Recording apparatus and control method thereof

Abstract

To provide a recording device capable of reducing an error in estimating a residual amount of a roll sheet.SOLUTION: A recording device comprises a setting part where information about a roll sheet having a recording sheet wound is set by a user, a calculation part for calculating an estimated value of a residual amount of the roll sheet based on the information set by the setting part, an acquisition part for acquiring a correction value for correcting the estimated value based on a discrepancy between the estimated value of the residual amount of the roll sheet calculated by the calculation part and an actual residual amount of the roll sheet, a storage part for storing the correction value, and a reset part for resetting the correction value stored in the storage part when the information about the roll sheet is changed by the setting part.SELECTED DRAWING: Figure 7

Description

[Technical field]

[0001] The present invention relates to a technique for estimating the remaining amount of a roll sheet in a recording device. [Background technology]

[0002] Printing devices and other recording devices have a function for estimating the remaining amount of roll paper that has been fed. The remaining amount of roll paper can be calculated from the amount of roll paper transport, the amount of rotation of the roll paper, the diameter of the roll paper core, and the thickness of the roll paper. The diameter of the roll paper core and the thickness of the roll paper can be changed by the user.

[0003] Patent Document 1 describes a method for improving the accuracy of remaining amount estimation by providing a means for detecting the end of the roll paper, and recording the error between the remaining amount estimation result and the actual remaining amount when the end of the roll paper is detected as a correction value. It is believed that the remaining amount estimation result can be improved by reflecting this correction value in the next remaining amount estimation result. Even if the user does not set the core diameter or thickness correctly, the correction value can reduce the error in the remaining amount estimation when using roll paper of the same paper type and the same core diameter. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2020-158282 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, with the technology described in Patent Document 1, when a user uses roll paper with a different core diameter, estimating the remaining amount using the correction value that had been stored up until that point can result in a large error and the remaining amount estimation result can be significantly off.

[0006] The present invention has been made in consideration of the above-mentioned problems, and has an object to reduce errors in estimating the remaining amount of a roll sheet. [Means for solving the problem]

[0007] A recording device according to the present invention includes a setting means for allowing a user to set information about a roll sheet on which a sheet for recording is wound, a calculation means for calculating an estimated value of a remaining amount of the roll sheet based on the information set by the setting means, an acquisition means for acquiring a correction value for correcting the estimated value based on an error between the estimated value of the remaining amount of the roll sheet calculated by the calculation means and an actual remaining amount of the roll sheet, a storage means for storing the correction value, and a reset means for resetting the correction value stored in the storage means when the information about the roll sheet is changed by the setting means. The resetting means does not reset the correction value for a roll sheet of a sheet type having only a specific core diameter. It is characterized by: Effect of the Invention

[0009] According to the present invention, it is possible to reduce errors in estimating the remaining amount of the roll sheet. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a perspective view showing a schematic configuration of a recording apparatus according to a first embodiment of the present invention. [Diagram 2] FIG. 4 is a top view of a portion of the recording apparatus that supplies and transports roll paper. [Diagram 3] 5A and 5B are diagrams for explaining the concept of calculating the remaining amount of roll paper. [Figure 4] 11A and 11B are diagrams showing how the end portion of the roll paper separates from the core. [Diagram 5] 11 is a diagram showing changes in actual remaining amount and estimated remaining amount. [Figure 6] 4 is a flowchart showing an image recording operation in the recording device. [Figure 7] 5 is a flowchart showing a remaining capacity estimation operation in the first embodiment. [Figure 8]10 is a flowchart showing a remaining capacity estimation operation in the second embodiment. [Figure 9] 13 is a flowchart showing a remaining capacity estimation operation in the third embodiment. [Figure 10] 11 is a flowchart showing an operation of inquiring of a user whether the core diameter setting is correct. [Figure 11] FIG. 13 is a diagram showing a panel display for asking the user whether the core diameter setting is correct. [Figure 12] 13 is a flowchart showing an operation of inquiring about a core diameter in the fifth embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, the embodiments will be described in detail with reference to the attached drawings. Note that the following embodiments do not limit the invention according to the claims. Although the embodiments describe a number of features, not all of these features are essential to the invention, and the features may be combined in any manner. Furthermore, in the attached drawings, the same reference numbers are used for the same or similar configurations, and duplicated descriptions are omitted.

