Printing device

Abstract

A printing apparatus includes a tube configured to form a flow path for supplying a liquid to a liquid ejection unit configured to eject the liquid, a holding unit configured to hold the tube, and a valve unit configured to move from an open position to a closed position and from the closed position to the open position, in the closed position, the valve unit pressurizes and occludes the tube held by the holding unit with a pressurizing portion, in the open position, the valve unit opens the tube held by the holding unit. Here, the valve unit includes a pivot shaft and is able to pivotally move around the pivot shaft to move to the closed position and the open position, and an extending direction of the pivot shaft is a direction that intersects with an extending direction of the tube held by the holding unit.

Description

Technical Field

[0001] This invention relates to printing equipment. Background Technology

[0002] A printing device is known to be constructed using a tube that connects a printhead for ejecting ink to an ink reservoir containing ink to be supplied to the printhead. Japanese Patent Application Publication No. 2015-27741 (Reference 1) discloses an on / off valve that can close the tube between the printhead and the ink reservoir by pressurizing the tube using a linearly driven pressurizing member.

[0003] According to the printing device disclosed in Reference 1, when pressurizing a tube with a large diameter or when pressurizing two or more tubes together, the tube pressurizing member may be unable to apply pressure to each tube in parallel. As a result, the tube pressurizing member or the tube support member used to support the tube may tilt relative to the width direction of the tube, leading to leakage due to the inability to fully pressurize the tube. Summary of the Invention

[0004] A printing apparatus according to an aspect of the invention includes: a tube configured to form a flow path for supplying liquid to a liquid ejection unit configured to eject liquid; a holding unit configured to hold the tube; and a valve unit configured to move from an open position to a closed position and from a closed position to an open position, wherein in the closed position, the valve unit pressurizes and closes the tube held by the holding unit using a pressurizing portion, and in the open position, the valve unit opens the tube held by the holding unit. Here, the valve unit includes a pivot axis and is pivotally movable about the pivot axis to move to the closed position and the open position, and the extending direction of the pivot axis is a direction intersecting the extending direction of the tube held by the holding unit.

[0005] Other features of the invention will become apparent from the description of the following exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0006] Figure 1 It is a three-dimensional view showing the printing equipment;

[0007] Figure 2 This is a schematic diagram showing the positional relationship between the ink can and the printhead;

[0008] Figures 3A to 3D It is a 3D diagram of the printing equipment;

[0009] Figure 4A and Figure 4B This is a schematic diagram showing the status of the ink canister and printhead;

[0010] Figure 5 This is a flowchart of the ink filling sequence;

[0011] Figure 6 It is a block diagram including the structure of the printing equipment;

[0012] Figure 7A and Figure 7B It is a three-dimensional view of the operating unit in the valve opening and closing mechanism;

[0013] Figure 8 It is a three-dimensional view showing the outline of the opening and closing valve mechanism;

[0014] Figure 9A and Figure 9B It is a cross-sectional view showing the outline of the opening and closing valve mechanism;

[0015] Figure 10 It is a cross-sectional view showing the outline of the opening and closing valve mechanism;

[0016] Figure 11 It is a 3D diagram of the opening and closing valve mechanism;

[0017] Figure 12A and Figure 12B It is a side view of the valve opening and closing mechanism; and

[0018] Figure 13 It is a cross-sectional view showing the outline of the opening and closing valve mechanism. Detailed Implementation

[0019] Embodiments of the present invention will now be described with reference to the accompanying drawings. It should be noted that the following embodiments are not intended to limit the scope of the invention, and not all combinations of features described in the embodiments are always necessary. In the following description, the same reference numerals will be used to denote the same configurations in the embodiments.

[0020] In this specification, the term "printing" (also referred to as "print") is not limited to the formation of meaningful information such as text and graphics, but encompasses the formation of all meaningful and meaningless information. It is also assumed that the term broadly includes the formation of images, diagrams, patterns, etc., on a printing medium, as well as the processing of the printing medium, regardless of whether these objects are displayed in a manner perceptible to the human eye.

[0021] At the same time, the term "ink" (which can also be called "liquid") should be interpreted as broadly as the definition of "printing" above. Therefore, it is assumed that the term refers to a liquid used to form images, patterns, designs, etc., used to process printing media, and used to modify ink properties (such as the coagulation and insolubility of colorants contained in the ink to be applied to the printing media) when the liquid is applied to the printing media.

[0022] In addition, the term "printing media" includes not only paper used in conventional printing equipment, but also a wide range of media that can accept ink, such as cloth, plastic film, metal plates, glass, ceramics, wood, and leather.

[0023] <<First Implementation Method>>

[0024] <The Structure of Printing Equipment>

[0025] Figure 1 This is a perspective view of a printing device 100, which is an example of a liquid ejection device in this embodiment. Figure 1 Partial configuration of a printing apparatus 100 is shown. The printing apparatus 100 includes: an ink tank 11 containing ink; a printhead 62 ejecting ink supplied from the ink tank 11 via an ink supply passage 51; and a carriage 61 holding the printhead 62. The carriage 61 is configured to scan the printing medium (not shown) in a direction orthogonal to the transport direction of the printing medium, printing an image on the printing medium via a combination of scanning through the carriage 61 and ejection from the printhead 62.

[0026] Although this embodiment describes an example of a printing apparatus, the same applies to liquid ejection apparatuses. For example, such a liquid ejection apparatus may include: a liquid container holding liquid; a liquid ejection unit ejecting liquid supplied from the liquid container via an ink supply passage; and a liquid ejection unit holder holding the liquid ejection unit. This embodiment will be described using a printing apparatus 100 as an example of a liquid ejection apparatus.

[0027] Each ink tank 11 can be either a first ink tank 111 or a second ink tank 112. This embodiment illustrates the case where multiple first ink tanks 111 are provided assuming the use of multiple types of ink. However, when using a single type of ink, only a single ink tank (such as a first ink tank 111) may be provided. Simultaneously, when using a large amount of ink, a second ink tank 112 with a capacity greater than that of the first ink tank 111 may be provided. It is not limited to this; only the second ink tank 112 may be provided, or both the first ink tank 111 and the second ink tank 112 may be provided as in this embodiment. When two or more ink tanks 11 are provided, the ink tanks 11 can be positioned on the right and left sides relative to the center of the printing device 100, or only on one side, depending on the size of the printing device 100. In this embodiment, three color ink tanks 111, each capable of holding cyan, magenta, and yellow ink, are provided as first ink tanks 111. Simultaneously, one black ink tank 112, capable of holding black ink, is provided as the second ink tank 112. This will be described later. Figure 1 The construction of the other components shown.

[0028] The printing apparatus 100 includes a feed roller (not shown) for feeding printing media, a transport roller (not shown) for conveying printing media, and an discharge roller (not shown) for discharging printing media. A printhead 62 is detachably mounted to a carriage 61 and is configured to eject ink onto the surface of the printing media conveyed by the transport roller, thereby printing an image onto the printing media. Additionally, the printing apparatus 100 includes an ink suction mechanism 64 with a suction cap 65 (see [link to ink suction mechanism]). Figure 4B To restore the ejection performance of printhead 62, printing apparatus 100 brings suction cap 65 into contact with printhead 62 and uses ink suction mechanism 64 to draw ink from ink ejection outlet 63 of printhead 62 (see ink ejection outlet 63). Figure 4B The ink suction mechanism 64 includes, for example, a tube connected to the suction cap 65 and a suction pump that serves as the suction unit.

