JP2008001488A - Paper remaining amount detection device and method, program, and storage medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a paper remaining amount storage device and method, a program and a storage medium capable of accurately detecting a paper remaining amount (remained number of paper sheets) in a paper storage unit not depending on thickness of the paper sheets. <P>SOLUTION: The paper remaining amount detection device is provided with a stack amount detection sensor 101 and a paper reduction amount detection sensor 102. The stack amount detection sensor 101 detects the entire thickness of the paper sheets 103 stacked on a stack base 105 in the paper storage unit 100. The stack amount detection sensor 101 performs predetermined treatment to the read signal by a control part not shown and stores it in a storage element as a stack amount A. The paper reduction amount detection sensor 102 detects an amount of paper sheets reduced as compared with the initial stack amount and stores it in the similar storage element after a predetermined number of paper sheets stacked in the paper storage unit 100 are fed by a paper feeding device not shown by the image forming device in printing. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a remaining paper amount detection device and method, a program, and a storage medium for detecting the remaining amount of paper stacked and stored in a paper storage unit.

  A conventional example will be described with reference to FIGS.

  9A and 9B are diagrams schematically illustrating a configuration of a paper storage unit of an image forming apparatus according to a conventional example, in which FIG. 9A shows a state in which a paper supply door of a paper storage unit (not shown) is opened, and FIG. 9B shows a paper supply door. Indicates a closed state.

  When the paper replenishing door is opened, the stacking base 1003 in the storage area 1001 is moved to the lowest position by a pulse motor which is a driving means (not shown). When the sheet bundle is replenished and the sheet replenishing door is closed, the stacking table 1003 is raised by the driving means. The paper detection sensor 1002 detects the presence of paper when the flag 1005 is pushed in at the upper end of the paper bundle 1004, and the stacking base 1003 stops rising.

  FIG. 10 is a diagram illustrating an example of a display device that displays the sheet stacking amount in the sheet storage unit of FIG. 9.

  A control unit (not shown) of the image forming apparatus counts the number of pulses applied to the pulse motor that has driven the loading table 1003, and controls the display device according to the result. The number of pulses is such that the sheet replenishment door is closed and the sheet replenishment door is closed from the state in which the sheet replenishment door is open and the stacking base 1003 is at the lowermost part of the storage area. This is until the loading platform 1003 stops rising. (A) shows a case where the load amount is large, and (b) shows a case where the load amount is small.

  Patent Document 1 proposes a technique shown in FIGS. 11 and 12.

  As shown in FIGS. 11 and 12, a paper weight detection piece 35 is incorporated in the paper feed direction guide member 34. The placement portion 35 a of the paper weight detection piece 35 is biased upward by the elastic force of the spring 38. The operating portion 35b of the sheet weight detecting piece 35 is provided inside the vertical portion 34a of the paper feeding direction guide member 34, and a micro switch is provided on the inner wall surface of the paper feeding direction guide member 34 so as to face the tip of the operating portion 35b. 39 is disposed.

When there are more sheets 29 than the set number, the microswitch 39 is in an OFF state. When feeding of the paper 29 progresses and reaches the set number, the micro switch 39 is turned on to detect the presence or absence of the paper with the predetermined number of papers as a threshold.
JP 05-105271 A

  However, in the above conventional example, since the thickness of the entire stacked paper in the paper storage unit is relatively detected, it is difficult to determine the total number of paper. In addition, since the number of stacked sheets varies depending on the thickness of the sheet, problems such as variations in the number of jobs that can be processed have occurred.

  An object of the present invention is to provide a remaining sheet storage device and method, a program, and a storage medium capable of accurately detecting the remaining sheet quantity (the number of remaining sheets) in the sheet storage unit regardless of the sheet thickness. There is.

  In order to achieve the above object, a sheet remaining amount detection device according to claim 1 includes: a first sheet thickness detection unit that detects the thickness of the entire sheet stacked on the sheet storage unit; and the sheet storage unit. A sheet counting means for counting the number of fed sheets, and a second for detecting a thickness corresponding to a change from the thickness detected by the first sheet thickness detecting means after the sheets are fed from the sheet storage unit. Paper thickness detection means, the first paper thickness detection means, the second paper thickness detection means, detection of the paper counting means, and the remaining amount of paper loaded in the paper storage unit is detected from the counting result. A sheet remaining amount detecting unit and a display unit for displaying the remaining sheet amount detected by the sheet remaining amount detecting unit are provided.

