JP5915290B2 - Image forming apparatus, image forming control method, and image forming control program - Google Patents

Description

  The present invention relates to a technique for controlling an image forming apparatus.

  The tandem color image forming apparatus is configured such that a toner image is primarily transferred from each color photoconductor to an intermediate transfer belt, and the toner image is secondarily transferred from the intermediate transfer belt to a sheet. Therefore, if the intermediate transfer belt is contaminated with toner, the toner adheres to the sheet, which deteriorates the image quality.

  For this reason, there is known a technique for preventing the stain by cleaning the intermediate transfer belt after printing so that the stain does not occur on the intermediate transfer belt. Patent Document 1 discloses a cleaning device for an intermediate transfer belt (configured by a cleaning brush, a charging brush, a collection roller, and a scraper) on the assumption that a photoconductor is disposed below the intermediate transfer belt.

  There is also known a technique for cleaning dirt remaining on the intermediate transfer belt and dirt remaining on the edge portion of the cleaning blade in contact with the intermediate transfer belt before starting printing. In Patent Document 2, on the assumption that a photoconductor is disposed below the intermediate transfer belt, dirt is removed for the purpose of avoiding abnormal images due to dirt remaining in the contact portion between the intermediate transfer belt and the cleaning blade. It is disclosed that the intermediate transfer belt is idly rotated until the contact position between the photoreceptor and the intermediate transfer belt is exceeded.

  By the way, there is a case where the photoconductor is disposed on the upper side of the intermediate transfer belt due to the layout of the units in the image forming apparatus. In this case, in addition to the above-mentioned toner contamination, the intermediate transfer belt is also contaminated with toner due to the photoreceptor cleaning mechanism. In other words, a cleaning blade is provided in contact with the photoconductor to remove residual toner after the primary transfer from the photoconductor. However, when printing is started, the toner accumulates between the photoconductor and the cleaning blade. The toner may fall on the intermediate transfer belt.

  Since the techniques described in Patent Documents 1 and 2 described above are based on the premise that the photoconductor is disposed below the intermediate transfer belt, the toner accumulated between the photoconductor and the cleaning blade is dropped. The generated dirt cannot be avoided.

  The present invention has been proposed in view of the above-described conventional problems. The object of the present invention is to collect between the photosensitive member and the cleaning blade when the photosensitive member is disposed on the upper side of the intermediate transfer belt. An object of the present invention is to provide an image forming apparatus capable of preventing smearing of an intermediate transfer belt resulting from toner falling on the intermediate transfer belt and improving printing quality.

In order to solve the above problems, in the present invention, a plurality of photoconductors are installed on the upper side of the intermediate transfer belt along the driving direction of the intermediate transfer belt, and the toner remaining on the photoconductor is removed. An image forming apparatus including a cleaning blade, the storage unit storing print information of the last print of the previous time, the print information of the last print stored in the storage unit, and the printing of the current first sheet On the basis of the print information of the previous print, it is determined whether or not the toner drop at the end of the previous print affects the first print of this time. At the start of printing, after driving the photoconductor and the intermediate transfer belt, a predetermined distance determined by the distance between the uppermost photoconductor of the last printing of the previous time and the uppermost photoconductor of the first printing of this time Start imaging after a delay And a control means, said storage means stores the uppermost stream photosensitive body information used at the time of printing, the control means, the most upstream photosensitive member used in the last printing of last time stored in the storage means However, it is determined whether or not it is upstream from the most upstream photoconductor used for the first sheet of the current printing, and if it is upstream, the delay is performed .
Further, the image forming apparatus includes a plurality of photoconductors disposed on an upper side of the intermediate transfer belt along a driving direction of the intermediate transfer belt, and includes a cleaning blade for removing toner remaining on the photoconductor. Storage means for storing the print information of the last print of the last print, the print information of the last print of the last time stored in the storage means and the print information of the first print of the current time, and It is determined whether or not the toner drop affects the current printing of the first sheet. If it is determined that there is an influence, at the start of printing the first sheet of the current printing, the photosensitive member and the intermediate transfer belt are removed. Control means for starting image formation after a predetermined delay determined by the distance between the most upstream photoconductor of the last printing of the previous time and the most upstream photoconductor of the first printing of this time after driving; The most downstream photoconductor is K color In the case of a certain arrangement, the storage unit stores information on a print mode used at the time of printing, and the control unit stores the print mode of the last print stored in the storage unit as color printing, and When the first print mode of the current printing is monochrome printing, the delay is performed.
Further, the image forming apparatus includes a plurality of photoconductors disposed on an upper side of the intermediate transfer belt along a driving direction of the intermediate transfer belt, and includes a cleaning blade for removing toner remaining on the photoconductor. Storage means for storing the print information of the last print of the last print, the print information of the last print of the last time stored in the storage means and the print information of the first print of the current time, and It is determined whether or not the toner drop affects the current printing of the first sheet. If it is determined that there is an influence, at the start of printing the first sheet of the current printing, the photosensitive member and the intermediate transfer belt are removed. Control means for starting image formation after a predetermined delay determined by the distance between the most upstream photoconductor of the last printing of the previous time and the most upstream photoconductor of the first printing of this time after driving; The most downstream photoconductor is K color In the case of a certain arrangement, the storage unit stores information on a print mode used at the time of printing, and the control unit stores the print mode of the last print stored in the storage unit as color printing, and When the first print mode of the current printing is monochrome printing, the delay is performed.

