JP2016179677A - Liquid consumption device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid consumption device which can be used without stopping even though a careful attention is not given to the timing of liquid replenishment and the amount of replenishment, and does not generate empty jetting.SOLUTION: A printer 110 to which an ink tank 11 that contains an ink is fixed and that is configured such that a user can refill the ink tank 11 with the ink includes: a consumption amount calculation unit 42 that calculates a consumption amount of the ink; a storage unit 50 that stores a count value that is updated based on the consumption amount of the ink calculated by the consumption amount calculation unit 42; a pair of electrodes that detects whether or not the ink is present at a predetermined position in the ink tank 11; and a control unit 40 that executes ink presence/absence detection with the pair of electrodes. The control unit 40 resets the count value to an initial value thereof if the control unit executes the ink presence/absence detection and determines that the ink is present before the count value is reset to the initial value.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a liquid consuming apparatus.

  As an example of a liquid consuming apparatus, an ink jet printer (hereinafter simply referred to as a printer) is known. In a printer, ink, which is an example of a liquid, is stored in an ink tank, which is an example of a liquid container, and printing can be performed by ejecting ink from a print head onto a print medium such as print paper. In such a printer, if ink is consumed and there is no ink to be ejected, the printer becomes idle. In order to avoid this, the amount of ink used is pseudo-counted by the so-called ink dot count method to manage the remaining amount of ink, and when the count value exceeds the value corresponding to the capacity of the ink tank, the ink has run out. Has been proposed (for example, see Patent Document 1).

  In the printer described in Patent Document 1, when the open / close cover is opened for 5 seconds or more, a display asking the user whether the ink tank has been replaced is displayed. Then, after the user replaces the ink tank that has run out of ink with an ink tank filled with ink, and inputs that the ink tank has been replaced according to the display, the count value corresponding to the amount of ink used is reset. Reset processing is executed.

JP 2004-74694 A

  By the way, the printer described in Patent Document 1 is based on the premise that the ink tank is replaced, and does not consider a configuration in which the user can replenish ink to the ink tank fixed to the printer. In the configuration in which the ink tank is replaced, the initial ink amount in the ink tank does not vary, and therefore there is an initial deviation between the count value and the actual ink usage in the ink remaining amount management. Absent. On the other hand, when the user refills the ink tank with ink, the user refills the ink before the printer warns that the ink has run out, or the initial amount of ink in the ink tank after the user refills. As a result, the deviation tends to occur between the count value and the actual amount of ink used in managing the remaining amount of ink. Then, although there is ink in the ink tank, there is a concern that the printer may bother the user by warning that the ink has run out accidentally based on the count value.

  Further, the printer described in Patent Document 1 does not include a sensor that detects a decrease in the remaining amount of ink in the ink tank. Therefore, there is a possibility that the printer runs out of ink before warning that the printer has run out of ink.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms or application examples.

  Application Example 1 A liquid consuming apparatus according to this application example is a liquid consuming apparatus in which a liquid container that stores a liquid is fixed, and a user can replenish the liquid in the liquid container. A consumption calculation unit for calculating consumption, a storage unit for storing a count value updated based on the consumption of liquid calculated by the consumption calculation unit, and the liquid at a predetermined position in the liquid container A sensor for detecting whether or not there is a liquid, and a control unit for detecting whether or not the liquid is present by the sensor, the control unit returning the count value to an initial value If the liquid presence / absence detection is executed before the reset process is executed and it is determined that the liquid is present, the reset process is executed.

  According to the configuration of this application example, the liquid consuming device is configured so that the user can replenish liquid in the liquid container, and in addition to the count value by the dot count method, The remaining amount of liquid is managed by detecting whether or not there is. Therefore, even if there is a deviation between the count value and the actual liquid consumption, the sensor can detect a decrease in the remaining amount of liquid. Risk that occurs can be reduced. Further, for example, when the user replenishes the liquid and the actual remaining amount of the liquid is larger than the remaining amount of the liquid based on the count value, the control unit performs the presence / absence detection of the liquid and determines that there is the liquid. For example, the count value is reset to the initial value without any input operation by the user. Therefore, an erroneous warning that there is no liquid remaining based on the count value despite the actual liquid remaining is not generated. As a result, the user can continue to use the liquid consuming device without paying close attention to the timing of replenishing the liquid, the amount of liquid at the time of replenishment, input operations, and the like. , Can reduce the risk of idle shots.

  Application Example 2 In the liquid consuming device according to the application example, the control unit performs the liquid presence / absence detection to determine that the liquid is present, and the count value is set to a capacity of the liquid container. The reset process is preferably executed when the value is equal to or greater than the corresponding value.

  According to the configuration of this application example, the control unit performs the liquid presence / absence detection, determines that there is liquid, and resets when the updated count value is equal to or larger than the value corresponding to the capacity of the liquid container. Execute the process. If it is determined that there is liquid based on the count value, it is estimated that the liquid has exceeded the capacity of the liquid container, but there is a significant difference between the count value and the actual consumption. It is thought that there is. In such a case, by executing the reset process without the user's operation, there is an erroneous warning that there is no remaining liquid based on the count value despite the actual remaining liquid level. It can be prevented from being emitted repeatedly.

  Application Example 3 The liquid consuming device according to the application example, wherein the control unit includes a sensor end flag that is set when the control unit executes the liquid presence detection and determines that the liquid is not present. The sensor end flag is set, and the count value after the sensor end based on the amount of consumption of the liquid calculated from the last determination that the liquid is present before the sensor end flag is set is Preferably, the reset process is executed when the liquid presence / absence detection is executed and it is determined that the liquid is present.

  According to the configuration of this application example, when the sensor end flag is set, it means that the presence / absence of liquid has already been determined by performing the liquid presence / absence detection by the sensor. If the count value after the sensor end is equal to or greater than the first predetermined value and the presence / absence of the liquid is detected and it is determined that the liquid is present, it is considered that the liquid has been replenished by the user after the sensor end flag is set. It is done. Therefore, when the control unit executes the reset process in such a case, the count value returns to the initial value even when the user does not perform an operation for executing the reset process. Also, if it is determined that there is no liquid and the sensor end flag is set immediately after the sensor end flag is set, if the liquid container (liquid consuming device) is tilted or bubbles are generated in the liquid in the liquid container In some cases, the determination of whether or not there is a liquid may change and confuse the user. Therefore, once it is determined that there is no liquid, a certain amount (first predetermined value) of liquid is consumed and then the liquid presence / absence detection is executed, so that such a change in determination can be avoided.

  Application Example 4 The liquid consumption apparatus according to the application example described above, including a user interface unit including a display unit that displays a message to the user, and the control unit performs the reset process, and A first message is displayed to prompt the user to confirm the amount of the liquid remaining in the liquid container until the presence / absence of the liquid is detected and it is determined that there is no liquid. Generating first data for output to the user interface unit, and the user interface unit displays the first message on the display unit based on the first data output from the control unit It is preferable to do.

  According to the configuration of this application example, after the control unit determines that there is liquid at a predetermined height and returns the count value to the initial value, until the sensor determines that there is no liquid, A first message for prompting confirmation of the remaining amount of liquid is displayed on the user interface unit. Therefore, when a deviation occurs between the count value and the actual liquid consumption, it is possible to prompt the user to visually confirm the remaining amount of liquid. Then, if the liquid is consumed after the count value is returned to the initial value and the sensor determines that there is no liquid, the first message is not displayed, so the mechanism for detecting the presence or absence of the liquid by the sensor is normal. Confirm that it is functioning. Also, even if a failure occurs in the mechanism that detects the presence or absence of a liquid using a sensor, the user can notice the failure by visually checking the remaining amount of liquid.

  Application Example 5 In the liquid consuming device according to the application example, the user interface unit can accept an input from the user to replenish the liquid container, and the control unit After the user interface unit receives an input to replenish the liquid, it is preferable to execute the reset process when it is determined that the liquid is present by performing the liquid presence / absence detection.

  According to the configuration of this application example, when the control unit receives an input indicating that the user interface unit replenishes liquid, the control unit performs liquid presence / absence detection, and performs a reset process when it is determined that there is liquid. Therefore, if the user inputs that the liquid container is refilled from the user interface unit and refills the liquid, the reset process can be executed at any time convenient for the user.

  Application Example 6 The liquid consuming apparatus according to the application example described above, including a display unit that displays a message to the user, and accepting an input from the user to refill the liquid container A user interface unit, and a sensor end flag that is set when the control unit performs the liquid presence detection and determines that the liquid is not present, and the control unit has the sensor end flag set. And the count value after the sensor end based on the amount of consumption of the liquid calculated from the last determination that the liquid is present before the sensor end flag is set is greater than or equal to a first predetermined value, and the presence or absence of the liquid When it is determined that the liquid is not present by performing detection, the count value after the sensor end is a total value of the first predetermined value and the second predetermined value. After the operation of consuming the liquid is stopped, the operation of consuming the liquid is stopped, and then the presence / absence detection of the liquid is performed after the user interface unit receives an input to replenish the liquid. When it is determined that the liquid is present, it is preferable that the reset process is executed and the operation of consuming the liquid is enabled.

  According to the configuration of this application example, when the sensor end flag is set, it means that the liquid presence / absence detection by the sensor has already been executed and it is determined that there is no liquid. If the liquid end detection is performed after the count value after the sensor end becomes equal to or greater than the first predetermined value and it is determined that there is no liquid, the user is in spite of the low remaining amount of liquid. Means that the liquid is not refilled. In such a case, when the difference value is equal to or greater than the total value of the first predetermined value and the second predetermined value, the operation of consuming the liquid is stopped. The total amount of the first predetermined value and the second predetermined value is, for example, the amount of liquid that can be consumed before the empty shot is performed after the liquid presence / absence detection by the sensor is performed and it is determined that there is no liquid. If the value corresponding to is set, the operation of consuming the liquid is stopped when the difference value is equal to or greater than the total value, so that it is possible to suppress the occurrence of empty shot due to the absence of the liquid in the liquid container.

  Further, according to the configuration of this application example, after the operation of consuming the liquid is stopped, the user inputs that the liquid container is to be replenished from the user interface unit, and the liquid is replenished. If it is determined that the liquid is present, the operation of returning the count value to the initial value and consuming the liquid becomes possible. In addition, since the count value returns to the initial value when the liquid is replenished in the liquid container, the deviation between the count value and the actual consumption can be corrected.

  Application Example 7 In the liquid consuming device according to the application example described above, the control unit performs detection of the presence or absence of the liquid when the count value after the sensor end is equal to or greater than the first predetermined value, and the liquid is If it is determined that there is no data, second data for displaying a second message for prompting the user to refill the liquid container with the liquid is generated and output to the user interface unit. And it is preferable that the said user interface part displays the said 2nd message on the said display part based on the said 2nd data output from the said control part.

  According to the configuration of this application example, after the liquid presence / absence detection is performed and it is determined that there is no liquid, until the user performs the liquid presence / absence detection after the liquid is replenished, it is determined that the liquid is present. A second message for prompting the user to refill the liquid container is displayed on the user interface unit. Therefore, it is possible to have the user replenish the liquid before the liquid in the liquid container runs out and the empty shot occurs.

  Application Example 8 In the liquid consumption device according to the application example, the liquid for the user to replenish the liquid container is contained in a replenishment container separate from the liquid consumption device, It is preferable that the volume of the liquid that can be accommodated in the liquid container when the count value after the sensor end becomes equal to or larger than the first predetermined value is equal to or larger than the capacity of the replenishing container.

  According to the configuration of this application example, since the liquid to be replenished is accommodated in the separate replenishing container, the liquid can be easily replenished. Further, when the count value after the sensor end becomes equal to or greater than the first predetermined value, the volume of the liquid that can be accommodated in the liquid container is equal to or greater than the capacity of the replenishing container, so that the liquid is urged to be replenished. If the liquid is replenished when the second message is displayed, the entire amount of the liquid accommodated in the replenishing container can be accommodated without overflowing the liquid container.

  Application Example 9 In the liquid consuming device according to the application example, it is preferable that the control unit performs the liquid presence / absence detection and updates the count value every time a predetermined amount of the liquid is consumed. .

  According to the configuration of this application example, every time a predetermined amount of liquid is consumed, the liquid presence / absence detection is performed and the count value is updated, so that the remaining amount of liquid can be accurately grasped and the remaining amount of liquid is reduced. Can be reliably detected.

  Application Example 10 A liquid consuming apparatus according to the application example, including a plurality of liquid containers individually storing a plurality of liquids of different types, wherein the consumption calculation unit includes the liquid consumption device for each liquid container. The consumption amount of each liquid is calculated, the storage unit stores the count value that is individually updated based on the consumption amount of each liquid for each liquid container, and the sensor is disposed for each liquid container. Preferably, the control unit performs the liquid presence / absence detection before returning the count value to an initial value for each liquid container.

