JP2011002731A - Image forming apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress meaningless driving of a unit simultaneously driven by a common driving source.SOLUTION: The image forming apparatus includes a plurality of units 12K, 20 and 22 simultaneously driven by the common driving source 40, and each of the units 12K, 20 and 22 is adjusted while being driven by the common driving source 40. A parameter is set for each adjustment that is used for indicating need for the adjustment and determining whether it is executed simultaneously with the other adjustment determined to be executed. Adjustment where the parameter exceeds a first threshold is executed simultaneously with the other adjustment determined to be executed, adjustment where the parameter does not exceed a second threshold smaller than the first threshold is not executed simultaneously, and the simultaneous execution of the adjustment where the parameter is between the first threshold and the second threshold is determined based on a required period for each adjustment.

Description

  The present invention relates to an image forming apparatus having a plurality of units that are simultaneously driven by a common drive source, and each unit is adjusted while being driven by the drive source, and belongs to the field of maintenance technology of image forming apparatuses. .

  Conventionally, in an image forming apparatus, in order to maintain good image quality, components such as a photoconductor related to image formation are regularly and automatically adjusted.

  For example, when the cumulative number of printed sheets exceeds a predetermined number, the intermediate transfer belt is temporarily prohibited from performing image formation and is cleaned over a predetermined time. Specifically, in the case of an image forming apparatus that uses negative polarity toner, the intermediate transfer belt is driven by a drive source for a predetermined time in a state where a negative high voltage is applied. As a result, the residual toner having a weak electrostatic adhesion on the image carrying surface of the intermediate transfer belt is scraped off by the cleaning blade of the cleaning device in contact with the image carrying surface.

  Further, for example, as another adjustment, there is ATVC (Automatic Transfer Voltage Control). This is an adjustment that allows the toner image carried by the intermediate transfer belt to be transferred to the sheet conveyed between the secondary transfer roller and the intermediate transfer belt satisfactorily and stably.

  To explain, the current flowing between the secondary transfer roller and the intermediate transfer belt by applying a voltage to the secondary transfer roller is not a predetermined current that can stably transfer the toner image to the sheet. Don't be. However, the physical properties of the secondary transfer roller change temporarily due to changes in the image forming environment (for example, changes in ambient temperature), and the current flowing between the secondary transfer roller and the intermediate transfer belt is different from the predetermined current. There is.

  As a countermeasure for this, there is ATVC, and the application voltage of the secondary transfer roller allows a predetermined current to flow between the secondary transfer roller and the intermediate transfer belt each time the image forming environment changes. Changed to voltage.

  Specifically, the voltage applied to the secondary transfer roller is changed while the secondary transfer roller and the intermediate transfer belt are rotated by a drive source in the same manner as in actual image formation, and the secondary transfer roller and the intermediate transfer belt are The voltage through which a predetermined current flows is searched for. This found voltage is used as the voltage applied to the secondary transfer roller until the next image forming environment changes. An example of such ATVC is described in Patent Document 1.

JP 2007-65389 A

  However, when each of the plurality of units such as the above-described intermediate transfer belt and secondary transfer roller is driven by a common drive source instead of individual drive sources, adjustment is performed while one unit is driven by the common drive source. When this occurs, the other units are driven meaninglessly.

  For example, in the above-described example, when the intermediate transfer belt is cleaned, the secondary transfer roller is driven meaninglessly. In this case, the unit that is meaninglessly driven is driven not for image formation but for its own adjustment, and therefore its life is shortened wastefully. In addition, since the common drive source also outputs the driving force in vain, its life is shortened.

  Therefore, the present invention has a plurality of units that are simultaneously driven by a common drive source, and an image forming apparatus in which adjustment is performed while each unit is driven by the drive source. When the adjustment is performed while being driven by the driving source, the other unit is driven to the meaninglessly by the driving source, thereby preventing the life of the other unit from being shortened. Further, it is possible to prevent the life of the common drive source from being shortened wastefully.

In order to solve the above-described problems, the present invention provides an image forming apparatus that includes a plurality of units that are simultaneously driven by a common drive source, and each unit performs adjustment while being driven by the drive source.
For each of the adjustments, a parameter that indicates the necessity of the adjustment and that is used to determine whether or not to execute simultaneously with other adjustments that are determined to be executed is set,
Adjustments where the parameter exceeds the first threshold are performed simultaneously,
Adjustments in which the parameter does not exceed a second threshold value that is smaller than the first threshold value are not performed simultaneously,
It is determined whether or not the adjustment in which the parameter is between the first threshold value and the second threshold value is performed simultaneously based on the necessary time of each of the adjustments.

  Note that the “adjustment” described in the present specification requires that the unit to be adjusted is driven by the drive source at the time of execution.

  According to the present invention, when an adjustment is performed in an image forming apparatus having a plurality of units that are simultaneously driven by a common drive source, the necessity of execution of the parameter exceeding the first threshold is relatively Adjustments that are relatively high and, in some cases, adjustments that have a relatively low need for execution when the parameter is between a first threshold and a second threshold that is lower than the first threshold. Executed. As a result, it is less likely that one unit is adjusted while being driven by a common drive source, and the other units are meaninglessly driven by the drive source. As a result, the life of each of the plurality of units is prevented from being shortened wastefully.

  In addition, since a plurality of adjustments are simultaneously performed as much as possible, the total operation time for adjusting the common drive source is shortened. As a result, it is possible to prevent the life of the common drive source from being shortened wastefully.

1 is a diagram schematically illustrating a configuration of an image forming apparatus according to an embodiment of the present invention. FIG. 2 is a diagram schematically showing a part of a drive system of the image forming apparatus shown in FIG. 1. FIG. 2 is a diagram schematically showing a control system of the image forming apparatus shown in FIG. 1. FIG. 2 is a table showing an example of adjustments executed in the image forming apparatus shown in FIG. 1 and execution conditions thereof. It is a figure which shows the table | surface of the some case from which the establishment condition of several execution conditions each differs. A part of flowchart for determining adjustment control which changes with the satisfaction conditions of several conditions is shown. The other part of the flowchart for determining adjustment control which changes with the satisfaction conditions of several conditions is shown. The remaining one part of the flowchart for determining adjustment control which changes with the satisfaction conditions of several conditions is shown. It is a figure which shows the Example and comparative example of simultaneous execution of several adjustment which concern on one Embodiment of this invention. It is a figure which shows the example of the several simultaneous execution which concerns on other embodiment of this invention.