In the image forming apparatus , the image forming control method, and the image forming control program of the present invention, when the photosensitive member is disposed on the upper side of the intermediate transfer belt, the toner accumulated between the photosensitive member and the cleaning blade is transferred to the intermediate transfer belt. It is possible to prevent the intermediate transfer belt from being soiled due to falling on the belt by a delay at the start of printing, and to improve the printing quality.

1 is a diagram illustrating a hardware configuration example of an image forming apparatus according to an embodiment of the present invention. FIG. 3 is a diagram illustrating a software configuration example of an image forming apparatus according to an embodiment of the present invention. FIG. 4 is a diagram illustrating an example of arrangement of photosensitive members with respect to an intermediate transfer belt. FIG. 6 is a diagram illustrating a state of toner falling on an intermediate transfer belt. FIG. 6 is a diagram illustrating an example of an influence of toner dropping on a toner image on an intermediate transfer belt. It is a flowchart which shows the 1st process example. It is a figure which shows the example of the use photoreceptor by the printing mode of the last printing and this printing. FIG. 10 is a diagram illustrating an example in which the influence of dropped toner is avoided by delay. It is a flowchart which shows the 2nd process example. It is a figure which shows the example of judgment of the presence or absence of the delay by the printing mode of the last printing and this printing. It is a flowchart which shows the 3rd processing example. It is a figure which shows the example of the judgment method of the condition where the generation | occurrence | production probability of a toner fall is high.

  Hereinafter, preferred embodiments of the present invention will be described.

<Device configuration>
FIG. 1 is a diagram illustrating a hardware configuration example of an image forming apparatus 1 according to an embodiment of the present invention.

  In FIG. 1, a scanner unit 101 is provided on the upper part of the image forming apparatus 1. Inside the main body, photosensitive members 102Y, 102M, 102C, and 102K are arranged in the order of YMCK (Yellow, Magenta, Cyan, blacK) from the right side on the upper side of the intermediate transfer belt 107, and each photosensitive member 102 is charged. A device 103, an exposure device 104, a developing device 105, and a cleaning blade 106 are provided (only K color is shown). Note that the arrangement of the colors of the photoconductor 102 is not limited to the illustrated example.

  A paper feed tray 108 is provided in the lower part of the image forming apparatus 1. The fed paper is opposed to the intermediate transfer belt 107 by the secondary transfer roller 109, and then discharged through the fixing unit 110. It is like that.

  FIG. 2 is a diagram showing a software configuration example of the image forming apparatus 1 according to the embodiment of the present invention.

  In FIG. 2, a central processing control unit 112, a nonvolatile storage area management unit 113, a temperature / humidity sensor detection control unit 114, an image formation control unit 115, a fixing control unit 119, and a paper conveyance control unit 120 are connected to the print control unit 111. ing. The image forming control unit 115 includes a photoconductor control unit 116, a writing (charging / exposure / development) control unit 117, and an intermediate transfer belt control unit 118.