  According to the configuration of this application example, for each of a plurality of liquid containers that individually store different types of liquid, the consumption amount calculation unit calculates the consumption amount, the storage unit stores the count value, and for each liquid container Since the sensor is arranged to detect the presence or absence of liquid for each liquid container, the remaining amount of liquid can be managed individually according to the type of liquid, the capacity of the liquid container, etc., and the risk of empty shots can be suppressed. .

  Application Example 11 In the liquid consuming device according to the application example, the sensor includes a pair of electrodes disposed in the liquid container, and the control unit determines a resistance value between the pair of electrodes. It is preferable to determine whether or not the liquid is present at the predetermined position based on.

  According to the configuration of this application example, the sensor includes a pair of electrodes disposed in the liquid container. Since the resistance value between the pair of electrodes is different between the state in which both of the pair of electrodes are immersed in the liquid and the state in which the pair of electrodes are not immersed in the liquid, is there a liquid at a predetermined position based on the resistance value between the pair of electrodes? It can be determined whether or not.

  Application Example 12 In the liquid consuming device according to the application example, the sensor is disposed in the liquid container and moves according to the amount of the liquid in the liquid container; A light-emitting unit and a light-receiving unit disposed on the control unit, wherein the control unit determines whether the liquid is in the predetermined position based on the intensity of light emitted from the light-emitting unit and received by the light-receiving unit. It is preferable to determine whether or not.

  According to the configuration of this application example, the sensor includes the light shielding member disposed in the liquid container, the light emitting unit and the light receiving unit disposed outside the liquid container, and the light shielding member is an amount of liquid in the liquid container. Move according to. Since the intensity of the light emitted from the light emitting part and received by the light receiving part is different between the case where the light shielding member is located between the light emitting part and the light receiving part, the intensity of the light received by the light receiving part is different. Based on this, it can be determined whether or not there is a liquid at a predetermined position.

1 is a perspective view illustrating a basic configuration of a printer system according to a first embodiment. 1 is a schematic configuration diagram of a printer according to a first embodiment. FIG. 3 is a perspective view illustrating a schematic configuration of an ink supply unit according to the first embodiment. FIG. 2 is a plan view illustrating a schematic configuration of an ink supply unit according to the first embodiment. FIG. 4B is a cross-sectional view taken along line A-A ′ of FIG. 4A. FIG. 3 is an explanatory diagram illustrating a concept of remaining ink management in an ink tank according to the first embodiment. 6 is a flowchart illustrating a method for managing the remaining amount of ink in the printer according to the first embodiment. 6 is a flowchart illustrating a method for managing the remaining amount of ink in the printer according to the first embodiment. 6 is a flowchart illustrating a method for managing the remaining amount of ink in the printer according to the first embodiment. FIG. 6 is a plan view illustrating a schematic configuration of an ink supply unit according to a second embodiment. FIG. 9B is a cross-sectional view taken along line B-B ′ of FIG. 9A. FIG. 9B is a cross-sectional view taken along line D-D ′ of FIG. 9A. FIG. 9B is a cross-sectional view taken along line E-E ′ of FIG. 9A. FIG. 9B is a cross-sectional view taken along line C-C ′ of FIG. 9A. The graph which shows the intensity | strength of the light which an optical sensor detects according to the reduction | decrease in an ink in the ink supply part which concerns on 2nd Embodiment.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, embodiments of the invention will be described with reference to the drawings. The drawings to be used are appropriately enlarged, reduced or exaggerated so that the part to be described can be recognized. In addition, illustrations of components other than those necessary for the description may be omitted.

(First embodiment)
<Basic configuration of printer system>
A basic configuration of a printer system including an ink jet printer (hereinafter simply referred to as a printer) as a liquid consuming apparatus according to the first embodiment will be described with reference to FIG. FIG. 1 is a perspective view illustrating a basic configuration of the printer system according to the first embodiment. The printer system 100 according to the first embodiment is a multifunction machine including a printer 110 as a liquid consuming apparatus and a scanner 120.

  FIG. 1 shows a Y axis, an X axis orthogonal to the Y axis, and a Z axis orthogonal to the X axis and the Y axis. In each of the XYZ axes, the direction of the arrow indicates the + direction (positive direction), and the direction opposite to the direction of the arrow indicates the − direction (negative direction). In the use state, the printer system 100 is arranged on a horizontal plane defined by the X axis and the Y axis, and the + Y direction is the front of the printer system 100. The Z axis is an axis orthogonal to a horizontal plane, and the −Z direction is a vertically downward direction.

  As shown in FIG. 1, the printer system 100 includes a printer 110, a scanner 120, and an ink supply unit 10. The printer system 100 has an operation panel 111 as a user interface unit on the front side.

  On the operation panel 111, for example, buttons for performing operations such as power ON / OFF of the printer system 100, printing by the printer 110, reading of an original by the scanner 120, operation states and messages of the printer system 100, and the like are displayed. A display unit 47 for displaying is arranged. The operation panel 111 is also provided with a reset button for the user to refill the ink tank 11 with ink and execute a reset process. The reset process will be described later.

  The printer 110 can print on a printing medium P such as printing paper by ejecting ink as a liquid. The printer 110 has a case unit 112. The case part 112 constitutes the outer shell of the printer 110. An opening 113 is provided on the front side of the case portion 112. A paper cassette 114 is detachably attached to the case portion 112 in the opening 113. Above the paper cassette 114 (+ Z direction), a paper discharge tray 115 is provided to be extendable in the front-rear direction (+ Y direction and −Y direction).

  As will be described in detail later, the X-axis direction (+ X direction and −X direction) is the main scanning direction HD of the print head of the printer 110, and the Y-axis direction (+ Y direction and −Y direction) is the sub-scanning direction VD of the printer 110. It is. A plurality of print media P are stacked on the paper cassette 114. The print medium P placed on the paper cassette 114 is supplied to the inside of the case unit 112 one by one along the sub-scanning direction VD, printed by the printer 110, and then discharged along the sub-scanning direction VD. The paper is discharged from 116 and placed on a paper discharge tray 115.

  The scanner 120 is placed on the printer 110. The scanner 120 has a case unit 121. The case part 121 constitutes the outer shell of the scanner 120. The scanner 120 is a flat bed type, and includes a document table (not shown) formed of a transparent plate member such as glass, and an image sensor (not shown) such as an image sensor. The scanner 120 can read an image or the like recorded on a medium such as paper as image data via an image sensor.

  The scanner 120 includes an auto document feeder 122 at the upper end. The auto document feeder 122 can sequentially feed and read a plurality of stacked originals (sheets on which images and the like are recorded) one by one. The scanner 120 is configured to be rotatable with respect to the printer 110 and also has a function as a lid of the printer 110. The user can rotate the scanner 120 with respect to the printer 110 by inserting a finger into the handle portion 123 and lifting the scanner 120 upward. Thereby, the scanner 120 can be opened with respect to the printer 110.

  The ink supply unit 10 is disposed on the side of the printer 110 in the + X axis direction. The ink supply unit 10 has a function of supplying ink IK (see FIG. 4B) as a liquid to the printer 110. The ink supply unit 10 includes a case unit 101. A plurality of ink tanks 11 as a plurality of liquid containers are arranged in the case portion 101, and a plurality of different types of ink IK are individually stored in the plurality of ink tanks 11. That is, the plurality of ink tanks 11 contain different types of ink IK for each ink tank 11.

  In this embodiment, there are four ink tanks 11a, 11b, 11c, and 11d. In the present embodiment, four types of inks are used, namely black ink and yellow, magenta, and cyan color inks. The ink tank 11a contains black ink IKa, and the ink tanks 11b, 11c, 11d contain color ink (yellow, magenta, cyan) inks IKb, IKc, IKd (see FIG. 4B). .

  The ink tanks 11 a, 11 b, 11 c, and 11 d are arranged so as to be aligned along the Y-axis direction from the front side of the printer 110, and are fixed in the case unit 101. Hereinafter, when the four ink tanks 11a, 11b, 11c, and 11d and the four types of inks IKa, IKb, IKc, and IKd are not distinguished, they are simply referred to as the ink tank 11 and the ink IK.

  In the present embodiment, each of the four ink tanks 11 is configured to be able to inject ink IK into the ink tank 11 from the outside of the printer system 100. Therefore, the user of the printer system 100 can refill the ink tank 11 with the ink IK stored in another container. The detailed configuration of the ink tank 11 will be described later.

  The case portion 101 is provided with a window portion 102 corresponding to each of the four ink tanks 11. The window part 102 has optical transparency. Therefore, the user can visually recognize the four ink tanks 11 through the window portion 102. The window part 102 may be provided as an opening part formed in the case part 101, and may be comprised with the member which has a light transmittance.

  The portion of each ink tank 11 that faces the window portion 102 has light transmittance. Therefore, the user can visually recognize the amount of ink IK in the four ink tanks 11 through the window portion 102. Each ink tank 11 is provided with an upper limit mark 17 at a portion facing the window portion 102. The upper limit mark 17 indicates the upper limit when the ink IK is replenished as a guide so as not to overflow from the ink tank 11 when the user injects the ink IK. Further, the user can grasp the amount of ink IK in each ink tank 11 using the upper limit mark 17 as a mark.

  In the present embodiment, the capacity of the ink tank 11a is larger than the capacity of the ink tanks 11b, 11c, and 11d. The capacities of the ink tanks 11b, 11c, and 11d are the same. It is assumed that the printer 110 consumes more black ink IKa than the color inks IKb, IKc, and IKd. Therefore, among the four ink tanks 11, the capacity of the ink tank 11a containing the black ink IKa is larger than the capacity of the ink tanks 11b, 11c and 11d containing the color inks IKb, IKc and IKd. . The ink tank 11a containing the black ink IKa is arranged on the front side of the printer 110 so that the user can easily grasp the remaining amount.

  In addition, the arrangement order from the front side of the ink tanks 11b, 11c, and 11d containing the color inks IKb, IKc, and IKd is not particularly limited. Further, when any of the other inks IKb, IKc, and IKd is consumed more than the black ink IKa, the ink IK may be accommodated in the ink tank 11a having a large capacity.

  A lid portion 103 is provided on the upper portion of the case portion 101. The lid portion 103 is rotatably engaged with the case portion 101 via the hinge portion 104. When the lid 103 is opened, the four ink tanks 11 are exposed. For example, when the user injects ink IK into the ink tank 11, the ink tank 11 can be accessed by rotating the lid 103 and opening it upward.

<Printer configuration>
Next, the configuration of the printer according to the first embodiment will be described with reference to FIG. FIG. 2 is a schematic configuration diagram of the printer according to the first embodiment. As shown in FIG. 2, the printer 110 according to the first embodiment includes a carriage 20, a paper feed motor 30, a carriage motor 33, a paper feed roller 34, a control unit 40, and a storage unit 50. ing. In FIG. 2, the scanner 120 is omitted.

  A print head 22 is mounted on the carriage 20. The print head 22 has a plurality of nozzles that eject ink IK on the lower surface side (−Z-axis direction side) of the carriage 20. A tube 18 is provided between the print head 22 and each ink tank 11. Each ink IK in the ink tank 11 is sent to the print head 22 via the tube 18. The print head 22 ejects each ink IK sent from the ink tank 11 as an ink droplet to the print medium P from a plurality of nozzles.

  The carriage 20 is connected to the control unit 40 by a cable (not shown). The carriage 20 reciprocates on the print medium P along the main scanning direction HD by being driven by the carriage motor 33. The paper feed motor 30 rotates the paper feed roller 34 and transports the print medium P in the sub-scanning direction VD. The ejection control of the print head 22 is performed by the control unit 40 via a cable.

  That is, in the printer 110, the control unit 40 controls the paper feed motor 30, the carriage motor 33, and the print head 22, so that the carriage 20 is conveyed in the sub-scanning direction VD while moving along the main scanning direction HD. Printing on the print medium P is performed by ejecting ink IK from the plurality of nozzles of the print head 22 to the print medium P to be printed.

  One end of the carriage 20 in the main scanning direction HD is a home position area in which the carriage 20 stands by. In the home position area, for example, a cap (not shown) for performing maintenance such as cleaning of the nozzles of the print head 22 is disposed. FIG. 2 shows a state where the carriage 20 is located at the home position.

