Liquid ejecting apparatus

Abstract

The invention provides a liquid ejecting apparatus which can easily adjust the supply amount of cleaning liquid. A liquid discharge device (1) is characterized by being provided with: a conveyor belt (33) that conveys a fabric (P) and has an outer peripheral surface (33a) on which the fabric (P) can be placed; an ejection unit (61) that ejects a liquid onto the fabric (P) that is placed on the outer peripheral surface (33a) and that is conveyed; a cleaning unit (101) that cleans the outer peripheral surface (33a); a cleaning liquid tank (103) for storing a cleaning liquid for immersing a part of the cleaning unit (101); a supply unit (105) that supplies the cleaning liquid to the cleaning liquid tank (103) and has an opening / closing unit (105b) that is switched between an open state in which the cleaning liquid is supplied and a closed state in which the cleaning liquid is not supplied with respect to the cleaning liquid tank (103); and a control unit (5) that controls the opening / closing unit (105b) so as to adjust the amount of cleaning liquid supplied from the supply unit (105) to the cleaning liquid tank (103).

Description

Technical Field

[0001] This invention relates to a liquid ejection device. Background Technology

[0002] Previously, liquid ejection devices were known for spraying liquid onto media such as paper and cloth to perform printing. In such liquid ejection devices, there is a structure that transports the medium via a conveyor belt. For example, Patent Document 1 discloses a recording device that includes a seamless belt for transporting the recording medium and a belt cleaning device for cleaning the seamless belt.

[0003] However, the device described in Patent Document 1 has the problem of difficulty in adjusting the amount of cleaning fluid supplied to the cleaning fluid reservoir. Specifically, the cleaning fluid is supplied from the cleaning fluid supply unit to the cleaning fluid reservoir. In this device, the adjustment of the cleaning fluid supply amount is not explicitly stated. If the user adjusts the supply amount by opening and closing a manual valve, it is easy for the supply amount to be excessive or insufficient. Furthermore, it is difficult to set and reproduce a suitable supply amount based on the device's operating conditions. Therefore, a liquid dispensing device that makes it easier to adjust the cleaning fluid supply amount is needed.

[0004] Patent Document 1: Japanese Patent Application Publication No. 2014-136625 Summary of the Invention

[0005] The liquid ejection device is characterized by comprising: a conveyor belt for conveying a medium and having an outer peripheral surface capable of holding the medium; an ejection section for ejecting liquid onto the medium being conveyed and placed on the outer peripheral surface; a cleaning section for cleaning the outer peripheral surface; a cleaning liquid tank for storing cleaning liquid used to immerse a portion of the cleaning section; a supply section for supplying the cleaning liquid to the cleaning liquid tank and having an opening and closing section that is switched between an open state supplying the cleaning liquid to the cleaning liquid tank and a closed state not supplying the cleaning liquid to the cleaning liquid tank; and a control section for controlling the opening and closing section to adjust the supply amount of the cleaning liquid from the supply section to the cleaning liquid tank. Attached Figure Description

[0006] Figure 1 This is a schematic diagram illustrating the structure of the liquid ejection device according to the first embodiment.

[0007] Figure 2 This is a schematic diagram illustrating the structure with a cleaning mechanism.

[0008] Figure 3 This is a schematic diagram illustrating an example of an operation panel display.

[0009] Figure 4 This is a schematic diagram illustrating an example of an operation panel display.

[0010] Figure 5 This is a schematic diagram illustrating an example of an operation panel display.

[0011] Figure 6 This is a schematic diagram illustrating an example of an operation panel display.

[0012] Figure 7 This is a schematic diagram illustrating an example of an operation panel display.

[0013] Figure 8 This is a schematic diagram illustrating an example of an operation panel display.

[0014] Figure 9 This is a schematic diagram illustrating an example of an operation panel display.

[0015] Figure 10 A graph showing the relationship between the average water supply over time and time.

[0016] Figure 11 This is a schematic diagram illustrating an example of the display of the operation panel according to the second embodiment.

[0017] Figure 12 This is a schematic diagram illustrating an example of an operation panel display.

[0018] Figure 13 This is a schematic diagram illustrating an example of an operation panel display.

[0019] Figure 14 A graph illustrating the relationship between the average water supply over time in the reference example. Detailed Implementation

[0020] In the embodiments described below, a liquid ejection device for digital printing and dyeing of fabrics is illustrated and described with reference to the accompanying drawings. However, the application of the liquid ejection device of the present invention is not limited to printing and dyeing.

[0021] In the following figures, the X, Y, and Z axes are labeled as mutually orthogonal coordinate axes as needed. The direction pointed to by each arrow is designated as the "+" direction, and the direction opposite to the "+" direction is designated as the "-" direction. When the liquid ejection device is installed on a horizontal surface such as a floor, the "-Z" direction becomes the vertical direction. Sometimes the "+Z" direction is referred to as "upper," and the "-Z" direction as "lower." For ease of illustration, the sizes of the components differ from the actual dimensions.

[0022] In the transport path of fabric, which serves as the medium, being unrolled from the raw material roll to be printed and then wound into a roll, the side of the raw material roll is sometimes referred to as the upstream, and the side of the fabric being rolled up is sometimes referred to as the downstream. In addition, the direction in which the fabric is transported from upstream to downstream is defined as the transport direction.

[0023] 1. First Implementation Method

[0024] like Figure 1 As shown, the liquid dispensing device 1 according to this embodiment includes a control unit 5, a medium conveying unit 20, a recording mechanism 60, a drying unit 70, a winding unit 40, an operation panel 80, and a cleaning mechanism 100. The liquid dispensing device 1 also includes a frame (not shown). Each structure of the liquid dispensing device 1 is supported by the frame F.

[0025] The liquid ejection device 1 causes liquids such as ink to adhere to the fabric P, which serves as the medium, thus forming images such as pictures, photographs, text, and patterns on the fabric P, thereby creating printed materials. Figure 1 Unless otherwise specified, the description in the relevant instructions refers to the state observed from the -X direction.

[0026] The control unit 5 is electrically connected to each structure of the liquid ejection device 1 and comprehensively controls the operation of each structure. Although details will be described later, the control unit 5 is particularly responsible for controlling the supply of cleaning fluid to the cleaning mechanism 100.

[0027] The control unit 5 includes hardware such as a CPU (Central Processing Unit), ROM (Read Only Memory), and RAM (Random Access Memory). The control unit 5 executes a predetermined control program via the CPU. The ROM is a non-volatile storage device that stores the control program executed by the CPU and the data processed using the control program. The RAM constitutes the CPU's working area. The CPU expands the control program read from the ROM, etc., into the RAM and executes the expanded control program.

[0028] The operation panel 80 is also electrically connected to the control unit 5. The operation panel 80 displays various information about the user of the liquid dispensing device 1 and receives various operations or settings input by the user. The control unit 5 controls the liquid dispensing device 1 based on the information input to the operation panel 80. In the following description, the user of the liquid dispensing device 1 will be referred to simply as the user.

[0029] The operation panel 80 is supported by a frame F via a component not shown and is positioned above the liquid dispensing device 1 at its +Y end. The user stands in the +Y direction of the liquid dispensing device 1 and makes various inputs while visually observing the operation panel 80. The operation panel 80 may be, for example, a touch-screen LCD. In addition to the LCD, the operation panel 80 may also have physical buttons.

[0030] The media conveying unit 2 includes a media supply unit 10, conveying rollers 21, 22, 23, and 24, a conveying mechanism 30, and a winding unit 40. The media conveying unit 20 conveys the fabric P along a conveying path from upstream to downstream.