<Dropping toner>
FIG. 3 shows only the portions related to the intermediate transfer belt 107 and the photosensitive member 102 extracted from the components of the image forming apparatus 1.

  Photoconductors 102Y, 102M, 102C, and 102K are arranged above the intermediate transfer belt 107 in the order of YMCK from the upstream in the rotation direction (drive direction) of the intermediate transfer belt 107. Of the components around the photoconductor 102, only the developing unit 105 and the cleaning blade 106 are shown as being involved in toner dropping.

  FIG. 4 is a diagram showing the state of toner falling on the intermediate transfer belt 107, and focuses on the Y-color photoconductor 102Y.

  In FIG. 4A, at the time of printing, the photosensitive member 102Y rotates in the clockwise direction in the drawing, and Y toner adheres to the surface of the photosensitive member 102Y by the developing roller of the developing unit 105Y. Most of the toner adhering to the surface of the photoreceptor 102Y is transferred (primary transfer) to the intermediate transfer belt 107, but the toner that has not been completely transferred is removed from the surface of the photoreceptor 102Y by the subsequent cleaning blade 106Y. The When many printings are repeated, the toner removed by the cleaning is accumulated in the gap between the cleaning blade 106Y and the photosensitive member 102Y, so that the cleaning property is deteriorated.

  In order to prevent deterioration in image quality due to deterioration in cleaning performance, the photosensitive member 102 is temporarily moved by the photosensitive member control unit 116 of the image forming control unit 115 under the control of the printing control unit 111 (FIG. 2) at the end of printing. The toner accumulated in the gap between the cleaning blade 106 and the photosensitive member 102 is removed.

  Therefore, during this reverse rotation, as shown in FIG. 4B, the accumulated toner T falls on the intermediate transfer belt 107 from between the photosensitive member 102Y disposed above the intermediate transfer belt 107 and the cleaning blade 106Y. Will do.

  FIG. 5A shows a state where the toner has fallen on the intermediate transfer belt 107 at the end of full color printing. That is, it is assumed that the toner T1 has fallen under the photoreceptor 102Y, the toner T2 has fallen under the photoreceptor 102M, and the toner T3 has fallen under the photoreceptor 102C.

  In this state, when monochrome printing starts continuously, the photosensitive member 102K transfers the developed toner image onto the intermediate transfer belt 107, and as shown in FIG. Since T1, T2, and T3 overlap with the image to be printed, the image is transferred to the paper with a stain on the printed image. Since the toner drop is caused by the reverse rotation at the end of printing, it affects only the first sheet of continuous printing and does not affect the second and subsequent sheets.

<First processing example>
FIG. 6 is a flowchart illustrating a first processing example by the print control unit 111 of the image forming apparatus 1 described above. FIG. 6A shows initial processing immediately after power-on, and FIG. 6B shows processing at the time of printing.

  6A, when the power of the image forming apparatus 1 is turned on (step S101), the print control unit 111 initializes information used as print delay determination information, which will be described later. "" Photosensitive member arranged on the most downstream side "is set (step S102), and initialization is completed (step S103).

  In the arrangement of the photoconductors 102 shown in FIGS. 1 and 3, the “photoconductor arranged at the most downstream position” is the K-color photoconductor 102K. The “most downstream photoconductor” is set to “the most downstream photoconductor” because the toner drop is caused by the reverse rotation at the end of printing, and the toner drop occurs when the power is turned on. Therefore, it is not determined that the printing delay is performed on the first sheet of the first printing.

  In FIG. 6B, when printing is started (step S104), the print control unit 111 determines whether or not printing is for the first sheet (step S105).

  If it is determined that the printing is for the first sheet (Yes in step S105), the print control unit 111 then determines that the most upstream use photosensitive member of the previous printing is upstream of the most upstream use photosensitive member of the current printing. Is determined (step S106).

  FIG. 7 is a diagram showing an example of the photoconductor used in the printing mode of the previous printing and the current printing. It should be noted that immediately after the power is turned on, as described with reference to FIG. 6A, “the photoconductor arranged on the most downstream side” is set in “the most used photoconductor”, and therefore FIG. 7 is not applied.

