JP6040754B2 - Image forming apparatus, control method thereof, and control program thereof - Google Patents

Description

  The present invention relates to an image forming apparatus, a control method therefor, and a control program therefor, and more particularly to an image forming apparatus that displays information related to printing costs, a control method therefor, and a control program therefor.

  Conventionally, in an image forming apparatus, various techniques have been disclosed for displaying a printing cost related to paper.

  For example, Patent Document 1 (Japanese Patent Laid-Open No. 2010-157071) includes an ink cost, a paper cost based on a paper size and a paper type selected on a print setting screen, and an additional cost for an image forming apparatus. It is disclosed that the printing cost is calculated and displayed. The additional cost is a cost required for an operation different from a normal printing operation such as cleaning, nozzle check pattern printing, paper jam, and the like, and is a cost obtained from the ink consumption and the unit price of paper.

  Further, in Patent Document 2 (Japanese Patent Application Laid-Open No. 4-179654), in a paper transporting device such as a copying machine, the paper transporting device notifies the jam occurrence rate due to wear, deterioration, or the like, so that the paper transporting device causes the jamming. It is disclosed to notify whether or not it is in a state where it is likely to occur. According to this document, it is easy to generate a jam by objective judgment to the user by detecting a state in which a jam is likely to occur for each jam location in the paper conveyance device and notifying this. A function for recognizing the situation is proposed.

JP 2010-157071 A JP-A-4-179654

  In the development process, the development manufacturer verifies the paper-passability of multiple types of paper that are expected to be used in the market, and grasps the frequency of jam and the tendency of the jam location on the paper that is expected to be used in the market. Thus, the cost of the paper can be assumed.

  On the other hand, in order to reduce the cost of paper, the user may use cheap paper other than the specifications assumed as described above.

  Here, depending on the brand of the paper, there is a paper that is easily jammed due to a difference in characteristics such as a difference in water content and strength. For example, when the brand paper used in the image forming apparatus is thin and weak, it is easy to back curl by heating in the fixing device. Further, when such a sheet is printed on both sides, when the paper is passed by another sheet at the reversing unit, the back-curled edge of the sheet hits the other sheet, and the ear fold or jam is likely to occur. Further, when the brand paper used in the image forming apparatus is slippery on the surface, the roller slips more than expected, and the interval between the paper and the subsequent paper is clogged in the transport unit, and jamming is likely to occur.

  When a jam occurs, depending on the occurrence location, a residual paper may be generated in the machine, and a plurality of sheets may have to be discarded for one jam processing. For example, when a jam occurs in the paper discharge unit, the subsequent paper is blocked by the jam paper and cannot be discharged outside the machine and remains in the machine. At that time, if the succeeding sheet stops in a state where toner is not fixed, the sheet cannot be used and must be discarded. Also, if a paper is accidentally scratched during jam processing, it cannot be reused and must be discarded.

  For this reason, the paper cost cannot be accurately calculated unless the number of remaining in-machine sheets generated by a single jam is taken into consideration.

  Even if the user feels that the number of jams has increased sensibly, it does not measure the frequency of jam occurrence by brand, so the cost of paper brands used is higher than the cost of other paper brands. It is not possible to accurately judge the boundary. In addition, when multiple users share the image forming apparatus, the user does not know the jam caused by other users, so individual users cannot know the statistics of the jam tendency. .

  As described above, when various brands of paper are used in the image forming apparatus, the difference in cost due to the difference of brands cannot be calculated depending on the conventional technology.

  In the technique described in Patent Document 1, the paper cost is calculated from the cost based on the paper size and the paper type and the cost obtained from a different operation, but it is considered that the occurrence frequency of the jam differs depending on the brand. Therefore, it is impossible to inform the user that the actual paper cost varies depending on the brand. Therefore, even if the price of the paper is low, the user does not realize that it is actually expensive when used in the image forming apparatus, and there remains a problem that the user continues to use expensive paper as it is.

  Further, in the technique described in Patent Document 2, although the frequency of jam occurrence at each jam location can be known, the cost of paper is not taken into consideration, so that the user can increase the cost of paper by increasing the frequency of jam. I can't tell you. Therefore, in this case, even if the price of the paper is low, the user does not realize that it is actually expensive when used in the image forming apparatus, and there remains a problem of continuing to use expensive paper as it is.

  The present invention has been conceived in view of the actual situation, and an object of the present invention is to inform a substantial difference in the cost of paper for each brand for an image forming apparatus using a plurality of brands of paper. Is to do.

An image forming apparatus according to the present invention is stored in an image forming unit for executing an image forming operation, a paper feed tray for storing paper supplied for image formation by the image forming unit, and a paper feed tray. The number of printed sheets that measures the number of printed sheets for each brand of paper, the number of jams that measures the number of jams that occur for each brand of paper stored in the paper feed tray, and the number of paper that is stored in the paper tray. Paper price information storage means for storing the price for each brand, and paper cost calculation means for calculating the paper cost of the brand from the price, the number of printed sheets, and the number of jam occurrences for each brand of paper stored in the paper feed tray Display means for displaying the paper cost calculated by the paper cost calculation means.

  Preferably, for each print mode and jam occurrence location, the printer further comprises a remaining sheet number measuring unit for measuring the remaining number of sheets, which is the number of sheets remaining in the image forming apparatus when the jam occurs, and the sheet cost calculating unit further includes The cost is calculated from the number of sheets.

  Preferably, the apparatus further includes reference value storage means for storing a reference value for the cost, and the display means displays the cost together with the reference value.

  Preferably, the image forming unit further includes a designating unit that designates a brand of paper to be used for image formation, and the display unit, when the cost of the brand designated by the designating unit is higher than a reference value, Is displayed.

  Preferably, the jam frequency measuring means further stores the number of jam occurrences for each printing mode, the paper cost calculating means calculates the cost for each printing mode in the image forming means, and the display means is designated by the designation means. For brands, the brand with the lowest cost is displayed.

  Preferably, there is further provided setting means for setting the reference value from the price stored in the paper price information storage means.

  Preferably, the paper cost calculation means calculates the jam frequency for each brand of the paper based on the number of printed sheets and the number of jam occurrences, and calculates the cost by adding a loss corresponding to the frequency.

  Preferably, for each print mode and jam occurrence location, the printer further comprises a remaining sheet number measuring unit that measures the remaining number of sheets remaining in the image forming apparatus when the jam occurs, and the sheet cost calculating unit includes: For each brand, calculate the jam frequency based on the number of printed sheets and the number of jam occurrences, and calculate the cost for each brand of paper by adding the loss corresponding to the frequency and the loss corresponding to the remaining number of sheets. .

  Preferably, the jam count measuring unit measures the number of jams for each print mode, and the sheet cost calculating unit calculates the cost for each print mode in the image forming unit, and designates the print mode for image formation by the image forming unit. A mode designating unit is further provided, and the display unit displays the brand with the lowest cost for the print mode designated by the designating unit.