[0031] The media supply unit 10 includes a supply shaft 11, a bearing 12, and a rotation drive unit (not shown). The supply shaft 11 is generally cylindrical and holds the core of the fabric roll P. The bearing 12 supports both ends of the supply shaft 11 in a detachable and rotatable manner along the X-axis.

[0032] The rotary drive unit is, for example, an electric motor, which drives the supply shaft 11 to rotate. By rotating the supply shaft 11 and the conveying mechanism 30 described later with rotating rollers 32, the fabric P is unwound from the blank roll and fed downstream.

[0033] Fabric P is conveyed from the medium supply unit 10, passes through the conveyor roller 21, and its conveying direction is changed to approximately the +Y direction by the conveyor roller 22. Fabric P is then transferred from the approximately -Y direction to the conveying mechanism 30.

[0034] Fibers used as raw materials for fabric P can include, for example, natural fibers such as cotton, silk, linen, mohair, wool, and cashmere; regenerated fibers such as rayon and cupro; and synthetic fibers such as nylon, polyester, and polyurethane, which are made into single yarns, double yarns, or blends. Fabric P is formed by processing the above fibers into woven or nonwoven fabrics. In order to improve the many properties of products made from printed and dyed fabric P, the fabric P may also be pre-processed.

[0035] The conveying mechanism 30 includes rotating rollers 31 and 32, a conveyor belt 33, and a pressing part 50.

[0036] The conveyor belt 33 is located between the conveyor rollers 22 and 23 and conveys the fabric P. The conveyor belt 33 is a seamless belt and is mounted on an area including a position opposite to the recording mechanism 60 in the vertical direction by means of belt rotating rollers 31 and 32. The conveyor belt 33 has an outer peripheral surface 33a and an inner peripheral surface 33b. The outer peripheral surface 33a and the inner peripheral surface 33b are opposite to each other. The fabric P can be placed on the outer peripheral surface 33a. An adhesive layer (not shown) is provided on the outer peripheral surface 33a.

[0037] The conveyor belt 33 presses the fabric P tightly against the adhesive layer on the outer peripheral surface 33a and conveys it in the conveying direction. The conveyor belt 33 is driven to rotate counterclockwise by rotating rollers 31 and 32. The conveying direction of the fabric P on the conveyor belt 33 is the +Y direction.

[0038] Along the X-axis, the width of the conveyor belt 33 is wider than the width of the fabric P. The direction intersecting the conveying direction is defined as the conveyor belt width direction. In this embodiment, the width direction of the conveyor belt 33 is along the X-axis.

[0039] The rotating rollers 31 and 32 are generally cylindrical rotating components and are paired with each other. The rotating rollers 31 and 32 are each capable of rotating along the X-axis. The rotating rollers 31 and 32 are arranged opposite each other along the Y-axis. The rotating roller 31 is located upstream of the conveying mechanism 30 and is positioned near the +Y direction of the conveying roller 22. The rotating roller 32 is located downstream of the conveying mechanism 30 and is positioned near the -Y direction of the conveying roller 23. A support member for supporting the conveyor belt 33 may also be arranged between the rotating rollers 31 and 32.

[0040] The belt rotating roller 31 is a driven roller that rotates counterclockwise by transmitting the rotation of the belt rotating roller 32 via the conveyor belt 33. The belt rotating roller 31 is supported in a rotatable manner on a roller support (not shown).

[0041] The rotating roller 32 is driven to rotate counterclockwise by a conveyor drive motor (not shown). The conveyor drive motor is controlled by the control unit 5. The rotating roller 32 is supported on the roller support 39 in a rotatable manner.

[0042] The fabric P is transferred from the conveyor roller 22 to the conveyor mechanism 30 and is placed on the outer peripheral surface 33a of the conveyor belt 33 above the rotating roller 31. At this time, the fabric P may not be in close contact with the outer peripheral surface 33a.

[0043] The outer peripheral surface 33a supports the fabric P from below. The inner peripheral surface 33b contacts the belt rotating rollers 31 and 32. The conveyor belt 33 is driven to rotate by the friction between the inner peripheral surface 33b and the belt rotating roller 32. The belt rotating roller 31 is driven to rotate by the friction between the inner peripheral surface 33b and the belt rotating roller 31.

[0044] In the X-axis direction, which is the width of the conveyor belt 33, the width of the adhesive layer on the outer peripheral surface 33a is approximately equal to the width of the conveyor belt 33. The path of the conveyor belt 33 from the belt rotating roller 31 to the belt rotating roller 32 is the conveying path of the fabric P. The path of the conveyor belt 33 turning back at the belt rotating roller 32 to the belt rotating roller 31 is designated as the non-conveyoring path. The outer peripheral surface 33a faces upward in the conveying path and downward in the non-conveyoring path.

[0045] The adhesive layer on the outer peripheral surface 33a holds the fabric P tightly against the surface through adhesive force. The adhesive layer may contain adhesive materials such as silicone resin, acrylic resin, or polyurethane resin. In the conveying path, the fabric P adheres tightly to the outer peripheral surface 33a of the conveyor belt 33 and is conveyed in the +Y direction together with the wrapping of the conveyor belt 33.

[0046] The pressing section 50 is positioned near the rotating roller 31 in the +Y direction. The pressing section 50 includes a pressing roller 51, a pair of support sections 53, a heating section 54, and a pair of drive sections (not shown). The pressing section 50 presses the fabric P tightly against the adhesive layer of the conveyor belt 33.

[0047] The pressing roller 51 is a generally cylindrical rotating component. The axis of rotation of the pressing roller 51 is along the X-axis and it is positioned above the conveyor belt 33. Support portions 53 are respectively disposed at both ends along the X-axis relative to the pressing roller 51. The pressing roller 51 is rotatably supported by a pair of support portions 53. Each pair of support portions 53 is supported by a drive unit. Along the X-axis, the length of the pressing roller 51 is approximately equal to the width of the conveyor belt 33.

[0048] One of the drive units is further positioned in the -X direction relative to the support portion 53 that supports the end of the pressing roller 51 in the -X direction. The other drive unit is further positioned in the +X direction relative to the support portion 53 that supports the end of the pressing roller 51 in the +X direction.

[0049] A pair of drive units, driven by a lifting drive motor (not shown), move vertically while supporting a pair of support units 53. Therefore, the pressing roller 51 can be displaced vertically while being supported by the support units 53. Consequently, the pressing force exerted by the pressing roller 51 on the adhesive layer of the outer peripheral surface 33a is adjusted.

[0050] Although not shown in the diagram, the pair of drive units, supported by the guide members and driven by the motor, also reciprocate along the Y-axis. Therefore, the pressing roller 51, supported by the support units 53, is able to reciprocate along the Y-axis.

[0051] The heating element 54 heats the conveyor belt 33. The heating element 54 is positioned below the conveyor belt 33, relative to the pressing roller 51. The upper surface of the heating element 54 is generally planar and contacts the lower inner circumferential surface 33b of the conveyor belt 33 in the conveying path. The distance of the heating element 54 along the Y-axis is approximately equal to the distance the pressing roller 51 travels back and forth in both the conveying direction and the reverse conveying direction. The distance of the heating element 54 along the X-axis is approximately equal to the width of the conveyor belt 33 along the X-axis.