  When the previous time is full color and the current time is monochrome, as shown in FIG. 7A, the most upstream use photosensitive member of the previous printing is Y color, and the most upstream use photosensitive member of the current printing is K color. Yes, it is determined that the most upstream use photosensitive member of the previous printing is upstream of the most upstream use photosensitive member of the current printing.

  When the previous color is KM and the current time is monochrome, as shown in FIG. 7B, the most upstream use photoconductor of the previous printing is M color, and the most upstream use photoconductor of this printing is It is determined that the uppermost used photoconductor of the previous printing is upstream of the uppermost used photoconductor of the current printing.

  If the previous color is full color and the current color is C, as shown in FIG. 7C, the most upstream photosensitive material used in the previous printing is Y, and the most upstream photosensitive material in the current printing is C. It is a color, and it is determined that the most upstream use photoreceptor for the previous printing is upstream from the most upstream use photoreceptor for the current printing.

  Returning to FIG. 6B, when it is determined that the most upstream use photosensitive member of the previous printing is upstream from the most upstream use photosensitive member of the current printing (Yes in step S106), the print control unit 111 Assuming that there is a toner drop, the toner drop position on the intermediate transfer belt corresponding to the most upstream use photosensitive member of the previous printing is delayed until it passes the position of the most upstream use photosensitive member of the current printing (step S107). . The amount of delay can be calculated from the distance between the most upstream photoreceptor used for the previous printing and the most upstream photoreceptor used for the current printing, and the speed of the intermediate transfer belt.

  Further, when it is determined that the printing is not the first sheet (No in step S105), when it is determined that the most upstream photosensitive member used in the previous printing is not upstream of the upstream photosensitive member used in the current printing (step S106). No) and after the delay (step S107), the print control unit 111 sets “upstream most used photosensitive member for current printing” as “upstream most used photosensitive member” as information update (step S107). S108). “The most upstream use photoreceptor for the current printing” is the most upstream use photoreceptor in the last print when printing is performed in a different print mode in the print job.

  Next, the print control unit 111 starts image writing (step S109) and ends printing (step S110).

  FIG. 8 is a diagram illustrating an example in which the influence of the dropped toner is avoided by delay by the above-described processing, and illustrates a case where monochrome printing is performed following full color printing.

  FIG. 8A shows a state in which toner has fallen on the intermediate transfer belt 107 at the end of full color printing. That is, it is assumed that the toner T1 has fallen under the photoreceptor 102Y, the toner T2 has fallen under the photoreceptor 102M, and the toner T3 has fallen under the photoreceptor 102C.

  In this state, when monochrome printing is started continuously, the photoreceptor 102Y that is the most upstream use photoreceptor of the previous full color printing is upstream of the photoreceptor 102K that is the most upstream use photoreceptor of the current monochrome printing. Therefore, assuming that there is a toner drop, the position of the toner T1 on the intermediate transfer belt 107 corresponding to the most upstream photoreceptor 102Y of the previous full color printing passes the position of the most upstream photoreceptor 102K of the current printing. Delay until

  After the delay, the photoreceptor 102K transfers the developed toner image onto the intermediate transfer belt 107 as shown in FIG. 8B. Accordingly, as shown in FIG. 8C, the toner image by the photosensitive member 102K does not overlap with the dropped toners T1, T2, and T3, and the paper is not stained.

<Second processing example>
FIG. 9 is a flowchart illustrating a second processing example by the print control unit 111 of the image forming apparatus 1 described above. In this processing example, as shown in FIGS. 1 and 3, it is assumed that the K-color photoconductor 102K is disposed on the most downstream side, and “print mode” is used as information serving as print delay determination information. Yes.

  In FIG. 9A, when the image forming apparatus 1 is powered on (step S201), the print control unit 111 sets “monochrome printing” to “print mode” as initialization of information that is print delay determination information. Is set (step S202), and the initialization is completed (step S203). “Monochrome printing” is set as the “printing mode” in the case of the arrangement of the photosensitive member 102 shown in FIGS. 1 and 3, regardless of the current printing mode, if the previous printing is monochrome printing, the printing delay This is because it is not determined that the printing delay is performed, and it is not determined that the printing delay is performed on the first sheet of the first printing after the power is turned on, which does not need to consider the printing delay.