  Preferably, paper brand discriminating means for discriminating brands of paper set in the paper feed tray is further provided.

  An image forming apparatus control method according to the present invention includes an image forming unit for executing an image forming operation, and an image feed tray that stores sheets supplied for image formation by the image forming unit. A method of controlling the image forming apparatus executed by the forming apparatus, the step of measuring the number of prints for each brand of paper stored in the paper feed tray, and the jam for each brand of paper stored in the paper feed tray The step of measuring the number of occurrences, the step of storing the price for each brand of paper stored in the paper feed tray, and the price, the number of prints, and the number of jam occurrences for each brand of paper stored in the paper feed tray A step of calculating the cost of the brand paper, and a step of displaying the calculated cost of the paper.

  An image forming apparatus control program according to the present invention includes an image forming unit for executing an image forming operation, and a paper feed tray for storing sheets supplied for image formation by the image forming unit. A control program for the image forming apparatus, which is executed by a computer of the forming apparatus. The control program causes the computer to measure the number of printed sheets for each brand of paper stored in the paper feed tray; Measuring the number of jam occurrences for each brand of paper stored in the paper, storing the price for each brand of paper stored in the paper feed tray, and for each brand of paper stored in the paper feed tray, A step of calculating the paper cost of the brand from the price, the number of printed sheets and the number of jam occurrences and a step of displaying the calculated paper cost are executed.

  According to the present invention, when a plurality of brand papers are used in the image forming apparatus, the user can be notified of a substantial difference in the cost of the paper for each brand.

1 is a schematic front sectional view showing an image forming apparatus 1 which is an embodiment of an image forming apparatus of the present invention. 2 is a diagram schematically illustrating a hardware configuration of the image forming apparatus 1. FIG. 2 is a diagram illustrating a functional configuration of the image forming apparatus 1. FIG. 3 is a diagram schematically illustrating an example of storage contents in a paper price information storage unit. FIG. 6 is a diagram schematically illustrating an example of stored contents in a paper brand determination unit 105. FIG. FIG. 6 is a diagram schematically illustrating an example of the contents stored in a print number storage unit 103. 6 is a diagram schematically illustrating an example of storage contents in a jam count storage unit 104. FIG. 3 is a flowchart of processing executed when an image is formed in the image forming apparatus 1. It is a flowchart of the subroutine of step S20. It is a flowchart of a subroutine of Step S50. 6 is a diagram illustrating an example of a screen displayed on the display unit 111. FIG. 3 is a diagram schematically illustrating a functional configuration of a second embodiment of the image forming apparatus 1. FIG. It is a figure which shows typically the memory content of the in-machine residual number memory | storage part 121. FIG. It is a flowchart for the calculation of the paper cost in this Embodiment. FIG. 11 is a modified example of the flowchart for displaying the sheet cost in FIG. 10. FIG. 3 is a diagram illustrating a state in which the warning message is displayed on the operation panel 110 of the image forming apparatus 1. FIG. It is a modification about the flowchart of FIG. It is a flowchart of a subroutine for displaying a recommended print mode in steps S51 and S81. It is a figure which shows an example of the display which recommends the single-sided printing mode. It is a figure which shows an example of the modification of the memory | storage table of the number of printed sheets. FIG. 9 is still another modification of the flowchart of FIG. 8. FIG. 10 is a flowchart of a subroutine for displaying a sheet cost and a recommended paper feed tray in steps S52 and S82. It is a figure which shows an example of the display in step SD40.

  Hereinafter, an image forming apparatus according to the present invention will be described with reference to the drawings. In addition, in each figure, the same code | symbol is attached | subjected about the component which show | plays the same effect | action and function, and the description is not repeated.

<First Embodiment>
[Entire configuration of image forming apparatus]
FIG. 1 is a schematic front sectional view showing an image forming apparatus 1 which is an embodiment of the image forming apparatus of the present invention. As shown in FIG. 1, the image forming apparatus 1 includes an image reading device 10, a printing device 20, a fixing device 80, and a central control device 100.

  Imaging units 150K, 150Y, 150M, and 150C are detachably attached to the printing apparatus 20. The imaging units 150 </ b> K, 150 </ b> Y, 150 </ b> M, and 150 </ b> C are covered with a cover (front cover) (not shown) when attached to the image forming apparatus 1 and are included in the image forming apparatus 1. .

  The image reading device 10 includes a scanner, and is a known device that reads an image of a document placed on a document glass plate (not shown) by moving the scanner. In the image reading apparatus 10, an original image obtained by irradiation with an exposure lamp is formed by a condenser lens, and further, the spectrometer has three wavelengths of red (R), green (G), and blue (B). The light is split into light and respectively incident on a red CCD (Charge Coupled Device) image sensor, a green CCD image sensor, and a blue CCD image sensor. An output signal from each CCD image sensor (hereinafter simply referred to as “CCD sensor”) is AD (analog-to-digital) converted by the central control device 100 and converted into R, G, B image data of the document. .

  The obtained image data for each color component is subjected to various data processing in the central control device 100, and each reproduction color (black (K), yellow (Y), magenta (M), cyan (C)) ( In the following, the image data of K, Y, M, and C are added as subscripts to the component numbers related to each reproduction color. The converted image data is stored for each reproduction color in a RAM (a RAM 152 described later) in the central controller 100, and subjected to various correction processes such as registration correction. Thereafter, the image data is read for each scanning line in synchronism with the supply of printing paper (hereinafter simply referred to as “paper”), and the laser diode for exposing the photosensitive drums 51K, 51Y, 51M, 51C is driven. Signal.

  The printing apparatus 20 includes a transfer belt 41, imaging units (image forming units) 150K, 150Y, 150M, and 150C for each color, exposure scanning units 60K to 60C, a paper feeding unit 70, a duplex unit 82, and a paper discharge unit. 90.

  The transfer belt 41 is stretched and driven in the printing apparatus 20. The imaging units 150K, 150Y, 150M, and 150C are arranged facing the transfer belt 41 at a predetermined interval.

  The exposure scanning units 60K to 60C are provided for each imaging unit. The paper feeding unit 70 feeds the paper to the transfer belt 41. The exposure scanning units 60K to 60C receive the drive signal output from the central controller 100 and emit laser light, and the main scanning is performed on the photosensitive drums 51K to 51C by deflecting the laser light. A polygon mirror (not shown) for exposing and scanning in the direction is provided.

  The printing apparatus 20 further includes a punch unit 87, a folding unit 88, and a stapler 89 for performing post-processing on the paper after image formation. The punch unit 87 makes a punch hole in the paper. The folding unit 88 performs a folding process such as folding in half. The stapler 89 staples the paper.

