Liquid supply apparatus, liquid discharge apparatus, and control method thereof

Abstract

A liquid supply device, a liquid ejection device, and a control method thereof are provided to prevent the liquid container from being mistakenly removed during use. The liquid supply device includes: a supply flow path connected to a liquid ejection head capable of ejecting liquid; a first supply flow path connecting a first liquid container containing liquid to the supply flow path; and a second supply flow path connecting a second liquid container to the supply flow path, wherein the second liquid container contains a liquid of the same type as the liquid contained in the first liquid container. The liquid ejection device includes: a switching unit capable of switching between the first and second supply flow paths connected to the supply flow path; and a movement limiting unit capable of selectively limiting the movement of the first and second liquid containers in conjunction with the switching unit.

Description

Technical Field

[0001] This invention relates to a liquid supply device, a liquid ejection device, and a control method thereof. Background Technology

[0002] Patent Document 1 discloses an inkjet recording method image forming apparatus, as an example of a liquid ejection device that switches between multiple liquid containers (e.g., ink tanks) supplying liquid to a liquid ejection head 20 capable of ejecting liquid. This image forming apparatus includes: two liquid containers for each color; a common piping for ink flowing from the liquid containers and into the recording head; and a switching valve that selectively switches which of the two liquid containers supplies ink to the recording head. If a sensor detects that the ink in the one currently in use of the two liquid containers is depleted, the switching valve is controlled based on this detection result to switch the liquid container supplying ink to the recording head from one to the other. Thus, image forming can be performed continuously without interruption.

[0003] When switching from one liquid container that has run out of ink to another, this image forming apparatus displays the currently used liquid container on the operation panel. This allows the user of the image forming apparatus to know which liquid container is currently in use and to replace the run-out liquid container with a new one as needed. Thus, the image forming apparatus described in Patent Document 1 possesses a so-called hot-swap function, enabling the removal and replacement of a run-out liquid container with a new one during printing.

[0004] Patent Document 1: Japanese Patent Application Publication No. 2010-194915

[0005] However, in hot-swappable liquid ejection devices, during printing, there is a possibility that the liquid container in use might be mistakenly removed due to misplacement with the liquid container intended for replacement. In such cases, there is a technical problem that the liquid ejection device may malfunction due to the removal of the liquid container in use. It should be noted that this malfunction is not limited to printing; it can also occur during liquid consumption operations where the liquid ejector head consumes liquid, if the liquid container in use is removed. As for liquid consumption operations other than printing, there are maintenance operations such as discharging liquid from the nozzle of the liquid ejector head for maintenance purposes. Summary of the Invention

[0006] A liquid supply device for solving the above-mentioned technical problems includes: a supply flow path connected to a liquid nozzle capable of ejecting liquid; a first supply flow path connected to a first liquid container containing liquid; a second supply flow path connected to a second liquid container containing liquid of the same type as the liquid contained in the first liquid container; a switching unit capable of switching between the first and second supply flow paths connected to the first supply flow path; and a movement limiting unit capable of selectively limiting the movement of the first and second liquid containers in conjunction with the switching unit.

[0007] The liquid ejection device for solving the above-mentioned technical problems includes: a liquid ejection head capable of ejecting liquid; the liquid supply device; and a control unit for controlling the switching unit and the movement restriction unit.

[0008] Regarding the control method for the liquid ejection device that solves the above-mentioned technical problems, the liquid ejection device includes: a liquid ejection head for recording the ejection of liquid from a medium; a supply flow path connected to the liquid ejection head; a first supply flow path connected to a first liquid container containing liquid; a second supply flow path connected to a second liquid container containing liquid of the same type as the liquid contained in the first liquid container; a switching unit capable of switching between the first and second supply flow paths connected to the first supply flow path; and a movement limiting unit capable of selectively limiting the first liquid container and the liquid containing liquid of the same type as the liquid contained in the first liquid container in conjunction with the switching unit. The method for controlling the movement of the second liquid container includes: when a command to consume liquid is given, connecting either the first or second supply path to the supply path via the switching unit, and restricting the movement of the liquid container connected to the supply path via the movement restriction unit; performing the liquid consumption operation; and after performing the operation, connecting both the first and second supply paths to a state where they are not connected to the supply path via the switching unit, and releasing the movement restriction of both the first and second liquid containers via the movement restriction unit.

[0009] Regarding the control method for the liquid ejection device that solves the above-mentioned technical problems, the liquid ejection device includes: a liquid ejection head for recording the ejection of liquid from a medium; a supply flow path connected to the liquid ejection head; a first supply flow path connecting a first liquid container containing liquid to the supply flow path; a second supply flow path connecting a second liquid container containing a liquid of the same type as the liquid contained in the first liquid container to the supply flow path; a switching unit capable of switching between the first and second supply flow paths connected to the supply flow path; and a movement limiting unit capable of selectively limiting the first liquid container in conjunction with the switching unit. The method for controlling the movement of the liquid container and the second liquid container includes: when power is connected, connecting either the first supply flow path or the second supply flow path to the supply flow path via the switching unit, and restricting the movement of the liquid container connected to the supply flow path via the movement restriction unit; and when a command to cut off the power is received, connecting both the first supply flow path and the second supply flow path to a state where they are not connected to the supply flow path via the switching unit, and releasing the restriction on the movement of the first liquid container and the second liquid container via the movement restriction unit. Attached Figure Description

[0010] Figure 1 This is a perspective view of the liquid ejection device according to the first embodiment.

[0011] Figure 2 This is a perspective view of the liquid supply device viewed from the front side.

[0012] Figure 3 This is a perspective view of the liquid supply device from the rear side.

[0013] Figure 4 This is a schematic diagram showing the general structure of a liquid ejection device.

[0014] Figure 5 It is a three-dimensional diagram representing part of the supply structure.

[0015] Figure 6 This is a partial side view of the supply structure.

[0016] Figure 7 It is a three-dimensional diagram representing part of the supply structure.

[0017] Figure 8 This is a perspective view showing a portion of the second drive mechanism.

[0018] Figure 9 It is a state change diagram that represents the changes in the state of the supply mechanism.

[0019] Figure 10 This is a diagram showing the changes in the operation of the opening and closing valves and locking mechanisms in slots 1 and 2.

[0020] Figure 11 It is a cam change diagram showing the change in the rotational position of each cam that actuates the opening and closing valves and locking mechanisms of slots 1 and 2.

[0021] Figure 12 This is a flowchart representing the liquid supply control process.

[0022] Figure 13 This is a flowchart illustrating the liquid supply control process of the second embodiment. Detailed Implementation

[0023] Hereinafter, an embodiment of the liquid supply device and the liquid ejection device will be described with reference to the accompanying drawings. The liquid ejection device is, for example, an inkjet printer that ejects liquid such as ink from a medium such as paper and prints it.

[0024] In the attached diagram, assuming the liquid ejection device 11 is placed on a horizontal surface, the Z-axis represents the direction of gravity, and the X and Y axes represent the directions along the horizontal surface. The X, Y, and Z axes are orthogonal to each other. In the following description, the direction along the X-axis will be referred to as the width direction X, the direction along the Y-axis will be referred to as the depth direction Y, and the direction along the Z-axis will be referred to as the vertical direction Z.

[0025] Structure of the liquid ejection device

[0026] like Figure 1 As shown, the liquid ejection device 11 includes: a liquid ejection head 20 capable of ejecting liquid; a liquid supply device 30 for supplying liquid to the liquid ejection head 20; and a control unit 25. The liquid supply device 30 includes a supply flow path 35 communicating with the liquid ejection head 20.

[0027] The liquid supply device 30 includes an assembly section 31 capable of detachably inserting multiple liquid containers 40. The assembly section 31 includes a housing 32 capable of housing the multiple liquid containers 40. The housing 32 includes multiple receiving spaces, i.e., slots 32A, capable of individually inserting the multiple liquid containers 40. The assembly section 31 includes a locking part 33 that engages with the liquid containers 40 inserted into the slots 32A. The locking part 33 is installed in each slot 32A within the housing 32. The locking part 33 functions to lock the liquid containers 40 in a manner that prevents the user from removing them during printing.

[0028] The liquid container 40 contains the liquid supplied to the liquid nozzle 20. In other words, the liquid container 40 is a liquid supply source that supplies liquid to the liquid nozzle 20. In this example, the liquid nozzle 20 ejects ink or the like, which is an example of a liquid. Therefore, the liquid container 40 contains ink, which is an example of a liquid. The liquid container 40 is, for example, an ink cartridge or a liquid container. It should be noted that the liquid container 40 can also be a liquid container such as an ink tank that can be refilled by the user, as long as it is a structure that can be detached from the mounting part 31.

[0029] In this embodiment, the liquid nozzle 20 sprays out multiple liquids. The assembly part 31 can insert each of a plurality of liquid containers 40 that contain liquids of the same type among the multiple liquids that the liquid nozzle 20 can spray. Figure 1 In the example shown, the assembly unit 31 can insert N sets (e.g., 3 sets) of liquid containers 40 containing the same type of liquid. It should be noted that the N sets of liquid containers 40 containing the same type of liquid can be one set or multiple sets. Furthermore, in the case where an example of liquid is ink, the type of liquid is, for example, the type of ink. The type of ink is, for example, the type of ink color.

[0030] like Figure 1 As shown, the liquid ejection device 11 includes a housing 13 that houses the liquid ejection head 20. The housing 13 may also be a structure supported by a pair of legs 12. The liquid supply device 30 is as follows... Figure 1 As shown, it can be set independently of the housing 13 or it can be set integrally with the housing 13.

[0031] In the liquid ejection device 11 of this embodiment, the liquid ejection head 20 ejects liquid toward the medium 14. In the case where the liquid is ink, the liquid ejection device 11 prints on the medium 14 by ejecting ink from the liquid ejection head 20. Therefore, the liquid ejection device 11 may also include a transport section 23 for transporting the medium 14. Here, the medium 14 may be a strip or a structure cut to a predetermined length. If the medium 14 is paper, it may be a roll of paper or a single sheet of paper.

[0032] like Figure 1As shown, the transport unit 23 can also be a roller transport method that transports a strip of medium 14 from a roller body (not shown) wound into a roller shape. The transport unit 23 may also include: an extraction unit 15 that unwinds and extracts the medium 14 wound in an overlapping roller shape; a guide unit 16 that guides the medium 14 discharged from the housing 13 after printing; and a recovery unit 17 that winds up and recovers the medium 14. In addition, the transport unit 23 may also include: a tension applying mechanism 18 that applies tension to the medium 14 recovered to the recovery unit 17. In addition, the transport unit 23 has: a transport roller (not shown) that can transport the medium 14 toward a recording position facing the liquid ejector head 20. The liquid ejector head 20 prints on the medium 14 by ejecting liquid such as ink toward the medium 14 transported by the transport unit 23.

[0033] The recording method for the liquid ejector head 20 can also be... Figure 1 The serial recording method shown can also be a line recording method. The liquid ejection device 11, as a serial recording device, includes a carriage 21 that moves the liquid ejection head 20. The liquid ejection device 11 prints onto the medium 14 by alternately performing recording and conveying operations. The recording operation is the action of ejecting liquid from the liquid ejection head 20 midway through the movement of the carriage 21 in the width direction X, which intersects the conveying direction of the medium 14. The conveying operation is the action of the conveying unit 23 conveying the medium 14 to the next recording position.