[0052] The heating element 54 is, for example, an electric heater. Heating by the heating element 54 heats the adhesive layer on the outer peripheral surface 33a of the conveyor belt 33. Heating increases the softness of the adhesive layer, thereby increasing the adhesive force on the fabric P. The heating temperature achieved by the heating element 54 is, for example, 35°C or higher and 60°C or lower on the surface above the heating element 54.

[0053] In the pressing section 50, fabric P is placed on the surface above the heating section 54, with the conveyor belt 33 in between. The heating section 54 heats the conveyor belt 33, and the pressing roller 51 presses the fabric P onto the adhesive layer from above. Simultaneously, the pressing roller 51 rotates and moves back and forth in the +Y and -Y directions. The fabric P and the conveyor belt 33 are held and pressed between the surface above the heating section 54 and the pressing roller 51, with the fabric P in close contact with the outer peripheral surface 33a. The fabric P is conveyed in the +Y direction while in close contact with the conveyor belt 33 via the pressing section 50. Alternatively, the pressing roller 51 can also be used to heat the conveyor belt 33 instead of the heating section 54. Furthermore, the heating section 54 can be omitted.

[0054] The recording mechanism 60 is located at the midpoint of the conveyor belt 33 along the Y-axis, facing the outer peripheral surface 33a and the fabric P in the vertical direction. The recording mechanism 60 performs printing on the fabric P supported on the conveyor belt 33. The recording mechanism 60 includes an inkjet head ejection section 61, a carriage 62, and a guide rail 63.

[0055] The guide rail 63 is a structural component extending along the X-axis and is positioned above the conveyor mechanism 30. The guide rail 63 supports the carriage 62 in a manner that allows it to move along the X-axis. The carriage 62, supported by the guide rail 63, reciprocates along the X-axis via a carriage drive motor (not shown). The ejector 61 is mounted below the carriage 62 and reciprocates along the X-axis relative to the conveyor belt 33 together with the carriage 62.

[0056] The ejector section 61 ejects liquids such as ink and functional liquids onto the fabric P, which is placed on the outer peripheral surface 33a and conveyed, to cause it to adhere. The ejector section 61 has a nozzle surface (not shown) facing downwards. The nozzle surface is opposed to the conveyor belt 33 and the fabric P in the vertical direction. Multiple nozzle rows are arranged on the nozzle surface. Each of the multiple nozzle rows consists of multiple nozzles. Each of the multiple nozzle rows ejects individually various inks and functional liquids of colors such as blue-green, magenta, yellow, and black onto the fabric P. Examples of inks include water-based inks and non-water-based inks. In this embodiment, water-based inks are used.

[0057] In the ejection section 61, a piezoelectric element is used as the drive unit, i.e., the actuator. The drive unit is not limited to this. For example, an electromechanical conversion element that displaces the vibrating plate that acts as the actuator by electrostatic adsorption, or an electrothermal conversion element that uses bubbles generated by heating to eject ink as droplets, can also be used.

[0058] Although the illustration is omitted, ink and functional liquid are supplied from the ink tank to the ejection unit 61 via piping. The ink and functional liquid ejected from the ejection unit 61 adhere to the upward-facing surface of the fabric P.

[0059] While the ejector unit 61 moves back and forth along the X-axis, the fabric P is conveyed in the +Y direction via the conveyor belt 33. At this time, liquid such as ink is applied to the fabric P from the ejector unit 61 at predetermined timings. As a result, the desired image or the like is formed on the fabric P.

[0060] Specifically, the functional liquid is a softener or a pretreatment solution. The spraying of the functional liquid onto the fabric P is timed simultaneously or sequentially with the spraying of the ink.

[0061] Fabric softeners improve the hand feel of printed and dyed fabrics (P) when processing them into clothing and other textile products. There are no particular limitations on the type of softener used; any known softener can be applied. However, if the softener contains cationic components, it may sometimes react with ink components to form aggregates. Therefore, it is preferable to avoid contact and mixing between the softener and the ink.

[0062] The pretreatment solution has the function of causing pigments and other color materials in the ink to condense on the surface of the fabric P, thereby improving the color development of the printed material. There are no particular limitations on the type of pretreatment solution; any known pretreatment agent can be used. Since the pretreatment solution causes the color materials to condense, it is preferable to avoid contact and mixing between the pretreatment solution and the ink, except for its original purpose.

[0063] As functional liquids, other functional liquids besides softeners and pretreatment solutions can also be used. Examples of other functional liquids include coating solutions that improve the abrasion resistance and washability of the printed fabric P, and penetrating solutions that assist in the penetration of ink into the fabric P.

[0064] In the ejection section 61, pre-ejection is performed before the ink and functional liquid are ejected onto the fabric P, and during the intervals between ejections. Pre-ejection is performed to suppress the drying or adhesion of the ink or functional liquid at the gas-liquid interface within each nozzle of the ejection section 61, and to prevent color mixing after cleaning the nozzles. The implementation of pre-ejection is controlled by the control section 5. The timing, time interval, and amount of ink and functional liquid pre-ejected are appropriately set according to the type and characteristics of the ink and functional liquid.

[0065] The printed fabric P is further conveyed in the +Y direction from the position opposite to the recording mechanism 60. Then, the fabric P is peeled off from the conveyor belt 33 approximately above the rotating roller 32 and transferred to the conveyor roller 23 downstream of the rotating roller 32.

[0066] The conveyor belt 33 is turned back from the conveying path to the non-conveying path by the belt rotating roller 32, and moves in the -Y direction with the outer peripheral surface 33a facing downward.

[0067] The belt cleaning mechanism 100 cleans the outer peripheral surface 33a of the conveyor belt 33. The belt cleaning mechanism 100 is positioned below the conveyor belt 33 corresponding to the non-conveying path and is opposite to the outer peripheral surface 33a in the vertical direction.

[0068] Because of the adhesive layer, the fabric P is conveyed while adhering tightly, and pre-spraying is performed, liquids such as ink, as well as dirt such as loose threads and foreign objects from the fabric P, easily adhere to the outer peripheral surface 33a. If the dirt on the outer peripheral surface 33a is significant, it may soil the fabric P when it comes into contact with the unprinted fabric P again after the conveyor belt 33 wraps around it. In addition, the adhesion of the adhesive layer may be reduced due to the dirt on the outer peripheral surface 33a. In contrast, the liquid spraying device 1 cleans the dirt on the outer peripheral surface 33a of the conveyor belt 33 using the belt cleaning mechanism 100. Details of the belt cleaning mechanism 100 will be described later.

[0069] The conveyor roller 23 peels the printed fabric P off the conveyor belt 33. The fabric P peeled off from the conveyor belt 33 is conveyed in a generally +Y direction, and the conveying direction is changed to generally downward by the conveyor roller 23. The conveyor rollers 23 and 24 transfer the fabric P to the take-up section 40.

[0070] A drying section 70 is disposed between conveyor rollers 23 and 24. The drying section 70 dries the ink and functional liquid adhering to the fabric P. The drying section 70 includes, for example, an infrared heater. The infrared rays emitted by the infrared heater cause the volatile components contained in the ink and functional liquid adhering to the fabric P to evaporate. As a result, the droplets of ink and functional liquid are dried, and the fabric P can then be wound onto the winding section 40. The fabric P moves towards the winding section 40 via the conveyor rollers 24.