  The paper feed unit 70 adjusts the paper feed trays 71 to 74 for storing paper, the pickup roller 76 for feeding out the paper stored in each paper feed tray, and the timing for feeding the fed paper to the transfer belt 41. A registration roller 79. Papers of different brands are stored in the paper feed trays 71 to 74. In this specification, the brand stored in the paper feed tray 71 is “A”, the brand stored in the paper feed tray 72 is “B”, the brand stored in the paper feed tray 73 is “C”, The brand stored in the paper feed tray 74 is called “D”.

  Although omitted in FIG. 1, the pickup roller 76 is provided for each of the paper feed trays 71 to 74.

  The sheet on which the toner images of the respective colors are multiplex-transferred is conveyed to the fixing device 80 by the transfer belt 41.

  The fixing device 80 includes a fixing roller 801. The fixing roller 801 includes a heater therein, and the central controller 100 controls energization of the heater while detecting the surface temperature of the fixing roller 801 with a temperature detection sensor. The sheet sent to the fixing device 80 is pressurized at a high temperature by the fixing roller 801, and the toner particles on the surface thereof are fused and fixed on the surface of the sheet, and then sent to the paper discharge unit 90 and discharged. It is discharged to any of the trays 91-93. The paper discharge unit 90 is provided with paper discharge rollers 901 to 903 corresponding to the paper discharge trays 91 to 93, respectively.

  When image formation is performed on the front and back surfaces of the paper, the image forming apparatus 1 fixes the image formed on the front surface of the paper with the fixing device 80 and then sends the paper to the duplex unit 82. Thereafter, in the image forming apparatus 1, an image is formed on the back surface of the paper, and the image formed on the back surface is fixed by the fixing device 80, and then the paper is placed on one of the paper discharge trays 91 to 93. Discharged.

[Hardware configuration of image forming apparatus]
FIG. 2 is a diagram schematically illustrating a hardware configuration of the image forming apparatus 1.

  Referring to FIG. 2, image forming apparatus 1 includes sheet conveying device 30 and operation panel 110 in addition to central control device 100, document reading device 10, printing device 20, and fixing device 80. .

  The paper conveying device 30 conveys the paper in the image forming apparatus 1 from the paper supply unit 70 to the paper discharge trays 91 to 93. The paper transport device 30 includes a motor for driving various rollers on the transport path and a sensor for detecting the passage (presence) of the paper on the path.

  The operation panel 110 includes a display unit 111 that displays the state of the image forming apparatus 1 and information that assists the operation, and an operation unit 112 that is operated when a user inputs information to the image forming apparatus 1.

  The central controller 100 includes a CPU (Central Processing Unit) 151 that controls the entire image forming apparatus 1, a RAM (Random Access Memory) 152 that temporarily stores data, a program executed by the CPU 151, constants, and the like. A ROM (Read Only Memory) 153 to be stored, a storage unit 154 for storing image data and the like, an output control unit 155 for controlling paper discharge in the paper discharge unit 90, a personal computer, etc. via a network A communication input / output device (abbreviated as “I / O” (Input / Output) in FIG. 2) 156 for communicating with other devices.

[Functional configuration of image forming apparatus]
FIG. 3 is a diagram illustrating a functional configuration of the image forming apparatus 1.

  In the image forming apparatus 1, the central control device 100 receives the setting of the brand of the paper stored in each paper feed tray via the operation panel 110. For example, the control panel 110 displays the brand of the paper whose price is stored in the central control device 100, and selects the brand stored in each paper feed tray from among the brands, thereby accepting the above setting. Note that the central control device may accept a setting of a new brand (and its price) via the operation panel 110.

  The central controller 100 also accepts an instruction for a copy operation (print operation) via the operation panel 110.

  The central controller 100 further includes a reference sheet cost information storage unit 101, a jam detection unit 102, a printed sheet number storage unit 103, a jam number storage unit 104, a paper brand determination unit 105, and a printed sheet number measurement unit 106. , A jam frequency measurement unit 107, a paper price information storage unit 108, and a paper cost calculation unit 109.

  The reference sheet cost information storage unit 101 stores reference sheet cost information as information indicating a reference value of a preset sheet cost.

  The jam detection unit 102 detects a paper jam in the image forming apparatus 1 for each jam occurrence location.

  The print number storage unit 103 stores the number of prints for each brand of paper in the image forming apparatus 1.

The jam count storage unit 104 stores the number of jam occurrences for each jam occurrence location.
The paper brand determination unit 105 determines the brand of the paper set in each of the paper feed trays 71 to 74 based on the setting content from the operation panel 110 and stores the correspondence relationship.

  The printed sheet count unit 106 counts the number of printed sheets for each paper brand. In the image forming apparatus 1, brands of paper stored in each paper feed tray are stored. The printed sheet count unit 106 counts the number of printed sheets for each paper brand by measuring the number of printed sheets for each paper feed tray. Note that when the size of the paper stored in each paper feed tray is stored, the print number measuring unit 106 can count the number of prints for each paper size.

  The jam count measurement unit 107 detects the number of jams for each paper brand and jam location based on the output from the jam detection unit 102.

The paper price information storage unit 108 stores paper price information representing the price for each paper brand.
The paper cost calculation unit 109 calculates the paper cost per sheet of each brand.

  In the image forming apparatus 1 according to the present embodiment, the CPU 151 executes the program stored in the storage unit 154, thereby realizing the functions of the image forming apparatus 1 described in this specification.

  The storage unit 154 may be fixed to the main body of the image forming apparatus 1 or may be a storage medium that is detachable from the main body. Such storage media include CD-ROM (Compact Disk-Read Only Memory), DVD-ROM (Digital Versatile Disk-Read Only Memory), USB (Universal Serial Bus) memory, memory card, FD (Flexible Disk), Hard disk, magnetic tape, tray tape, MO (Magnetic Optical Disk), MD (Mini Disk), IC (Integrated Circuit) card (excluding memory card), optical card, mask ROM, EPROM, EEPROM (Electronically Erasable Programmable Read Only Memory) And the like, for example, a medium for storing the program in a nonvolatile manner. Note that the functions of the image forming apparatus 1 described in this specification may be realized by the CPU 151 executing a program stored in a storage device on a network.

[Contents stored in the reference sheet cost information storage unit]
The reference sheet cost information storage unit 101 stores reference sheet cost information.

  The reference sheet cost is a cost per recommended sheet of paper determined at the time of development of the image forming apparatus 1 based on a result of verifying the sheet passing property using a plurality of types of sheets. The value may be set in advance at the time of shipment of the image forming apparatus 1 or may be input and set from the operation panel 110.

[Storage contents of paper price information storage unit]
FIG. 4 is a diagram schematically illustrating an example of the contents stored in the paper price information storage unit 108.