[0034] It should be noted that, in the case of a line print configuration, the liquid ejector head 20 is composed of a line print head or a multi-head configuration having multiple nozzles capable of simultaneously recording across the entire width of the medium 14. The liquid ejection device 11 prints onto the medium 14 by ejecting liquid from the nozzles of the liquid ejector head 20 relative to the medium 14 being conveyed at a predetermined conveying speed. Here, a line print head refers to a long, narrow head. A multi-head configuration refers to a structure in which multiple unit heads are arranged across the entire width of the medium 14.

[0035] Additionally, the liquid ejection device 11 may also include a maintenance unit 22 for maintaining the liquid ejection head 20. The maintenance unit 22 performs a maintenance operation that forcibly discharges liquid from the nozzle of the liquid ejection head 20. During the printing operation of the liquid ejection head 20 to form an image, there are active nozzles that eject liquid and non-active nozzles that do not eject liquid; the liquid in the non-active nozzles gradually thickens. Furthermore, air bubbles sometimes mix into the liquid within the nozzles. Air dissolved in the liquid through the pipe forming the supply flow path 35 gradually grows into bubbles over a long period, and sometimes these bubbles reach the nozzles. This thickening of the liquid and the presence of air bubbles within the nozzles sometimes leads to poor liquid ejection. The maintenance unit 22 prevents or eliminates poor liquid ejection by performing a maintenance operation that discharges the thickened liquid, air bubbles, etc., from the nozzle of the liquid ejection head 20 along with the liquid. Thus, the liquid ejection head 20 consumes liquid supplied from the liquid supply device 30 not only during the printing operation but also during the maintenance operation. Therefore, in this embodiment, the actions of the liquid nozzle 20, which include printing and maintenance actions, are also referred to as liquid-consuming actions, or liquid-consuming actions.

[0036] In addition, such as Figure 1 As shown, the liquid dispensing device 11 may also include an operation panel 24 operated by the user. In this example, the side of the liquid dispensing device 11 facing the user operating the operation panel 24 is the front. The control unit 25 receives input information input by the user operating the operation panel 24. One type of input information is a printing command message that commands the liquid dispensing device 11 to perform a liquid dispensing action (e.g., a printing action). The operation panel 24 includes a power operation unit for turning the power on / off the liquid dispensing device 11. It should be noted that the operation panel 24 may also include a display unit that displays menus and operation information of the liquid dispensing device 11. In this case, the display unit may also be a touch panel with operation functions.

[0037] The liquid ejection device 11 can also be connected to the main unit 80 (see reference). Figure 4 The liquid ejector device 11 can be connected in a communicative manner. For example, a user commands the liquid ejection device 11 to perform a liquid ejection operation (e.g., a printing operation) by operating the input section of the host device 80. That is, the liquid ejection device 11 performs a printing operation to print an image onto the medium 14 based on a printing command from the operation panel 24 or the host device 80. The control unit 25 controls the liquid supply device 30, the liquid ejector head 20, and the transport unit 23. If the control unit 25 receives a printing command, it controls the liquid ejector head 20 and the transport unit 23 to perform the printing operation on the medium 14. In addition, the control unit 25 controls the liquid supply device 30 during the power-on period of the liquid ejection device 11.

[0038] Liquid supply device

[0039] Next, refer to Figure 2 as well as Figure 3 The detailed structure of the liquid supply device 30 will be described below. It should be noted that... Figure 2 , Figure 3 The liquid supply device 30 shown is in a state where the outer casing of the housing 32 has been removed. Furthermore, in the liquid supply device 30, the direction parallel to the direction in which the liquid container 40 is inserted into the assembly part 31, i.e., the insertion direction ID, is designated as the depth direction Y1. Additionally, in the liquid supply device 30, when viewing the assembly part 31 from the front (insertion port side), the long side direction of the inserted liquid container 40 is designated as the width direction X1, and the direction in which multiple liquid containers 40 are arranged is designated as the arrangement direction Z1. In this example, the width direction X1 is parallel to the width direction X of the liquid ejection device 11, and the depth direction Y1 is parallel to the depth direction Y of the liquid ejection device 11. Furthermore, the arrangement direction Z1 is parallel to the vertical direction Z. The housing 32 consists of a pair of side surfaces, a top surface, a bottom surface, and a back surface.

[0040] It should be noted that the width direction X1, depth direction Y1, and arrangement direction Z1 of the liquid supply device 30 can be appropriately changed. The arrangement direction Z1 of the plurality of liquid containers 40 inserted into the assembly part 31 can also be a different direction from the vertical direction Z. Figure 2 , Figure 3 In the example shown, the liquid supply device 30 is arranged in a longitudinal orientation with the arrangement direction Z1 parallel to the vertical direction Z, but it can also be arranged in a transverse orientation with the arrangement direction Z1 parallel to the width direction X of the liquid ejection device 11.

[0041] like Figure 2 As shown, the housing 32 constituting the assembly unit 31 is divided into multiple slots 32A capable of accommodating multiple liquid containers 40. The housing 32 is cuboid in shape. The housing 32 can accommodate multiple liquid containers 40 arranged in multiple layers along the arrangement direction Z1. An insertion port for inserting multiple liquid containers 40 is open on one side of the housing 32. Multiple liquid containers 40 are inserted from the insertion port of the housing 32 into each slot 32A. The liquid containers 40 are flat cuboids arranged in multiple layers along the arrangement direction Z1 of the housing 32 and capable of being inserted.

[0042] like Figure 2As shown, the portion of the liquid container 40 protruding from the slot 32A in the inserted state has a handle 40A. The user can insert their fingers into the handle 40A to install or remove the liquid container 40. The liquid container 40 comprises: a container with the handle 40A and a liquid pack contained within the container. The liquid container 40 can also be a structure where the user can reuse the container by replacing the liquid pack with a new one, or it can be a structure where the liquid container 40 and the container can be replaced together. In the former case, the container can also be a tray. It should be noted that the liquid container 40 can also be composed of a can containing liquid in the container with the handle 40A.

[0043] like Figure 2 As shown, the engaging part 33 has an operating part 34 operated by the user. The engaging part 33 can be moved to an engaged state where it engages with the liquid container 40 inserted into the slot 32A, and to a non-engaged state where it is not engaged. When the user replaces the liquid container 40, the operating part 34 is operated to move the engaging part 33 from the engaged state to the non-engaged state. After replacing the old liquid container 40 with a new one, the operating part 34 is operated to move the engaging part 33 from the non-engaged state to the engaged state. It should be noted that a force-applying member such as a spring (not shown) can also be used to apply force to the engaging part 33 in the direction of engaging with the liquid container 40.

[0044] like Figure 2 As shown, two liquid containers 40 containing the same type of liquid are inserted into the assembly section 31. The assembly section 31 contains a first liquid container 41 containing liquid and a second liquid container 42 containing liquid of the same type as the liquid contained in the first liquid container 41. Thus, there are two types of liquid containers 40, namely the first liquid container 41 and the second liquid container 42, each containing the same type of liquid. Therefore, the plurality of slots 32A includes a first slot SL1 for inserting the first liquid container 41 for each type of liquid and a second slot SL2 for inserting the second liquid container 42. Furthermore, the liquid dispensing device 11 is used as a liquid supply source to supply liquid to the liquid dispensing head 20, switching between the first liquid container 41 and the second liquid container 42. Figure 2 The assembly unit 31 shown includes a switching unit 38 for performing this switching.

[0045] like Figure 2 As shown, if the maximum number of liquid containers 40 that can be inserted into the assembly part 31 is set to N, then the N includes the first liquid container 41 and the second liquid container 42 of the M group containing the same type of liquid. Figure 2 In the example shown, there are M types of liquid that can be supplied to the liquid nozzle 20, and for each of the M types, there is a first liquid container 41 and a second liquid container 42.

[0046] Figure 2 In the example shown, the N liquid containment bodies 40 include: a first liquid containment body group 43 containing a first liquid, a second liquid containment body group 44 containing a second liquid, and a third liquid containment body group 45 containing a third liquid. The first liquid containment body group 43 includes a first liquid containment body 41 containing the first liquid and a second liquid containment body 42 containing the first liquid. The second liquid containment body group 44 includes the first liquid containment body 41 containing the second liquid and the second liquid containment body 42 containing the second liquid. The third liquid containment body group 45 includes the first liquid containment body 41 containing the third liquid and the second liquid containment body 42 containing the third liquid. When the liquid is ink, the type of liquid is, for example, the type of ink color. The first liquid, the second liquid, and the third liquid are each a different color of ink. The first liquid, the second liquid, and the third liquid are, for example, cyan, magenta, and yellow inks. The type of ink color can be appropriately changed. Furthermore, it is not limited to N groups consisting entirely of groups containing the same type of liquid; at least one group containing the same type of liquid is sufficient.

[0047] Figure 2 The switching unit 38 shown switches one of the first liquid container 41 and the second liquid container 42 to become a liquid supply source connected to the liquid nozzle 20. The switching unit 38 is controlled by the control unit 25. If the liquid in one of the first liquid container 41 and the second liquid container 42, which is being used as a liquid supply source, runs out (e.g., ink runs out), the switching unit 38 switches the other liquid container 40 to become the liquid supply source.

[0048] like Figure 2 As shown, the liquid supply device 30 includes a movement restriction unit 39, which can selectively restrict the movement of the first liquid container 41 and the second liquid container 42 in conjunction with the switching unit 38. The movement restriction unit 39 selectively switches the engaging portion 33, which is in an engaged state with the liquid container 40, to a restricted state where movement from the engaged state to the unengaged state is restricted, and an unrestricted state where movement from the engaged state to the unengaged state is permitted. In the restricted state, the movement restriction unit 39 locks the engaging portion 33 in the engaged state. The movement restriction unit 39 is controlled by the control unit 25.

[0049] like Figure 2 , Figure 3As shown, the engaging portion 33 includes a first engaging portion 33A capable of engaging with the first liquid container 41 and a second engaging portion 33B capable of engaging with the second liquid container 42. The first engaging portion 33A has a first operating portion 34A that allows the user to release the engagement with the first liquid container 41. The second engaging portion 33B has a second operating portion 34B that allows the user to release the engagement with the second liquid container 42. Thus, the operating portion 34 includes the first operating portion 34A of the first engaging portion 33A and the second operating portion 34B of the second engaging portion 33B. It should be noted that each operating portion 34A and 34B is not limited to being integrally formed into a single component with each engaging portion 33A and 33B, and may also be formed by components different from each engaging portion 33A and 33B. In summary, the operating units 34A and 34B are sufficient to move the engaging units 33A and 33B to the engaging state and the disengaged state.

[0050] The movement restriction unit 39 includes a first locking mechanism 391 that locks the first engaging part 33A to an engaged state and a second locking mechanism 392 that locks the second engaging part 33B to an engaged state. The first locking mechanism 391 selectively switches between a restricted state (locked state) that restricts movement of the first engaging part 33A from an engaged state to an unengaged state and a non-restricted state (locked-out state) that allows movement of the first engaging part 33A from an engaged state to an unengaged state. The second locking mechanism 392 selectively switches between a restricted state (locked state) that restricts movement of the second engaging part 33B from an engaged state to an unengaged state and a non-restricted state (locked-out state) that allows movement of the second engaging part 33B from an engaged state to an unengaged state.

[0051] When the first locking mechanism 391 is in the locked state, the user cannot operate the first operating unit 34A from the engaged state to the disengaged state. Therefore, the user cannot remove the first liquid container 41 from the first slot SL1. When the first locking mechanism 391 is in the unlocked state, the user can operate the first operating unit 34A from the engaged state to the disengaged state. Therefore, the user can remove the first liquid container 41 from the first slot SL1 and replace it with a new first liquid container 41.

