JP2009093121A - Image forming apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image forming apparatus with high convenience even when residual amount of developer is small to specify the number of copies for which the amount of used developer is not changed and match exchange timings for containers 10K, 10Y, 10C and 10M, etc. <P>SOLUTION: The image forming apparatus is provided with; an image forming part 6 using developers with a plurality of colors, an input part for inputting the number of copies and a mode setting, a control part 9 for controlling actions of the image forming part 6, a replenishing part for replenishing developers for each color, and a detection part 95 for detecting the residual amount of the developer. The image forming part 6 can form an image in a first mode that does not save the used amount of the developer during a color image formation or a second mode that saves the used amount of the developer for that color more than in the first mode when the residual amount of the developer is a threshold value or less. The input part receives the input of setting for an indispensable number of copies for carrying out the image formation in the first mode among the total number of copies. The control part 9 has the image formation carried out in the first mode for the indispensable number of copies and has the image formation carried out for the rest in the second mode. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an image forming apparatus such as a copying machine, a multifunction peripheral, and a printer that can form a color image using a plurality of color developers.

  2. Description of the Related Art Conventionally, in an image forming apparatus that forms an image using a developer such as toner, a device that forms a full-color image using a developer of a plurality of colors (for example, four colors of black, yellow, cyan, and magenta). Exists. The developer of each color is accommodated in a container or a cartridge, and these containers are attached to the image forming apparatus, and image formation is performed while supplying the developer from the container. Conventionally, in general, when the developer such as toner runs out during image formation, the image formation is not resumed until the image formation is stopped and the container is replaced because the original cannot be accurately reproduced. There was a problem.

Therefore, the invention described in Patent Document 1 has been proposed for such a problem. Specifically, Patent Document 1 includes two or more types of ink, a consumption amount calculating unit that calculates each ink consumption amount in the normal print mode, a remaining ink amount detecting unit, and a calculated consumption amount of each ink. And a printer comprising a printing mode selection means for selecting a mode according to the remaining amount of each ink, a printing data conversion means for an insufficient color complementary printing mode, and a printing means for executing printing in each mode. Yes. With this configuration, the occurrence of running out of ink after creation of print data is eliminated, and the inconvenience of stopping printing is attempted (see Patent Document 1: Claim 1, paragraph 0010, etc.).
JP 2004-276335 A

  According to the invention described in Patent Document 1, it seems that it is possible to prevent image formation stoppage due to running out of developer during image formation. For example, documents for customer submission, documents handled in-house as documents, etc. When there is a case where the user wants to faithfully print on the original document, the user automatically uses the missing color complement printing mode even when he / she wants to form a high-fidelity image without saving / changing the usage amount of the developer. Will be printed. Therefore, image formation is performed without reflecting the user's request, and there is a problem in terms of convenience for the user.

  In the invention described in Patent Document 1, only the print mode is automatically switched depending on the remaining amount of the developer, and only a part of the total number of copies to be printed is required to be faithful full color printing. For example, it does not reflect the user's request that it may be monochrome printing, and there is a problem in terms of convenience for the user.

  Furthermore, in the invention described in Patent Document 1, a total of eight developer inks are used (Patent Document 1: see FIG. 1 and the like), and image formation stops (can't be performed) each time each ink runs out. ), Or an out-of-ink display or the like, which is troublesome. In this respect, there is a problem in user convenience and productivity of the image forming apparatus. In addition, each time the ink runs out, it is necessary to replace the cartridge and the like, and if there are 8 colors, they are frequently replaced. This is also a problem for the convenience of the user.

  The present invention has been made in view of the above-described problems of the prior art, and allows the user to specify the number of copies that does not change the usage amount of the developer to reflect the intention of the user, and to Therefore, it is an object of the present invention to provide an image forming apparatus that is highly convenient for the user even when the replacement frequency of the container or the like is reduced and the remaining amount of the developer is reduced.

  According to a first aspect of the present invention, in an image forming apparatus having an image forming unit for forming a color image by using a plurality of color developers, the number of copies and the mode setting for image formation in the image forming unit are set in the apparatus. An input unit for inputting, a control unit for controlling the operation of the image forming unit based on the setting of the input unit, and a plurality of components configured to supply and replace each color developer to the image forming unit A replenishment unit, and a detection unit that detects a remaining amount of developer of each color in the replenishment unit, and the image forming unit does not save the amount of developer used during color image formation, and a normal image In the first mode in which formation is performed, or when the detection unit detects that the remaining amount of the developer is less than or equal to the threshold, the usage amount of the developer having a color that is less than or equal to the threshold is saved more than in the first mode. Then, image formation is performed in the second mode for image formation. In the setting of the number of copies to perform image formation, the input unit accepts setting input of the required number of copies to perform image formation in the first mode out of the total number of copies, and the control unit The image forming unit is controlled to perform image formation in the first mode and perform image formation in the second mode with respect to the other number of copies.

  According to this configuration, even when the remaining amount of the developer is reduced, the input of the required number of copies for image formation is received without reducing (saving) the usage amount of the developer among the total number of copies for image formation. Even in a state where the remaining amount of the developer is small, it is possible to perform image formation reflecting the user's request. In addition, for the number of copies other than the essential number of copies, image formation such as reducing the amount of developer used is performed, so that toner can be prevented from running out during image formation.

  According to a second aspect of the present invention, in the first aspect of the present invention, a plurality of the threshold values in the second mode are set, and the controller increases the save rate of the usage amount of the developer as the threshold value decreases. Thus, the image forming unit is controlled so that image formation is performed.

  According to this configuration, a plurality of threshold values are set, and the usage amount of the developer is reduced as the remaining amount of the developer decreases. Therefore, the usage amount of the developer can be finely adjusted by having a plurality of threshold values. . Therefore, it is possible to prevent the occurrence of running out of developer during image formation, and to improve the convenience for the user. In addition, it is possible to easily match the replacement timing of the developer container and the like with the timing at which the developer runs out.

  According to a third aspect of the present invention, in the first or second aspect of the invention, in the second mode, the detection unit detects that the remaining amount of developer of one color out of a plurality of colors is below a threshold value. In this case, the control unit saves the usage amount of the developer for the developer of the detected color, and the remaining color of the developer and the color for which the usage amount is saved for the developer of the other colors. Until the same amount is used, the current amount of developer used is maintained, and the replacement times of the plurality of supply units are made to coincide.