[0012] (First embodiment) FIG. 1 is a perspective view showing a schematic configuration of a recording device 100 according to a first embodiment of the present invention. FIG. 2 is a top view of a portion of the recording device 100 of this embodiment that supplies and transports roll paper, and a block diagram showing a control configuration. The recording device 100 is an inkjet recording device that includes a supply unit for supplying roll paper (roll sheet), a transport unit for transporting the supplied roll paper, and a printing unit for printing an image on the roll paper. The recording device 100 shown in FIG. 1 is shown as having only a printing function, but the recording device of the present invention is not limited to this, and may be further equipped with a reading device for reading an image on a document to function as a copier, or may be a multi-function device with other functions added.

[0013] In Figures 1 and 2, roll paper 1 is wound around a hollow cylindrical core. The spool shaft of spool 2 is inserted into the core of roll paper 1, and spool 2 is rotatably held in housing 3a of roll paper supply unit 3. A roll drive motor 6 rotates spool 2 via gear 5, allowing roll paper 1 to rotate together with spool 2. Spool 2 is provided with a rotation amount detector 4 consisting of a rotary encoder. This makes it possible to detect the amount of rotation of spool 2 and roll paper 1.

[0014] Paper (sheet) M supplied from the roll paper supply unit 3 passes through the transport path and reaches a transport roller pair consisting of a transport roller 8 and a pinch roller 9. The transport roller 8 is rotatably held in the housing 3a, and a transport motor 12 rotates the transport roller 8 via a gear 11. The paper M is sandwiched between the transport roller 8 and the pinch roller 9, and is transported in the direction indicated by the arrow H as they rotate. The transport path is provided with an edge detection sensor 50 (see FIG. 3) that detects the edge of the paper, located between the spool 2 and the transport roller 8. In addition, a transport amount detector 10 consisting of a rotary encoder is arranged on the transport roller 8, and the amount of rotation of the transport roller 8 can be detected.

[0015] The printing unit includes a recording head 7, a platen facing the recording head 7, and a scanning mechanism including a guide shaft 13. The paper M transported to the printing unit has its posture corrected so that it is aligned with the platen. The guide shaft 13 is provided at a position between the spool 2 and the transport roller 8 in the transport direction of the paper M. The recording head 7 can reciprocate along the guide shaft 13 in a direction intersecting the transport direction of the paper M (direction indicated by arrow H). The recording head 7 can record a predetermined image on the paper M by ejecting ink while moving back and forth.

[0016] The recording device 100 is controlled by the CPU 22. The recording device 100 may also include an operation unit that issues various instructions such as setting the type of roll paper (sheet type) and width, paper supply operation, and printing operation. It may also include an interface unit that can connect to an external device such as a personal computer and send and receive various commands and printing information. These components are controlled by the CPU 22. Furthermore, when performing paper supply operation or printing operation, information recorded in the recording unit 24 is referenced.

[0017] The control unit 26 controls the rotation amount detector 4, the conveying amount detector 10, the end detection sensor 50, the carriage encoder, the ammeters of various motors, acquires measurement values, controls the drive of the roll drive motor 6, the conveying motor 12, and the carriage motor (not shown), and controls the ejection of ink, etc.

[0018] The spool 2 and transport roller 8 are driven to rotate based on commands from the control unit 26. The acquisition unit 23 detects the output current of the roll drive motor 6 and transport motor 12, and calculates the friction load torque applied to the roll paper 1. The recording unit 24 records information correlating the mass of the roll paper 1 with the friction load torque as friction load information. The estimation unit 25 estimates the moment of inertia of the roll paper 1 based on the mass of the roll paper 1 calculated from the friction load torque. The friction load information is calibrated by the calibration unit 27 as necessary. The control unit 26 controls the roll drive motor 6 and transport motor 12 based on the estimated moment of inertia.

[0019] When paper M is pulled out from the roll paper 1 and transported in the direction indicated by arrow H, any slack occurring upstream of the transport roller 8 will result in reduced transport accuracy. Therefore, when transporting paper M in the direction indicated by arrow H, the roll drive motor 6 applies a rotational load torque to the roll paper 1 in the opposite direction to the direction of arrow H to prevent slack from occurring.