[0071] The take-up section 40 is located downstream and below the conveyor roller 24. The take-up section 40 recovers the printed fabric P, i.e., the printed material. The take-up section 40 includes a take-up shaft section 41, a bearing section 42, and a rotary drive section (not shown). The take-up shaft section 41 is generally cylindrical and winds the printed material into a roll. The bearing section 42 rotatably supports both ends of the take-up shaft section 41 along the X-axis. Furthermore, the take-up shaft section 41 can be detached from the bearing section 42. The rotary drive section rotates the take-up shaft section 41 counterclockwise. By rotating the take-up shaft section 41, the printed material is wound up. Thus, the printed material is produced by the liquid ejection device 1.

[0072] like Figure 2 As shown, the belt cleaning mechanism 100 includes a cleaning section 101, a cleaning fluid tank 103, a supply section 105, a dispensing section 107, a discharge section 109, a wiping section 111, and a cleaning section 113. As described above, the belt cleaning mechanism 100 cleans and removes dirt adhering to the outer peripheral surface 33a of the conveyor belt 33. Furthermore, in Figure 2 In the diagram, a dashed line represents the conveyor belt 33 that is not in the conveying path. In the non-conveying path, the conveyor belt 33 moves in the -Y direction.

[0073] The cleaning section 101, the wiping section 111, and the wiping section 113 are positioned to abut against the outer peripheral surface 33a of the conveyor belt 33 and are arranged in the order described above, facing the -Y direction. Therefore, the outer peripheral surface 33a of the conveyor belt 33 slides over these structures in the order of the cleaning section 101, the wiping section 111, and the wiping section 113.

[0074] The cleaning fluid tank 103 is shaped like a bathtub with an open top, and stores cleaning fluid for cleaning the outer peripheral surface 33a. The cleaning fluid tank 103 is located below the cleaning section 101. The cleaning fluid accumulates at the bottom of the cleaning fluid tank 103. A portion of the cleaning section 101 is immersed in the cleaning fluid stored in the cleaning fluid tank 103. In the X-axis direction, the width of the cleaning fluid tank 103 is larger than the width of the cleaning section 101.

[0075] The cleaning fluid is selected based on the type of ink or functional liquid used in the liquid dispensing device 1. For example, water-soluble solvents such as water and ethanol are used as the cleaning fluid. Additives such as surfactants and defoamers may also be included in the cleaning fluid. The cleaning fluid is supplied to the liquid dispensing device 1 from a supply source not shown, such as a tap water pipe or a cleaning fluid tank. In this embodiment, tap water is used as the cleaning fluid.

[0076] The supply unit 105 supplies cleaning fluid to the cleaning fluid tank 103. The supply unit 105 includes a piping 105a, an on / off section 105b, and a supply pipe 105c, and is attached to the cleaning fluid tank 103 in the +Y direction. The cleaning fluid is introduced into the supply unit 105 from the piping 105a, and supplied to the cleaning fluid tank 103 from the supply pipe 105c via the on / off section 105b.

[0077] Pipe 105a connects the supply source of cleaning fluid to the switch 105b. Pipe 105a is connected to a tap water faucet, for example, via a flexible hose. The interior of pipe 105a is in communication with the interior of switch 105b. Cleaning fluid is introduced from pipe 105a to switch 105b.

[0078] The opening / closing unit 105b changes the amount of cleaning fluid supplied to the cleaning fluid tank 103. The opening / closing unit 105b is switched between an open state (supplying cleaning fluid to the cleaning fluid tank 103) and a closed state (not supplying cleaning fluid to the cleaning fluid tank 103). The control unit 5 controls the opening / closing unit 105b to adjust the amount of cleaning fluid supplied from the supply unit 105 to the cleaning fluid tank 103.

[0079] The flow path (not shown) of the opening / closing section 105b is fully open in the open state and fully closed in the closed state. The degree of openness of the flow path in the opening / closing section 105b is defined as the opening degree. The opening degree is 100% in the open state and 0% in the closed state. Besides 0% and 100%, the opening degree can be arbitrarily adjusted within a range greater than 0% and less than 100%. For the opening / closing section 105b, a known valve mechanism such as a solenoid valve can be used, for example.

[0080] The supply pipe 105c connects the opening / closing part 105b to the cleaning fluid tank 103. The supply pipe 105c connects to the +Y direction sidewall of the cleaning fluid tank 103 and communicates with the flow channel of the opening / closing part 105b and the inner side of the cleaning fluid tank 103. The cleaning fluid supplied from the supply pipe 105c accumulates at the bottom of the cleaning fluid tank 103 along the aforementioned sidewall. However, the arrangement of the supply part 105 is not limited to the above-described manner.

[0081] The regulating section 107 regulates the level Lv of the cleaning fluid stored in the cleaning fluid tank 103. The regulating section 107 is located at the bottom of the cleaning fluid tank 103 in the -Y direction. The regulating section 107 is a plate-shaped partition. The regulating section 107 protrudes upward from the bottom of the cleaning fluid tank 103 along the XZ plane. The cleaning fluid is stored in the area defined by the side walls and bottom of the cleaning fluid tank 103 and the regulating section 107. Figure 2 In the middle, the above area is set as a diagonal shaded area. When from Figure 2 When the cleaning fluid is further supplied in the state shown, the cleaning fluid will overflow in the -Y direction beyond the designated section 107. The overflowed cleaning fluid is discharged from the discharge section 109 out of the cleaning fluid tank 103.

[0082] Since the level Lv of the cleaning fluid stored in the cleaning fluid tank 103, i.e., the upper limit of the liquid surface, is specified by the regulating section 107, it is possible to prevent the cleaning fluid above the necessary level from being stored in the cleaning fluid tank 103. In addition, by supplying cleaning fluid to the cleaning fluid tank 103 to cause the cleaning fluid to overflow, the cleanliness of the stored cleaning fluid can be maintained.

[0083] The cleaning unit 101 cleans the outer peripheral surface 33a of the conveyor belt 33. The cleaning unit 101 is a generally cylindrical brush with its central axis along the X-axis. Although not shown in the figure, the cleaning unit 101 is supported by a support member and rotates counterclockwise on the aforementioned central axis by a drive motor.

[0084] As the cleaning section 101 rotates, it contacts the outer peripheral surface 33a, thereby cleaning away dirt such as ink. Additionally, dried ink residue that was not completely scraped off by the cleaning section 101 comes into contact with the cleaning fluid removed from the cleaning section 101 and is easily scraped off due to the presence of the cleaning fluid. Then, the dried residue is scraped off by the wiping section 111 at the rear of the cleaning section 101. After sliding past the outer peripheral surface 33a, the cleaning section 101 rotates and is immersed in the cleaning fluid, thereby transferring the dirt wiped off the outer peripheral surface 33a into the cleaning fluid and making it clean.

[0085] Here, when the supply of cleaning fluid to the cleaning fluid tank 103 is insufficient, the concentration of ink and the content of foreign matter in the stored cleaning fluid will increase. Consequently, the cleanliness of the cleaning section 101 will decrease, resulting in a situation where the cleaning ability to scrape off dirt from the outer peripheral surface 33a cannot be guaranteed. Furthermore, when the supply of cleaning fluid is excessive, the amount of cleaning fluid discharged from the discharge section 109 will increase, resulting in waste of cleaning fluid. In contrast, the liquid ejection device 1 is a device that regulates the supply amount to suppress excessive or insufficient cleaning fluid.

[0086] The wiping section 111 scrapes off the adhering cleaning fluid, dried matter, etc., from the outer peripheral surface 33a that contacts the cleaning section 101. The wiping section 111 is a roughly plate-shaped rubber component. The cleaning fluid and dried matter scraped off from the outer peripheral surface 33a fall downwards and are discharged from the discharge section 109.