[0029] This embodiment describes an example of printhead 62 ejecting ink according to movement associated with scanning via a carriage. However, the invention is not limited to this configuration. The printhead can be so-called linear, with ink jet exits provided in an area corresponding to the width of the printing medium, and configured to print images onto the printing medium without scanning via a carriage.

[0030] Figure 2 This is a schematic diagram showing the positional relationship between the ink tank 11 and the printhead 62. A supply pipe 17, constituting an ink supply passage 51 for supplying ink to the printhead 62, is attached to the ink tank 11. Additionally, a pipe constituting an atmospheric communication passage 54 for communicating the interior of the ink tank 11 (buffer chamber 16) with the atmosphere is connected to the ink tank 11. The supply pipe 17 is formed of a flexible material such as an elastomer. Valve units 53 for blocking the communication of liquid or air are respectively provided at a portion of the ink supply passage 51 between the ink tank 11 and the printhead 62, and at a portion of the atmospheric communication passage 54 between the ink tank 11 and the atmospheric communication port 52.

[0031] Valve unit 53 includes a black-side valve unit and a color-side valve unit. The black-side valve unit closes the ink supply passage 51 connected to the black ink tank 112 and the atmospheric communication passage 54, respectively. The color-side valve unit closes the ink supply passage 51 connected to the color ink tank 111 and the atmospheric communication passage 54, respectively. Simultaneously, an on / off valve mechanism 160 for cutting off liquid or air communication is provided at a portion of each ink supply passage 51 located between valve unit 53 and printhead 62. The on / off valve mechanism 160 includes a black-side on / off valve mechanism and a color-side on / off valve mechanism. The black-side on / off valve mechanism closes the ink supply passage 51 connected to the black ink tank 112. The color-side on / off valve mechanisms close the ink supply passage 51 connected to the color ink tank 111, respectively. Each on / off valve mechanism 160 includes various components. Here, the black-side and color-side on / off valve mechanisms may use common, identical components or different components from each other. Details of the on / off valve mechanisms will be described later. The difference in function between the opening and closing valve mechanism 160 and the valve unit 53 will be described later.

[0032] In the printing apparatus 100 of this embodiment, the liquid-gas replacement section 15 of the ink tank 11 is located at a position H lower in the height direction than the ink jet outlet 63 of the printhead 62 to prevent ink leakage from the ink jet outlet 63 of the printhead 62. In other words, a negative pressure originating from the head difference corresponding to the height H is applied to the ink jet outlet 63. Meanwhile, a buffer chamber 16 is provided at the lower part of the ink tank 11. The buffer chamber 16 can store ink to be ejected when the meniscus in the liquid-gas replacement section 15 is disrupted due to the expansion of air inside the ink tank 11 caused by changes in atmospheric pressure or temperature. Therefore, ink leakage from the ink tank 11 through the atmospheric communication passage 54 can be suppressed. Figure 2 And as described later Figure 4A and Figure 4B In the diagram, dashed lines represent the open state of valve unit 53 and valve opening / closing mechanism 160, while solid lines represent their closed state.

[0033] Next, we will refer to Figures 3A to 5 The construction of the ink supply system in this embodiment and the flow from the point of ink injection to the point where the image can be printed are described. Figures 3A to 3D This is a perspective view of the printing device 100 according to this embodiment. Figures 3A to 3D It shows from Figure 3A The state in Figure 3D The image shows a 3D diagram illustrating the process of a user injecting ink into ink can 11. Figure 4A and Figure 4B This is a schematic diagram showing the state of the ink tank 11 and the printhead 62 according to this embodiment.

[0034] like Figure 3AAs shown, the printing device 100 includes a third cover member 41, which is provided with a mechanism for reading an image on the loaded original and is pivotally supported by the printing device 100 in an openable and closable manner. Note that the third cover member 41 may be a reading mechanism for reading an image on the original, or it may be an access cover forming an outer surface that exposes the internal components of the printing device 100 for removing printing media that may cause poor delivery during image printing. Ink cartridges 11 are mounted on the front surface side (+y direction side) of the printing device 100, allowing the user to easily inject ink into the ink cartridges 11. As described above, a total of four ink cartridges 11 are provided in this embodiment, namely three color ink cartridges 111 and one black ink cartridge 112. However, the type and number of ink cartridges 11 are not limited to this example. For example, more than four ink cartridges 11 may be provided to improve the image printing quality of the printing media.

[0035] When the user fills the ink tank 11, the user first rotates the third cover component 41 upwards, and as follows: Figure 3B As shown, the third cover member 41 is set to the open state. When the third cover member 41 is rotated a predetermined amount, the open state of the third cover member 41 can be maintained by using a locking mechanism (not shown). Here, the cover sensor 18 is mounted on the housing 19 and can detect the open or closed state of the third cover member 41. The cover sensor 18 is not limited to a mechanical sensor designed to detect mechanical contact. For example, the cover sensor 18 can be an optical sensor. Here, the locking mechanism can be released by further rotating the third cover member 41 upward. This action can close the third cover member 41. By opening the third cover member 41, the internal components of the printing device 100 are exposed, and the user can operate the second cover member 21 (see...). Figure 3B and Figure 1 ).

[0036] The second cover member 21 is pivotally supported in a manner that allows it to move between a forward-tilted position (closed cover position) and an upward-raised position (open cover position). Each ink cartridge 11 is provided with a second cover member 21. More specifically, the black ink cartridge 112 is covered by a black second cover member 212, and the three color ink cartridges 111 are integrally covered by a single color second cover member 211. The black second cover member 212 and the color second cover member 211 are collectively referred to as second cover members 21. Although in this embodiment, the black second cover member 212 and the color second cover member 211 are formed into different shapes, these cover members can be formed into the same shape.

[0037] When the user operates the second cover member 21 from the closed position to the open position, the first cover member 12 for closing the ink tank 11 will be revealed (see...). Figure 1 , Figure 3C and Figure 4B The first cover member 12 is pivotally supported in a manner that allows it to move between a closed tap position (closed tap position) and a raised position (open tap position) of the ink tank 11. When the user operates the first cover member 12 from the closed tap position to the open tap position, the ink inlet 14 located on the upper part of the ink tank 11 for user ink refilling is revealed (see...). Figure 3D and Figure 4A ).

[0038] The first cover member 12 is provided with a sealing member 13 formed of an elastomer such as rubber. By operating the first cover member 12 to the closed plug position, the sealing member 13 closes the injection port 14 to prevent ink leakage contained in the ink container 11. In this embodiment, the valve unit 53 operates in conjunction with the operation of raising the first cover member 12, thereby blocking the ink supply passage 51 and the atmospheric communication passage 54 respectively. Figure 4A ).