  The sheet remaining amount detecting device according to claim 5, a rising means for raising a sheet stacking plate of the sheet storage unit, a sheet thickness detecting means for detecting the thickness of the entire sheet stacked on the sheet storage unit, A sheet counting unit that counts the number of sheets fed from the sheet storage unit, a rising amount detection unit that detects a distance raised by the lifting unit after feeding a predetermined number of sheets from the sheet storage unit, and the sheet thickness A detection unit, a detection unit for detecting the amount of increase, a detection unit for detecting the amount of paper, and a detection unit for detecting a remaining amount of paper loaded on the sheet stacking plate of the paper storage unit based on a counting result; And display means for displaying the remaining amount of paper detected by the detection means.

  According to a sixth aspect of the present invention, there is provided a first sheet thickness detecting step for detecting a total thickness of sheets stacked on the sheet storage unit, and counting the number of sheets fed from the sheet storage unit. A paper counting step; a second paper thickness detecting step for detecting a thickness corresponding to a change from the thickness detected in the first paper thickness detecting step after feeding the paper from the paper storage unit; A first paper thickness detection step, a second paper thickness detection step, a detection of the paper counting step, a remaining paper amount detection step of detecting a remaining amount of paper loaded in the paper storage unit from a counting result, And a display step for displaying the remaining amount of paper detected in the remaining paper amount detecting step.

  The paper remaining amount detecting method according to claim 7, wherein the ascending step of raising the paper stacking plate of the paper storage unit, the paper thickness detecting step of detecting the total thickness of the paper stacked on the paper storage unit, A sheet counting step for counting the number of sheets fed from the sheet storage unit, a rising amount detection step for detecting a distance raised by the rising step after feeding a predetermined number of sheets from the sheet storage unit, and the sheet thickness A detection step, a detection step of the rising amount, a detection of the paper counting step, a paper remaining amount detection step of detecting a remaining amount of paper loaded on the paper stacking plate of the paper storage unit from the counting result, and the paper remaining amount And a display step for displaying the remaining amount of paper detected by the detection step.

  The sheet remaining amount detection program according to claim 8 counts the number of sheets fed from the sheet storage unit and a first sheet thickness detection module that detects the total thickness of the sheets stacked in the sheet storage unit. A paper counting module; a second paper thickness detection module that detects a thickness of a change from a thickness detected by the first paper thickness detection module after feeding paper from the paper storage unit; A first paper thickness detection module, a second paper thickness detection module, a detection of the paper counting module, a remaining paper amount detection module for detecting a remaining amount of paper stacked on the paper storage unit from a counting result, A display module for displaying the remaining amount of paper detected by the remaining paper amount detecting module is executed by a computer.

  The sheet remaining amount detection program according to claim 9 is a rising module that raises a sheet stacking plate of a sheet storage unit, a sheet thickness detection module that detects the thickness of the entire sheet stacked on the sheet storage unit, A sheet counting module for counting the number of sheets fed from the sheet storage unit, a rising amount detection module for detecting a distance raised by the lifting module after feeding a predetermined number of sheets from the sheet storage unit, and the sheet thickness A detection module, a rising amount detection module, a detection by the paper counting module, a remaining paper detection module for detecting a remaining amount of paper loaded on the paper stacking plate of the paper storage unit from the counting result, and the remaining paper amount Let the computer run a display module that displays the remaining amount of paper detected by the detection module And features.

  A computer-readable storage medium according to a tenth aspect stores the remaining paper amount detection program according to the eighth aspect.

  A computer-readable storage medium according to an eleventh aspect stores the remaining paper amount detection program according to the ninth aspect.