  Hereinafter, an image forming apparatus according to an embodiment of the present invention will be described with reference to FIG. FIG. 1 is a diagram schematically showing the configuration of an image forming apparatus according to the present invention.

  An image forming apparatus denoted by reference numeral 10 is an apparatus that forms an image on a sheet S using yellow (Y), magenta (M), cyan (C), and black (K) toners. In addition, the component in which the code | symbol contains the alphabet of Y, M, C, and K is a component for the color corresponding to the alphabet.

  The image forming apparatus 10 includes cylindrical photosensitive members 12Y, 12M, 12C, and 12K, charging devices 14Y, 14M, 14C, and 14K that uniformly charge the surface (image carrying surface) of the photosensitive member, and charged images. Exposure devices 16Y, 16M, 16C, and 16K that form latent images on the carrying surface, and developing devices 18Y, 18M, 18C, and 18K that develop the latent images on the image carrying surface with toner.

  Further, the image forming apparatus 10 includes an intermediate transfer belt 20 onto which toner images on the image bearing surfaces of the photoreceptors 12Y, 12M, 12C, and 12K are transferred, and a surface (image bearing surface) of the intermediate transfer belt 20. A secondary transfer roller 22 for transferring the four color toner images (color image) transferred on the sheet S to the sheet S, and fixing for thermally fixing the color image transferred on the sheet S by the heater lamp 24 to the sheet S. Device 26.

  Further, the image forming apparatus 10 cleans the photoreceptors 12Y, 12M, 12C, and 12K by scraping the toner remaining on the image carrying surface after the toner image is transferred to the intermediate transfer belt 20, and cleaning apparatuses 28Y, 28M, 28C, and 28K. And a cleaning device 30 that cleans the intermediate transfer belt 20 by scraping off toner remaining on the image bearing surface after the color image is transferred to the sheet S.

  In the image forming apparatus 10, an image is formed on the sheet S as follows.

  First, the image bearing surfaces of the photoreceptors 12Y, 12M, 12C, and 12K cleaned by the cleaning devices 28Y, 28M, 28C, and 28K are uniformly charged by the charging devices 14Y, 14M, 14C, and 14K. Next, latent images are formed on the charged image bearing surface by the exposure devices 16Y, 16M, 16C, and 16K. Subsequently, the latent image formed on the image carrying surface is developed by the developing devices 18Y, 18M, 18C, and 18K (a toner image is formed).

  The toner images on the image bearing surfaces of the photoreceptors 12Y, 12M, 12C, and 12K are electrostatically transferred to the intermediate transfer belt 20 in order and superimposed on the image bearing surface of the intermediate transfer belt 20 (color image). Is formed).

  The color image on the image carrying surface of the intermediate transfer belt 20 is moved to a region between the secondary transfer roller 22 and the intermediate transfer belt 20, and is electrostatically transferred to the sheet S conveyed to that region. .

  The color image on the sheet S is heated and fixed on the sheet S by the fixing device 26.

  From here, an example of the adjustment according to the present invention will be described.

  FIG. 2 schematically shows a part of the drive system of the image forming apparatus 10. FIG. 3 schematically shows a control system of the image forming apparatus 10 that performs the adjustment.

The drive system shown in FIG. 2 includes a photoconductor 12K, an intermediate transfer belt 20, a secondary transfer roller 22, and a common motor 40 that drives them. Specifically, the intermediate transfer belt 20 is supported by a driving roller 42 disposed opposite to the secondary transfer roller 22, a conductive roller 44 to which a voltage is applied by a voltage applying unit described later, and a roller (not shown). The motor 40 is driven by rotating the driving roller 42. In the figure, a one-dot chain line indicates a driving force transmission path constituted by a belt, a gear, or the like.

  The photoconductor 12K, the intermediate transfer belt 20, and the secondary transfer roller 22 mentioned here are examples of objects to be driven by a common drive source, and the present invention is not limited to this.

  Further, as shown in FIG. 2, a voltage applying unit 46 that applies a voltage to the secondary transfer roller 22, a voltage applying unit 48 that applies a voltage to the roller 44, the intermediate transfer belt 20, and the secondary transfer roller 22. And an ammeter 50 for detecting a current flowing between them.

  A control device 70 shown in FIG. 3 is a control device that controls each of the above-described various devices of the image forming apparatus 10, and counts the total number of printed sheets of the intermediate transfer belt 20 as a component according to the present invention. Intermediate transfer belt print number counter 72, secondary transfer roller print number counter 74 that counts the total number of prints of the secondary transfer roller 22, and photoconductor rotation number counter that counts the total number of rotations of the photoconductor 12K. Unit 76, a continuous stop time measuring unit 78 that measures the continuous stop time of the photoreceptor 12 </ b> K, and a temperature storage unit 82 that stores the temperature detected by the temperature sensor 80.

  The temperature sensor 80 is a sensor that detects the temperature around the secondary transfer roller 22. Further, the continuous stop time counting unit 78 is configured to count even when the image forming apparatus 10 is not powered on.

  The control device 70 includes a count number of the two printed sheet counter units 72 and 74, a count number of the photosensitive member rotation number counter unit 76, a continuous stop time of the photosensitive member 12K measured by the continuous stop time measuring unit 78, By controlling the motor 40 and voltage application means 46 and 48 based on the temperature around the secondary transfer roller 22 detected by the temperature sensor 80 and the current detected by the ammeter 50, the photosensitive member 12K, intermediate transfer Adjustment is performed on the belt 20 and the secondary transfer roller 22.

  FIG. 4 shows the adjustments performed by the control device 70 on the photosensitive member 12K, the intermediate transfer belt 20, and the secondary transfer roller 22, the time required for the adjustments, and the conditions for executing the adjustments. Shown below.

  First, the contents of each adjustment will be described.

  Cleaning of the photoconductor 12K is performed by idly rotating the photoconductor 12K for 10 seconds. Specifically, the control device 70 temporarily prohibits image formation, that is, the charging device 14K, the exposure device 16K, and the developing device 18K around the photoconductor 12K are stopped, and the motor 40 is turned on for 10 seconds. By actuating, the photoreceptor 12K is idled. As a result, deposits such as nitrogen oxides on the image bearing surface of the photoreceptor 12K are removed by the cleaning device 28K.