  Further, a waste ink box for receiving waste ink when flushing or cleaning the print head is provided at the other end portion (end portion opposite to the home position) in the main scanning direction HD in the movement region of the carriage 20. (Not shown) are arranged. Note that flushing means that ink IK is ejected from each nozzle of the print head 22 during printing of the print medium P regardless of printing. Cleaning means cleaning the inside of the print head by sucking the print head with a pump or the like provided in the waste ink box without driving the print head.

  An operation panel 111 including a display unit 47 as a user interface unit is connected to the control unit 40. When the user operates the operation panel 111, the printer 110 and the scanner 120 can be operated by the control unit 40.

  For example, in FIG. 1, after setting a document on the auto document feeder 122 of the scanner 120, the user operates the operation panel 111 to start the operation of the printer system 100. Then, the original is read by the scanner 120. Subsequently, based on the read image data of the original, the printing medium P is fed from the paper cassette 114 into the printer 110 (case unit 112), and printing is performed on the printing medium P by the printer 110.

  As shown in FIG. 2, a computer 49 can be connected to the control unit 40 via an interface (I / F) 48. The control unit 40 receives image data from the computer 49 via the interface 48, and controls the printer 110 (print head 22) to print the image on the print medium P. The control unit 40 controls the scanner 120 to read a document and transmit the image data to the computer 49 via the interface 48 or to print the read image.

  The control unit 40 includes a drive control unit 41, a consumption amount calculation unit 42, a liquid level decrease determination unit 43, and an ink remaining amount determination unit 44. The control unit 40 includes a CPU, a ROM, a RAM, and the like (not shown). For example, the control unit 40 operates as each unit of the control unit 40 when the control program stored in the ROM is expanded in the RAM and the CPU executes the control program expanded in the RAM. Alternatively, the control unit 40 may be configured by hardware such as an ASIC (Application Specific IC) that realizes the same function as the function executed by the CPU and the control program, instead of including the CPU. Both may be comprised.

  The drive control unit 41 controls the carriage motor 33 to move the carriage 20. As a result, the carriage motor 33 drives to move the print head 22 included in the carriage 20.

  The consumption calculation unit 42 calculates the ink consumption consumed by ejecting the ink IK from each nozzle of the print head 22. The consumption calculation unit 42 starts calculating the ink consumption based on the state (initial value) where each ink tank 11 is filled with the ink IK. More specifically, when the user refills the ink tank 11 with the ink IK and presses the reset button, the ink consumption count value for the ink tank 11 is initialized (reset to the initial value). In the example, the initial value is a count value indicating 0 g of ink consumption), and the integration of ink consumption is started. Then, the ink consumption is continuously accumulated for the ink tank 11 until the count end described later is reached or the user presses the reset button again.

  In the printer 110 according to the present embodiment, when the ink remaining amount is displayed on the monitor of the computer 49, the amount of ink IK consumed by the printer 110 is calculated with respect to the ink weight of one refill bottle provided by the printer vendor. To do. That is, the weight of one refill bottle (the ink amount corresponding to the sum of the predetermined amount C1, the predetermined amount C2, and the predetermined amount C3 shown in FIG. 5 described later (= the predetermined amount C2, the predetermined amount C3, and the predetermined amount C4). The ratio of the ink consumption weight based on the most recent ink consumption count value) to the total ink amount) is displayed.

  The ink consumption amount calculated by the consumption amount calculation unit 42 is not only the ink consumption amount by printing on the print medium P but also the ink consumption amount used for the maintenance of the print head by cleaning the nozzles of the print head 22 or flushing. Including. The ink consumption is a count value by a so-called dot count method. That is, the integrated ink consumption is calculated by integrating the design ink consumption consumed for each dot by the number of dots required by the image data to be printed based on the image data to be printed. . In this embodiment, the amount of each ink IK ejected from the nozzles of the print head 22 (the amount of ink IK per dot × the number of ejected dots) is calculated for each pass in which the carriage 20 performs one scan. .

  Further, the amount of ink consumed when performing cleaning or flushing is calculated as the amount of ink IK used each time it is performed once. As the ink consumption count value, the used ink consumption amount is added every time a predetermined amount (unit consumption amount) of ink IK is consumed or discharged every time during printing. Is remembered. Further, at the time of cleaning or flushing, the latest consumption count 51 is stored each time.

  A state where the count value of the ink consumption has reached a predetermined limit value is referred to as “count end”. As will be described in detail later, the predetermined limit value is a count value of the ink consumption corresponding to the maximum consumable capacity of the ink tank 11. When the count value of the ink consumption reaches a predetermined limit value, the control unit 40 sets the count end flag 54 in the storage unit 50.

  Although illustration is omitted, in the printer 110, for example, when the user performs an operation to execute printing, the computer 49 calculates a rough indication of the remaining amount of ink IK in each ink tank 11 based on the count value of the ink consumption. Can be displayed on the monitor (screen). Therefore, the user can not only visually recognize the remaining amount of the ink IK in each ink tank 11 through the window 102 of the ink tank 11 but also grasp it as a guide by the monitor of the computer 49.

  In addition, an indication of the remaining amount of ink in the ink tank 11 based on the count value is output to the computer 49 or an external terminal outside the printer system 100 by wired or wireless communication, and the remaining amount of ink is displayed on the computer 49 or the monitor of the external terminal. By displaying a guide, the remote user can recognize the remaining amount. In addition to the above, an indication of the ink remaining amount in the ink tank 11 based on the count value may be displayed on the display unit 47 of the operation panel 111 of the printer 110.

  The liquid level lowering determination unit 43 performs ink presence / absence detection for each ink tank 11 to determine whether the ink IK is present at a predetermined position in the ink tank 11, that is, at a predetermined height from the bottom. In the ink tank 11, a sensor 19 to be described later is disposed for each ink tank 11 (see FIG. 4B). The sensor 19 includes a pair of electrodes 15 and 16. In the ink presence / absence detection, the liquid level lowering determination unit 43 applies a voltage to the pair of electrodes 15 and 16 and determines whether or not the ink IK is present at a predetermined height in each ink tank 11 based on the output signal. To do.

  As a result of the detection of the presence or absence of ink by the liquid level lowering determination unit 43, a state in which it is determined that there is no ink IK at a predetermined height in the ink tank 11 based on the output signals from the pair of electrodes 15 and 16 is “sensor "End". The control unit 40 sets a sensor end flag 55 in the storage unit 50 for the ink tank 11 determined to be a sensor end.

  Once the sensor end flag 55 is set, the consumption calculation unit 42 starts calculating the ink consumption after the sensor end for the ink tank 11 determined to be the sensor end. The count value of the ink consumption after the sensor end is updated every time a predetermined amount (unit consumption) of ink IK is consumed, and is stored in the storage unit 50 as a post-detection consumption count 52.

  The count value of the ink consumption after the sensor end is calculated from the latest consumption count value when the liquid level lowering determination unit 43 finally determines that the ink IK is at a predetermined height before determining the sensor end. The Therefore, it is possible to reduce a risk that the actual consumption amount of the ink IK consumed after the sensor end becomes larger than the count value stored as the post-detection consumption amount count 52. Accordingly, it is possible to suppress the risk that the ink remaining amount determination unit 44, which will be described later, will cause an empty shot before determining the ink end based on the count value of the ink consumption after the sensor end.

  Instead of calculating the ink consumption after the sensor end, the count value when it is finally determined that the ink IK is at a predetermined height before determining the sensor end is stored as the detection consumption count. Alternatively, the difference value between the detected consumption count and the latest consumption count 51 may be used as the ink consumption after the sensor end.

  The presence / absence detection of ink by the liquid level lowering determination unit 43 is repeatedly executed at a predetermined timing such as when the printer 110 (printer system 100) is turned on, when a print job is received, or before reset processing described later is executed. The The ink presence / absence detection is executed every time the unit consumption amount of ink IK is consumed during printing.

  However, the liquid level lowering determination unit 43 determines that the ink consumption amount after the sensor end is equal to or greater than a predetermined value A, which will be described later, with respect to the ink tank 11 that has once determined the sensor end and has set the sensor end flag 55. Does not perform ink presence / absence detection. This is because, for example, after it is determined that there is no ink IK at a predetermined height because the liquid level fluctuates due to the inclination of the printer 110 (printer system 100) or bubbles are generated in the ink IK, This is because it may be determined that the ink IK is present at a predetermined height in the next ink presence / absence detection, and in such a case, the user is not confused.

  The ink remaining amount determination unit 44 is arranged in each ink tank 11 based on the count value of the ink consumption after the sensor end stored in the post-detection consumption amount count 52 and the determination information set for each ink tank 11. The remaining state of the ink IK is determined.

  As the determination of the remaining state of the ink IK, “ink low” indicating a state in which the amount of ink IK in the ink tank 11 is low and “ink end” indicating a state in which the consumable amount of the ink IK in the ink tank 11 is exhausted. There is. The determination of the remaining state of the ink IK is performed based on the determination information 53 stored in the storage unit 50. The determination information 53 is a predetermined value set for each ink tank 11 as a first predetermined value A for determining ink low, and a second predetermined value for determining ink end. And a predetermined value B.

  The ink remaining amount determination unit 44 determines that the ink consumption count value after the sensor end of the ink tank 11 is a predetermined value A after the liquid level decrease determination unit 43 determines that any of the ink tanks 11 is at the sensor end. When it is above, it is determined that the ink is low.

  Data for displaying an “ink low notification” (second message) for the ink tank 11 that has been determined to be in-crown, informing the user of a decrease in the remaining amount of ink IK and prompting the user to replenish ink IK. (Second data) is generated and output to the display unit 47. The display unit 47 displays an ink low notification based on the data. The message for prompting the replenishment of the ink IK continues until the ink end flag 56 described later is set and until the count value is returned to the initial value after the reset process is executed. Is displayed.

  When the ink consumption count value of the ink tank 11 after determining that the ink is low becomes equal to or greater than the predetermined value B, that is, the count value of the ink consumption after the sensor end is the predetermined value A. And the predetermined value B, the ink end is determined. The control unit 40 sets the ink end flag 56 in the storage unit 50 for the ink tank 11 determined to be ink end.

  When the ink end flag 56 is set, the control unit 40 stops the printing operation of the printer 110 in order to avoid an idle driving state in which the ink IK to be ejected is lost. Then, the control unit 40 generates and displays data for displaying an “ink end notification” that notifies the ink tank 11 determined to be the ink end that the ink IK has run out and prompts the ink IK to be replenished. The display unit 47 displays an ink end notification based on the data.

  Once the ink end flag 56 is set and the printing operation is stopped, the printer 110 operates until the resetting process is executed by the user pressing the reset button and the determination by the liquid level lowering determination unit 43 is that there is ink IK. do not do. After the ink end flag 56 is set and the printing operation is stopped, the user refills the ink tank 11 determined to be the ink end, presses the reset button, and the control unit 40 supplies the ink IK via the operation panel 111. When an input to the effect of replenishment is received, the presence / absence detection of ink by the liquid level lowering determination unit 43 is executed. When it is determined that the ink IK is present at the predetermined height, the reset process is executed, and the printer 110 is ready for a printing operation.

  The storage unit 50 stores information in a nonvolatile manner and rewritable. The storage unit 50 is configured by a nonvolatile memory such as an EEPROM (Electrically Erasable Programmable Read-Only Memory), for example. The ROM included in the control unit 40 may be configured to also function as the storage unit 50. The storage unit 50 has an area in which the latest consumption count 51, the post-detection consumption count 52, and the determination information 53 are stored. Further, the storage unit 50 has an area in which a count end flag 54, a sensor end flag 55, and an ink end flag 56 are set.

  As described above, the count value of the latest consumption count 51 is appropriately updated based on the ink consumption calculated by the consumption calculation unit 42 for each ink tank 11. When the user refills the ink tank 11 with the ink IK and presses the reset button, the latest consumption count 51 stored in the ink tank 11 is cleared and returned to the initial value. The reset process is a process in which the count value of the latest consumption count 51 is set as an initial value.

  The post-detection consumption count 52 is appropriately updated for the ink tank 11 determined to be a sensor end based on the calculation of the ink consumption by the consumption calculation unit 42. When the user refills the ink tank 11 with the ink IK and presses the reset button, the reset process is executed, and when the liquid level lowering determination unit 43 determines that the ink IK is present, the ink tank 11 is stored. The post-detection consumption count 52 thus cleared is returned to the initial value.

  The determination information 53 is information for the ink remaining amount determination unit 44 to determine ink low and ink end for each ink tank 11 and includes the predetermined value A and the predetermined value B described above. The predetermined value A and the predetermined value B are values set for each ink tank 11, that is, for each type of ink IK.