[0039] The user can inject ink into the ink tank 11 by inserting a container (not shown) containing ink into the injection port 14. After the ink injection is complete, the user operates the first cover member 12 to the closed position again. The valve unit 53 operates in conjunction with this operation, thereby opening the ink supply passage 51 and the atmospheric connection passage 54 respectively (see...). Figure 4B Subsequently, the user operates the second cover member 21 to the closed position, thereby closing the third cover member 41. The printing device 100 is able to detect the closure of the third cover member 41 by using a cover sensor 18 configured to detect the position of the third cover member 41. Upon detecting the closure of the third cover member 41, as... Figure 4B As shown, the printing device 100 contacts the suction cap 65 with the printhead 62 to fill the ink L in the ink tank 11 into the ink supply passage 51. Then, the ink suction mechanism 64 performs a suction operation to draw the ink L out from the ink jet outlet 63. As a result of this suction operation, the supply tube 17 constituting the ink supply passage 51 is filled with ink. In addition, during this suction operation, a large negative pressure can be applied to the ink jet outlet 63 by executing the opening and closing control of the on / off valve mechanism 160. More specifically, the suction pump of the ink suction mechanism 64 is driven while the on / off valve mechanism 160 is closed and the printhead 62 is covered by the suction cap 65. In this way, a negative pressure is generated between the on / off valve mechanism 160 and the ink jet outlet 63 of the printhead 62. Then, when the suction pump stops and the on / off valve mechanism 160 opens, ink is filled into the printhead 62 by means of the generated negative pressure. Meanwhile, the opening and closing valve mechanism 160 also has the function of blocking the ink supply passage 51 to prevent ink leakage when the printing device 100 is moved.

[0040] As described above, in this embodiment, the ink supply passage 51 is provided with two types of valves: valve unit 53 and on / off valve mechanism 160, which have independent and different functions. Specifically, valve unit 53 closes the ink supply passage 51 when filling the ink tank 11 with ink, and opens the ink supply passage 51 in other cases. On the other hand, on / off valve mechanism 160 closes the ink supply passage 51 to suppress ink leakage or to perform efficient suction when filling ink. Details of on / off valve mechanism 160 will be described later.

[0041] With the ink filled as described above, when printing an image onto a printing medium, for example, ink is ejected from the ink jet outlet 63, and ink is supplied from the ink tank 11 to the print head 62 in an amount equal to the amount of ink ejected from the print head 62. Ink is continuously supplied from the ink tank 11 to the print head 62 until the ink in the ink tank 11 is below a predetermined amount.

[0042] The above example has explained the scenario where the user performs opening and closing operations by manipulating the first cover member 12, the second cover member 21, and the third cover member 41. Alternatively, the opening and closing operations can be performed automatically by means of controls within the printing device.

[0043] <Ink Fill Sequence>

[0044] Figure 5 This is a flowchart of the ink filling sequence. When starting the ink filling sequence, first in S51, the printing device 100 moves the carriage 61 holding the printhead 62 to a suction position opposite the suction cap 65. In S52, the printing device 100 brings the suction cap 65 into contact with the printhead 62. In S53, the printing device 100 performs a suction operation using the suction cap 65 to draw ink from the ink jet outlet 63 of the printhead 62. In this case, the suction operation can be performed in conjunction with the opening and closing control of the opening and closing valve mechanism 160 as discussed earlier. After the suction operation is completed, in S54, the printing device 100 removes the suction cap 65 from the printhead 62. Then, in S55, the printing device 100 moves the carriage 61 from the suction position to the standby position. Thus, the series of operations of the ink filling sequence is terminated.

[0045] <Block Diagram>

[0046] Figure 6 This is a block diagram including the structure of the printing apparatus 100 according to this embodiment. The printing apparatus 100 includes a printhead 62, an MPU 601, a ROM 602, a RAM 603, a carriage motor 604, a transport motor 605, a printhead driver 607, a carriage motor driver 608, a transport motor driver 609, and an I / F unit 613. A program serving as an image processing unit 6021 is stored in the ROM 602.

[0047] MPU 601 controls the operation and data processing of each unit. ROM 602 stores programs and data to be executed by MPU 601. RAM 603 temporarily stores processing data to be executed by MPU 601 and data received from host computer 600. Printhead 62 is controlled by printhead driver 607. Carriage 61 is driven by carriage motor 604. Carriage motor 604 is controlled by carriage motor driver 608. Feed roller, conveyor roller, and discharge roller are driven by conveyor motor 605. Conveyor motor 605 is controlled by conveyor motor driver 609. Host computer 600 includes printer driver 610, used to process printing information such as the printed image and image quality, and to communicate with printing device 100 when the user issues a command to perform a printing operation. MPU 601 exchanges printed images with host computer 600 through I / F unit 613.

[0048] <Structure of the opening and closing valve mechanism>

[0049] The following is a description of the construction and operation of the opening and closing valve mechanism 160 according to this embodiment. Figure 7A and Figure 7B This is a perspective view of the operation unit 161 in the valve mechanism 160 according to this embodiment. Figure 8 This is a perspective view showing the outline of the opening and closing valve mechanism 160 according to this embodiment. Figure 9A and Figure 9B This is a cross-sectional view showing the outline of the opening and closing valve mechanism 160 according to this embodiment. Figure 9A and Figure 9B It is along Figure 8 The cross-sectional view taken by the IX section line in the diagram. Figure 9A This diagram shows the open state of the opening / closing valve mechanism 160. Figure 9B This is a diagram showing the closed state of the opening and closing valve mechanism 160. Figure 10 This shows the opening and closing valve mechanism 160 and... Figure 9B A cross-sectional view of the same closed state. Figure 11 It is the slave of the opening and closing valve mechanism 160. Figure 8 A stereoscopic image viewed from different perspectives. Figure 12A and Figure 12B This is a side view of the opening and closing valve mechanism 160. Figure 12A The open state of the valve mechanism 160 is shown. Figure 12B The closed state of the on / off valve mechanism 160 is shown. Figure 13 This is a cross-sectional view showing the outline of the opening and closing valve mechanism 160. Figure 13 It is along Figure 8 The cross-sectional view taken from section line XIII. Refer to the relevant section as appropriate. Figures 7A to 13 The following description is provided.

[0050] As described above, the on / off valve mechanism 160 is a valve used to close and open (establish communication) the ink supply passage 51 formed by the supply pipe 17. Figure 1 , Figure 7A , Figure 7B and Figure 8 As shown, the on / off valve mechanism 160 includes an operating unit 161 that can be manually operated by the user. The operating unit 161 is configured to allow the user to rotate it using the operating surface 161a. The on / off valve mechanism 160 is arranged at the ink supply passage 51 and can be switched between an open state for establishing communication between the ink tank 11 and the printhead 62 and a closed state for blocking this communication by operating the operating unit 161. Additionally, as... Figure 7A and Figure 7B As shown, printing mark 166 and maintenance mark 167 are drawn at the operating position of the operating unit 161 to allow the user to visually identify the open / closed state of the valve in the valve-on / off mechanism 160. When the operating surface 161a of the operating unit 161 is at the position of printing mark 166, the valve-on / off mechanism 160 does not block the ink supply passage 51, thus allowing ink to be supplied from the ink tank 11 to the print head 62. In other words, the printing device 100 is in a state where it can print on the printing medium. On the other hand, when the operating unit 161 is rotated from the position of printing mark 166 to the position of maintenance mark 167, and the operating surface 161a is on the side indicated by maintenance mark 167, the valve-on / off mechanism 160 blocks the ink supply passage 51. As a result, ink is not supplied from the ink tank 11 to the print head 62. Therefore, with ink movement suppressed in the ink supply passage 51, the user can perform operations such as replacing the print head 62 or transporting the printing device. Meanwhile, by using the on / off valve mechanism 160 to keep the ink supply passage 51 closed during the above-mentioned suction operation, the initial filling of the print head 62 with ink or the removal of air bubbles from the ink supply passage 51 can be performed efficiently.