  The intermediate transfer belt 20 is cleaned by idling the intermediate transfer belt 20 with a high voltage applied. Specifically, the control device 70 controls the voltage application unit 48 to operate the motor 40 for 12 seconds in a state where a high voltage having the same polarity as the toner is applied to the intermediate transfer belt 20 via the conductive roller 44. As a result, the intermediate transfer belt 20 is idly rotated. As a result, the residual toner whose electrostatic adhesion force on the image carrying surface of the intermediate transfer belt 20 is weakened is removed by the cleaning device 30.

  Cleaning of the secondary transfer roller 22 is performed by idling the secondary transfer roller 22 with a high voltage applied. Specifically, the control device 70 controls the voltage application unit 46 to operate the motor 40 for 10 seconds while alternately applying voltages of +500 V and −500 V, for example, to the secondary transfer roller 22, thereby performing the secondary operation. The transfer roller 22 is rotated idly. Thereby, the toner adhering to the surface of the secondary transfer roller 22 is electrostatically moved to the intermediate transfer belt 20 rotating together. The toner electrostatically moved to the intermediate transfer belt 20 is removed by the cleaning device 30.

  In the ATVC of the secondary transfer roller 22, first, the control device 70 monitors the current flowing between the intermediate transfer belt 20 and the secondary transfer roller 22 via the ammeter 50, and simultaneously controls the motor 40 for 4 seconds. While operating to rotate the secondary transfer roller 22 and the intermediate transfer belt 22, the voltage application means 46 is further controlled to change the voltage applied to the secondary transfer roller 22. Then, the control device 70 searches for a voltage value at which a predetermined current flows between the intermediate transfer belt 20 and the secondary transfer roller 22. This predetermined current is a current that can satisfactorily transfer the toner image from the intermediate transfer belt 20 to the sheet S. The found voltage value is stored in a storage device (not shown), and the control device 70 applies the stored voltage value to the secondary transfer roller 22 to the voltage application means 46 until the next ATVC is executed. Apply. Further, the temperature when the ATVC is executed is stored in the temperature storage unit 82.

  The adjustment described here is an example, and the present invention is not limited to this.

  From here, conditions for executing the above-described adjustment will be described.

  As shown in FIG. 4, the absolute execution condition and the first and second simultaneous execution conditions are set for each adjustment.

  The absolute execution condition is defined to be satisfied when adjustment is absolutely necessary. Therefore, the adjustment that satisfies the absolute execution condition is always executed.

  However, when the absolute execution condition is satisfied simultaneously in a plurality of adjustments, the plurality of adjustments are always executed, but not all are executed simultaneously. This is because at least some of the adjustments among the plurality of adjustments for which the absolute execution condition is satisfied cannot be executed simultaneously.

  For example, this corresponds to a case where both the secondary transfer roller cleaning and the ATVC are included in a plurality of adjustments that satisfy the absolute execution condition. These secondary transfer roller cleaning and ATVC cannot be executed simultaneously because the method of applying a voltage to the roller 22 is different as described above. In this case, only the secondary transfer roller cleaning that requires a long time for adjustment is performed simultaneously with other adjustments. After the completion of the simultaneous execution, the ATVC that has not been simultaneously executed is executed.

  The first simultaneous execution condition is a condition for executing simultaneously with the adjustment in which the absolute execution condition is satisfied, and therefore includes that the adjustment in which the absolute execution condition is satisfied exists as part of the condition. The adjustment in which the first simultaneous execution condition is satisfied is executed simultaneously with the adjustment in which the absolute execution condition is satisfied in principle. Further, the first simultaneous execution condition is defined so as to be established when the necessity for adjustment is lower than the absolute execution condition.

  However, if the adjustment that satisfies the first simultaneous execution condition cannot be performed simultaneously with the adjustment that satisfies the absolute execution condition, the adjustment that satisfies the first simultaneous execution condition is not executed. For example, this corresponds to the case where the absolute execution condition of the secondary transfer roller cleaning is satisfied and the first simultaneous execution condition of ATVC is satisfied.

  In addition, when there are a plurality of adjustments that satisfy the first simultaneous execution condition and at least some of the adjustments cannot be executed simultaneously, the longest necessary time is selected from the at least some adjustments. Only the adjustment is performed simultaneously with the adjustment for which the absolute execution condition is satisfied. For example, when the first simultaneous execution condition of the secondary transfer roller cleaning with the required time of 10 seconds and the ATVC with the required time of 4 seconds is satisfied, the secondary transfer roller cleaning is executed simultaneously with the adjustment in which the absolute execution condition is satisfied. ATVC is not executed.

  The second simultaneous execution condition is a condition for executing simultaneously with the adjustment in which the absolute execution condition is satisfied, and therefore includes that the adjustment in which the absolute execution condition is satisfied exists as part of the condition.

  However, unlike the first simultaneous execution condition, the adjustment in which the second simultaneous execution condition is satisfied requires the time to be compared with the necessary time for the adjustment in which the absolute execution condition is satisfied, and at the same time, the first simultaneous execution condition. If there is also an adjustment for which is established, it is executed simultaneously if it is shorter than the longest time of the two adjustment times. On the other hand, if it is long, it is not executed. For example, when the absolute execution condition of ATVC with a required time of 4 seconds is satisfied and the second simultaneous execution condition of the intermediate transfer belt cleaning with a required time of 12 seconds is satisfied, the intermediate transfer belt cleaning is not executed. The second simultaneous execution condition is defined so as to be established when the necessity for adjustment is lower than that of the first simultaneous execution condition.

  Further, when there are a plurality of adjustments that satisfy the second simultaneous execution condition and at least some of the adjustments cannot be executed simultaneously, the longest necessary time is selected from the at least some adjustments. Only the adjustment is performed simultaneously with the adjustment for which the absolute execution condition is satisfied.

  Furthermore, the adjustment in which the second simultaneous execution condition is satisfied cannot be performed simultaneously with the adjustment in which the absolute execution condition is satisfied, and the adjustment in which the first simultaneous execution condition is satisfied is the adjustment in which the absolute execution condition is satisfied. If they are executed simultaneously, they will not be executed if they cannot be executed simultaneously with the adjustment that satisfies the first simultaneous execution condition.

  Next, details of the absolute execution condition and the first and second simultaneous execution conditions will be described.