  The reset process is a process for replenishing the ink tank 11 determined to be ink low or ink end and initializing the ink consumption count value (returning to the initial value). The reset process is executed when the user presses the reset button on the operation panel 111. When the reset process is executed by the user's manual operation and the liquid level lowering determination unit 43 executes the ink presence / absence detection and it is confirmed that the ink IK is present, the count end flag 54, the sensor end flag 55, and the ink end flag For 56 of which the flag is set, the flag is canceled, the count values stored in the latest consumption count 51 and the detected consumption count 52 are returned to the initial values, and the calculation of the ink consumption is started. Is done.

  It should be noted that the reset process by the user's manual operation is performed by pressing the reset button regardless of whether the ink IK remaining amount (consumption amount), the count end flag 54, the sensor end flag 55, and the ink end flag 56 are set. It can be executed at any time by pressing.

  In the present embodiment, in consideration of a case where the user forgets to press the reset button despite the user refilling the ink tank 11 with ink IK, under certain conditions even when the user does not press the reset button, An “automatic reset process” is executed to cancel the count end flag 54 and return the count values stored in the latest consumption count 51 and the detected consumption count 52 to the initial values. The automatic reset process will be described later.

<Configuration of ink supply unit>
Next, the configuration of the ink supply unit according to the first embodiment will be described with reference to FIGS. 3, 4A, and 4B. FIG. 3 is a perspective view illustrating a schematic configuration of the ink supply unit according to the first embodiment. FIG. 4A is a plan view illustrating a schematic configuration of the ink supply unit according to the first embodiment. 4B is a cross-sectional view taken along line AA ′ of FIG. 4A. 3, 4 </ b> A, and 4 </ b> B show a state in which the case portion 101 is removed from the ink supply unit 10 shown in FIG. 1.

  3, 4A, and 4B, the ink supply unit 10 includes four ink tanks 11a, 11b, 11c, and 11d, a holding unit 13, a detection substrate 14, and a sensor 19 (a pair of electrodes 15). 16).

  As shown in FIG. 3, the ink tanks 11a, 11b, 11c, and 11d are arranged in a line along the Y-axis direction. The ink tank 11 is made of a synthetic resin such as nylon or polypropylene, for example. Each of the four ink tanks 11 may be configured separately or may be configured integrally. When the ink tank 11 is integrally formed, the ink tank 11 may be formed integrally, or four ink tanks 11 formed separately may be bundled or connected together.

  In the present embodiment, the upper surface of the front (+ X direction) side portion of the ink tank 11 is lower than the upper surface of the rear (−X direction) side portion. An inlet 12 for injecting ink IK from the outside of the printer 110 is provided on the upper surface of the front side portion of the ink tank 11. When the user injects the ink IK from the injection port 12, the ink tank 11 can be supplemented with the ink IK of each color. Although not shown, the ink IK for the user to refill the ink tank 11 is provided in a separate refill container (hereinafter referred to as a refill bottle).

  In the ink tank 11, the Z-axis direction, the Y-axis direction, and the X-axis direction are also referred to as a height direction, a width direction, and a depth direction, respectively. As described above, the capacity of the ink tank 11a that contains the black ink IKa is larger than the capacity of the ink tanks 11b, 11c, and 11d that contain the color inks IKb, IKc, and IKd. When the ink tank 11a and the ink tanks 11b, 11c, and 11d are compared, the height and depth are the same and the width is different. That is, the width (length in the Y-axis direction) of the ink tank 11a is larger than the width of the ink tanks 11b, 11c, and 11d.

  Note that the capacity of the refill bottle in which the ink IK to be refilled by the user varies depending on the type of the ink IK. In other words, the capacity of the refill bottle differs depending on the capacity of the ink tank 11 in which each ink IK is accommodated. In this embodiment, the capacities of the ink tanks 11b, 11c, and 11d in which the color inks IKb, IKc, and IKd are stored are the same. Therefore, the capacities of the refill bottles in which the replenishing color inks IKb, IKc, and IKd are stored. Are the same as each other. On the other hand, since the capacity of the ink tank 11a that contains the black ink IKa is larger than the capacity of the ink tanks 11b, 11c, and 11d, the capacity of the refill bottle that contains the black ink IKa for replenishment is the color ink for replenishment. It is larger than the capacity of the refill bottle that accommodates IKb, IKc, and IKd.

  A holding portion 13 extending along the Y-axis direction in which the ink tanks 11a, 11b, 11c, and 11d are arranged is disposed above the portion on the rear side of the ink tank 11. The holding unit 13 is fixed to the four ink tanks 11 with screws or the like, for example. The holding unit 13 has a function of holding the detection substrate 14 disposed above the holding unit 13. The holding part 13 is made of, for example, an insulating synthetic resin. On the holding unit 13, a detection substrate 14 extending along the Y-axis direction in which the ink tanks 11a, 11b, 11c, and 11d are arranged is disposed. The detection substrate 14 is held by the holding unit 13.

  As shown in FIG. 4A and FIG. 4B, sensors 19 (a pair of electrodes 15 and 16) for detecting the presence or absence of ink are electrically connected to the detection substrate 14 corresponding to each ink tank 11. . The pair of electrodes 15 and 16 are connected to the detection substrate 14 via, for example, a spring-like connector (not shown). A total of four pairs of electrodes 15 and 16 corresponding to the four ink tanks 11 are arranged along the extending direction of the detection substrate 14. The detection substrate 14 is connected to the control unit 40 by an FFC (Flexible Flat Cable) not shown. Thereby, the output of the sensor is input to the liquid level lowering determination unit 43 of the control unit 40.

  As shown in FIG. 4B, the pair of electrodes 15 and 16 constituting the sensor 19 are arranged inside each ink tank 11. The pair of electrodes 15 and 16 have a longitudinal direction, and are arranged so that the longitudinal direction is along the height direction (Z-axis direction) of the ink tank 11 from the detection substrate 14 downward (−Z direction). . The pair of electrodes 15 and 16 are made of a metal material such as stainless steel, for example.

  One electrode 15 of the pair of electrodes has a length that allows the lower end portion to reach a position near the bottom of the ink tank 11. The other electrode 16 of the pair of electrodes is shorter than the electrode 15, and has a length that allows the lower end portion to reach a predetermined height from the bottom of the ink tank 11. The predetermined height from the bottom where the tip of the electrode 16 is located is set to the same height for the four ink tanks 11. The predetermined height is appropriately set based on, for example, the capacity of the ink tanks 11a, 11b, 11c, and 11d, the consumption amount of each ink IK during a predetermined period, and the like.

  The pair of electrodes 15 and 16 has a function of detecting whether or not the ink IK is present at a predetermined height in each ink tank 11. When detecting the presence or absence of ink, a voltage is applied between the pair of electrodes 15 and 16 from the control unit 40 (see FIG. 2) via the detection substrate 14. The voltage applied between the pair of electrodes 15 and 16 is preferably an AC voltage from the viewpoint of suppressing the precipitation of the ink IK.

  The detection board 14 is provided with an analog switch (not shown) for switching the ink tank 11 to which a voltage is applied. When the liquid level lowering determination unit 43 (see FIG. 2) executes ink presence / absence detection, the ink tank 11 to be determined is selected by switching the analog switch. A voltage is applied between the pair of electrodes 15 and 16 with respect to the selected ink tank 11.

  Focusing on the ink tank 11b in FIG. 4B, the height of the liquid level of the ink IKb accommodated in the ink tank 11b is equal to or higher than a predetermined height. That is, in the ink tank 11b, both the pair of electrodes 15 and 16 are immersed in the ink IKb. Therefore, when ink presence / absence detection is executed for the ink tank 11b, a current corresponding to the resistance between the pair of electrodes 15 and 16 flows due to the applied voltage. If it does so, the signal based on the resistance value between a pair of electrodes 15 and 16 arrange | positioned at the ink tank 11b will be output to the control part 40 via the detection circuit provided in the detection board | substrate 14. FIG. When the ink IK is not present, the resistance value between the pair of electrodes 15 and 16 is infinite, and when the ink IK is present, the resistance value is in accordance with the ink IK.

  As a result, the liquid level lowering determination unit 43 determines that the ink IKb is present at a predetermined height with respect to the ink tank 11b. Similarly, for the ink tank 11d in which the liquid level of the stored ink IKd is equal to or higher than a predetermined height, when ink presence / absence detection is performed, the ink IKd is passed between the pair of electrodes 15 and 16 by the applied voltage. Since the current flows, the liquid level lowering determination unit 43 determines that the ink IKd is present at a predetermined height.

  On the other hand, when paying attention to the ink tank 11a, the height of the liquid level of the ink IKa accommodated in the ink tank 11a is lower than a predetermined height. That is, in the ink tank 11a, the electrode 16 is not immersed in the ink IKa. Therefore, when ink presence / absence detection is performed on the ink tank 11a, no current flows between the pair of electrodes 15 and 16 even when a voltage is applied.

  As a result, the liquid level lowering determination unit 43 determines that the ink tank 11a is “sensor end” with no ink IKa at a predetermined height. Similarly, with respect to the ink tank 11c in which the liquid level of the stored ink IKc is lower than a predetermined height, a current flows between the pair of electrodes 15 and 16 even if a voltage is applied when ink presence / absence detection is executed. Therefore, the liquid level lowering determination unit 43 determines that the sensor end has no ink IKc at a predetermined height.

  As described above, in this embodiment, the ink IK is present at a predetermined height from the bottom of the ink tank 11 based on the presence / absence of energization between the pair of electrodes 15 and 16 constituting the sensor 19 (difference in resistance value). It is possible to detect whether or not. The liquid level lowering determination unit 43 repeatedly determines whether or not the ink IK is present at a predetermined height from the bottom of each ink tank 11 at the predetermined timing described above.

  When the printer 110 repeats printing to consume the ink IK, and the liquid level lowering determination unit 43 makes the determination, the liquid level of the ink IK in any one of the ink tanks 11 is lower than a predetermined height. Then, the ink tank 11 is determined as a “sensor end” in which there is no ink IK at a predetermined height.

  After the liquid level lowering determination unit 43 determines that the “sensor end” has no ink IK at a predetermined height, the ink IK is consumed, the liquid level further decreases, and the ink tank 11 moves to the print head 22 (see FIG. 2). When the ink IK to be sent is exhausted, an idle driving state occurs. In this embodiment, in order to avoid the idling state, the remaining amount management of the ink IK in the ink tank 11 is performed as described below.

<Concept of remaining ink management>
The concept of ink IK remaining amount management according to the first embodiment will be described with reference to FIG. FIG. 5 is an explanatory diagram showing the concept of ink remaining amount management in the ink tank according to the first embodiment. FIG. 5 schematically shows the remaining levels L0 to L5 of the ink IK in the ink tank 11. In FIG. 5, the vertical direction corresponds to the magnitude of the capacity, and the remaining amount of ink IK increases as it goes upward from the remaining amount level L0 to the remaining amount level L5 with the lower side as the bottom side.

  The remaining amount level L0 is the lowest level of the remaining amount of ink IK, and is a reference level for the maximum consumable capacity of the ink tank 11. At the remaining amount level L0, it is determined that there is no ink IK in the ink tank 11, and the ink end flag 56 is set. Then, an ink end notification is displayed to the user, and the printing operation of the printer 110 (see FIG. 2) stops.

  Even when the remaining amount level L0 is reached, the ink IK of a predetermined amount C0 necessary for preventing the idling is left in the ink tank 11 in order to avoid the idling state. Ink IK is also left in the flow path between the ink tank 11 and the print head 22 (see FIG. 2). Therefore, the user can operate the printer 110 and consume the ink IK without causing idling until the ink IK in the ink tank 11 reaches the remaining amount level L0.

  The remaining amount level L1 corresponds to a remaining state in which a predetermined amount C1 of ink IK is left until reaching the remaining amount level L0. The predetermined amount C1 corresponds to a predetermined value B of the count value. That is, the difference value between the count value when the remaining amount level L1 is reached and the count value when the remaining amount level L1 is reached by consuming a predetermined amount C1 of ink IK from the remaining amount level L1 is a predetermined value B. It is. At the remaining amount level L1, it is determined that the ink IK in the ink tank 11 is low “ink low”, and an ink low notification for prompting the user to replenish the ink IK is displayed.

  It is necessary for the user to replenish the ink IK from the remaining amount level L1 to the time when the predetermined amount C1 of ink IK is consumed and the remaining amount level L0 is reached. Although it is desirable that the refilling ink IK be prepared at the user's hand, it may be out of stock. Therefore, assuming a predetermined lead time (for example, one week) for the user to arrange the refilling ink IK after the ink low notification is displayed, the consumption amount for each ink IK consumed in that period is estimated. The predetermined amount is C1 (predetermined value B). Note that the lead time may be set by the printer vendor based on the total result of the usage state of the printer 110 by the printer user.