[0051] The opening / closing valve mechanism 160 according to this embodiment can be opened and closed manually and automatically by connecting to a drive unit. Here, the drive unit can be electrically driven by an external power source. In other words, in addition to manual operation by the user, the operation unit 161 can be switched between an open state and a closed state by driving an external drive unit. Figure 3B As shown, the printing device 100 includes a housing 19. Additionally, as... Figure 7A and Figure 7B As shown, the housing 19 includes an opening 190. The operation unit 161 is arranged in the opening 190. Meanwhile, since a cover sensor 18 is provided in this embodiment... Figure 3B Therefore, the printing device 100 can detect whether the operation unit 161 is in a user-operable state by using the cover sensor 18.

[0052] like Figures 8 to 13 As shown, the opening and closing valve mechanism 160 includes an operating unit 161, a cover component 162, a receiving component 163, a shifting component 164, a cam 165, a holding component 169, a force-applying component 170, and a drive mechanism 260.

[0053] like Figures 8 to 9B As shown, the cover member 162 and the retaining member 169 have shapes that respectively define the arrangement route of the supply tubes 17 and hold the supply tubes 17 near the on / off valve mechanism 160. In this embodiment, one end of each supply tube 17 is connected to the printhead 62, and the other end is connected to the corresponding ink reservoir 11. The supply tubes 17 in this embodiment include supply tubes 17a, 17b, 17c, and 17d. Each supply tube 17 includes a curved region that can bend as the printhead 62 moves. The on / off valve mechanism 160 is configured such that the curved regions of each supply tube 17 are located between the printhead 62 and the cover member 162. In other words, the on / off valve mechanism 160 is arranged in the region of each supply tube 17 that does not move with the movement of the carriage 61.

[0054] like Figures 9A to 13 As shown, the shifting member 164 includes pressurizing portions 164a and 164b that pressurize the supply pipe 17, and a first pivot axis 164c. A force is applied to the shifting member 164 about the first pivot axis 164c in a direction toward the cam 165 (described later) using a force-applying member (not shown). Simultaneously, the shifting member 164 is a member capable of pivoting about the first pivot axis 164c and capable of shifting in a direction interfering with the supply pipe 17. In other words, the shifting member 164 is arranged in a manner capable of advancing toward and retracting from the supply pipe 17.

[0055] The receiving member 163 is a member for receiving the displacement member 164, which is capable of shifting along the direction of interfering with the supply tube 17, and includes contact portions 163a, 163b, 163c, and 163d, and second pivot shafts 163e and 163h. The second pivot shafts 163e and 163h are fitted into bearing portions provided in the holding member 169, and the receiving member 163 is pivotally movable about the second pivot shafts 163e and 163h. The receiving member 163 is provided on the opposite side to the side where the portion containing the displacement member 164 is located, corresponding to each supply tube 17. The receiving member 163 is forceped by the force-applying member 170 in a direction close to the displacement member. The receiving member 163 is subjected to a force applied by the force-applying member 170 toward the rotation stop portion 169a of the holding member 169, thereby controlling the amount of pivotal movement toward the portion holding the supply tube 17. Receiving members 163 are provided for each tube, and each receiving member 163 is subjected to a force applied by the force-applying member 170 toward the rotation stop 169a of the holding member 169. Each receiving member 163 also includes a pivot axis. In this embodiment, the pivot axis of the receiving member 163 corresponding to the contact portions 163a, 163b, and 163c is a second pivot axis 163e. Although FIG. 9 shows the second pivot axis 163e corresponding to the contact portion 163a, the second pivot axis 163e of the receiving member 163 corresponding to the contact portions 163b and 163c is also included on the inside of the paper. The pivot axis of the receiving member 163 corresponding to the contact portion 163d is a second pivot axis 163h (see...). Figure 13 Although an example of setting a pivot axis for each receiving member 163 has been given, it is only necessary to set a pivot axis independently for two or more receiving members 163. For example, in this document, a single second pivot axis 163e can be shared as the pivot axis of the receiving member 163 corresponding to the contact portions 163a, 163b and 163c.

[0056] This embodiment includes a pressure-applying portion 164a of a shifting member 164 acting on a first tube and corresponding contact portions 163a, 163b, and 163c of a receiving member 163 (see...). Figure 12A and Figure 12B Furthermore, this embodiment includes a displacement member 164 acting on the pressurizing portion 164b of the second tube and the contact portion 163d of the receiving member. For example, the first tube is a supply tube 17a, 17b, and 17c for cyan, magenta, and yellow. The second tube is a supply tube 17d for black. As described above, this embodiment is configured to pressurize the supply tube using two pressurizing portions 164a and 164b.

[0057] Reference Figure 9A and Figure 9B Continue the description. Note that... Figure 9A and Figure 9BThe supply tube 17a is shown as an example. Therefore, a description of an example of the pressurizing portion 164a and contact portion 163a acting on the supply tube 17a will be given below. Unless otherwise specifically stated in this specification, the same interpretation applies to the pressurizing portions 164a and 164b of the shifting member 164 acting on the remaining supply tubes 17b, 17c, and 17d, and to the contact portions 163b, 163c, and 163d of the receiving member 163. The shifting member 164 and each receiving member 163 are movably pivotally supported in a manner that allows them to move closer to and further away from each other, and the extension direction of their pivot axis is along... Figure 9A and Figure 9B The paper orientation (y-direction) is set, which is the same as the length direction of the tube. Figure 9A and Figure 9B The pivot axis is used to cross the x-direction (in this example, at a right angle). Therefore, even if the diameter or thickness of the pipe changes and there is a difference in the reaction force between the pipes in the y-direction, the inclination of the pressurized part 164a and the contact part 163a relative to the yz section is limited by the pivot axis, thus suppressing leakage. Although this embodiment describes an example of setting the first pivot axis 164c and the second pivot axes 163e and 163h, leakage can be suppressed by using any of the pivot axes.

[0058] like Figures 8 to 11 As shown, cam 165 includes a cam surface 165a and a camshaft 165b. Cam 165 rotates by engaging with operating unit 161, thereby displacing displacement member 164. Cam 165 can be separately mounted from operating unit 161, or it can be integrated with operating unit 161. Figure 9A and Figure 9B As shown, cam 165 is configured such that cam surface 165a contacts displacement member 164. When the operating unit 161 is rotated manually or automatically, cam 165 rotates about cam shaft 165b with this rotation, and displacement member 164, pushed by cam surface 165a, is displaced accordingly. Then, the pressurizing portion 164a of displacement member 164 presses supply pipe 17a against contact portion 163a of receiving member 163, thereby flattening supply pipe 17a. Thus, ink supply passage 51 is blocked. In other words, opening / closing valve mechanism 160 is set to the closed state. Hereinafter, displacement member 164, including pressurizing portions 164a and 164b, will be referred to as valve mechanism or simply valve. As described above, displacement member 164 is configured to move between a closed position that blocks supply pipe 17 and an open position that opens supply pipe 17.