  As for the photoconductor cleaning, as shown in FIG. 4, all conditions include a condition that the total number of rotations of the photoconductor 12K is 400,000 or more, and in addition, the absolute stop condition is a continuous stop of the photoconductor 12K. The condition that the time is 8 hours or more is included, the first simultaneous execution condition includes the condition of 7 to 8 hours, and the second simultaneous execution condition includes the condition of 6 to 7 hours. Here, 7 hours corresponds to the “first threshold value” recited in the claims, and 6 hours corresponds to the “second threshold value”.

  Whether each condition is satisfied is determined based on the count number of the photoconductor rotation number counter unit 76 and the continuous stop time measured by the continuous stop time timer 78. When the cleaning of the photosensitive member 12K is completed, the count number of the photosensitive member rotation number counter unit 76 is reset to zero.

  As for the intermediate transfer belt cleaning, as shown in FIG. 4, the absolute execution condition is a condition that the cumulative number of printed sheets of the intermediate transfer belt 20 is 100 sheets or more, and the first simultaneous execution condition is a condition of 80 to 100 sheets. In addition, the second simultaneous execution condition is a condition of 50 to 80 sheets. Here, 80 sheets correspond to the “first threshold value” and 50 sheets correspond to the “second threshold value”.

  Whether each condition is satisfied is determined based on the count number of the intermediate transfer belt printed sheet counter 72. When the cleaning of the intermediate transfer belt 20 is completed, the count number of the intermediate transfer belt printed sheet counter 72 is reset to zero.

  As for the secondary transfer roller cleaning, as shown in FIG. 4, the absolute execution condition is that the cumulative number of printed sheets of the secondary transfer roller 22 is 300 or more, and the first simultaneous execution condition is 290 to 300 sheets. The second simultaneous execution condition is a condition of 100 to 290 sheets. Here, 290 sheets correspond to the “first threshold value” and 100 sheets correspond to the “second threshold value”.

  Determination of whether each condition is satisfied is performed based on the count number of the secondary transfer roller printing sheet counter 74. When the cleaning of the secondary transfer roller 22 is completed, the count number of the secondary transfer roller printing sheet counter 74 is reset to zero.

  As for ATVC, as shown in FIG. 4, the absolute execution condition is a condition that the difference from the temperature at the previous ATVC execution is 2 ° C. or more, and the first simultaneous execution condition is 1.6 to 2 ° C. Therefore, the second simultaneous execution condition is a condition of 1 to 1.6 ° C. Here, 1.6 ° C. corresponds to the “first threshold value”, and 1 ° C. corresponds to the “second threshold value”.

  Whether each condition is satisfied is determined based on the temperature detected by the temperature sensor 80 and the temperature at the previous ATVC execution stored in the temperature storage unit 82.

  Note that the adjustment execution conditions described here are merely examples, and if the types of image forming apparatuses are different, the contents of the conditions are appropriately changed.

  From here, when the adjustment that satisfies the absolute execution condition is executed, the control device 70 according to the present invention when the first or second simultaneous execution condition is satisfied (case) in at least one of the adjustments. A control flow will be described. Since there are several cases, the control of the control device 70 corresponding to each case will be described with reference to FIG.

(Case A)
In case A, when an adjustment that satisfies the absolute execution condition (hereinafter referred to as “absolute condition establishment adjustment”) is executed, an adjustment that satisfies the first simultaneous execution condition (hereinafter referred to as “first condition”). This is a case in which there is no “satisfying adjustment”) and there is at least one adjustment in which the second simultaneous execution condition is satisfied (hereinafter referred to as “second condition establishment adjustment”).

In this case, as the control corresponding to case A, the control device 70 separates the control that can be executed simultaneously only in at least one second condition satisfaction adjustment and the control that cannot be executed simultaneously. For example, when the second simultaneous execution condition of intermediate transfer belt cleaning, secondary transfer roller cleaning, and ATVC is satisfied, a group that can be executed simultaneously including intermediate transfer belt cleaning, secondary transfer roller cleaning, and ATVC are included. Sort into groups that cannot be executed simultaneously.

Subsequently, the control device 70 picks up one adjustment of the longest necessary time from the sorted second condition satisfaction adjustments that cannot be executed simultaneously. For example, in the case of secondary transfer roller cleaning and ATVC that cannot be performed simultaneously, as shown in FIG. 4, secondary transfer roller cleaning with a long required time is picked up.

  Subsequently, among the sorted second condition establishment adjustments that can be executed simultaneously and one second condition establishment adjustment that has been picked up, the one that has a shorter required time than the time required for the absolute condition establishment adjustment is further picked up. . For example, when the absolute condition establishment adjustment is a photoconductor cleaning with an adjustment time of 10 seconds, a secondary transfer roller with an adjustment time of 10 seconds is selected from the separated intermediate transfer belt cleaning and the picked-up secondary transfer roller cleaning. Cleaning is further picked up (intermediate transfer belt cleaning with an adjustment time of 12 seconds is not picked up).

Further, among the picked-up second condition satisfaction adjustments, those that can be executed simultaneously with the absolute condition satisfaction adjustment are simultaneously executed. For example, when the second condition establishment adjustment that has been further picked up is the secondary transfer roller cleaning and the absolute condition satisfaction adjustment is the photosensitive member cleaning, these can be executed at the same time.

(Case B)
Case B is a case where there is one first condition satisfaction adjustment and no second condition satisfaction adjustment when an adjustment that satisfies the absolute execution condition is executed.

In this case, as a control corresponding to case B, the control device 70 executes the first condition establishment adjustment simultaneously if it can be executed simultaneously with the absolute condition establishment adjustment.

(Case C)
Case C is a case where there is one first condition satisfaction adjustment and one second condition satisfaction adjustment when an adjustment that satisfies the absolute execution condition is executed.

  In this case, as a control corresponding to the case C, the control device 70 first determines that the first condition establishment adjustment is executed simultaneously if it can be executed simultaneously with the absolute condition establishment adjustment.

  Next, the control device 70 compares the second condition satisfaction adjustment with the longest time of either the necessary time for the absolute condition satisfaction adjustment or the necessary time for the first condition satisfaction adjustment for which simultaneous execution is determined. The first condition establishment adjustment for which the absolute condition establishment adjustment and the simultaneous execution are determined, and the simultaneous execution are determined to be performed simultaneously.