  The remaining amount level L2 is a level corresponding to a predetermined height at which the presence / absence of ink is detected to determine “sensor end” and the sensor end flag 55 is set. The remaining amount level L2 corresponds to a remaining state in which a predetermined amount C2 of ink IK is left until the remaining amount level L1 is reached. The predetermined amount C2 corresponds to the predetermined value A of the count value. That is, the difference value between the count value when the remaining amount level L2 is reached and the count value when the predetermined amount C2 of ink IK is consumed from the remaining amount level L2 and the remaining amount level L1 is reached is a predetermined value A. It is.

  As described above, after it is determined that there is no ink IK at a predetermined height in the presence / absence detection of ink, it may be determined that the ink IK is present at a predetermined height in the next detection of ink presence / absence. In such a case, in order not to confuse the user, after the sensor end is determined at the remaining amount level L2, the ink presence / absence detection is performed until the predetermined amount C2 (predetermined value A) of ink IK is consumed and the remaining amount level L1 is reached. To stop. The predetermined amount C2 is preferably smaller than the predetermined amount C0 for preventing idling.

  The remaining amount level L3 is the remaining state when the user replenishes the ink tank 11 with the entire amount of ink IK stored in the refill bottle when the remaining amount level L0 is reached, that is, when the ink end notification is displayed. Equivalent to. Therefore, if the amount of ink IK that can be consumed from the remaining amount level L3 to the remaining amount level L2 that is the sensor end is the predetermined amount C3, the total of the predetermined amount C1, the predetermined amount C2, and the predetermined amount C3 is accommodated in the refill bottle. Equal to the total amount of ink IK to be applied.

  The remaining amount level L4 corresponds to the remaining state when the ink tank 11 is replenished with the entire amount of ink IK stored in the refill bottle when the remaining amount level L1 is reached, that is, when the ink low notification is displayed. To do. Accordingly, if the amount of ink IK from the remaining amount level L4 to the remaining amount level L3 is a predetermined amount C4, the predetermined amount C4 is equal to the predetermined amount C1, and the total of the predetermined amount C2, the predetermined amount C3, and the predetermined amount C4. Is equal to the total amount of ink IK contained in the refill bottle.

  The remaining amount level L5 corresponds to the upper limit level of the remaining amount of ink IK. At the remaining amount level L5, the ink IK does not overflow from the ink tank 11 when the user replenishes the ink tank 11 with the entire amount of ink IK accommodated in the refill bottle at the remaining amount level L1 with respect to the remaining amount level L4. A predetermined amount C5 is added as a margin for the purpose.

  As described above, ink low determination and notification are performed based on a comparison between the count value of the ink consumption after the sensor end and the predetermined value A. Here, the ink consumption efficiency of the printer 110 has a tolerance due to individual differences of the printer 110. In a printer with good ink consumption efficiency, the amount of ink IK actually ejected and consumed from the print head 22 is smaller than the count value based on the image data to be printed, and the ink level is reduced from the remaining level L2 as the sensor end. The amount of ink IK consumed until the notification is received is smaller than the predetermined amount C2 (predetermined value A).

  When the actual consumption amount of the ink IK is smaller than the count value, when the user replenishes the ink tank 11 with the entire amount of the ink IK stored in the refill bottle when the ink low notification is displayed, the ink IK is remaining. It becomes more (higher) than level L4. In such a case, it is possible to prevent the ink IK from overflowing from the ink tank 11 because the capacity of the ink tank 11 has a margin of a predetermined amount C5. The predetermined amount C5 is preferably larger than the predetermined amount C2, and is preferably smaller than the predetermined amount C0.

  According to such a configuration, the capacity of the ink tank 11 is larger than the capacity of the refill bottle by the sum of the predetermined amount C4 (or the predetermined amount C1) and the predetermined amount C5. Therefore, the user consumes at least the total amount of the ink IK of the predetermined amount C1, the predetermined amount C2, and the predetermined amount C3 from the state where the ink tank 11 is replenished with the entire amount of the ink IK stored in the refill bottle. Is possible.

  Further, from the remaining amount level L5, that is, from the state in which the ink IK is filled in the ink tank 11, the user sums the predetermined amount C1, the predetermined amount C2, the predetermined amount C3, the predetermined amount C4, and the predetermined amount C5. Ink IK can be consumed. Therefore, the total sum of the predetermined amount C1, the predetermined amount C2, the predetermined amount C3, the predetermined amount C4, and the predetermined amount C5 is the maximum consumable capacity of the ink tank 11.

  When the user performs printing and consumes ink IK, the remaining amount level of ink IK is the remaining amount level L1 at which the ink low notification is displayed, and then the remaining amount level at which the ink end notification is displayed and the printing operation stops. It is desirable for the user to replenish the ink tank 11 with the entire amount of ink IK accommodated in the refill bottle before reaching L0. It is preferable that the user executes the reset process every time the ink tank 11 is replenished with all the ink IK of the refill bottle.

  If the user refills the ink tank 11 with the ink IK and executes the reset process as described above, there is no significant difference between the ink IK consumption based on the count value and the actual ink IK consumption. The standard of the remaining amount of ink IK displayed on a monitor such as the computer 49 (see FIG. 2) corresponds to the actual remaining amount of ink IK.

  However, there are various usage methods by the user. For example, a small amount of ink IK may be repeatedly replenished before the ink low notification is displayed, or the ink IK may be replenished when the ink low notification is displayed. There may be a case where the reset process is not executed (or the execution of the reset process is forgotten). In this case, a deviation occurs between the consumption amount of the ink IK based on the count value and the actual consumption amount of the ink IK.

  The ink remaining amount display is based on the case where one refill bottle is replenished at the remaining amount level L0, “every time for the count value corresponding to the sum of the predetermined amount C1, the predetermined amount C2, and the predetermined amount C3. It is displayed based on the value of the ratio of “updated count value (most recent consumption count value)”. However, after this latest consumption count value reaches the count value corresponding to the predetermined amount C3 from L3, until the sensor end flag 55 is set, “the predetermined amount C1, the predetermined amount C2, the predetermined amount C3, Is fixedly displayed based on the ratio value of the count value corresponding to the predetermined amount C3 with respect to the count value corresponding to the sum of the two. In this way, ink low or ink end is not displayed even though there is actually an ink of L2 or more.

  Here, the user can replenish ink IK as in the present embodiment, and is not equipped with a sensor for detecting the presence or absence of ink unlike the printer described in Patent Document 1, and the count from when the count is started. Assume a printer configured to determine ink low and ink end based on values. In such a printer, when the difference between the ink consumption based on the count value corresponding to the most recent consumption count and the actual ink consumption increases, the remaining amount of ink estimated based on the count value and the actual ink consumption Therefore, it becomes difficult to accurately determine ink low and ink end.

  Therefore, if the remaining amount estimated based on the count value is less than the actual remaining amount, an ink low or ink end is erroneously warned based on the count value even though there is ink in the ink tank, and the user is It will be bothered. On the other hand, if the remaining amount estimated based on the count value is larger than the actual remaining amount, the ink end is not warned even though there is no ink in the ink tank, and an idle state is generated. Become.

  In the present embodiment, ink presence / absence detection is performed by the sensor (the pair of electrodes 15 and 16), and when the ink IK is exhausted at a predetermined height in the ink tank 11, the sensor end is determined. When the count value of the consumption amount of the ink IK after determining the sensor end is equal to or greater than the predetermined value A, it is determined that the ink is low, and when the count value after determining the ink low is equal to or greater than the predetermined value B, It is determined that the end.

  For example, even if the user repeatedly adds and replenishes a small amount of ink IK and the difference between the consumption amount of ink IK based on the count value and the actual consumption amount of ink IK increases, The ink low and the ink end are determined based on the difference value of the count value with the determined time as a reference. Therefore, in the present embodiment, the ink low and the ink end can be determined more accurately, so that it is possible to suppress the occurrence of the idling state.

  However, if there is a large difference between the ink IK consumption based on the count value and the actual ink IK consumption, an indication of the remaining amount of ink IK displayed on the monitor of the computer 49 based on the count value is This is different from the actual remaining amount of ink IK. In the unlikely event that a mechanism that detects the presence / absence of ink using a sensor fails and the sensor end cannot be determined, there is a possibility of causing an idle driving state.

  Therefore, in the present embodiment, the count value of the ink consumption amount from the remaining amount level L5 to the remaining amount level L0 corresponding to the maximum consumable capacity of the ink tank 11 is set as a predetermined limit value, and the count value becomes the predetermined limit value. The reached state is the count end. The amount of ink IK that can be consumed by the user on the count is maximum until the count value reaches a predetermined limit value corresponding to the maximum consumable capacity of the ink tank 11 after the count is started at the remaining amount level L5. Accordingly, when the count value exceeds a predetermined limit value, there is a difference between the consumption amount (remaining amount) of the ink IK based on the count value and the actual consumption amount (remaining amount) of the ink IK. Judge.

  When the count value reaches a predetermined limit value and the count end is reached, the count end flag 54 is set. When the count end flag 54 is set, the control unit 40 (see FIG. 2) visually checks the remaining amount of ink IK in the ink tank 11 with respect to the ink tank 11 for which the count end flag 54 is set. The data (first data) for displaying the “periodic notification” (first message) that prompts the user to generate is generated and output to the display unit 47 (see FIG. 2). Display notifications periodically based on.

  As a result, when the estimated ink IK remaining amount displayed on the monitor of the computer 49 is different from the actual ink IK remaining amount based on the count value, the user visually confirms the ink IK remaining amount. By doing so, the user can be aware that the remaining amount of ink IK displayed on the monitor is different from the actual amount. Also, in the unlikely event that a failure occurs in the mechanism that detects the presence or absence of ink using a sensor, the user can recognize that the failure has occurred by visually checking the remaining amount of ink IK.

  In this embodiment, as shown in FIG. 4B, the capacity of the ink tank 11a that contains the black ink IKa is larger than the capacity of the ink tanks 11b, 11c, and 11d. Therefore, the predetermined amounts C1, C2, C3, C4 and C5 and the predetermined values A and B for the ink tank 11a are based on the predetermined amounts C1, C2, C3, C4 and C5 and the predetermined values A and B for the ink tanks 11b, 11c and 11d. However, the relative relationship between the capacity of each ink tank 11 and the capacity of the refill bottle corresponding thereto is the same as described above.

  Further, even when the predetermined values A and B for the ink tank 11a are different from the predetermined values A and B for the ink tanks 11b, 11c, and 11d, the presence or absence of ink is detected by the sensor 19 (the pair of electrodes 15 and 16). The predetermined heights from the bottom of the ink tanks 11a, 11b, 11c, and 11d are set to be the same. Thereby, the sensor 19 (a pair of electrodes 15 and 16) can be used in common by the ink tanks 11a and the ink tanks 11b, 11c, and 11d having different capacities, and the detection substrate 14 can also be easily arranged. .

<Ink remaining amount management method>
Next, a method for managing the remaining amount of ink in the printer according to the first embodiment will be described with reference to FIGS. 6, 7, and 8. 6, 7, and 8 are flowcharts illustrating the ink remaining amount management method in the printer according to the first embodiment. In the following description, the units included in the control unit 40 of the printer 110 are collectively referred to simply as the control unit 40.

  In this embodiment, the processing of each step in the flowcharts shown in FIGS. 6, 7, and 8 is performed when the printer 110 is turned on, when a print job is received from the user, and when the latest consumption count is counted. This is executed for each unit consumption of ink IK based on the value (each time the difference value between the current count value and the previous count value becomes the unit consumption), for example, at the time of cleaning.

  Each step can be executed in any order or in parallel as long as there is no contradiction in processing contents. Further, the message for prompting the user to select is not limited to the message of the present embodiment as long as it does not hinder the control unit 40 from proceeding to the next step.

  Then, the control unit 40 (see FIG. 2) sequentially selects the target ink tank 11 from the ink tanks 11a, 11b, 11c, and 11d (see FIG. 4B), and the processing of each step is performed on the selected ink tank 11. Execute. Then, the process of each step is executed for all of the ink tanks 11 provided in the printer 110.

  As described above, after the reset process is performed, the control unit 40 sets the ink consumption count, which is a ratio of the ink consumption based on the capacity of one refill bottle, as an initial value (ink consumption 100%). The amount is calculated, and the latest consumption count 51 calculated for each ink tank 11 is stored in the storage unit 50 (see FIG. 2). Further, the control unit 40 calculates the ink tank 11 determined to be the sensor end from the count value when it is finally determined that the ink IK is at a predetermined height before determining the sensor end, and after the sensor end. The ink consumption is calculated, and the post-detection consumption count 52 calculated for the ink tank 11 is stored in the storage unit 50. The predetermined value A and the predetermined value B for each ink tank 11 are stored in the storage unit 50 as determination information 53.