  The sheet remaining amount display device according to the present invention includes a first sheet thickness detection unit that detects the thickness of the entire sheet stacked on the sheet storage unit, and a sheet counting unit that counts the number of sheets fed from the sheet storage unit. With. In addition, a second sheet thickness detection unit that detects a thickness corresponding to a change from the thickness detected by the first sheet thickness detection unit after the sheet is fed from the sheet storage unit. In addition, the first sheet thickness detecting unit, the second sheet thickness detecting unit, the sheet counting unit, the remaining sheet amount detecting unit for detecting the remaining sheet amount loaded on the sheet storage unit from the counting result, Display means for displaying the remaining amount of paper detected by the amount detection means. That is, the remaining amount of paper loaded in the paper storage unit is detected from the detection of the first paper thickness detection means, the second paper thickness detection means, the paper counting means, and the counting result. Accordingly, the remaining amount of paper (the number of remaining paper sheets) in the paper storage unit can be accurately detected regardless of the thickness of the paper.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a diagram schematically showing a configuration of a remaining paper amount detection apparatus according to the first embodiment of the present invention.

  In FIG. 1, the remaining paper amount detection device includes a stack amount detection sensor 101 and a paper loss detection sensor 102.

  The stack amount detection sensor 101 detects the thickness of the entire sheet 103 stacked on the stacking platform 105 in the sheet storage unit 100. Reference numeral 104 denotes the top surface of the sheet. The load detection sensor 101 is a line sensor that includes a light emitting unit and a light receiving unit (not shown), performs predetermined processing on a read signal by a control unit (not shown), and stores it as a load A in a storage element. .

  The sheet reduction detection sensor 102 detects the amount of paper that has been reduced from the initial stacking amount after the image forming apparatus has fed a predetermined number of sheets 103 stacked in the sheet storage unit 100 by a sheet feeding device (not shown) by printing. And stored in a similar storage element.

  The sheet reduction detection sensor 102 is movable in the sheet stacking direction by a moving device (not shown), and is controlled to move so that the top surface 104 of the sheet is included in the sensor range according to the detection value of the stack amount detection sensor 101.

  FIG. 2 is a diagram illustrating an example of the configuration of the paper loss detection sensor in FIG.

  In FIG. 2, the paper loss detection sensor 102 includes a semiconductor laser 201 and a light receiving sensor 202.

  The side surface of the paper loaded by the semiconductor laser 201 is irradiated, the reflected light is received by the light receiving sensor 202 constituted by an area sensor, the read image is subjected to a predetermined process, and stored in the storage element.

  FIG. 3 is a diagram illustrating an example of an image detected by the paper loss detection sensor of FIG.

  As shown in FIG. 3, the images near the upper surface of the stacked sheets before feeding (a) and after (b) are compared, and the decrease in the sheet is detected at the distance of the changed portion. By using such means, it is possible to easily detect even when the number of sheets is reduced.

  Further, the same effect can be obtained by using a line sensor such as the load detection sensor 101 as the paper loss detection sensor 102. In this case, detection with higher accuracy is possible by using a line sensor with higher resolution than the load detection sensor 101.

  FIG. 4 is a flowchart showing the procedure of the remaining paper amount detection process in the remaining paper amount detection apparatus of FIG.

  In FIG. 4, a control unit (not shown) of the image forming apparatus determines whether or not there is an event of “OFF → ON” of the power source of the image forming apparatus or the sheet storage unit (step S401). When “OFF → ON” is detected, the thickness of the entire sheet stacked in the sheet storage unit 100 is detected by the stack amount detection sensor 101 and stored as the detection value A in the first storage device of the control unit. (Step S403).

  At this time, the detected value A is compared with the first threshold value T1 (step S404). If “A ≦ T1”, it is determined that there is no paper in the paper storage unit 100, and the control unit displays a message requesting the paper storage unit 100 to replenish paper on a display device (not shown) (step S405). Then, the process ends.

  In this case, the first threshold value T1 is given as a fixed value as a detection limit value of the load amount detection sensor 101.

  If “A ≦ T1” is not satisfied, it is determined whether or not the position of the paper loss detection sensor 102 is appropriate (step S406). If not, the sensor is detected according to the detection value of the load detection sensor 101 as described above. Movement control is performed so that the upper surface of the stacked paper is included in the range.

  When feeding is started (steps S408 and S409), the control unit counts the number of fed sheets and compares it with a predetermined value n (step S410). The predetermined value n is set as a fixed value depending on the sensitivity of the paper loss detection sensor 102.

  Paper is fed until the number of fed sheets reaches n (step S411), and then the paper reduction detection sensor 102 detects the reduction and stores it as a detection value B in the second storage device of the control unit (step S412).