[0052] Furthermore, when the second locking mechanism 392 is in the locked state, the user cannot operate the second operating unit 34B from the engaged state to the disengaged state. Therefore, the user cannot remove the second liquid container 42 from the second slot SL2. When the second locking mechanism 392 is in the unlocked state, the user can operate the second operating unit 34B from the engaged state to the disengaged state. Therefore, the user can remove the second liquid container 42 from the second slot SL2 and replace it with a new second liquid container 42.

[0053] In this embodiment, a hot-swapping method is employed whereby, during the liquid consumption operation of the two liquid containers 41 and 42 containing the same type of liquid, the one currently in use as the liquid supply source is restricted from movement and cannot be replaced, while the other, not currently in use, can be replaced without restriction from movement. Because of this hot-swapping method, the other liquid container 41 or 42 that is not currently in use during the liquid consumption operation can be replaced. Therefore, even if the liquid in the one currently in use of the two liquid containers 41 or 42 is depleted, the printing operation can be continuously performed without interruption due to the need to replace the liquid container 40 by switching the liquid supply source to the other.

[0054] like Figure 3 As shown, the assembly unit 31 includes a supply mechanism 50 to enable hot-plugging. The supply mechanism 50 includes the aforementioned switching unit 38 and movement restriction unit 39. If the liquid in one of the first liquid container 41 and the second liquid container 42 containing the same type of liquid runs out, the switching unit 38 switches the other container to be put into use. In other words, the switching unit 38 selectively switches between allowing and prohibiting the supply of liquid for the first liquid container 41 and the second liquid container 42. In addition, the movement restriction unit 39 locks the one of the first engaging part 33A and the second engaging part 33B corresponding to the liquid container 40 in use into an engaged state, and releases the lock on the other liquid container 40 corresponding to the unused liquid container 40.

[0055] like Figure 2 , Figure 3 As shown, the supply mechanism 50 includes: a first drive mechanism 51 constituting the switching unit 38, a second drive mechanism 52 constituting the movement limiting unit 39, and a drive source 53 that outputs power to the first drive mechanism 51 and the second drive mechanism 52. The second drive mechanism 52 has a lever 39A that transmits power to the engaging parts 33A and 33B. The power is used to perform a locking action that locks the engaging parts 33A and 33B into an engaged state and a locking release action that releases the lock. The lever 39A extends along the side of the receiving box 32 in the depth direction Y1 according to each slot SL1, SL2.

[0056] Schematic structure of liquid ejection device

[0057] Next, refer to Figure 4 The general structure of the liquid ejection device 11 equipped with the liquid supply device 30 will be described below. It should be noted that... Figure 4 In this example, only one group of multiple liquid containments 41 and 42 containing the same type of liquid is depicted. In this case, there are two groups containing the same type of liquid.

[0058] Figure 4The first liquid containment body 41 and the second liquid containment body 42 shown contain the same type of liquid. Figure 4 Only one set is shown, but multiple sets of first liquid containment bodies 41 and second liquid containment bodies 42 each contain the same type of liquid. For example, if the liquid is ink, first liquid containment bodies 41 and second liquid containment bodies 42 are provided for each color: cyan, magenta, and yellow. In other words, as liquid containment bodies, there are first liquid containment bodies 41 and 42 for cyan liquid, first liquid containment bodies 41 and 42 for magenta liquid, and first liquid containment bodies 41 and 42 for yellow liquid (see reference). Figure 2 , Figure 3 The number of groups consisting of the first liquid containment body 41 and the second liquid containment body 42 is not limited to three groups; it can also be two groups or more than four groups. Alternatively, it may include groups consisting of the first liquid containment body 41 and the second liquid containment body 42 containing a black liquid.

[0059] A first liquid container 41 is inserted into a first slot SL1, and a second liquid container 42 is inserted into a second slot SL2. The liquid supply device 30 includes: a first sensor SE1, which detects that the first liquid container 41 is inserted into the first slot SL1; and a second sensor SE2, which detects that the second liquid container 42 is inserted into the second slot SL2. The control unit 25 determines whether the first liquid container 41 is inserted into the first slot SL1 based on the detection signal input from the first sensor SE1. Additionally, the control unit 25 determines whether the second liquid container 42 is inserted into the second slot SL2 based on the detection signal input from the second sensor SE2. It should be noted that the control unit 25 includes: a sensor that detects that the first engaging portion 33A is in an engaged state; and a sensor that detects that the second engaging portion 33B is in an engaged state (both omitted from the illustration). Based on the detection results from these sensors, the control unit 25 determines individually whether the first engaging part 33A and the second engaging part 33B are in an engaging state.

[0060] like Figure 4As shown, the liquid supply device 30 includes: a supply flow path 35 connected to a liquid nozzle 20; a first supply flow path 36 connecting a first liquid container 41 to the supply flow path 35; and a second supply flow path 37 connecting a second liquid container 42 to the supply flow path 35. Furthermore, the liquid supply device 30 includes the aforementioned switching unit 38 capable of switching between the first supply flow path 36 and the second supply flow path 37 connected to the supply flow path 35. Additionally, the liquid supply device 30 includes the aforementioned movement restriction unit 39, which selectively restricts the movement of the first liquid container 41 and the second liquid container 42 in conjunction with the switching of the switching unit 38.

[0061] The assembly part 31 includes: a first connecting part 31A, which connects to a first liquid container 41 inserted into a first slot SL1; and a second connecting part 31B, which connects to a second liquid container 42 inserted into a second slot SL2. The connecting parts 31A and 31B protrude in a needle-like shape from the depth surfaces within the slots SL1 and SL2. When the first liquid container 41 is inserted into the insertion position of the first slot SL1, the needle-like first connecting part 31A is inserted into the liquid supply port (not shown) on the front end face of the first liquid container 41 in the insertion direction ID. Thus, the first liquid container 41 communicates with the first supply flow path 36. Similarly, when the second liquid container 42 is inserted into the insertion position of the second slot SL2, the needle-like second connecting part 31B is inserted into the liquid supply port (not shown) on the front end face of the second liquid container 42 in the insertion direction ID. Thus, the second liquid container 42 communicates with the second supply flow path 37.

[0062] When the switching unit 38 connects the first supply flow path 36 to the supply flow path 35, the movement restriction unit 39 restricts the movement of the first liquid container 41. Additionally, when the switching unit 38 connects the second supply flow path 37 to the supply flow path 35, the movement restriction unit 39 restricts the movement of the second liquid container 42.

[0063] The switching unit 38 includes: a first on / off valve 54 for opening and closing the first supply flow path 36; a second on / off valve 55 for opening and closing the second supply flow path 37; and a first drive mechanism 51 for switching the opening and closing of the first on / off valve 54 and the second on / off valve 55. The switching unit 38 switches the flow path in the first supply flow path 36 and the second supply flow path 37 that is connected to the supply flow path 35. The control unit 25 stores usage information that identifies one of the users in the first liquid container 41 and the second liquid container 42 in a memory (storage unit) not shown. The control unit 25 opens the first on / off valve 54 and the second on / off valve 55 that is identified as the user based on the usage information, and closes the other one. When the liquid in one of the liquid containers 41 and 42 is depleted, if the other container contains a necessary amount of liquid, such as a new product, the liquid container 40 in use is switched to the other container by making that other container the user. It should be noted that the liquid containers 41 and 42 are equipped with storage elements (not shown) that store liquid information, including information related to the type and remaining quantity of the liquid contained. The control unit 25 obtains information about the type (e.g., ink color) and remaining quantity of the liquid contained in each liquid container 41 and 42 by reading the liquid information from the storage elements of each liquid container 41 and 42 inserted into slots SL1 and SL2.

[0064] When the switching unit 38 connects the first supply flow path 36 to the supply flow path 35, the first liquid container 41 and the liquid nozzle 20 are connected through the supply flow paths 35 and 36. Therefore, liquid is supplied to the liquid nozzle 20 from the first liquid container 41. When the switching unit 38 connects the second supply flow path 37 to the supply flow path 35, the second liquid container 42 and the liquid nozzle 20 are connected through the supply flow paths 35 and 37. Therefore, liquid is supplied to the liquid nozzle 20 from the second liquid container 42.

[0065] The control unit 25 controls the carriage 21 and the liquid ejector head 20. The control unit 25 drives the carriage 21 to reciprocate along the width direction X by controlling a carriage motor (not shown). The liquid ejector head 20 has multiple nozzles 20N capable of ejecting liquid supplied from either the first liquid container 41 or the second liquid container 42 during use. During the printing operation, the control unit 25 directs the liquid ejector head 20's nozzles 20N toward the medium 14 (see reference 14) midway through the movement of the carriage 21. Figure 1 (The liquid is sprayed out.)

[0066] Additionally, the control unit 25 controls the maintenance unit 22. The maintenance unit 22 includes a cap 22A. As a form of maintenance, the maintenance unit 22 performs cleaning to forcibly discharge liquid from the nozzle 20N of the liquid nozzle head 20. Cleaning can be performed using either a pressurized or negative pressure method. Negative pressure cleaning involves bringing the cap 22A into contact with the nozzle surface 20A of the opening of the nozzle 20N of the liquid nozzle head 20, thereby creating a negative pressure in the enclosed space formed between the nozzle surface 20A and the cap 22A by driving a suction pump (not shown). Liquid is forcibly discharged from the nozzle 20N under this negative pressure. Pressurized cleaning involves pressurizing the liquid contained in one of the first liquid container 41 and the second liquid container 42 using a pressurized pump, thereby forcibly discharging the liquid from the nozzle 20N of the liquid nozzle head 20. The liquid (waste liquid) discharged from the nozzle 20N during cleaning is collected in a waste liquid tank (not shown) via the cap 22A.

[0067] like Figure 4 As shown, the movement restriction unit 39 includes: a first engaging portion 33A capable of engaging with a first liquid container 41; a second engaging portion 33B capable of engaging with a second liquid container 42; and a second drive mechanism 52 for selectively switching the first engaging portion 33A and the second engaging portion 33B to a restricted state and an unrestricted state. The movement restriction unit 39 restricts the movement of the first liquid container 41 from the inserted state to the removal direction by locking the first engaging portion 33A in the engaged state with the first liquid container 41. Similarly, the movement restriction unit 39 restricts the movement of the second liquid container 42 from the inserted state to the removal direction by locking the second engaging portion 33B in the engaged state with the second liquid container 42.

[0068] In detail, the second drive mechanism 52 includes the aforementioned first locking mechanism 391 and second locking mechanism 392 (see reference). Figure 3 The first locking mechanism 391 locks the first liquid container 41 from the first slot SL1 by locking the first engaging portion 33A in an engaged state with the first liquid container 41. The second locking mechanism 392 locks the second liquid container 42 from the second slot SL2 by locking the second engaging portion 33B in an engaged state with the second liquid container 42.

[0069] When the amount of liquid in the liquid container of the first liquid container 41 and the second liquid container 42 whose movement is restricted by the movement restriction part 39 is lower than a predetermined threshold, the control unit 25 switches the flow path connected to the supply flow path 35. Therefore, the control unit 25 releases the restriction on the movement of the one of the first liquid container 41 and the second liquid container 42 whose movement is restricted by the movement restriction part 39 and restricts the movement of the other one.