  First, in step S01 shown in FIG. 6, the control unit 40 determines whether or not the ink end flag 56 is set in the storage unit 50. If it is determined that the ink end flag 56 is not set (step S01: NO), the control unit 40 advances the process to step S02.

  On the other hand, if it is determined that the ink end flag 56 is set (step S01: YES), it means that the printing operation is stopped due to an ink end. In this case, the control unit 40 shifts the process to step S41 of FIG. 8 to be described later, and displays a display that prompts the user to perform a reset on the ink tank 11 in which the ink end flag 56 is set. Note that when the ink end flag 56 is set in any of the ink tanks 11, the printer 110 is not ready for a printing operation until a reset process is executed by the user.

  In step S <b> 02, the control unit 40 determines whether or not the count end flag 54 is set in the storage unit 50. When it determines with the count end flag 54 not being set (step S02: NO), the control part 40 advances a process to step S03.

  On the other hand, when it is determined that the count end flag 54 is set (step S02: YES), the control unit 40 proceeds to step S09 to execute periodic notification, and proceeds to step S03. . In the periodic notification in step S09, a first message that prompts the user to visually check the remaining amount of ink IK in the ink tank 11 is repeatedly displayed on the display unit 47 (see FIG. 2).

  As described above, the fact that the count end flag 54 is set means that the ink IK exceeding the maximum consumable capacity of the ink tank 11 has been consumed in the latest consumption count. Therefore, when the count end flag 54 is set even though the ink end flag 56 is not set (there is a remaining amount of ink IK), the latest consumption amount count value and the actual ink IK usage amount are set. It is desirable that the user visually confirm the remaining amount of the ink IK. Therefore, while the count end flag 54 is set, the periodic notification in step S09 is executed every time YES is determined in step S02.

  When the count end flag 54 is set even though the ink end flag 56 is not set, the sensor 19 (the pair of electrodes 15 and 16) and the detection circuit detect the presence or absence of ink. May occur, and the absence of ink IK at a predetermined height of the ink tank 11 may not be detected. Also in such a case, the user can visually recognize that the ink IK in the ink tank 11 has disappeared by visually confirming the remaining amount of the ink IK. You can be noticed.

  In step S <b> 03, the control unit 40 determines whether the sensor end flag 55 is set in the storage unit 50. When it determines with the sensor end flag 55 not being set (step S03: NO), the control part 40 advances a process to step S04. On the other hand, when it determines with the sensor end flag 55 being set (step S03: YES), the control part 40 transfers a process to step S10 mentioned later.

  In step S04, the control unit 40 performs ink presence / absence detection by the sensor 19 (the pair of electrodes 15 and 16). In subsequent step S05, the control unit 40 determines whether or not the ink IK is present at a predetermined height (remaining amount level L2 shown in FIG. 5) in the ink tank 11 based on the detection result of the presence or absence of ink. .

  When it is determined that the ink IK is present at the predetermined height in the ink tank 11 (step S05: YES), the control unit 40 advances the process to step S06. On the other hand, when it is determined that there is no ink IK at a predetermined height in the ink tank 11, that is, it is a sensor end (step S05: NO), the control unit 40 proceeds to step S14 to be described later.

  In step S06, the control unit 40 refers to the latest consumption count 51 stored in the storage unit 50, and determines whether or not it is a count end, that is, whether or not the latest count value has reached a predetermined limit value. judge. When it is determined that the count is ended (step S06: YES), the control unit 40 advances the process to step S07. On the other hand, when it determines with it not being a count end (step S06: NO), the control part 40 returns a process to a start.

  In step S07, the control unit 40 sets the count end flag 54 in the storage unit 50 for the ink tank 11 determined to be the count end. In subsequent step S08, the control unit 40 starts a periodic notification (first message) in order to prompt the user to visually confirm the remaining amount of the ink IK in the ink tank 11.

  Subsequently, in step S <b> 21 shown in FIG. 7, the control unit 40 executes “automatic reset processing” for the ink tank 11 in which the count end flag 54 is set. That is, the count value stored in the latest consumption count 51 is returned to the initial value for the ink tank 11 in which the count end flag 54 is set, even if the user does not execute the reset process by manual operation. When the process proceeds from step S12 to step S21, the count value stored in the post-detection consumption count 52 together with the count value stored in the latest consumption count 51 is returned to the initial value. And the control part 40 returns a process to a start. As a result, the ink consumption count is resumed for the ink tank 11 in which the count end flag 54 is set.

  In the processing up to step S21, if it is determined in step S05 that the ink IK is at a predetermined height, but it is determined in the next step S06 that the count ends, the count value and the actual ink are determined. It can be determined that there is a deviation from the amount of IK used. Therefore, the control unit 40 sets the count end flag 54 for the target ink tank 11 in step S07, starts periodic notification in step S08, and returns the count value to the initial value in step S21. .

  Note that the execution of the reset process in step S21 is not based on the user manually replenishing the ink IK and operating it. Therefore, even after the reset process is executed and the count value returns to the initial value, until the ink end flag 56 or the sensor end flag 55 is set, the user is periodically notified (periodic of step S09). Notice execution) to encourage attention to the remaining amount of ink IK.

  Returning to FIG. 6, the control unit 40 sets the sensor end flag 55 in the storage unit 50 in step S <b> 14 for the ink tank 11 determined to be the sensor end in step S <b> 05 (step S <b> 05: NO). Start counting consumption after sensor end. The consumption count after the sensor end is calculated from the latest consumption count value when it is finally determined that the ink IK is at a predetermined height before the sensor end is determined in step S05. The count value is stored in the storage unit 50 as a post-detection consumption count 52.

  Subsequently, in step S15, when the count end flag 54 is set in the storage unit 50 for the ink tank 11 for which the sensor end flag 55 is set, the control unit 40 cancels the count end flag 54. Then, the control unit 40 stops the periodic notification.

  As described above, if it is determined in step S02 that the count end flag 54 is set, there is a difference between the count value and the actual amount of ink IK used, or there is a problem with the mechanism that detects the presence or absence of ink. It may be caused by For this reason, the control unit 40 executes periodic notification in step S09 to prompt the user to visually check the remaining amount of ink IK.

  The fact that the sensor end is determined in step S05 thereafter means that the mechanism for detecting the presence or absence of ink is functioning normally, and the remaining amount level L2 is determined in the target ink tank 11 at the time of determination. This means that the ink IK remains. Therefore, since the latest consumption count value can be corrected based on the actual remaining amount of ink IK, the control unit 40 cancels the count end flag 54 of the target ink tank 11 in step S15. And the control part 40 transfers a process to step S10.

  The ink remaining amount display after the sensor end flag 55 is set is “the predetermined amount C3 and the consumption after detection with respect to the count value corresponding to the sum of the predetermined amount C1, the predetermined amount C2 and the predetermined amount C3. Displayed based on the value of the ratio “count value corresponding to the sum with the count 52”. However, after the post-detection consumption count 52 reaches the soft count value corresponding to the sum of the predetermined amount C1, the predetermined amount C2, and the predetermined amount C3, the weight of one refill bottle (as shown in FIG. 5). The fact that the ink amount corresponding to the sum of the fixed amount C1, the predetermined amount C2, and the predetermined amount C3) has been consumed is fixedly displayed by, for example, displaying 100% ink consumption (or no remaining ink).

  In step S10, it is determined whether the count of consumption after the sensor end, that is, the count value stored in the post-detection consumption count 52 is greater than or equal to a predetermined value A. When it is determined that the consumption count after the sensor end is equal to or greater than the predetermined value A (step S10: YES), the control unit 40 advances the process to step S11. On the other hand, when it determines with the count of consumption after a sensor end being less than the predetermined value A (step S10: NO), the control part 40 returns a process to a start.

  If the consumption count after the sensor end is equal to or greater than the predetermined value A, the ink IK in the target ink tank 11 is in an ink low state below the remaining amount level L1 shown in FIG. Means. When the consumption count after the sensor end is less than the predetermined value A, it means that the ink IK in the target ink tank 11 is above the remaining amount level L1 on the count.

  In step S11, the control unit 40 performs ink presence / absence detection on the target ink tank 11 by the sensor 19 (the pair of electrodes 15 and 16). In subsequent step S12, the control unit 40 determines whether or not the ink IK is present at a predetermined height in the target ink tank 11 based on the result of ink presence / absence detection. If it is determined that there is no ink IK at the predetermined height (step S12: NO), the control unit 40 advances the process to step S13. On the other hand, when it is determined that the ink IK is present at the predetermined height (step S12: YES), the control unit 40 proceeds to step S21 in FIG.

  Steps S11 and S12 are performed after step S10. Whether or not the user refills the ink tank 11 with ink IK before the ink low is notified after the sensor end is determined in step S04 and step S05. The purpose is to confirm. The user can refill the ink tank 11 with the ink IK at any time even before the ink low notification is displayed. In addition, the user may not perform the reset process manually after replenishing the ink IK.

  If it is determined in step S12 that there is ink IK (step S12: YES), there is ink IK exceeding the remaining amount level L2 shown in FIG. 5 in the target ink tank 11, and therefore after step S04 and step S05. It is considered that the ink IK was replenished by the user. Therefore, since it is clear that there is a difference between the count value and the actual usage amount of the ink IK, the control unit 40 shifts the process to step S21 and resets the target ink tank 11. Execute.

  If it is determined in step S03 that the sensor end flag 55 has been set (step S03: YES) and the process proceeds to step S10, the consumption count after the sensor end is determined to be greater than or equal to the predetermined value A in step S10. Until it is, the presence or absence of ink is not detected by the sensor. This is because, as described above, due to the inclination of the printer 110, the bubbles of the ink IK, and the like, it is determined that the ink IK is present in the ink presence / absence detection after the ink end detection is once determined as the sensor end. This is to avoid it.

  For the ink tank 11 determined to have no ink IK at a predetermined height in step S12 (step S12: NO), the control unit 40 sets the count end flag 54 in the storage unit 50 in step S13. In this case, the count end flag 54 of the target ink tank 11 is canceled. Then, the control unit 40 stops the periodic notification.

  If it is determined in step S12 that there is no ink IK, it means that the mechanism for detecting the presence or absence of ink is functioning normally, and the count of consumption after the sensor end is equal to or greater than a predetermined value A. Therefore, it can be determined that the ink IK in the target ink tank 11 is in an ink-low state. Therefore, the control unit 40 cancels the count end flag 54 in step S13. And the control part 40 advances a process to step S22 shown in FIG.

  Here, the count end flag 54 is released in step S15, but in consideration of the case where the count end flag 54 is not released in step S15 due to the influence of electrostatic noise or the like, the count end flag 54 is set in step S13. Canceling is being executed. In this way, when the latest ink consumption count corresponds to the actual ink consumption, it is possible to prevent the periodic notification from being executed in step S09 even though it is not necessary. Can do.

  In step S22, the control unit 40 generates an ink low notification (second data) for prompting the user to replenish the ink IK and outputs the ink low notification to the display unit 47. The display unit 47 outputs the ink low notification (second data). Message). When the ink low notification is displayed, that is, when the remaining amount level L1 shown in FIG. 5 is reached, when the user replenishes the entire amount of ink IK in the refill bottle, the ink IK in the target ink tank 11 is changed. The remaining amount level L4 shown in FIG. 5 is obtained.

  In step S23, the control unit 40 counts the consumption amount after the sensor end for the target ink tank 11, that is, the count value stored in the consumption amount count 52 after detection is equal to or greater than a predetermined value (A + B−α). It is determined whether or not there is. If it is determined that the consumption count after the sensor end is equal to or greater than the predetermined value (A + B−α) (step S23: YES), the control unit 40 advances the process to step S24. On the other hand, when it is determined that the consumption count after the sensor end is less than the predetermined value (A + B−α) (step S23: NO), the control unit 40 returns the process to the start.

  Step S23 is a process for avoiding printing being interrupted (stopped) due to an ink end in the middle of a print job when printing is performed based on a user operation. Even if the consumption count after the sensor end is greater than or equal to a predetermined value (A + B), that is, when the ink end of the remaining amount level L0 shown in FIG. Printing operation stops. Therefore, it is desirable to stop the printing operation before the user performs an operation to execute printing, just before the ink end, so that the printing operation does not stop in the middle of the print job. The predetermined value α is set to a value smaller than the predetermined value A and the predetermined value B and larger than the unit consumption amount of the ink IK that executes the ink remaining amount management flow.