  In FIG. 9B, when printing is started (step S204), the print control unit 111 determines whether or not printing is for the first sheet (step S205).

  If it is determined that the printing is for the first sheet (Yes in step S205), then the print control unit 111 determines that the previous printing mode is color printing (full color, single color, two colors) and the current printing mode is It is determined whether or not monochrome printing is performed (step S206). Note that, in the case where the current printing is not monochrome printing, it is possible to determine whether or not to delay based on the combination of the previous printing mode and the current printing mode as shown in FIG. In this case, the print mode combinations indicated by * include cases where there is no need for delay depending on the colors actually used for single-color or two-color printing. Is valid.

  Returning to FIG. 9B, when it is determined that the previous print mode is color printing and the current print mode is monochrome printing (Yes in step S206), the print control unit 111 determines that there is a toner drop. The toner fall position on the intermediate transfer belt corresponding to the most upstream use photosensitive member of the previous printing is delayed until it passes the position of the most upstream use photosensitive member of the current printing (step S207). The amount of delay can be calculated from the distance between the most upstream photoreceptor used in the previous printing and the most downstream photoreceptor used in the current monochrome printing, and the speed of the intermediate transfer belt.

  Also, when it is determined that the printing is not the first sheet (No in step S205), when it is determined that the previous printing mode is color printing and the current printing mode is not monochrome printing (No in step S206), and After the delay (step S207), the print control unit 111 sets “print mode of current printing” to “print mode” as information update (step S208). “Print mode of current print” is a print mode in the last print when printing is performed in a different print mode in a print job.

  Next, the print control unit 111 starts image writing (step S209) and ends printing (step S210).

<Third processing example>
FIG. 11 is a flowchart showing a third processing example performed by the print control unit 111 of the image forming apparatus 1 described above. In addition to the determination, it is determined whether or not the toner drop occurrence probability is high. When delaying from the positional relationship between the previous printing and the current printing photoconductor, if the stain passes every time, the start of printing of the first sheet is delayed even when there is actually no fallen toner. There's a problem. In order to avoid this and limit it to only when necessary, a situation in which there is a high probability of falling toner is predicted to determine whether or not to implement a printing delay.

  In FIG. 11A, when the power of the image forming apparatus 1 is turned on (step S301), the print control unit 111 sets “the most used photoconductor” as the initialization of the information that is the determination information of the print delay. “Photoconductor disposed at the most downstream side” is set (step S302), and initialization is completed (step S303).

  In FIG. 11B, when printing is started (step S304), the print control unit 111 determines whether or not printing is for the first sheet (step S305).

  If it is determined that the printing is for the first sheet (Yes in step S305), the print control unit 111 then determines that the most upstream use photoconductor of the previous printing is upstream of the most upstream use photoconductor of the current printing. It is determined whether or not (step S306).

  When it is determined that the most upstream use photosensitive member of the previous printing is upstream of the most upstream use photosensitive member of the current printing (Yes in step S306), the print control unit 111 has a high probability of toner dropping. It is determined whether or not (step S307).

  FIG. 12 is a diagram illustrating an example of a determination method for a situation where the probability of toner dropping is high. For example, the probability of toner dropping due to the curing of the cleaning blade in a low temperature / low humidity environment can be determined from the measured temperature and humidity. In this case, in FIG. 2, the temperature / humidity information (measured values of the temperature sensor and the humidity sensor) acquired by the temperature / humidity sensor detection control unit 114 under the control of the print control unit 111 is displayed by the nonvolatile storage area management unit 113. Write in the non-volatile storage area. Then, when determining whether or not the toner drop occurrence probability is high, the temperature / humidity information is read from the non-volatile storage area and compared with a predetermined threshold value. Determine if the situation is high.