[0087] The wiping section 113 sucks up and removes cleaning fluid and other residues remaining on the outer peripheral surface 33a. The wiping section 113 is a generally cylindrical sponge component with its central axis along the X-axis. The width of the wiping section 113 is shorter than the width of the outer peripheral surface 33a in the X-axis direction. When viewed from above, the wiping sections 113 are arranged offset from each other. The wiping section 113 rotates counterclockwise by an electric motor (not shown). As the outer peripheral surface 33a passes over the wiping section 113, the entire area of ​​the outer peripheral surface 33a in the X-axis direction slides against each wiping section 113.

[0088] The outer peripheral surface 33a of the conveyor belt 33 is cleaned in the above manner. The cleaning of the conveyor belt 33 by the belt cleaning mechanism 100 is performed at least during the period when the printed and dyed material is manufactured by the liquid spraying device 1. In addition to the above-mentioned period, the above-mentioned cleaning can also be performed before or after the manufacture of the printed and dyed material.

[0089] Next, the adjustment of the cleaning fluid supply implemented by control unit 5 will be described. In the following explanation, please also refer to... Figure 1 and Figure 2 .

[0090] The control unit 5 regulates the supply amount of cleaning fluid from the supply unit 105 to the cleaning fluid tank 103 by controlling the time ratio between the open and closed states of the opening / closing unit 105b. Specifically, the time ratio refers to the ratio of the time set to 0% opening to the time set to 100% opening within a fixed period. By changing the time ratio when controlling the opening / closing unit 105b only in the open and closed states, the same adjustment as arbitrarily changing the opening within a range of 0% to 100% within a fixed period can be implemented.

[0091] Specifically, for example, within a fixed period, if half of the period is set to 100% opening and the other half to 0% opening, the total supply for the fixed period is equal to the case where the opening is 50%. Therefore, the supply can be adjusted arbitrarily only in the open and closed states of the opening / closing section 105b. Compared to the case where the opening of the opening / closing section 105b is arbitrarily changed within a range of 0% to 100%, adjusting the supply becomes simpler.

[0092] The control unit 5 controls the time ratio based on the information input to the operation panel 80. Specifically, this information refers to the supply amount, the time ratio, and the average supply of cleaning fluid per unit time. When the user inputs this information into the operation panel 80, the control unit 5 adjusts the time ratio accordingly. Thus, the user can arbitrarily determine the supply amount. Furthermore, in the following explanation, the average supply of cleaning fluid per unit time is referred to as the average water supply per time.

[0093] The control panel 80 displays one or more settings indicating the amount of cleaning fluid supplied. Here, the settings can indicate not only the numerical value of the supply amount but also the quantity supplied. Specifically, for example, as... Figure 3 As shown, the supply can also be expressed as a standard quantity such as "high," "medium," or "low." While not specifically limited, within a fixed period, the system is set to "on" for the entire period when the supply is "high." When the supply is "medium," it is set to "on" for 2 / 3 of the period and "off" for the remaining 1 / 3. When the supply is "low," it is set to "on" for 1 / 2 of the period and "off" for the remaining 1 / 2.

[0094] In addition, such as Figure 4 As shown, the supply can also be displayed as an indicator value with four or more levels depending on the degree.

[0095] The control unit 5 controls and changes the time ratio based on the setting value selected by the user from multiple settings. Therefore, since the user only needs to select the setting value, user convenience is improved.

[0096] The control unit 5 calculates the optimal value for the supply amount of cleaning fluid based on one or more of the following: the type of fabric P used as the medium, the type of liquid such as ink ejected by the ejector unit 61, and the image data formed on the fabric P. The image data mentioned here includes, for example, the amount of liquid ejected from the ejector unit 61, such as printing duty cycle and printing density.

[0097] The control unit 5 displays one or more setpoints on the operation panel 80 based on the calculated optimal value. Specifically, as follows: Figure 5 and Figure 6 As shown, recommended settings among multiple settings can also be marked. Alternatively, settings can be displayed without markings. The type of liquid and image data affect the susceptibility of the outer peripheral surface 33a of the conveyor belt 33 to soiling. Therefore, by displaying appropriate settings corresponding to the degree of soiling, the cleanability of the outer peripheral surface 33a of the conveyor belt 33 and user convenience can be improved.

[0098] Alternatively, the control panel 80 can be configured to allow direct input of one or more values, such as the time ratio and the average supply of cleaning fluid per unit time. The control unit 5 controls the time ratio based on the values ​​input to the control panel 80. This improves user convenience because the user can input any value.

[0099] Specifically, for example, such as Figure 7 As shown, the user inputs the ratio of the on to off states as a time ratio, and the average water supply over time, into the control panel 80. Additionally, as... Figure 8 As shown, you can also select the time ratio and the time-averaged water supply from the drop-down menu. Furthermore, as... Figure 9 As shown, it can also be set to display multiple schemes that record both the time ratio and the average water supply over time, and the user can choose from multiple schemes.

[0100] When the time ratio is selected and a value is input or selected, the control unit 5 controls the opening and closing of the opening and closing unit 105b based on the aforementioned value. At this time, the control unit 5 can also calculate the average water supply over time corresponding to the aforementioned value of the time ratio and display it on the operation panel 80.

[0101] When the time-average water supply is selected and a value is input or selected, the control unit 5 calculates the time ratio for achieving the above value and controls the opening and closing of the opening and closing unit 105b based on the calculated time ratio. At this time, the control unit 5 may also display the calculated time ratio on the operation panel 80.

[0102] Alternatively, the control unit 5 can be configured to store a table showing the correspondence between time ratios and average water supply over time, and retrieve and apply the values ​​from the table without performing calculations. Alternatively, instead of inputting or selecting the value of the time ratio, the control unit can input or select the time set to the on state and the time set to the off state.

[0103] On the operation panel 80, the cycle for controlling the open and closed states can be directly input. Here, "cycle" refers to a fixed period used in calculating time ratios; in other words, it corresponds to the denominator of the average supply per unit time. Therefore, by periodically and repeatedly controlling the opening and closing section 105b based on the content of the image formed on the fabric P, the cleanability of the outer peripheral surface 33a of the conveyor belt 33 and the convenience for the user can be improved. Furthermore, when the cleaning period of the conveyor belt 33 performed by the belt cleaning mechanism 100 is longer than the cycle, the control unit 5 can repeatedly perform control within one cycle.

[0104] Alternatively, the cycle described above can be configured to include a first cycle and a second cycle, and on the operation panel 80, for each of the first and second cycles, one or more values ​​of the time ratio and the average supply per unit time can be directly input. Specifically, during the production of the printed material, the cycle is divided based on the content of the image data, and the opening and closing section 105b is controlled. For example, if the printing density is high during the period corresponding to the first cycle and low during the period corresponding to the second cycle, the supply of cleaning solution is increased during the first cycle and decreased during the second cycle. Therefore, because the supply is set in detail, a more suitable setting for the supply of cleaning solution can be achieved.

[0105] Alternatively, the control unit 5 can be configured to calculate the optimal supply amount of cleaning fluid based on one or more of the following: the type of fabric P, the type of liquid such as ink ejected by the ejector unit 61, and the image data formed on the fabric P. Based on the calculated optimal value, the time ratio is controlled automatically by the control unit 5. This improves user convenience.