  And the control apparatus 70 performs the determined adjustment simultaneously.

(Case D)
In case D, when an adjustment that satisfies the absolute execution condition is executed, there is one first condition establishment adjustment, a plurality of second condition establishment adjustments, and a plurality of second condition establishment adjustments are simultaneously performed. This is a feasible case. For example, this corresponds to the case where the secondary transfer roller cleaning and ATVC are not included in the plurality of second condition satisfaction adjustments.

  In this case, as the control corresponding to case D, the control device 70 first determines that the first condition satisfaction adjustment is to be performed simultaneously if it can be performed simultaneously with the absolute condition satisfaction adjustment.

  Next, the control device 70 selects the longest time required between the time required for the absolute condition satisfaction adjustment and the time required for the first condition satisfaction adjustment for which simultaneous execution is determined from among the plurality of second condition satisfaction adjustments. Pick up something short compared to the time. From the picked-up second condition satisfaction adjustments, it is determined that the absolute condition satisfaction adjustment and the first condition satisfaction adjustment for which simultaneous execution has been determined and those that can be executed simultaneously are executed simultaneously.

  And the control apparatus 70 performs the determined adjustment simultaneously.

(Case E)
Case E has one first condition establishment adjustment, multiple second condition establishment adjustments, and, unlike case D, when there is an adjustment that satisfies the absolute execution condition, and there are a plurality of second condition establishment adjustments. This is a case where some adjustments in the establishment adjustment cannot be executed simultaneously. For example, this corresponds to a case where secondary transfer roller cleaning and ATVC are included in the plurality of second condition satisfaction adjustments.

  In this case, as the control corresponding to case E, the control device 70 first determines that the first condition satisfaction adjustment is to be performed simultaneously if it can be performed simultaneously with the absolute condition satisfaction adjustment.

  Next, the control device 70 separates those that can be executed simultaneously only in the plurality of second condition satisfaction adjustments from those that cannot be executed simultaneously.

  Subsequently, the control device 70 picks up one adjustment of the longest necessary time from the sorted second condition satisfaction adjustments that cannot be executed simultaneously. Subsequently, the first time in which the necessary time is determined to be executed simultaneously with the time required for the absolute condition satisfaction adjustment from among the sorted second condition satisfaction adjustment that can be executed simultaneously and the one second condition satisfaction adjustment that has been picked up. A thing shorter than the longest time of the necessary time for condition establishment adjustment is further picked up. Further, it is determined that the second condition satisfaction adjustment that has been picked up is executed simultaneously with the absolute condition satisfaction adjustment and the first condition satisfaction adjustment for which simultaneous execution is determined, if possible.

  And the control apparatus 70 performs the determined adjustment simultaneously.

(Case F)
In case F, when an adjustment that satisfies the absolute execution condition is executed, there are a plurality of first condition establishment adjustments, no second condition establishment adjustment, and a plurality of first condition establishment adjustments are simultaneously performed. This is a feasible case.

  In this case, as the control corresponding to case F, the control device 70 simultaneously executes a plurality of first condition satisfaction adjustments that can be executed simultaneously with the absolute condition satisfaction adjustment.

(Case G)
Case G is different from Case F in that there are a plurality of first condition satisfaction adjustments and there is no second condition satisfaction adjustment when an adjustment that satisfies the absolute execution condition is executed. This is a case where some adjustments in the establishment adjustment cannot be executed simultaneously.

  In this case, as the control corresponding to the case G, the control device 70 first classifies the control that can be executed simultaneously only in the plurality of first condition establishment adjustments and the control that cannot be executed simultaneously. Next, one longest necessary time adjustment is picked up from the sorted first condition satisfaction adjustments that cannot be executed simultaneously. Subsequently, it is determined to simultaneously execute those that can be executed simultaneously with the absolute condition establishment adjustment from among the sorted first condition establishment adjustment that can be executed simultaneously and one picked up first condition establishment adjustment.

  And the control apparatus 70 performs the determined adjustment simultaneously.

(Case H)
In case H, when an adjustment that satisfies the absolute execution condition is executed, there are a plurality of first condition establishment adjustments, one second condition establishment adjustment, and a plurality of first condition establishment adjustments simultaneously. This is a feasible case.

  In this case, as the control corresponding to case H, first, the control device 70 determines to simultaneously execute a plurality of first condition establishment adjustments that can be executed simultaneously with the absolute condition establishment adjustment.

  Next, the control device 70 compares the second condition satisfaction adjustment with the longest time of either the necessary time for the absolute condition satisfaction adjustment or the necessary time for the first condition satisfaction adjustment for which simultaneous execution is determined. The first condition establishment adjustment for which the absolute condition establishment adjustment and the simultaneous execution are determined, and the simultaneous execution are determined to be performed simultaneously.

  And the control apparatus 70 performs the determined adjustment simultaneously.

(Case I)
Case I has a plurality of first condition satisfaction adjustments and one second condition satisfaction adjustment when an adjustment that satisfies the absolute execution condition is executed. This is a case where some adjustments in the establishment adjustment cannot be executed simultaneously.

  In this case, as the control corresponding to case I, the control device 70 first classifies the control that can be executed simultaneously only in the plurality of first condition establishment adjustments and the control that cannot be executed simultaneously. Next, one longest necessary time adjustment is picked up from the sorted first condition satisfaction adjustments that cannot be executed simultaneously. Subsequently, it is determined to simultaneously execute those that can be executed simultaneously with the absolute condition establishment adjustment from the sorted first condition establishment adjustment that can be executed simultaneously and the one first condition establishment adjustment that has been picked up.

  Further, the control device 70 compares the second condition satisfaction adjustment with the longest time of either the necessary time for the absolute condition satisfaction adjustment or the necessary time for the first condition satisfaction adjustment for which simultaneous execution is determined. The first condition satisfaction adjustment, which is short and the absolute condition establishment adjustment and simultaneous execution are determined, is determined to be executed simultaneously if simultaneous execution is possible.

  And the control apparatus 70 performs the determined adjustment simultaneously.

(Case J)
Case J has a plurality of first condition establishment adjustments, a plurality of second condition establishment adjustments, and a plurality of first condition establishment adjustments simultaneously when an adjustment that satisfies the absolute execution condition is executed. This is a case that can be executed and a plurality of second condition satisfaction adjustments can be executed simultaneously.