  According to this configuration, the developer usage amount is adjusted by maintaining the current developer usage amount until the remaining amount of the developer is the same as the color for which the usage amount is saved. The timing at which the developer finally runs out can be adjusted. Therefore, it is possible to make the replacement timings of the developer containers and the like coincide with each other, and it is possible to replace a plurality of containers and the like at a time, and it is possible to reduce the amount of work required to replace the user's containers and the like as compared with the conventional case. That is, the convenience of the user can be improved in exchanging containers and the like.

  In the invention according to claim 4, in the invention according to claim 3, when the color of the developer used by the image forming unit includes yellow, the one color developer does not include yellow. It was.

  According to this configuration, generally, yellow may consume less developer than other colors. Further, it is difficult to see even when text or the like is printed with yellow, and since only yellow is rarely used for monochromatic printing, the consumption of the developer may be further reduced as compared with other developers. Therefore, it is possible to prevent the replacement timing of the containers of other colors from matching the replacement timing of the yellow container or the like.

  According to a fifth aspect of the present invention, in the first to fourth aspects of the invention, the image forming unit can perform image formation in a third mode in which image formation is performed using only a single color developer. When the detection unit detects that the developer running out of any color is detected during image formation, and the job being executed is not related to the required number of copies, the control unit causes the developer running out. The image forming unit is controlled so as to continue image formation in the third mode using a developer of a color that is not used.

  According to this configuration, even when the amount of developer used is adjusted and the replacement timing of containers and the like is matched, the relationship between the required number of copies and when the developer runs out during mass image formation There is. Even in that case, it is possible to prevent the image formation from being stopped by continuing at least monochrome printing. Conventionally, when image formation is stopped due to running out of developer, the state is left unattended by the user, and even monochrome printing (for example, black document) is performed until the container is replaced. However, productivity and convenience have been impaired, but the present invention can eliminate such disadvantages.

  According to a sixth aspect of the present invention, there is provided an output unit for transmitting information to a user according to the first to fourth aspects of the present invention, wherein the image forming unit forms an image using only a single color developer. It is possible to perform image formation in the third mode to be performed, and when the detection unit detects that the developer of any color has run out during color image formation, the job being executed is set to the required number of copies. In such a case, the control unit controls the image forming unit so as to continue image formation in the third mode using a developer of a color that does not cause the developer to run out, and outputs to the output unit. Information on the number of copies of the required number of copies that are not image-formed is output.

  According to this configuration, even when the amount of developer used is adjusted and the replacement timing of containers and the like is matched, the relationship between the required number of copies and when the developer runs out during mass image formation There is. Even in that case, it is possible to prevent the image formation from being stopped by continuing at least monochrome printing. In addition, among the essential copies, the number of copies that had to be printed in a single color can be transmitted to the user, and the user can easily check the printing status. Therefore, a highly convenient image forming apparatus can be provided.

  According to a seventh aspect of the present invention, in the sixth aspect of the invention, the output unit is configured to supply the developer remaining in the replenishing unit, the developer running out, and the replenishing unit having a small amount of developer and having a short replacement time. It was decided to output information indicating

  According to this structure, the user can grasp | ascertain replacement | exchange time of a container etc. based on the information from an output part. On the other hand, it is possible to grasp the color of the developer where the developer remains sufficiently. Therefore, for example, it is possible to transmit information in consideration of convenience for the user, such as preferentially using a developer having a color in which sufficient developer remains.

  According to an eighth aspect of the present invention, in the first to seventh aspects of the present invention, the developer used by the image forming unit and replenished by the replenishing unit is four colors of black, yellow, cyan, and magenta. did.

  This configuration specifically shows the color of the toner when toner is used as a developer when full-color image formation is performed, and represents one preferred embodiment.

  According to a ninth aspect of the invention, in the eighth aspect of the invention, the control unit forms an image in the third mode when the detection unit detects that the developer of one of the colors has run out during color image formation. In the third mode, image formation is performed using black developer preferentially, and when black developer runs out, image formation is performed using cyan or magenta developer. Therefore, the image forming unit is controlled not to use the yellow developer.

  According to this configuration, in monochromatic printing, image formation is most preferably performed in black, and the formed image is easily visible. Therefore, in monochromatic printing, black developer is preferentially performed. On the other hand, when the black developer has run out, it is difficult to visually recognize a yellow single-color printed image. Therefore, by forming an image using a color other than yellow, the visibility of the formed image is improved. Can be secured. Accordingly, it is possible to provide an image forming apparatus capable of forming an easy-to-see image even when the developer runs out.

  According to a tenth aspect of the present invention, in the fifth to ninth aspects of the present invention, the input unit changes the setting of the save rate of the developer usage amount at the threshold value in the second mode, or the third mode. The setting of the developer used for image formation is received, and the control unit controls the image forming unit based on the setting input to the input unit.

  According to this configuration, since the user can set the second mode and the third mode, it is possible to provide an image forming apparatus that is highly user-friendly and highly convenient.

  As described above, according to the present invention, the user can designate the number of copies that does not change the usage amount of the developer, and the user's intention is preferentially reflected, so the convenience of the user is high. Further, since the replacement timing of the containers and the like is made coincident, it is highly convenient for the user in terms of reducing the replacement frequency of the containers and the like. Therefore, a highly convenient image forming apparatus can be provided.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. However, each element such as configuration and arrangement described in each embodiment does not limit the scope of the invention and is merely an illustrative example.

  First, an outline of a multifunction peripheral 1 (corresponding to an image forming apparatus) according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a system configuration diagram of a multifunction machine 1 according to an embodiment of the present invention, and FIG. 2 is a schematic front sectional view of the multifunction machine 1 according to an embodiment of the present invention. FIG. 3 is a partially enlarged schematic cross-sectional view of the image forming unit 61 of the multifunction machine 1 according to the embodiment of the present invention.

  As shown in FIG. 1, the multi-function device 1 according to the present embodiment is connected to a user terminal 100 (for example, a personal computer) via a network and an interface. Each user transmits image data to be image-formed from each user terminal 100 to the multi-function device 1, and in response to this, the multi-function device 1 forms an image (printer function). When using this printer function, a printer driver program is installed in the HDD (not shown) of the user terminal 100 in order to transmit data to the multifunction device 1 and perform various settings.

  The multifunction machine 1 has a document reading unit 3 (details will be described later) for reading a document placed on the contact glass 31, and image formation is performed based on image data read by the document reading unit 3. It is also possible to do this.

  Next, based on FIG. 2, a detailed configuration of the multifunction machine 1 of the present embodiment will be described.