[0106] Alternatively, the control unit 5 may determine the cycle of controlling the open and closed states based on one or more of the following: the type of fabric P, the type of liquid such as ink ejected by the ejector unit 61, and the image data formed on the fabric P. Accordingly, since the time ratio is automatically and periodically changed according to printing conditions, the cleanability of the outer peripheral surface 33a of the conveyor belt 33 and the convenience for the user can be further improved.

[0107] Alternatively, the aforementioned cycle can be configured to include a first cycle and a second cycle, with the control unit 5 controlling the time ratio separately for each of the first and second cycles. Accordingly, due to the automatic and detailed settings, the cleanability of the outer peripheral surface 33a of the conveyor belt 33 and the convenience for the user can be further improved.

[0108] Alternatively, the control unit 5 may determine the cycle of controlling the open and closed states based on one or more of the type of fabric P, the type of liquid such as ink ejected by the ejector 61, and the image data formed on the fabric P. Furthermore, based on a predetermined time ratio, during the aforementioned cycle, after executing the first control to set the opening / closing unit 105b to the open state, a second control to set the opening / closing unit 105b to the closed state is executed.

[0109] Specifically, such as Figure 14As shown, during time T, the average water supply is set to 0 during the period from time 0 to time T / 2, meaning the opening / closing unit 105b is in the closed state. Conversely, during the period from time T / 2 to time T, the average water supply is set to U, meaning the opening / closing unit 105b is in the open state. In this case, the supply during the period from time 0 to time T / 2 is 0, the supply during the period from time T / 2 to time T is TU / 2, and the supply during the period from time 0 to time T is TU / 2. If the period for manufacturing the printed and dyed materials, i.e., the period for washing, is shorter than time T, the supply will be lower than TU / 2, potentially leading to insufficient supply of washing liquid.

[0110] In contrast, such as Figure 10 As shown, during the period from time 0 to time T / 2, the opening / closing part 105b is set to the open state as a first control, and during the period from time T / 2 to time T, the opening / closing part 105b is set to the closed state as a second control. Accordingly, since the supply amount of TU / 2 is ensured by the first control, even if the period during which the conveyor belt 33 is cleaned is shorter than time T, insufficient supply will not occur, thereby ensuring the cleanliness of the outer peripheral surface 33a of the conveyor belt 33. Furthermore, the same supply amount as when the opening degree of the opening / closing part 105b is set to 50% can be ensured.

[0111] According to this embodiment, the following effects can be obtained.

[0112] The supply of cleaning fluid can be adjusted more easily. Specifically, since the control unit 5 controls the opening and closing unit 105b, it is less likely to cause excessive or insufficient cleaning fluid, and the user can adjust the supply without expending any effort. In addition, the supply amount desired by the user can be easily set and reproduced based on the operating status of the liquid dispensing device 1.

[0113] 2. Second Implementation Method

[0114] In this embodiment, the method for adjusting the supply of cleaning fluid implemented by the control unit 5 and the opening / closing unit 105b differs from that in the embodiment described above. In this embodiment, the same reference numerals are used for structures common to the first embodiment, and repeated descriptions are omitted.

[0115] In this embodiment, the control unit 5 regulates the supply amount of cleaning fluid from the supply unit 105 to the cleaning fluid tank 103 by controlling the opening degree of the opening / closing unit 105b. That is, in this embodiment, the opening / closing unit 105b is not controlled only at 0% and 100% opening, but the opening degree is arbitrarily changed within a range of 0% to 100%. This differs from the embodiment described above.

[0116] Therefore, since the supply quantity is adjusted by the opening degree of the opening / closing section 105b, the supply quantity can be adjusted more quickly compared to changing the time ratio between the open and closed states. In addition, besides arbitrarily changing the opening degree of the opening / closing section 105b within the range of 0% to 100%, control by the time ratio can also be used.

[0117] The control unit 5 controls the opening degree of the switch 105b based on the information input to the operation panel 80. The aforementioned information refers to the opening degree of the switch 105b and the time-averaged water supply, which is the average supply per unit time.

[0118] The control panel 80 displays one or more set values ​​indicating the supply amount of cleaning fluid. The control unit 5 controls and changes the opening degree based on the set value selected by the user from one or more set values. The set value referred to here is the opening degree and the average supply amount per unit time. Therefore, since the set value is displayed, user convenience is improved compared to the case where the user determines the numerical value of the supply amount.

[0119] The control unit 5 calculates the optimal value for the supply of cleaning fluid based on one or more of the following: the type of fabric P, the type of liquid such as ink ejected by the ejector 61, and the image data formed on the fabric P. Furthermore, the control unit 5 displays one or more set values ​​on the operation panel 80 based on the calculated optimal value. The type of liquid and the image data affect the susceptibility of the outer peripheral surface 33a of the conveyor belt 33 to soiling. Therefore, by displaying appropriate set values ​​corresponding to the degree of soiling, the cleanability of the outer peripheral surface 33a of the conveyor belt 33 and the convenience for the user can be improved.

[0120] Alternatively, the opening degree of the opening / closing section 105b and the average supply amount per unit time can be directly input onto the operation panel 80. The control unit 5 controls the opening degree based on the values ​​input onto the operation panel 80. Therefore, since the user can input any value, user convenience is improved.

[0121] Specifically, such as Figure 11As shown, the user inputs the opening degree or average water supply over time as displayed on the control panel 80. When the user inputs this information onto the control panel 80, the control unit 5 adjusts the opening degree accordingly. Furthermore, as... Figure 12 As shown, it can also be set to allow selection of the opening degree and average water supply over time from a drop-down menu. Furthermore, as... Figure 13 As shown, it can also be set to display multiple schemes that record both the opening degree and the average water supply over time, and allow the user to select from multiple schemes.

[0122] On the operation panel 80, the cycle for controlling the open and closed states can be directly input. The cycle referred to here is the fixed period during which the opening degree is adjusted. Therefore, since the opening degree is controlled periodically and repeatedly based on the content of the image formed on the fabric P, the cleanability of the outer peripheral surface 33a of the conveyor belt 33 and the convenience for the user are improved.

[0123] The aforementioned cycle includes a first cycle and a second cycle. On the operation panel 80, for each of the first and second cycles, one or more values ​​of the opening degree and the average supply per unit time can be directly input. Accordingly, due to the detailed setting of the opening degree, a more suitable supply of cleaning fluid can be set.

[0124] Alternatively, the control unit 5 can be configured to calculate the optimal supply amount of cleaning fluid based on one or more of the following: the type of fabric P, the type of liquid such as ink ejected by the ejector 61, and the image data formed on the fabric P. Based on the calculated optimal value, the opening degree of the opening / closing unit 105b can be controlled. In other words, the opening degree is automatically controlled by the control unit 5. This improves user convenience.

[0125] Alternatively, the control unit 5 may determine the cycle of controlling the opening based on one or more of the following: the type of fabric P, the type of liquid such as ink ejected by the ejector unit 61, and the image data formed on the fabric P. Accordingly, since the opening is automatically and periodically changed according to printing conditions, the cleanability of the outer peripheral surface 33a of the conveyor belt 33 and the convenience for the user can be further improved.

[0126] Alternatively, the aforementioned cycle can be configured to include a first cycle and a second cycle, with the control unit 5 controlling the opening degree of the opening / closing unit 105b individually for each of the first and second cycles. Accordingly, by automatically performing detailed settings, in addition to more appropriately adjusting the supply of cleaning fluid, the cleanability of the outer peripheral surface 33a of the conveyor belt 33 and the convenience for the user can be further improved.

[0127] According to this embodiment, the same effects as those described above can be obtained.