  In this case, as the control corresponding to case J, first, the control device 70 determines to simultaneously execute a plurality of first condition establishment adjustments that can be executed simultaneously with the absolute condition establishment adjustment.

  Next, the control device 70 selects the longest time required between the time required for the absolute condition satisfaction adjustment and the time required for the first condition satisfaction adjustment for which simultaneous execution is determined from among the plurality of second condition satisfaction adjustments. Pick up something short compared to the time. From the picked-up second condition satisfaction adjustment, the absolute condition satisfaction adjustment and the simultaneous execution are determined, and the first condition satisfaction adjustment and the simultaneously executable one are determined.

  And the control apparatus 70 performs the determined adjustment simultaneously.

(Case K)
Case K has a plurality of first condition establishment adjustments, a plurality of second condition establishment adjustments, and a plurality of first condition establishment adjustments simultaneously when an adjustment that satisfies the absolute execution condition is executed. This is a case in which some adjustments among the plurality of second condition satisfaction adjustments cannot be executed simultaneously.

  In this case, as the control corresponding to case K, first, the control device 70 determines to simultaneously execute a plurality of first condition establishment adjustments that can be executed simultaneously with the absolute condition establishment adjustment.

  Next, the control device 70 separates those that can be executed simultaneously only in the plurality of second condition satisfaction adjustments from those that cannot be executed simultaneously.

  Subsequently, the control device 70 picks up one adjustment of the longest necessary time from the sorted second condition satisfaction adjustments that cannot be executed simultaneously. Subsequently, the first time in which the necessary time is determined to be executed simultaneously with the time required for the absolute condition satisfaction adjustment from among the sorted second condition satisfaction adjustment that can be executed simultaneously and the one second condition satisfaction adjustment that has been picked up. A thing shorter than the longest time of the necessary time for condition establishment adjustment is further picked up. Further, from the picked-up second condition satisfaction adjustments, it is determined to simultaneously execute the first condition satisfaction adjustment for which absolute condition satisfaction adjustment and simultaneous execution have been determined, and those that can be executed simultaneously.

  And the control apparatus 70 performs the determined adjustment simultaneously.

(Case L)
Case L includes a plurality of first condition establishment adjustments, a plurality of second condition establishment adjustments, and a plurality of first condition establishment adjustments when an adjustment that satisfies the absolute execution condition is executed. In this case, some adjustments cannot be executed simultaneously, and a plurality of second condition satisfaction adjustments can be executed simultaneously.

  In this case, as the control corresponding to the case L, the control device 70 first classifies the control that can be executed simultaneously only within the plurality of first condition establishment adjustments and the control that cannot be executed simultaneously. Next, one longest necessary time adjustment is picked up from the sorted first condition satisfaction adjustments that cannot be executed simultaneously. Subsequently, it is determined to simultaneously execute those that can be executed simultaneously with the absolute condition establishment adjustment from among the sorted first condition establishment adjustment that can be executed simultaneously and one picked up first condition establishment adjustment.

  Further, the control device 70 has the longest required time among the plurality of second condition satisfaction adjustments, which is either the required time for the absolute condition satisfaction adjustment or the required time for the first condition satisfaction adjustment for which simultaneous execution is determined. Pick things that are shorter than time. From the picked-up second condition satisfaction adjustments, it is determined that the absolute condition satisfaction adjustment and the first condition satisfaction adjustment for which simultaneous execution has been determined and those that can be executed simultaneously are executed simultaneously.

  And the control apparatus 70 performs the determined adjustment simultaneously.

(Case M)
Case M includes a plurality of first condition satisfaction adjustments, a plurality of second condition satisfaction adjustments, and a plurality of first condition satisfaction adjustments when an adjustment that satisfies the absolute execution condition is executed. In this case, some adjustments cannot be executed simultaneously, and some adjustments among the plurality of second condition satisfaction adjustments cannot be executed simultaneously.

  In this case, as the control corresponding to the case M, the control device 70 first classifies the control that can be executed simultaneously only in the plurality of first condition establishment adjustments and the control that cannot be executed simultaneously. Next, one longest necessary time adjustment is picked up from the sorted first condition satisfaction adjustments that cannot be executed simultaneously. Subsequently, it is determined to simultaneously execute those that can be executed simultaneously with the absolute condition establishment adjustment from among the sorted first condition establishment adjustment that can be executed simultaneously and one picked up first condition establishment adjustment.

  Furthermore, the control device 70 separates those that can be executed simultaneously only in the plurality of second condition satisfaction adjustments from those that cannot be executed simultaneously.

  Subsequently, the control device 70 picks up one adjustment of the longest necessary time from the sorted second condition satisfaction adjustments that cannot be executed simultaneously. Subsequently, the first time in which the necessary time is determined to be executed simultaneously with the time required for the absolute condition satisfaction adjustment from among the sorted second condition satisfaction adjustment that can be executed simultaneously and the one second condition satisfaction adjustment that has been picked up. A thing shorter than the longest time of the necessary time for condition establishment adjustment is further picked up. Further, from the picked-up second condition satisfaction adjustments, it is determined to simultaneously execute the first condition satisfaction adjustment for which absolute condition satisfaction adjustment and simultaneous execution have been determined, and those that can be executed simultaneously.

  And the control apparatus 70 performs the determined adjustment simultaneously.

  The control of the control device 70 corresponding to each of the 13 cases has been described above. Next, a control flow of the control device 70 for determining which control is executed will be described with reference to flowcharts shown in FIGS. These figures show the flow of control that is started when execution of at least one adjustment that satisfies the absolute execution condition is confirmed.

  As shown in FIG. 6, the control device 70 first determines in step S100 whether there is an adjustment that satisfies the first simultaneous execution condition. If it exists, the process proceeds to step S110; otherwise, the process proceeds to return and returns to the start (this corresponds to case A).

  In step S110, the control device 70 determines whether or not there are a plurality of adjustments that satisfy the first simultaneous execution condition, in other words, at least two or one. If there are more than one, the process proceeds to step S120. Otherwise, the process proceeds to step S200 in FIG.

  In step S120, the control device 70 determines whether or not a plurality of adjustments satisfying the first simultaneous execution condition can be executed simultaneously, in other words, whether or not a plurality of adjustments can be executed simultaneously, or a part of them. It is determined whether or not the adjustments can be executed simultaneously. If a plurality of adjustments can be performed simultaneously, the process proceeds to step S130. Otherwise, if some adjustments cannot be performed simultaneously, the process proceeds to step S300 in FIG.