  In addition, the probability of toner drop due to an increase in the amount of cleaning toner due to continuous color (full color, single color, two colors) printing is determined from the number of color (full color, single color, two colors) printed sheets (counter value) and YMC pixel area. can do. In this case, in FIG. 2, under the control of the print control unit 111, the non-volatile storage area management unit 113 indicates the total number of prints of the color of each photoconductor and the total number of print pixels of the color of each photoconductor. Write in. Then, when determining whether or not the above-mentioned toner dropping probability is high, the total number of prints of the color of the photoconductor upstream from the non-volatile storage area and the total number of print pixels of the color of each photoconductor are calculated. By reading and comparing with a predetermined threshold value, it is determined whether or not the toner drop occurrence probability is high.

  Returning to FIG. 11B, if it is determined that the probability of toner drop is high (Yes in step S307), the print control unit 111 determines that there is a toner drop and uses the most upstream use photosensitive of the previous printing. The toner drop position on the intermediate transfer belt corresponding to the body is delayed until it passes the position of the most used photosensitive member for the current printing (step S308).

  Further, when it is determined that the printing is not the first sheet (No in step S305), when it is determined that the uppermost used photosensitive member of the previous printing is not upstream of the uppermost used photosensitive member of the current printing (step S306). No), when it is determined that the toner drop occurrence probability is not high (No in step S307), and after the delay (step S308), the print control unit 111 updates the information as “upstream use photosensitivity”. “Photosensitive body used most upstream for current printing” is set as “body” (step S309).

  Next, the print control unit 111 starts image writing (step S310) and ends printing (step S311).

  In addition, although the case where it applied to the 1st process example shown in FIG. 6 was demonstrated, it can apply similarly to the 2nd process example shown in FIG.

<Summary>
As described above, according to the present embodiment, when the photosensitive member is disposed on the upper side of the intermediate transfer belt, the toner accumulated between the photosensitive member and the cleaning blade falls on the intermediate transfer belt. The smearing of the intermediate transfer belt can be prevented by the delay at the start of printing, and the printing quality can be improved.

  In addition, since the delay at the start of printing is the minimum necessary amount, the photoconductor and the intermediate transfer belt are not spun excessively, the life of the photoconductor and the intermediate transfer belt is deteriorated, and the first copy time is deteriorated. Etc. can be minimized.

  The present invention has been described above by the preferred embodiments of the present invention. While the invention has been described with reference to specific embodiments, various modifications and changes may be made to the embodiments without departing from the broad spirit and scope of the invention as defined in the claims. Obviously you can. In other words, the present invention should not be construed as being limited by the details of the specific examples and the accompanying drawings.

DESCRIPTION OF SYMBOLS 1 Image forming apparatus 101 Scanner unit 102 Photoconductor 103 Charging device 104 Exposure device 105 Developing device 106 Cleaning blade 107 Intermediate transfer belt 108 Paper feed tray 109 Secondary transfer roller 110 Fixing unit 111 Print control unit 112 Central processing control unit 113 Non-volatile memory Area management unit 114 Temperature / humidity sensor detection control unit 115 Image formation control unit 116 Photoconductor control unit 117 Write control unit 118 Intermediate transfer belt control unit 119 Fixing control unit 120 Paper conveyance control unit

JP 2008-281689 A JP 2007-256636 A

Claims (11)