[0128] The following describes the content derived from the implementation method.

[0129] The liquid ejection device is characterized by comprising: a conveyor belt for conveying a medium and having an outer peripheral surface capable of holding the medium; an ejection section for ejecting liquid onto the medium held on the outer peripheral surface and being conveyed; a cleaning section for cleaning the outer peripheral surface; a cleaning liquid tank for storing cleaning liquid used to immerse a portion of the cleaning section; a supply section for supplying cleaning liquid to the cleaning liquid tank and having an opening and closing section that is switched between an open state where cleaning liquid is supplied to the cleaning liquid tank and a closed state where cleaning liquid is not supplied to the cleaning liquid tank; and a control section for controlling the opening and closing section to adjust the supply amount of cleaning liquid from the supply section to the cleaning liquid tank.

[0130] This structure makes it easier to adjust the supply of cleaning fluid. Specifically, since the control unit controls the opening and closing mechanism, it is less likely to cause excessive or insufficient cleaning fluid, and the supply can be adjusted without requiring manual labor. Furthermore, the user's desired supply can be easily set and reproduced based on the operating status of the liquid dispensing device.

[0131] In the aforementioned liquid ejection device, the control unit regulates the amount of cleaning fluid supplied from the supply unit to the cleaning fluid tank by controlling the time ratio between the open and closed states.

[0132] According to this structure, since the supply is adjusted by time control, the control of supply adjustment becomes simpler compared to the case of changing the opening degree of the opening and closing parts.

[0133] In the above-mentioned liquid ejection device, the control unit controls the opening degree of the opening and closing part in the open state, thereby adjusting the supply amount of cleaning liquid from the supply unit to the cleaning liquid tank.

[0134] According to this structure, since the supply is adjusted by the opening degree of the opening and closing parts, the supply can be adjusted quickly compared to changing the time ratio between the open and closed states.

[0135] The liquid ejection device described above has an operation panel, and the control unit controls the time ratio based on the information input to the operation panel.

[0136] Based on this structure, users can determine the supply quantity.

[0137] In the aforementioned liquid dispensing device, the operation panel displays one or more set values ​​indicating the amount of cleaning fluid supplied, and the control unit controls the time ratio based on the set value selected from the set values.

[0138] According to this structure, since the set value is displayed, user convenience is improved compared to situations where the user determines the quantity supplied.

[0139] In the aforementioned liquid ejection device, the control unit calculates the optimal value for the supply of cleaning fluid based on one or more of the type of medium, the type of liquid ejected by the ejection unit, and image data formed on the medium, and displays one or more set values ​​on the operation panel based on the calculated optimal value.

[0140] According to this structure, the type of liquid and image data affect the susceptibility of the conveyor belt's outer surface to dirt. Therefore, since there are appropriate settings corresponding to the degree of dirt, the cleanability of the conveyor belt's outer surface and user convenience can be improved.

[0141] In the aforementioned liquid dispensing device, one or more values, namely the time ratio and the average supply rate per unit time, can be directly input onto the operation panel. The control unit controls the time ratio based on the values ​​input onto the operation panel.

[0142] This structure improves user convenience because users can input any value.

[0143] In the aforementioned liquid ejection device, the cycle for controlling the open and closed states can be directly input on the operation panel.

[0144] According to this structure, since the time ratio and other parameters are periodically changed based on the content of the image formed on the medium, the cleanability of the outer circumference of the conveyor belt and the convenience of the user can be improved.

[0145] In the above-mentioned liquid dispensing device, the cycle includes a first cycle and a second cycle. On the operation panel, for each of the first cycle and the second cycle, one or more of the values ​​of the time ratio and the average supply per unit time can be directly input.

[0146] This structure allows for detailed settings, which further improves the cleanability of the conveyor belt's outer surface and user convenience.

[0147] In the aforementioned liquid ejection device, the control unit calculates the optimal value of the cleaning fluid supply based on one or more of the type of medium, the type of liquid ejected by the ejection unit, and image data formed on the medium, and controls the time ratio based on the calculated optimal value.

[0148] According to this structure, the cleanability of the outer surface and the convenience of the user can be improved by controlling the time ratio according to the printing conditions.

[0149] In the aforementioned liquid ejection device, the cycle of controlling the open and closed states is determined based on one or more of the type of medium, the type of liquid ejected by the ejection unit, and image data formed on the medium.

[0150] According to this structure, since the time ratio and other parameters are automatically and periodically changed according to printing conditions, the cleanability of the outer circumference of the conveyor belt and the convenience of the user can be further improved.

[0151] In the above-mentioned liquid ejection device, the cycle includes a first cycle and a second cycle, and the control unit controls the time ratio separately for each of the first cycle and the second cycle.

[0152] According to this structure, the cleanability of the outer surface of the conveyor belt and the convenience of the user can be further improved due to the automatic and detailed settings.

[0153] In the above-mentioned liquid ejection device, the control unit determines the cycle of controlling the open and closed states based on one or more of the type of medium, the type of liquid ejected by the ejection unit, and image data formed on the medium. Furthermore, based on a predetermined time ratio, during the period of the cycle, after executing the first control to set the opening and closing unit to the open state, the control to set the opening and closing unit to the closed state is executed.

[0154] According to this structure, even when the cycle of changing between the open and closed states is long relative to the time for printing via the liquid ejection device, the cleanliness of the outer circumference of the conveyor belt can be ensured. Specifically, in the above case, assuming the second control is executed first, followed by the first control, the cleaning operation would end abruptly before the cleaning fluid supply is complete. Therefore, there is a possibility that insufficient cleaning fluid could prevent adequate cleaning. In contrast, since the cleaning fluid supply is implemented first, sufficient cleaning is achieved without insufficient cleaning fluid.

[0155] The liquid ejection device described above has a regulating section in the cleaning liquid tank, which regulates the liquid level of the stored cleaning liquid.

[0156] According to this structure, since an upper limit is specified for the liquid level of the cleaning fluid stored in the cleaning fluid tank, it is possible to prevent the storage of cleaning fluid above the necessary level in the cleaning fluid tank.

[0157] The liquid ejection device described above has an operation panel, and the control unit controls the opening degree based on the information input to the operation panel.

[0158] Based on this structure, users can determine the supply quantity.

[0159] In the aforementioned liquid spraying device, the operation panel displays one or more set values ​​indicating the amount of cleaning fluid supplied, and the control unit controls the opening degree based on the set value selected from one or more set values.

[0160] According to this structure, since the set value is displayed, user convenience is improved compared to situations where the user determines the quantity supplied.

[0161] In the aforementioned liquid ejection device, the control unit calculates the optimal value of the cleaning fluid supply based on one or more of the type of medium, the type of liquid ejected by the ejection unit, and image data formed on the medium, and displays the optimal setting value among one or more setting values ​​on the operation panel based on the calculated optimal value.

[0162] According to this structure, the type of liquid and image data affect the susceptibility of the conveyor belt's outer surface to dirt. Therefore, since there are appropriate settings corresponding to the degree of dirt, the cleanability of the conveyor belt's outer surface and user convenience can be improved.

[0163] In the aforementioned liquid ejection device, the opening degree or the average supply amount per unit time can be directly input on the operation panel, and the control unit controls the opening degree based on the value input to the operation panel.

[0164] This structure improves user convenience because users can input any value.

[0165] In the aforementioned liquid ejection device, the cycle for controlling the open and closed states can be directly input on the operation panel.

