4. The numerical information is previously attached to the photoconductor and / or the endless transfer belt as a parameter for rotation unevenness, and is stored in the color image forming apparatus by using numerical input or automatic reading. The color image forming apparatus according to claim 1, wherein the color image forming apparatus is a color image forming apparatus. 5. The numerical information is provided with a parameter relating to rotation unevenness as a photoconductor unit accommodating the photoconductor and / or an endless transfer belt unit accommodating the endless transfer belt, and the value is input as a numerical value. 4. The color image forming apparatus according to claim 1, wherein the color image forming apparatus stores the color image in the color image forming apparatus by using automatic reading. 6. The color image according to claim 5, wherein the numerical information is a numerical value obtained by actually driving and measuring the photoconductor unit and / or the endless transfer belt unit. Forming equipment. 7. The numerical information is based on information on a distance from a reference position of the photoconductor and / or the endless transfer belt and an amount of speed unevenness of the photoconductor and / or the endless transfer belt there. The color image forming apparatus according to claim 1, wherein the color image forming apparatus is a color image forming apparatus. 8. The numerical information is a distance from a reference position of the photoconductor and / or the endless transfer belt and a period of a speed unevenness waveform of the photoconductor and / or the endless transfer belt starting from the reference position, 7. The color image forming apparatus according to claim 1, wherein the color image forming apparatus is based on amplitude information. 9. The numerical information is a distance from a reference position of the photoconductor and / or the endless transfer belt and 1 of the photoconductor and / or the endless transfer belt starting from the reference position.
The color image forming apparatus according to any one of claims 1 to 6, wherein the color image forming apparatus is based on amplitude information of speed unevenness in a circumferential cycle.