[0020] Next, we will explain how to calculate the remaining amount of roll paper 1. Figure 3 is a diagram showing the block configuration inside the control unit 26 and the arrangement of sensors in the recording device 100, to explain the concept of calculating the remaining amount of roll paper 1. The remaining amount is calculated using values ​​from each sensor.

[0021] The thickness acquisition unit 15 acquires the thickness T of the paper (sheet thickness) from the thickness sensor 14. The thickness sensor 14 is an optical sensor that detects the thickness of the paper without contact, and is mounted on the recording head 7. Therefore, by scanning the recording head 7, the thickness can be detected from the step between the paper M and the platen. In this case, since it is non-contact, the roll paper is not scratched. The thickness sensor may be a contact type sensor that passes the paper M through a roller and measures the thickness by the displacement of the roller. In this case, the thickness of the paper M can be directly measured while the paper M is being transported. Also, the thickness may be configured to be set by the user.

[0022] The transport amount acquisition unit 16 acquires the transport amount P of the paper M from the transport amount detector 10 of the transport roller 8. The rotation amount acquisition unit 17 acquires the rotation amount θ of the roll paper 1 from the rotation amount detector 4 that detects the rotation amount of the spool 2. The core diameter acquisition unit 18 acquires the value of the core diameter Rc according to a user input.

[0023] The outer diameter Rx of the roll paper 1 can be calculated by outer diameter calculation unit 19 from the transport amount P detected by transport amount detector 10 and the rotation amount θ detected by rotation amount detector 4. In other words, it is considered that the transport amount P when the roll paper 1 rotates matches the rotation amount (Rx × θ / 2) of the outer periphery of the roll paper 1. Therefore, the outer diameter Rx is obtained by Equation 1. Note that the outer diameter is a diameter, and θ is expressed in rads.

[0024] Rx=2P / θ…Equation 1 Next, the remaining amount calculation unit 20 calculates (estimates) the remaining amount D (length) of the roll paper 1 using the outer diameter Rx of the roll paper 1 calculated by Equation 1, the core diameter Rc, and the thickness T of the paper M acquired by the thickness acquisition unit 15. At this time, the area (Rx 2 -Rc 2)×π / 4 is considered to be equal to the rectangular cross-sectional area (T×D) of paper M supplied from roll paper 1. Therefore, by adding the distance I in the transport path from roll paper 1 to edge detection sensor 50, the remaining amount D (length) of roll paper is obtained by Equation 2.

[0025] D = π(Rx 2 -Rc 2 ) / 4T+I … Equation 2 Note that the change in the area of ​​the ring caused by feeding the roll paper may be used as the thickness T of the paper M. In other words, when the outer diameter of the roll paper 1 changes from R1 to R2, if the length of the transported roll paper is Pb, the thickness T of the paper M can be obtained by Equation 3.

[0026] T = π(R1 2 -R2 2 ) / 4Pb …Equation 3 The remaining amount D of roll paper is calculated based on formula 2. However, if the user inputs the core diameter, there will be input errors, and if the user measures it, there will be measurement errors. In other words, it is possible that roll paper can be supplied even though the remaining amount of roll paper 1 is zero, or that there is no roll paper 1 even though the remaining amount is not zero.

[0027] Therefore, a correction value is provided to correct the remaining amount of the roll paper 1 based on the remaining amount error, and is stored in a storage unit such as a memory. The initial value of the correction value is 0. Here, when the end of the roll paper 1 is detected, the correction value stored in the storage unit is updated.

[0028] Figure 4 shows how the end of the roll paper 1 leaves the core and is detected by the end detection sensor 50. Figure 4(a) shows the state where the roll paper 1 (paper M) remains on the core. As the spool 2 rotates further from this state, the end of the roll paper 1 (paper M) leaves the core and is detected by the end detection sensor 50 (Figure 4(b)). In other words, it is possible to detect the change from a state where the roll paper 1 remains on the core to a state where it is no longer remaining on the core.