  The control unit calculates the remaining load N from the detection values A, B, and n as follows (step S413) and displays it on the display device (step S414).

  When paper is fed from the paper storage unit 100 from the above state, the remaining load N is updated and displayed on the display device according to the number of fed paper (steps S415, S416, S417).

  When the remaining amount N is compared with the second threshold value T2 and “N ≦ T2” is satisfied, the control unit displays a message for requesting paper replenishment to the paper storage unit 100 on a display device (not shown) (step S405). ). In this case, the second threshold value T2 may be a predetermined value, or may be changed according to, for example, the job size currently being executed by the image forming apparatus.

  If there is no “power OFF → ON”, the control unit further determines whether the paper storage unit 100 has been opened or closed (step S402). If there is an open / close, there is a possibility that the paper has been replenished. Therefore, the processing shifts to the detection of the stacking amount (step S403). The amount is set to N (step S414) and the process is continued.

  When the paper storage unit 100 has a large capacity, there is a mechanism that has a mechanism for moving the stacking unit up and down to always control the upper surface of the stacked paper to the paper feed position. Will be described with reference to FIG.

  FIG. 5 is a diagram schematically showing a configuration of a remaining paper amount detection apparatus according to the second embodiment of the present invention.

  In FIG. 5, the remaining paper amount detection apparatus includes a stacking upper surface detection sensor 501 and a stacking plate detection sensor 504. The stacked upper surface detection sensor 501 is attached to the unit top plate 502 of the paper storage unit 500. The stacking plate detection sensor 504 is attached to the unit bottom plate 505 of the paper storage unit 500. The loading plate 503 moves up and down supported by the columns 506 and 507.

  FIG. 5A shows a state where there is no paper in the paper storage unit. The stacking plate 503 is raised to a predetermined position detected by a stacking upper surface detection sensor 501 installed on the unit top plate 502 by a pulse motor (not shown). A control unit (not shown) stores the number of driving pulses of the pulse motor at this time as “p” in the storage device.

  FIG. 5B shows a state where the door of the paper storage unit 500 is opened. The loading plate 503 is lowered to a predetermined position detected by a loading plate detection sensor 504 installed on the unit bottom plate 505 by a pulse motor (not shown). The number of driving pulses of the pulse motor at this time is stored as “P0” by a control unit (not shown) in the storage device. FIG. 5C shows a state in which an appropriate amount of paper is replenished and stacked in this state.

  Next, a state in which the door of the paper storage unit 500 is opened is shown in FIG. When the control unit detects that the door is closed, it drives the pulse motor to raise the stacking plate 503 again, and stops when the stacking upper surface detection sensor 501 detects the upper surface of the stacked paper.

  The control unit also stores the number of drive pulses from when the stacking plate detection sensor 504 detects the stacking plate 503 to when the stacking upper surface detection sensor 501 detects the upper surface of the stacked sheets as “P1” in the storage device. From the above operation, if the amount of movement of the stacking plate per pulse is 1, the thickness L of the entire stacked sheet can be detected by the following formula.

  Incidentally, “α” in the equation is a correction value, for example, an offset amount due to the thickness of the loading plate. Since the operations from the reduction detection to the remaining amount calculation after the paper feeding operation are the same, the description is omitted.

  Although the paper loss detection sensor 102 has been described with reference to the configuration shown in FIG. 2, the paper reduction detection sensor in the case of the paper storage unit 500 that moves the stacking plate 503 to always move the upper surface of the stacked paper to the paper feed position is also shown in FIG. It is the same composition as.

  FIG. 6 is a diagram schematically showing a configuration of a paper loss detection sensor used in the paper remaining amount detection device of FIG.

  In FIG. 6, the paper loss detection sensor 600 includes a semiconductor laser 601 and a light receiving sensor 602.

  As shown in FIG. 6, the thickness corresponding to the number of sheets fed is detected by reading the side image of the loaded paper, comparing it with the side image of the loaded paper that has been moved, and detecting the movement distance. Can be detected.

  FIG. 7 is a diagram illustrating an example of an image detected by the paper loss detection sensor of FIG. FIG. 8 is a flowchart showing the procedure of the remaining sheet detection process in the remaining sheet detection apparatus in FIG.

  FIG. 7A shows an example of an image read by the paper loss detection sensor 600 in the state of FIG.