  In step S130, the control device 70 determines whether or not there is an adjustment that satisfies the second simultaneous execution condition. If it exists, the process proceeds to step S140. Otherwise, the process proceeds to step S190.

  In step S140, the control device 70 determines whether or not there are a plurality of adjustments for which the second simultaneous execution condition is satisfied, in other words, at least two or one. If there are more than one, the process proceeds to step S150. Otherwise, the process proceeds to step S180.

  In step S150, the control device 70 determines whether or not a plurality of adjustments satisfying the second simultaneous execution condition can be executed simultaneously, in other words, whether or not a plurality of adjustments can be executed simultaneously or a part of them. It is determined whether or not the adjustments can be executed simultaneously. If a plurality of adjustments can be performed simultaneously, the process proceeds to step S160. Otherwise, if some adjustments cannot be performed simultaneously, the process proceeds to step S170.

  In step S160, the control device 70 executes control corresponding to the case J described above. Then proceed to return and return to start.

  In step S170, the control device 70 executes control corresponding to the case K described above. Then proceed to return and return to start.

  In step S180, the control device 70 executes control corresponding to the case H described above. Then proceed to return and return to start.

  In step S190, the control device 70 executes control corresponding to the case F described above. Then proceed to return and return to start.

  On the other hand, if it is determined in step S110 that there are not a plurality of adjustments for which the first simultaneous execution condition is satisfied, the control device 70 satisfies only the second simultaneous execution condition in step S200 shown in FIG. It is determined whether there is an adjustment. When it exists, it progresses to step S210. Otherwise, the process proceeds to step S260.

  In step S210, the control device 70 determines whether or not there are a plurality of adjustments that satisfy the second simultaneous execution condition, in other words, at least two or one. If there are more than one, the process proceeds to step S220. Otherwise, the process proceeds to step S250.

  In step S220, the control device 70 determines whether or not a plurality of adjustments satisfying the second simultaneous execution condition can be executed simultaneously, in other words, whether or not a plurality of adjustments can be executed simultaneously, or a part of them. It is determined whether or not the adjustments can be executed simultaneously. If a plurality of adjustments can be performed simultaneously, the process proceeds to step S230. Otherwise, if some adjustments cannot be performed simultaneously, the process proceeds to step S240.

  In step S230, the control device 70 executes control corresponding to the case D described above. Then proceed to return and return to start.

  In step S240, the control device 70 executes control corresponding to the case E described above. Then proceed to return and return to start.

  In step S250, the control device 70 executes control corresponding to the case C described above. Then proceed to return and return to start.

  In step S260, the control device 70 executes control corresponding to the case B described above. Then proceed to return and return to start.

  Returning to FIG. 6, on the other hand, it is determined in step S120 that a plurality of adjustments for which the first simultaneous execution condition is satisfied cannot be executed simultaneously, in other words, some adjustments cannot be executed simultaneously. In this case, the control device 70 determines whether or not there is an adjustment that satisfies only the second simultaneous execution condition in step S300 shown in FIG. When it exists, it progresses to step S310. Otherwise, the process proceeds to step S360.

  In step S310, the control device 70 determines whether or not there are a plurality of adjustments that satisfy the second simultaneous execution condition, in other words, at least two or one. If there are more than one, the process proceeds to step S320. Otherwise, the process proceeds to step S350.

  In step S320, the control device 70 determines whether or not a plurality of adjustments satisfying the second simultaneous execution condition can be executed simultaneously, in other words, whether or not a plurality of adjustments can be executed simultaneously, or a part of them. It is determined whether or not the adjustments can be executed simultaneously. If a plurality of adjustments can be performed simultaneously, the process proceeds to step S330. Otherwise, if some adjustments cannot be performed simultaneously, the process proceeds to step S340.

  In step S330, the control device 70 executes control corresponding to the case L described above. Then proceed to return and return to start.

  In step S340, the control device 70 executes control corresponding to the case M described above. Then proceed to return and return to start.

  In step S350, the control device 70 executes control corresponding to the above-described case I. Then proceed to return and return to start.

  In step S360, the control device 70 executes control corresponding to the above-described case G. Then proceed to return and return to start.

  According to the present embodiment, when an adjustment is performed in the image forming apparatus 10 having the photosensitive member 12K, the intermediate transfer belt 20, and the secondary transfer roller 22 that are simultaneously driven by the common motor 40, the parameter is changed to the first parameter. An adjustment that has a relatively high need for execution that exceeds one threshold (the first concurrent execution condition is met) and, in some cases, the parameter is between the first and second thresholds An adjustment that has a relatively low necessity for execution (the second simultaneous execution condition is satisfied) is simultaneously executed. As a result, it is less likely that one unit is adjusted while being driven by the common motor 40 and the other units are meaninglessly driven by the motor 40. As a result, the life of each of the photosensitive member 12K, the intermediate transfer belt 20, and the secondary transfer roller 22 is prevented from being shortened wastefully.

  Further, since a plurality of adjustments are performed simultaneously as much as possible, the total operation time for adjusting the motor 40 is shortened. As a result, the life of the motor 40 is prevented from being shortened wastefully.

  From here, as a supplement, in order to better understand the effect of the present invention, an example will be given.

  FIG. 9 shows an adjustment example and a comparative example.

  The first embodiment is an example in which the absolute execution condition for the photoconductor cleaning is satisfied, the first simultaneous execution condition for the intermediate transfer belt cleaning and the secondary transfer roller cleaning is satisfied, and these adjustments are simultaneously executed. In this case, the time required for cleaning the intermediate transfer belt is 12 seconds, and other adjustments are 10 seconds. Therefore, the photosensitive member and the secondary transfer roller are meaninglessly driven for 2 seconds. In this example, the motor runs for 12 seconds.

  On the other hand, when the adjustments in the first embodiment are executed sequentially instead of simultaneously, as shown in the first comparative example, the photosensitive member and the secondary transfer roller are meaninglessly driven for 22 seconds, and the intermediate transfer belt is meaninglessly driven for 20 seconds. . The motor operates for 32 seconds.

  Comparing Example 1 and Comparative Example 1, it can be seen that meaningless driving of the unit is suppressed by performing a plurality of adjustments simultaneously.