[0059] like Figure 8As shown, the drive mechanism 260 includes a drive mechanism holding unit 261, a drive transmission gear 262 serving as a drive transmission unit for transmitting drive to the operation unit 161, an intermediate gear train 263, and a motor 265. The drive mechanism holding unit 261 includes the drive transmission gear 262, the intermediate gear train 263, and the motor 265. The motor 265 includes a motor gear 264. The drive transmission gear 262 engages with the operation unit 161. Drive force is transmitted from the motor 265, which is connected to an external power source (not shown), to the drive transmission gear 262 via the intermediate gear train 263, causing the operation unit 161 engaged with it to rotate. Therefore, by using the cam 165 to shift the shifting member, the connection of the ink supply passage 51 can be automatically closed and established. Here, by using a worm gear for the motor gear 264 as in this embodiment, the direction of drive transmission can be controlled in one direction from the motor 265 side toward the operation unit 161 side. However, the motor gear 264 is not limited to a worm gear, but other known gears can be used alternatively.

[0060] Figure 12A and Figure 12B This is a side view showing the construction of the opening and closing valve mechanism 160 according to this embodiment. Figure 12A The open state of the valve mechanism 160 is shown. Figure 12B The closed state of the opening / closing valve mechanism 160 is shown. The pressurizing portions 164a and 164b of the shifting member 164 are formed to integrally pressurize the supply pipe 17. The receiving member 163 includes auxiliary support portions 163i, 163j, 163k, and 163l located at positions capable of contacting the shifting member 164. The number of receiving members 163 and force-applying members 170 for applying force to the receiving member is equal to the number of supply pipes 17, so that they individually contact and support the supply pipes 17. The auxiliary support portions 163i, 163j, 163k, and 163l are located at the pressurized position P (see [reference needed]) where the supply pipe 17 is blocked by the pressurizing portions 164a and 164b and the contact portions 163a, 163b, 163c, and 163d. Figure 9BThe auxiliary supports 163i, 163j, 163k, and 163l are located near the contacts 163a, 163b, 163c, and 163d, respectively. The contact surfaces of the auxiliary supports 163i, 163j, 163k, and 163l with the pipes are located within the width of the contacts 163a, 163b, 163c, and 163d in the y-direction. In other words, each of the auxiliary supports 163i, 163j, 163k, and 163l includes a generally U-shaped groove for arranging the corresponding pipe within the groove. Because the auxiliary supports are located at a position different from the pressurized position P, the position of the supply pipe 17 in the y-direction can be limited without hindering the closure of the supply pipe 17 at the pressurized position P or increasing the y-direction dimension of the on / off valve mechanism 160.

[0061] <Operation to close the supply line>

[0062] Next, we will refer to Figure 9A and Figure 9B The operation of closing each supply pipe 17 by means of the opening and closing valve mechanism 160 according to this embodiment is described.

[0063] As mentioned above, Figure 9A and Figure 9B A cross-sectional view is shown at the location in the opening and closing valve mechanism 160 where the supply pipe 17a is blocked. Figure 9A The diagram shows a state where the pressure portion 164a of the shifting member 164 does not flatten the supply tube 17a, and the ink supply passage 51 is connected (open state). In this state, ink in the supply tube 17a can be supplied from the ink tank 11 to the print head 62 through the ink supply passage 51. If the operating unit 161 is rotated manually or automatically in this state, the cam surface 165a of the cam 165 will also rotate, thereby shifting the cam surface 165a in the direction that causes the shifting member 164 to interfere with the supply tube 17a.

[0064] Figure 9B The diagram shows the state where the pressure portion 164a of the shifting member 164 flattens the supply tube 17a, thus blocking the ink supply passage 51 (blocked state). In this state, the supply tube 17a is flattened between the pressure portion 164a of the shifting member 164 and the contact portion 163a of the receiving member 163, thereby blocking the ink supply passage 51 of the supply tube 17a. Figure 9B In this state, the supply pipe 17a is unable to supply ink from the ink tank 11 to the print head 62, and airflow within it is also prohibited. Figure 9BAs shown, in the blocked state of the ink supply passage 51, there is a gap Ls between the auxiliary support 163i and the shifting member 164 provided on the receiving member 163. The receiving member 163 is in a state where the reaction force when the supply pipe 17a is blocked is equal to the force applied by the force applying member 170. Therefore, it is possible to apply a constant pressure with the force required to block the pipe while absorbing the tolerances of the supply pipe 17a and other components. By rotating the cam 165, the cam surface 165a is moved from... Figure 9B The state shifting occurs when the shifting member 164 retracts toward the cam 165 using a force-applying member (not shown), and then returns to its original position. Figure 9A The supply pipe 17a releases the blockage through its own elasticity.

[0065] Here, right here Figure 9B In the occluded state shown, with respect to height in the z-direction, the first pivot shaft 164c is preferably positioned at approximately the same height as the contact portion 163a. ​​Therefore, when the tube is occluded, sliding in the x-direction between the pressurizing portion 164a and the contact portion 163a and the supply tube 17a can be reduced, thereby suppressing wear. In other words, the height difference in the z-direction between the first pivot shaft 164c and the contact portion 163a is preferably below a predetermined value. While the predetermined value can be appropriately determined based on the dimensions of the assembly, it is preferably a value sufficient to suppress wear. For example, the predetermined value can be defined as the sum of the thickness of the pressurizing portion 164a of the shifting member 164 and the thickness of the contact portion 163a of the receiving member 163.

[0066] Figure 10 The printing device 100 is shown to be used with Figure 9B The ink supply passage 51 shown is stored in a closed position for an extended period of time. For purposes such as ink delivery to the printing device 100, the ink supply passage 51 can remain closed for a long time. In this embodiment, when the supply tube 17a is stored in a closed state for an extended period, the receiving member 163, which is subjected to force by the force-applying member 170, may rotate upwards, and the gap Ls may disappear. Then, as... Figure 10 As shown, when the auxiliary support 163i contacts the displacement member 164, the displacement member 164 receives pressure from the receiving member 163, thereby reducing the pressure applied to the supply pipe 17a. Therefore, it is possible to suppress the development of deformation (creep) of the supply pipe 17a caused by long-term storage.

[0067] Next, we will refer to Figure 12A and Figure 12B Describe the operation of closing the supply pipe 17. As previously stated, Figure 12A This is a side view showing the opening and closing valve mechanism 160 in the open state. In this embodiment, as... Figure 12AAs shown, the outer diameter and thickness of supply pipes 17a, 17b, and 17c differ from those of supply pipe 17d. As previously stated, Figure 12B This is a side view showing the on / off valve mechanism 160 in the closed state. The ink supply passage 51 for all ink colors' supply pipes 17 is integrally blocked by the displacement of the shifting member 164. Figure 12B In the closed state, because the outer diameters and thicknesses of supply pipes 17a, 17b, and 17c differ from those of supply pipe 17d, the reaction forces when the pipes are closed are different. In this embodiment, the extension directions of the pivot axes of the shifting member 164 and the receiving member 163 are orthogonal to the long side direction (x-direction) of the supply pipe 17 (y-direction). Therefore, even when pipes with different reaction forces when closed are pressurized together, the inclination of the pressurizing portions 164a and 164b and the contact portions 163a, 163b, 163c, and 163d in the yz plane can be minimized. Thus, when pipes with different outer diameters and thicknesses are closed together, these pipes can be stably closed. Although this example illustrates the case where the outer diameters and thicknesses of supply pipes 17a, 17b, and 17c differ from those of supply pipe 17d, the present invention is not limited to this example. Even if at least one of the outer diameter and thickness of the supply pipes 17a, 17b and 17c is different from that of the supply pipe 17d, the same effect is achieved.