  In the example of the sheet price information shown in FIG. 4, the price of one sheet is shown for each brand of the sheet. This price is, for example, the price at which each sheet is distributed. The information of FIG. 4 is stored in the paper price information storage unit 108 when the image forming apparatus 1 is shipped, or is input from the operation panel 110, for example.

[Contents of paper brand judgment section]
FIG. 5 is a diagram schematically illustrating an example of the contents stored in the paper brand determination unit 105.

  In FIG. 5, each of the paper feed trays 71 to 74 is associated with one of the brands whose prices are registered in the paper price information of FIG. In the example shown in FIG. 5, each of the paper feed trays 71 to 74 is associated with a different brand, but at least a part of these may overlap. That is, for example, when sheets of the same brand are stored in the paper feed tray 71 and the paper feed tray 72, the brands associated with these in the information of FIG. 5 overlap.

[Contents stored in the number-of-prints storage unit]
FIG. 6 is a diagram schematically illustrating an example of the contents stored in the print number storage unit 103.

  In the example of the printed sheet number storage table shown in FIG. 6, the number of printed sheets is stored for each paper brand. The number-of-printing-number measuring unit 106 measures the number of sheets used for printing (image formation) on the paper stored in each of the paper feed trays 71 to 74. The paper cost calculation unit 109 calculates the number of prints of each brand based on the measurement result for each of the paper feed trays 71 to 74 and the relationship shown in FIG.

[Contents stored in the jam count storage unit]
FIG. 7 is a diagram schematically illustrating an example of the contents stored in the jam count storage unit 104.

  In the example of the jam count storage table shown in FIG. 7, the number of jam occurrences (hereinafter also referred to as “the number of jams”) is shown for each brand of paper and for each location where a jam has occurred.

  The jam detection unit 102 detects the occurrence of a jam for each of the above locations, and outputs the result to the jam count measurement unit 107. The jam count measurement unit 107 measures the number of jams for each jam occurrence location. The jam count measurement unit 107 further specifies which paper tray is used when a jam occurs from a job management unit (a part that manages job execution in the image forming apparatus 1; not shown in FIG. 3 and the like). Information is acquired, and the number of jams is measured for each paper feed tray that was used when the jam occurred. Then, the jam count measuring unit 107 converts the jam count for each paper feed tray into a jam count for each paper brand based on the relationship shown in FIG. Then, the jam count measurement unit 107 transmits the jam count measured for each jam occurrence location and each brand to the jam count storage unit 104.

  In FIG. 7, a paper feed unit, a transport unit, a transfer unit, a paper discharge unit, a double-side unit, and a post-processing unit are shown as places where a jam has occurred.

  The paper feed unit means the vicinity of the paper feed trays 71 to 74. When the paper fed from each paper feed tray is not desired to be detected at the timing when the presence of the paper is to be detected by the sensor in front of the registration roller 79 (when it does not reach the detection position), or near each tray When the presence of the paper sensor provided is detected for a long time longer than expected, it is determined that a jam has occurred in the paper feed unit.

  The conveyance unit means a position from the registration roller 79 to the transfer belt 41. When the paper sensor arranged on the conveyance path from the registration roller 79 to the transfer belt 41 has not been detected at the timing when the paper should be detected, or when it has been detected continuously for a longer time than expected, It is determined that a jam has occurred in the transport unit.

  The transfer portion means a position from the transfer belt 41 to the fixing device 80. When the paper sensor arranged on the conveyance path from the transfer belt 41 to the fixing device 80 has not been detected at the timing when the paper should be detected, or has been detected for a long time longer than the expected time, It is determined that a jam has occurred in the transfer portion.

  The paper discharge unit means a position from the fixing device 80 to the punch unit 87. When the paper sensor arranged on the conveyance path from the fixing device 80 to the punch unit 87 has not been detected at the timing when the paper should be detected, or has been detected for a long time longer than the expected time, It is determined that a jam has occurred in the paper discharge unit.

  The double-sided part means the double-sided unit 82. If the paper sensor arranged on the conveyance path of the duplex unit 82 does not detect the paper at the timing when it should be detected, or if it is detected continuously for a longer time than the expected time, a jam will occur in the duplex part. It is determined that it occurred.

  The post-processing unit means a position from the punch unit 87 to the paper discharge trays 91 to 93. In the paper sensor arranged on the transport path from the punch unit 87 to the paper discharge trays 91 to 93, when the paper is not detected at the timing when it should be detected, it is detected continuously for a longer time than expected. If it is determined that a jam has occurred in the paper discharge unit.

  In FIG. 7, the type of jam is omitted, but actually, the count information of the number of times of jam shown in FIG. 7 is stored for the amount corresponding to the type of jam.

[Image formation processing]
8 to 10 are flowcharts of processing executed when the image forming apparatus 1 forms an image.

  First, referring to FIG. 8, for example, when an operation for setting printing is performed in image forming apparatus 1, central control apparatus 100 specifies a paper feed tray set as a default in step S <b> 10. Then, the process proceeds to step S20.

  In step S20, the central controller 100 calculates the cost of the paper stored in the paper feed tray specified in step S10.

  FIG. 9 is a flowchart of the subroutine of step S20. Referring to FIG. 9, in step SA10, central control apparatus 100 acquires the brand of paper associated with the paper feed tray specified (selected) in step S10 (see FIG. 8) in FIG. Proceed to the process.

  In step SA20, the central controller 100 acquires the price of the branded paper acquired in step SA10 from the paper price information storage unit 108, and advances the process to step SA30.

  In step SA30, central control apparatus 100 acquires the number of printed brands acquired in step SA10 from printed number storage unit 103, and advances the process to step SA40.

  In step SA40, the central controller 100 acquires the number of jams of the brand acquired in step SA10 from the jam count storage unit 104, and advances the process to step SA50. Here, the total number of jams in the jam location in the range corresponding to the set print mode is acquired as the number of jams. Specifically, the jam location that is the target of the total number of jams basically includes the “paper feeding unit”, “conveying unit”, “transfer unit”, and “paper ejection unit”, and the printing mode is duplex printing. If the printing mode includes post-processing (such as punching by the punch unit 87, folding processing by the folding unit 88, and / or stapling by the stapler 89). Furthermore, a “post-processing unit” is included.

  In FIG. 7, the number of jams for the brand “B” is 10 times for each of the conveyance unit, the double-sided unit, and the post-processing unit, and 0 times for each of the sheet feeding unit, the transfer unit, and the sheet discharging unit. .

  In the example of FIGS. 6 and 7, for example, if the printing mode includes both double-sided printing and post-processing, the number of jams of the brand “B” is the sum of the numbers of all jams, that is, 30. Times. Further, if the print mode does not include post-processing and includes only double-sided printing, the number of jams of the brand “B” is the total number of jams other than the post-processing unit, that is, 20 times. Further, if the print mode does not include post-processing or double-sided printing, the number of jams of the brand “B” is the total number of jams other than the double-sided portion and the post-processing portion, that is, 10 times.