[0070] That is, when the amount of liquid in the first liquid container 41, whose movement is restricted by the movement restriction unit 39, is lower than a predetermined threshold, the control unit 25 switches the flow path connected to the supply flow path 35. Therefore, the control unit 25 releases the restriction on the movement of the first liquid container 41 and restricts the movement of the second liquid container 42. On the other hand, when the amount of liquid in the second liquid container 42, whose movement is restricted by the movement restriction unit 39, is lower than a predetermined threshold, the control unit 25 switches the flow path connected to the supply flow path 35. Therefore, the control unit 25 releases the restriction on the movement of the second liquid container 42 and restricts the movement of the first liquid container 41.

[0071] Furthermore, when replacing the liquid container 41 or the liquid container 42 that is not restricted from movement by the movement restriction unit 39 with a new liquid container 40, the control unit 25 switches the flow path connected to the supply flow path 35. Therefore, the control unit 25 releases the restriction on the movement of the other liquid container 40 and restricts the movement of the new liquid container 40.

[0072] That is, when replacing the first liquid container 41, which is not restricted in movement by the movement restriction unit 39, with a new first liquid container 41, the control unit 25 switches the flow path connected to the supply flow path 35 from the second supply flow path 37 to the first supply flow path 36. Furthermore, the control unit 25 releases the restriction on the movement of the second liquid container 42 and restricts the movement of the new first liquid container 41. It should be noted that, alternatively, after replacing with a new first liquid container 41, if the remaining volume of the second liquid container 42 is below a threshold, the flow path connected to the supply flow path 35 is switched from the second supply flow path 37 to the first supply flow path 36, and the movement of the new first liquid container 41 is restricted.

[0073] Furthermore, when replacing the second liquid container 42, which is not restricted in its movement by the movement restriction unit 39, with a new liquid container 42, the control unit 25 switches the flow path connected to the supply flow path 35 from the first supply flow path 36 to the second supply flow path 37. Therefore, the control unit 25 releases the restriction on the movement of the first liquid container 41 and restricts the movement of the new second liquid container 42. It should be noted that, alternatively, after replacing with a new second liquid container 42, if the remaining volume of the first liquid container 41 is below a threshold, the flow path connected to the supply flow path 35 can be switched from the first supply flow path 36 to the second supply flow path 37, and the movement of the new second liquid container 42 can be restricted.

[0074] like Figure 4As shown, the liquid supply device 30 includes a drive source 53 that drives the first drive mechanism 51 and the second drive mechanism 52. The control unit 25 drives and controls the two on / off valves 54 and 55 constituting the switching unit 38 and the two locking mechanisms 391 and 392 constituting the movement limiting unit 39 by driving the drive source 53. The drive source 53 is, for example, an electric motor. It should be noted that the drive source 53 is not limited to an electric motor; for example, it can also be an electric cylinder or a solenoid.

[0075] like Figure 4 As shown, an operation panel 24 is electrically connected to the control unit 25. Additionally, the liquid dispensing device 11 includes a communication unit 26 for communicative connection to the main unit 80. The control unit 25 is communicatively connected to the main unit 80 via the communication unit 26. The user can issue commands to the liquid dispensing device 11 by operating the operation panel 24. Furthermore, the user can issue commands to the liquid dispensing device 11 by operating the input section of the main unit 80. These commands include commands instructing actions to consume liquid, i.e., liquid consumption actions.

[0076] The commands for liquid consumption operations include printing commands and maintenance commands. The printing command commands the printing operation that prints onto the medium 14 by ejecting liquid such as ink from the liquid nozzle 20 toward the medium 14. The maintenance command commands the cleaning of the nozzle 20N by forcibly discharging liquid from the nozzle. The maintenance command cleans the nozzle 20N by discharging the thickened liquid, air bubbles, and other liquid particles from the nozzle 20N.

[0077] When the control unit 25 receives a printing command from the operation panel 24 or the main unit 80, it executes the printing action of controlling the liquid nozzle 20 and the delivery unit 23 to print images or text on the medium 14.

[0078] In addition, the control unit 25 manages the maintenance execution period. The control unit 25 manages the elapsed time since the last maintenance and the number of prints since the last maintenance. If the elapsed time exceeds a time threshold, the control unit 25 executes the maintenance action performed by the maintenance unit 22. Similarly, if the number of prints exceeds a quantity threshold, the control unit 25 executes the maintenance action performed by the maintenance unit 22. Furthermore, the control unit 25 executes the maintenance action of the maintenance unit 22 when it receives a maintenance command from the operation panel 24 or the main unit 80. It should be noted that the maintenance action can be any action other than cleaning. For example, the maintenance action can also be an empty spray (rinsing) of liquid from the nozzle 20N of the liquid spray head 20.

[0079] The control unit 25, which controls the operation of the liquid dispensing device 11, is configured to include, for example, a CPU and a memory. The control unit 25 controls structural elements of the liquid dispensing device 11, such as the liquid nozzle 20, the liquid supply device 30, the maintenance unit 22, and the delivery unit 23, by executing a program stored in the memory via the CPU. In this example, the control unit 25 includes, for example, a CPU... Figure 12 The program shown in the flowchart is stored in memory.

[0080] The structure of supply organization 50

[0081] Next, refer to Figures 5-8 The structure of supply organization 50 is explained.

[0082] like Figure 5 As shown, the supply mechanism 50 includes a drive source 53, a first drive mechanism 51 driven by power output from the drive source 53, and a second drive mechanism 52, respectively. Specifically, the supply mechanism 50 includes a drive source 53, a gear train 58 that transmits torque output from the drive source 53, and multiple cams 61-64 that rotate based on the torque transmitted by the gear train 58. The multiple cams 61-64 are rotatably supported and fixed to a common shaft 65. The multiple cams 61-64 are fixed with a predetermined phase difference relative to the shaft 65 and rotate integrally with the shaft 65. The gear train 58 includes an input gear 56 fixed to the output shaft of the drive source 53 and an output gear 57 located at the downstream end of the power transmission path.

[0083] The first drive mechanism 51 includes: a first cam 61, which is mounted on a shaft 65 that rotates in conjunction with the drive source 53 and is capable of switching the opening and closing of the first on / off valve 54; and a second cam 62, which is mounted on the shaft 65 and is capable of switching the opening and closing of the second on / off valve 55.

[0084] The second drive mechanism 52 has a third cam 63, which is mounted on the shaft 65 and is capable of switching the first engagement part 33A (see reference). Figure 3 , Figure 8 The state of the second engagement part 33B; and the fourth cam 64, which is mounted on the shaft 65 and is capable of switching the second engagement part 33B (see reference). Figure 3 , Figure 8 ) state.

[0085] Figure 5 The output gear 57 shown meshes with the gear section 66, which is configured to rotate integrally with the third cam 63 and the fourth cam 64. Therefore, the shaft section 65 is rotated by the power from the drive source 53 via the gear train 58, thereby causing the first cam 61, the second cam 62, the third cam 63, and the fourth cam 64 fixed to the shaft section 65 to rotate integrally.

[0086] like Figure 6 As shown, the first cam 61 and the second cam 62 each have cam surfaces 61A and 62A formed on their outer peripheries. Each cam surface 61A and 62A engages with the sliding surface 71A of the first lever 71 corresponding to the first cam 61 and the second cam 62, respectively. The first lever 71 is, for example, roughly L-shaped when viewed from the side, and can rotate within a predetermined angle range about the support shaft 72. The first cam 61 engages with the sliding surface 71A of the first lever 71, thereby switching the opening and closing of the first on / off valve 54 via the rotation of the first cam 61. The second cam 62 engages with a first lever 71 different from the first lever 71 engaged with the first cam 61, thereby switching the opening and closing of the second on / off valve 55 via the rotation of the second cam 62.

[0087] At the opposite end of each of the first levers 71 to the end where the sliding surface 71A is located, a drive shaft 73 is connected to switch the opening and closing of the first on / off valve 54 and the second on / off valve 55, respectively. By driving the drive shaft 73 axially, the opening and closing of each on / off valve 54 and 55 can be switched individually. It should be noted that the relationship between the rotational positions of the first cam 61 and the second cam 62 and the opening and closing states of the on / off valves 54 and 55 will be described later.

[0088] In addition, such as Figure 5 , Figure 6 As shown, the third cam 63 and the fourth cam 64 each have cam surfaces 63A and 64A formed on their outer peripheries. Each cam surface 63A and 64A has a sliding surface 75A of the second lever 75 corresponding to the third cam 63 and the fourth cam 64, respectively (see reference). Figure 6 ) card combination. For example Figure 6 As shown, the second lever 75 is approximately L-shaped when viewed from the side and is capable of rotating within a predetermined angular range around the support shaft 76. The third cam 63 engages with the sliding surface 75A of the second lever 75, thereby causing the rod 39A to be axially displaced by the rotation of the third cam 63. The fourth cam 64 engages with a second lever 75, which is different from the second lever 75 engaged with the third cam 63, thereby causing the rod 39A to be axially displaced by the rotation of the fourth cam 64.

[0089] The base end of rod 39A is connected to the other end of each of the second levers 75 on the opposite side of the end where the sliding surface 75A is located. Rod 39A is displaced axially, thereby engaging the locking parts 33A and 33B (see reference). Figure 8 The system switches between a restricted state (locked state) that restricts the movement of the liquid container 40 and an unrestricted state (locked-out state) that does not restrict the movement of the liquid container 40. It should be noted that the relationship between the rotational positions of the third cam 63 and the fourth cam 64 and the states of the engaging parts 33A and 33B will be described later.

[0090] like Figure 7 As shown, the supply mechanism 50 includes: a first supply flow path 36 connected to the first on / off valve 54; a second supply flow path 37 connected to the second on / off valve 55; and a supply flow path 35 that connects the first supply flow path 36 and the second supply flow path 37 in a common manner. Figure 7 Although omitted, the section supplying other types of liquids also includes a first supply flow path 36 connected to the first on / off valve 54, a second supply flow path 37 connected to the second on / off valve 55, and a supply flow path 35. The multiple supply flow paths 35 are respectively connected to pipes (not shown) or other pipelines (see reference). Figure 1 Different types of liquids are supplied to the liquid nozzle 20. It should be noted that, for example... Figure 7 As shown, the movement restriction unit 39 is composed of a first locking mechanism 391 that restricts the movement of the first liquid container 41 inserted into the first slot SL1 and a second locking mechanism 392 that restricts the movement of the second liquid container 42 inserted into the second slot SL2.

[0091] like Figure 8 As shown, a force-applying component 39S, such as a spring, is provided at the front end of the rod 39A to apply force to the rod 39A. Here, Figure 8 In the middle, the upper first locking mechanism 391 is in a restricted state, and the lower second locking mechanism 392 is in an unrestricted state (restriction released state).

[0092] Rod 39A is subjected to the force of the force-applying component 39S, as Figure 8 The lever 39A is positioned in a restricted position as shown in the first locking mechanism 391 on the upper side. In this restricted position, the front end 39B of the lever 39A engages with the restricting portion 33C extending from the engaging portion 33. By restricting the movement of the restricting portion 33C by the lever 39A, the operation of moving the engaging portion 33 from the engaged state to the unengaged state is restricted. That is, the user is restricted from moving the operating unit 34 from the engaged state (where the liquid container 40 cannot be removed) to the unengaged state (where the liquid container 40 can be removed). Therefore, the user cannot remove the liquid container 40.