  In FIG. 8, first, this image is read (step S801), feature pixels are extracted by predetermined image processing (step S802), and stored in the storage device of the control unit. As an example, feature pixels extracted from the region shown in FIG. 7B are shown in FIG.

  When a predetermined number of sheets is fed, the stacking plate 503 starts to move, and the entire stacked sheet is raised (steps S803 to S805). The stop position after rising may be, for example, the timing at which the upper surface of the sheet is detected by the stacking upper surface detection sensor 501.

  After the stop, the image is read again by the paper loss detection sensor 600 (step S806). The image at that time is shown in FIG. The feature image (pixel) of this image is detected (step S807), and the moving distance from the feature pixel (FIG. 7C) stored in the storage device is calculated (step S808), and the sheet is fed. The thickness corresponding to the number of sheets can be detected.

  In addition, an object of the present invention is to supply a storage medium in which a program code of software for realizing the functions of the embodiment is recorded to a system or apparatus, and a computer (or CPU, MPU, etc.) of the system or apparatus stores the storage medium It is also achieved by reading out and executing the program code stored in.

  In this case, the program code itself read from the storage medium realizes the functions of the above-described embodiments, and the program code and the storage medium storing the program code constitute the present invention.

  Examples of the storage medium for supplying the program code include a floppy (registered trademark) disk, a hard disk, a magneto-optical disk, a CD-ROM, a CD-R, a CD-RW, a DVD-ROM, a DVD-RAM, and a DVD. -RW, DVD + RW, magnetic tape, nonvolatile memory card, ROM, etc. can be used. Alternatively, the program code may be downloaded via a network.

  Further, by executing the program code read by the computer, not only the functions of the above-described embodiments are realized, but also an OS (operating system) running on the computer based on the instruction of the program code. A case where part or all of the actual processing is performed and the functions of the above-described embodiments are realized by the processing is also included.

  Further, after the program code read from the storage medium is written in a memory provided in a function expansion board inserted into the computer or a function expansion unit connected to the computer, the function expansion is performed based on the instruction of the program code. This includes the case where the CPU or the like provided in the board or the function expansion unit performs part or all of the actual processing and the functions of the above-described embodiments are realized by the processing.

1 is a diagram schematically illustrating a configuration of a remaining paper amount detection device according to a first embodiment of the present invention. FIG. 2 is a diagram illustrating an example of a configuration of a paper loss detection sensor in FIG. 1. FIG. 3 is a diagram illustrating an example of an image detected by a paper loss detection sensor in FIG. 2. 2 is a flowchart illustrating a procedure of a remaining paper amount detection process in the remaining paper amount detection apparatus of FIG. 1. It is a figure which shows schematically the structure of the paper residual amount detection apparatus which concerns on the 2nd Embodiment of this invention. FIG. 6 is a diagram schematically showing a configuration of a paper loss detection sensor used in the paper remaining amount detection device of FIG. 5. It is a figure which shows an example of the image detected by the paper weight loss detection sensor of FIG. 6 is a flowchart illustrating a procedure of a remaining paper amount detection process in the remaining paper amount detection apparatus of FIG. 5. It is a figure which shows schematically the structure of the paper storage unit of the image forming apparatus which concerns on a prior art example. FIG. 10 is a diagram illustrating an example of a display device that displays a paper stacking amount in the paper storage unit of FIG. 9. It is a figure which shows schematically the structure of the paper storage unit of the image forming apparatus which concerns on another prior art example (the 1). It is a figure which shows schematically the structure of the paper storage unit of the image forming apparatus which concerns on another prior art example (the 2).

Explanation of symbols

100 Paper storage unit 101 Load amount detection sensor (first paper thickness detection means)
102 Paper loss detection sensor (second paper thickness detection means)
Step S403 First paper thickness detection means Step S409 Paper counting means Step S412 Second paper thickness detection means Step S413 Paper remaining amount detection means Step S414 Display means Step S805 Lifting means

Claims (11)