  The multifunction device 1 according to the present embodiment forms an image on a sheet based on image data obtained by reading a document or image data transmitted from the user terminal 100. As shown in FIG. 2, the multifunction machine 1 is provided with a document cover 2a for holding a document from above, and a document reading unit 3 and a sheet supply unit 4 are provided in the lower copying machine body. , A sheet conveyance path 5, an image forming unit 6, and the like. Each image forming unit 61 in the image forming unit 6 will be described separately with reference to FIG.

  The original reading unit 3 reads an original and forms image data of the read original. An exposure lamp, a reflector, a mirror, a lens, a CCD sensor, etc. (all not shown) are provided in the document reading unit 3 to optically scan the document and generate image data. Further, a contact glass 31 is provided on the upper surface of the document reading unit 3, and the document on the contact glass 31 is scanned and read to generate image data.

  The document cover 2 a that holds the document has a fulcrum on the back side of the sheet of FIG. 2 and is configured to be opened and closed in the vertical direction. The document cover 2 a presses the document so as to sandwich the contact glass 31. In addition, it is also possible to continuously read the original by scanning the original conveyed so as to contact the feeding reading contact glass 31a by an automatic document feeder (not shown) separately prepared as an option.

  The sheet supply unit 4 includes a cassette 41 in which sheets such as sheets of various sizes are stored, a pickup roller 42 that feeds the sheets from the cassette 41 to the sheet conveyance path 5 one by one. For example, when an input for image formation is input to the multi-function device 1, the pickup roller 42 is rotationally driven, and the sheets are sent out to the sheet conveyance path 5 one by one.

  The sheet conveyance path 5 conveys the sheet supplied from the sheet supply unit 4 from the sheet supply unit 4 toward the discharge tray 51. Therefore, the sheet conveying path 5 is provided with a plurality of conveying roller pairs 52, a guide plate for guiding the sheet conveying direction, and the like.

  The image forming unit 6 is a portion that forms a toner image of an image to be formed, and can perform color image formation using a plurality of color developers. For example, the image forming unit 6 can be composed of a plurality of image forming units 61 that form color toner images. Then, an image is formed on the sheet using an intermediate transfer unit 7 that transfers the formed toner image to the sheet, a fixing unit 8 that fixes the toner image transferred to the sheet, and the like.

  Therefore, the image forming unit 61 will be described with reference to FIG.

  The image forming unit 61 is arranged in parallel in the left-right direction of the multi-function device 1 (tandem), and in order from the left in FIG. 2 according to the color of the toner image to be formed, four image forming units 61K (black), 61Y ( Yellow), 61C (cyan), and 61M (magenta). By appropriately superimposing these four color toners, the multi-function device 1 of the present embodiment can form a full-color image. Although each image forming unit 61 uses different toner, the basic configuration is the same, and therefore, the symbols K, Y, C, and M are omitted in the following description unless otherwise specified (FIG. 3). The same).

  As shown in FIG. 3, each image forming unit 61 includes a photosensitive drum 62 rotatably supported in the direction of the arrow shown in the figure, a charging device 63 disposed around the photosensitive drum 62, and an exposure device. 64 (one for each image forming unit 61), a developing device 65, and a cleaning device 66.

  The photosensitive drum 62 is rotationally driven in a predetermined direction. The charging device 63 is provided below the photosensitive drum 62 and uniformly charges the surface of the photosensitive drum 62 to a predetermined potential. The exposure device 64 is provided below the charging device 63, and directs the light L to each photosensitive drum 62 based on image data formed by the document reading unit 3, image data transmitted from the external user terminal 100, or the like. Are output, scanned and exposed to form an electrostatic latent image corresponding to the image data.

  The developing device 65 is provided on the right side of the photoconductive drum 62, and develops (visualizes) an electrostatic latent image by supplying toner charged to a predetermined potential. Therefore, the multifunction peripheral 1 of the present embodiment uses a developer containing toner as the developer. Then, the toner is charged to a predetermined potential, and the toner newly supplied from the containers 10K, 10Y, 10C, and 10M (see FIG. 4) in the developing device 65 and the toner in the developing device 65 are mixed. A stirring member 65a that stirs with a fin or the like while conveying toner in the direction perpendicular to the paper surface of FIG. 3 is provided, and a developing roller 65b that carries a thin layer of toner is provided on the upper left of the stirring member 65a. Toner is supplied from the developing roller 65 b toward the photosensitive drum 62. The developed toner image is primary-transferred superimposed on the intermediate transfer belt 71, and the cleaning device 66 cleans the surface of the photosensitive drum 62 after the primary transfer.

  Next, returning to FIG. 2, the intermediate transfer unit 7 and the fixing unit 8 will be described.

  The intermediate transfer unit 7 is provided above each image forming unit 61 and receives a primary transfer of a toner image from the photosensitive drum 62 and performs a secondary transfer onto a sheet. The intermediate transfer belt 71 that constitutes the intermediate transfer unit 7 has four driving rollers 72, a driven roller 73, and four primary transfer units so that each photosensitive drum 62 is in contact with the lower outer peripheral surface of the intermediate transfer belt 71. The roller 74 is stretched. Here, driving means (not shown) including a motor, a gear, and the like is connected to the driving roller 72, and the intermediate transfer belt 71 rotates in the clockwise direction (arrow direction) in FIG. 1 by driving the driving roller 72.

  Further, the primary transfer rollers 74 are rotatably arranged one by one at positions where they contact each photosensitive drum 62 via the intermediate transfer belt 71. A voltage having a polarity opposite to the charging polarity of the toner is applied to the primary transfer roller 74 at a predetermined magnitude and the toner image of each color is superimposed on the intermediate transfer belt 71 from the photosensitive drum 62 while being superimposed on the intermediate transfer belt 71. Next transfer is performed, and one full-color toner image is formed on the intermediate transfer belt 71. The toner image transferred to the intermediate transfer belt 71 contacts the driving roller 72 via the intermediate transfer belt 71 and is secondarily transferred to the sheet by a secondary transfer roller 75 that is rotatably supported. The secondary transfer roller 75 is connected to a power source (not shown) and applies a predetermined voltage when a sheet and a toner image enter a secondary transfer portion (nip between the secondary transfer roller 75 and the intermediate transfer belt 71). Applied. The belt cleaning device 76 removes residual toner or the like that has not been transferred to the sheet from the intermediate transfer belt 71.