[0029] The control unit 26 detects that the trailing edge of the paper M has passed the edge detection sensor 50. When the controller 26 detects the trailing edge, it performs a specified transport and printing operation, and then stops the operation of supplying the paper M, transporting the paper M, and printing. If the trailing edge of the roll paper 1 is firmly fixed to the core, the trailing edge of the roll paper 1 will not separate from the core. In this case, the trailing edge cannot be detected, but the amount of rotation detected by the rotation amount detector 4 and the amount of transport detected by the transport amount detector 10 are not updated. As a result, it can be determined that the trailing edge of the roll paper 1 has been reached.

[0030] The control unit 26 obtains from the remaining amount calculation unit 20 the remaining amount of the roll paper 1 when the roll paper 1 separates from the core just before the end is detected. The remaining amount at this point is an estimation error from the remaining amount estimation, and is a correction value that must be corrected. Therefore, this remaining amount is stored in the recording unit 24 as a correction value corresponding to the type of roll paper. The user removes the spool 2 from the recording device 100 and replaces the roll paper. If the same type of roll paper 1 is installed, the correction value is used to calculate the remaining amount. In this way, even if the user sets an incorrect value for the core diameter Rc, it is possible to accurately calculate the remaining amount.

[0031] However, there is a possibility that a correct value will be set as the core diameter Rc by the user while using the recording device 100. In this case, since the above correction value is a correction value for the remaining amount calculated based on the core diameter before correction, if the correction value is used to correct the remaining amount calculated based on the correct core diameter, an error will occur in the remaining amount estimation result.

[0032] FIG. 5 is a graph showing the change in the actual remaining capacity and the estimated remaining capacity.

[0033] FIG. 5(a) shows an example in which the user has set the core diameter to a value smaller than the actual core diameter. The state in which the roll paper 1 is first loaded is taken as the initial state (501), with the user-set core diameter being 57.0 mm, the actual core diameter being 82.5 mm, and the actual remaining amount being 100 m. In this case, the remaining amount D of the roll paper 1 calculated using formula 2 is 140 m, a value much larger than the actual remaining amount. When the control unit 26 detects the end of the roll paper 1 (502), the previous remaining amount of the roll paper is 40 m. Therefore, the correction value is -40 m.

[0034] If the user removes spool 2 from here and installs roll paper 1 of the same paper type without changing the core diameter setting, the remaining amount D is corrected by the correction value, and the actual remaining amount and the estimated remaining amount become approximately equal (503).

[0035] However, suppose that, while using the recording device 100, the user realizes that he or she has forgotten to set the core diameter and changes the core diameter from 57.0 mm to 82.5 mm. In this case, since the remaining amount D is calculated based on the corrected core diameter, when the actual remaining amount becomes, for example, 100 m, the remaining amount D is calculated to be approximately the same value as the actual remaining amount. In other words, it is possible to estimate the remaining amount almost accurately. Nevertheless, if the estimated remaining amount is corrected using the above remaining amount correction value -40 m, the calculated remaining amount D becomes 60 m, which is different from the actual remaining amount of 100 m. If printing is continued in this state, it will be determined that there is no remaining amount even though there is actually remaining amount. To prevent such a problem, in this embodiment, when the core diameter is changed by the user, the remaining amount correction value is reset (504). As a result, the actual remaining amount and the calculated remaining amount D become approximately the same value.

[0036] FIG. 5(b) shows an example in which the user has set the core diameter to a value larger than the actual core diameter. The state in which the roll paper is first loaded is taken as the initial state (505), with the user-set core diameter being 82.5 mm, the actual core diameter being 57.0 mm, and the actual remaining amount being 100 m. In this case, the remaining amount D of roll paper 1 calculated using equation 2 will be a value such as 60 m, which is much smaller than the actual remaining amount. When the control unit 26 detects the end of the roll paper (506), the previous remaining amount of roll paper is -40 m. Therefore, the correction value is 40 m.

[0037] If the user removes spool 2 from here and installs roll paper 1 of the same paper type without changing the core diameter setting, the remaining amount D is corrected by the correction value, and the actual remaining amount and the estimated remaining amount become approximately equal (507).