First sheet thickness detection means for detecting the thickness of the entire sheet stacked in the sheet storage unit;
Paper counting means for counting the number of sheets fed from the paper storage unit;
Second paper thickness detection means for detecting a change in thickness from the thickness detected by the first paper thickness detection means after feeding paper from the paper storage unit;
A first sheet thickness detection unit, a second sheet thickness detection unit, a detection by the sheet counting unit, a remaining sheet detection unit that detects the remaining amount of sheets stacked on the sheet storage unit based on a counting result;
Display means for displaying the remaining amount of paper detected by the remaining paper amount detecting means;
A remaining paper amount detection device comprising:   2. The remaining paper amount detecting device according to claim 1, wherein the first paper thickness detecting means is a line sensor.   2. The paper remaining amount detecting device according to claim 1, wherein the second paper thickness detecting means is a sensor using a laser interference pattern.   3. The sheet remaining amount detecting device according to claim 2, wherein the second sheet thickness detecting means is a line sensor having a resolution higher than that of the line sensor according to claim 2. A raising means for raising the paper stacking plate of the paper storage unit;
A paper thickness detection means for detecting the thickness of the entire paper loaded in the paper storage unit;
Paper counting means for counting the number of sheets fed from the paper storage unit;
A rising amount detection means for detecting a distance raised by the lifting means after feeding a predetermined number of sheets from the paper storage unit;
A sheet remaining amount detecting means for detecting the remaining amount of sheets stacked on the sheet stacking plate of the sheet storage unit from the counting result, the detection of the sheet thickness detecting means, the rising amount detecting means, the sheet counting means, and the counting result;
Display means for displaying the remaining amount of paper detected by the remaining paper amount detecting means;
A remaining paper amount detection device comprising: A first paper thickness detection step for detecting the thickness of the entire paper loaded in the paper storage unit;
A paper counting step for counting the number of sheets fed from the paper storage unit;
A second paper thickness detection step of detecting a thickness corresponding to a change from the thickness detected in the first paper thickness detection step after feeding the paper from the paper storage unit;
A first paper thickness detection step, a second paper thickness detection step, a detection of the paper count step, a remaining paper amount detection step of detecting a remaining amount of paper loaded in the paper storage unit from a count result;
A display step for displaying the remaining amount of paper detected by the remaining paper amount detecting step;
A method for detecting a remaining amount of paper. An ascending step for raising the paper stacking plate of the paper storage unit;
A paper thickness detection step for detecting the thickness of the entire paper loaded in the paper storage unit;
A paper counting step for counting the number of sheets fed from the paper storage unit;
A rising amount detecting step for detecting a distance raised by the rising step after feeding a predetermined number of sheets from the paper storage unit;
A paper remaining amount detecting step for detecting the remaining amount of paper loaded on the paper stacking plate of the paper storage unit from the counting result, detection of the paper thickness detecting step, the rising amount detecting step, the paper counting step, and the counting result;
A display step for displaying the remaining amount of paper detected by the remaining paper amount detecting step;
A method for detecting a remaining amount of paper. A first paper thickness detection module that detects the thickness of the entire paper loaded in the paper storage unit;
A paper counting module for counting the number of sheets fed from the paper storage unit;
A second paper thickness detection module that detects a thickness corresponding to a change from the thickness detected by the first paper thickness detection module after feeding the paper from the paper storage unit;
A first paper thickness detection module, a second paper thickness detection module, a detection of the paper counting module, a remaining paper detection module for detecting a remaining amount of paper stacked in the paper storage unit from a counting result;
A display module for displaying the remaining amount of paper detected by the remaining amount detection module;
A program for detecting the remaining amount of paper, which causes a computer to execute. A lifting module for lifting the paper stacking plate of the paper storage unit;
A paper thickness detection module for detecting the thickness of the entire paper stacked in the paper storage unit;
A paper counting module for counting the number of sheets fed from the paper storage unit;
A rising amount detection module for detecting a distance raised by the rising module after feeding a predetermined number of sheets from the paper storage unit;
The sheet thickness detection module, the rising amount detection module, the detection of the sheet counting module, a remaining sheet detection module for detecting the remaining amount of sheets stacked on the sheet stacking plate of the sheet storage unit from the counting result;
A display module for displaying the remaining amount of paper detected by the remaining amount detection module;
A program for detecting the remaining amount of paper, which causes a computer to execute.   A computer-readable storage medium for storing the remaining paper amount detection program according to claim 8.   A computer-readable storage medium storing the remaining paper amount detection program according to claim 9.

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