  The fixing unit 8 fixes the toner image transferred to the sheet. The fixing unit 8 in this embodiment is mainly composed of a heating roller 81 and a pressure roller 82 in pressure contact with the heating roller 81. The heating roller 81 has a built-in heat generation source. When the toner image passes through the nip between the heating roller 81 and the pressure roller 82, the toner is melted and heated, and the toner image is fixed on the sheet. Then, the sheet on which image formation has been completed is discharged to the discharge tray 51.

  Next, toner replenishment of the multifunction machine 1 according to the embodiment of the present invention will be described with reference to FIG. FIG. 4 is a perspective view of the multifunction machine 1 according to the embodiment of the present invention.

  As shown in FIG. 4, when the front cover 2b of the multifunction device 1 is opened, four containers 10K, 10Y, 10C for supplying toner of each color in the order of black, yellow, cyan, and magenta from the left side of FIG. 10M (corresponding to a replenishment unit) is attached to the multifunction device 1. Each container 10 is connected to each developing device 65, and toner is supplied from each container 10 to each developing device 65. That is, each container 10 is configured to be replaceable by supplying developer of each color to the image forming unit 6. Note that since the amount of black toner used is generally the largest, the black container 10K is larger than the other colors. Each container 10 is detachable, and is replaced when the developer in each container 10 runs out.

  Here, the operation panel 11 provided on the upper front side of the multifunction machine 1 will also be described.

  As shown in FIG. 4, the operation panel 11 is provided above the front surface of the multifunction machine 11 and includes various keys for input and setting such as a numeric keypad 12 and a start key 13. As shown in FIG. 2, the operation panel 11 includes a liquid crystal display unit 14 that displays an operation state of the apparatus and various messages, and can perform various settings, mode selections, and the like using a touch panel. For example, in order to make full use of various functions of the multifunction device 1 by selecting and setting the copy, scanner, printer, and FAX functions of the multifunction device 1, the user operates and sets the operation of the multifunction device 1 from the operation panel 11. Is possible.

  In the multi-function device 1 according to the present embodiment, as will be described in detail later, when color (full color) image formation is performed, a full color image forming mode is performed in which normal color image formation is performed without saving the amount of toner used for each color. A mode (corresponding to the first mode) can be selected, and a toner save mode (corresponding to the second mode), which is a mode for forming a color image while adjusting the amount of toner used when the remaining amount is low, can be selected. It is. It is also possible to select a mono color mode (corresponding to the third mode) that specifies image formation in a single color. That is, each mode can be selected from the operation panel 11.

  Next, based on FIG. 5, the full color mode, the toner save mode, and the mono color mode in the multifunction machine 1 according to the embodiment of the present invention will be described in more detail. FIG. 5 is a diagram illustrating an example of mode setting of the multifunction machine 1 according to the embodiment of the present invention.

  The multi-function device 1 of the present embodiment can set a plurality of print modes. Specifically, a display (window 15) as shown in FIG. 5 is displayed on, for example, the liquid crystal display unit 14 of the operation panel 11 or It is displayed on the display of the user terminal 100 by the printer driver software.

  The printer name display field 16 in the window 15 is selected from the image forming apparatus such as the multifunction machine 1 arranged at the top and connected to the network to which the user terminal 100 belongs. This is a display field indicating that the printer is in a state, and displays a specific printer name for each network and connection. In the liquid crystal display unit 14, the printer name display column 16 is not necessary, so this column is not displayed.

  The print copy number column 17 is arranged below the printer name display column 16 and is a portion for instructing / inputting the total number of image formations to be performed by the multifunction device 1. A user performs input using the mouse, keyboard, or the like on the user terminal 100, and inputs using the numeric keypad 12 or the like on the operation panel 11 on the liquid crystal display unit 14. When the copy function of the multifunction device 1 is used, it is only necessary to continuously read the originals and set the number of copies with a part of the total number of originals read. The total number of copies is a job to be executed by the multifunction device 1.

  The print mode check box 18 is arranged below the print number column 17 and is a box for selecting each mode of full color, toner save, and mono color. The user terminal 100 may perform mode selection using a mouse or the like, and the liquid crystal display unit 14 may perform mode selection by a touch panel method. When selecting the toner save mode, the user selects the check box to the left of the characters “Full Color & Toner Save” in FIG.

  Here, the details of each mode will be described. In the full color mode (first mode), the toner remaining in each container 10 during color image formation (when all four colors are used to form an image) is used. In this mode, image formation is performed without saving the amount of toner used regardless of the amount. That is, this mode faithfully reproduces the original based on the image data to be the original. For example, it is selected when the user demands the fidelity of the manuscript, such as when using it as an official document such as a customer document or a document attached to a settlement document. Not saved automatically.

  On the other hand, the toner save mode (second mode) is a mode in which when the remaining amount of toner in the containers 10K, 10Y, 10C, and 10M decreases, the amount of toner used for that color is saved to form an image. In other words, when the detection unit 95 detects that the remaining amount of toner is equal to or less than the threshold, the amount of toner used for the color that is equal to or less than the threshold is saved as compared with the first mode to perform image formation. Here, in the toner save mode in the MFP 1 of the present embodiment, the number of copies to be printed in the full color mode can be set out of the total number of copies to be printed (hereinafter, this number of copies is referred to as “essential number of copies”). A column for inputting the required number of copies is the required number of copies input column 18a (in FIG. 5, 3 copies are the required number of copies in the total number of 10 copies). Therefore, the toner save mode is not applied to all image formation, and even when the remaining amount of toner is low, the number of copies for image formation in the full color mode can be set, and the convenience and flexibility for the user are high. When image formation is performed only in the toner save mode, 0 (zero) is input in the required number of copies input field 18a or is not input. Conventionally, there has been a mode called a toner save mode, but the conventional one is for reducing the amount of toner used uniformly, and is different from the toner save mode in the present invention.

  The number of copies other than the essential number of copies is formed in the toner save mode. Therefore, all jobs are divided into jobs that are printed in the full color mode and jobs that are printed in the toner save mode. That is, the operation panel 11 and the like accept setting input of the required number of copies for image formation in the full color mode out of the total number of copies for setting the number of copies for image formation, and the control section 9 (see FIG. 6) The image formation is performed in the full color mode, and for the other number of copies, the image formation unit 6 is caused to perform the image formation in the toner save mode.

  On the other hand, the mono color mode (corresponding to the third mode) is shown in FIG. The mono color mode is a mode in which the image forming unit 6 forms an image using only a single color toner. Three color selection check boxes 19 are provided in order to set a color to be used in the mono color mode. In addition, since it is difficult to see the printed matter of only yellow, the color selection check box 19 for selecting yellow is not displayed.