  In step S24, the control unit 40 determines whether a print job is being executed. When the print job is being executed (step S24: YES), the control unit 40 advances the process to step S25. When the print job is not being executed (step S24: NO), the control unit 40 advances the process to step S26.

  In step S25, the control unit 40 determines whether the count of consumption after the sensor end for the target ink tank 11, that is, the count value stored in the detected consumption count 52 is greater than or equal to a predetermined value (A + B). Determine whether or not. When it is determined that the consumption count after the sensor end is equal to or greater than the predetermined value (A + B), that is, the ink end (step S25: YES), the control unit 40 advances the process to step S26. On the other hand, when the consumption count after the sensor end is less than the predetermined value (A + B) and it is determined that the ink end is not reached (step S25: NO), the control unit 40 returns the process to the start.

  In step S <b> 26, the control unit 40 sets the ink end flag 56 in the storage unit 50 for the target ink tank 11. In step S27, the control unit 40 stops the printing operation of the printer 110, and advances the processing to step S41 shown in FIG. Therefore, if it is determined in step S25 that an ink end has occurred during execution of a print job, the printing operation is stopped in the middle of the print job. When the printing operation is stopped in step S27, the printing operation cannot be started until the user manually performs a reset.

  In step S41 shown in FIG. 8, the control unit 40 displays a message “Do you want to execute the reset process?” On the display unit 47 to prompt the user to replenish the ink IK and execute the reset process. In step S41, the user can select whether to execute the reset process (YES) or not to execute the reset process (NO).

  In subsequent step S42, the control unit 40 determines whether or not execution of the reset process has been selected by a user operation. When it determines with performing reset processing having been selected (step S42: YES), the control part 40 advances a process to step S31. On the other hand, when it determines with not having performed reset processing being performed (step S42: NO), the control part 40 advances a process to step S43.

  In step S43, the control unit 40 displays a message “Cancel print job?” On the display unit 47 and prompts the user to select whether or not to cancel the print job. In step S43, the user can select whether to cancel (YES) or not cancel (NO).

  In subsequent step S44, the control unit 40 determines whether or not canceling the print job has been selected by a user operation. If it is determined that canceling the print job has been selected (step S44: YES), the control unit 40 advances the process to step S45. On the other hand, when it is determined that it is selected not to cancel the print job (step S44: NO), the control unit 40 returns the process to step S41.

  In step S45, the print job is canceled based on the user's selection. After the print job is canceled, the printing operation of the printer 110 is maintained until the user manually resets the print job. In the printer system 100, the document can be read by the scanner 120 even in this state. Therefore, for example, the scanner 120 can be used even when the user does not have the refilling ink IK and cannot refill the ink IK.

  As described above, when it is determined in step S42 that execution of the reset process is selected (step S42: YES), the process proceeds to step S31. Regardless of which step is described above, if the user presses the reset button on the operation panel 111, the reset process can be executed manually. In this case, the process of step S31 is also performed.

  In step S31, the control unit 40 displays a message “please replenish ink” on the display unit 47 and prompts the user to replenish ink IK. In step S31, the user can select either ink replenishment (YES) or cancel ink replenishment (NO).

  In subsequent step S <b> 32, the control unit 40 determines whether or not to proceed with the ink refill by the user's operation is selected. When it is determined that the ink replenishment is selected (step S32: YES), the control unit 40 advances the process to step S33. On the other hand, when it is determined that canceling the ink refill is selected (step S32: NO), the control unit 40 returns the process to the start.

  In step S <b> 33, the control unit 40 displays a message “Please select a color” on the display unit 47 and prompts the user to confirm which color ink IK is to be replenished to which ink tank 11. .

  In step S33, the user can select the ink tank 11 for replenishing the ink IK with the color of the ink IK. When there are a plurality of ink tanks 11 of the same color ink IK, the user can select an ink tank 11 for replenishing the ink IK for each ink tank 11. Then, the user can select execution of reset after replenishing the selected ink tank 11 with the ink IK. The user can also select to return the process to step S31.

  When the printing operation is stopped due to the ink end, that is, when the user replenishes the entire amount of ink IK in the refill bottle in the ink tank 11 at the remaining amount level L0 shown in FIG. The ink IK has a remaining amount level L3 shown in FIG.

  In subsequent step S34, the control unit 40 determines whether or not the target ink tank 11 has been selected by the user's operation and execution of reset has been selected. When it determines with execution of reset having been selected (step S34: YES), the control part 40 advances a process to step S35. On the other hand, when it determines with returning to step S31 having been selected (step S34: NO), the control part 40 returns a process to step S31.

  In step S35, the control unit 40 performs ink presence / absence detection on the ink tank 11 selected by the user. In subsequent step S <b> 36, the control unit 40 determines whether or not the ink IK is present at a predetermined height in the ink tank 11 selected by the user based on the result of ink presence / absence detection. When it is determined that the ink IK is present at the predetermined height (step S36: YES), the control unit 40 advances the process to step S37.

  In step S37, the control unit 40 determines that the ink IK is present at a predetermined height in the ink tank 11 selected by the user, and confirms that the user has replenished the ink IK. To do. In step S38, the control unit 40 displays on the display unit 47 that the reset process has been completed. As a result, the count value of the ink consumption stored in the latest consumption count 51 and the detected consumption count 52 for the ink tank 11 selected by the user returns to the initial value. And the control part 40 returns a process to a start. As a result, counting of the ink consumption is resumed.

  On the other hand, when it is determined in step S36 that there is no ink IK at the predetermined height (step S36: NO), the control unit 40 advances the process to step S39. In this case, it is considered that the ink IK is not replenished by the user or the amount of the replenished ink IK is insufficient. Therefore, in step S39, the control unit 40 displays on the display unit 47 that the reset process has failed for the target ink tank 11 to the user. Until the user refills the ink IK and executes a reset, the state in which the printing operation of the printer 110 is stopped is maintained.

  As described above, according to the ink remaining amount management method according to the first embodiment, the control unit 40 uses the sensor 19 (the pair of electrodes 15 and 16) each time the ink IK corresponding to the unit consumption is consumed. When the ink presence / absence detection is executed and the ink IK of the predetermined value A is consumed after the sensor end, the ink low is displayed and the user is notified. Therefore, even if the user does not care about the remaining amount of ink IK in the ink tank 11 (without visually checking each time), if the ink low notification is displayed, if the ink IK is replenished and the reset process is executed, Printing can be continued.

  When the ink IK of a predetermined value (A + B) or more is consumed after the sensor end, the ink end is displayed and notified to the user, and the printing operation of the printer 110 is stopped. It is done.

  If the ink tank 11 is filled with the total amount of ink IK stored in the refill bottle when the ink low or ink end is notified and the reset process is executed, the count value and the actual amount of ink IK used can be calculated. There is no significant shift between the two. Therefore, the remaining amount of ink IK in each ink tank 11 is grasped based on a guideline of the remaining amount of ink IK displayed on the monitor of the computer 49 (see FIG. 2) when the user performs an operation to execute printing. be able to.

  If the user may be able to use a different guide for the remaining amount of ink IK displayed on the monitor of the computer 49, the user can add more ink IK to the ink tank 11 at any time. It can also be used continuously. If the ink tank 11 has the ink IK even if it reaches the count end (if it does not become the ink end), the printing operation does not stop, so that it is possible to reduce the burden that the user is forced to perform unnecessary operations. In the unlikely event that a failure occurs in the mechanism that detects the presence or absence of ink using a sensor, a periodic notification is issued to prompt the user to visually check the remaining amount of ink IK. Can be noticed.

  Furthermore, the user can manually execute the reset process by pressing the reset button on the operation panel 111 at any timing of the ink remaining amount management flow. Therefore, if the user wants to correct the situation where the estimated ink IK remaining amount displayed on the monitor of the computer 49 is different from the actual ink IK remaining amount, the reset process can be started manually. By replenishing the IK and executing it according to the display on the display unit 47, the correction can be easily made when necessary.

(Second Embodiment)
In the second embodiment, in contrast to the sensor 19 of the first embodiment, the ink supply unit includes an optical sensor including a light emitting unit and a light receiving unit as sensors, and the light emitted from the light emitting unit and received by the light receiving unit. Although the configuration is such that it is determined whether there is ink at a predetermined height in the ink tank due to the difference in strength, the basic configuration of the printer system and the ink remaining amount management method are the same. Here, a difference between the ink supply unit and the first embodiment will be described.

<Configuration of ink supply unit>
FIG. 9A is a plan view illustrating a schematic configuration of an ink supply unit according to the second embodiment. FIG. 9B is a cross-sectional view taken along the line BB ′ of FIG. 9A. 10A is a cross-sectional view taken along the line DD ′ of FIG. 9A. 10B is a cross-sectional view taken along line EE ′ of FIG. 9A. 10A is a cross-sectional view taken along the line DD ′ of FIG. 9A. 11A is a cross-sectional view taken along the line CC ′ of FIG. 9A. FIG. 11B is a graph showing the intensity of light detected by the optical sensor in response to a decrease in ink in the ink supply unit according to the second embodiment. Constituent elements common to the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIG. 9A, the ink supply unit 60 according to the second embodiment determines whether or not there are four ink tanks 61 (61a, 61b, 61c, 61d) and the ink IK at a predetermined height. An optical sensor 67 as a sensor for performing the operation, a holding unit 68, and a detection substrate 69 are provided. Each of the ink tanks 61a, 61b, 61c, and 61d has an injection port 62 and concave portions 63a, 63b, 63c, and 63d that are recessed toward the −X direction.

  The ink supply unit 60 differs from the ink supply unit 10 of the first embodiment in the configuration of the four ink tanks 61a, 61b, 61c, 61d, but the user receives the ink IK stored in another container. The point that the ink tank 61 can be replenished by being injected from the inlet 62 is the same. Further, the capacities of the four ink tanks 61a, 61b, 61c, 61d, and the setting of the predetermined amounts C1, C2, C3, C4, C5 and the predetermined values A, B (see FIG. 5) are the same as in the first embodiment. It is.

  The optical sensor 67 includes a sensor unit 66 including a light emitting unit 66a and a light receiving unit 66b, and a light shielding member 64, and is disposed in each of the ink tanks 61a, 61b, 61c, and 61d. The light emitting part 66a and the light receiving part 66b are provided outside the ink tanks 61a, 61b, 61c, 61d corresponding to the recesses 63a, 63b, 63c, 63d, respectively. The light emitting unit 66a and the light receiving unit 66b are disposed so as to face each other along the Y-axis direction with the recesses 63a, 63b, 63c, and 63d interposed therebetween.

  The light emitting unit 66a is configured by, for example, an LED (Light Emitting Diode), and the light receiving unit 66b is configured by, for example, a phototransistor. The light emitting unit 66a and the light receiving unit 66b are held by the holding unit 68 and are connected to the detection substrate 69 via a connector (not shown). The light shielding member 64 is provided in the ink tanks 61a, 61b, 61c, 61d. In the ink tanks 61a, 61b, 61c, 61d, each light shielding member 64 is pivotally supported by a pivot shaft 65 extending along the Y-axis direction.

  The cross section shown in FIG. 9B is a YZ cross section cut at the position of the rotation shaft 65 in the X-axis direction of FIG. 9A. As shown in FIG. 9B, the recesses 63a, 63b, 63c, and 63d are disposed above the ink tanks 61a, 61b, 61c, and 61d (+ Z direction side). In FIG. 9B, the heights of the liquid levels of the inks IKb and IKd stored in the ink tanks 61b and 61d are equal to or higher than a predetermined height, and the heights of the liquid levels of the inks IKa and IKc stored in the ink tanks 61a and 61c. It is assumed that the height is less than a predetermined height.

  As shown in FIG. 10A, the light shielding member 64 has a light shielding part 64a, an arm part 64c, and a float part 64d. The arm portion 64 c has a substantially L shape including a portion extending along the side wall of the ink tank 61 and a portion extending along the bottom of the ink tank 61. The light shielding part 64a is a member that shields light. The light shielding part 64a is connected to the −X direction side of the end part on the + Z direction side of the arm part 64c. A protrusion 64b is provided on the lower side (−Z direction side) of the light shielding portion 64a. The float portion 64d is a member that floats lighter in specific gravity than the ink IKb (IK). The float part 64d is connected to the −Z direction side end and the + X direction side end part of the arm part 64c.

  In the ink tank 61 (61b), the light shielding portion 64a is disposed on the upper side (+ Z direction side), and the float portion 64d is disposed on the bottom side (−Z direction side). The light shielding member 64 is pivotally supported by the pivot shaft 65 at a substantially L-shaped corner of the arm portion 64c. The light shielding member 64 as a whole may be made of a material having a specific gravity smaller than that of the ink IK, or may be formed as a hollow body having a cavity inside.