An image forming apparatus including a plurality of photoconductors on an upper side of an intermediate transfer belt along a driving direction of the intermediate transfer belt, and a cleaning blade for removing toner remaining on the photoconductor,
Storage means for storing print information of the last print of the previous time;
Based on the print information of the last print last time and the print information of the current first print stored in the storage unit, the toner drop at the end of the previous print affects the current print of the first print. When the first printing of the current printing is started, the photosensitive member and the intermediate transfer belt are driven and the uppermost stream of the last printing of the previous time is determined. Control means for starting image formation after a predetermined delay determined by the distance between the photoconductor and the most upstream photoconductor of the first printing of this time ,
The storage means stores the most upstream photoconductor information used during printing,
The control unit determines whether or not the most upstream photoconductor used for the last printing stored in the storage unit is upstream from the most upstream photoconductor used for the first printing of the current printing. And if it is upstream, the delay is performed . An image forming apparatus including a plurality of photoconductors on an upper side of an intermediate transfer belt along a driving direction of the intermediate transfer belt, and a cleaning blade for removing toner remaining on the photoconductor,
Storage means for storing print information of the last print of the previous time;
Based on the print information of the last print last time and the print information of the current first print stored in the storage unit, the toner drop at the end of the previous print affects the current print of the first print. When the first printing of the current printing is started, the photosensitive member and the intermediate transfer belt are driven and the uppermost stream of the last printing of the previous time is determined. Control means for starting image formation after a predetermined delay determined by the distance between the photoconductor and the most upstream photoconductor of the first printing of this time;
With
In the arrangement configuration in which the most downstream photoconductor is K color,
The storage means stores information on a print mode used at the time of printing,
The control unit executes the delay when the last printing mode stored in the storage unit is color printing and the first printing mode of the current printing is monochrome printing. Do
An image forming apparatus. An image forming apparatus including a plurality of photoconductors on an upper side of an intermediate transfer belt along a driving direction of the intermediate transfer belt, and a cleaning blade for removing toner remaining on the photoconductor,
Storage means for storing print information of the last print of the previous time;
Based on the print information of the last print last time and the print information of the current first print stored in the storage unit, the toner drop at the end of the previous print affects the current print of the first print. When the first printing of the current printing is started, the photosensitive member and the intermediate transfer belt are driven and the uppermost stream of the last printing of the previous time is determined. Control means for starting image formation after a predetermined delay determined by the distance between the photoconductor and the most upstream photoconductor of the first printing of this time;
With
A non-volatile memory that stores the total number of printed sheets of the color of each photoconductor,
The control means implements the delay only when the number of upstream photoreceptor color prints stored in the nonvolatile memory exceeds a predetermined threshold.
An image forming apparatus. The image forming apparatus according to any one of claims 1 to 3 ,
A temperature sensor for measuring the temperature in the image forming apparatus and / or a humidity sensor for measuring humidity;
A nonvolatile memory for storing the temperature sensor and / or the measured value of the humidity sensor;
The image forming apparatus according to claim 1, wherein the control unit performs the delay only when a measured value stored in the nonvolatile memory is equal to or less than a predetermined threshold value. The image forming apparatus according to any one of claims 1 to 4 ,
Other nonvolatile memory that stores the total number of print pixels for each photoconductor color is provided,
The image forming apparatus according to claim 1, wherein the control unit implements the delay only when the number of printing pixels of the upstream photoconductor color stored in the other nonvolatile memory exceeds a predetermined threshold value. A method executed by an image forming apparatus including a plurality of photoconductors disposed on an upper side of an intermediate transfer belt along a driving direction of the intermediate transfer belt and including a cleaning blade for removing toner remaining on the photoconductor. ,
A storage procedure for storing print information of the last print of the previous time;
Based on the print information of the last print last time and the print information of the first print stored in the storage procedure, the toner drop at the end of the previous print affects the first print of the current print. When the first printing of the current printing is started, the photosensitive member and the intermediate transfer belt are driven and the uppermost stream of the last printing of the previous time is determined. A control procedure for starting image formation after a predetermined delay determined by the distance between the photoconductor and the most upstream photoconductor of the first printing of this time;
With
The storage procedure stores the most upstream photoconductor information used during printing,
In the control procedure, it is determined whether or not the most upstream photoconductor used in the last printing stored in the storage procedure is upstream from the most upstream photoconductor used in the first printing of the current printing. And if it is upstream, implement the delay
An image formation control method characterized by the above. A method executed by an image forming apparatus including a plurality of photoconductors disposed on an upper side of an intermediate transfer belt along a driving direction of the intermediate transfer belt and including a cleaning blade for removing toner remaining on the photoconductor. ,