  In this mono color mode, for example, it is possible to select a color to be used while checking the remaining amount of toner in each container 10 such as printing in a single color with a color in which the toner remains most in each container 10. Also good. The toner remaining amount in each container 10 may be confirmed by causing the control unit 9 to output information from the detection unit 95 to the liquid crystal display unit 14 of the operation panel 11 or the display of the user terminal 100.

  Next, based on FIG. 6, the control of the multifunction machine 1 according to the embodiment of the present invention will be described. FIG. 6 is a block diagram for explaining the control of the multifunction peripheral 1 according to the embodiment of the present invention.

  As shown in FIG. 6, the multifunction machine 1 according to the present embodiment includes a control unit 9 provided on a control board that is appropriately arranged in the machine. The control unit 9 controls the operation of the entire copying machine, such as controlling the operation of the image forming unit 6 based on the input and setting from the operation panel 11 and the I / F unit 94. For this reason, the control unit 9 The reading unit 3, the intermediate transfer unit 7, the image forming unit 61, the fixing unit 8 and the like are connected by a signal line or the like. For example, the control unit 9 includes a CPU 91, a storage unit 92, an image processing unit 93, an I / F unit 94 (interface unit), and the like, and appropriately forms an image based on a control program and data developed in the storage unit 92. The operation of each unit is controlled so that

  The CPU 91 is a central processing unit, and controls and performs each part of the copier based on a control program stored in the ROM or HDD of the storage unit 92 and developed in the RAM. The storage unit 92 stores control programs and various data, and includes a memory such as a ROM, a RAM, and an HDD. The ROM stores a copy machine control program and control data, and is used when the CPU 91 reads the control program. The RAM is used for temporarily expanding a control program or the like, or for temporarily storing image data. The HDD is a large-capacity storage device, and is used for storing control programs, control data, image data scanned by the document reading unit 3, and setting information of a copying machine by a user. .

  The image processing unit 93 performs image data for image formation such as image data read by the document reading unit 3, image data transmitted from the user terminal 100, and image data (facsimile function) transmitted from the counterpart FAX apparatus 200. This is a part that decomposes the image data of each color of black, yellow, cyan, and magenta and performs image processing on the image data of each color. In addition to the CPU 91 and the memory of the control unit 9, the image processing unit 93 may be separately provided with a CPU and a memory dedicated to image processing to increase the processing speed. The scanner function is realized by transmitting the image data of the document read by the document reading unit 3 to the user terminal 100 after image processing or storing it in the HDD.

  Here, the toner save mode and the mono-color mode described above are realized by performing image processing on image data, so that point will be mentioned.

  Further, when the toner save mode or the mono color mode is selected, the image processing unit 93 performs image processing for each mode on the image data of each color. The toner save mode according to the present embodiment is different from the conventional method in which the toner usage amount of all colors is reduced, and saves (decreases) the toner usage amount of the color having a small remaining amount in each container 10. There are features. In the toner save mode of the present embodiment, the image processing unit 93 implements the toner save mode by thinning out the dots on which toner is to be applied to the image data of the color that saves the toner usage amount. For example, if the number of dots on which toner is evenly applied per page is halved, 50% of the amount of toner used can be saved, and if the number of dots is ¼, the amount of toner used can be saved 25%. On the other hand, in the mono color mode, the image processing unit 93 is realized by converting all the image data of each color into the same color and combining them.

  Then, the control unit 9 outputs the processed image data to each exposure device 64, and the exposure device 64 performs scanning / exposure based on the image data. As a result, a toner image with a reduced amount of toner used is formed on the photosensitive drum 62 in the toner save mode, and a single color toner image is formed in the mono color mode.

  Further, as shown in FIG. 6, as an input unit for instructing / inputting to the multi function device 1, the job execution result and error display, the remaining amount of toner in each container 10, the toner running out, the remaining An operation panel connected to the control unit 9 is connected to the multifunction device 1 as an output unit that outputs information indicating the container 10 whose amount is short and the replacement time is near, and information for transmitting the replacement time of each container to the user. 11 (see FIG. 4) and an I / F unit 94 are provided. Specifically, the operation panel 11 functions as an input unit that receives a setting input related to image formation from the user and transmits it to the control unit 9, and outputs and displays the information from the control unit 9 on the liquid crystal display unit 14. Functions as an output unit.

  The I / F unit 94 functions as an input unit that receives a setting input related to image formation transmitted from each user terminal 100 and transmits it to the control unit 9, and also provides data related to the above information to each user terminal 100. Functions as an output unit. That is, the operation panel 11 and the I / F unit 94 are input units for inputting the number of copies and the mode setting for image formation in the image forming unit 6 to the apparatus, and for transmitting information to the user. It is also the output part.

  Further, the control unit 9 is connected to a detection unit 95 for confirming and detecting the remaining amount of developer in each container 10. The detection unit 95 is connected to a remaining amount detection sensor 96 provided in each container 10. Each remaining amount detection sensor 96 is composed of, for example, an optical sensor, and outputs an analog signal according to the remaining amount of toner in each container 10 (for example, a voltage value corresponding to the remaining amount of developer). The detection unit 95 amplifies the analog signal and converts it into a digital signal, and outputs the remaining amount of developer in each container 10 to the control unit 9. Upon receiving this output, the control unit 9 checks the remaining amount of toner in each container 10.

  Next, based on FIG. 7, a basic operation flow of color image formation in the image formation of the multifunction machine 1 according to the embodiment of the present invention will be described. FIG. 7 is a flowchart for explaining an example of the color image forming operation of the multifunction machine 1 according to the embodiment of the present invention.

  The start in FIG. 7 is when the input indicating that color image formation should be performed is made to the multifunction device 1 and the control unit 9 confirms the contents set and input to the user terminal 100 and the operation panel 11. Next, the control unit 9 confirms the outputs of the remaining amount detection sensors 96 and the detection unit 95 in each container 10 and confirms whether there is any toner remaining below a threshold value (details will be described later) (step #). 1). If there is no container 10 in which the remaining amount of toner is below the threshold (hereinafter, this state is referred to as “toner low”) (Yes in step # 2), printing is performed without reducing the amount of toner used (step # 3). ). When the completion of printing of one copy is confirmed (step # 4), the control unit 9 confirms whether image formation is completed for all jobs (total number), and when all image formation is completed (step #). 5), this processing is ended. On the other hand, if all image formation has not been completed (No in step # 5), the remaining amount of toner in each container 10 is confirmed again (return to step # 1). This is because a toner low state may occur during image formation.