  Returning to FIG. 9, in step SA50, the central controller 100 uses the paper price, the number of printed sheets, and the number of jams acquired in step SA20 to step SA40, and uses the paper cost of the brand acquired in step SA10. And the process returns to FIG.

  Regarding the calculation of the paper cost, specifically, the central controller 100 calculates the paper cost according to the following equation (1).

Paper cost = Paper price + (Number of jams / Number of printed sheets) (1)
That is, the larger the number of jams in the previous printing, the larger the value added to the original paper price. As a result, as the number of jams increases with the same number of printed sheets up to that point, that is, as the rate of occurrence of jams in the number of printed sheets increases, the paper cost of the brand increases. For example, for a certain brand, when the paper price is 1.5 yen, the number of printed sheets is 100, and the number of jams is 1, the paper cost is 1.5+ (1/100), 1.51. Yen. On the other hand, when the number of printed sheets is 100 and the number of jams is 10, the sheet cost is 1.5+ (10/100), which is 1.6 yen.

  Returning to FIG. 8, after calculating the sheet cost in step S <b> 20, the central controller 100 determines in step S <b> 30 whether or not an operation for selecting a sheet feeding tray other than the sheet feeding tray set as a default is performed. If it is determined that it has been made, the process proceeds to step S40. If it is determined that it has not been made, the process proceeds to step S60. The central controller 100 advances the process to step S60 on the condition that, for example, an operation for selecting a print mode is performed instead of selecting a paper feed tray.

  In step S40, the central controller 100 calculates the paper cost for the paper feed tray selected in step S30, and advances the process to step S50. Here, for example, as described with reference to FIG. 9, the paper cost is calculated for the paper brand associated with the selected paper feed tray, as described with reference to FIG. Realized.

  In step S50, the central controller 100 causes the display unit 111 to display the paper cost calculated in step S40, and proceeds to step S60.

FIG. 10 is a flowchart of the subroutine of step S50.
Referring to FIG. 10, in step SB10, central controller 100 causes operation panel 110 (display unit 111) to display the reference sheet cost (reference value) and the sheet cost of the brand to be displayed. Then, the process returns to FIG.

FIG. 11 is a diagram illustrating an example of a screen displayed on the display unit 111.
Referring to FIG. 11, software buttons 701 to 704 for selecting each of paper feed trays 71 to 74 are displayed on screen 700.

  The screen 700 includes an image 705 that is a pop-up screen associated with the software button 702. In the image 705, the paper cost (1.3 yen / sheet) is displayed. This is the paper cost of the brand corresponding to the software button 702. The sheet cost is calculated as described with reference to FIG. The software buttons 701 to 704 are associated with the paper feed trays 71 to 74, respectively, and the paper feed trays 71 to 74 are associated with one of the brands shown in FIG. Therefore, in the image forming apparatus 1, each of the software buttons 701 to 704 is associated with one of the brands shown in FIG.

  The image 705 displays a “reference value” (1.5 yen / sheet) for the paper cost. This “reference value” is a reference value stored in the reference sheet cost information storage unit 101.

  In the image forming apparatus 1, when the user selects a paper feed tray to be used for printing, the paper cost of the brand of paper stored in the selected paper feed tray is displayed together with the reference value.

  Note that the sheet cost may be displayed together with the reference value for the sheets in the sheet feeding tray selected by default calculated in step S20 before the processes in and after step S30 are executed. This allows the user to see the paper cost for the paper tray selected by default and use the paper in that paper tray for printing, or select another paper tray and use it for printing. Can be judged.

  Returning to FIG. 8, in step S <b> 60, central controller 100 accepts the input of the print mode, sets the print mode according to the input content, and advances the process to step S <b> 70.

  In step S70, the central controller 100 calculates the paper cost according to the print mode set in step S60, and advances the process to step S80. The paper cost is calculated in step S70 according to FIG. In this case, as described above, as shown in FIG. 7, the sum of the number of jams for the jam location in the range corresponding to the print mode is used as the number of jams.

  In step S80, the central controller 100 displays the paper cost calculated in step S70 on the operation panel 110 as described with reference to FIG. 11, and advances the process to step S90.

  In step S90, central control apparatus 100 determines whether or not copying (printing operation) has been executed. If it is determined that copying has been executed, the process proceeds to step S100. If it is determined that copying has not yet been performed, the process proceeds to step S10. return.

  In step S100, the central controller 100 adds and updates the number of prints in the print number storage unit 103 for the brand (corresponding to the paper feed tray) used for printing.

  Further, the central controller 100 determines whether or not a jam has occurred in step S110. If the central controller 100 determines that the jam has occurred, the central controller 100 determines in step S120 about the brand used for printing in the jam count storage unit 104, and Then, the number of jams is updated by updating the number of occurrences at that time.

  According to the present embodiment described above, in the image forming apparatus 1, for each brand of paper stored in the paper feed tray, the paper cost of the brand is calculated from the price of the paper, the number of printed sheets, and the number of jam occurrences. Is done. When a certain sheet cassette is selected to be used for printing, the cost calculated as described above is displayed on the operation panel 110 for the sheet cassette.

<Second Embodiment>
In the second embodiment of the image forming apparatus 1, the number of sheets remaining in the image forming apparatus 1 when a jam occurs is also stored. The cost of each brand is calculated including the remaining number.

FIG. 12 is a diagram schematically illustrating a functional configuration of the image forming apparatus 1 according to the second embodiment.
Compared with FIG. 3, the image forming apparatus 1 of the present embodiment further includes an in-machine remaining number storage unit 121 as its function.

FIG. 13 is a diagram schematically showing the contents stored in the in-machine remaining number storage unit 121.
FIG. 13 shows the total number of sheets remaining due to the occurrence of a jam at each jam occurrence location.

  In FIG. 13, “A4 horizontal”, “A4 vertical”, and “B4 vertical” indicate the respective paper feed trays. For example, “A4 landscape” in FIG. 13 corresponds to the paper feed tray 71. “A4 vertical” in FIG. 13 corresponds to the paper feed tray 72. In FIG. 13, information about three types of paper feed trays is shown. In this regard, since the image forming apparatus 1 has four paper feed trays, the in-machine residual number storage unit 121 may store information on the four types of paper feed trays.

  As described with reference to FIG. 5, in the image forming apparatus 1, paper brands are associated with each paper feed tray. For this reason, storing the remaining number of sheets for each paper feed tray corresponds to storing the remaining number of sheets for each brand.