[0166] According to this structure, since the opening is periodically changed according to the content of the image formed on the medium, the cleanability of the outer circumference of the conveyor belt and the convenience of the user can be improved.

[0167] In the aforementioned liquid ejection device, the cycle includes a first cycle and a second cycle. On the operation panel, for each of the first cycle and the second cycle, one or more values ​​of the opening degree and the average supply per unit time can be directly input.

[0168] This structure allows for detailed settings, which further improves the cleanability of the conveyor belt's outer surface and user convenience.

[0169] In the aforementioned liquid ejection device, the control unit calculates the optimal value of the cleaning fluid supply based on one or more of the type of medium, the type of liquid ejected by the ejection unit, and image data formed on the medium, and controls the opening degree based on the calculated optimal value.

[0170] According to this structure, the openness can be controlled according to the printing conditions, thereby improving the cleanability of the outer circumference of the conveyor belt and the convenience for the user.

[0171] In the aforementioned liquid ejection device, the control unit determines the cycle of the control opening based on one or more of the type of medium, the type of liquid ejected by the ejection unit, and image data formed on the medium.

[0172] According to this structure, the cleanability of the outer circumference of the conveyor belt and the convenience of the user can be further improved because the opening is automatically and periodically changed according to the printing conditions.

[0173] In the above-mentioned liquid ejection device, the cycle includes a first cycle and a second cycle, and the control unit controls the opening degree separately for each of the first cycle and the second cycle.

[0174] According to this structure, since detailed settings are automatically made, in addition to more appropriately adjusting the supply of cleaning fluid, the cleanability of the outer circumference of the conveyor belt and the convenience of the user can be further improved.

[0175] Symbol Explanation

[0176] 1…Liquid ejection device; 5…Control unit; 33…Conveyor belt; 33a…Outer peripheral surface; 61…Ejection unit; 80…Operation panel; 101…Cleaning unit; 103…Cleaning liquid tank; 105…Supply unit; 105b…Opening and closing unit; 107…Prescribing unit; Lv…Liquid level; P…Cloth as medium.

Claims

1. A liquid ejection device, characterized in that, have: A conveyor belt for conveying a medium and having an outer peripheral surface capable of holding the medium. The ejector section ejects liquid onto the medium that is placed on the outer peripheral surface and transported. The cleaning unit cleans the outer peripheral surface; A cleaning solution tank for storing cleaning solution that is used to immerse a portion of the cleaning section; The supply unit supplies the cleaning fluid to the cleaning fluid tank and has an opening and closing part that is switched to an open state for supplying the cleaning fluid to the cleaning fluid tank and a closed state for not supplying the cleaning fluid to the cleaning fluid tank. The control unit controls the opening and closing unit to adjust the supply amount of the cleaning fluid from the supply unit to the cleaning fluid tank.

2. The liquid ejection device as claimed in claim 1, wherein, The control unit regulates the supply amount of cleaning fluid from the supply unit to the cleaning fluid tank by controlling the time ratio between the open state and the closed state.

3. The liquid ejection device as described in claim 1, wherein, The control unit regulates the supply amount of cleaning fluid from the supply unit to the cleaning fluid tank by controlling the opening degree of the opening and closing part in the open state.

4. The liquid ejection device as described in claim 2, wherein, Equipped with an operation panel, The control unit controls the time ratio based on information input to the operation panel.

5. The liquid ejection device as described in claim 4, wherein, The control panel displays one or more set values ​​indicating the supply amount of the cleaning fluid. The control unit controls the time ratio based on a setpoint selected from the setpoints.

6. The liquid ejection device as claimed in claim 5, wherein, The control unit calculates the optimal value of the supply amount of the cleaning fluid based on one or more of the type of the medium, the type of liquid sprayed by the ejector, and image data formed on the medium, and displays one or more of the set values ​​on the operation panel based on the calculated optimal value.

7. The liquid ejection device as claimed in claim 2, wherein, Equipped with an operation panel, On the operation panel, one or more values ​​of the time ratio and the average supply per unit time can be directly entered. The control unit controls the time ratio based on the value input to the operation panel.

8. The liquid ejection device as claimed in claim 7, wherein, On the operation panel, the cycle for controlling the open and closed states can be directly input.

9. The liquid ejection device as claimed in claim 8, wherein, The cycle includes a first cycle and a second cycle. On the operation panel, for each of the first cycle and the second cycle, one or more of the values ​​of the time ratio and the average supply per unit time can be directly entered.

10. The liquid ejection device as claimed in claim 2, wherein, The control unit calculates an optimal value for the supply amount of the cleaning fluid based on one or more of the type of the medium, the type of liquid sprayed by the ejector, and image data formed on the medium, and controls the time ratio based on the calculated optimal value.

11. The liquid ejection device as claimed in claim 10, wherein, The control unit determines the cycle of controlling the open state and the closed state based on one or more of the type of the medium, the type of liquid ejected by the ejector, and the image data formed on the medium.

12. The liquid ejection device as claimed in claim 11, wherein, The cycle includes a first cycle and a second cycle. The control unit controls the time ratio individually for each of the first cycle and the second cycle.

13. The liquid ejection device as claimed in claim 2, wherein, The control unit determines the cycle of controlling the open state and the closed state based on one or more of the type of medium, the type of liquid ejected by the ejector, and image data formed on the medium. Furthermore, based on a predetermined time ratio, during the period of the cycle, after executing the first control to set the open / closed part to the open state, a second control to set the open / closed part to the closed state is executed.

14. The liquid ejection device as claimed in claim 1, wherein, The cleaning fluid tank includes a regulating section that regulates the level of the stored cleaning fluid.

15. The liquid ejection device as claimed in claim 3, wherein, Equipped with an operation panel, The control unit controls the opening degree based on the information input to the operation panel.

16. The liquid ejection device as claimed in claim 15, wherein, The control panel displays one or more set values ​​indicating the supply amount of the cleaning fluid. The control unit controls the opening degree based on a set value selected from one or more of the set values.

17. The liquid ejection device as claimed in claim 16, wherein, The control unit calculates the optimal value of the supply amount of the cleaning fluid based on one or more of the type of the medium, the type of liquid sprayed by the ejector, and image data formed on the medium, and displays the optimal setting value among one or more setting values ​​on the operation panel based on the calculated optimal value.

18. The liquid ejection device as claimed in claim 15, wherein, On the operation panel, the opening degree or the average supply amount per unit time can be directly input. The control unit controls the opening degree based on the value input to the operation panel.

19. The liquid ejection device as claimed in claim 18, wherein, On the operation panel, the cycle for controlling the open and closed states can be directly input.

20. The liquid ejection device as claimed in claim 19, wherein, The cycle includes a first cycle and a second cycle. On the operation panel, for each of the first cycle and the second cycle, one or more of the values ​​of the opening degree and the average supply per unit time can be directly input.

21. The liquid ejection device as claimed in claim 3, wherein, The control unit calculates the optimal value of the supply amount of the cleaning fluid based on one or more of the type of the medium, the type of liquid sprayed by the ejector, and image data formed on the medium, and controls the opening degree based on the calculated optimal value.

22. The liquid ejection device as claimed in claim 21, wherein, The control unit determines the cycle of controlling the opening degree based on one or more of the type of the medium, the type of liquid ejected by the ejector, and the image data formed on the medium.

23. The liquid ejection device as claimed in claim 22, wherein, The cycle includes a first cycle and a second cycle. The control unit controls the opening degree individually for each of the first cycle and the second cycle.

Images