[0068] Furthermore, in this embodiment, when the pipes are closed, the thicknesses of the supply pipes 17a, 17b, and 17c differ from those of the supply pipe 17d. Therefore, if the distance between the pressurizing portion 164b and the contact portion 163d is set to a distance that allows the supply pipe 17d, which has a larger thickness, to be closed, the supply pipes 17a, 17b, and 17c, which have a smaller thickness, will not be completely closed. On the other hand, if the distance between the pressurizing portion 164a and the contact portions 163a, 163b, and 163c is set to a distance that allows the supply pipes 17a, 17b, and 17c to be closed, the reaction force of the supply pipe 17d will significantly increase when the supply pipe 17d is closed. In view of this situation, the receiving member 163 and the force-applying member 170 that applies force to the receiving member 163 are configured to individually contact and support the supply pipes 17a, 17b, 17c, and 17d, respectively. In this way, the force required for closure can be appropriately set according to the thickness of each tube. Therefore, when the tube is closed, the driving load of the cam 165 can be reduced without unnecessarily increasing the applied force.

[0069] Figure 13 This is a schematic cross-sectional view of the opening and closing valve mechanism 160, showing the first pivot shaft 164c of the shifting member 164, the pressurizing parts 164a and 164b, and the second pivot shafts 163e and 163h of the receiving member 163. Figure 12AAs shown, the outer diameters of supply pipes 17a, 17b, and 17c are different from those of supply pipe 17d. Pressurizing portions 164a and 164b pivot about the first pivot axis 164c. Therefore, the separation distance La between pressurizing portion 164a and supply pipes 17a, 17b, and 17c is different from the separation distance Lb between pressurizing portion 164b and supply pipe 17d, and La < Lb holds. The distances from the first pivot axis 164c of the shifting member 164 to pressurizing portions 164a and 164b are defined as distances Lm and Ln, respectively. In this embodiment, the integral shifting member 164 is independently provided with pressurizing portions 164a and 164b, and is configured such that the distance from the first pivot axis 164c of the shifting member 164 satisfies Lm < Ln. In this way, the required separation distance can be ensured according to each outer diameter of the supply pipe 17 while the supply pipes 17a, 17b, 17c and 17d can be closed together.

[0070] As described above, even when the tube is pressurized as a whole, regardless of the tube thickness or the size of the assembly, the tilt of the displacement member 164 and the receiving member 163 in the width direction of the tube can be reduced, thereby suppressing the occurrence of any incomplete closure state of the tube.

[0071] An example of a printing apparatus 100 comprising a plurality of supply tubes 17 has already been described. However, the present invention is also applicable to printing apparatuses using a single supply tube 17. Even when using a tube with a large diameter, the construction described in this embodiment can suppress the occurrence of leakage.

[0072] Construction of cover member 162 and retaining member 169

[0073] Next, a description of the construction of the cover member 162 and the retaining member 169 will be given. Ideally, the opening and closing valve mechanism is configured to pressurize the pipe in a direction orthogonal to its extension direction. However, even in this pressurizing structure, forces may be generated in the extension direction of the pipe due to component tolerances and other factors, causing the pipe to move along its extension direction. This pipe movement may consume excess pipe length, and the tensioned pipe may break off from the joint. On the other hand, pipe movement may increase excess pipe length, and redundant pipe that cannot be properly accommodated within the design space may lead to buckling.

[0074] Meanwhile, in the opening and closing valve mechanism 160 described in this embodiment, the shifting member 164 and the receiving member 163 are configured to be pivotally movable. Displacement of the pressurizing part 164a or the contact part 163b due to component tolerances may generate a force applied along the extension direction of the pipe. In view of this situation, the cover member 162 and the retaining member 169 of this embodiment are provided with a pipe configuration structure for suppressing the movement of the supply pipe 17 even when a force is generated along the extension direction of the supply pipe 17.

[0075] The following will refer to Figure 9A and Figure 9B The arrangement and construction of the supply pipes 17 located near the on / off valve mechanism 160 are described. The retaining member 169 includes a first pipe limiting portion 169b, a corresponding portion 169c, and a pipe support portion 169d. The cover member 162 includes a second pipe limiting portion 162a, an auxiliary contact surface 162b, and a third pipe limiting portion 162d. These components together form the arrangement path of the supply pipes 17.

[0076] The tube support portion 169d of the retaining member 169 has a shape in which, when the supply tube 17a is blocked by the opening and closing valve mechanism 160, its end protrudes above the contact portion 163a. ​​The tube support portion 169d supports the supply tube 17a near the pressurized position P. The contact surface of the tube support portion 169d with the tube is provided within the width of the tube support portion 169d in the y-direction. In other words, the tube support portion 169d includes a generally U-shaped groove in which the supply tube 17a is disposed. Figure 9B As shown, when the pipe is blocked, the contact portion of the pipe support 169d that contacts the pipe is located at approximately the same height as the pressurized position P in the z-direction (vertical direction).

[0077] The first tube limiting part 169b has a shape in which the end protrudes from the side where the supply tube 17a is supported by the receiving member 163 to a position located below the tube support part 169d.

[0078] In terms of distance from the pressurization position P in the extension direction of the tube, the second tube restrictor 162a is provided at a position farther from the pressurization position P than the first tube restrictor 169b. The second tube restrictor 162a has a shape that protrudes in a direction opposite to the protrusion direction (+z direction) of the first tube restrictor 169b (-z direction). The second tube restrictor 162a has a shape in which the end protrudes to a position below the end of the first tube restrictor 169b. In other words, the first tube restrictor 169b and the second tube restrictor 162a have shapes in which the end portions protrude to a position where the end portions overlap each other in the protrusion axis direction (vertical direction). The first tube restrictor 169b and the second tube restrictor 162a form a first gap W1 that serves as a path for the supply tube 17a. The first tube restrictor 169b and the second tube restrictor 162a protrude in mutually opposite directions in a direction (z direction) that is substantially orthogonal to the extension direction (x direction) of the supply tube 17a at the pressurization position P, thereby forming a configuration path for bending the supply tube 17a into an S-shape. On the other hand, a second gap W2 is formed between the end of the second tube limiting portion 162a and the opposing portion 169c of the retaining member 169, which is opposite to the end portion, serving as a path for the supply tube 17a. The supply tube 17a passing through the second gap W2 is arranged in the opposite direction (upward) to the side closer to the opposing portion 169c, and is configured to not leave the cover member 162 by using the third tube limiting portion 162d. By using the third tube limiting portion 162d to limit the supply tube 17a in the x-direction, the supply tube 17a is prevented from extending outside the cover member 162 due to the reaction force of the tube, even if the excess length of the tube increases due to tolerances, etc.