  In step # 2, if there is a toner-low one in each container 10 (No in step # 2), the control unit 9 executes the required number of copies in the full color mode or in the toner save mode. If it is in the middle, it is confirmed whether image formation should be performed without reducing the amount of toner used. If the amount of toner used is not decreased (step # 6) (Yes in step # 6), the process proceeds to step # 3, and printing is performed in the full color mode regardless of the remaining amount of toner. On the other hand, if printing in the full color mode is not essential (No in step # 6), the toner usage amount of the toner low color is saved in the toner save mode to form an image (step # 7). Thereafter, the process proceeds to step # 4, and the process is continued until all jobs are completed.

  Here, in the MFP 1 of the present embodiment, whether or not the toner usage is reduced first reflects the user's intention even in the toner low state. In addition, in order to check the toner low state of each container 10 every time one copy is completed, when a large number of copies are formed continuously, the toner is in the full color mode even though the toner low state is entered. Will not continue to consume in the same state.

  Next, an example of control when any toner in each container 10 runs out during color image formation will be described with reference to FIG. FIG. 8 is a flowchart showing the flow of processing when toner runs out during color image formation in the multifunction machine 1 according to the embodiment of the present invention.

  The start in FIG. 8 is unavoidably during the formation of a color image, and the toner has run out. If toner runs out during image formation, the controller 9 first checks whether black toner is present (step # 11). If the black toner has not run out (No in step # 11), image formation of that portion is performed in black (step # 12). On the other hand, if the black toner has run out (Yes in step # 11), the control unit 9 confirms the presence or absence of cyan or magenta toner (step # 13). If the cyan or magenta toner has not run out (Yes in step # 13), image formation for that portion is performed in cyan or magenta (step # 14). Either cyan or magenta may be used. For example, a color having a large amount of remaining toner may be automatically selected to form an image.

  However, if the cyan and magenta toners have also run out (No in step # 13), image formation is stopped (step # 15), and the replacement of toner out of each container 10 is awaited (step # 16). Note that yellow monochromatic printing is not performed so that an easy-to-read image is formed. That is, when the control unit 9 detects that the developer of any color has run out during color image formation and performs image formation in the mono color mode, the control unit 9 preferentially uses black toner. When the black toner runs out, the image is formed using cyan or magenta toner, and in the mono color mode, the image forming unit 6 is controlled not to use yellow toner. To do. Thereafter, if the toner out of each container 10 is replaced, the toner does not run out, so the processing in FIG. 8 is ended.

  When image formation is performed with any one color of black, cyan, and magenta, the control unit 9 checks whether or not that part corresponds to the required number of copies (step # 17), and if it corresponds to the required number of copies (step # 17). In step # 17, Yes), +1 is added to the count of the number of copies that are essential, but the image is formed in a single color, and is stored in the RAM or the like (step # 18). After that, or when the number of required copies is not met (No in Step # 17), it is confirmed whether all image formation is completed (Step # 19). If all image formation is not completed, printing of another copy is performed. To return to step # 1. On the other hand, when the image formation of all the copies is completed, the control unit 9 performs an output to display the cumulative number of the single-color printed copies on the liquid crystal display unit 14 of the operation panel 11 although it is an essential number of copies, or The accumulated number of data is output from the I / F unit 94 to the user terminal 100 (step # 20). Thereby, the user can confirm and is highly convenient.

  That is, when the detection unit 95 detects that one of the colors of toner is out during color image formation, the control unit 9 continues to form an image in the mono color mode using toner of a color that does not cause the developer to run out. Thus, the image forming unit 6 is controlled. At this time, if the job being executed is related to the required number of copies, the control unit 9 causes the liquid crystal display unit 14 or the like to output information on the number of copies that are not formed with the required number of copies. The controller 9 accepts the setting of the color of the toner used for image formation in the mono color mode by the operation panel 11 or the I / F unit 94, and the control unit 9 performs image processing according to the setting input to the input unit. The forming unit 6 may be controlled.

  Next, details of toner usage reduction in the toner save mode of the multifunction machine 1 according to the embodiment of the present invention will be described with reference to FIG. FIG. 9 is a graph showing an example of the relationship between the passage of time and the remaining amount of toner. FIG. 9A shows a case where toner save is not performed, and FIG. 9B shows a case where toner save mode according to the present invention is executed. Indicates.

  First, how to view FIG. 9 will be described. The horizontal axis in FIG. 9 shows the elapsed time from the start of use. The vertical axis represents the remaining amount of toner in each container 10 in%. Then, at the initial point of this graph, each container 10 is assumed to start from a state where none is used. In general, although there is a variation depending on the contents of image formation, the inclination of the decrease in the toner of each color in each container 10 is assumed to be constant on average.

  In general, since the consumption of black toner tends to be large, the slope of the line indicating the decrease in black toner is expressed as the steepest (in FIG. 9, the black line has a symbol K). Is attached.) Next, generally, there is a tendency that the consumption amount of cyan or magenta toner tends to be large, but here, explanation will be made on the assumption that the consumption amount of cyan is large and the slope of the line in which cyan decreases is steep (FIG. 9). The C line is assigned to the cyan line, and the M code is assigned to the magenta line.) Finally, the consumption of yellow toner generally tends to be the smallest among the four colors, and the slope of the line indicating the decrease in yellow toner is expressed as the most gradual (in FIG. 9, the yellow line represents Is marked with a Y sign.)

  As shown in FIG. 9A, when the remaining amount of toner is not controlled without taking into consideration the remaining amount of toner (equivalent to full color mode or printing of essential copies), that is, the amount of toner used with a small remaining amount If the toner is not reduced (saved), each color toner runs out at each timing. Note that the conventional toner save mode reduces the total amount of toner used evenly, so there is no difference in that the toner runs out at each timing.

  Therefore, in FIG. 9, the alphabet K (black), C (cyan), and the like representing the color of the toner, respectively, are displayed at the replacement timing of each color, that is, at the intersection of the line and the time axis (toner remaining amount 0%). M (magenta) and Y (yellow) are added. Then, as shown in FIG. 9A, it can be seen that the containers 10 must be frequently exchanged. Note that the number of replacements of each container 10 in the portion shown in FIG. 9A is 13 times (the portion where K and Y overlap is counted as one time).