A storage procedure for storing print information of the last print of the previous time;
Based on the print information of the last print last time and the print information of the first print stored in the storage procedure, the toner drop at the end of the previous print affects the first print of the current print. When the first printing of the current printing is started, the photosensitive member and the intermediate transfer belt are driven and the uppermost stream of the last printing of the previous time is determined. A control procedure for starting image formation after a predetermined delay determined by the distance between the photoconductor and the most upstream photoconductor of the first printing of this time;
With
In the arrangement configuration in which the most downstream photoconductor is K color,
The storage procedure stores information on a print mode used at the time of printing,
The control procedure implements the delay when the printing mode of the last printing stored in the storing procedure is color printing and the first printing mode of the current printing is monochrome printing. Do
An image formation control method characterized by the above. A method executed by an image forming apparatus including a plurality of photoconductors disposed on an upper side of an intermediate transfer belt along a driving direction of the intermediate transfer belt and including a cleaning blade for removing toner remaining on the photoconductor. ,
A storage procedure for storing print information of the last print of the previous time;
Based on the print information of the last print last time and the print information of the first print stored in the storage procedure, the toner drop at the end of the previous print affects the first print of the current print. When the first printing of the current printing is started, the photosensitive member and the intermediate transfer belt are driven and the uppermost stream of the last printing of the previous time is determined. A control procedure for starting image formation after a predetermined delay determined by the distance between the photoconductor and the most upstream photoconductor of the first printing of this time;
With
The control procedure implements the delay only when the number of upstream photoreceptor color prints stored in the non-volatile memory that stores the total number of prints of each photoreceptor color exceeds a predetermined threshold.
An image formation control method characterized by the above. A program for an image forming apparatus comprising a plurality of photoconductors disposed on an upper side of an intermediate transfer belt along a driving direction of the intermediate transfer belt and including a cleaning blade for removing toner remaining on the photoconductor.
A storage procedure for storing print information of the last print of the previous time;
Based on the print information of the last print last time and the print information of the first print stored in the storage procedure, the toner drop at the end of the previous print affects the first print of the current print. When the first printing of the current printing is started, the photosensitive member and the intermediate transfer belt are driven and the uppermost stream of the last printing of the previous time is determined. A control procedure for starting image formation after a predetermined delay determined by the distance between the photoconductor and the most upstream photoconductor of the first printing of this time;
To the computer,
The storage procedure stores the most upstream photoconductor information used during printing,
In the control procedure, it is determined whether or not the most upstream photoconductor used in the last printing stored in the storage procedure is upstream from the most upstream photoconductor used in the first printing of the current printing. And if it is upstream, implement the delay
Image formation control program. A program for an image forming apparatus comprising a plurality of photoconductors disposed on an upper side of an intermediate transfer belt along a driving direction of the intermediate transfer belt and including a cleaning blade for removing toner remaining on the photoconductor.
A storage procedure for storing print information of the last print of the previous time;
Based on the print information of the last print last time and the print information of the first print stored in the storage procedure, the toner drop at the end of the previous print affects the first print of the current print. When the first printing of the current printing is started, the photosensitive member and the intermediate transfer belt are driven and the uppermost stream of the last printing of the previous time is determined. A control procedure for starting image formation after a predetermined delay determined by the distance between the photoconductor and the most upstream photoconductor of the first printing of this time;
To the computer,
In the arrangement configuration in which the most downstream photoconductor is K color,
The storage procedure stores information on a print mode used at the time of printing,
The control procedure implements the delay when the printing mode of the last printing stored in the storing procedure is color printing and the first printing mode of the current printing is monochrome printing. Do
Image formation control program. A program for an image forming apparatus comprising a plurality of photoconductors disposed on an upper side of an intermediate transfer belt along a driving direction of the intermediate transfer belt and including a cleaning blade for removing toner remaining on the photoconductor.
A storage procedure for storing print information of the last print of the previous time;
Based on the print information of the last print last time and the print information of the first print stored in the storage procedure, the toner drop at the end of the previous print affects the first print of the current print. When the first printing of the current printing is started, the photosensitive member and the intermediate transfer belt are driven and the uppermost stream of the last printing of the previous time is determined. A control procedure for starting image formation after a predetermined delay determined by the distance between the photoconductor and the most upstream photoconductor of the first printing of this time;
To the computer,
The control procedure implements the delay only when the number of upstream photoreceptor color prints stored in the non-volatile memory that stores the total number of prints of each photoreceptor color exceeds a predetermined threshold.
Image formation control program.

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