  In FIG. 13, “single-sided”, “double-sided”, and “post-processing” indicate print modes that were selected when a jam occurred. For example, “single-sided” corresponds to a single-sided printing mode. “Double-sided” corresponds to the double-sided printing mode. Note that the single-sided printing mode and the double-sided printing mode are exclusive printing modes. The single-sided printing mode is a printing mode that does not use the duplex unit 82, and the duplex printing mode is a printing mode that does not use the duplex unit 82. “Post processing” corresponds to a printing mode with post processing. The post-processing is a printing mode in which post-processing is performed on the paper after image formation using at least one of the punch unit 87, the folding unit 88, or the stapler 89. As for the print mode in which single-sided printing is performed with post-processing, both “single-sided” and “post-processing” printing modes are selected.

  That is, the in-machine remaining number storage unit 121 stores the total number of remaining sheets due to a jam for each brand of the sheet, for each printing mode, and for each portion where the sheet remains.

  FIG. 14 is a flowchart for calculating the paper cost in the present embodiment. The flowchart in FIG. 14 corresponds to a modification of the flowchart in FIG.

  Referring to FIG. 14, in step SA10, central control apparatus 100 acquires the brand of paper associated with the paper feed tray specified (selected) in step S10 in FIG. 5, and advances the process to step SA11.

  In step SA11, central control apparatus 100 acquires the print mode currently set for the job to be executed, and advances the process to step SA20.

  In step SA20, the central controller 100 acquires the price of the branded paper acquired in step SA10 from the paper price information storage unit 108, and advances the process to step SA30.

  In step SA30, central control apparatus 100 acquires the number of printed brands acquired in step SA10 from printed number storage unit 103, and advances the process to step SA40.

  In step SA40, the central controller 100 acquires the number of jams of the brand acquired in step SA10 from the jam count storage unit 104, and advances the process to step SA41. Here, the total number of jams in the jam location in the range corresponding to the set print mode is acquired as the number of jams.

  In step SA41, central controller 100 searches for the most likely jam of each brand and advances the process to step SA42. In the process of step SA41, the remaining number of remaining sheets is stored for the brand selected in step SA10 and the printing mode acquired in step SA11 in the in-machine remaining number storage unit 121 as described with reference to FIG. It is realized by specifying the location. For example, when a brand corresponding to a paper feed tray that stores sheets is acquired at step SA10 as “A4 landscape” and a printing mode of “single side” (no post-processing) is selected at step SA11, step SA41 is performed. In FIG. 13, the “sheet discharge unit” with the largest remaining number of sheets in “A4 side” “one side” in FIG. 13 is acquired as the most likely jam.

  Returning to FIG. 14, in step SA42, the central controller 100 acquires the number stored in the in-machine remaining number storage unit 121 at the location acquired in step SA41, and proceeds to step SA43. In the above example, “3”, which is the number of “sheet discharge units” of “one side” of “A4 landscape”, is acquired.

  In step SA43, the central controller 100 acquires the number of jam occurrences in the jam count storage unit 104 at the location where the in-machine remaining number is acquired in step SA42, and advances the process to step SA44. Specifically, in step SA43, the central control apparatus 100 acquires the number of jams at the location acquired in step SA41 for the brand acquired in step SA10 in the jam count storage unit 104. More specifically, when the brand acquired in step SA10 is “A” and the location acquired in step SA41 is “paper discharge unit”, the jam of the paper discharge unit of “A” paper in FIG. “1” which is the number of times is acquired.

  In step SA44, central controller 100 calculates the cost of the jam factor according to the following equation (2), and proceeds to step SA45.

Jam factor cost = paper price + (number of jams / number of printed sheets) (2)
In equation (2), the paper price is the price of the paper corresponding to the brand acquired in step SA10 (see FIG. 4). The number of jams is the number of jams acquired in step SA43. The number of printed sheets is the number of printed sheets corresponding to the brand acquired in step SA10 (see FIG. 6).

  In step SA45, central controller 100 calculates the cost of the residual factor according to the following equation (3), and proceeds to step SA51.

Residual factor cost = (paper price * number of remaining paper in the machine where jamming is most likely)
* (Number of jams / number of printed pages where jamming is most likely) ... (3)
In other words, first, the product value of “paper price” and “the number of remaining paper in the machine where jamming is most likely to occur” is calculated, and then the value obtained by dividing “number of printings” from “the number of jams where the paper is most likely to jam”. Is calculated, and the product of the former value and the latter value is calculated, whereby the cost of the residual factor is calculated. “Remaining number in the machine at the place where jamming is most likely to occur” is the value acquired in step SA42. The “number of jams at the place where jamming is most likely” is the value acquired in step SA43.

  In step S51, the central controller 100 calculates a sheet cost according to the following equation (4), and returns the process to FIG.

Paper cost = Paper price + Cost of jam factor + Cost of residual factor (4)
In equation (4), “cost of jamming factor” is the value calculated in step SA44, and “cost of residual factor” is the value calculated in step SA45.

  In the present embodiment described above, the jam count measuring unit 107 also detects the remaining number of sheets remaining in the image forming apparatus 1 when a jam occurs, and the in-machine residual as shown in FIG. The number is stored in the number storage unit 121. That is, in the present embodiment, the jam number measuring unit 107 constitutes a remaining sheet number measuring unit.

  In this embodiment, the remaining number of sheets is added to the sheet cost as the residual factor cost, and the cost is calculated from the remaining number.

  Further, in the present embodiment, as the residual factor cost, a loss due to paper remaining when a jam occurs is calculated. As described in Equation (3), the loss is calculated based on the number of printed sheets and the number of occurrences of jam for each brand of paper, and a value corresponding to the frequency for each brand of paper. is there.

  In the present embodiment, as described in Equation (4), the loss corresponding to the remaining number of sheets is added to calculate the cost of the sheet.

  Further, in the present embodiment, as described as Expression (4), the paper cost is calculated by adding the cost of the jam factor calculated in Step SA44, so that the paper cost calculating unit For each brand of paper, the jam frequency is calculated based on the number of printed sheets and the number of jam occurrences, and the cost is calculated by adding a loss corresponding to the frequency.

<Third Embodiment>
In the image forming apparatus 1, as described in this specification, the cost of the paper is calculated by various methods. In the third embodiment of the image forming apparatus 1, if the cost calculated for the paper in the selected paper feed tray is higher than the reference value stored in the reference paper cost information storage unit 101, that fact. Is notified.

FIG. 15 is a modification of the sheet cost display flowchart of FIG.
Referring to FIG. 15, in step SB10, central controller 100 causes operation panel 110 (display unit 111) to display the reference sheet cost (reference value) and the sheet cost of the brand to be displayed. Then, the process proceeds to step SB20.

  In step SB20, it is determined whether or not the cost of the selected paper feed tray brand is higher than the cost reference value stored in the reference paper cost information storage unit 101, and the former is determined to be higher than the latter. Then, the process proceeds to step SB30. On the other hand, when determining that this is not the case, the central controller 100 returns the process to FIG. 9 as it is.

  In step SB30, central control apparatus 100 issues a warning on operation panel 110 to warn that the cost of the brand of the selected paper is higher than the reference value, and returns the process to FIG.