  As described above, in general, an image forming apparatus using a plurality of colors of toner requires frequent replacement of each container 10, which is bothersome and inconvenient for the user. Further, if the image forming operation is normally stopped together with the occurrence of toner exhaustion as in the prior art, the productivity of the multi function device 1 is reduced, and the image formation is not stopped for a long time. The user needs to be careful about running out of toner, which is not convenient.

  Here, looking at FIG. 9B, which is a graph when the present invention is implemented, the replacement times of the K, C, and M containers 10K, 10C, and 10M are the same, and the same as in FIG. 9A. The number of exchanges over time has dropped dramatically to 5 times.

  Therefore, the control for matching the replacement timing of each container 10 in the toner save mode according to the present invention will be described in detail.

  As shown in FIG. 9B, the multi-function device 1 of the present embodiment has two threshold values that serve as a guide for the remaining amount of toner when saving the amount of toner used. Specifically, as indicated by a two-dot chain line in FIG. 9B, there are a time when the remaining amount of toner in each container 10 is 20% and a time when it is 10%. For example, when the remaining amount of toner is between 10% and 20%, in the toner save mode, the toner usage is reduced by 25% compared to normal (less than the full color mode), and when less than 10%, the toner usage is reduced. Reduce by 50% than usual. That is, a plurality of threshold values are set in the toner save mode, and the control unit 9 controls the image forming unit 6 so that the image forming is performed with the use rate of the developer increased as the threshold value is lowered. To do. The saving ratio of the usage amount is merely an example and can be arbitrarily set. In addition, the control unit 9 controls the image forming unit 6 based on a change in the save rate of the toner usage amount at the threshold value in the toner save mode by an input to the I / F unit 94 via the operation panel 11 or the user terminal 100. You may do it.

  However, simply when the remaining amount of toner decreases, frequent replacement of each container 10 may occur even if the amount of toner used is reduced at a certain rate. That is, the timing at which toner runs out can be delayed, but the timing at which toner runs out may vary.

  Therefore, in the present invention, as shown in FIG. 9B, in the toner save mode, when the remaining amount of black toner reaches 10% or less which is a lower threshold, the black toner is used. Although the amount is reduced by 50%, the current toner usage is maintained for cyan, magenta, and yellow (for example, cyan and magenta maintain a reduction of 25%, yellow does not decrease, etc.). Then, referring to detection of the remaining amount by the detection unit 95, the control unit 9 maintains a state where the toner usage amount of cyan and magenta is reduced by 25% until the remaining amount of cyan and magenta toner is the same as that of black. To do. Thereafter, when the ratios of the remaining amounts of black, cyan, and magenta toners become the same, the toner usage amounts of cyan and magenta are reduced by 50%. That is, in the toner save mode, when the detection unit 95 detects that the remaining amount of toner of one color out of the plurality of colors is below the threshold, the control unit 9 uses the toner for the detected color toner. The amount of toner is saved, and for other colors of toner, the current amount of toner used is maintained until the remaining amount of toner is the same as the color for which the amount of use is saved, and the replacement times of the plurality of containers 10 are made to coincide. .

  By such control, at least the replacement times of the black, cyan, and magenta containers 10K, 10C, and 10M can be matched. Unless the image formation in the full-color mode or the mono-color mode is continued, the use of the toner save mode of the present embodiment can absorb the difference in toner consumption and match the container 10K, 10C, and 10M replacement times. Is possible. Accordingly, the three color toner containers 10K, 10C, and 10M can be exchanged at the same time, and the frequency of exchanging each container 10 is reduced, thereby increasing the convenience for the user.

  Moreover, even if one color is cut out of black, cyan, and magenta by the full color mode or the mono color mode, the ratio of the remaining amount of toner of other colors is in the single digit range (for example, about 1 to 5%). ). Then, at the same time, even if the three color containers 10K, 10C, and 10M of black, cyan, and magenta are replaced at the same time, a large amount of toner does not remain in the containers 10K, 10C, and 10M. I can say that It should be noted that image formation may be performed in the mono-color mode depending on the color of the toner that is not cut, and the toner of that color may be used up.

  As shown in FIG. 9B, if the black, cyan, and magenta containers 10K, 10C, and 10M are exchanged at the same time, normally, the black toner first has a toner remaining amount of 10% or less. However, if the remaining amount of cyan or magenta toner first becomes 10% or less, the controller 9 may similarly control the use of other colors. Further, since the replacement cycle of the yellow container 10Y is considerably shifted, the usage amount of yellow may always be saved in the toner save mode, or the remaining amount is below the threshold of 20% regardless of other colors. 25% and the remaining amount of 10% may be reduced by 50% when the remaining amount is below the threshold, and yellow is controlled to coincide with the replacement timing of the other color containers 10K, 10C, and 10M. There may be no (that is, the replacement times of the containers 10 other than yellow are matched).

  In this way, according to the present embodiment, even when the remaining amount of toner is low, the required number of copies for image formation can be input without reducing (saving) the amount of toner used in the total number of copies for image formation. Therefore, even when the remaining amount of toner is low, it is possible to perform image formation reflecting the user's request. In addition, for the number of copies other than the essential number of copies, the toner formation is reduced, so that the toner can be prevented from running out during the image formation.

  In addition, since a plurality of threshold values are set and the amount of toner used is reduced as the remaining amount of toner decreases, it is possible to prevent the occurrence of running out of toner during image formation, and to improve user convenience. it can. That is, the toner usage can be finely adjusted by having a plurality of threshold values. Also, the toner usage amount is adjusted so that the current toner usage amount is maintained until the remaining amount of toner is the same as the color that saves the usage amount, and the timing at which the toner finally runs out is adjusted. be able to. Therefore, it is possible to make the replacement timings of the toner containers 10 coincide with each other, and it is possible to exchange a plurality of containers 10 at a time, and it is possible to reduce the amount of work required to replace each container 10 as compared with the prior art. That is, the convenience of the user can be improved in replacing each container 10.

  Further, even if the toner usage is adjusted and the replacement timing of each container 10 is matched, the toner may run out during the relationship with the required number of copies or during the formation of a large amount of images. Even in that case, it is possible to prevent the image formation from being stopped by continuing at least monochrome printing. Conventionally, when image formation is stopped due to running out of toner, the state is left without the user's knowledge and even monochrome printing (for example, a document in black) is performed until one of the containers 10 is replaced. Although this was not possible and productivity and convenience were impaired, the present invention can eliminate such disadvantages. In addition, since the number of copies that had to be printed in the single color among the required number of copies can be transmitted to the user, the user can easily confirm the printing status. Therefore, a highly convenient image forming apparatus can be provided.