[0093] If the second cam 62 or the fourth cam 64 presses down on the second lever 75, then the lever 39A overcomes the force exerted by the force-applying member 39S and... Figure 8The second locking mechanism 392 shown on the lower side is configured in the restriction-released position. In this restriction-released position, the front end 39B of the lever 39A retracts to a position where it does not engage with the restricting portion 33C extending from the engaging portion 33. Since the lever 39A does not restrict the movement of the restricting portion 33C, the user can move the engaging portion 33 from an engaged state to a non-engaged state (operation). That is, the user moves the operating unit 34 from an engaged state where the liquid container 40 cannot be removed to a non-engaged state where the liquid container 40 can be removed, thereby enabling the removal of the liquid container 40.

[0094] The state of the opening / closing valve and the locking mechanism

[0095] Reference Figure 9 The three states that can be used in the switching combination of the opening and closing valves 54 and 55 and the locking mechanisms 391 and 392 are explained.

[0096] like Figure 9 As shown, the first on / off valve 54 switches the opening and closing of the first supply flow path 36, which is connected to the first liquid container 41 in the first slot SL1. The second on / off valve 55 switches the opening and closing of the second supply flow path 37, which is connected to the second liquid container 42 in the second slot SL2. Furthermore, the first locking mechanism 391 switches between a locked state that restricts movement of the first liquid container 41 in the first slot SL1 and a unlocked state that does not restrict such movement. The second locking mechanism 392 switches between a locked state that restricts movement of the second liquid container 42 in the second slot SL2 and a unlocked state that does not restrict such movement.

[0097] like Figure 9 As shown, the system switches between three states: "State 1," "State 2," and "State 3," through the combination of switching opening and closing valves 54 and 55 with locking mechanisms 391 and 392. In "State 1," the first opening and closing valve 54 is open, the second opening and closing valve is closed, the first locking mechanism 391 is locked, and the second locking mechanism 392 is unlocked. In "State 2," the first opening and closing valve 54 is closed, the second opening and closing valve is closed, the first locking mechanism 391 is unlocked, and the second locking mechanism 392 is unlocked. In "State 3," the first opening and closing valve 54 is closed, the second opening and closing valve is open, the first locking mechanism 391 is unlocked, and the second locking mechanism 392 is locked.

[0098] Figure 10 This indicates the state changes of the various opening and closing valves 54 and 55 and locking mechanisms 391 and 392 involved in slot 1 SL1 and slot 2 SL2. Through the switching control of opening and closing valves 54 and 55 and the switching control of locking mechanisms 391 and 392, the state changes to any one of state 1, state 2, and state 3. Figure 10In the diagram, the horizontal axis represents the rotation angle of the shaft 65, on which cams 61 to 64 are fixed. The shaft 65 is driven and controlled by the drive source 53 via the control unit 25, thereby reciprocating within a range of 180 degrees from -90 degrees to 90 degrees.

[0099] When the rotation angle of the shaft 65 is within the first angle range including -90 degrees, "State 1" is adopted. When the rotation angle of the shaft 65 is within the second angle range including 0 degrees, "State 2" is adopted. And, when the rotation angle of the shaft 65 is within the third angle range including 90 degrees, "State 3" is adopted.

[0100] In "State 1", the first opening and closing valve 54 of the first slot SL1 is in the open state, the first locking mechanism 391 of the first slot SL1 is in the locked state, the second opening and closing valve 55 of the second slot SL2 is in the closed state, and the second locking mechanism 392 of the second slot SL2 is in the unlocked state.

[0101] In "State 2", the first opening and closing valve 54 of the first slot SL1 is closed, the first locking mechanism 391 of the first slot SL1 is unlocked, the second opening and closing valve 55 of the second slot SL2 is closed, and the second locking mechanism 392 of the second slot SL2 is unlocked.

[0102] In "State 3", the first opening and closing valve 54 of the first slot SL1 is closed, the first locking mechanism 391 of the first slot SL1 is unlocked, the second opening and closing valve 55 of the second slot SL2 is open, and the second locking mechanism 392 of the second slot SL2 is locked.

[0103] In this embodiment, the control unit 25 controls the drive source 53 to perform... Figure 10 The state switching is shown. In detail, the control unit 25 switches the state by controlling the rotation angle of the aforementioned first cam 61, second cam 62, third cam 63 and fourth cam 64.

[0104] Next, refer to Figure 11 The relationship between the rotation angles of the four cams 61 to 64 and the three states is explained. Figure 11 It is a coordinate graph showing the relationship between the rotation angles of the four cams 61 to 64 in the two slots SL1 and SL2 and the changing states of the opening and closing valves 54 and 55 and the locking mechanisms 391 and 392.

[0105] like Figure 11As shown, the first cam 61 is an eccentric cam with a cam surface 61A on its outer periphery. The second cam 62 is an eccentric cam with a cam surface 62A on its outer periphery. For example, the first cam 61 and the second cam 62 are of the same size and shape. The first cam 61 and the second cam 62 are offset from each other by approximately 180 degrees. Furthermore, the third cam 63 is an eccentric cam with a cam surface 63A on its outer periphery. The fourth cam 64 is an eccentric cam with a cam surface 64A on its outer periphery. For example, the third cam 63 and the fourth cam 64 are of the same size and shape. The third cam 63 and the fourth cam 64 are offset from each other by approximately 90 degrees.

[0106] Therefore, in "State 1", the first opening / closing valve 54 is opened by pressing the first lever 71 with the first cam 61, and the second opening / closing valve 55 is not closed by pressing the first lever 71 with the second cam 62. Moreover, in "State 1", the first locking mechanism 391 is not locked by pressing the second lever 75 with the third cam 63, and the second locking mechanism 392 is released by pressing the second lever 75 with the fourth cam 64.

[0107] Furthermore, in "State 2", the first opening / closing valve 54 is not closed by pressing the first lever 71 with the first cam 61, and the second opening / closing valve 55 is not closed by pressing the first lever 71 with the second cam 62. Moreover, in "State 2", the first locking mechanism 391 is released by pressing the second lever 75 with the third cam 63, and the second locking mechanism 392 is released by pressing the second lever 75 with the fourth cam 64.

[0108] Furthermore, in "State 3", the first opening / closing valve 54 is not closed by pressing the first lever 71 with the first cam 61, and the second opening / closing valve 55 is opened by pressing the first lever 71 with the second cam 62. Moreover, in "State 3", the first locking mechanism 391 is released by pressing the second lever 75 with the third cam 63, and the second locking mechanism 392 is not locked by pressing the second lever 75 with the fourth cam 64.

[0109] The role of the implementation method

[0110] Next, the functions of the liquid ejection device 11 and the liquid supply device 30 will be explained.

[0111] The following is for reference Figures 1-12An example of the liquid supply control processing performed by the control unit 25 will be described. In this embodiment, the control unit 25 performs liquid supply control processing for the liquid supply device 30. This liquid supply control processing includes controlling the printing operation of printing images or text on the medium 14 and the maintenance operation of forcibly discharging liquid from the liquid nozzle 20. The user commands the printing operation by operating the operation panel 24 or the input section of the main unit 80. Additionally, the user commands the maintenance operation of the liquid nozzle 20 by operating the operation panel 24 or the input section of the main unit 80. The maintenance operation includes a cleaning operation. Furthermore, the control unit 25 has a management unit that manages the elapsed time or the number of prints since the last maintenance, and receives a maintenance operation command from the management unit when either the elapsed time or the number of prints exceeds its respective threshold.

[0112] The following is for reference Figure 12 The liquid supply control process performed by the control unit 25 will be explained.

[0113] In step S11, the control unit 25 determines whether a command for a liquid consumption operation exists. Here, a liquid consumption operation is the operation in which the liquid ejector head 20 consumes liquid (e.g., ink). In this example, liquid consumption operations include printing and maintenance operations. Here, the control unit 25 determines whether a command for a printing operation or a command for a maintenance operation exists. If a command for a liquid consumption operation exists, the process proceeds to step S12; otherwise, it waits until such a command exists.

[0114] In step S12, the control unit 25 opens only the valve corresponding to the liquid container to which the user is located. The control unit 25 acquires the remaining amount and usage information for all liquid containers 40. Usage information is used to identify whether a liquid container 40 is in use (the user). If the liquid in one of the first liquid containers 41 and the second liquid container 42 that is in use runs out (e.g., ink runs out), a new product from the other container is started, and usage information is generated indicating that the new product from the other container that has started use is in use. It should be noted that the time point at which the user container in the first liquid container 41 and the second liquid container 42 is switched to the new product can be appropriately set. This switching time point is not limited to when the liquid runs out (e.g., ink runs out); it can also be when the liquid is almost gone, or at other times when a predetermined remaining amount has been reached.

[0115] In step S12, for example, if the first liquid container 41 is the target of use, the control unit 25 opens only the first on / off valve 54 corresponding to the first liquid container 41. At this time, the second on / off valve 55 remains closed. Conversely, if the second liquid container 42 is the target of use, the control unit 25 opens only the second on / off valve 55 corresponding to the second liquid container 42. At this time, the first on / off valve 54 remains closed.

[0116] In step S13, the control unit 25 restricts the movement of the liquid container to be used. The control unit 25 restricts the movement of the liquid container 41 (determined to be used) from the first liquid container 41 and the second liquid container 42 by controlling the movement restriction unit 39. In other words, when the liquid container 41 is the object of use, the control unit 25 restricts only the movement of the first liquid container 41 by locking the first locking mechanism 391 and releasing the second locking mechanism 392. On the other hand, when the liquid container 42 is the object of use, the control unit 25 restricts only the movement of the second liquid container 42 by releasing the first locking mechanism 391 and locking the second locking mechanism 392. Thus, the movement of the liquid container 40 connected to the supply flow path 35 is restricted by the movement restriction unit 39. It should be noted that the processing in step S13 is equivalent to "restricting the movement of the liquid container 40 connected to the supply flow path 35 by the movement restriction unit 39".

[0117] In this embodiment, the control unit 25 controls the drive source 53 to make the four cams 61-64 either "state 1" or "state 3" (both referring to the state 1). Figure 10 , Figure 11 The system executes steps S12 and S13. Specifically, when the first liquid container 41 is in use, the four cams 61-64 are set to "State 1". In "State 1", the first opening / closing valve 54 is open, and the second opening / closing valve 55 is closed. Additionally, in "State 1", the first locking mechanism 391 is locked, and the second locking mechanism 392 is unlocked. Therefore, during the liquid consumption operation, the user cannot move the first operating unit 34A from the engaged state to the disengaged state. Therefore, the first liquid container 41 in use cannot be removed during the liquid consumption operation. On the other hand, the second liquid container 42, which is not in use, can be removed during the liquid consumption operation.

[0118] On the other hand, when the second liquid container 42 is in use, the four cams 61-64 are in "State 3". In "State 3", the first opening / closing valve 54 is closed, and the second opening / closing valve 55 is open. Additionally, in "State 3", the first locking mechanism 391 is in the unlocked state, and the second locking mechanism 392 is in the locked state. Therefore, during the liquid consumption operation, the user cannot move the second operating unit 34B from the engaged state to the unengaged state. Therefore, the second liquid container 42 in use cannot be removed during the liquid consumption operation. On the other hand, the first liquid container 41, which is not in use, can be removed during the liquid consumption operation.

[0119] In step S14, the control unit 25 executes a liquid consumption operation. This liquid consumption operation includes both a printing operation and a maintenance operation. If the command for the liquid consumption operation is a printing command, the control unit 25 executes the printing operation. Conversely, if the command for the liquid consumption operation is a maintenance command, the control unit 25 executes the maintenance operation. If the liquid consumption operation ends, the control unit 25 proceeds to step S15. It should be noted that the processing in step S14 is equivalent to "executing the liquid consumption operation".