[0038] However, suppose that while using the recording device 100, the user realizes that he or she has forgotten to set the core diameter and changes the core diameter from 82.5 mm to 57.0 mm. In this case, since the remaining amount D is calculated based on the corrected core diameter, when the actual remaining amount becomes, for example, 100 m, the remaining amount D is calculated to be approximately the same value as the actual remaining amount. In other words, it is possible to estimate the remaining amount almost accurately. Nevertheless, if the estimated remaining amount is corrected using the above remaining amount correction value of 40 m, the calculated remaining amount D becomes 140 m, which is different from the actual remaining amount of 100 m. If printing is continued in this state, it will be determined that there is enough paper even though there is no actual remaining amount. To prevent such a problem, in this embodiment, when the core diameter is changed by the user, the remaining amount correction value is reset (508). As a result, the actual remaining amount and the calculated remaining amount D become approximately the same value.

[0039] FIG. 6 is a flow chart showing the image recording operation in the recording device 100. As shown in FIG.

[0040] When a user instructs the recording device 100 to record an image, this flowchart starts in step S600. First, in step S601, paper M for recording an image is pulled out from the roll paper 1 and fed. When feeding is completed, in step S602, the transport roller 8 transports the paper M to the image recording start position. When transport is completed, in step S603, the recording head 7 performs a recording operation. In step S604, it is confirmed whether or not the recording of the image is completed up to the end of the image, and steps S602 to S603 are repeated until completion. When it is determined in step S604 that the recording of the image is completed up to the end of the image, in step S605, the transport roller 8 transports the paper M to the cutting position. When transport is completed, in step S606, the paper M is cut. When the paper M is cut, the remaining amount of the roll paper 1 changes. Therefore, at this timing, the remaining amount is estimated in step S607. The details of the remaining amount estimation will be described later. Thereafter, in step S608, the cut printed paper is discharged, and the process ends in step S609.

[0041] FIG. 7 is a flow chart showing the operation of resetting the correction value in the remaining amount estimation. After the cutting operation in step S606 in FIG. 6 is completed, the remaining amount estimation starts in step S700. In step S701, the current core diameter setting value is acquired. In step S702, the acquired core diameter setting value is compared to determine whether it is the same value as the core diameter acquired in the previous remaining amount estimation. If the core diameters are the same in step S702, the correction value is not reset in step S705, and the remaining amount estimation is performed according to formula 2, and the remaining amount estimation ends in step S706. If the core diameters are different in step S702, the core diameter setting has been changed by the user, so the correction value is reset in step S703. In step S704, the current core diameter is stored. In step S705, the remaining amount of the roll paper 1 is estimated according to formula 2, and the process ends in step S706.

[0042] The timing for resetting the correction value is not limited to the timing for estimating the remaining amount, but may be the timing for changing the core diameter by the user. Also, the timing for estimating the remaining amount is not limited to the timing for recording an image, but may be the timing for turning on the recording device 100 or the timing for feeding paper.

[0043] In the above embodiment, an example was described in which the correction value was reset when the core diameter setting was changed by the user, but the roll paper information set by the user could also be the thickness of the roll paper, etc. Therefore, the correction value may be reset when the thickness of the roll paper is changed.

[0044] Second embodiment There are many third-party manufacturers of ordinary recording paper such as plain paper, and the core diameters vary. When using roll paper of this type, there is a high possibility that the user will set the core diameter incorrectly. Therefore, resetting the correction value is very effective. However, there are also paper types that only have specific core diameters. When roll paper of this type is used, it is unlikely that the user will set the core diameter incorrectly, so it is considered better not to reset the correction value every time the core diameter is changed.

[0045] FIG. 8 is a flowchart showing the operation of resetting the correction value in the remaining amount estimation in the second embodiment. When the remaining amount estimation is started in step S800, the current paper type of the roll paper is acquired in step S801. In step S802, it is determined whether the paper type is plain paper. If it is determined in step S802 that the paper type is not plain paper, the remaining amount is estimated according to formula 2 in step S807, and the process ends in step S808. If it is determined in step S802 that the paper type is plain paper, the current core diameter setting value is acquired in step S803. In step S804, it is determined whether the acquired core diameter setting value is the same as the core diameter acquired in the previous remaining amount estimation. If the core diameter is the same in step S804, the remaining amount is estimated according to formula 2 without resetting the correction value in step S807, and the remaining amount estimation ends in step S808. If the core diameter is different in step S804, the core diameter setting has been changed by the user, so the correction value is reset in step S805. In step S806, the current core diameter is stored. In step S807, the remaining amount is estimated according to Equation 2, and the process ends in step S808.