  FIG. 16 is a diagram illustrating a state where the warning message is displayed on the operation panel 110 of the image forming apparatus 1. In the screen 710 of FIG. 16, a message “! Paper cost exceeds the reference value” is further displayed in the message display field 716 compared to the screen 700 of FIG. 11.

  Thereby, even if the user intends to select a sheet with a low price, when the cost calculated based on the result of jam or the like in the image forming apparatus 1 is higher than the reference value, the user recognizes that fact. Can do.

<Fourth embodiment>
In the image forming apparatus 1, a numerical value input from the operation panel 110 may be stored as a reference value stored in the reference sheet cost information storage unit 101, or one or more stored in the sheet price information storage unit 108. The price of one brand selected from the prices of the brands may be stored.

  Accordingly, the user can register the reference value more easily, and can register a value in accordance with the actual situation as the reference value in a situation where the image forming apparatus 1 is used.

<Fifth embodiment>
In the fifth embodiment of the image forming apparatus 1, when a paper feed tray to be used for printing is selected, a brand corresponding to the paper feed tray is specified, and a print mode with the lowest cost for the brand is selected. Is displayed as the recommended print mode.

FIG. 17 is a modification of the flowchart of FIG.
In the flowchart of FIG. 17, after the sheet cost is displayed in step S50, the recommended print mode is displayed in step S51. Even after the sheet cost is displayed in step S80, the recommended print mode is displayed in step S81.

  FIG. 18 is a flowchart of a subroutine for displaying the recommended print mode in steps S51 and S81.

  Referring to FIG. 18, in step SC10, central controller 100 acquires the brand of paper corresponding to the paper feed tray selected at that time, and proceeds to step SC20. The tray is selected by default or in step S30.

  In step SC20, central controller 100 obtains the price of the brand paper obtained in step SC10 from paper price information storage unit 108, and advances the process to step SC30.

  In step SC30, central controller 100 acquires the number of prints of the brand acquired in step SC10 from print number storage unit 103, and advances the process to step SC40.

  In step SC40, the central controller 100 obtains the minimum value from the number of jams of each of the paper feed unit, the conveyance unit, and the transfer unit, and advances the processing to step SC50 using the value as the number of jams on one side. The number of jams is the number of jams of each part stored in the jam number storage unit 104 for the brand acquired in step SC10. Here, “single-sided” means a single-sided printing mode.

  In step SC50, central controller 100 calculates the sheet cost for one side according to the following equation (5), and proceeds to step SC60.

Paper cost on one side = paper price + (number of jams on one side / number of printed sheets) (5)
Here, the paper price and the number of printed sheets are the price and the number of printed sheets for the brand of the paper acquired in step SC10.

  In step SC60, the central controller 100 obtains the minimum value from the number of jams for each of the paper feed unit, the conveyance unit, the transfer unit, and the double-sided unit, and processes that value as the number of jams for double-sided processing. To proceed. The number of jams is the number of jams of each part stored in the jam number storage unit 104 for the brand acquired in step SC10. Here, “both sides” means a duplex printing mode.

  In step SC70, central controller 100 calculates the sheet cost for double-sided according to the following equation (6), and proceeds to step SC80.

Paper cost on both sides = paper price + (number of jams on both sides / number of printed sheets) (6)
Here, the paper price and the number of printed sheets are the price and the number of printed sheets for the brand of the paper acquired in step SC10.

  In step SC80, the central controller 100 determines whether or not the one-sided paper cost calculated in step SC50 is higher than the two-sided paper cost calculated in step SC70, and if so, in step SC100. Then, a display that recommends the double-sided printing mode is performed, and the process returns to FIG. On the other hand, if it is determined that the one-sided paper cost is equal to or lower than the two-sided paper cost, in step S90, a display that recommends the single-sided printing mode is performed, and the process returns to FIG.

FIG. 19 is a diagram illustrating an example of a display that recommends the single-sided printing mode.
On the screen 720 in FIG. 19, the pop-up image 725 shows a printing mode of “single side → single side” as a recommended mode.

  FIG. 20 is a diagram illustrating an example of a modified example of the print number storage table. In the image 725 of FIG. 19, the elements included in the print mode displayed as the recommended mode include “paper size” and “paper setting direction”. In such a case, it may be necessary to store the number of printed sheets for each paper brand, paper size, and paper setting direction as in the “printed number storage table” shown in FIG. Similarly, the number of jams, paper price information, and the remaining number in the machine may need to be stored for each paper brand, paper size, and paper setting direction.

<Sixth Embodiment>
In the sixth embodiment of the image forming apparatus 1, when a print mode is selected, a paper feed tray corresponding to a brand with the lowest cost for the print mode is displayed as a recommended paper feed tray.

FIG. 21 is still another modification of the flowchart of FIG.
In the flowchart of FIG. 21, instead of displaying the paper cost in step S50 in FIG. 8, the paper cost and the recommended paper feed tray are displayed in step S52. In FIG. 8, instead of displaying the paper cost in step S80, the paper cost and the recommended paper feed tray are displayed in step S82.

  FIG. 22 is a flowchart of a subroutine for displaying the sheet cost and the recommended paper feed tray in steps S52 and S82.

  Referring to FIG. 22, in step SD10, central controller 100 acquires the currently selected print mode, and proceeds to step SD20.

  In step SD20, the central controller 100 calculates the cost of the stored paper for each paper feed tray, and proceeds to step SD30. The paper cost calculation method is as described with reference to FIGS. 9 and 14, for example. However, the cost corresponding to the print mode acquired in step SD10 is calculated here. That is, when the single-sided printing mode is selected, the number of jams of the paper feeding unit, the conveyance unit, and the transfer unit is used as the number of jams. When the double-sided printing mode is selected, the number of jams of the paper feeding unit, the transport unit, the transfer unit, and the double-sided unit is used as the number of jams.

  In step SD30, the central controller 100 acquires the minimum value among the sheet costs calculated in step SD20, and advances the process to step SD40.

  In step SD40, the central control device 100 displays the cost corresponding to the print mode for the selected tray, and displays the recommendation to use the tray with the lowest sheet cost, and returns the processing to FIG. .

FIG. 23 is a diagram showing an example of display in step SD40.
In the image 735 pop-up displayed on the screen 730 in FIG. 23, the paper cost for the tray selected as “paper cost” is displayed, and the “recommended tray” is displayed as “the lowest paper cost” as described above. "Tray"("Tray(1)" in FIG. 23) is displayed.

<Seventh embodiment>
In the image forming apparatus 1, the paper brand determination unit 105 may be able to detect the brand of the paper set in each paper feed tray by an optical technique or the like.

  In the seventh embodiment of the image forming apparatus 1, the paper brand determination unit 105 detects, for example, the glossiness of the surface of the paper set in each paper feed tray, and thereby detects each paper feed tray. The brand of the set paper is specified, and information as shown in FIG. 5 is created.