[0120] During the execution of this liquid consumption operation, if the first liquid container 41 is in use, the user cannot operate the first operating unit 34A corresponding to the first liquid container 41 to the unengaged state. On the other hand, during the execution of the liquid consumption operation, if the second liquid container 42 is in use, the user cannot operate the second operating unit 34B corresponding to the second liquid container 42 to the unengaged state. As a result, printing failures or maintenance failures caused by removing the liquid container 40 in use during printing or maintenance operations can be prevented.

[0121] In step S15, the control unit 25 closes the first on / off valve 54 and the second on / off valve 55. That is, the control unit 25 controls the switching unit 38 to make the first supply flow path 36 and the second supply flow path 37 together disconnected from the supply flow path 35. Specifically, the control unit 25 controls the drive source 53 to make the first cam 61 and the second cam 62 "state 2" (see reference). Figure 10 , Figure 11This closes both the first on / off valve 54 and the second on / off valve 55. Therefore, when the liquid consumption operation is not performed, the first supply flow path 36, which is connected to the first liquid container 41, is closed, and the second supply flow path 37, which is connected to the second liquid container 42, is closed. Thus, both the first supply flow path 36 and the second supply flow path 37 are in a state where they are not connected to the supply flow path 35. It should be noted that the processing in step S15 is equivalent to "after performing the liquid consumption operation, the first supply flow path 36 and the second supply flow path 37 are in a state where they are not connected to the supply flow path 35 via the switching unit 38."

[0122] In step S16, the control unit 25 releases the restrictions on the two liquid containers 41 and 42. That is, the control unit 25 controls the movement restriction unit 39, and the first liquid container 41 and the second liquid container 42 are released from their movement restrictions together. Specifically, the control unit 25 controls the drive source 53 to make the third cam 63 and the fourth cam 64 "state 2" (see reference). Figure 10 , Figure 11 This causes the first locking mechanism 391 and the second locking mechanism 392 to be in a locked-out state, preventing the engaging parts 33A and 33B from being locked in the engaged state. Therefore, when the liquid consumption operation is not performed, the user can remove either the first liquid container 41 or the second liquid container 42 by operating the operation unit 34. Thus, in the absence of liquid consumption operation that would not result in printing failure or maintenance failure, the user can remove either the first liquid container 41 or the second liquid container 42. It should be noted that the processing in step S16 is equivalent to "after the operation is performed, the movement restriction unit 39 releases the movement restriction of both the first liquid container 41 and the second liquid container 42".

[0123] In this embodiment, the control unit 25 controls the drive source 53 to make the four cams 61-64 enter "state 2" (see reference). Figure 10 , Figure 11 This allows the execution of steps S15 and S16. In "State 2", both the first opening / closing valve 54 and the second opening / closing valve 55 are closed, and both the first locking mechanism 391 and the second locking mechanism 392 are in the unlocked state. Therefore, when the liquid consumption operation is not performed, the user can remove either the first liquid container 41 or the second liquid container 42 by operating the operation unit 34.

[0124] In the first embodiment, the control unit 25 performs liquid supply control processing to execute a control method including the following steps 1 to 3.

[0125] Step 1

[0126] When a command to consume liquid is issued (a command for liquid consumption), the following is performed. The switching unit 38 connects either the first supply flow path 36 or the second supply flow path 37 to the supply flow path 35. Therefore, the movement of the liquid container 40 on the side connected to the supply flow path 35 is restricted by the movement limiting unit 39. This first step is equivalent to... Figure 12 The processing of steps S12 and S13 in the process.

[0127] Step 2

[0128] Perform the action of consuming liquid. In other words, the liquid nozzle 20 performs the liquid consumption action. This second step is equivalent to... Figure 12 The processing of step S14.

[0129] Step 3

[0130] After the liquid consumption action is performed, the first supply flow path 36 and the second supply flow path 37 are disconnected from the supply flow path 35 via the switching unit 38, and the movement restriction unit 39 releases the movement restriction on the first liquid container 41 and the second liquid container 42. This third step is equivalent to... Figure 12 The processing of steps S15 and S16.

[0131] Therefore, it is possible to prevent printing interruptions caused by the user removing the liquid container 40 during the printing process by operating the operating unit 34. Thus, it is possible to prevent waste of the medium 14 due to printing interruptions and waste of ink or other liquids due to reprinting.

[0132] Furthermore, it can prevent maintenance interruptions caused by the user removing the liquid container 40 during maintenance operations by manipulating the operating unit 34. Therefore, it can prevent the waste of ink and other liquids due to reprinting caused by maintenance interruptions.

[0133] Furthermore, in this embodiment, the removal of the liquid container 40 in use is mechanically locked during the printing and maintenance operations. For example, the firmware could be configured to handle errors that occur during the printing or maintenance operation when an error occurs in removing the liquid container 40 in use. However, in this case, the firmware needs to be configured to handle all assumed errors, thus increasing firmware complexity and potentially leading to omissions in error handling. By adopting a structure that mechanically locks the liquid container 40 in use in a way that prevents it from being removed, as in this embodiment, firmware complexity and omissions in error handling can be avoided. Therefore, firmware complexity can be prevented, and the occurrence of errors in removing the liquid container 40 in use can be prevented.

[0134] As detailed above, the following effects are obtained according to this embodiment.

[0135] (1-1) The liquid supply device 30 includes: a supply flow path 35 connected to a liquid nozzle 20 capable of ejecting liquid; a first supply flow path 36 connecting a first liquid container 41 containing liquid to the supply flow path 35; and a second supply flow path 37 connecting a second liquid container 42 to the supply flow path 35, wherein the second liquid container 42 contains a liquid of the same type as the liquid contained in the first liquid container 41. The liquid supply device 30 includes: a switching unit 38 capable of switching between the first supply flow path 36 and the second supply flow path 37 connected to the supply flow path 35; and a movement limiting unit 39 capable of selectively limiting the movement of the first liquid container 41 and the second liquid container 42 in conjunction with the switching of the switching unit 38. According to this structure, the movement of the liquid container 40 connected to the liquid nozzle 20 can be restricted, while the movement of the liquid container 40 not connected to the liquid nozzle 20 can be unrestricted. Therefore, it is possible to prevent the liquid container 40 in use from being mistakenly removed.

[0136] (1-2) When the switching unit 38 connects the first supply flow path 36 to the supply flow path 35, the movement restriction unit 39 restricts the movement of the first liquid container 41. When the switching unit 38 connects the second supply flow path 37 to the supply flow path 35, the movement restriction unit 39 restricts the movement of the second liquid container 42. According to this structure, it is possible to prevent the situation where the liquid container 40 in use is mistakenly removed.

[0137] (1-3) The switching unit 38 includes: a first on / off valve 54, which opens and closes a first supply flow path 36; a second on / off valve 55, which opens and closes a second supply flow path 37; and a first drive mechanism 51, which is used to switch the opening and closing of the first on / off valve 54 and the second on / off valve 55. The movement restriction unit 39 includes: a first engaging part 33A, which can engage with a first liquid container 41; a second engaging part 33B, which can engage with a second liquid container 42; and a second drive mechanism 52, which can selectively switch between a restricted movement state and an unrestricted movement state relative to the first engaging part 33A and the second engaging part 33B, respectively.

[0138] The liquid supply device 30 includes a drive source 53 that drives the first drive mechanism 51 and the second drive mechanism 52. With this structure, the opening and closing of the valves 54 and 55, as well as the switching between the restricted and unrestricted states of the engaging parts 33A and 33B, can be performed using a single drive source 53. Therefore, the structure of the liquid supply device 30 can be simplified.

[0139] (1-4) The first engaging part 33A has a first operating part 34A that allows the user to release the engagement state with the first liquid container 41. The second engaging part 33B has a second operating part 34B that allows the user to release the engagement state with the second liquid container 42. The second drive mechanism 52 can selectively switch between a restricted state that restricts the release of the engagement state and an unrestricted state that does not restrict the release of the engagement state for the first operating part 34A and the second operating part 34B, respectively.

[0140] According to this structure, when the first liquid container 41 is in use, the first operating part 34A is restricted, and when the second liquid container 42 is in use, the second operating part 34B is restricted. When the restriction of the operating part 34 is released, the user can operate the operating part 34 to release the locking of the liquid container 40 when he / she wants to remove the liquid container 40.

[0141] (1-5) The switching unit 38 includes: a first on / off valve 54 that opens and closes a first supply flow path 36; a second on / off valve 55 that opens and closes a second supply flow path 37; and a first drive mechanism 51 for switching the opening and closing of the first on / off valve 54 and the second on / off valve 55. Additionally, the movement limiting unit 39 includes: a first engaging portion 33A that can engage with a first liquid container 41; a second engaging portion 33B that can engage with a second liquid container 42; and a second drive mechanism 52 that can selectively switch between an engaged state and an unengaged state for the first engaging portion 33A and the second engaging portion 33B, respectively. The liquid supply device 30 includes: a drive source 53 that drives the first drive mechanism 51 and the second drive mechanism 52. According to this structure, the opening and closing of the first on / off valve 54 and the second on / off valve 55, as well as the engagement and disengagement states of the first engaging portion 33A and the second engaging portion 33B with the liquid container 40, can be switched using a single drive source 53. Therefore, the structure of the liquid supply device 30 can be simplified.

[0142] (1-6) The first drive mechanism 51 includes: a first cam 61 mounted on a shaft 65 that rotates in conjunction with the drive source 53 and is capable of switching the opening and closing of the first on / off valve 54; and a second cam 62 mounted on the shaft 65 and capable of switching the opening and closing of the second on / off valve 55. The second drive mechanism 52 includes: a third cam 63 mounted on the shaft 65 and capable of switching the state of the first engagement part 33A; and a fourth cam 64 mounted on the shaft 65 and capable of switching the state of the second engagement part 33B. According to this structure, the switching of the first on / off valve 54, the second on / off valve 55, the first engagement part 33A, and the second engagement part 33B can be achieved simply by rotating the shaft 65 on which the first cam 61, the second cam 62, the third cam 63, and the fourth cam 64 are commonly mounted. Therefore, the structure of the liquid supply device 30 can be simplified.

[0143] (1-7) Includes: a liquid ejector head 20 capable of ejecting liquid; a liquid supply device 30; and a control unit 25, which includes a control switching unit 38 and a movement limiting unit 39. According to this structure, the liquid ejector device 11 achieves the same effect as the liquid supply device.

[0144] (1-8) When the amount of liquid in the liquid container 40 whose movement is restricted by the movement restriction unit 39 is lower than a predetermined threshold, the control unit 25 switches the flow path connected to the supply flow path 35, and releases the restriction on the movement of one liquid container 40 while restricting the movement of the other liquid container 40. According to this structure, if the amount of liquid in the liquid container 40 in use is lower than the predetermined threshold, the liquid container 40 connected to the liquid nozzle 20 can be automatically switched from the one currently in use to the other liquid container 40. Thus, the use of liquid containers 40 with low liquid levels can be suppressed, and the liquid consumption operation can continue uninterrupted even if the amount of liquid in the liquid container 40 in use decreases.

[0145] (1-9) When a liquid container 40 whose movement is not restricted by the movement restriction unit 39 is replaced with a new liquid container 40, the control unit 25 switches the flow path connected to the supply flow path 35. Therefore, the restriction on the movement of the other liquid container 40 is lifted, while the movement of the new liquid container 40 is restricted. With this structure, it is possible to always start using the liquid from the new liquid container 40. Therefore, the liquid consumption operation can continue uninterrupted.