[0046] (Third embodiment) In the first and second embodiments, a method for resetting the correction value when the core diameter is changed by the user has been described. With this method, it is possible to reduce errors in the remaining amount estimation result due to the correction value. However, if the user changes the core diameter setting but the setting does not match the actual core diameter, an error will occur in the remaining amount estimation result due to the discrepancy in the core diameter. Also, there is a possibility that an error will occur in the remaining amount estimation result due to factors other than the core diameter.

[0047] Therefore, in this embodiment, a correction value is prepared for each core diameter, and when the core diameter is changed by the user, the correction value according to the core diameter is used.

[0048] 9 is a flowchart showing the operation of selecting a correction value performed when estimating the remaining amount. When estimation of the remaining amount starts in step S900, the current setting value of the core diameter is acquired in step S901. In step S902, a correction value corresponding to the acquired core diameter is acquired. In step S903, the remaining amount is estimated using the acquired correction value, and in step S904, estimation of the remaining amount is ended.

[0049] The timing for acquiring the correction value is not limited to when the remaining amount is estimated, but may be when the core diameter setting is changed by the user.

[0050] (Fourth embodiment) If the estimated remaining amount D of the roll paper 1 is zero but the roll paper can still be supplied, it is highly likely that the core diameter setting is incorrect. Therefore, in this embodiment, if the estimated remaining amount D is calculated to be zero, the user is queried as to whether the core diameter setting is correct.

[0051] FIG. 10 is a flowchart showing an operation of inquiring of the user as to whether the core diameter setting is correct. After estimating the remaining amount using any of the methods of FIG. 7, FIG. 8, and FIG. 9, this flowchart starts in step S1000. In step S1001, it is determined whether the remaining amount D calculated by estimating the remaining amount is zero. If the remaining amount D is not zero in step S1001, the process of this flowchart ends in step S1003. If the calculation result of the remaining amount D is zero in step S1001, the user is inquired as to whether the core diameter setting is correct in step S1002. The panel display when making the inquiry will be described later. Once the inquiry to the user is completed, the process of this flowchart ends in step S1003.

[0052] FIG. 11 is a diagram showing an example of a panel display when the estimated remaining amount D is zero but the end of the roll paper has not been detected. When the estimated remaining amount D becomes zero, the screen shown in FIG. 11(a) is first presented to the user. Here, the current core diameter is presented, and the user is asked to confirm whether the set value of the core diameter is correct. If "YES" is selected, the core diameter is correct, so it is considered that the remaining amount estimation result is deviated due to factors other than the core diameter. Therefore, nothing is done at this timing, and the correction value is updated according to the first embodiment when the end of the roll paper 1 is detected. However, without being limited to this, the correction value may be reset when it is determined that the remaining amount estimation result is deviated due to factors other than the core diameter.

[0053] If "NO" is selected on the screen in FIG. 11(a), the core diameter setting is incorrect, so the screen shown in FIG. 11(b) is presented to the user. The user selects "Enter value" to input the correct core diameter. After inputting the correct core diameter, they select "OK." If the user selects "OK," the screen transitions to the idle screen and ends. The screens shown in FIGS. 11(a) and 11(b) may be displayed whenever a roll paper is fed, not just when there is a discrepancy between the actual remaining amount and the estimated remaining amount.

[0054] Fifth embodiment If the roll paper 1 is out even though the remaining amount is not zero, it is highly likely that the setting value for the core diameter of the roll paper that was just fed is incorrect. Therefore, in this embodiment, the user is queried as to whether the setting of the core diameter was correct, in the same way as in Figures 10 and 11.