  In the ink tank 61b in which the ink IKb having a predetermined height or more is stored, the float portion 64d is immersed in the ink IKb, and therefore, as shown by the arrow in FIG. A force acts in the direction in which 64d is lifted, and the light shielding portion 64a is disposed in the recess 63b. The light blocking member 64 is maintained in this posture until the liquid level of the ink IKb is lowered by the protrusion 64b hitting the inner wall of the recess 63b. In this posture, the light shielding part 64a is arranged so as to overlap the light emitting part 66a in a plan view from the + Y direction side. When the ink IKb is consumed and the liquid level becomes equal to or less than the height of the float part 64d, the float part 64d follows the lowering of the liquid level and descends to the bottom side (−Z direction side) of the ink tank 61b.

  As shown in FIG. 10B, in the ink tank 61c in which the liquid level of the ink IKc is reduced to be less than a predetermined height, the float portion 64d descends to the bottom side (−Z direction side), thereby blocking the light shielding member. 64 rotates in the direction indicated by the arrow in FIG. 10B. Thereby, since the light shielding part 64a moves to the + X direction side, the light shielding part 64a is disposed so as not to overlap the light emitting part 66a in a plan view from the + Y direction side.

  In FIG. 9B, in the ink tank 61d in which the liquid level of the ink IKd is equal to or higher than a predetermined height, the light shielding portion is seen in a plan view from the + Y direction side, like the ink tank 61b shown in FIG. 10A. 64a is disposed so as to overlap the light emitting portion 66a. In addition, in the ink tank 61a in which the liquid level of the ink IKa is less than the predetermined height, the light shielding unit 64a is a light emitting unit in a plan view from the + Y direction side, similarly to the ink tank 61c shown in FIG. 10B. It arrange | positions so that it may not overlap with 66a.

  The cross section shown in FIG. 11A is a YZ cross section cut at the position of the sensor unit 66 in the X-axis direction of FIG. 9A. As shown in FIG. 11A, in the ink tanks 61b and 61d in which the liquid levels of the inks IKb and IKd are equal to or higher than a predetermined height, the light EL emitted from the light emitting unit 66a is shielded by the light shielding unit 64a. Therefore, no light is received by the light receiving unit 66b. On the other hand, in the ink tanks 61a and 61c in which the liquid levels of the inks IKa and IKc are less than a predetermined height, the light EL emitted from the light emitting unit 66a is not shielded by the light shielding unit 64a, and the light receiving unit Light is received at 66b.

  FIG. 11B is a diagram showing a change in the intensity of the light EL received by the light receiving unit 66b in accordance with the change in the posture of the light shielding member 64 from the state shown in FIG. 10A to the state shown in FIG. 10B. The horizontal axis of FIG. 11B indicates time (corresponding to the amount of ink IK consumed), and the vertical axis indicates the intensity of the light EL received by the light receiving unit 66b. The intensity of the light EL received by the light receiving unit 66b is calculated based on, for example, an output voltage output according to the amount of light received by the light receiving unit 66b.

  The state shown in FIG. 10A is t1, and the state shown in FIG. 10B is t2. V0 is the light intensity when the light receiving unit 66b is not receiving the light EL, and V1 is the light intensity when the light receiving unit 66b is receiving the light EL. At t1, the light intensity is V0 because the light EL is shielded by the light shielding portion 64a and is not received by the light receiving portion 66b. When the ink IK is consumed with time and reaches t2, the light intensity is V1 because the light EL is received by the light receiving unit 66b. When the light intensity reaches V1, the control unit 40 (liquid level lowering determination unit 43) determines “sensor end”.

  As described above, in the second embodiment, the ink tank 61 has a predetermined height from the bottom portion based on the difference in the intensity of the light EL emitted from the light emitting portion 66a constituting the optical sensor 67 and received by the light receiving portion 66b. Whether ink IK is present or not can be detected. Also in the second embodiment, as in the first embodiment, the control unit 40 determines whether or not the ink IK is present at a predetermined height in the ink tank 61, and determines that it is a sensor end. For the ink tank 61, the sensor end flag 55 is set in the storage unit 50, and the consumption after the sensor end is started. Also in the second embodiment, the remaining amount management of the ink is performed in the same way as in the first embodiment, so that detailed attention is not paid to the timing of replenishing the liquid, the amount of liquid at the time of replenishment, and the input operation. However, the printer can be used continuously, and the risk of idling can be suppressed even under such usage conditions.

  The above-described embodiments merely show one aspect of the present invention, and can be arbitrarily modified and applied within the scope of the present invention. As modifications, for example, the following can be considered.

(Modification 1)
In the above embodiment, the refilling ink IK is provided in a refill bottle, the capacity of the refill bottle is smaller than the maximum consumable capacity of the ink tanks 11 and 61, and the total amount of the ink IK stored in the refill bottle. However, the present invention is not limited to such a form. For example, the capacity of the refill bottle may be larger than the maximum consumable capacity of the ink tanks 11 and 61, or the refilling ink IK is provided in a bag-shaped container instead of a bottle-shaped container. There may be.

  As described above, in the printer 110, since the control unit 40 determines the ink low and the ink end based on the count value based on the time point when the sensor end is determined by the presence / absence detection of the ink by the sensor, the ink IK is repeatedly added. Thus, the ink low and the ink end can be accurately determined even in the usage method of replenishing. Therefore, if the user is careful not to overflow the ink IK from the ink tanks 11 and 61 when replenishing the ink IK, it is possible that the user is in the idle state without paying close attention to the timing and replenishment amount of the ink IK. The printer 110 can be used without generating the above.

(Modification 2)
In the above embodiment, the sensor 19 and the optical sensor 67 are provided as sensors, and it is configured to determine whether or not the ink IK is present at a predetermined height in the ink tanks 11 and 61. It is not limited to such a form. The sensor is not limited to a sensor that determines whether or not the ink IK is present at a predetermined height in the ink tanks 11 and 61, and whether or not the remaining amount of the ink IK in the ink tanks 11 and 61 is a predetermined amount. For example, a sensor equipped with a weight sensor may be used to determine whether or not the remaining amount of ink IK in the ink tanks 11 and 61 is a predetermined amount based on a difference in weight. .

(Modification 3)
In the above embodiment, the printer system 100 that is a multifunction machine including the printer 110 and the scanner 120 as a liquid consuming apparatus has been described as an example. However, the present invention is not limited to such a form. The liquid consuming device may be a single-function printer 110 that does not include the scanner 120.

(Modification 4)
In the above embodiment, an example in which the present invention is applied to a printer and an ink tank has been described, but the present invention is not limited to such a form. The present invention may be used, for example, in a liquid consuming apparatus that ejects or discharges liquid other than ink, and is also applicable to a liquid container that contains such liquid.

(Modification 5)
In the above embodiment, it is determined whether or not the user has selected “reset execution” in step S34 of FIG. 8, but the present invention is not limited to such a form. Instead of “reset execution”, “ink replenishment?” May be displayed as a message display for the user to select in step S34.

  11, 11a, 11b, 11c, 11d, 61, 61a, 61b, 61c, 61d ... Ink tank (liquid container), 15 ... Electrode (pair of electrodes), 16 ... Electrode (pair of electrodes), 19 ... Sensor, 40 ... Control part, 42 ... Consumption calculating part, 47 ... Display part, 50 ... Storage part, 55 ... Sensor end flag, 64 ... Light shielding member, 66 ... Sensor part, 66a ... Light emitting part, 66b ... Light receiving part, 67 ... Light Sensor (sensor), 110 ... Printer (liquid consumption device), 111 ... Operation panel (user interface unit), IK ... Ink (liquid), IKa ... Black ink (liquid), IKb, IKc, IKd ... Color ink (liquid) .

Claims (12)

A liquid consuming device in which a liquid container for storing a liquid is fixed, and a user can replenish the liquid in the liquid container,
A consumption calculation unit for calculating the consumption of the liquid;
A storage unit for storing a count value updated based on the consumption amount of the liquid calculated by the consumption amount calculation unit;
A sensor for detecting whether the liquid is present at a predetermined position in the liquid container;
A control unit that performs liquid presence / absence detection of whether or not the liquid is present by the sensor, and
The control unit executes the reset process when it is determined that the liquid is present by performing the liquid presence / absence detection before executing the reset process for returning the count value to the initial value. Consuming device. The liquid consuming device according to claim 1,
The control unit executes the reset process when it is determined that the liquid is present by performing the liquid presence / absence detection and the count value is equal to or larger than a value corresponding to the capacity of the liquid container. Liquid consumption device characterized. The liquid consuming device according to claim 1,
A sensor end flag that is set when the controller executes the liquid presence detection and determines that the liquid is not present;
The control unit counts after the sensor end based on the amount of consumption of the liquid calculated from the time when the sensor end flag is set and it is determined that the liquid is finally present before the sensor end flag is set. The liquid consuming device, wherein the reset process is executed when the value is equal to or greater than a first predetermined value and the presence / absence of the liquid is detected and it is determined that the liquid is present. The liquid consuming device according to any one of claims 1 to 3,
A user interface unit including a display unit for displaying a message to the user;
The controller determines the amount of the liquid remaining in the liquid container for the user after executing the reset process until performing the liquid presence detection until it is determined that the liquid is not present. Generating first data for displaying a first message prompting confirmation to be output to the user interface unit;
The liquid consuming apparatus, wherein the user interface unit displays the first message on the display unit based on the first data output from the control unit. The liquid consuming device according to claim 4,
The user interface unit can accept an input from the user to replenish the liquid in the liquid container,
The control unit executes the reset process when it is determined that the liquid is present by performing the liquid presence / absence detection after the user interface unit receives an input to replenish the liquid. Liquid consumption device. The liquid consuming device according to claim 1,
A user interface unit that includes a display unit that displays a message for the user, and that can accept an input from the user to replenish the liquid in the liquid container;
A sensor end flag that is set when the controller executes the liquid presence detection and determines that the liquid is not present,
The control unit counts after the sensor end based on the amount of consumption of the liquid calculated from the time when the sensor end flag is set and it is determined that the liquid is finally present before the sensor end flag is set. If the value is equal to or greater than the first predetermined value and the liquid presence / absence detection is performed and it is determined that there is no liquid, the count value after the sensor end is the first predetermined value and the second predetermined value. Stop the operation of consuming the liquid when the total value of
After the operation of consuming the liquid is stopped, the reset process is performed when it is determined that the liquid is present by executing the liquid presence detection after the user interface unit receives an input to replenish the liquid. And a liquid consuming device that enables the operation of consuming the liquid. The liquid consuming device according to claim 6,
When the count value after the sensor end is equal to or greater than the first predetermined value and the liquid presence / absence detection is performed and it is determined that the liquid is not present, the control unit causes the user to store the liquid container. Generating second data for displaying a second message for prompting replenishment of the liquid and outputting the second data to the user interface unit;
The liquid consuming apparatus, wherein the user interface unit displays the second message on the display unit based on the second data output from the control unit. The liquid consuming device according to claim 6 or 7,
The liquid for the user to refill the liquid container is contained in a refill container separate from the liquid consuming device,
The liquid consuming device characterized in that when the count value after the sensor end becomes equal to or greater than the first predetermined value, the volume of the liquid that can be accommodated in the liquid container is equal to or greater than the capacity of the replenishing container. . The liquid consuming device according to any one of claims 1 to 8,
The liquid consumption device according to claim 1, wherein the control unit performs the liquid presence / absence detection and updates the count value every time a predetermined amount of the liquid is consumed. The liquid consuming device according to any one of claims 1 to 9,
A plurality of the liquid containers for individually storing a plurality of liquids of different types;
The consumption calculation unit calculates the consumption of each liquid for each liquid container,
The storage unit stores the count value that is individually updated based on the consumption amount of each liquid for each liquid container,
The sensor is arranged for each liquid container,
The liquid consumption device according to claim 1, wherein the control unit performs the liquid presence detection before returning the count value to an initial value for each liquid container. The liquid consuming device according to any one of claims 1 to 10,
The sensor is composed of a pair of electrodes arranged in the liquid container,
The said control part determines whether the said liquid exists in the said predetermined position based on the resistance value between a pair of said electrodes, The liquid consumption apparatus characterized by the above-mentioned. The liquid consuming device according to any one of claims 1 to 10,
The sensor includes a light shielding member that is arranged in the liquid container and moves in accordance with the amount of the liquid in the liquid container, and a light emitting unit and a light receiving unit arranged outside the liquid container,
The liquid consumption apparatus according to claim 1, wherein the control unit determines whether or not the liquid is present at the predetermined position based on an intensity of light emitted from the light emitting unit and received by the light receiving unit.

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