[0079] The supply pipe 17a is configured in an S-shape using the first pipe limiting portion 169b and the second pipe limiting portion 162a. The pipe reaction force of this S-shaped supply pipe 17a is generated in the direction that causes the supply pipe 17a to contact the end portion of either the first pipe limiting portion 169b or the second pipe limiting portion 162a. Because this pipe reaction force is continuously generated, a stable contact force with either the first pipe limiting portion 169b or the second pipe limiting portion 162a is generated. Therefore, even if a force is generated in the supply pipe 17a from the pressurized position P along the pipe's extension direction (x-direction), a static friction force is generated to resist this force, thus suppressing movement along the pipe's extension direction.

[0080] More precisely, if a force is applied in the direction (-x direction) that drags the supply pipe 17a toward the pressurized position P, the contact force between the side portion of the first pipe limiting part 169b and the supply pipe 17a will increase. Therefore, the frictional force resisting the dragging force increases, making it possible to suppress the dragging movement of the supply pipe 17a.

[0081] On the other hand, if a force is applied in the direction (+x direction) pushing the supply pipe 17a from the pressurized position P, the contact force between the side portion of the second pipe limiting part 162a and the supply pipe 17a will increase. Therefore, the frictional force resisting the thrust increases, making it possible to suppress the pushing movement of the supply pipe 17a.

[0082] As described above, the direction of the contact force between the supply pipe 17a and the pipe limiting member, generated by the pipe reaction force, is approximately orthogonal to the direction in which the supply pipe 17a extends from the pressurized position P. Therefore, even when a force occurs that drags or pushes the supply pipe 17a, the reduction in the contact force between the supply pipe 17a and the pipe limiting member is small. Consequently, the reduction in frictional force can be suppressed, and pipe movement can be reduced.

[0083] Meanwhile, the opposing portion 169c is configured to block the extension direction (z-direction in this portion) of the supply pipe 17a, which is bent due to the first pipe limiting portion 169b and the second pipe limiting portion 162a. In this way, even if the supply pipe 17a is pushed towards the opposing portion 169c, the frictional force increases with the increase of the contact force between the supply pipe 17a and the opposing portion 169c, thereby reducing pipe movement.

[0084] Furthermore, during the operation of closing the supply pipe 17a, the pipe presses against the contact portion of the pipe support 169d, thereby increasing the contact force and friction. This, in turn, suppresses movement of the supply pipe 17a.

[0085] As described above, when the supply pipe 17a is pulled toward the pressurized position P or when the supply pipe 17a is pushed from the pressurized position P, the movement of the pipe can be suppressed.

[0086] In the arrangement path of the supply pipe 17a, it is preferable to set the areas of the first pipe limiting portion 169b, the pipe support portion 169d, and the second pipe limiting portion 162a that contact the supply pipe 17a and thus cause the supply pipe 17a to bend in an arc shape. Since the supply pipe 17a bends along the arc shape and thus restricts the path, the contact area is effectively increased, thereby enhancing the effect of suppressing pipe movement.

[0087] In this embodiment, the first gap W1 is formed to a width such that the S-shaped supply tube 17a contacts the tube restraint portion using the tube's reaction force. Here, the first gap W1 can be set to be smaller than the outer diameter of the supply tube 17a to the point that it does not flatten its inner diameter. By partially clamping the supply tube 17a using the first gap W1, frictional force to be applied between the supply tube 17a and the tube restraint portions 162a and 169b can be reliably applied while suppressing tube movement.

[0088] In this embodiment, the second gap W2 is formed with a width such that the supply tube 17a contacts the opposing portion 169c using the tube's reaction force. Here, the second gap W2 can be set to be smaller than the outer diameter of the supply tube 17a to the point that it does not flatten its inner diameter. By partially clamping the supply tube 17a using the second gap W2, it is possible to reliably apply frictional force between the supply tube 17a and the tube restraint portions 162a and 169b while suppressing tube movement.

[0089] The opening / closing valve mechanism 160 of this embodiment is configured to open and close the supply pipe 17 by contacting the pivotally movable displacement member 164 with the receiving member 163. However, it is possible to suppress pipe movement along its extension direction without being limited to this configuration. Specifically, the opening / closing valve mechanism that closes the pipe by linear movement can also suppress pipe movement along its extension direction by employing the above-described configuration of the cover member 162 and the retaining member 169.

[0090] Meanwhile, the supply pipe 17a passing through the second gap W2 is arranged via the auxiliary contact surface 162b in the opposite direction to the side near the opposing portion 169c, so as to reduce the radius of curvature of the bent portion of the supply pipe 17a. Therefore, by increasing the contact force between the supply pipe 17a and the pipe limiting portion generated by the pipe reaction force, the movement of the pipe can be further suppressed. The auxiliary contact surface 162b is formed with an arc-shaped curved surface having a radius of curvature that prevents the portion of the supply pipe 17a surrounding the second pipe limiting portion 162a from buckling. In addition, the supply pipe 17a is arranged on the upper part of the cover member 162 such that its movement in the x-direction is limited by the third pipe limiting portion 162d.

[0091] As described above, according to this embodiment, the displacement member 164, configured to pressurize the pipe, can pressurize the pipe parallel to its width when pressurizing a pipe with a large diameter or when pressurizing multiple pipes as a whole. In other words, the displacement member 164 is configured to pivot about a first pivot axis 164c, and the receiving member 163 for holding the supply pipe 17a is also configured to pivot about second pivot axes 163e and 163h. Furthermore, the extension direction of the pivot axes is configured to extend along an intersecting direction (the width direction of the pipe) that intersects the extension direction of the pipe. Therefore, even when pressurizing the pipe as a whole, for example, the tilt of the displacement member 164 and the receiving member 163 in the width direction of the pipe can be reduced, regardless of the pipe's outer diameter, thickness, or the size of the assembly. As a result, leakage can be suppressed when the pipe is pressurized.

[0092] Furthermore, in this embodiment, even when the supply pipe 17 receives a force along its extension direction at the pressurized position due to the opening and closing operation of the on / off valve mechanism 160, the pipe path is restricted, and a frictional force resisting this force is stably generated. Therefore, even when the opening and closing operation is performed by the on / off valve mechanism 160, movement of the supply pipe 17 can be suppressed.

[0093] <<Other Implementation Methods>>

[0094] The above embodiment has explained an example of pressurizing the supply pipe 17 by the shifting member 164. However, this embodiment is applicable to any other form, as long as the flow path is closed by pressurizing the pipe using the pressurizing part. For example, the present invention is also applicable to the form of pressurizing a pipe connected to a pump to be used during recovery operation using the pressurizing part. In other words, the valve mechanism described in this embodiment is applicable to various flow path pipes.

[0095] Meanwhile, the above embodiments have already explained examples of printing devices that use ink for printing. Alternatively, the present invention can be applied to flow path opening and closing devices used for opening and closing flow paths of circulating liquids or gases, which include the above-described opening and closing valve mechanism. Of course, the present invention is applicable to printing devices that include this flow path opening and closing device (flow path opening and closing mechanism).