[0146] (1-10) A control method for a liquid ejection device 11, the liquid ejection device 11 comprising a liquid ejection head 20, a supply flow path 35, a first supply flow path 36, a second supply flow path 37, a switching unit 38, and a movement limiting unit 39. The control method includes the following first step, second step, and third step. In the first step, when a command to consume liquid is received, the switching unit 38 connects either the first supply flow path 36 or the second supply flow path 37 to the supply flow path 35, and the movement limiting unit 39 restricts the movement of the liquid container 40 on the side connected to the supply flow path 35 (steps S12, S13). In the second step, the liquid consumption operation is performed (step S14). In step 3, after the action is performed, the first supply flow path 36 and the second supply flow path 37 are disconnected from the supply flow path 35 via the switching unit 38, and the movement restriction unit 39 releases the movement restriction on the first liquid container 41 and the second liquid container 42 (steps S15 and S16). According to this control method, it is possible to prevent the liquid container 40 from being mistakenly removed during the liquid consumption operation.

[0147] (Second Implementation)

[0148] In the first embodiment described above, movement of one of the first liquid containment body 41 and the second liquid containment body 42 during use is restricted during liquid consumption, but in this second embodiment, it is restricted during power-on of the liquid ejection device 11.

[0149] The user connects the liquid dispensing device 11 to the power supply via the power operation unit (not shown) on the operation panel 24. When the liquid dispensing device 11 is connected to the power supply, the control unit 25 is activated. Once activated, the control unit 25 executes... Figure 13 The program is shown in the flowchart.

[0150] The following is for reference Figure 13 The liquid supply control process performed by the control unit 25 is explained.

[0151] First, in step S21, the control unit 25 determines whether a power source is connected. If a power source is connected, the process proceeds to step S22.

[0152] In steps S22 and S23, the control unit 25 performs the same processing as steps S12 and S13 in the first embodiment.

[0153] In step S22, the control unit 25 opens only the valve corresponding to the liquid container to which the user is located. The control unit 25 determines the liquid container 40 to which the user is located (in use) by acquiring the remaining quantity and usage information for all liquid containers 40. Furthermore, the control unit 25 opens only the valve corresponding to the one of the first liquid container 41 and the second liquid container 42 that is determined to be the user. For example, if the first liquid container 41 is the user, the control unit 25 opens only the first valve 54. At this time, the second valve 55 remains closed. On the other hand, if the second liquid container 42 is the user, the control unit 25 opens only the second valve 55. At this time, the first valve 54 remains closed.

[0154] In step S23, the control unit 25 restricts the movement of the liquid container to be used. The control unit 25 restricts the movement of the one determined to be the user, either the first liquid container 41 or the second liquid container 42, by controlling the movement restriction unit 39. In other words, when the user is the first liquid container 41, the control unit 25 restricts the movement of only the first liquid container 41 by locking the first locking mechanism 391 and unlocking the second locking mechanism 392. Conversely, when the user is the second liquid container 42, the control unit unlocks the first locking mechanism 391 and locks the second locking mechanism 392, thereby restricting the movement of only the second liquid container 42.

[0155] In this embodiment, the control unit 25 controls the drive source 53 to make the four cams 61-64 either "state 1" or "state 3" (both referring to...). Figure 10 , Figure 11 This process executes steps S22 and S23. It should be noted that the processes of steps S22 and S23 are equivalent to "when the power is connected, by switching unit 38, either the first supply flow path 36 or the second supply flow path 37 is connected to the supply flow path 35, and by moving restricting unit 39, the movement of the liquid container on the side connected to the supply flow path 35 is restricted".

[0156] In the next step S24, the control unit 25 determines whether there is a power-off command. If there is a power-off command, the process proceeds to step S25.

[0157] In steps S25 and S26, the control unit 25 performs the same processing as steps S15 and S16 in the first embodiment.

[0158] In step S25, the control unit 25 closes the first on / off valve 54 and the second on / off valve 55. That is, the control unit 25 controls the switching unit 38 to make the first supply flow path 36 and the second supply flow path 37 together disconnected from the supply flow path 35. Specifically, the control unit 25 controls the drive source 53 to make the first cam 61 and the second cam 62 "state 2" (see reference). Figure 10 , Figure 11 This closes both the first on / off valve 54 and the second on / off valve 55. Therefore, with the power disconnected, the first supply path 36, connected to the first liquid container 41, is closed, and the second supply path 37, connected to the second liquid container 42, is closed. Thus, both the first supply path 36 and the second supply path 37 are no longer connected to the supply path 35.

[0159] In step S26, the control unit 25 releases the restrictions on the two liquid containers 41 and 42. That is, the control unit 25 controls the movement restriction unit 39, releasing the movement restrictions on both the first liquid container 41 and the second liquid container 42. Specifically, the control unit 25 controls the drive source 53 to put the third cam 63 and the fourth cam 64 into "state 2" (see reference). Figure 10 , Figure 11 This releases the lock, causing both the first locking mechanism 391 and the second locking mechanism 392 to be in a unlocked state where the engaging parts 33A and 33B are not locked in the engaged state. Therefore, with the power off, the user can remove either the first liquid container 41 or the second liquid container 42 by operating the operation unit 34. Thus, even with the power off in a power-off state where there is no printing failure or maintenance failure, the user can remove either the first liquid container 41 or the second liquid container 42.

[0160] It should be noted that the processing of steps S25 and S26 is equivalent to "when there is a power cut-off command, the first supply flow path 36 and the second supply flow path 37 become disconnected from the supply flow path 35 through the switching unit 38, and the movement restriction unit 39 releases the restriction on the movement of the first liquid container 41 and the second liquid container 42".

[0161] In the second embodiment, the control unit 25 performs liquid supply control processing, thereby performing a control method including the following fourth and fifth steps.

[0162] Step 4

[0163] With power connected, the switching unit 38 connects either the first supply path 36 or the second supply path 37 to the supply path 35, and the movement limiting unit 39 restricts the movement of the liquid container 40 on the side connected to the supply path 35. This fourth step is equivalent to... Figure 13 The processing of steps S22 and S23.

[0164] Step 5

[0165] When a power-off command is issued, the first supply path 36 and the second supply path 37 are both disconnected from the supply path 35 via the switching unit 38. Therefore, the movement restriction unit 39 releases the restriction on the movement of the first liquid container 41 and the second liquid container 42. This fifth step is equivalent to... Figure 13 The processing of steps S25 and S26.

[0166] According to the second embodiment, in addition to obtaining the same effects (1-1) to (1-9) as the first embodiment, the following effects are also obtained.

[0167] (2-1) A control method for a liquid ejection device 11, the liquid ejection device 11 comprising a liquid ejection head 20, a supply flow path 35, a first supply flow path 36, a second supply flow path 37, a switching unit 38, and a movement restriction unit 39. The control method includes the following fourth and fifth steps. In the fourth step, when power is connected, the switching unit 38 connects either the first supply flow path 36 or the second supply flow path 37 to the supply flow path 35, and the movement restriction unit 39 restricts the movement of the liquid container on the side connected to the supply flow path 35 (steps S22, S23). In the fifth step, when a power cut-off command is received, the switching unit 38 disconnects both the first supply flow path 36 and the second supply flow path 37 from the supply flow path 35, and the movement restriction unit 39 releases the movement restriction on the first liquid container 41 and the second liquid container 42 (steps S25, S26). According to this control method, it is possible to prevent the liquid container 40 from being mistakenly removed while the power is on. Furthermore, it is possible to remove and replace the liquid container 40 when the power is off.

[0168] Third implementation method

[0169] In the first embodiment described above, the movement restriction unit 39 restricts the movement of the liquid container 40 in use by locking and unlocking the engaging part 33, which has an operation part 34, thereby restricting the engagement and disengagement operations based on the user's operation part 34. In contrast, the engaging part 33 in the third embodiment does not have an operation part 34. In other words, the engaging part 33 is not operated by the user. For the movement restriction unit 39 of this embodiment, for example, the drive source 53 drives the engaging part 33 to an engaged state (engaged with the liquid container 40) and a non-engaged state (not engaged with the liquid container 40). The drive source 53 moves the engaging part 33 to the engaged state position (engaged position), thereby restricting (locking) the movement of the liquid container 40 in use. Furthermore, the drive source 53 moves the engaging part 33 to the non-engaged state position (non-engaged position), thereby releasing the restriction (locking) on ​​the movement of the liquid container 40 that is not in use. In this way, the movement of the first liquid container 41 inserted into the first slot SL1 of the assembly part 31 and the second liquid container 42 inserted into the second slot SL2, which is the object of use, is restricted, while the movement of the other party, which is not the object of use, is not restricted.

[0170] The third embodiment is Figure 4 The structure of the operation unit 34 is omitted in this embodiment. Other basic structures are shared with the first and second embodiments. Therefore, the following uses... Figure 4 The main differences will be explained. Other differences from the first and second embodiments described above are: the engagement part 33 is configured to be movable to an engagement state and a non-engaged state via the lever 39A by the drive source 53.

[0171] like Figure 4 As shown, the switching unit 38 includes: a first on / off valve 54, which opens and closes a first supply flow path 36; a second on / off valve 55, which opens and closes a second supply flow path 37; and a first drive mechanism 51, which is used to switch the opening and closing of the first on / off valve 54 and the second on / off valve 55.

[0172] The movement restriction unit 39 includes a first engaging portion 33A, which can engage with a first liquid container 41; and a second engaging portion 33B, which can engage with a second liquid container 42. Furthermore, the movement restriction unit 39 includes a second drive mechanism 52, which is used to selectively switch the first engaging portion 33A and the second engaging portion 33B to an engaged state and an unengaged state. The liquid supply device 30 includes a drive source 53 for driving the first drive mechanism 51 and the second drive mechanism 52.

[0173] For example, the engaging portion 33 is forceped in the direction from the engaged state to the unengaged state (the direction of restriction release). Specifically, the engaging portion 33 is forceped in the direction of restriction release by a force-applying member such as a spring. The engaging portion 33 is configured from the unengaged state to the engaged state by overcoming the force of the force-applying member via the second drive mechanism 52 using the power of the drive source 53, thereby engaging with the liquid container 40. The engaging portion 33, in the engaged state, restricts the movement of the liquid container 40. In other words, the liquid container 40 is locked and cannot be removed from the assembly portion 31.

[0174] Furthermore, in the third embodiment, similar to the first and second embodiments, the movement restriction unit 39 and the switching unit 38 selectively restrict the movement of the first liquid container 41 and the second liquid container 42 in a switching linkage. When the switching unit 38 connects the first supply flow path 36 to the supply flow path 35, the movement restriction unit 39 restricts the movement of the first liquid container 41. Additionally, when the switching unit 38 connects the second supply flow path 37 to the supply flow path 35, the movement restriction unit 39 restricts the movement of the second liquid container 42.

[0175] In detail, when the switching unit 38 connects the first supply flow path 36 with the supply flow path 35, the third cam 63 and the fourth cam 64 are driven by the drive source 53 to "state 1" (see reference). Figure 11 In this "state 1", lever 39A presses the first engaging portion 33A into the engaging position, thereby engaging the first engaging portion 33A with the first liquid container 41. As a result, the movement of the first liquid container 41 inserted into the first slot SL1 is restricted. Therefore, the user cannot remove the first liquid container 41.