  The second embodiment is an example in which the absolute execution condition for the photoconductor cleaning is satisfied, the first simultaneous execution condition for ATVC is satisfied, and the second simultaneous execution condition for intermediate transfer belt cleaning is satisfied. In this case, the intermediate transfer belt cleaning is not executed because the required time of 12 seconds for the intermediate transfer belt cleaning is longer than 10 seconds for the photosensitive member cleaning, which is the longest required time among the other two adjustments.

  If the intermediate transfer belt cleaning that satisfies the second simultaneous execution condition is executed as in Comparative Example 2, the photosensitive member is 2 seconds and the secondary transfer roller is 8 seconds (required time for ATVC is 4 seconds). Driven by. The motor operates for 12 seconds.

  As is clear from comparison between Example 2 and Comparative Example 2, the photosensitive member and the secondary transfer roller are driven unnecessarily for 2 seconds for the intermediate transfer belt cleaning that is less necessary to be executed. It will be. Also, the motor will operate for an extra 2 seconds.

  Therefore, the unit is meaningless by not simultaneously executing the adjustment that satisfies the second simultaneous execution condition, which requires a longer time than the adjustment that satisfies the absolute execution condition or the adjustment that satisfies the first simultaneous execution condition. It can be seen that driving is suppressed.

  In the third embodiment, when the absolute execution condition of the photosensitive member cleaning is satisfied, the first simultaneous execution condition of the intermediate transfer belt cleaning is satisfied, and the second simultaneous execution condition of the secondary transfer roller cleaning and the ATVC is satisfied. It is an example. In this case, since the secondary transfer roller cleaning and the ATVC in which the second simultaneous execution condition is satisfied cannot be executed simultaneously, the secondary transfer roller cleaning having the longest required time of 10 seconds is executed.

  If the ATVC is performed instead of the secondary transfer roller cleaning as in the comparative example 3, the secondary transfer roller is driven meaninglessly for an extra 8 seconds (the required time for ATVC is 4 seconds).

  As is clear from the comparison between Example 3 and Comparative Example 3, among the secondary transfer roller cleaning and the ATVC that satisfy the second simultaneous execution condition that cannot be executed simultaneously, the ATVC that does not require the longest time is simultaneously executed. Then, the secondary transfer roller is driven meaninglessly for an extra 6 seconds compared to the case where the secondary transfer roller cleaning having the longest required time is simultaneously performed.

  Therefore, when a plurality of adjustments satisfying the second simultaneous execution condition cannot be executed simultaneously, only the adjustment of the longest necessary time is simultaneously executed, thereby suppressing the meaningless driving of the unit. I understand.

  While the present invention has been described with reference to the above-described embodiment, the present invention is not limited to this embodiment.

  For example, in the above-described embodiment, some adjustments cannot be performed simultaneously, such as secondary transfer roller cleaning and ATVC, among a plurality of adjustments, but the present invention is not limited to this. All of the plurality of adjustments may be performed simultaneously. In this case, cases E, G, I, K, L, and M are eliminated from the plurality of cases shown in FIG. 5, and the control contents of the control device are simplified accordingly.

  In the case of the above-described embodiment, when at least two adjustments that satisfy the first simultaneous execution condition or at least two adjustments that satisfy the second simultaneous execution condition cannot be performed simultaneously, Only the adjustment with the longest necessary time is executed simultaneously with other adjustments, but the present invention is not limited to this.

  For example, as shown in FIG. 10, there are units U1 to U4, the absolute execution condition of the adjustment A1 of the unit U1 is established, and the first simultaneous execution condition of the adjustment A2 of the unit U2 and the adjustments A3a and A3b of the unit U3. And the second simultaneous execution condition of the adjustments A4a and A4b of the unit U4 is satisfied. Further, it is assumed that the adjustments A3a and A3b of the unit U3 cannot be executed simultaneously, and the adjustments A4a and A4b of the unit U4 cannot be executed simultaneously. Furthermore, it is assumed that the time required for the adjustment A1 of the unit U1 is longer than the adjustment A2 of the unit U2.

  In such a situation, when the sum of the required times of the adjustments A3a and A3b of the unit U3 is the same or shorter than the required time of the adjustment A1 of the unit U1, the adjustment A1 is executed as shown in FIG. During this time, the adjustments A3a and A3b may be executed in order. In other words, the adjustment A3a is executed simultaneously with the front portion of the adjustment A1, and the adjustment A3b is executed simultaneously with the rear portion of the adjustment A1.

  Similarly, when the sum of the required times of the adjustments A4a and A4b of the unit U4 is the same or shorter than the required time of the adjustment A1 of the unit U1, the adjustments A4a and A4b are performed while the adjustment A1 is being executed. You may perform in order.

  Finally, in the case of the above-described embodiment, the adjustment on the side to be executed simultaneously is an adjustment in which an absolute execution condition similar to the first and second simultaneous execution conditions is satisfied, but the present invention is not limited to this. . The adjustment performed at the same time may be an adjustment performed periodically. In a broad sense, the present invention determines whether or not other adjustments are executed simultaneously with the adjustment determined to be executed, and executes a plurality of adjustments simultaneously according to the determination result.

12K unit (photoconductor)
20 units (intermediate transfer belt)
22 units (secondary transfer roller)
40 Drive source (motor)

Claims (3)

In an image forming apparatus that includes a plurality of units that are simultaneously driven by a common drive source, and each unit performs adjustment while being driven by the drive source.
For each of the adjustments, a parameter that indicates the necessity of the adjustment and that is used to determine whether or not to execute simultaneously with other adjustments that are determined to be executed is set,
Adjustments where the parameter exceeds the first threshold are performed simultaneously,
Adjustments in which the parameter does not exceed a second threshold value that is smaller than the first threshold value are not performed simultaneously,
It is determined whether or not the adjustment in which the parameter is between the first threshold value and the second threshold value is performed simultaneously based on the necessary time of each of the adjustments. . The image forming apparatus according to claim 1.
The adjustment in which the parameter is between the first threshold value and the second threshold value is executed at the same time if the required time is shorter than the required time of the adjustment determined to be executed. An image forming apparatus. The image forming apparatus according to claim 2.
A plurality of adjustments in which the parameter is between the first threshold value and the second threshold value and cannot be executed simultaneously, only the adjustment with the longest required time is executed simultaneously. Image forming apparatus.

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