  Further, the paper brand determination unit 105 calculates the specific gravity of the paper, specifies the brand of the paper set in each paper feed tray based on the specific gravity, and creates information as shown in FIG. The paper brand determination unit 105 can detect the volume of the paper stored in each paper feed tray by detecting the position of each surface of the rectangular parallelepiped constituted by the bundle of paper in each paper feed tray. Further, the paper brand determination unit 105 can obtain the weight of the stored paper, for example, by calculating the difference between the empty weight of each paper feed tray and the weight of the paper stored state. . Then, from these values, the paper brand determination unit 105 can calculate the specific gravity of the paper.

  In addition, when the paper brand determination unit 105 is configured to detect both the glossiness and the specific gravity, the paper brand determination unit 105 can distinguish and recognize two or more brands having different glossiness or specific gravity. it can.

<Other variations>
In the image forming apparatus 1, the price of each brand of paper (FIG. 4) may be input from a user or a service person via the operation panel 110 or the like, and the paper cost calculation unit 109 is information for identifying the brand. May be obtained via an appropriate server on the network.

<Effects of the embodiment>
According to the image forming apparatus 1 described above, the user can accurately know the cost of paper. For this reason, even if a low-priced sheet is used to reduce the sheet cost, if the cost is actually higher than expected, this can be notified to the user. Therefore, as a result, the user can use a sheet with a substantially low cost.

  Each embodiment disclosed this time must be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims. In addition, the invention described in the embodiment and each modification is intended to be carried out independently or in combination as much as possible.

  DESCRIPTION OF SYMBOLS 1 Image forming apparatus, 20 Printing apparatus, 30 Paper conveyance apparatus, 70 Paper feed part, 71-74 Paper feed tray, 76 Pickup roller, 79 Registration roller, 80 Fixing apparatus, 82 Duplex unit, 87 Punch unit, 88 Folding unit, 89 Stapler, 90 Paper discharge unit, 91-93 Paper discharge tray, 100 Central controller, 101 Reference paper cost information storage unit, 102 Jam detection unit, 103 Number of printed sheets storage unit, 104 Jam number storage unit, 105 Paper brand judgment unit , 106 Number of printed sheets measurement unit, 107 Number of jam measurement units, 108 Paper price information storage unit, 109 Paper cost calculation unit, 110 Operation panel, 111 Display unit, 112 Operation unit, 121 In-machine residual number storage unit, 150K, 150Y, 150M , 150C imaging unit, 1 52 RAM, 153 ROM, 154 storage unit, 155 output control unit, 700, 710, 720, 730 screen, 701 to 704 software buttons, 705, 725, 735 image, 716 message display field.

Claims (12)

Image forming means for performing an image forming operation;
A paper feed tray for storing paper supplied for image formation by the image forming means;
A number-of- printing-sheet measuring means for measuring the number of printed sheets for each brand of paper stored in the paper feed tray;
A jam count measuring means for measuring the number of jam occurrences for each brand of paper stored in the paper feed tray;
Paper price information storage means for storing a price for each brand of paper stored in the paper feed tray;
For each brand of paper stored in the paper feed tray, a paper cost calculation unit that calculates the cost of the brand paper from the price, the number of printed sheets, and the number of jam occurrences;
An image forming apparatus comprising: a display unit configured to display a sheet cost calculated by the sheet cost calculating unit. For each printing mode and jam occurrence location, the printer further comprises a remaining sheet number measuring means for measuring the remaining number of sheets that is the number of sheets remaining in the image forming apparatus when a jam occurs.
The image forming apparatus according to claim 1, wherein the sheet cost calculating unit further calculates the cost from the remaining number of sheets. Reference value storage means for storing a reference value for the cost is further provided,
The image forming apparatus according to claim 1, wherein the display unit displays the cost together with a reference value. A designating unit for designating a brand of paper used for image formation by the image forming unit;
The image forming apparatus according to claim 3, wherein when the cost of the brand designated by the designation unit is higher than the reference value, the display unit displays the fact. The jam count measuring means further stores the number of jam occurrences for each print mode,
The paper cost calculating unit calculates the cost for each printing mode in the image forming unit,
The image forming apparatus according to claim 4, wherein the display unit displays a brand having the lowest cost for the brand designated by the designation unit.   The image forming apparatus according to claim 3, further comprising a setting unit that sets the reference value from the price stored in the paper price information storage unit. . The paper cost calculation means includes
For each brand of paper, calculate the jam frequency based on the number of printed sheets and the number of jam occurrences,
The image forming apparatus according to claim 1, wherein the cost is calculated by adding a loss corresponding to the frequency. For each printing mode and jam occurrence location, the printer further comprises a remaining sheet number measuring means for measuring the remaining number of sheets that is the number of sheets remaining in the image forming apparatus when a jam occurs.
The paper cost calculation means includes
For each brand of paper, calculate the jam frequency based on the number of printed sheets and the number of jam occurrences,
The cost is calculated by adding the loss corresponding to the frequency and the loss corresponding to the remaining number of sheets for each brand of the paper, and calculating the cost. The image forming apparatus described in the item. The jam count measuring means measures the jam count for each print mode,
The paper cost calculating unit calculates the cost for each printing mode in the image forming unit,
A mode designating unit for designating a printing mode for image formation by the image forming unit;
The image forming apparatus according to claim 1, wherein the display unit displays a brand having the lowest cost for the print mode designated by the designation unit.   10. The image forming apparatus according to claim 1, further comprising a paper brand discriminating unit that discriminates a brand of paper set in the paper feed tray. 11. Control of the image forming apparatus executed by the image forming apparatus including an image forming unit for executing an image forming operation and a paper feed tray for storing paper supplied for image formation by the image forming unit A method,
Measuring the number of printed sheets for each brand of paper stored in the paper feed tray;
Measuring the number of jam occurrences for each brand of paper stored in the paper feed tray;
Storing a price for each brand of paper stored in the paper feed tray;
For each brand of paper stored in the paper feed tray, calculating the cost of the brand paper from the price, the number of printed sheets and the number of jam occurrences;
And a step of displaying the calculated cost of the sheet. Image formation executed by a computer of an image forming apparatus including an image forming unit for executing an image forming operation and a paper feed tray for storing paper supplied for image formation by the image forming unit A control program for the device,
The control program is stored in the computer.
Measuring the number of printed sheets for each brand of paper stored in the paper feed tray;
Measuring the number of jam occurrences for each brand of paper stored in the paper feed tray;
Storing a price for each brand of paper stored in the paper feed tray;
For each brand of paper stored in the paper feed tray, calculating the cost of the brand paper from the price, the number of printed sheets and the number of jam occurrences;
And a step of displaying the calculated cost of the sheet.

Images