[0055] FIG. 12 is a flowchart of the operation of inquiring about the core diameter. When the user finishes setting according to FIG. 11, this flow starts in step S1200. In step S1201, it is determined whether the core diameter setting is correct or incorrect. If the core diameter setting is correct (YES) in step S1201, the correction value corresponding to the currently set core diameter is updated in step S1202, and the process ends in step S1206. If the core diameter setting is incorrect in step S1201, it is determined in step S1203 whether the core diameter setting has been changed by the user. If it is determined in step S1203 that the setting has been changed, it is determined that an incorrect core diameter correction value has been used up until that point, so the correction value of the changed core diameter is updated in step S1204, and the process ends in step S1206. If it is determined in step S1203 that the set value has not been changed, the correction value corresponding to the current core diameter is updated in step S1205, and the process ends in step S1206.

[0056] (Other embodiments) The present invention can also be realized by a process in which a program for realizing one or more functions of the above-mentioned embodiments is supplied to a system or device via a network or a storage medium, and one or more processors in a computer of the system or device read and execute the program. The present invention can also be realized by a circuit (e.g., ASIC) for realizing one or more functions.

[0057] The invention is not limited to the above-described embodiments, and various modifications and variations are possible without departing from the spirit and scope of the invention. Accordingly, the following claims are appended to apprise the public of the scope of the invention. [Explanation of symbols]

[0058] 2: spool, 3: roll paper supply section, 4: rotation amount detector, 6: roll drive motor, 7: recording head, 8: transport roller, 9: pinch roller, 50: end detection sensor

Claims

1. a setting means for allowing a user to set information about a roll sheet on which a sheet for recording is wound; a calculation means for calculating an estimated remaining amount of the roll sheet based on the information set by the setting means; an acquisition means for acquiring a correction value for correcting the estimated remaining amount of the rolled sheet based on an error between the estimated remaining amount of the rolled sheet calculated by the calculation means and an actual remaining amount of the rolled sheet; A storage means for storing the correction value; a resetting means for resetting the correction value stored in the memory means when the information about the roll sheet is changed by the setting means; Equipped with The recording device according to claim 1, wherein the resetting means does not reset the correction value for a roll sheet of a sheet type having only a specific core diameter.

2. 2. The recording apparatus according to claim 1, wherein the resetting means resets the correction value when the setting of the core diameter as the information about the roll sheet is changed by the setting means.

3. 2. The recording apparatus according to claim 1, wherein the resetting means resets the correction value when the setting of the sheet thickness as the information about the roll sheet is changed by the setting means.

4. 4. The recording apparatus according to claim 1, wherein the resetting means resets the correction value at the timing when the calculating means calculates the estimated value.

5. 4. The recording apparatus according to claim 1, wherein the resetting means resets the correction value at a timing when the information about the rolled sheet is changed by the setting means.

6. 6. The recording apparatus according to claim 1, further comprising an inquiry unit that, when the estimated value does not match the actual remaining amount of the roll sheet, inquires of a user as to whether the information about the roll sheet is correct.

7. 7. The recording apparatus according to claim 6, wherein the inquiry unit inquires of a user as to whether the information about the rolled sheet is correct when the remaining amount of the rolled sheet becomes zero.

8. 8. The recording apparatus according to claim 6, further comprising a unit for prompting a user to change a setting of the information about the rolled sheet when the information about the rolled sheet is incorrect.

9. 8. The recording apparatus according to claim 6, further comprising a resetting unit that resets the correction value when the information about the roll sheet is correct.

10. 7. The recording apparatus according to claim 6, wherein the inquiry means, when the estimated value is not zero and the actual remaining amount of the rolled sheet is zero, inquires of a user as to whether the information about the rolled sheet is correct.

11. A method for controlling a recording apparatus having a setting unit for allowing a user to set information about a roll sheet on which a sheet for recording is wound, comprising the steps of: a calculation step of calculating an estimated remaining amount of the roll sheet based on the information set by the setting means; an acquisition step of acquiring a correction value for correcting the estimated value based on an error between the estimated value of the remaining amount of the rolled sheet calculated in the calculation step and an actual remaining amount of the rolled sheet; a storage step of storing the correction value in a storage means; a resetting step of resetting the correction value stored in the memory means when the information about the roll sheet is changed by the setting means; having The control method for a recording device, wherein in the resetting step, the correction value is not reset for a roll sheet of a sheet type having only a specific core diameter.

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