[0176] Furthermore, when the switching unit 38 connects the second supply flow path 37 to the supply flow path 35, the third cam 63 and the fourth cam 64 are driven by the drive source 53 to enter "state 3" (see reference). Figure 11 In this "state 3", lever 39A pulls the engaging part 33 back to the non-engaged position, so that the second engaging part 33B does not engage with the second liquid container 42. As a result, the movement of the second liquid container 42 inserted into the second slot SL2 is restricted. Therefore, the user cannot remove the second liquid container 42.

[0177] In order to achieve the operation of such engaging parts 33A and 33B, compared with the first and second embodiments... Figure 8 The structures are different. That is, such as Figure 8As shown in the upper middle section, the limiting part 33C has a slope, which allows the front end 39B of the rod 39A to contact (not shown) during the process of the rod 39A protruding due to the force of the force-applying member 39S. During the process of the rod 39A protruding due to the force of the force-applying member 39S, the front end 39B of the rod 39A presses the engaging part 33 from the non-engaged position to the engaged position via the slope, thereby achieving an engaged state in which the engaging part 33 engages with the liquid container 40. On the other hand, during the process of the rod 39A retracting against the force of the force-applying member 39S, the force of the front end 39B of the rod 39A pressing into the engaging part 33 via the slope disappears. Therefore, the engaging part 33 is pulled back from the engaged position to the non-engaged position due to the force of the force-applying member such as a spring (not shown). Thus, the engaging part 33 becomes a non-engaged state in which it does not engage with the liquid container 40.

[0178] According to this third embodiment, the effects of the first embodiment (1-1) to (1-10) are also obtained in the same way, and the effects of the second embodiment (2-1) are also obtained in the same way.

[0179] It should be noted that the above-described embodiments can also be modified as shown in the following variations. Furthermore, it is possible to appropriately combine the above-described embodiments and the following variations to create further variations, and it is also possible to appropriately combine the following variations with each other to create further variations.

[0180] Alternatively, the four cams 61 to 64 can be fixed to different shafts 65 that rotate under the power of the drive source 53. In this case, two of the four cams 61 to 64 can be fixed to a common shaft 65, and one of each can be fixed to a different shaft 65.

[0181] Alternatively, the liquid supply device 30 may have multiple drive sources 53 that drive the four cams 61 to 64. In this case, the four cams 61 to 64 may be driven by two of each other through a common drive source 53, or each may be driven individually by a different drive source.

[0182] The four cams 61-64 are not limited to eccentric cams that are rotary planar cams. The four cams 61-64 can also be planar cams or three-dimensional cams. If cams 61-64 are planar cams, they can also be other rotary types or linear types. Furthermore, the four cams 61-64 can be different types of cams. The four cams 61-64 can also be a mixture of planar cams and three-dimensional cams. Other rotary types include plate cams, slotted cams, and plate-rib cams. As linear types, examples include linear cams, linear slotted cams, and straight-rib cams. As three-dimensional cams, examples include cylindrical, conical, barrel-shaped, and drum-shaped cams.

[0183] The number of cams is not limited to four. There can also be two cams switching the two opening / closing valves 54 and 55 and the two locking mechanisms 391 and 392. For example, the first lever 71 for switching the two opening / closing valves 54 and 55 can be driven via a common cam. Alternatively, the second lever 75 for switching the two locking mechanisms 391 and 392 can also be driven via a common cam.

[0184] Movement of one of the liquids in use can be restricted between two liquid containers 40 containing the same type of liquid, but movement of one of the liquids in use can also be restricted between three liquid containers 40 containing the same type of liquid. In short, it is possible to restrict movement of one of the liquids in use between multiple liquid containers 40, including a first liquid container 41 and a second liquid container 42 containing the same type of liquid.

[0185] Alternatively, the assembly unit 31 may have a cover for each slot that covers the liquid container 40 inserted into the slot. Furthermore, it may be configured such that the cover of the liquid container 40 in use, one of the two liquid containers 41 or 42 containing the same type of liquid, is locked by the movement limiting unit 39, thereby restricting the movement of the liquid container 40 in use. For example, if the drive source 53 is activated, the engaging part 33 corresponding to the liquid container 40 in use becomes engaged with the cover covering the liquid container 40 in use. Therefore, the engaging part 33 corresponding to the liquid container 40 that is not in use becomes unengaged and does not engage with the cover covering the liquid container 40 that is not in use.

[0186] Alternatively, the engaging portion 33 may function as a latch capable of engaging with the liquid container 40. More specifically, the first engaging portion 33A may be a first latch capable of engaging with the first liquid container 41, and the second engaging portion 33B may be a second latch capable of engaging with the second liquid container 42. When the first liquid container 41 is inserted into the first slot SL1, the first latch engages with the first liquid container 41, thereby restricting its movement. When the second liquid container 42 is inserted into the second slot SL2, the second latch engages with the second liquid container 42, thereby restricting its movement. During liquid consumption, the movement of the liquid container 41 or the second liquid container 42 in use is restricted due to the latch engagement. The latch engagement of the other liquid container, which is not in use, is released. The engagement with the latch is released by using the power generated when the control unit 25 drives the drive source 53 to move the latching pawl in the direction of releasing the engagement with the liquid container 40.

[0187] Alternatively, the switching unit 38 and the movement restriction unit 39 can switch between state 1 and state 3, without using state 2.

[0188] Alternatively, when conveying media 14 such as single sheets of paper, the conveying unit 23 may include: a media receiving section such as a box containing the media 14; a feeding section that feeds the media 14 from the media receiving section; and a conveying roller that feeds the fed media 14. Alternatively, the conveying unit 23 may include: a tray holding the media 14; a feeding section that feeds the media 14 placed on the tray; and a conveying roller that transports the fed media 14 toward the recording position.

[0189] The liquid is not limited to ink; it can also be cleaning solution, pretreatment solution, posttreatment solution, etc.

[0190] Medium 14 is not limited to paper such as rolls or sheets; it can also be sheets or films made of plastic, metal, laminates, or ceramics.

Claims

1. A liquid supply device, characterized in that, have: The supply flow path is connected to a liquid nozzle capable of ejecting liquid; The first supply flow path connects the first liquid container containing the liquid to the supply flow path; The second supply flow path connects the second liquid container to the supply flow path, and the second liquid container contains a liquid of the same type as the liquid contained in the first liquid container; The switching unit is capable of switching between the first supply flow path and the second supply flow path, which is connected to the supply flow path; as well as The movement restriction unit is capable of selectively restricting the movement of the first liquid container and the second liquid container in conjunction with the switching unit. The switching unit and the movement limiting unit are driven by a shared drive source.

2. The liquid supply device according to claim 1, characterized in that, When the switching unit connects the first supply flow path to the supply flow path, the movement restriction unit restricts the movement of the first liquid container. When the switching unit connects the second supply flow path to the supply flow path, the movement restriction unit restricts the movement of the second liquid container.

3. The liquid supply device according to claim 1, characterized in that, The switching unit has: The first on / off valve opens and closes the first supply flow path; The second on / off valve opens and closes the second supply flow path; and The first drive mechanism is used to switch the opening and closing of the first on-off valve and the second on-off valve. The movement restriction part has: The first engaging portion is capable of engaging with the first liquid containment body; The second engaging portion is capable of engaging with the second liquid containment body; and The second drive mechanism is capable of selectively switching between a restricted state that restricts movement and an unrestricted state that does not restrict movement for both the first engaging portion and the second engaging portion. The drive source drives the first drive mechanism and the second drive mechanism.

4. The liquid supply device according to claim 3, characterized in that, The first engaging part includes a first operating part that allows the user to release the engaging state with the first liquid container. The second engaging part includes a second operating part that allows the user to release the engaging state with the second liquid containment body. The second drive mechanism can selectively switch between a restricted state that restricts the engagement state and an unrestricted state that does not restrict the engagement state for the first operating unit and the second operating unit, respectively.

5. The liquid supply device according to claim 1, characterized in that, The switching unit has: The first on / off valve opens and closes the first supply flow path; The second on / off valve opens and closes the second supply flow path; and The first drive mechanism is used to switch the opening and closing of the first on-off valve and the second on-off valve. The movement restriction part has: The first engaging portion is capable of engaging with the first liquid containment body; The second engaging portion is capable of engaging with the second liquid containment body; and The second drive mechanism is capable of selectively switching between an engaged state and an unengaged state for both the first engaging portion and the second engaging portion. The drive source drives the first drive mechanism and the second drive mechanism.

6. The liquid supply device according to claim 3, characterized in that, The first driving mechanism has: The first cam is mounted on a shaft that rotates in conjunction with the drive source and is capable of switching the opening and closing of the first on / off valve; and The second cam, mounted on the shaft, is capable of switching the opening and closing of the second on / off valve. The second drive mechanism has: The third cam is mounted on the shaft and is capable of switching the state of the first engaging portion; and The fourth cam is mounted on the shaft and is capable of switching the state of the second engagement part.

7. A liquid ejection device, characterized in that, have: A liquid nozzle is capable of spraying liquid. The liquid supply device according to claim 1; and The control unit controls the switching unit and the movement restriction unit.

8. The liquid ejection device according to claim 7, characterized in that, If the amount of liquid in the liquid container of the one whose movement is restricted by the movement restriction unit is lower than a predetermined threshold, the control unit switches the flow path connected to the supply flow path, and releases the movement restriction of the liquid container of the one party and restricts the movement of the liquid container of the other party.

9. The liquid ejection device according to claim 8, characterized in that, When a liquid container whose movement is not restricted by the movement restriction unit is replaced with a new liquid container, the control unit switches the flow path connected to the supply flow path, releases the movement restriction of the other liquid container, and restricts the movement of the new liquid container.

10. A control method for a liquid ejection device, characterized in that, have: A liquid ejector head records the liquid ejected from a medium. The supply path is connected to the liquid nozzle. The first supply flow path connects the first liquid container containing the liquid to the supply flow path; The second supply flow path connects a second liquid container containing a liquid of the same type as the liquid contained in the first liquid container to the supply flow path; The switching unit is capable of switching between the first supply flow path and the second supply flow path, which is connected to the supply flow path; as well as The movement restriction unit is capable of selectively restricting the movement of the first liquid container and the second liquid container in conjunction with the switching unit. The switching unit and the movement limiting unit are driven by a shared drive source. The control method for the liquid ejection device includes: When a command to consume liquid is received, the switching unit connects either the first supply path or the second supply path to the supply path, and the movement limiting unit restricts the movement of the liquid container on the side connected to the supply path. Perform the action of consuming the liquid; as well as After the operation is performed, the first supply flow path and the second supply flow path are disconnected from each other by the switching unit, and the movement restriction unit releases the movement restriction of the first liquid container and the second liquid container.

11. A control method for a liquid ejection device, characterized in that, have: A liquid ejector head records the liquid ejected from a medium. The supply path is connected to the liquid nozzle. The first supply flow path connects the first liquid container containing the liquid to the supply flow path; The second supply flow path connects a second liquid container containing a liquid of the same type as the liquid contained in the first liquid container to the supply flow path; The switching unit is capable of switching between the first supply flow path and the second supply flow path, which is connected to the supply flow path; as well as The movement restriction unit is capable of selectively restricting the movement of the first liquid container and the second liquid container in conjunction with the switching unit. The switching unit and the movement limiting unit are driven by a shared drive source. The control method for the liquid ejection device includes: When a power source is connected, the switching unit connects either the first supply path or the second supply path to the supply path, and the movement restriction unit restricts the movement of the liquid container on the side connected to the supply path. and When a command to cut off the power supply is issued, the first supply flow path and the second supply flow path are disconnected from the supply flow path by the switching unit, and the movement restriction unit releases the movement restriction of the first liquid container and the second liquid container.

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