[0096] Meanwhile, the above embodiments have explained an example of the receiving member 163 being subjected to a force applied by the force-applying member 170 in a direction close to the shifting member 164. However, the present invention is not limited to this example. By constructing one of the receiving member 163 and the shifting member 164 to be subjected to a force in a direction close to each other, the same effect as the above embodiments can be obtained. In other words, the shifting member 164 does not necessarily have to be subjected to a force applied by the force-applying member (not shown) in a direction toward the cam 165, but the shifting member 164 can alternatively be subjected to a force applied by other force-applying members (not shown) in a direction close to the receiving member 163. In this case, as described above, the shifting member 164 can move to a position where the tube is pressurized by the cam 165 and the tube is closed, and to a position away from the tube and the tube is open. In this example, the receiving member 163 can also be subjected to a force applied by the force-applying member 170 in a direction close to the shifting member 164. Optionally, the receiving member 163 can be fixed to the retaining member 169.

[0097] Furthermore, the above embodiments have explained an example of setting a pipe configuration path using the retaining member 169 and the cover member 162. Instead of using separate members, a similar pipe configuration path can be set using a single member. The above embodiments have also explained an example where multiple pipes are provided, and the pipe limiting portions protrude from mutually opposite directions in the height direction. However, the invention is not limited to this configuration. For example, when the number of pipes is small, the pipe limiting portions may have a shape that protrudes from mutually opposite directions in the width direction, intersecting (e.g., orthogonal) to the extension direction of the pipes.

[0098] Although the invention has been described with reference to exemplary embodiments, it should be understood that the invention is not limited to the disclosed exemplary embodiments. The scope of the claims should be accorded the broadest interpretation to include all such variations, equivalent structures, and functions.

Claims

1. A printing apparatus comprising: a first tube configured to form a flow path for supplying a liquid to a liquid ejection unit configured to eject the liquid; a second tube configured to form a flow path for supplying a liquid to the liquid ejection unit, different from the flow path formed by the first tube; a holding unit configured to hold the first tube and the second tube, the holding unit being configured to pivot by an independent pivot axis for each tube; and a valve unit configured to move to a closed position in which the valve unit pressurizes and occludes the first tube and the second tube held by the holding unit using a first pressurizing portion and a second pressurizing portion, respectively, and an open position in which the valve unit opens the first tube and the second tube held by the holding unit, characterized in that the valve unit includes a pivot axis around which the valve unit is pivotally moved to move to the closed position and the open position, an extending direction of the pivot axis is a direction intersecting an extending direction of the first tube and the second tube held by the holding unit, and a distance between the pivot axis and the first pressurizing portion in a first direction intersecting the extending direction of the pivot axis is smaller than a distance between the pivot axis and the second pressurizing portion.

2. The printing apparatus according to claim 1, wherein the valve unit is configured to integrally occlude the first tube and the second tube at the closed position.

3. The printing apparatus according to claim 1, further comprising: a force applying unit configured to apply a force in such a manner that either one of the valve unit and the holding unit is relatively close to the other, wherein the holding unit is provided for each of the tubes, and the force applying unit is provided for each of the holding units in such a manner that the force is applied so that the holding unit is relatively close to the valve unit.

4. The printing apparatus according to claim 1, wherein the holding unit includes a first contact portion located at a position opposite to the first pressurizing portion at the closed position and configured to contact the first tube, and a second contact portion located at a position opposite to the second pressurizing portion at the closed position and configured to contact the second tube, and the pivot axis of the valve unit is located at a position substantially equal in height to the first contact portion and the second contact portion of the holding unit.

5. The printing apparatus according to claim 1, wherein the holding unit includes an auxiliary support portion configured to restrict movement of the tube in a width direction, the auxiliary support portion is provided for each of the tubes, the auxiliary support portion is provided at a position capable of contacting the valve unit in a case where the valve unit is located at the closed position, and in a state where the valve unit is located at the closed position, the first pressurizing portion and the second pressurizing portion pressurize the first tube and the second tube, respectively, and a gap is formed between the valve unit and the auxiliary support portion. ​ 6. The printing device according to claim 5, wherein, The auxiliary support portion does not oppose the first pressurizing portion and the second pressurizing portion in a state where the valve unit is located at the closed position.

7. The printing device according to any one of claims 1 to 6, wherein, The second tube has a thickness greater than a thickness of the first tube.

8. The printing device according to any one of claims 1 to 6, wherein, The second tube has an outer diameter greater than an outer diameter of the first tube.

9. The printing device according to any one of claims 1 to 6, wherein, A liquid flowing through a flow path formed by the first tube is different from a liquid flowing through a flow path formed by the second tube.

10. A printing apparatus comprising: a first tube configured to form a flow path for supplying a liquid to a liquid ejection unit configured to eject the liquid; a second tube configured to form a flow path for supplying a liquid to the liquid ejection unit different from the flow path formed by the first tube; a holding unit configured to hold the first tube and the second tube; a valve unit configured to move to a closed position and an open position, in the closed position, the valve unit pressurizes and occludes the first tube and the second tube held by the holding unit using a first pressurizing portion and a second pressurizing portion, respectively, in the open position, the valve unit opens the first tube and the second tube held by the holding unit, characterized in that the valve unit includes a pivot shaft for pivotally moving therearound to move to the closed position and the open position, an extending direction of the pivot shaft is a direction intersecting an extending direction of the first tube and the second tube held by the holding unit, a liquid flowing through a flow path formed by the first tube is different from a liquid flowing through a flow path formed by the second tube, and a distance between the pivot shaft and the first pressurizing portion in a first direction intersecting the extending direction of the pivot shaft is smaller than a distance between the pivot shaft and the second pressurizing portion.

11. The printing apparatus according to claim 10, wherein the valve unit is configured to integrally occlude the first tube and the second tube at the closed position.

12. The printing apparatus according to claim 10, further comprising: a force applying unit configured to apply a force in such a manner that either one of the valve unit and the holding unit relatively approaches the other, wherein the holding unit is provided for each of the tubes, and the force applying unit is provided for each of the holding units in such a manner that the force is applied so that the holding unit relatively approaches the valve unit.

13. The printing apparatus according to claim 10, wherein the holding unit includes a first contact portion located at a position opposite to the first pressurizing portion at the closed position and configured to contact the first tube, and a second contact portion located at a position opposite to the second pressurizing portion at the closed position and configured to contact the second tube, and the pivot shaft of the valve unit is located at a position substantially equal in height to the first contact portion and the second contact portion of the holding unit.

14. The printing apparatus according to claim 10, wherein the holding unit includes an auxiliary support portion configured to restrict movement of the tube in a width direction, ​ The auxiliary support portion is provided at a position capable of contacting the valve unit in a case where the valve unit is located at the closed position, and The auxiliary support portion is provided at a position capable of contacting the valve unit in a case where the valve unit is located at the closed position, and In a state where the valve unit is located at the closed position, the first pressurizing portion and the second pressurizing portion pressurize the first pipe and the second pipe, respectively, and a gap is formed between the valve unit and the auxiliary support portion.

15. The printing device of claim 14, wherein, In a state where the valve unit is located at the closed position, the auxiliary support portion is not opposed to the first pressurizing portion and the second pressurizing portion.

16. The printing device according to any one of claims 10 to 15, wherein, The second pipe has a thickness greater than that of the first pipe.

17. The printing device according to any one of claims 10 to 15, wherein, The second pipe has an outer diameter greater than that of the first pipe.

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