  Further, based on the information from the output unit, the user can grasp the replacement time of each container 10. On the other hand, it is possible to ascertain the color of toner with sufficient toner remaining. Therefore, for example, it is possible to transmit information in consideration of the convenience of the user, such as preferentially using a color toner with sufficient toner remaining. In general, yellow may consume less toner than other colors. In addition, it is difficult to see even when text or the like is printed with yellow, and since only yellow is rarely used for monochromatic printing, the amount of toner consumption may be smaller than other toners. Therefore, it is possible to prevent the replacement timing of the other color containers 10K, 10C, 10M and the like from being replaced with the replacement timing of the yellow container 10Y.

  In monochromatic printing, black image formation is most performed, and the formed image is easy to visually recognize. In monochromatic printing, black toner is preferentially used. On the other hand, when the black toner has run out, it is difficult to see a yellow single-color printed image. Therefore, by forming an image using a color other than yellow, the visibility of the formed image is ensured. Can do. Accordingly, it is possible to provide an image forming apparatus in which an easy-to-see image is formed even when toner runs out. According to this configuration, since the user can set the second mode and the third mode, it is possible to provide an image forming apparatus that is highly user-friendly and highly convenient.

  Hereinafter, other embodiments will be described. In the above-described embodiment, the tandem type copying machine including four photosensitive drums 62 has been described. However, the present invention can be applied to, for example, a rotary color image forming apparatus including only one photosensitive drum 62.

  Although the embodiments of the present invention have been described above, the scope of the present invention is not limited to these embodiments, and various modifications can be made without departing from the spirit of the invention.

  The present invention is applicable to an image forming apparatus that performs color images using a plurality of color developers.

1 is a system configuration diagram of a multifunction peripheral according to an embodiment of the present invention. 1 is a schematic front sectional view of a multifunction machine according to an embodiment of the present invention. FIG. 3 is a partially enlarged schematic cross-sectional view of an image forming unit according to an embodiment of the present invention. 1 is a perspective view of a multifunction machine according to an embodiment of the present invention. It is a figure which shows an example of the mode setting of the multifunctional device which concerns on embodiment of this invention. It is a block diagram for demonstrating control of the multifunctional device which concerns on embodiment of this invention. 6 is a flowchart for explaining an example of an image forming operation in color of the multifunction peripheral according to the embodiment of the invention. 6 is a flowchart illustrating a processing flow when toner runs out during color image formation in the multifunction peripheral according to the embodiment of the present invention. 6 is a graph showing an example of the relationship between the passage of time and the remaining amount of toner, where (a) shows a case where toner save is not performed, and (b) shows a case where toner save mode according to the present invention is implemented.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Multifunctional device (image forming apparatus) 9 Control part 11 Operation panel (input part, output part) 94 I / F part (input part, output part)
6 Image forming unit 95 Detection unit 61 Image forming unit 96 Remaining amount detection sensor 10K, 10Y, 10C, 10M Container (replenishment unit)

Claims (10)

In an image forming apparatus having an image forming unit that forms a color image by using a plurality of color developers,
An input unit for inputting the number of copies and mode setting for image formation in the image forming unit to the apparatus;
A control unit for controlling the operation of the image forming unit based on the setting of the input unit;
A plurality of replenishing units configured to replenish and replace each color developer in the image forming unit;
A detection unit for detecting the remaining amount of developer of each color of the replenishment unit,
In the first mode in which the image forming unit performs normal image formation without saving the usage amount of the developer during color image formation, or the detection unit detects that the remaining amount of the developer is equal to or less than a threshold value. When detected, it is possible to perform image formation in the second mode in which the amount of developer used for the color that has become the threshold value or less is saved from the first mode and image formation is performed,
In the setting of the number of copies to perform image formation, the input unit accepts setting input of the required number of copies to perform image formation in the first mode out of the total number of copies, and the control unit sets the required number of copies in the first mode. An image forming apparatus that performs image formation and controls the image forming unit to perform image formation in the second mode for the other number of copies.   A plurality of the threshold values in the second mode are set, and the control unit controls the image forming unit so that image formation is performed with a larger usage rate of the developer as the threshold value decreases. 2. The image forming apparatus according to claim 1, wherein the image forming apparatus is controlled.   In the second mode, when the detection unit detects that the remaining amount of developer of one color out of a plurality of colors is below a threshold, the control unit detects the developer of the detected color. Save the amount of developer used, and for other colors of developer, maintain the current amount of developer used until the remaining amount of developer is the same as the color that saved the amount used, 3. The image forming apparatus according to claim 1, wherein the replacement times of the plurality of replenishing units are matched.   4. The image forming apparatus according to claim 3, wherein when the color of the developer used by the image forming unit includes yellow, the one color developer does not include yellow. The image forming unit can perform image formation in a third mode in which image formation is performed using only a single color developer,
During the color image formation, when the detection unit detects that the developer of any color has run out,
If the job being executed is not related to the required number of copies, the control unit uses the developer of a color that has not run out of the developer so as to continue image formation in the third mode. The image forming apparatus according to claim 1, wherein the image forming apparatus is controlled. It has an output unit for transmitting information to the user,
The image forming unit can perform image formation in a third mode in which image formation is performed using only a single color developer,
During the color image formation, when the detection unit detects that the developer of any color has run out,
When the job being executed is related to the required number of copies, the control unit uses the developer of a color that does not cause the developer to run out so as to continue image formation in the third mode. 5. The image forming apparatus according to claim 1, wherein the image forming apparatus controls the number of copies, and causes the output unit to output information on the number of copies not formed with the required number of copies.   7. The output unit according to claim 6, wherein the output unit outputs information indicating the remaining amount of the developer in the replenishing unit, the developer running out, and information indicating the replenishing unit with a short remaining amount of developer and a near replacement timing. The image forming apparatus described   The image according to any one of claims 1 to 7, wherein the developer used by the image forming unit and supplied by the replenishing unit has four colors of black, yellow, cyan, and magenta. Forming equipment.   The control unit preferentially uses the black developer when performing image formation in the third mode when the detection unit detects that the developer of any color has run out during color image formation. When image formation is performed and the black developer runs out, image formation is performed using cyan or magenta developer, and in the third mode, the image forming unit is controlled not to use yellow developer. The image forming apparatus according to claim 8.   The input unit accepts a setting change of a save rate of developer usage at the threshold value in the second mode or a setting of a developer used for image formation in the third mode, and the control unit The image forming apparatus according to claim 5, wherein the image forming unit is controlled based on a setting input to the input unit.

Images